LM385BD-1.2R2 Equivalent & Substitute Parts

Part Overview

The LM385BD-1.2R2 is a shunt voltage reference IC manufactured by onsemi, delivering a fixed 1.235V output with ±1% 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 operates across a 0°C to 70°C temperature range with 20 mA output current capability and 80 ppm/°C temperature coefficient.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Type	Fixed
Voltage - Output (Min/Fixed)	1.235V
Current - Output	20 mA
Tolerance	±1%
Temperature Coefficient	80 ppm/°C Typical
Noise - 10Hz to 10kHz	60 µVrms
Current - Cathode	20 µA
Operating Temperature	0°C ~ 70°C (TA)
Mounting Type	Surface Mount
Package / Case	8-SOIC (0.154", 3.90mm Width)

Substitute Part Grouping Explanation

Substitution for the LM385BD-1.2R2 is determined by strict alignment of the following electrical and mechanical parameters:

Output Voltage: 1.235V fixed
Output Current: 20 mA
Tolerance: ±1%
Reference Type: Shunt
Package: 8-SOIC form factor
Mounting: Surface Mount

Substitute parts are categorized into two groups:

Direct Substitutes maintain identical electrical specifications and packaging, differing only in manufacturer, product status, or packaging format (tape & reel vs. bulk).

Similar Substitutes maintain core electrical parameters (voltage, current, tolerance, package) but may exhibit different temperature coefficients, cathode current specifications, or operating temperature ranges. These parts are functionally equivalent for the primary reference voltage function but require verification of secondary performance characteristics in specific applications.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Tolerance	Temp Coeff	Cathode Current	Operating Temp	Product Status	RoHS Status
LM385BD-1.2R2	onsemi	1.235V	20 mA	±1%	80 ppm/°C	20 µA	0°C ~ 70°C	Obsolete	RoHS non-compliant
LM385BD-1.2R2G	onsemi	1.235V	20 mA	±1%	80 ppm/°C	20 µA	0°C ~ 70°C	Active	ROHS3 Compliant
LM385BDR-1-2	Texas Instruments	1.235V	20 mA	±1%	20 ppm/°C	15 µA	0°C ~ 70°C	Last Time Buy	ROHS3 Compliant
LM285BXM-1.2/NOPB	National Semiconductor	1.235V	20 mA	±1%	30 ppm/°C	10 µA	-40°C ~ 85°C	Active	Not specified
LM285BXMX-1.2/NOPB	Texas Instruments	1.235V	20 mA	±1%	30 ppm/°C	10 µA	-40°C ~ 85°C	Active	ROHS3 Compliant
LM285BYM-1.2/NOPB	Texas Instruments	1.235V	20 mA	±1%	50 ppm/°C	10 µA	-40°C ~ 85°C	Active	ROHS3 Compliant
LM285BYMX-1.2/NOPB	Texas Instruments	1.235V	20 mA	±1%	50 ppm/°C	10 µA	-40°C ~ 85°C	Active	ROHS3 Compliant
LM285D-1-2	Texas Instruments	1.235V	20 mA	±1%	20 ppm/°C	10 µA	-40°C ~ 85°C	Last Time Buy	ROHS3 Compliant
LM285DG4-1-2	Texas Instruments	1.235V	20 mA	±1%	20 ppm/°C	10 µA	-40°C ~ 85°C	Obsolete	ROHS3 Compliant
LM285DR-1-2	Texas Instruments	1.235V	20 mA	±1%	20 ppm/°C	10 µA	-40°C ~ 85°C	Last Time Buy	ROHS3 Compliant
LM285DRE4-1-2	Texas Instruments	1.235V	20 mA	±1%	20 ppm/°C	10 µA	-40°C ~ 85°C	Obsolete	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: LM385BD-1.2R2G

The LM385BD-1.2R2G is the direct successor to the LM385BD-1.2R2. Manufactured by onsemi with identical electrical specifications and 8-SOIC packaging, this part maintains full compatibility while offering Active product status and ROHS3 compliance. The only difference is packaging format (Tape & Reel vs. bulk), making it the optimal choice for new designs and production continuity.

