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ASM1235  
Asymmetrical TVS Diode  
Mechanical Characteristics  
Description  
Package: SOT-23  
The ASM1235 is designed for asymmetrical (12V to 35V)  
protection in multi-point data transmission application,  
The ASM1235 replace four discrete components by inte-  
grating two 12V and two 35V TVS diodes in a single  
package. The ASM1235 complies with the IEC 61000-4-2  
(ESD) with ±25kV air and ±20kV contact discharge. It is  
assembled into a lead-free SOT-23 package. It is de-  
signed to protect components which are connected to  
data and transmission lines from voltage surges.  
Lead Finish: Matte Tin  
Case Material: “Green” Molding Compound.  
Terminal Connections: See Diagram Below  
Marking Information: See Below  
Applications  
Wireless System  
Networks  
Features  
Portable Instrumentation  
RS485 Ports  
300W peak pulse power (8/20μs)  
Ultra low leakage: nA level  
Operating voltage: 12V or 35V  
Low clamping voltage  
Marking Information  
Complies with following standards:  
– IEC 61000-4-2 (ESD) immunity test  
Air discharge: ±25kV  
3
Contact discharge: ±20kV  
– IEC61000-4-5 (Lightning) 4A (pin1 or 2 to 3)  
IEC61000-4-5 (Lightning) 11A (pin3 to 1 or 3)  
(8/20μs)  
1235  
1235 = Device Marking Code  
RoHS Compliant  
1
2
Dimensions and Pin Configuration  
Ordering Information  
Part Number  
Packaging  
3000/Tape & Reel  
Reel Size  
ASM1235  
7 inch  
Pin Schematic  
Revision_1.1  
1 of 5  
www.appliedpowermicro.com  
ASM1235  
Absolute Maximum Ratings (TA=25°C unless otherwise specified)  
Parameter  
Symbol  
Value  
Unit  
Peak Pulse Power (8/20µs)  
Ppk  
300  
W
Peak Pulse Current (8/20µs) (Pin 1 or 2 to 3 )  
Peak Pulse Current (8/20µs) (Pin 3 to 1 or 2 )  
Ipp  
Ipp  
4
A
A
11  
ESD per IEC 61000−4−2 (Air)  
±25  
±20  
VESD  
kV  
ESD per IEC 61000−4−2 (Contact)  
Operating Temperature Range  
Storage Temperature Range  
TJ  
−40 to +125  
−55 to +150  
°C  
°C  
Tstg  
Electrical Characteristics (TA=25°C unless otherwise specified)  
Pin 1 or pin 2 Pin 3 to pin 1  
to pin3  
or pin 2  
(35V TVS)  
(12V TVS)  
Parameter  
Symbol Min Typ Max Min Typ Max Unit Test Condition  
Reverse Working Voltage  
Breakdown Voltage  
Reverse Leakage Current  
Clamping Voltage  
VRWM  
VBR  
IR  
35  
12  
V
V
36  
13.3  
IT = 1mA  
0.5  
50  
0.5  
18  
μA VR = VRWM  
VC  
V
V
IPP = 1A  
IPP = 4A (pin1 or pin 2 to pin3)  
IPP = 11A (pin3 to pin1 or pin2)  
Clamping Voltage  
VC  
CJ  
72  
28  
24  
50  
Junction Capacitance  
pF VR = 0V, f = 1MHz  
Revision_1.1  
2 of 5  
www.appliedpowermicro.com  
ASM1235  
Typical Performance Characteristics (TA=25°C unless otherwise Specified)  
Junction Capacitance vs. Reverse Voltage  
Peak Pulse Power vs. Pulse Time  
Clamping Voltage vs. Peak Pulse Current  
Power Derating Curve  
ESD Clamping Voltage  
8 X 20μs Pulse Waveform  
8 kV Contact per IEC61000−4−2  
Revision_1.1  
3 of 5  
www.appliedpowermicro.com  
ASM1235  
SOT-23 Package Outline Drawing  
DIMENSIONS  
MILLIMETERS  
INCHES  
NOM  
- -  
SYM  
MIN  
0.90  
NOM  
MAX  
MIN  
MAX  
A
A1  
A2  
b
- -  
1.15  
0.10  
1.05  
0.50  
0.15  
3.00  
1.40  
0.035  
0.045  
0.00  
0.90  
0.30  
0.08  
2.80  
1.20  
- -  
- -  
- -  
- -  
- -  
- -  
0.000  
0.035  
0.012  
0.003  
0.110  
0.047  
- -  
- -  
- -  
- -  
- -  
- -  
0.004  
0.041  
0.020  
0.006  
0.118  
0.055  
c
D
E
E1  
e
2.25  
- -  
2.55  
0.089  
0.100  
0.95TYP  
0.037TYP  
e1  
L
1.80  
- -  
0.55REF  
- -  
2.00  
0.071  
- -  
0.022REF  
- -  
0.079  
L1  
Θ
0.30  
0.50  
0.012  
0.020  
- -  
- -  
0°  
8°  
0°  
8°  
Revision_1.1  
4 of 5  
www.appliedpowermicro.com  
ASM1235  
Suggested Land Pattern  
DIMENSIONS  
INCHES MILLIMETERS  
SYM  
C
E
0.087  
0.037  
0.075  
0.031  
0.039  
(2.20)  
0.95  
1.90  
0.80  
1.00  
E1  
G
X
Y
Z
0.055  
0.141  
1.40  
3.60  
Contact Information  
Applied Power Microelectronics Inc.  
Website: http://www.appliedpowermicro.com  
Email: sales@appliedpowermicro.com  
Phone: +86 (0519) 8399 3606  
Applied Power Microelectronics Inc. (APM) reserves the right to make changes to the product specification and data in this document without notice. APM makes no warranty, representation or  
guarantee regarding the suitability of its products for any particular purpose, nor does APM assume any liability arising from the application or use of any products or circuits, and specifically dis-  
claims any and all liability, including without limitation special, consequential or incidental damages.  
Revision_1.1  
5 of 5  
www.appliedpowermicro.com