If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
(Note 2)
Reverse Current
Forward Current
Operating Temperature Range (Note 3)
LM185-1.2
LM285-1.2
LM385-1.2
30 mA
10 mA
−55˚C to +125˚C
−40˚C to +85˚C
0˚C to 70˚C
Storage Temperature
−55˚C to +150˚C
Soldering Information
TO-92 package: 10 sec.
260˚C
TO-46 package:10 sec.
300˚C
SO and SOT Pkg.
Vapor phase (60 sec.)
215˚C
Infrared (15 sec.)
220˚C
See AN-450 “Surface Mounting Methods and Their Effect
on Product Reliability” for other methods of soldering
surface mount devices.
Electrical Characteristics
(Note 4)
Parameter
Conditions
LM285A-1.2
LM285AX-1.2
LM285AY-1.2
Tested
Typ
Reverse Breakdown
Voltage
1.230
Minimum Operating
Current
Reverse Breakdown
Voltage Change
with Current
Reverse Dynamic
Impedance
Wideband Noise (rms)
Long Term Stability
Average Temperature
Coefficient (Note 7)
I
R
= 100 µA,
10 Hz
≤
f
≤
10 kHz
I
R
= 100 µA, T = 1000 Hr,
T
A
= 25˚C
±
0.1˚C
I
MIN
≤
I
R
≤
20 mA
X Suffix
Y Suffix
All Others
30
50
150
30
50
150
ppm/˚C
(Max)
60
20
1 mA
≤
I
R
≤
20 mA
I
R
= 100 µA, f = 20 Hz
0.2
10
20
0.6
1.5
60
20
0.2
10
20
0.6
1.5
I
MIN
≤
I
R
≤
1 mA
1
1.5
1
1.5
7
8
I
R
= 100 µA
1.235
Limit
(Notes 5, 8)
1.231
1.239
1.220
1.245
10
7
8
1.235
Design
Limit
(Note 6)
1.235
Typ
LM385A-1.2
LM385AX-1.2
LM385AY-1.2
Tested
Limit
(Note 5)
1.231
1.239
1.225
1.245
10
Design
Limit
(Note 6)
V(Min)
V(Max)
V(Min)
V(Max)
µA
(Max)
mV
(Max)
mV
(Max)
Ω
(Max)
µV
ppm
Units
(Limit)
3
www.national.com
Electrical Characteristics
(Note 4)
LM185-1.2
LM185BX-1.2
LM185BY-1.2
LM285-1.2
Parameter
Conditions
Typ
LM285BX-1.2
LM285BY-1.2
Tested
Limit
(Notes
5, 8)
Reverse Breakdown
Voltage
Minimum Operating
Current
Reverse Breakdown
Voltage Change
with Current
Reverse Dynamic
Impedance
Wideband Noise
(rms)
Long Term Stability
Average Temperature
Coefficient (Note 7)
I
R
= 100 µA,
10 Hz
≤
f
≤
10 kHz
I
R
= 100 µA, T = 1000 Hr,
T
A
= 25˚C
±
0.1˚C
I
R
= 100 µA
X Suffix
Y Suffix
All Others
30
50
150
30
50
150
150
ppm/˚C
ppm/˚C
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 in-
tended 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
j
max is:
LM185 150˚C
LM285
LM385
125˚C
100˚C
LM385B-1.2
LM385BX-1.2
LM385BY-1.2
LM385-1.2
Units
(Limit)
Tested
Limit
(Note 5)
1.223
1.247
Design
Limit
(Note 6)
Tested
Limit
(Note 5)
1.205
1.260
20
1.5
25
15
10
1
20
20
15
1.5
25
Design
Limit
(Note 6)
V(Min)
V(Max)
µA
(Max)
mV
(Max)
mV
(Max)
Ω
µV
ppm
Design
Limit
(Note 6)
T
A
= 25˚C,
10 µA
≤
I
R
≤
20 mA
1.235
8
1.223
1.247
10
1
10
20
1.5
20
15
1
20
LM385M3-1.2
10 µA
≤
I
R
≤
1 mA
1 mA
≤
I
R
≤
20 mA
I
R
= 100 µA, f = 20 Hz
1
60
20
Thermal Resistance
θ
JA
(junction to ambient)
θ
JC
(junction to case)
TO-92
180˚C/W (0.4" leads)
170˚C/W (0.125" leads)
N/A
TO-46
440˚C/W
80˚C/W
SO-8
165˚C/W
N/A
SOT23
283˚C/W
N/A
Note 4:
Parameters identified with boldface type apply at temperature extremes. All other numbers apply at T
A
= T
J
= 25˚C.
Note 5:
Guaranteed and 100% production tested.
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
and T
MIN
, divided by T
MAX
− T
MIN
. The measured temperatures are −55˚C, −40˚C, 0˚C, 25˚C, 70˚C, 85˚C, 125˚C.
Note 8:
A military RETS electrical specification is available on request.
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