LM385D-1-2 Equivalent & Substitute Parts

Part Overview

The LM385D-1-2 is a shunt voltage reference IC manufactured by Texas Instruments, designed for precision voltage reference applications requiring a fixed 1.235V output. This Surface Mount device operates across the industrial temperature range of 0°C to 70°C and delivers 20 mA output current with ±2% tolerance. The part is classified as Last Time Buy, indicating end-of-life status. Equivalent and substitute parts are necessary to ensure design continuity, maintain supply chain flexibility, and access improved performance specifications where applicable.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Type	Fixed
Voltage - Output (Min/Fixed)	1.235V
Current - Output	20 mA
Tolerance	±2%
Noise - 10Hz to 10kHz	60µVrms
Current - Cathode	15 µA
Operating Temperature	0°C ~ 70°C (TA)
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 of the LM385D-1-2 is determined by the following critical parameters:

Electrical Compatibility Requirements:

Fixed output voltage of 1.235V
Output current capability of 20 mA
Shunt reference topology
Noise specification of 60µVrms (10Hz to 10kHz band)

Mechanical & Packaging Compatibility:

8-SOIC package format (0.154", 3.90mm Width)
Surface Mount technology

Tolerance & Performance Considerations:

Tolerance of ±2% or better (±1% substitutes provide improved accuracy)
Temperature coefficient specifications
Cathode current specifications

Compliance & Status:

ROHS3 compliance
MSL Level 1 (Unlimited moisture sensitivity)

Substitute parts are grouped into two categories: direct replacements maintaining the ±2% tolerance specification, and enhanced alternatives offering ±1% tolerance with extended temperature ranges (-40°C to 85°C). All substitutes maintain identical package geometry and electrical output characteristics.

Parameter Comparison

Part Number	Manufacturer	Tolerance	Temp Coefficient	Cathode Current	Operating Temp	Packaging	Product Status
LM385D-1-2	Texas Instruments	±2%	20ppm/°C	15 µA	0°C ~ 70°C	Tube	Last Time Buy
LM285BXM-1.2/NOPB	National Semiconductor	±1%	30ppm/°C	10 µA	-40°C ~ 85°C	Bulk	Active
LM285BXMX-1.2/NOPB	Texas Instruments	±1%	30ppm/°C	10 µA	-40°C ~ 85°C	Tape & Reel (TR)	Active
LM285BYM-1.2/NOPB	Texas Instruments	±1%	50ppm/°C	10 µA	-40°C ~ 85°C	Tube	Active
LM285BYMX-1.2/NOPB	Texas Instruments	±1%	50ppm/°C	10 µA	-40°C ~ 85°C	Tape & Reel (TR)	Active
LM285M-1.2/NOPB	Texas Instruments	±1%	150ppm/°C	10 µA	-40°C ~ 85°C	Tube	Active
LM285MX-1.2/NOPB	Texas Instruments	±1%	150ppm/°C	10 µA	-40°C ~ 85°C	Cut Tape (CT) & Digi-Reel®	Active
LM385BM-1.2/NOPB	Texas Instruments	±1%	150ppm/°C	15 µA	0°C ~ 70°C	Tube	Active
LM385BMX-1.2/NOPB	Texas Instruments	±1%	150ppm/°C	15 µA	0°C ~ 70°C	Tape & Reel (TR)	Active
LM385BXM-1.2/NOPB	National Semiconductor	±1%	30ppm/°C	15 µA	0°C ~ 70°C	Bulk	Active
LM385BXMX-1.2/NOPB	National Semiconductor	±1%	30ppm/°C	15 µA	0°C ~ 70°C	Bulk	Active

Engineering Selection Recommendations

Direct Replacement (Same Temperature Range & Cathode Current):

For applications requiring identical operating temperature specifications (0°C to 70°C) and cathode current (15 µA), select from the LM385 series substitutes: LM385BM-1.2/NOPB, LM385BMX-1.2/NOPB, LM385BXM-1.2/NOPB, or LM385BXMX-1.2/NOPB. These parts maintain the same thermal operating window as the LM385D-1-2 while offering improved ±1% tolerance. All are ROHS3 compliant and MSL Level 1 rated.

Enhanced Performance Substitutes (Extended Temperature Range):

For designs requiring extended operating temperature coverage (-40°C to 85°C), the LM285 series provides active product status with full ROHS3 compliance. These parts reduce cathode current to 10 µA, improving power efficiency. Selection within the LM285 series depends on temperature coefficient requirements: LM285BXM-1.2/NOPB and LM285BXMX-1.2/NOPB offer 30ppm/°C, while LM285BYM-1.2/NOPB, LM285BYMX-1.2/NOPB, LM285M-1.2/NOPB, and LM285MX-1.2/NOPB provide 50ppm/°C or 150ppm/°C specifications.

Packaging Considerations:

Tube packaging is suitable for manual assembly and lower-volume production. Tape & Reel (TR) packaging accommodates automated pick-and-place assembly. Bulk packaging requires manual handling and is appropriate for specific procurement workflows. Cut Tape (CT) & Digi-Reel® provides intermediate volume flexibility.

All substitute parts maintain ROHS3 compliance and MSL Level 1 rating, ensuring compatibility with standard manufacturing processes and storage conditions.

Frequently Asked Questions (FAQ)

Q: Can LM285 series parts directly replace the LM385D-1-2?

A: Yes, electrically. Both series deliver 1.235V fixed output at 20 mA with 60µVrms noise and identical 8-SOIC packaging. The LM285 series offers ±1% tolerance versus the LM385D-1-2's ±2%, and extends operating temperature to -40°C to 85°C. Cathode current differs (10 µA for LM285 versus 15 µA for LM385), which may affect circuit biasing in applications with tight current budgets.

Q: What is the difference between LM385BXM-1.2/NOPB and LM385BXMX-1.2/NOPB?

A: Both are National Semiconductor LM385 variants with ±1% tolerance and 30ppm/°C temperature coefficient. The primary difference is packaging: LM385BXM-1.2/NOPB is supplied in Bulk, while LM385BXMX-1.2/NOPB is supplied in Bulk as well. Verify specific packaging requirements with your procurement workflow.

Q: Which substitute offers the lowest temperature coefficient?

A: LM285BXM-1.2/NOPB and LM285BXMX-1.2/NOPB (National Semiconductor) and LM285BXMX-1.2/NOPB (Texas Instruments) all provide 30ppm/°C, the lowest among available substitutes. This specification is critical for applications requiring minimal voltage drift across temperature variations.

Q: Are all substitutes ROHS3 compliant?

A: All listed substitute parts are ROHS3 compliant and MSL Level 1 rated, ensuring compatibility with standard manufacturing and storage protocols.

Q: What packaging should I select for automated assembly?

A: Tape & Reel (TR) packaging is standard for automated pick-and-place assembly. Options include LM285BXMX-1.2/NOPB, LM285BYMX-1.2/NOPB, LM285MX-1.2/NOPB, LM385BMX-1.2/NOPB, and LM385BXMX-1.2/NOPB (National Semiconductor variant).

Q: Can I use LM285 parts in designs originally specified for LM385D-1-2?

A: Yes, provided your circuit accommodates the reduced cathode current (10 µA versus 15 µA) and extended temperature range does not introduce unintended behavior. The ±1% tolerance improvement is generally beneficial. Verify bias network calculations if cathode current is a design constraint.

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