LM385D-2.5R2 Equivalent & Substitute Parts

Part Overview

The LM385D-2.5R2 is a shunt voltage reference IC manufactured by onsemi, providing a fixed 2.5V output with ±3% tolerance in an 8-SOIC surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The part delivers 20 mA output current and operates across the 0°C to 70°C temperature range, suitable for precision voltage reference applications in power management circuits.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Type	Fixed
Voltage - Output (Min/Fixed)	2.5V
Current - Output	20 mA
Tolerance	±3%
Temperature Coefficient	80ppm/°C Typical
Noise - 10Hz to 10kHz	120µVrms
Current - Cathode	30 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 for the LM385D-2.5R2 is determined by the following critical parameters:

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

Substitute parts are grouped into two categories:

Direct Substitutes maintain identical electrical specifications (2.5V, ±3% tolerance, 20 mA output) with the same package footprint. These parts are pin-compatible and functionally equivalent.

Similar Substitutes provide the same 2.5V output and 20 mA current in the same 8-SOIC package but with improved tolerance (±1.5%) and extended operating temperature ranges (-40°C to 85°C). These parts offer enhanced performance characteristics while maintaining mechanical and electrical compatibility.

Parameter Comparison

Part Number	Manufacturer	Voltage Output	Current Output	Tolerance	Temp Coefficient	Operating Temp	Cathode Current	Product Status	RoHS Status
LM385D-2.5R2	onsemi	2.5V	20 mA	±3%	80ppm/°C	0°C ~ 70°C	30 µA	Obsolete	RoHS non-compliant
LM385D-2.5R2G	onsemi	2.5V	20 mA	±3%	80ppm/°C	0°C ~ 70°C	30 µA	Active	ROHS3 Compliant
LM385DR-2-5	Texas Instruments	2.5V	20 mA	±3%	20ppm/°C	0°C ~ 70°C	20 µA	Last Time Buy	ROHS3 Compliant
LM285BXM-2.5/NOPB	Texas Instruments	2.5V	20 mA	±1.5%	30ppm/°C	-40°C ~ 85°C	20 µA	Active	ROHS3 Compliant
LM285BXMX-2.5/NOPB	Texas Instruments	2.5V	20 mA	±1.5%	30ppm/°C	-40°C ~ 85°C	20 µA	Active	ROHS3 Compliant
LM285BYM-2.5/NOPB	Texas Instruments	2.5V	20 mA	±1.5%	50ppm/°C	-40°C ~ 85°C	20 µA	Active	ROHS3 Compliant
LM285BYMX-2.5/NOPB	Texas Instruments	2.5V	20 mA	±1.5%	50ppm/°C	-40°C ~ 85°C	20 µA	Active	ROHS3 Compliant
LM285DR-2-5	Texas Instruments	2.5V	20 mA	±1.5%	20ppm/°C	-40°C ~ 85°C	20 µA	Last Time Buy	ROHS3 Compliant
LM285DRG4-2-5	Texas Instruments	2.5V	20 mA	±1.5%	20ppm/°C	-40°C ~ 85°C	20 µA	Obsolete	ROHS3 Compliant
LM285M-2.5/NOPB	Texas Instruments	2.5V	20 mA	±1.5%	150ppm/°C	-40°C ~ 85°C	20 µA	Active	ROHS3 Compliant
LM285MX-2.5/NOPB	Texas Instruments	2.5V	20 mA	±1.5%	150ppm/°C	-40°C ~ 85°C	20 µA	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications):

LM385D-2.5R2G is the primary direct substitute. It maintains the exact electrical specifications of the original part (2.5V, ±3% tolerance, 20 mA output, 80ppm/°C temperature coefficient) while offering active product status and ROHS3 compliance. This part is available in Cut Tape packaging with 21,500 units in stock, providing immediate availability for production.

LM385DR-2-5 from Texas Instruments provides functional equivalence with identical tolerance and output specifications. However, it exhibits improved temperature coefficient performance (20ppm/°C versus 80ppm/°C) and lower cathode current (20 µA versus 30 µA). This part carries Last Time Buy status, indicating limited future availability.

For Enhanced Performance:

LM285 series parts (LM285BXM-2.5/NOPB, LM285BXMX-2.5/NOPB, LM285BYM-2.5/NOPB, LM285BYMX-2.5/NOPB, LM285DR-2-5, LM285M-2.5/NOPB, LM285MX-2.5/NOPB) are suitable when improved tolerance and extended temperature range are acceptable. These parts deliver ±1.5% tolerance and operate from -40°C to 85°C, compared to the original ±3% tolerance and 0°C to 70°C range. All LM285 variants maintain the same 2.5V output, 20 mA current, and 8-SOIC package footprint.

All substitute parts listed are ROHS3 compliant, addressing regulatory requirements not met by the original LM385D-2.5R2.

Frequently Asked Questions (FAQ)

Q: Can LM385D-2.5R2G be used as a direct replacement for LM385D-2.5R2?

A: Yes. LM385D-2.5R2G is electrically and mechanically identical to LM385D-2.5R2, with the same 2.5V output, ±3% tolerance, 20 mA current, and 8-SOIC package. The primary differences are active product status and ROHS3 compliance. Pin configuration and circuit behavior are equivalent.

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

A: Both series provide 2.5V shunt voltage references in 8-SOIC packages with 20 mA output. The LM285 series offers tighter tolerance (±1.5% versus ±3%) and extended operating temperature range (-40°C to 85°C versus 0°C to 70°C). Temperature coefficient varies by grade within each series. Electrical performance is compatible for most applications, though the LM285 series provides superior stability characteristics.

Q: Are packaging variants (Tube, Cut Tape, Tape & Reel) electrically equivalent?

A: Yes. Packaging variants (Tube, Cut Tape, Tape & Reel, Digi-Reel) represent different distribution formats for the same die and electrical specifications. The part number suffix indicates packaging type. All variants of a given part number are electrically identical and pin-compatible.

Q: Why do some substitutes have lower cathode current (20 µA versus 30 µA)?

A: Cathode current represents the minimum operating current required for the reference to function. Lower cathode current indicates improved efficiency and reduced power consumption. Parts with 20 µA cathode current (LM385DR-2-5 and LM285 series) consume less power while maintaining identical output voltage and current specifications.

Q: Can I use LM285 parts in designs originally specified for LM385D-2.5R2?

A: Yes, with circuit verification. LM285 parts are pin-compatible and provide the same 2.5V output and 20 mA current in the same 8-SOIC package. The improved tolerance (±1.5%) and extended temperature range (-40°C to 85°C) are generally beneficial. However, verify that the application does not depend on the specific temperature coefficient or cathode current characteristics of the original part.

Q: What is the significance of "Last Time Buy" status?

A: Last Time Buy indicates the manufacturer has announced end-of-life for that part number. Existing inventory may be available, but future production is not planned. Parts with this status should be considered for transition planning. LM385D-2.5R2G (Active status) or LM285 series parts (Active status) are recommended for new designs requiring long-term availability.

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