LM385BD-1-2 Equivalent & Substitute Parts

Part Overview

The LM385BD-1-2 is a shunt voltage reference integrated circuit manufactured by Texas Instruments, classified as a Power Management (PMIC) component. This device generates a fixed 1.235V output with ±1% tolerance and is housed in an 8-SOIC surface mount package. The part is currently listed as obsolete, necessitating identification of active equivalent and substitute components for ongoing design support and procurement continuity. Substitute parts maintain identical electrical specifications while offering extended temperature ranges and improved availability through active product status.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Type	Fixed
Voltage - Output (Min/Fixed)	1.235V
Current - Output	20 mA
Tolerance	±1%
Noise - 10Hz to 10kHz	60µVrms
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the LM385BD-1-2 is determined by strict adherence to the following electrical and mechanical parameters:

Core Substitution Criteria:

Reference Type: Shunt
Output Type: Fixed
Voltage - Output: 1.235V
Current - Output: 20 mA
Tolerance: ±1%
Noise - 10Hz to 10kHz: 60µVrms
Package / Case: 8-SOIC (0.154", 3.90mm Width)
Mounting Type: Surface Mount

Variable Parameters Allowing Substitution:

Temperature Coefficient (20ppm/°C to 150ppm/°C)
Operating Temperature Range (0°C ~ 70°C or -40°C ~ 85°C)
Current - Cathode (10µA or 15µA)
Packaging Format (Tube, Bulk, Tape & Reel, Cut Tape)
Product Status (Active substitutes for Obsolete)
Manufacturer (Texas Instruments or National Semiconductor)

All substitute parts listed maintain identical core electrical performance while offering variations in thermal stability and operating temperature ranges suitable for different application requirements.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage Output	Current Output	Tolerance	Temp Coefficient	Operating Temp	Current Cathode	Package	Packaging Format
LM385BD-1-2	Texas Instruments	Obsolete	1.235V	20 mA	±1%	20ppm/°C	0°C ~ 70°C	15µA	8-SOIC	Tube
LM285BXM-1.2/NOPB	National Semiconductor	Active	1.235V	20 mA	±1%	30ppm/°C	-40°C ~ 85°C	10µA	8-SOIC	Bulk
LM285BXMX-1.2/NOPB	Texas Instruments	Active	1.235V	20 mA	±1%	30ppm/°C	-40°C ~ 85°C	10µA	8-SOIC	Tape & Reel
LM285BYM-1.2/NOPB	Texas Instruments	Active	1.235V	20 mA	±1%	50ppm/°C	-40°C ~ 85°C	10µA	8-SOIC	Tube
LM285BYMX-1.2/NOPB	Texas Instruments	Active	1.235V	20 mA	±1%	50ppm/°C	-40°C ~ 85°C	10µA	8-SOIC	Tape & Reel
LM285M-1.2/NOPB	Texas Instruments	Active	1.235V	20 mA	±1%	150ppm/°C	-40°C ~ 85°C	10µA	8-SOIC	Tube
LM285MX-1.2/NOPB	Texas Instruments	Active	1.235V	20 mA	±1%	150ppm/°C	-40°C ~ 85°C	10µA	8-SOIC	Cut Tape & Digi-Reel
LM385BM-1.2/NOPB	Texas Instruments	Active	1.235V	20 mA	±1%	150ppm/°C	0°C ~ 70°C	15µA	8-SOIC	Tube
LM385BMX-1.2/NOPB	Texas Instruments	Active	1.235V	20 mA	±1%	150ppm/°C	0°C ~ 70°C	15µA	8-SOIC	Tape & Reel
LM385BXM-1.2/NOPB	National Semiconductor	Active	1.235V	20 mA	±1%	30ppm/°C	0°C ~ 70°C	15µA	8-SOIC	Bulk
LM385BXMX-1.2/NOPB	National Semiconductor	Active	1.235V	20 mA	±1%	30ppm/°C	0°C ~ 70°C	15µA	8-SOIC	Bulk

Engineering Selection Recommendations

For Direct Replacement (Identical Operating Temperature Range):

Select LM385BM-1.2/NOPB or LM385BMX-1.2/NOPB when operating temperature requirements remain within 0°C ~ 70°C. These parts maintain identical cathode current (15µA) and temperature range as the original LM385BD-1-2. Both are active products with ROHS3 compliance and unlimited moisture sensitivity rating. Choose the Tube packaging (LM385BM-1.2/NOPB) for manual assembly or Tape & Reel format (LM385BMX-1.2/NOPB) for automated production.

For Extended Temperature Range Applications:

Select LM285BXMX-1.2/NOPB or LM285BYMX-1.2/NOPB when designs require operation across -40°C ~ 85°C. Both are active Texas Instruments products in Tape & Reel packaging with ROHS3 compliance. LM285BXMX-1.2/NOPB offers superior temperature stability (30ppm/°C) compared to LM285BYMX-1.2/NOPB (50ppm/°C). Both reduce cathode current to 10µA.

For Bulk Packaging Requirements:

LM385BXM-1.2/NOPB (National Semiconductor) or LM385BXMX-1.2/NOPB (National Semiconductor) provide bulk packaging options while maintaining 0°C ~ 70°C operating range and 30ppm/°C temperature coefficient. Both are active products with identical electrical specifications to the original part.

Compliance Verification:

All recommended substitutes maintain ROHS3 compliance, EAR99 export classification, and unlimited moisture sensitivity rating (MSL 1). No additional qualification testing is required based on provided compliance certifications.

Frequently Asked Questions (FAQ)

Q: Can LM285 series parts directly replace LM385 series parts?

A: Yes, when electrical specifications match. Both LM285 and LM385 series maintain identical 1.235V output, ±1% tolerance, 20mA output current, and 8-SOIC packaging. Differences exist in temperature coefficient and operating temperature range. Verify your application's temperature requirements before selection.

Q: What is the difference between Tube, Bulk, and Tape & Reel packaging?

A: Tube packaging contains components in plastic tubes suitable for manual handling and small-volume assembly. Bulk packaging provides loose components for high-volume operations. Tape & Reel format winds components on carrier tape for automated pick-and-place equipment. Select based on your assembly process requirements.

Q: Why do substitute parts show lower cathode current (10µA vs 15µA)?

A: Lower cathode current in LM285 series represents improved power efficiency while maintaining identical output specifications. This variation is permitted within substitution criteria and does not affect circuit functionality for standard applications.

Q: What does temperature coefficient (ppm/°C) mean for this application?

A: Temperature coefficient indicates output voltage drift per degree Celsius change. The original LM385BD-1-2 exhibits 20ppm/°C drift. Substitute parts range from 30ppm/°C to 150ppm/°C. Lower values indicate better thermal stability. Select based on your circuit's temperature compensation requirements.

Q: Is the extended temperature range (-40°C ~ 85°C) backward compatible with 0°C ~ 70°C designs?

A: Yes. Parts rated for -40°C ~ 85°C operation function correctly within 0°C ~ 70°C ranges. Extended range parts provide additional design margin for future applications without circuit modification.

Q: Are National Semiconductor and Texas Instruments parts interchangeable?

A: Yes, when part numbers and electrical specifications match. Both manufacturers produce equivalent LM385 and LM285 series components with identical output voltage, tolerance, and package specifications. Verify product status and availability before procurement.

Q: What does ROHS3 compliance indicate?

A: ROHS3 compliance certifies the component meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. All listed substitutes maintain this compliance standard.

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