LM285DR-2-5 Equivalent & Substitute Parts

Part Overview

The LM285DR-2-5 is a shunt voltage reference IC manufactured by Texas Instruments, designed for precision voltage reference applications requiring a fixed 2.5V output. This component operates as a micropower voltage reference with ±1.5% tolerance and is housed in an 8-SOIC surface mount package. The part is currently in Last Time Buy status, indicating end-of-life production. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability 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)
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 LM285DR-2-5 is determined by the following critical parameters:

Reference Type & Output Voltage: All substitutes must maintain shunt reference topology with fixed 2.5V output
Tolerance: The main part specifies ±1.5% tolerance. Substitutes with ±1.5% tolerance provide direct equivalence; substitutes with ±3% tolerance represent relaxed tolerance alternatives
Temperature Coefficient: The main part specifies 20ppm/°C typical. Substitutes with higher temperature coefficients (30ppm/°C, 50ppm/°C, 150ppm/°C) indicate reduced temperature stability
Operating Temperature Range: The main part operates -40°C ~ 85°C. Substitutes with 0°C ~ 70°C range have narrower operating windows
Current Ratings & Electrical Characteristics: All substitutes maintain 20 mA output current and 20 µA cathode current
Package & Mounting: All substitutes use identical 8-SOIC package and surface mount technology
Product Status: Active status substitutes ensure ongoing availability; Last Time Buy status indicates limited future supply

Substitutes are grouped by tolerance specification and temperature coefficient performance, with packaging variants (Tube, Cut Tape & Digi-Reel, Tape & Reel) available within each electrical specification tier.

Parameter Comparison

Part Number	Manufacturer	Tolerance	Temp Coeff	Temp Range	Packaging	Status
LM285DR-2-5	Texas Instruments	±1.5%	20ppm/°C	-40°C ~ 85°C	Cut Tape (CT) & Digi-Reel®	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

Tier 1 - Direct Equivalents (±1.5% Tolerance, -40°C ~ 85°C Range)

LM285BXMX-2.5/NOPB and LM285BXM-2.5/NOPB provide the closest electrical equivalence to the LM285DR-2-5, maintaining ±1.5% tolerance and full -40°C ~ 85°C operating range. These parts differ only in temperature coefficient (30ppm/°C vs. 20ppm/°C) and packaging format. Both are Active status products from Texas Instruments, ensuring continued availability and supply chain stability.

Tier 2 - Extended Temperature Coefficient Variants (±1.5% Tolerance, -40°C ~ 85°C Range)

LM285BYM-2.5/NOPB, LM285BYMX-2.5/NOPB, LM285M-2.5/NOPB, and LM285MX-2.5/NOPB maintain ±1.5% tolerance and full temperature operating range but feature higher temperature coefficients (50ppm/°C and 150ppm/°C). These substitutes are suitable for applications where temperature stability is less critical than in the original design.

Tier 3 - Relaxed Specifications (±1.5% Tolerance, 0°C ~ 70°C Range)

LM385BM-2.5/NOPB and LM385BMX-2.5/NOPB maintain ±1.5% tolerance but operate within a narrower temperature range (0°C ~ 70°C). These parts are suitable only for applications that do not require the extended -40°C lower temperature limit.

Tier 4 - Relaxed Tolerance (±3% Tolerance, 0°C ~ 70°C Range)

LM385M-2.5/NOPB and LM385MX-2.5/NOPB feature relaxed ±3% tolerance and 0°C ~ 70°C operating range. These substitutes are appropriate only for applications with less stringent voltage reference accuracy requirements.

All substitute parts maintain ROHS3 compliance, MSL Level 1 rating, and identical 8-SOIC package geometry, ensuring mechanical and environmental compatibility with existing PCB designs.

Frequently Asked Questions (FAQ)

Q: Can I directly replace LM285DR-2-5 with LM285BXMX-2.5/NOPB?

A: Yes. Both parts maintain ±1.5% tolerance, 2.5V fixed output, 20 mA output current, and -40°C ~ 85°C operating range. The primary difference is temperature coefficient (30ppm/°C vs. 20ppm/°C), which represents a minor increase in temperature-dependent drift. Electrical and mechanical compatibility is confirmed.

Q: What is the difference between LM285 and LM385 series parts?

A: Both series provide 2.5V shunt voltage references in 8-SOIC packages. The LM385 series typically features narrower operating temperature ranges (0°C ~ 70°C vs. -40°C ~ 85°C) and may have relaxed tolerance specifications (±3% vs. ±1.5%). Selection depends on application temperature requirements and accuracy specifications.

Q: Does packaging format affect electrical performance?

A: No. Tube, Cut Tape & Digi-Reel, Tape & Reel, and Bulk packaging formats contain identical die and electrical characteristics. Packaging selection is determined by assembly process requirements and volume handling preferences, not electrical performance.

Q: Why does LM285DR-2-5 show Last Time Buy status?

A: Last Time Buy status indicates the manufacturer has discontinued production and will not accept new orders after a specified date. Active status substitutes ensure long-term design support and supply chain continuity. Migration to an Active status part is recommended for new designs and ongoing production.

Q: Can I use a part with higher temperature coefficient in a precision application?

A: Temperature coefficient determines voltage drift across the operating temperature range. Higher coefficients (150ppm/°C vs. 20ppm/°C) result in greater output voltage variation with temperature. Substitution is permissible only if application specifications allow the increased temperature-dependent drift.

Q: Are all listed substitutes ROHS3 compliant?

A: All Texas Instruments manufactured parts in the substitute list are ROHS3 compliant. National Semiconductor parts (LM385BM-2.5/NOPB and LM385MX-2.5/NOPB) do not specify ROHS3 status in the provided data. Verify compliance requirements with your procurement specifications before selection.

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