SI4276DY [VISHAY]

Dual N-Channel 30 V (D-S) MOSFET; 双N沟道30 V (D -S )的MOSFET
SI4276DY
型号: SI4276DY
厂家: VISHAY    VISHAY
描述:

Dual N-Channel 30 V (D-S) MOSFET
双N沟道30 V (D -S )的MOSFET

文件: 总15页 (文件大小:304K)
中文:  中文翻译
下载:  下载PDF数据表文档文件
Si4276DY  
Vishay Siliconix  
Dual N-Channel 30 V (D-S) MOSFET  
FEATURES  
PRODUCT SUMMARY  
Halogen-free According to IEC 61249-2-21  
VDS (V)  
RDS(on) (Ω)  
ID (A)a Qg (Typ.)  
Definition  
TrenchFET® Power MOSFET  
100 % Rg Tested  
0.0153 at VGS = 10 V  
0.0184 at VGS = 4.5 V  
0.0280 at VGS = 10 V  
0.0340 at VGS = 4.5 V  
8e  
8e  
Channel 1  
Channel 2  
30  
8.4  
100 % UIS Tested  
8
30  
3.6  
7.1  
Compliant to RoHS Directive 2002/95/EC  
APPLICATIONS  
DC/DC for Notebook PC  
D
1
D
2
SO-8  
S
1
D
1
D
1
D
2
D
2
1
2
3
4
8
7
6
5
G
1
G
G
2
1
S
2
G
2
Top View  
Ordering Information: Si4276DY-T1-GE3 (Lead (Pb)-free and Halogen-free)  
S
S
2
1
N-Channel MOSFET  
N-Channel MOSFET  
ABSOLUTE MAXIMUM RATINGS T = 25 °C, unless otherwise noted  
A
Parameter  
Symbol  
Channel 1  
Channel 2  
Unit  
Drain-Source Voltage  
Gate-Source Voltage  
VDS  
30  
20  
V
VGS  
TC = 25 °C  
TC = 70 °C  
TA = 25 °C  
TA = 70 °C  
8e  
8e  
8b, c, e  
7.6b, c  
50  
8
6.4  
Continuous Drain Current (TJ = 150 °C)  
ID  
6.8b, c  
5.5b, c  
30  
A
Pulsed Drain Current (10 µs Pulse Width)  
Source-Drain Current Diode Current  
IDM  
IS  
TC = 25 °C  
TA = 25 °C  
3.0  
1.7b, c  
2.3  
1.7b, c  
Single Pulse Avalanche Current  
Avalanche Energy  
IAS  
20  
10  
L = 0.1 mH  
EAS  
20  
5
mJ  
W
TC = 25 °C  
TC = 70 °C  
TA = 25 °C  
TA = 70 °C  
3.6  
2.8  
2.3  
1.8  
Maximum Power Dissipation  
PD  
2.1b, c  
1.3b, c  
2.0b, c  
1.3b, c  
Operating Junction and Storage Temperature Range  
TJ, Tstg  
- 55 to 150  
°C  
THERMAL RESISTANCE RATINGS  
Channel 1  
Channel 2  
Typical  
Maximum  
Typical  
58  
Maximum  
62.5  
Parameter  
Symbol  
Unit  
Maximum Junction-to-Ambientb, d  
t 10 s  
Steady  
RthJA  
47  
30  
60  
35  
°C/W  
Maximum Junction-to-Foot (Drain)  
RthJF  
38  
45  
Notes:  
a. Based on TC = 25 °C.  
b. Surface mounted on 1" x 1" FR4 board.  
c. t = 10 s.  
d. Maximum under steady state conditions is 107 °C/W (Ch 1) and 110 °C/W (Ch 2).  
e. Package limited.  
Document Number: 66599  
S10-1289-Rev. A, 31-May-10  
www.vishay.com  
1
Si4276DY  
Vishay Siliconix  
SPECIFICATIONS T = 25 °C, unless otherwise noted  
J
Parameter  
Symbol  
Test Conditions  
Min.  
Typ.a  
Max.  
