LM385BDR-2-5 Equivalent & Substitute Parts

Part Overview

The LM385BDR-2-5 is a shunt voltage reference IC manufactured by Texas Instruments, delivering a fixed 2.5V output with ±1.5% tolerance. This Surface Mount device in 8-SOIC packaging is designed for precision voltage reference applications requiring stable output across operating conditions. The part is currently in Last Time Buy status, making identification of active equivalent alternatives essential for ongoing design support and procurement planning.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM385BDR-2-5
Manufacturer	Texas Instruments
Reference Type	Shunt
Output Voltage (Fixed)	2.5V
Output Current	20 mA
Tolerance	±1.5%
Temperature Coefficient	20 ppm/°C Typical
Noise (10Hz to 10kHz)	120 µVrms
Cathode Current	20 µA
Operating Temperature Range	0°C to 70°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Packaging Format	Tape & Reel (TR)
Product Status	Last Time Buy
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the LM385BDR-2-5 is determined by strict equivalence across the following critical parameters:

Fixed Electrical Requirements:

Output voltage: 2.5V fixed
Output current: 20 mA
Tolerance: ±1.5%
Noise specification: 120 µVrms (10Hz to 10kHz)
Cathode current: 20 µA
Package: 8-SOIC (0.154", 3.90mm Width)
Mounting type: Surface Mount
Reference type: Shunt

Variable Parameters Allowing Substitution:

Temperature coefficient (20 ppm/°C to 150 ppm/°C acceptable)
Operating temperature range (0°C to 70°C or -40°C to 85°C)
Packaging format (Tube, Cut Tape & Digi-Reel, Tape & Reel)
Product status (Active preferred over Last Time Buy)

Substitute parts must maintain identical electrical output specifications and physical package dimensions. Temperature coefficient variation and extended operating range are acceptable where application requirements permit. Packaging format differences accommodate different procurement and assembly workflows without affecting functional performance.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Tolerance	Temp Coeff (ppm/°C)	Operating Temp Range	Packaging Format	Product Status
LM385BDR-2-5	Texas Instruments	2.5V	20 mA	±1.5%	20	0°C to 70°C	Tape & Reel	Last Time Buy
LM285BXM-2.5/NOPB	Texas Instruments	2.5V	20 mA	±1.5%	30	-40°C to 85°C	Tube	Active
LM285BXMX-2.5/NOPB	Texas Instruments	2.5V	20 mA	±1.5%	30	-40°C to 85°C	Cut Tape & Digi-Reel	Active
LM285BYM-2.5/NOPB	Texas Instruments	2.5V	20 mA	±1.5%	50	-40°C to 85°C	Tube	Active
LM285BYMX-2.5/NOPB	Texas Instruments	2.5V	20 mA	±1.5%	50	-40°C to 85°C	Tape & Reel	Active
LM285M-2.5/NOPB	Texas Instruments	2.5V	20 mA	±1.5%	150	-40°C to 85°C	Tube	Active
LM285MX-2.5/NOPB	Texas Instruments	2.5V	20 mA	±1.5%	150	-40°C to 85°C	Cut Tape & Digi-Reel	Active
LM385BM-2.5/NOPB	National Semiconductor	2.5V	20 mA	±1.5%	150	0°C to 70°C	Bulk	Active
LM385BMX-2.5/NOPB	Texas Instruments	2.5V	20 mA	±1.5%	150	0°C to 70°C	Tape & Reel	Active
LM385BXM-2.5/NOPB	Texas Instruments	2.5V	20 mA	±1.5%	30	0°C to 70°C	Tube	Active
LM385BXMX-2.5/NOPB	Texas Instruments	2.5V	20 mA	±1.5%	30	0°C to 70°C	Tape & Reel	Active

Engineering Selection Recommendations

Primary Substitutes (Matched Temperature Range):

LM385BMX-2.5/NOPB and LM385BXMX-2.5/NOPB maintain the original 0°C to 70°C operating range while offering Active product status. Both are available in Tape & Reel packaging. LM385BMX-2.5/NOPB provides 150 ppm/°C temperature coefficient; LM385BXMX-2.5/NOPB provides 30 ppm/°C for applications requiring tighter thermal stability.

Extended Temperature Range Substitutes:

LM285 series parts (LM285BXM-2.5/NOPB, LM285BXMX-2.5/NOPB, LM285BYM-2.5/NOPB, LM285BYMX-2.5/NOPB, LM285M-2.5/NOPB, LM285MX-2.5/NOPB) operate across -40°C to 85°C and carry Active status. These are suitable for applications requiring extended temperature performance. Temperature coefficient ranges from 30 ppm/°C to 150 ppm/°C depending on grade selection.

Compliance & Certification:

All recommended substitutes maintain ROHS3 compliance and Moisture Sensitivity Level 1 (Unlimited) matching the original part. All are manufactured by Texas Instruments except LM385BM-2.5/NOPB (National Semiconductor). All carry REACH Unaffected status and EAR99 export classification.

Frequently Asked Questions (FAQ)

Q: Can LM285 series parts directly replace LM385BDR-2-5?

A: Yes, provided the application tolerates the extended operating temperature range (-40°C to 85°C versus 0°C to 70°C) and higher temperature coefficient values. All electrical output specifications remain identical: 2.5V fixed output, 20 mA current, ±1.5% tolerance, 120 µVrms noise, and 8-SOIC package.

Q: What is the significance of temperature coefficient differences?

A: Temperature coefficient indicates output voltage drift per degree Celsius. The original LM385BDR-2-5 specifies 20 ppm/°C. Substitutes range from 30 ppm/°C to 150 ppm/°C. Lower coefficients (30 ppm/°C) provide better thermal stability; higher coefficients (150 ppm/°C) are acceptable where application voltage tolerance budgets accommodate greater drift.

Q: Are packaging format differences functionally significant?

A: No. Tube, Cut Tape & Digi-Reel, and Tape & Reel formats contain identical die and electrical performance. Format selection depends on assembly line equipment and procurement workflow. All maintain 8-SOIC (0.154", 3.90mm Width) physical dimensions.

Q: Why is the original part Last Time Buy?

A: Last Time Buy status indicates the manufacturer is discontinuing production. Active substitutes ensure long-term design support and procurement availability. LM385 and LM285 series parts from Texas Instruments provide equivalent functionality with confirmed ongoing production.

Q: Can I use LM385BM-2.5/NOPB in Bulk packaging?

A: LM385BM-2.5/NOPB is electrically equivalent but supplied in Bulk packaging rather than Tape & Reel. Bulk format requires manual handling and is typically unsuitable for automated assembly. Tape & Reel variants (LM385BMX-2.5/NOPB, LM385BXMX-2.5/NOPB) are recommended for production environments.

Q: What is the difference between LM385 and LM285 base product numbers?

A: Both are shunt voltage reference ICs with identical 2.5V output and electrical specifications. LM285 series offers extended temperature range (-40°C to 85°C) and Active product status. LM385 series matches the original operating range (0°C to 70°C). Selection depends on application temperature requirements.

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