LM385D-1.2 Equivalent & Substitute Parts

Part Overview

The LM385D-1.2 is a shunt voltage reference IC manufactured by onsemi, providing a fixed 1.235V output with ±2.4%/+2.01% tolerance. This component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design support and procurement. The LM385D-1.2 operates in the 0°C to 70°C temperature range and is packaged in 8-SOIC surface mount configuration with 20 mA output current capability.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Type	Fixed
Voltage - Output (Min/Fixed)	1.235V
Current - Output	20 mA
Tolerance	-2.4%, +2.01%
Temperature Coefficient	80ppm/°C Typical
Noise - 10Hz to 10kHz	60µVrms
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
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the LM385D-1.2 is determined by the following critical parameters:

Output Voltage: Must be 1.235V fixed
Package Type: Must be 8-SOIC surface mount
Output Current: Must support 20 mA
Reference Type: Must be shunt configuration
Mounting Type: Must be surface mount

Substitute parts are grouped into two categories:

Direct Equivalents maintain identical electrical specifications and package configuration, differing only in manufacturer or product status designation.

Similar Alternatives provide the same 1.235V output and 8-SOIC package but may feature improved tolerance specifications (±1% to ±2%), lower temperature coefficients, extended operating temperature ranges (-40°C to 85°C), or reduced cathode current (10 µA vs. 20 µA). These alternatives are electrically compatible and mechanically interchangeable.

Parameter Comparison

Part Number	Manufacturer	Voltage Output	Tolerance	Temp Coeff	Cathode Current	Operating Temp	Package	Product Status	RoHS Status
LM385D-1.2	onsemi	1.235V	-2.4%, +2.01%	80ppm/°C	20 µA	0°C ~ 70°C	8-SOIC	Obsolete	RoHS non-compliant
LM385D-1.2G	onsemi	1.235V	-2.4%, +2.01%	80ppm/°C	20 µA	0°C ~ 70°C	8-SOIC	Active	ROHS3 Compliant
LM385D-1-2	Texas Instruments	1.235V	±2%	20ppm/°C	15 µA	0°C ~ 70°C	8-SOIC	Last Time Buy	ROHS3 Compliant
LM285BXM-1.2/NOPB	National Semiconductor	1.235V	±1%	30ppm/°C	10 µA	-40°C ~ 85°C	8-SOIC	Active	Not specified
LM285BXMX-1.2/NOPB	Texas Instruments	1.235V	±1%	30ppm/°C	10 µA	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
LM285BYM-1.2/NOPB	Texas Instruments	1.235V	±1%	50ppm/°C	10 µA	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
LM285BYMX-1.2/NOPB	Texas Instruments	1.235V	±1%	50ppm/°C	10 µA	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
LM285D-1-2	Texas Instruments	1.235V	±1%	20ppm/°C	10 µA	-40°C ~ 85°C	8-SOIC	Last Time Buy	ROHS3 Compliant
LM285DG4-1-2	Texas Instruments	1.235V	±1%	20ppm/°C	10 µA	-40°C ~ 85°C	8-SOIC	Obsolete	ROHS3 Compliant
LM285DR-1-2	Texas Instruments	1.235V	±1%	20ppm/°C	10 µA	-40°C ~ 85°C	8-SOIC	Last Time Buy	ROHS3 Compliant
LM285DRE4-1-2	Texas Instruments	1.235V	±1%	20ppm/°C	10 µA	-40°C ~ 85°C	8-SOIC	Obsolete	ROHS3 Compliant

Engineering Selection Recommendations

For RoHS3 Compliance Requirements: LM385D-1.2G (onsemi) is the direct equivalent with active product status and ROHS3 compliance. This part maintains identical electrical specifications and 8-SOIC packaging while providing regulatory compliance for new designs.

For Extended Temperature Range Applications: LM285 series parts (LM285BXMX-1.2/NOPB, LM285BYM-1.2/NOPB, LM285BYMX-1.2/NOPB, LM285D-1-2, LM285DR-1-2) operate across -40°C to 85°C and feature improved tolerance specifications (±1%) compared to the original LM385D-1.2 (-2.4%, +2.01%). All LM285 variants are ROHS3 compliant and actively supported or available as Last Time Buy inventory.

For Immediate Procurement with Active Status: LM285BXMX-1.2/NOPB and LM285BYMX-1.2/NOPB (Texas Instruments) offer the highest inventory availability (3600 and 5200 units respectively) with active product status, ±1% tolerance, and ROHS3 compliance.

For Legacy System Maintenance: LM385D-1-2 (Texas Instruments) provides the closest specification match to the original LM385D-1.2 with ±2% tolerance and Last Time Buy status, suitable for direct replacement in existing designs.

Frequently Asked Questions (FAQ)

Q: Can LM285 series parts directly replace the LM385D-1.2? A: Yes. Both LM385 and LM285 series are shunt voltage reference ICs with identical 1.235V output, 20 mA output current, and 8-SOIC packaging. LM285 variants offer improved tolerance (±1% vs. -2.4%/+2.01%), lower temperature coefficients, and extended operating temperature ranges (-40°C to 85°C vs. 0°C to 70°C).

Q: What is the difference between LM385D-1.2 and LM385D-1.2G? A: LM385D-1.2G is the active equivalent manufactured by onsemi with identical electrical specifications. The primary difference is product status (Active vs. Obsolete) and RoHS compliance (ROHS3 Compliant vs. RoHS non-compliant). Both use 8-SOIC packaging and deliver 1.235V output.

Q: Are packaging differences between tube and tape & reel significant for substitution? A: Packaging format (tube, tape & reel, cut tape) affects procurement and handling but does not impact electrical compatibility. The critical parameter is the 8-SOIC package type, which is consistent across all listed substitutes. Packaging selection depends on assembly process requirements and volume.

Q: Which substitute offers the best long-term availability? A: LM285BXMX-1.2/NOPB and LM285BYMX-1.2/NOPB (Texas Instruments) maintain active product status with substantial inventory (3600 and 5200 units). These parts feature ROHS3 compliance, ±1% tolerance, and extended temperature range support.

Q: Can I use LM285 parts in designs originally specified for LM385D-1.2? A: Yes. The LM285 series is electrically and mechanically compatible. The improved tolerance (±1%) and lower temperature coefficient provide superior performance. Verify that your circuit design does not depend on the specific tolerance band of the original LM385D-1.2 (-2.4%, +2.01%).

Q: What is the significance of cathode current differences (20 µA vs. 10 µA)? A: Lower cathode current in LM285 variants (10 µA) reduces power consumption and heat generation compared to the LM385D-1.2 (20 µA). This is a beneficial characteristic for battery-powered or thermally constrained applications and does not prevent substitution.

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