Unit  
Static  
VGS = 0 V, ID = 250 µA  
Ch 1  
Ch 2  
Ch 1  
Ch 2  
Ch 1  
Ch 2  
Ch 1  
Ch 2  
Ch 1  
Ch 2  
Ch 1  
Ch 2  
Ch 1  
Ch 2  
Ch 1  
Ch 2  
Ch 1  
Ch 2  
Ch 1  
Ch 2  
Ch 1  
Ch 2  
30  
30  
Drain-Source Breakdown Voltage  
VDS Temperature Coefficient  
VGS(th) Temperature Coefficient  
Gate Threshold Voltage  
VDS  
ΔVDS/TJ  
ΔVGS(th)/TJ  
VGS(th)  
V
V
GS = 0 V, ID = 250 µA  
ID = 250 µA  
29  
30  
ID = 250 µA  
mV/°C  
ID = 250 µA  
- 5.2  
- 4.4  
ID = 250 µA  
VDS = VGS, ID = 250 µA  
DS = VGS, ID = 250 µA  
1.2  
1.2  
2.5  
2.5  
100  
100  
1
V
V
Gate-Body Leakage  
IGSS  
VDS = 0 V, VGS  
=
20 V  
nA  
VDS = 30 V, VGS = 0 V  
VDS = 30 V, VGS = 0 V  
1
Zero Gate Voltage Drain Current  
On-State Drain Currentb  
IDSS  
ID(on)  
RDS(on)  
gfs  
µA  
A
VDS = 30 V, VGS = 0 V, TJ = 55 °C  
VDS = 30 V, VGS = 0 V, TJ = 55 °C  
VDS = 5 V, VGS = 10 V  
10  
10  
10  
10  
V
DS = 5 V, VGS = 10 V  
VGS = 10 V, ID = 9.5 A  
VGS = 10 V, ID = 6.8 A  
VGS = 4.5 V, ID = 8.7 A  
VGS = 4.5 V, ID = 6.1 A  
VDS = 15 V, ID = 9.5 A  
0.0127  
0.0230  
0.0146  
0.0280  
43  
0.0153  
0.0280  
0.0184  
0.0340  
Drain-Source On-State  
Resistanceb  
Ω
S
Forward Transconductanceb  
Dynamica  
V
DS = 15 V, ID = 6.8 A  
17  
Ch 1  
Ch 2  
Ch 1  
Ch 2  
Ch 1  
Ch 2  
Ch 1  
Ch 2  
Ch 1  
Ch 2  
Ch 1  
Ch 2  
Ch 1  
Ch 2  
Ch 1  
Ch 2  
1000  
366  
215  
82  
Input Capacitance  
Ciss  
Coss  
Crss  
Channel 1  
VDS = 15 V, VGS = 0 V, f = 1 MHz  
Output Capacitance  
pF  
Channel 2  
VDS = 15 V, VGS = 0 V, f = 1 MHz  
85  
Reverse Transfer Capacitance  
45  
V
DS = 15 V, VGS = 10 V, ID = 9.5 A  
DS = 15 V, VGS = 10 V, ID = 6.8 A  
17.2  
7.3  
8.4  
3.6  
3
26  
15  
17  
8
V
Total Gate Charge  
Qg  
Channel 1  
VDS = 15 V, VGS = 4.5 V, ID = 9.5 A  
nC  
Gate-Source Charge  
Gate-Drain Charge  
Gate Resistance  
Qgs  
Qgd  
Rg  
1.1  
2.6  
1.3  
3.1  
2.6  
Channel 2  
VDS = 15 V, VGS = 4.5 V, ID = 6.8 A  
0.6  
0.5  
6.2  
5.2  
f = 1 MHz  
Ω
www.vishay.com  
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Document Number: 66599  
S10-1289-Rev. A, 31-May-10  
Si4276DY  
Vishay Siliconix  
SPECIFICATIONS T = 25 °C, unless otherwise noted  
J
Parameter  
Dynamica  
Symbol  
Test Conditions  
Min.  
Typ.a  
Max.  
