LM285D-1-2 Equivalent & Substitute Parts

Part Overview

The LM285D-1-2 is a shunt voltage reference IC manufactured by Texas Instruments, designed for precision voltage reference applications requiring fixed 1.235V output. This component operates as a micropower voltage reference with ±1% tolerance and is packaged in 8-SOIC surface mount configuration. The part is currently in Last Time Buy status, making identification of active equivalent and substitute parts essential for design continuity and procurement planning.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Type	Fixed
Voltage - Output (Min/Fixed)	1.235V
Current - Output	20 mA
Tolerance	±1%
Noise - 10Hz to 10kHz	60µVrms
Current - Cathode	10 µA
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the LM285D-1-2 is determined by strict equivalence across the following critical parameters:

Reference Type: Shunt
Output Voltage: 1.235V fixed
Output Current: 20 mA
Tolerance: ±1%
Package: 8-SOIC
Noise Performance: 60µVrms (10Hz to 10kHz)
Cathode Current: 10 µA
Operating Temperature Range: -40°C ~ 85°C

Substitute parts are grouped by packaging format (Tube, Tape & Reel, Bulk, Cut Tape) and temperature coefficient variation. All listed substitutes maintain identical electrical output specifications and package geometry, ensuring direct pin-compatible replacement. Temperature coefficient differences do not affect substitutability for applications where the primary requirement is fixed 1.235V reference output within the specified tolerance band.

Parameter Comparison

Part Number	Manufacturer	Voltage Output	Tolerance	Temp Coeff	Cathode Current	Operating Temp	Packaging	Product Status
LM285D-1-2	Texas Instruments	1.235V	±1%	20ppm/°C	10 µA	-40°C ~ 85°C	Tube	Last Time Buy
LM285BXM-1.2/NOPB	National Semiconductor	1.235V	±1%	30ppm/°C	10 µA	-40°C ~ 85°C	Bulk	Active
LM285BXMX-1.2/NOPB	Texas Instruments	1.235V	±1%	30ppm/°C	10 µA	-40°C ~ 85°C	Tape & Reel (TR)	Active
LM285BYM-1.2/NOPB	Texas Instruments	1.235V	±1%	50ppm/°C	10 µA	-40°C ~ 85°C	Tube	Active
LM285BYMX-1.2/NOPB	Texas Instruments	1.235V	±1%	50ppm/°C	10 µA	-40°C ~ 85°C	Tape & Reel (TR)	Active
LM285M-1.2/NOPB	Texas Instruments	1.235V	±1%	150ppm/°C	10 µA	-40°C ~ 85°C	Tube	Active
LM285MX-1.2/NOPB	Texas Instruments	1.235V	±1%	150ppm/°C	10 µA	-40°C ~ 85°C	Cut Tape (CT) & Digi-Reel®	Active
LM385BM-1.2/NOPB	Texas Instruments	1.235V	±1%	150ppm/°C	15 µA	0°C ~ 70°C	Tube	Active
LM385BMX-1.2/NOPB	Texas Instruments	1.235V	±1%	150ppm/°C	15 µA	0°C ~ 70°C	Tape & Reel (TR)	Active
LM385M-1.2/NOPB	Texas Instruments	1.235V	-2.43%, +2.02%	150ppm/°C	15 µA	0°C ~ 70°C	Tube	Active
LM385MX-1.2/NOPB	Texas Instruments	1.235V	-2.43%, +2.02%	150ppm/°C	15 µA	0°C ~ 70°C	Tape & Reel (TR)	Active

Engineering Selection Recommendations

For direct replacement of LM285D-1-2 in active production, select from the LM285 series parts maintaining ±1% tolerance and -40°C ~ 85°C operating range. LM285BYM-1.2/NOPB and LM285BYMX-1.2/NOPB offer the closest thermal performance match with 50ppm/°C temperature coefficient while maintaining full temperature range coverage.

LM285M-1.2/NOPB and LM285MX-1.2/NOPB are suitable alternatives where higher temperature coefficient (150ppm/°C) is acceptable within application requirements. These parts are available in active status with established supply chains.

LM385 series substitutes (LM385BM-1.2/NOPB, LM385BMX-1.2/NOPB, LM385M-1.2/NOPB, LM385MX-1.2/NOPB) are electrically compatible but operate within restricted temperature range (0°C ~ 70°C) and exhibit higher cathode current (15 µA). These are suitable only for applications not requiring the full -40°C ~ 85°C operating envelope.

All recommended substitutes maintain ROHS3 compliance, MSL Level 1 rating, and identical 8-SOIC package geometry. Selection should prioritize parts with Active product status to ensure long-term availability.

Frequently Asked Questions (FAQ)

Q: Can LM385 series parts directly replace LM285D-1-2?

A: LM385 parts are pin-compatible and electrically equivalent for the 1.235V output specification. However, they operate within 0°C ~ 70°C temperature range versus the LM285D-1-2 range of -40°C ~ 85°C. Use LM385 substitutes only if your application does not require operation below 0°C or above 70°C.

Q: What is the difference between Tube, Tape & Reel, and Bulk packaging?

A: Packaging format affects procurement and assembly processes. Tube packaging is suitable for manual handling and smaller quantities. Tape & Reel (TR) format is optimized for automated pick-and-place assembly. Bulk packaging is used for high-volume orders. All formats contain identical components; selection depends on manufacturing process requirements.

Q: Does temperature coefficient affect substitutability?

A: Temperature coefficient variations (20ppm/°C, 30ppm/°C, 50ppm/°C, 150ppm/°C) do not prevent substitution. All listed parts maintain the specified 1.235V output within ±1% tolerance across their operating temperature ranges. Select based on application drift requirements over the operating temperature span.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, matching the original LM285D-1-2 specifications.

Q: Which substitute offers the best availability?

A: LM385M-1.2/NOPB and LM385MX-1.2/NOPB show the highest inventory levels (26,863 and 27,700 units respectively). For LM285 series, LM285BYMX-1.2/NOPB offers strong availability (5,200 units) with Active product status.

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