LM385D-2.5 Equivalent & Substitute Parts

Part Overview

The LM385D-2.5 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, serving applications requiring stable voltage reference functionality in compact form factors.

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
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the LM385D-2.5 is determined by strict electrical and mechanical compatibility criteria:

Primary Substitution Criteria:

Fixed 2.5V output voltage
20 mA output current capability
8-SOIC package form factor (0.154", 3.90mm Width)
Surface mount mounting type
Tolerance and temperature coefficient performance within acceptable ranges
Operating temperature range compatibility

Substitution Categories:

Direct Equivalents maintain identical electrical specifications and differ only in packaging format or RoHS compliance status. These parts are pin-compatible and functionally interchangeable without circuit modification.

Similar Parts share the same output voltage, current rating, and package but offer improved tolerance (±1.5% vs ±3%) and extended operating temperature range (-40°C to 85°C vs 0°C to 70°C). These parts are electrically compatible but provide enhanced performance characteristics. Selection depends on application temperature requirements and tolerance specifications.

Parameter Comparison

Part Number	Manufacturer	Voltage Output	Current Output	Tolerance	Temp Coefficient	Operating Temp	Package	Product Status	RoHS Status
LM385D-2.5	onsemi	2.5V	20 mA	±3%	80ppm/°C	0°C ~ 70°C	8-SOIC	Obsolete	RoHS non-compliant
LM385D-2.5G	onsemi	2.5V	20 mA	±3%	80ppm/°C	0°C ~ 70°C	8-SOIC	Active	ROHS3 Compliant
LM385D-2-5	Texas Instruments	2.5V	20 mA	±3%	20ppm/°C	0°C ~ 70°C	8-SOIC	Last Time Buy	ROHS3 Compliant
LM285BXM-2.5/NOPB	Texas Instruments	2.5V	20 mA	±1.5%	30ppm/°C	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
LM285BXMX-2.5/NOPB	Texas Instruments	2.5V	20 mA	±1.5%	30ppm/°C	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
LM285BYM-2.5/NOPB	Texas Instruments	2.5V	20 mA	±1.5%	50ppm/°C	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
LM285BYMX-2.5/NOPB	Texas Instruments	2.5V	20 mA	±1.5%	50ppm/°C	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
LM285DR-2-5	Texas Instruments	2.5V	20 mA	±1.5%	20ppm/°C	-40°C ~ 85°C	8-SOIC	Last Time Buy	ROHS3 Compliant
LM285DRG4-2-5	Texas Instruments	2.5V	20 mA	±1.5%	20ppm/°C	-40°C ~ 85°C	8-SOIC	Obsolete	ROHS3 Compliant
LM285M-2.5/NOPB	Texas Instruments	2.5V	20 mA	±1.5%	150ppm/°C	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
LM285MX-2.5/NOPB	Texas Instruments	2.5V	20 mA	±1.5%	150ppm/°C	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications):

LM385D-2.5G is the primary direct substitute, offering identical electrical performance with active product status and RoHS3 compliance. This part maintains the ±3% tolerance and 80ppm/°C temperature coefficient of the original LM385D-2.5 while providing regulatory compliance for new designs.

LM385D-2-5 (Texas Instruments) provides direct electrical equivalence with improved temperature coefficient (20ppm/°C vs 80ppm/°C) and RoHS3 compliance. However, this part carries Last Time Buy status, limiting long-term availability.

For Enhanced Performance (Improved Tolerance and Temperature Range):

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 electrically compatible substitutes offering ±1.5% tolerance and extended operating temperature range (-40°C to 85°C). These parts are suitable for applications requiring tighter voltage accuracy or operation beyond the original 0°C to 70°C range. All LM285 variants maintain 20 mA output current and 8-SOIC packaging.

Availability and Compliance Considerations:

All recommended substitutes carry RoHS3 compliance status, supporting regulatory requirements for new production. LM285 series parts with Active product status (LM285BXM-2.5/NOPB, LM285BXMX-2.5/NOPB, LM285BYM-2.5/NOPB, LM285BYMX-2.5/NOPB, LM285M-2.5/NOPB, LM285MX-2.5/NOPB) provide the longest procurement horizon for ongoing designs.

Frequently Asked Questions (FAQ)

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

A: Yes. LM385D-2.5G maintains identical electrical specifications including 2.5V output, 20 mA current, ±3% tolerance, and 8-SOIC package. The primary differences are active product status and RoHS3 compliance, making it the recommended direct substitute.

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

A: Both series provide 2.5V fixed output in 8-SOIC packages with 20 mA current capability. LM285 parts offer tighter tolerance (±1.5% vs ±3%) and extended operating temperature range (-40°C to 85°C vs 0°C to 70°C). LM385 parts maintain the original ±3% tolerance and narrower temperature range. Selection depends on application accuracy and temperature requirements.

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

A: Yes. Packaging format differences (Tube, Cut Tape & Digi-Reel, Tape & Reel) do not affect electrical performance. These variants represent different supply and handling formats for the same die and electrical specifications. Selection is based on procurement and assembly process requirements.

Q: Which substitute offers the best temperature stability?

A: LM285DR-2-5 and LM285DRG4-2-5 provide the lowest temperature coefficient (20ppm/°C typical) among available substitutes, combined with ±1.5% tolerance and -40°C to 85°C operating range. These parts are suitable for applications requiring maximum temperature stability.

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

A: Yes, with design verification. LM285 parts are pin-compatible and functionally equivalent. The improved tolerance (±1.5% vs ±3%) and extended temperature range provide enhanced performance. Verify that the application circuit does not depend on the specific temperature coefficient or tolerance of the original part.

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

A: Last Time Buy indicates the manufacturer will discontinue the part after a specified date. Parts with this status have limited availability windows. For long-term production, select parts with Active status such as LM385D-2.5G or LM285 series variants.

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