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January 1995  
LM185-1.2/LM285-1.2/LM385-1.2  
Micropower Voltage Reference Diode  
General Description  
b
55 C to  
The LM185-1.2/LM285-1.2/LM385-1.2 are micropower  
2-terminal band-gap voltage regulator diodes. Operating  
over a 10 mA to 20 mA current range, they feature excep-  
tionally low dynamic impedance and good temperature sta-  
bility. On-chip trimming is used to provide tight voltage toler-  
ance. Since the LM185-1.2 band-gap reference uses only  
transistors and resistors, low noise and good long term sta-  
bility result.  
The LM185-1.2 is rated for operation over a  
125 C temperature range while the LM285-1.2 is rated  
§
§
40 C to 85 C and the LM385-1.2 0 C to 70 C. The LM185-  
b
§
§
§
§
1.2/LM285-1.2 are available in a hermetic TO-46 package  
and the LM285-1.2/LM385-1.2 are also available in a low-  
cost TO-92 molded package, as well as S.O. The LM185-  
1.2 is also available in a hermetic leadless chip carrier pack-  
age.  
Careful design of the LM185-1.2 has made the device ex-  
ceptionally tolerant of capacitive loading, making it easy to  
use in almost any reference application. The wide dynamic  
operating range allows its use with widely varying supplies  
with excellent regulation.  
Features  
Y
g
g
4 mV ( 0.3%) max. initial tolerance (A grade)  
Y
Y
Y
Y
Y
Operating current of 10 mA to 20 mA  
0.6X max dynamic impedance (A grade)  
Low temperature coefficient  
The extremely low power drain of the LM185-1.2 makes it  
useful for micropower circuitry. This voltage reference can  
be used to make portable meters, regulators or general pur-  
pose analog circuitry with battery life approaching shelf life.  
Low voltage referenceÐ1.235V  
2.5V device and adjustable device also available  
Ð LM185-2.5 series and LM185 series, respectively  
Further, the wide operating current allows it to replace older  
references with a tighter tolerance part.  
Connection Diagrams  
TO-92  
Plastic Package (Z)  
TO-46  
Metal Can Package (H)  
SO Package  
TL/H/5518–10  
TL/H/5518–6  
Bottom View  
TL/H/5518–9  
Bottom View  
Order Number LM285M-1.2,  
Order Number LM285Z-1.2,  
LM285AZ-1.2, LM285AXZ-1.2,  
LM285AYZ-1.2, LM285BXZ-1.2,  
LM285BYZ-1.2, LM385Z-1.2,  
LM385AZ-1.2, LM385AXZ-1.2,  
LM385AYZ-1.2, LM385BZ-1.2,  
LM385BXZ-1.2 or LM385BYZ-1.2  
See NS Package Number Z03A  
LM285AM-1.2, LM285AXM-1.2,  
LM285AYM-1.2, LM285BXM-1.2,  
LM285BYM-1.2, LM385M-1.2,  
LM385AM-1.2, LM385AXM-1.2,  
LM385AYM-1.2, LM385BM-1.2,  
LM385BXM-1.2 or LM385BYM-1.2  
See NS Package Number M08A  
Order Number LM185H-1.2,  
LM185H-1.2/883, LM185BXH-1.2,  
LM185BYH-1.2/883, LM285H-1.2,  
LM285BXH-1.2 or LM285BYH-1.2  
See NS Package Number H02A  
Typical Application  
Wide Input  
Range Reference  
SO Package  
Alternate Pinout  
Order Number LM385SM-1.2,  
LM385ASM-1.2 or LM385BSM-1.2  
See NS Package Number M08A  
TL/H/5518–11  
TL/H/5518–8  
C
1995 National Semiconductor Corporation  
TL/H/5518  
RRD-B30M115/Printed in U. S. A.  
Absolute Maximum Ratings (Note 1)  
If Military/Aerospace specified devices are required,  
please contact the National Semiconductor Sales  
Office/Distributors for availability and specifications.  
(Note 2)  
b
a
55 C to 150 C  
Storage Temperature  
§
§
Soldering Information  
TO-92 package: 10 sec.  
TO-46 package: 10 sec.  
SO package: Vapor phase (60 sec.)  
Infrared (15 sec.)  
