LM385MX-2.5 Equivalent & Substitute Parts

Part Overview

The LM385MX-2.5 is a shunt voltage reference IC manufactured by Texas Instruments, providing a fixed 2.5V output with ±3% tolerance. This surface-mount component in 8-SOIC packaging is classified as obsolete, making substitute parts necessary for new designs and ongoing production support. The device operates across 0°C to 70°C and delivers 20 mA output current, serving as a precision voltage reference in power management applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM385MX-2.5
Manufacturer	Texas Instruments
Reference Type	Shunt
Output Type	Fixed
Voltage - Output	2.5V
Current - Output	20 mA
Tolerance	±3%
Temperature Coefficient	150 ppm/°C
Noise (10Hz to 10kHz)	120 µVrms
Operating Temperature	0°C ~ 70°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the LM385MX-2.5 is determined by the following critical parameters:

Fixed Substitution Criteria:

Reference Type: Shunt
Output Type: Fixed
Voltage - Output: 2.5V
Current - Output: 20 mA
Package / Case: 8-SOIC (0.154", 3.90mm Width)
Mounting Type: Surface Mount

Allowable Parameter Variations:

Tolerance: ±3% (main part) to ±1.5% (improved tolerance acceptable)
Temperature Coefficient: 150 ppm/°C (main part) to 20-80 ppm/°C (improved stability acceptable)
Operating Temperature: 0°C ~ 70°C (main part) to -40°C ~ 85°C (extended range acceptable)
Noise (10Hz to 10kHz): 120 µVrms (consistent across all parts)
RoHS Status: Non-compliant (main part) to ROHS3 Compliant (preferred for new designs)

Substitute parts are grouped into two categories: Texas Instruments direct replacements and cross-manufacturer equivalents from onsemi and National Semiconductor, all maintaining identical electrical output specifications and package compatibility.

Parameter Comparison

Part Number	Manufacturer	Voltage Output	Current Output	Tolerance	Temp Coeff	Operating Temp	Package	Product Status	RoHS Status
LM385MX-2.5	Texas Instruments	2.5V	20 mA	±3%	150 ppm/°C	0°C ~ 70°C	8-SOIC	Obsolete	Non-compliant
LM385MX/NOPB	Texas Instruments	1.24V - 5.3V (Adjustable)	20 mA	±2%	30 ppm/°C	0°C ~ 70°C	8-SOIC	Active	ROHS3 Compliant
LM285D-2-5	Texas Instruments	2.5V	20 mA	±1.5%	20 ppm/°C	-40°C ~ 85°C	8-SOIC	Last Time Buy	ROHS3 Compliant
LM285DR-2-5	Texas Instruments	2.5V	20 mA	±1.5%	20 ppm/°C	-40°C ~ 85°C	8-SOIC	Last Time Buy	ROHS3 Compliant
LM285DRG4-2-5	Texas Instruments	2.5V	20 mA	±1.5%	20 ppm/°C	-40°C ~ 85°C	8-SOIC	Obsolete	ROHS3 Compliant
LM385BDR-2-5	Texas Instruments	2.5V	20 mA	±1.5%	20 ppm/°C	0°C ~ 70°C	8-SOIC	Last Time Buy	ROHS3 Compliant
LM385DR-2-5	Texas Instruments	2.5V	20 mA	±3%	20 ppm/°C	0°C ~ 70°C	8-SOIC	Last Time Buy	ROHS3 Compliant
LM385DRG4-2-5	Texas Instruments	2.5V	20 mA	±3%	20 ppm/°C	0°C ~ 70°C	8-SOIC	Obsolete	ROHS3 Compliant
LM385MX-2.5/NOPB	National Semiconductor	2.5V	20 mA	±3%	150 ppm/°C	0°C ~ 70°C	8-SOIC	Active	Not specified
LM285D-2.5G	onsemi	2.5V	20 mA	±1.5%	80 ppm/°C	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
LM285D-2.5R2G	onsemi	2.5V	20 mA	±1.5%	80 ppm/°C	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation for Active Production: LM285D-2.5G or LM285D-2.5R2G (onsemi) are preferred substitutes. Both parts maintain the 2.5V fixed output and 20 mA current specification while offering improved tolerance (±1.5%), lower temperature coefficient (80 ppm/°C), extended operating temperature range (-40°C ~ 85°C), and ROHS3 compliance. These parts are currently in active production status with substantial inventory availability.

Alternative from Texas Instruments: LM385BDR-2-5 provides a direct Texas Instruments alternative with ±1.5% tolerance, 20 ppm/°C temperature coefficient, and ROHS3 compliance. Operating temperature remains 0°C ~ 70°C, matching the original part's thermal range. This part is in Last Time Buy status.

Parametric Equivalent: LM385MX-2.5/NOPB (National Semiconductor) matches the original part's electrical specifications exactly (±3% tolerance, 150 ppm/°C temperature coefficient, 0°C ~ 70°C operating range) and is currently in active production. This option is suitable for designs requiring identical performance characteristics to the obsolete original.

Not Recommended: LM385MX/NOPB is an adjustable output variant (1.24V - 5.3V) and is not suitable as a direct substitute for fixed 2.5V applications.

Frequently Asked Questions (FAQ)

Q: Can I use LM285D-2.5G as a direct replacement for LM385MX-2.5? A: Yes. Both parts provide 2.5V fixed output at 20 mA in 8-SOIC packaging. The LM285D-2.5G offers improved specifications with ±1.5% tolerance versus ±3%, lower temperature coefficient (80 ppm/°C versus 150 ppm/°C), and extended operating temperature range (-40°C ~ 85°C versus 0°C ~ 70°C). ROHS3 compliance is an additional benefit for new designs.

Q: What is the difference between LM285D-2.5G and LM285D-2.5R2G? A: Both parts are electrically identical with matching specifications. The difference is packaging: LM285D-2.5G is supplied in Tube packaging, while LM285D-2.5R2G is supplied in Cut Tape & Digi-Reel format. Select based on your procurement and assembly requirements.

Q: Why is LM385MX/NOPB listed but not recommended? A: LM385MX/NOPB is an adjustable output reference (1.24V - 5.3V range) rather than a fixed 2.5V output. It is not electrically compatible with applications requiring a fixed 2.5V reference and should not be used as a substitute.

Q: Are all substitute parts available in the same 8-SOIC package? A: Yes. All listed substitute parts use the 8-SOIC (0.154", 3.90mm Width) package, ensuring mechanical and electrical compatibility with the original LM385MX-2.5 footprint.

Q: What is the significance of "Last Time Buy" status? A: Parts marked as Last Time Buy are in their final production phase. Inventory is available but will not be replenished after current stock is exhausted. For long-term production, select parts with Active status such as LM285D-2.5G or LM285D-2.5R2G.

Q: Does operating temperature range affect substitution? A: Operating temperature range is an allowable variation parameter. The original part operates 0°C ~ 70°C. Substitutes with extended ranges (-40°C ~ 85°C) are acceptable and provide additional design margin. Select based on your application's thermal requirements.

Q: Are all substitute parts RoHS compliant? A: The original LM385MX-2.5 is RoHS non-compliant. All recommended substitutes (LM285D-2.5G, LM285D-2.5R2G, LM385BDR-2-5) are ROHS3 compliant, meeting current environmental regulations for new designs.

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