If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Reverse Current
Forward Current
Operating Temperature
Range (Note 3)
LM185-2.5
LM285-2.5
−55˚C to + 125˚C
−40˚C to + 85˚C
30 mA
10 mA
See AN-450 “Surface Mounting Methods and Their Effect on
Product Reliability” for other methods of soldering surface
mount devices.
Electrical Characteristics
(Note 4)
LM385A-2.5
LM385AX-2.5
Parameter
Conditions
Typ
LM385AY-2.5
Tested
Limit
(Note 5)
Reverse Breakdown
Voltage
2.500
Minimum Operating
Current
Reverse Breakdown
Voltage Change with
Current
Reverse Dynamic
Impedance
Wideband Noise (rms)
Long Term Stability
1 mA
≤
I
R
≤
20 mA
I
R
= 100 µA,
f = 20 Hz
I
R
= 100 µA
10 Hz
≤
f
≤
10 kHz
I
R
= 100 µA,
T = 1000 Hr,
T
A
= 25˚C
±
0.1˚C
Average Temperature
Coefficient (Note 7)
I
MIN
≤
I
R
≤
20 mA
X Suffix
Y Suffix
All Others
30
50
150
ppm/˚C
(Max)
20
ppm
120
0.2
10
20
0.6
1.5
µV
I
MIN
≤
I
R
≤
1mA
1
1.5
12
18
I
R
= 100 µA
2.500
2.480
2.520
2.470
2.530
20
Design
Limit
(Note 6)
V(Min)
V(Max)
V(Min)
V(Max)
µA
(Max)
mV
(Max)
mV
(Max)
Ω
Units
(Limits)
3
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LM185-2.5/LM285-2.5/LM385-2.5
Electrical Characteristics
LM185-2.5
LM185BX-2.5
LM185BY-2.5
LM285-2.5
Parameter
Conditions
Typ
LM285BX-2.5
LM285BY-2.5
Tested
Limit
(Note 5) (Note
8)
Reverse
Breakdown
Voltage
Minimum
Operating
Current
Reverse
Breakdown
Voltage Change
with Current
Reverse
Dynamic
Impedance
Wideband
Noise (rms)
T
A
= 25˚C,
20 µA
≤
I
R
≤
20
mA
13
LM385M3-2.5
20 µA
≤
I
R
≤
1
mA
1 mA
≤
I
R
≤
20
mA
I
R
= 100 µA,
f = 20 Hz
I
R
= 100 µA,
10 Hz
≤
f
≤
10
kHz
Long Term
Stability
I
R
= 100 µA,
T = 1000 Hr,
T
A
= 25˚C
±
0.1˚C
Average
Temperature
Coefficient
(Note 7)
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
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-2.5 for military specifications.
Note 3:
For elevated temperature operation, T
J MAX
is:
LM185
150˚C
LM285
LM385
125˚C
100˚C
LM385B-2.5
LM385BX-2.5
LM385BY-2.5
LM385-2.5
Units
(Limit)
Design
Limit
(Note
6)
Tested
Limit
(Note
5)
2.462
2.538
Design
Limit
(Note 6)
Tested Design
Limit
(Note
5)
2.425
2.575
Limit
(Note
6)
V(Min)
V(Max)
30
20
2.5
25
µA
(Max)
mV
(Max)
mV
(Max)
Ω
2.5
2.462
2.538
20
30
20
30
20
15
1
10
1.5
20
2.0
20
2.5
25
2.0
20
1
120
µV
20
ppm
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
SO-8
SOT-23
440˚C/W 165˚C/W 283˚C/W
80˚C/W
N/A
N/A
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4
LM185-2.5/LM285-2.5/LM385-2.5
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 available on request.