Secondary Recommendation: LM385BDR-1-2

The LM385BDR-1-2 from Texas Instruments provides an alternative with identical output voltage, current, and tolerance specifications. It features improved temperature coefficient performance (20 ppm/°C vs. 80 ppm/°C) and lower cathode current (15 µA vs. 20 µA), resulting in reduced power consumption. Product status is Last Time Buy, indicating limited availability. This part is suitable for applications where enhanced temperature stability is beneficial.

Tertiary Recommendations: LM285 Series

The LM285 series (LM285BXMX-1.2/NOPB, LM285BYM-1.2/NOPB, LM285BYMX-1.2/NOPB, LM285D-1-2, LM285DR-1-2) maintains identical output voltage, current, and tolerance specifications with 8-SOIC packaging. These parts feature extended operating temperature range (-40°C to 85°C) and lower cathode current (10 µA), providing superior performance in temperature-sensitive applications. All active variants carry ROHS3 compliance. Selection among LM285 variants depends on packaging requirements (tape & reel, tube, or cut tape) and temperature coefficient tolerance (20 ppm/°C to 50 ppm/°C).

Compliance Consideration:

The original LM385BD-1.2R2 is RoHS non-compliant. All recommended substitutes except LM285BXM-1.2/NOPB are ROHS3 compliant, supporting modern manufacturing and environmental standards.

Frequently Asked Questions (FAQ)

Q: Can LM385BD-1.2R2G be used as a direct replacement for LM385BD-1.2R2?

A: Yes. The LM385BD-1.2R2G is electrically and mechanically identical to the LM385BD-1.2R2, with the same 1.235V output, ±1% tolerance, 20 mA output current, and 8-SOIC package. The primary difference is product status (Active vs. Obsolete) and RoHS compliance (ROHS3 vs. non-compliant). Packaging format differs (Tape & Reel vs. bulk), but this does not affect circuit functionality.

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

A: Both series maintain the same 1.235V output voltage, ±1% tolerance, and 20 mA output current in 8-SOIC packages. The LM285 series offers extended operating temperature range (-40°C to 85°C vs. 0°C to 70°C) and lower cathode current (10 µA vs. 20 µA for LM385BD-1.2R2). Temperature coefficient varies by specific variant. LM285 parts are suitable for applications requiring wider temperature operation or reduced quiescent current.

Q: Why do some substitutes have different temperature coefficients?

A: Temperature coefficient variation reflects different manufacturing processes and die designs across manufacturers and product generations. The LM385BD-1.2R2 specifies 80 ppm/°C, while LM285 variants range from 20 ppm/°C to 50 ppm/°C. Lower temperature coefficients indicate better voltage stability across temperature extremes. Selection depends on application requirements for output voltage accuracy over temperature.

Q: Are all substitute parts available in the same package?

A: Yes. All listed substitutes use the 8-SOIC (0.154", 3.90mm Width) package, ensuring mechanical compatibility with existing PCB layouts. However, packaging format differs: some are supplied in Tape & Reel (TR), others in Cut Tape (CT) & Digi-Reel, Tube, or Bulk. Packaging format affects handling and assembly processes but not electrical performance or board-level compatibility.

Q: Which substitute offers the best long-term availability?

A: LM285BXMX-1.2/NOPB and LM285BYMX-1.2/NOPB from Texas Instruments carry Active product status with the highest inventory levels (3600 and 5200 units respectively). These parts are recommended for new designs requiring assured long-term supply. Parts marked Last Time Buy (LM385BDR-1-2, LM285D-1-2, LM285DR-1-2) have limited remaining availability.

Q: Can I use a substitute with a different operating temperature range?

A: Yes, if your application operates within the substitute's temperature range. The LM385BD-1.2R2 operates 0°C to 70°C. LM285 series parts extend to -40°C to 85°C, providing broader coverage. If your circuit operates only within 0°C to 70°C, either range is acceptable. If operation below 0°C or above 70°C is required, LM285 series parts are necessary.

Q: What does RoHS compliance mean for this component?

A: RoHS (Restriction of Hazardous Substances) compliance indicates the part contains no lead, cadmium, mercury, or other restricted materials. ROHS3 compliance is the current standard. The original LM385BD-1.2R2 is non-compliant, while most substitutes are ROHS3 compliant. For applications subject to environmental regulations or customer requirements, ROHS3 compliant parts are mandatory.

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