Unit  
Ch 1  
Ch 2  
Ch 1  
Ch 2  
Ch 1  
Ch 2  
Ch 1  
Ch 2  
Ch 1  
Ch 2  
Ch 1  
Ch 2  
Ch 1  
Ch 2  
Ch 1  
Ch 2  
8
4
16  
8
Turn-On Delay Time  
Rise Time  
td(on)  
Channel 1  
DD = 15 V, RL = 2 Ω  
ID 7.6 A, VGEN = 10 V, Rg = 1 Ω  
10  
8
20  
16  
30  
20  
14  
14  
21  
16  
20  
20  
27  
20  
14  
14  
V
tr  
20  
11  
7
Channel 2  
VDD = 15 V, RL = 2.7 Ω  
ID 5.5 A, VGEN = 10 V, Rg = 1 Ω  
Turn-Off DelayTime  
Fall Time  
td(off)  
tf  
7
ns  
14  
8
Turn-On Delay Time  
Rise Time  
td(on)  
Channel 1  
DD = 15 V, RL = 2 Ω  
ID 7.6 A, VGEN = 4.5 V, Rg = 1 Ω  
11  
10  
18  
10  
7
V
tr  
Channel 2  
VDD = 15 V, RL = 2.7 Ω  
ID 5.5 A, VGEN = 4.5 V, Rg = 1 Ω  
Turn-Off Delay Time  
Fall Time  
td(off)  
tf  
7
Drain-Source Body Diode Characteristics  
Ch 1  
Ch 2  
Ch 1  
Ch 2  
Ch 1  
Ch 2  
Ch 1  
Ch 2  
Ch 1  
Ch 2  
Ch 1  
Ch 2  
Ch 1  
Ch 2  
3
Continous Source-Drain Diode  
Current  
IS  
TC = 25 °C  
IS = 7.6 A  
2.3  
50  
30  
1.2  
1.2  
30  
20  
20  
12  
A
Pulse Diode Forward Currenta  
Body Diode Voltage  
ISM  
VSD  
trr  
0.82  
0.85  
20  
13  
12  
6
V
I
S = 5.5 A  
Body Diode Reverse Recovery  
Time  
ns  
nC  
Channel 1  
IF = 7.7 A, dI/dt = 100 A/µs, TJ = 25 °C  
Body Diode Reverse Recovery  
Charge  
Qrr  
ta  
11  
7
Channel 2  
IF = 5.5 A, dI/dt = 100 A/µs, TJ = 25 °C  
Reverse Recovery Fall Time  
Reverse Recovery Rise Time  
ns  
9
tb  
6
Notes:  
a. Guaranteed by design, not subject to production testing.  
b. Pulse test; pulse width 300 µs, duty cycle 2 %.  
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation  
of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum  
rating conditions for extended periods may affect device reliability.  
Document Number: 66599  
S10-1289-Rev. A, 31-May-10  
www.vishay.com  
3
Si4276DY  
Vishay Siliconix  
CHANNEL-1 TYPICAL CHARACTERISTICS 25 °C, unless otherwise noted  
50  
40  
30  
20  
10  
0
10  
V
= 10 V thru 4 V  
GS  
8
T
= - 55 °C  
C
6
T
= 25 °C  
C
4
V
= 3 V  
GS  
T
= 125 °C  
C
2
0
0.0  
0.5  
1.0  
1.5  
2.0  
0.0  
0.6  
V
1.2  
1.8  
2.4  
3.0  
V
- Drain-to-Source Voltage (V)  
- Gate-to-Source Voltage (V)  
DS  
GS  
Output Characteristics  
Transfer Characteristics  
0.020  
0.018  
0.016  
0.014  
0.012  
0.010  
1400  
1050  
700  
350  
0
C
iss  
V
= 4.5 V  
GS  
V
= 10 V  
GS  
C
oss  
C
rss  
0
10  
20  
30  
40  
50  
0
6
V
12  
18  
24  
30  
- Drain-to-Source Voltage (V)  
I
- Drain Current (A)  
DS  
D
Capacitance  
On-Resistance vs. Drain Current  
10  
8
1.7  
1.5  
1.3  
1.1  
0.9  
0.7  
I
= 9.5 A  
D
V
= 10 V; I = 9.5 A  
D
GS  
V
= 7.5 V  
DS  
6
V
I
= 4.5 V  
GS  
V
= 15 V  
= 8.7 A  
DS  
D
4
V
9
= 24 V  
DS  
2
0
0
3
6
12  
15  
18  
- 50 - 25  
0
T
25  
50  
75  
100 125 150  
- Junction Temperature (°C)  
Q
g
- Total Gate Charge (nC)  
J
On-Resistance vs. Junction Temperature  
Gate Charge  
www.vishay.com  
