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
LM385-2.5
Storage Temperature
30 mA
10 mA
−55˚C to + 125˚C
−40˚C to + 85˚C
0˚C to 70˚C
−55˚C to + 150˚C
Soldering Information
TO-92 Package (10 sec.)
260˚C
TO-46 Package (10 sec.)
300˚C
SO and SOT Package
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)
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
0.2
120
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
www.national.com
LM185-2.5/LM285-2.5/LM385-2.5
Electrical Characteristics
(Continued)
LM185-2.5
LM185BX-2.5
LM185BY-2.5
LM285-2.5
LM385B-2.5
LM385BX-2.5
LM385BY-2.5
LM385-2.5
Units
(Limit)
Parameter
Conditions
Typ
LM285BX-2.5
LM285BY-2.5
Tested
Limit
(Note 5)
(Note 8)
Design
Limit
(Note 6)
Tested
Limit
(Note 5)
2.462
2.538
30
1.5
20
20
2.0
20
30
2.5
25
Design
Limit
(Note 6)
Tested
Limit
(Note 5)
2.425
2.575
20
15
1
10
2.0
20
30
20
2.5
25
Design
Limit
(Note 6)
V(Min)
V(Max)
µA
(Max)
mV
(Max)
mV
(Max)
Ω
µV
Reverse Breakdown
Voltage
Minimum Operating
Current
Reverse Breakdown
Voltage Change with
Current
Reverse Dynamic
Impedance
Wideband Noise (rms)
Long Term Stability
T
A
= 25˚C,
20 µA
≤
I
R
≤
20 mA
2.5
13
2.462
2.538
20
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
I
R
= 100 µA,
T = 1000 Hr,
T
A
= 25˚C
±
0.1˚C
20
1
120
ppm
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 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-2.5 for military specifications.
LM185
LM285
LM385
Note 3:
For elevated temperature operation, T
J MAX
is:
150˚C
125˚C
100˚C
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
SOT-23
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 available on request.
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