LM285D-2-5 Equivalent & Substitute Parts

Part Overview

The LM285D-2-5 is a shunt voltage reference IC manufactured by Texas Instruments, designed for precision voltage reference applications requiring fixed 2.5V output. This component operates as a shunt regulator with ±1.5% tolerance and 20 mA output current capability. The part is classified as Last Time Buy, indicating discontinued production status. Equivalent and substitute parts are necessary to maintain design continuity and ensure long-term supply availability for applications currently utilizing this reference design.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Type	Fixed
Voltage - Output (Min/Fixed)	2.5V
Current - Output	20 mA
Tolerance	±1.5%
Temperature Coefficient	20ppm/°C Typical
Noise - 10Hz to 10kHz	120µVrms
Current - Cathode	20 µA
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Package / Case	8-SOIC (0.154", 3.90mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the LM285D-2-5 are grouped based on strict electrical and mechanical compatibility criteria. All substitute candidates maintain the following core parameters:

Reference Type: Shunt
Output Type: Fixed
Voltage - Output: 2.5V
Current - Output: 20 mA
Tolerance: ±1.5%
Noise - 10Hz to 10kHz: 120µVrms
Current - Cathode: 20 µA
Mounting Type: Surface Mount
Package / Case: 8-SOIC (0.154", 3.90mm Width)

Substitutes are differentiated by temperature coefficient performance, operating temperature range, packaging format, and product status. Parts with tighter temperature coefficients (lower ppm/°C values) provide superior thermal stability. Operating temperature range variations affect suitability for extended temperature applications. Packaging options (Tube, Cut Tape, Tape & Reel, Bulk) accommodate different procurement and assembly workflows.

Parameter Comparison

Part Number	Manufacturer	Tolerance	Temperature Coefficient	Operating Temperature	Packaging	Product Status
LM285D-2-5	Texas Instruments	±1.5%	20ppm/°C	-40°C ~ 85°C	Tube	Last Time Buy
LM285BXM-2.5/NOPB	Texas Instruments	±1.5%	30ppm/°C	-40°C ~ 85°C	Tube	Active
LM285BXMX-2.5/NOPB	Texas Instruments	±1.5%	30ppm/°C	-40°C ~ 85°C	Cut Tape (CT) & Digi-Reel®	Active
LM285BYM-2.5/NOPB	Texas Instruments	±1.5%	50ppm/°C	-40°C ~ 85°C	Tube	Active
LM285BYMX-2.5/NOPB	Texas Instruments	±1.5%	50ppm/°C	-40°C ~ 85°C	Tape & Reel (TR)	Active
LM285M-2.5/NOPB	Texas Instruments	±1.5%	150ppm/°C	-40°C ~ 85°C	Tube	Active
LM285MX-2.5/NOPB	Texas Instruments	±1.5%	150ppm/°C	-40°C ~ 85°C	Cut Tape (CT) & Digi-Reel®	Active
LM385BM-2.5/NOPB	National Semiconductor	±1.5%	150ppm/°C	0°C ~ 70°C	Bulk	Active
LM385BMX-2.5/NOPB	Texas Instruments	±1.5%	150ppm/°C	0°C ~ 70°C	Tape & Reel (TR)	Active
LM385M-2.5/NOPB	Texas Instruments	±3%	150ppm/°C	0°C ~ 70°C	Tube	Active
LM385MX-2.5/NOPB	National Semiconductor	±3%	150ppm/°C	0°C ~ 70°C	Bulk	Active

Engineering Selection Recommendations

For direct replacement of LM285D-2-5 in active production designs, LM285BXM-2.5/NOPB is the primary substitute. This part maintains Active product status, identical tolerance specification (±1.5%), extended operating temperature range (-40°C ~ 85°C), and ROHS3 compliance. The temperature coefficient difference (30ppm/°C versus 20ppm/°C) represents acceptable thermal performance degradation for most precision reference applications.

LM285BXMX-2.5/NOPB provides equivalent electrical performance with Cut Tape & Digi-Reel packaging, suitable for automated assembly workflows requiring continuous reel format.

For applications with relaxed thermal stability requirements, LM285BYM-2.5/NOPB and LM285BYMX-2.5/NOPB offer Active status with 50ppm/°C temperature coefficient and flexible packaging options (Tube and Tape & Reel respectively).

LM285M-2.5/NOPB and LM285MX-2.5/NOPB are suitable for non-critical thermal applications, offering the lowest cost Active alternatives with 150ppm/°C temperature coefficient.

LM385 series parts (LM385BM-2.5/NOPB, LM385BMX-2.5/NOPB) operate within restricted temperature range (0°C ~ 70°C) and are suitable only for commercial temperature applications. LM385M-2.5/NOPB and LM385MX-2.5/NOPB exhibit ±3% tolerance, exceeding the original specification and requiring design margin verification.

All substitute parts maintain 8-SOIC package compatibility, Surface Mount mounting type, 20 mA output current, and 120µVrms noise specification.

Frequently Asked Questions (FAQ)

Q: Can LM285BXM-2.5/NOPB directly replace LM285D-2-5 without circuit modification?

A: Yes. Both parts maintain identical tolerance (±1.5%), output voltage (2.5V), output current (20 mA), and operating temperature range (-40°C ~ 85°C). The 10ppm/°C temperature coefficient difference (30ppm/°C versus 20ppm/°C) is within acceptable margins for most precision reference applications. Package and pinout are identical (8-SOIC).

Q: What is the significance of temperature coefficient differences among substitute parts?

A: Temperature coefficient (ppm/°C) quantifies output voltage drift per degree Celsius change. Lower values indicate superior thermal stability. LM285D-2-5 specifies 20ppm/°C. Substitutes range from 30ppm/°C to 150ppm/°C. Applications requiring tight voltage regulation across temperature extremes should prioritize lower temperature coefficient values. High-precision analog circuits may require design verification when upgrading to higher temperature coefficient parts.

Q: Are LM385 series parts suitable replacements for LM285D-2-5?

A: LM385 parts maintain electrical compatibility (2.5V output, 20 mA current, ±1.5% tolerance for LM385BM-2.5/NOPB and LM385BMX-2.5/NOPB) but operate within restricted temperature range (0°C ~ 70°C) versus the original -40°C ~ 85°C specification. LM385M-2.5/NOPB and LM385MX-2.5/NOPB exhibit ±3% tolerance, exceeding original specification. LM385 series substitution requires verification that application temperature and tolerance requirements are satisfied.

Q: What packaging options are available for equivalent parts?

A: Substitute parts are available in Tube, Cut Tape & Digi-Reel, Tape & Reel, and Bulk packaging formats. Tube packaging suits low-volume manual assembly. Cut Tape & Digi-Reel and Tape & Reel formats accommodate automated pick-and-place assembly. Bulk packaging is available for high-volume procurement. All packaging formats contain identical die and electrical performance.

Q: Why is LM285D-2-5 marked as Last Time Buy?

A: Last Time Buy status indicates Texas Instruments has discontinued production of this specific part number variant. Active equivalent parts (LM285BXM-2.5/NOPB, LM285BYM-2.5/NOPB, LM285M-2.5/NOPB) provide continued supply availability with identical or superior electrical specifications and maintained ROHS3 compliance.

Q: Are all substitute parts ROHS3 compliant?

A: All Texas Instruments LM285 and LM385 series parts listed are ROHS3 compliant. Compliance status is maintained across all packaging formats and temperature coefficient variants.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message