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Document Number: 66599  
S10-1289-Rev. A, 31-May-10  
Si4276DY  
Vishay Siliconix  
CHANNEL-1 TYPICAL CHARACTERISTICS 25 °C, unless otherwise noted  
100  
0.030  
0.025  
0.020  
0.015  
0.010  
I
= 9.5 A  
D
T
= 150 °C  
J
T
= 125 °C  
J
10  
T
= 25 °C  
J
1
T
2
= 25 °C  
J
0.1  
0.0  
0
4
6
8
10  
0.3  
SD  
0.6  
0.9  
1.2  
V
- Source-to-Drain Voltage (V)  
V
- Gate-to-Source Voltage (V)  
GS  
Source-Drain Diode Forward Voltage  
On-Resistance vs. Gate-to-Source Voltage  
2.1  
1.8  
1.5  
1.2  
0.9  
100  
80  
I
= 250 μA  
D
60  
40  
20  
0
- 50 - 25  
0
25  
50  
75  
100 125 150  
0.001  
0.01  
0.1  
1
10  
Time (s)  
T
- Temperature (°C)  
J
Single Pulse Power, Junction-to-Ambient  
Threshold Voltage  
100  
Limited by R  
*
DS(on)  
100 μs  
1 ms  
10  
1
10 ms  
100 ms  
1 s  
T
= 25 °C  
A
0.1  
Single Pulse  
10 s  
DC  
BVDSS Limited  
0.01  
0.1  
1
10  
100  
V
- Drain-to-Source Voltage (V)  
DS  
* V  
> minimum V at which R  
is specified  
DS(on)  
GS  
GS  
Safe Operating Area, Junction-to-Ambient  
Document Number: 66599  
S10-1289-Rev. A, 31-May-10  
www.vishay.com  
5
Si4276DY  
Vishay Siliconix  
CHANNEL-1 TYPICAL CHARACTERISTICS 25 °C, unless otherwise noted  
15  
12  
9
6
3
0
Package Limited  
0
25  
50  
75  
100  
125  
150  
T
- Case Temperature (°C)  
C
Current Derating*  
1.5  
1.2  
0.9  
0.6  
0.3  
0.0  
5
4
3
2
1
0
0
25  
50  
75  
100  
125  
150  
0
25  
50  
75  
100  
125  
150  
T
A
- Ambient Temperature (°C)  
T
- Case Temperature (°C)  
C
Power Derating, Junction-to-Ambient  
Power Derating, Junction-to-Foot  
* The power dissipation PD is based on TJ(max) = 150 °C, using junction-to-case thermal resistance, and is more useful in settling the upper  
dissipation limit for cases where additional heatsinking is used. It is used to determine the current rating, when this rating falls below the package  
limit.  
www.vishay.com  
6
Document Number: 66599  
S10-1289-Rev. A, 31-May-10  
Si4276DY  
Vishay Siliconix  
CHANNEL-1 TYPICAL CHARACTERISTICS 25 °C, unless otherwise noted  
2
1
Duty Cycle = 0.5  
0.2  
0.1  
Notes:  
P
DM  
0.1  
t
1
0.05  
t
2
t
t
2
1
1. Duty Cycle, D =  
2. Per Unit Base = R  
= 85 °C/W  
0.02  
thJA  
(t)  
3. T  
-
T
A
= P  
Z
JM  
DM thJA  
4. Surface Mounted  
Single Pulse  
0.01  
-4  
-3  
-2  
-1  
10  
10  
10  
10  
Square Wave Pulse Duration (s)  
Normalized Thermal Transient Impedance, Junction-to-Ambient  
1
10  
100  
600  
2
1
Duty Cycle = 0.5  
0.2  
0.1  
0.1  
0.05  
0.02  
Single Pulse  
0.01  
-4  
-3  
-2  
-1  
10  
10  
10  
10  
1
10  
Square Wave Pulse Duration (s)  
Normalized Thermal Transient Impedance, Junction-to-Foot  
Document Number: 66599  
S10-1289-Rev. A, 31-May-10  
www.vishay.com  
7
Si4276DY  
Vishay Siliconix  
CHANNEL-2 TYPICAL CHARACTERISTICS 25 °C, unless otherwise noted  