260 C  
§
300 C  
§
Reverse Current  
Forward Current  
Operating Temperature Range (Note 3)  
LM185-1.2  
30 mA  
10 mA  
215 C  
§
220 C  
§
See AN-450 ‘‘Surface Mounting Methods and Their Effect  
on Product Reliability’’ for other methods of soldering sur-  
face mount devices.  
b
a
55 C to 125 C  
§
40 C to 85 C  
§
b
a
LM285-1.2  
§
§
LM385-1.2  
0 C to 70 C  
§
§
Electrical Characteristics (Note 4)  
LM285A-1.2  
LM385A-1.2  
LM385AX-1.2  
LM385AY-1.2  
LM285AX-1.2  
LM285AY-1.2  
Units  
Parameter  
Conditions  
(Limit)  
Tested  
Limit  
Design  
Limit  
Tested  
Limit  
Design  
Limit  
Typ  
Typ  
(Notes 5, 8) (Note 6)  
(Note 5) (Note 6)  
e
Reverse Breakdown  
Voltage  
I
R
100 mA  
1.235  
1.231  
1.239  
1.235  
1.231  
V(Min)  
V(Max)  
V(Min)  
V(Max)  
1.239  
1.230  
1.220 1.235  
1.245  
1.225  
1.245  
Minimum Operating  
Current  
mA  
7
8
1
10  
7
8
1
10  
(Max)  
s
s
1 mA  
Reverse Breakdown  
Voltage Change with  
Current  
I
MIN  
I
1.5  
1.5  
mV  
R
(Max)  
s
s
20 mA  
1 mA  
I
10  
20  
10  
20  
mV  
R
(Max)  
e
e
e
20 Hz  
Reverse Dynamic  
Impedance  
I
100 mA, f  
100 mA,  
0.2  
0.6  
0.2  
0.6  
X
R
R
1.5  
1.5  
(Max)  
Wideband Noise (rms)  
I
60  
20  
60  
20  
mV  
s
s
10 kHz  
10 Hz  
f
e
e
e
1000 Hr,  
Long Term Stability  
I
R
100 mA, T  
ppm  
g
25 C 0.1 C  
T
§
§
A
s
s
20 mA  
Average Temperature  
Coefficient (Note 7)  
I
I
MIN  
R
X Suffix  
Y Suffix  
30  
50  
30  
50  
ppm/ C  
§
(Max)  
All Others  
150  
150  
2
Electrical Characteristics (Continued) (Note 4)  
LM185-1.2  
LM185BX-1.2  
LM185BY-1.2  
LM285-1.2  
LM385B-1.2  
LM385BX-1.2  
LM385BY-1.2  
LM385-1.2  
Units  
(Limit)  
Parameter  
Conditions  
Typ  
LM285BX-1.2  
LM285BY-1.2  
Tested Design Tested Design Tested Design  
Limit Limit Limit Limit Limit Limit  
(Notes 5, 8) (Note 6) (Note 5) (Note 6) (Note 5) (Note 6)  
e
10 mA  
Reverse Breakdown  
Voltage  
T
A
25 C,  
§
1.223  
1.247  
1.223  
1.247  
1.205  
1.260  
V(Min)  
V(Max)  
1.235  
8
s
s
s
I
20 mA  
1 mA  
R
Minimum Operating  
Current  
10  
20  
1.5  
20  
15  
20  
1.5  
25  
15  
20  
1.5  
25  
mA  
(Max)  
s
Reverse Breakdown  
Voltage Change with  
Current  
10 mA  
I
1
1
1
mV  
(Max)  
R
s
s
20 mA  
1 mA  
I
10  
20  
20  
mV  
(Max)  
R
e
e
e
20 Hz  
Reverse Dynamic  
Impedance  
I
100 mA, f  
100 mA,  
R
1
X
Wideband Noise (rms)  
I
R
60  
20  
mV  
s
s
10 Hz  
f
10 kHz  
e
e
e
1000 Hr,  
Long Term Stability  
I
R
100 mA, T  
ppm  
g
25 C 0.1 C  
T
§
§
A
e
X Suffix  
Average Temperature  
Coefficient (Note 7)  
I
R
100 mA  
30  
50  
30  
50  
ppm/ C  
§
Y Suffix  
All Others  
ppm/ C  
§
150  
150  
150 ppm/ C  
§
(Max)  
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is  
intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics.  
The guaranteed specifications apply only for the test conditions listed.  
Note 2: Refer to RETS185H-1.2 for military specifications.  
Note 3: For elevated temperature operation, T max is:  
j
LM185  
LM285  
LM385  
150 C  
§
125 C  
§
100 C  
§
Thermal Resistance  
TO-92  
TO-46  
SO-8  
i
i
(junction to ambient)  
JA  
180 C/W (0.4 leads)  
×
§
440 C/W  
§
165 C/W  
§
§
170 C/W (0.125 leads)  
×
(junction to case)  
JC  
N/A  
80 C/W  
§
N/A  
e
e
25 C.  
Note 4: Parameters identified with boldface type apply at temperature extremes. All other numbers apply at T  
Note 5: Guaranteed and 100% production tested.  
T
J
§
A
Note 6: Guaranteed, but not 100% production tested. These limits are not used to calculate average outgoing quality levels.  
