LM385BXM-2.5 Equivalent & Substitute Parts

Part Overview

The LM385BXM-2.5 is a shunt voltage reference IC manufactured by Texas Instruments, designed to provide a fixed 2.5V output with ±1.5% tolerance. This component operates as a precision voltage reference in power management applications, delivering 20 mA output current in an 8-SOIC surface mount package. The LM385BXM-2.5 is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Direct replacements and functionally equivalent alternatives are available from both Texas Instruments and onsemi manufacturers.

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	30ppm/°C
Noise - 10Hz to 10kHz	120µVrms
Current - Cathode	20 µA
Operating Temperature	0°C ~ 70°C (TA)
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the LM385BXM-2.5 is determined by the following critical parameters: fixed 2.5V output voltage, ±1.5% tolerance, 20 mA output current, 8-SOIC package configuration, and surface mount mounting type. Substitute parts must maintain these core electrical specifications to ensure functional compatibility in existing circuit designs.

Substitute parts are grouped into two categories:

Category 1: Direct Equivalents (Active Status) Parts that maintain identical electrical specifications and operating temperature range (0°C ~ 70°C). These include LM385BXM-2.5/NOPB from Texas Instruments, which differs only in packaging format (Tube vs. standard packaging) and RoHS compliance status.

Category 2: Functional Equivalents with Extended Temperature Range Parts that maintain core electrical specifications but offer extended operating temperature range (-40°C ~ 85°C) or alternative temperature coefficients. These include LM285BXMX-2.5/NOPB and LM285D-2.5G, which provide broader thermal operating windows suitable for industrial applications.

Category 3: Tolerance Variants Parts with ±3% tolerance instead of ±1.5%, including LM385D-2.5G and LM385D-2.5R2G. These are suitable for applications where tighter tolerance is not required.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Tolerance	Output Current	Temp Coefficient	Operating Temp	Package	RoHS Status	Product Status
LM385BXM-2.5	Texas Instruments	2.5V	±1.5%	20 mA	30ppm/°C	0°C ~ 70°C	8-SOIC	Non-compliant	Obsolete
LM385BXM-2.5/NOPB	Texas Instruments	2.5V	±1.5%	20 mA	30ppm/°C	0°C ~ 70°C	8-SOIC	ROHS3 Compliant	Active
LM285BXMX-2.5/NOPB	Texas Instruments	2.5V	±1.5%	20 mA	30ppm/°C	-40°C ~ 85°C	8-SOIC	ROHS3 Compliant	Active
LM285D-2.5G	onsemi	2.5V	±1.5%	20 mA	80ppm/°C	-40°C ~ 85°C	8-SOIC	ROHS3 Compliant	Active
LM285D-2.5R2G	onsemi	2.5V	±1.5%	20 mA	80ppm/°C	-40°C ~ 85°C	8-SOIC	ROHS3 Compliant	Active
LM385BD-2.5G	onsemi	2.5V	±1.5%	20 mA	80ppm/°C	0°C ~ 70°C	8-SOIC	ROHS3 Compliant	Active
LM385BD-2.5R2G	Texas Instruments	2.5V	±1.5%	20 mA	80ppm/°C	0°C ~ 70°C	8-SOIC	ROHS3 Compliant	Active
LM385D-2.5G	onsemi	2.5V	±3%	20 mA	80ppm/°C	0°C ~ 70°C	8-SOIC	ROHS3 Compliant	Active
LM385D-2.5R2G	onsemi	2.5V	±3%	20 mA	80ppm/°C	0°C ~ 70°C	8-SOIC	ROHS3 Compliant	Active

Engineering Selection Recommendations

For Direct Replacement (Obsolete to Active Transition) LM385BXM-2.5/NOPB is the primary direct substitute, maintaining identical electrical specifications and operating temperature range while offering ROHS3 compliance and active product status. This part is recommended for designs requiring no circuit modifications.

For Extended Temperature Range Applications LM285BXMX-2.5/NOPB and LM285D-2.5G provide -40°C ~ 85°C operating range, suitable for industrial and automotive environments. Both maintain ±1.5% tolerance and are ROHS3 compliant with active status.

For Standard Temperature Range with Alternative Sourcing LM385BD-2.5G and LM385BD-2.5R2G from onsemi provide equivalent performance within 0°C ~ 70°C operating range with ROHS3 compliance and active product status.

For Cost-Optimized Applications LM385D-2.5G and LM385D-2.5R2G offer ±3% tolerance instead of ±1.5%, suitable for applications where tighter tolerance is not required. Both are ROHS3 compliant and active.

All recommended substitutes are ROHS3 compliant and maintain active product status, ensuring long-term availability and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can LM385D-2.5G replace LM385BXM-2.5 directly? A: LM385D-2.5G is functionally compatible but has ±3% tolerance instead of ±1.5%. Use this substitute only if your circuit design tolerates the wider tolerance specification.

Q: What is the difference between LM385 and LM285 series? A: Both series provide 2.5V fixed output in 8-SOIC packages. LM285 variants offer extended operating temperature range (-40°C ~ 85°C) compared to LM385 variants (0°C ~ 70°C). Temperature coefficient differs: LM385 at 30ppm/°C versus LM285 at 80ppm/°C typical.

Q: Are all substitute parts ROHS3 compliant? A: All active substitute parts listed are ROHS3 compliant. The original LM385BXM-2.5 is RoHS non-compliant. LM385BXM-2.5/NOPB provides the same electrical performance with ROHS3 compliance.

Q: Does packaging format affect electrical performance? A: No. Tube, Cut Tape (CT), Tape & Reel (TR), and Digi-Reel packaging formats do not affect electrical specifications. Selection depends on production volume and assembly requirements.

Q: Which substitute offers the best thermal stability? A: LM385BXM-2.5/NOPB maintains the original 30ppm/°C temperature coefficient. onsemi variants (LM285D-2.5G, LM385BD-2.5G, LM385D-2.5G) have 80ppm/°C typical temperature coefficient, resulting in greater output voltage drift across temperature range.

Q: Can I use LM285BXMX-2.5/NOPB in place of LM385BXM-2.5? A: Yes. LM285BXMX-2.5/NOPB maintains identical electrical specifications with extended operating temperature range (-40°C ~ 85°C). This is a suitable upgrade for applications requiring broader thermal operation.

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