30  
24  
18  
12  
6
5
4
3
2
1
0
V
= 10 V thru 4 V  
GS  
T
= - 55 °C  
C
T
= 25 °C  
C
V
= 3 V  
GS  
T
= 125 °C  
C
0
0.0  
0.5  
1.0  
1.5  
2.0  
0.0  
0.6  
V
1.2  
1.8  
2.4  
3.0  
- Gate-to-Source Voltage (V)  
V
- Drain-to-Source Voltage (V)  
GS  
DS  
Output Characteristics  
Transfer Characteristics  
0.060  
0.045  
0.030  
0.015  
0.000  
500  
400  
300  
200  
100  
0
C
iss  
V
= 4.5 V  
GS  
V
= 10 V  
GS  
C
oss  
C
rss  
0
5
10  
15  
20  
25  
30  
0
6
V
12  
18  
24  
30  
I
- Drain Current (A)  
- Drain-to-Source Voltage (V)  
D
DS  
On-Resistance vs. Drain Current  
Capacitance  
10  
8
1.7  
1.5  
1.3  
1.1  
0.9  
0.7  
I
= 6.8 A  
D
V
= 10 V; I = 6.8 A  
D
GS  
V
= 7.5 V  
DS  
6
V
= 4.5 V  
GS  
= 6.1 A  
V
= 15 V  
DS  
I
D
4
V
= 24 V  
DS  
2
0
0
2
4
6
8
- 50 - 25  
0
T
25  
50  
75  
100 125 150  
Q
- Total Gate Charge (nC)  
- Junction Temperature (°C)  
g
J
Gate Charge  
On-Resistance vs. Junction Temperature  
www.vishay.com  
8
Document Number: 66599  
S10-1289-Rev. A, 31-May-10  
Si4276DY  
Vishay Siliconix  
CHANNEL-2 TYPICAL CHARACTERISTICS 25 °C, unless otherwise noted  
100  
0.060  
0.045  
0.030  
0.015  
0
I
= 6.8 A  
D
T
= 125 °C  
J
T
= 150 °C  
J
10  
T
= 25 °C  
J
T
= 25 °C  
J
1
0.1  
0.0  
0
2
V
4
6
8
10  
0.3  
0.6  
0.9  
1.2  
V
- Source-to-Drain Voltage (V)  
- Gate-to-Source Voltage (V)  
SD  
GS  
Source-Drain Diode Forward Voltage  
On-Resistance vs. Gate-to-Source Voltage  
2.1  
1.9  
1.7  
1.5  
1.3  
1.1  
50  
40  
30  
20  
10  
0
I
= 250 μA  
D
- 50 - 25  
0
25  
50  
75  
100 125 150  
0.001  
0.01  
0.1  
1
10  
100  
1000  
Time (s)  
T
- Temperature (°C)  
J
Single Pulse Power, Junction-to-Ambient  
Threshold Voltage  
100  
Limited by R  
*
DS(on)  
10  
100 μs  
1 ms  
1
10 ms  
100 ms  
T
= 25 °C  
0.1  
A
1 s  
10 s  
DC  
Single Pulse  
BVDSS Limited  
0.01  
0.1  
1
10  
100  
V
- Drain-to-Source Voltage (V)  
DS  
* V  
> minimum V at which R  
is specified  
DS(on)  
GS  
GS  
Safe Operating Area, Junction-to-Ambient  
Document Number: 66599  
S10-1289-Rev. A, 31-May-10  
www.vishay.com  
9
Si4276DY  
Vishay Siliconix  
CHANNEL-2 TYPICAL CHARACTERISTICS 25 °C, unless otherwise noted  
10  
8
Package Limited  
6
4
2
0
0
25  
50  
75  
100  
125  
150  
T
- Case Temperature (°C)  
C
Current Derating*  
1.5  
1.2  
0.9  
0.6  
0.3  
0.0  
4
3
2
1
0
0
25  
50  
75  
100  
125  
150  
0
25  
50  
75  
100  
125  
150  
T
A
- Ambient Temperature (°C)  
T
- Case Temperature (°C)  
C
Power Derating, Junction-to-Foot  
Power Derating, Junction-to-Ambient  
* The power dissipation PD is based on TJ(max) = 150 °C, using junction-to-case thermal resistance, and is more useful in settling the upper  
dissipation limit for cases where additional heatsinking is used. It is used to determine the current rating, when this rating falls below the package  
limit.  