Note 7: The average temperature coefficient is defined as the maximum deviation of reference voltage at all measured temperatures between the operating T  
MAX  
b
b b  
T . The measured temperatures are 55 C, 40 C, 0 C, 25 C, 70 C, 85 C, 125 C.  
§ § § § § § §  
MIN  
and T  
, divided by T  
MIN  
MAX  
Note 8: A military RETS electrical specification is available on request.  
3
Typical Performance Characteristics  
Reverse Characteristics  
Reverse Characteristics  
Forward Characteristics  
Temperature Drift of 3  
Representative Units  
Reverse Dynamic Impedance  
Reverse Dynamic Impedance  
Noise Voltage  
Filtered Output Noise  
Response Time  
TL/H/5518–3  
4
Typical Applications (Continued)  
Micropower Reference  
from 9V Battery  
Reference from  
1.5V Battery  
TL/H/5518–2  
Micropower* 5V Regulator  
Micropower* 10V Reference  
1.23V  
TL/H/5518–4  
e
*I  
OUT  
R2  
5
Typical Applications (Continued)  
METER THERMOMETERS  
Lower Power Thermometer  
b
0 C 100 C Thermometer  
§
§
Calib
1. Sh
2. Re
²
I
Q
a
I
a
Q
Calibration  
1. Short LM385-1.2, adjust R3 for I  
TL/H/5518–5  
e
temp at 1.8 mA/ K  
§
OUT  
2. Remove short, adjust R2 for correct reading in  
F
§
Adjustment Procedure  
1. Adjust TC ADJ pot until voltage across R1 equals Kelvin temperature  
multiplied by the thermocouple Seebeck coefficient.  
2. Adjust zero ADJ pot until voltage across R2 equals the thermocouple  
Seebeck coefficient multiplied by 273.2.  
Thermocouple  
Type  
Seebeck  
R1  
R2  
Voltage  
Voltage  
Coefficient (X)  
(X)  
Across R1 Across R2  
@
(mV/ C)  
25 C  
(mV)  
§
§
(mV)  
15.60  
12.77  
12.17  
1.908  
J
T
K
S
52.3  
42.8  
40.8  
6.4  
523 1.24k  
432 1k  
14.32  
11.78  
11.17  
1.766  
412 953X  
63.4 150X  
Typical supply current 50 mA  
6
Typical Applications (Continued)  
Centigrade Thermometer  
Calibration  
e
1. Adjust R1 so that V1  
2. Adjust V2 to 273.2 mV  
temp at 1 mV/ K  
§
²
I
for 1.3V to 1.6V battery volt-  
e
Q
age  
50 mA to 150 mA  
TL/H/5518–1  
Schematic Diagram  
TL/H/5518–7  
Connection Diagrams (Continued)  
TL/H/5518–12  
Order Number LM185E-1.2/883  
See NS Package Number E20A  
7
Physical Dimensions inches (millimeters)  
Order Number LM185E-1.2/883  
NS Package Number E20A  
8
Physical Dimensions inches (millimeters) (Continued)  
TO-46 Metal Can Package (H)  
Order Number LM185H-1.2, LM185H-1.2/883, LM185BXH-1.2, LM285H-1.2, LM285BXH-1.2 or LM285BYH-1.2  
NS Package Number H02A  
Small Outline (SO-8) Package  
Order Number LM285M-1.2, LM285AM-1.2, LM285AXM-1.2, LM285AYM-1.2, LM285BXM-1.2,  
LM285BYM-1.2, LM385M-1.2, LM385AM-1.2, LM385AXM-1.2, LM385AYM-1.2, LM385BM-1.2,  
LM385BXM-1.2, LM385BYM-1.2, LM385SM-1.2, LM385ASM-1.2 or LM385BSM-1.2  
NS Package Number M08A  
9
Physical Dimensions inches (millimeters) (Continued)  
TO-92 Plastic Package (Z)  
Order Number LM285Z-1.2, LM285AZ-1.2, LM285AXZ-1.2, LM285AYZ-1.2,  
LM285BXZ-1.2, LM285BYZ-1.2, LM385Z-1.2, LM385AZ-1.2, LM385AXZ-1.2,  
LM385AYZ-1.2, LM385BZ-1.2, LM385BXZ-1.2 or LM385BYZ-1.2  
NS Package Number Z03A  
LIFE SUPPORT POLICY  
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT  
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL  
SEMICONDUCTOR CORPORATION. As used herein:  
1. Life support devices or systems are devices or  
systems which, (a) are intended for surgical implant  
into the body, or (b) support or sustain life, and whose  
failure to perform, when properly used in accordance  
with instructions for use provided in the labeling, can  
be reasonably expected to result in a significant injury  
to the user.  
2. A critical component is any component of a life  
support device or system whose failure to perform can  
be reasonably expected to cause the failure of the life  
support device or system, or to affect its safety or  
effectiveness.  
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