LM285, LM385B
Micropower Voltage
Reference Diodes
The LM285/LM385 series are micropower twoterminal bandgap
voltage regulator diodes. Designed to operate over a wide current
range of 10 A to 20 mA, these devices feature exceptionally low
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dynamic impedance, low noise and stable operation over time and
temperature. Tight voltage tolerances are achieved by onchip
MARKING
trimming. The large dynamic operating range enables these devices to
DIAGRAMS
be used in applications with widely varying supplies with excellent
regulation. Extremely low operating current make these devices ideal
8
for micropower circuitry like portable instrumentation, regulators and
SOIC8 y85z
other analog circuitry where extended battery life is required.
ALYW
D SUFFIX
8
The LM285/LM385 series are packaged in a low cost TO226 CASE 751
1
1
plastic case and are available in two voltage versions of 1.235 V and
2.500 V as denoted by the device suffix (see Ordering Information
table). The LM285 is specified over a 40C to +85C temperature
range while the LM385 is rated from 0C to +70C.
The LM385 is also available in a surface mount plastic package in LMy85
TO92
Zxxx
(TO226)
voltages of 1.235 V and 2.500 V.
ALYW
N.C. Z SUFFIX
CASE 29
Cathode
Features
Anode
Operating Current from 10 A to 20 mA
1.0%, 1.5%, 2.0% and 3.0% Initial Tolerance Grades
xxx = 1.2 or 2.5
y = 2 or 3
Low Temperature Coefficient
z = 1 or 2
1.0 Dynamic Impedance
A = Assembly Location
L = Wafer Lot
Surface Mount Package Available
Y = Year
These Devices are PbFree and are RoHS Compliant
W = Work Week
= PbFree Package
(Note: Microdot may be in either location)
Cathode
10 k
360 k (Bottom View) 8
1
N.C. Cathode
Open
12 3
2 7
N.C. N.C.
for 1.235 V
3 6
N.C. N.C.
4 5 N.C.
Anode
600 k
8.45 k
Standard Application
74.3 k
600 k
+
Open
1.5 V 3.3 k
425 k
for 2.5 V
Battery
-
1.235 V
600 k
500 100 k
LM3851.2
Anode
ORDERING INFORMATION
Figure 1. Representative Schematic Diagram
See detailed ordering and shipping information in the package
dimensions section on page 6 of this data sheet.
Semiconductor Components Industries, LLC, 2016
1 Publication Order Number:
October, 2016 Rev. 9 LM285/DLM285, LM385B
MAXIMUM RATINGS (T = 25C, unless otherwise noted)
A
Rating Symbol Value Unit
Reverse Current I 30 mA
R
Forward Current I 10 mA
F
Operating Ambient Temperature Range T C
A
LM285 40 to +85
LM385 0 to +70
Operating Junction Temperature T +150 C
J
Storage Temperature Range T 65 to + 150 C
stg
Electrostatic Discharge Sensitivity (ESD) ESD V
Human Body Model (HBM) 4000
Machine Model (MM) 400
Charged Device Model (CDM) 2000
Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality
should not be assumed, damage may occur and reliability may be affected.
ELECTRICAL CHARACTERISTICS (T = 25C, unless otherwise noted)
A
LM2851.2 LM3851.2/LM385B1.2
Min Typ Max Min Typ Max
Characteristic Symbol Unit
Reverse Breakdown Voltage (I I 20 mA) V V
Rmin R (BR)R
LM2851.2/LM385B1.2
1.223 1.235 1.247 1.223 1.235 1.247
T = T to T (Note 1)
1.200 1.270 1.210 1.260
A low high
LM3851.2
1.205 1.235 1.260
T = T to T (Note 1)
1.192 1.273
A low high
Minimum Operating Current I A
Rmin
T = 25C
8.0 8.0
A 10 15
T = T to T (Note 1)
A low high
20 20
Reverse Breakdown Voltage Change with Current mV
V
(BR)R
I I 1.0 mA, T = +25C
Rmin R A 1.0 1.0
T = T to T (Note 1)
1.5 1.5
A low high
10 20
1.0 mA I 20 mA, T = +25C
R A
20 25
T = T to T (Note 1)
A low high
Reverse Dynamic Impedance Z
0.6 0.6
I = 100 A, T = +25C
R A
Average Temperature Coefficient V /T ppm/C
(BR)
80 80
10 A I 20 mA, T = T to T (Note 1)
R A low high
Wideband Noise (RMS) n V
I = 100 A, 10 Hz f 10 kHz
60 60
R
Long Term Stability S ppm/kHR
I = 100 A, T = +25C 0.1C
R A 20 20
Reverse Breakdown Voltage (I I 20 mA) V V
Rmin R (BR)R
LM2852.5/LM385B2.5
2.462 2.5 2.538 2.462 2.5 2.538
T = T to T (Note 1)
2.415 2.585 2.436 2.564
A low high
LM3852.5
2.425 2.5 2.575
T = T to T (Note 1)
2.400 2.600
A low high
Minimum Operating Current I A
Rmin
13 20 13 20
T = 25C
A
T = T to T (Note 1) 30 30
A low high
1. T = 40C for LM2851.2, LM2852.5
low
T = +85C for LM2851.2, LM2852.5
high
T = 0C for LM3851.2, LM385B1.2, LM3852.5, LM385B2.5
low
T =+70C for LM3851.2, LM385B1.2, LM3852.5, LM385B2.5
high
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