www.vishay.com  
10  
Document Number: 66599  
S10-1289-Rev. A, 31-May-10  
Si4276DY  
Vishay Siliconix  
CHANNEL-2 TYPICAL CHARACTERISTICS 25 °C, unless otherwise noted  
1
Duty Cycle = 0.5  
0.2  
Notes:  
0.1  
0.1  
P
DM  
0.05  
0.02  
t
1
t
2
t
1
1. Duty Cycle, D =  
t
2
2. Per Unit Base = R  
= 90 °C/W  
thJA  
(t)  
= P  
Z
3. T - T  
A
DM thJA  
JM  
4. Surface Mounted  
Single Pulse  
0.01  
-4  
-3  
-2  
-1  
10  
10  
10  
10  
Square Wave Pulse Duration (s)  
Normalized Thermal Transient Impedance, Junction-to-Ambient  
1
100  
1000  
10  
1
Duty Cycle = 0.5  
0.2  
0.1  
0.1  
0.05  
0.02  
Single Pulse  
0.01  
-4  
-3  
-2  
-1  
10  
10  
10  
10  
1
10  
Square Wave Pulse Duration (s)  
Normalized Thermal Transient Impedance, Junction-to-Foot  
Vishay Siliconix maintains worldwide manufacturing capability. Products may be manufactured at one of several qualified locations. Reliability data for Silicon  
Technology and Package Reliability represent a composite of all qualified locations. For related documents such as package/tape drawings, part marking, and  
reliability data, see www.vishay.com/ppg?66599.  
Document Number: 66599  
S10-1289-Rev. A, 31-May-10  
www.vishay.com  
11  
Package Information  
Vishay Siliconix  
SOIC (NARROW): 8-LEAD  
JEDEC Part Number: MS-012  
8
6
7
2
5
4
E
H
1
3
S
h x 45  
D
C
0.25 mm (Gage Plane)  
A
All Leads  
0.101 mm  
q
e
B
A
1
L
0.004"  
MILLIMETERS  
Max  
INCHES  
DIM  
A
Min  
Min  
Max  
1.35  
0.10  
0.35  
0.19  
4.80  
3.80  
1.75  
0.20  
0.51  
0.25  
5.00  
4.00  
0.053  
0.004  
0.014  
0.0075  
0.189  
0.150  
0.069  
0.008  
0.020  
0.010  
0.196  
0.157  
A1  
B
C
D
E
e
1.27 BSC  
0.050 BSC  
H
h
5.80  
0.25  
0.50  
0°  
6.20  
0.50  
0.93  
8°  
0.228  
0.010  
0.020  
0°  
0.244  
0.020  
0.037  
8°  
L
q
S
0.44  
0.64  
0.018  
0.026  
ECN: C-06527-Rev. I, 11-Sep-06  
DWG: 5498  
Document Number: 71192  
11-Sep-06  
www.vishay.com  
1
VISHAY SILICONIX  
TrenchFET® Power MOSFETs  
Application Note 808  
Mounting LITTLE FOOT®, SO-8 Power MOSFETs  
Wharton McDaniel  
0.288  
7.3  
Surface-mounted LITTLE FOOT power MOSFETs use  
integrated circuit and small-signal packages which have  
0.050  
1.27  
0.088  
2.25  
been been modified to provide the heat transfer capabilities  
required by power devices. Leadframe materials and  
design, molding compounds, and die attach materials have  
been changed, while the footprint of the packages remains  
the same.  
0.088  
2.25  
0.027  
0.69  
0.078  
1.98  
0.2  
5.07  
See Application Note 826, Recommended Minimum Pad  
Patterns With Outline Drawing Access for Vishay Siliconix  
MOSFETs, (http://www.vishay.com/ppg?72286), for the  
basis of the pad design for a LITTLE FOOT SO-8 power  
MOSFET. In converting this recommended minimum pad  
to the pad set for a power MOSFET, designers must make  
two connections: an electrical connection and a thermal  
connection, to draw heat away from the package.  
Figure 2. Dual MOSFET SO-8 Pad Pattern  
With Copper Spreading  
The minimum recommended pad patterns for the  
single-MOSFET SO-8 with copper spreading (Figure 1) and  
dual-MOSFET SO-8 with copper spreading (Figure 2) show  
the starting point for utilizing the board area available for the  
heat-spreading copper. To create this pattern, a plane of  
copper overlies the drain pins. The copper plane connects  
the drain pins electrically, but more importantly provides  
planar copper to draw heat from the drain leads and start the  
process of spreading the heat so it can be dissipated into the  
ambient air. These patterns use all the available area  
underneath the body for this purpose.  
In the case of the SO-8 package, the thermal connections  
are very simple. Pins 5, 6, 7, and 8 are the drain of the  
MOSFET for a single MOSFET package and are connected  
together. In a dual package, pins 5 and 6 are one drain, and  
pins 7 and 8 are the other drain. For a small-signal device or  
integrated circuit, typical connections would be made with  
traces that are 0.020 inches wide. Since the drain pins serve  
the additional function of providing the thermal connection  
to the package, this level of connection is inadequate. The  
total cross section of the copper may be adequate to carry  
the current required for the application, but it presents a  
large thermal impedance. Also, heat spreads in a circular  
fashion from the heat source. In this case the drain pins are  
the heat sources when looking at heat spread on the PC  
board.  
Since surface-mounted packages are small, and reflow  
soldering is the most common way in which these are  
affixed to the PC board, “thermal” connections from the  
planar copper to the pads have not been used. Even if  
additional planar copper area is used, there should be no  
problems in the soldering process. The actual solder  
connections are defined by the solder mask openings. By  
combining the basic footprint with the copper plane on the  
drain pins, the solder mask generation occurs automatically.  
0.288  
7.3  
0.050  
1.27  
0.196  
5.0  
A final item to keep in mind is the width of the power traces.  
The absolute minimum power trace width must be  
determined by the amount of current it has to carry. For  
thermal reasons, this minimum width should be at least  
0.020 inches. The use of wide traces connected to the drain  
plane provides a low impedance path for heat to move away  
from the device.  
0.027  
0.69  
0.078  
1.98  
0.2  
5.07  
Figure 1. Single MOSFET SO-8 Pad  
Pattern With Copper Spreading  
Document Number: 70740  
Revision: 18-Jun-07  
www.vishay.com  
1
Application Note 826  
Vishay Siliconix  
RECOMMENDED MINIMUM PADS FOR SO-8  
0.172  
(4.369)  
0.028  
(0.711)  
0.022  
0.050  
(0.559)  
(1.270)  
Recommended Minimum Pads  
Dimensions in Inches/(mm)  
Return to Index  
www.vishay.com  
22  
Document Number: 72606  
Revision: 21-Jan-08  
Legal Disclaimer Notice  
Vishay  
Disclaimer  
ALL PRODUCT, PRODUCT SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE WITHOUT NOTICE TO IMPROVE  
RELIABILITY, FUNCTION OR DESIGN OR OTHERWISE.  
Vishay Intertechnology, Inc., its affiliates, agents, and employees, and all persons acting on its or their behalf (collectively,  
“Vishay”), disclaim any and all liability for any errors, inaccuracies or incompleteness contained in any datasheet or in any other  
disclosure relating to any product.  
Vishay makes no warranty, representation or guarantee regarding the suitability of the products for any particular purpose or  
the continuing production of any product. To the maximum extent permitted by applicable law, Vishay disclaims (i) any and all  
liability arising out of the application or use of any product, (ii) any and all liability, including without limitation special,  
consequential or incidental damages, and (iii) any and all implied warranties, including warranties of fitness for particular  
purpose, non-infringement and merchantability.  
Statements regarding the suitability of products for certain types of applications are based on Vishay’s knowledge of typical  
requirements that are often placed on Vishay products in generic applications. Such statements are not binding statements  
about the suitability of products for a particular application. It is the customer’s responsibility to validate that a particular  
product with the properties described in the product specification is suitable for use in a particular application. Parameters  
provided in datasheets and/or specifications may vary in different applications and performance may vary over time. All  
operating parameters, including typical parameters, must be validated for each customer application by the customer’s  
technical experts. Product specifications do not expand or otherwise modify Vishay’s terms and conditions of purchase,  
including but not limited to the warranty expressed therein.  
Except as expressly indicated in writing, Vishay products are not designed for use in medical, life-saving, or life-sustaining  
applications or for any other application in which the failure of the Vishay product could result in personal injury or death.  
Customers using or selling Vishay products not expressly indicated for use in such applications do so at their own risk and agree  
to fully indemnify and hold Vishay and its distributors harmless from and against any and all claims, liabilities, expenses and  
damages arising or resulting in connection with such use or sale, including attorneys fees, even if such claim alleges that Vishay  
or its distributor was negligent regarding the design or manufacture of the part. Please contact authorized Vishay personnel to  
obtain written terms and conditions regarding products designed for such applications.  
No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document or by  
any conduct of Vishay. Product names and markings noted herein may be trademarks of their respective owners.  
Document Number: 91000  
Revision: 11-Mar-11  
www.vishay.com  
1

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