LM385BD-2-5 Equivalent & Substitute Parts

Part Overview

The LM385BD-2-5 is a shunt voltage reference IC manufactured by Texas Instruments, designed for precision voltage reference applications requiring a fixed 2.5V output. This component operates as a micropower voltage reference with ±1.5% tolerance and is packaged in an 8-SOIC surface mount configuration. The part is currently in Last Time Buy status, making identification of active equivalent and substitute parts essential for design continuity and procurement planning.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Type	Fixed
Voltage - Output (Min/Fixed)	2.5V
Current - Output	20 mA
Tolerance	±1.5%
Noise - 10Hz to 10kHz	120µVrms
Current - Cathode	20 µA
Operating Temperature	0°C ~ 70°C
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 LM385BD-2-5 is determined by the following critical parameters:

Electrical Compatibility Requirements:

Fixed output voltage of 2.5V
Output current capability of 20 mA
Tolerance of ±1.5% (or tighter)
Noise specification of 120µVrms (10Hz to 10kHz)
Cathode current of 20 µA
Shunt reference type

Mechanical & Environmental Compatibility:

8-SOIC package (0.154", 3.90mm Width)
Surface mount mounting type
Operating temperature range of 0°C ~ 70°C (or extended range)
ROHS3 compliance
MSL rating of 1 (Unlimited)

Substitute parts must maintain identical electrical specifications and package form factor. Temperature coefficient variations are acceptable when operating temperature range remains within or exceeds the original specification. Parts with extended temperature ranges (-40°C ~ 85°C) are compatible for applications within the 0°C ~ 70°C window.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage Output	Tolerance	Temp Coeff	Operating Temp	Package	Packaging Type
LM385BD-2-5	Texas Instruments	Last Time Buy	2.5V	±1.5%	20ppm/°C	0°C ~ 70°C	8-SOIC	Tube
LM285M-2.5/NOPB	Texas Instruments	Active	2.5V	±1.5%	150ppm/°C	-40°C ~ 85°C	8-SOIC	Tube
LM285MX-2.5/NOPB	Texas Instruments	Active	2.5V	±1.5%	150ppm/°C	-40°C ~ 85°C	8-SOIC	Cut Tape (CT) & Digi-Reel®
LM385BM-2.5/NOPB	National Semiconductor	Active	2.5V	±1.5%	150ppm/°C	0°C ~ 70°C	8-SOIC	Bulk
LM385BMX-2.5/NOPB	Texas Instruments	Active	2.5V	±1.5%	150ppm/°C	0°C ~ 70°C	8-SOIC	Tape & Reel (TR)
LM385BXM-2.5/NOPB	Texas Instruments	Active	2.5V	±1.5%	30ppm/°C	0°C ~ 70°C	8-SOIC	Tube
LM385BXMX-2.5/NOPB	Texas Instruments	Active	2.5V	±1.5%	30ppm/°C	0°C ~ 70°C	8-SOIC	Tape & Reel (TR)
LM385BYM-2.5/NOPB	Texas Instruments	Active	2.5V	±1.5%	50ppm/°C	0°C ~ 70°C	8-SOIC	Tube
LM385BYMX-2.5/NOPB	Texas Instruments	Active	2.5V	±1.5%	50ppm/°C	0°C ~ 70°C	8-SOIC	Tape & Reel (TR)

Engineering Selection Recommendations

Primary Substitutes (Identical Operating Temperature Range):

LM385BXM-2.5/NOPB and LM385BXMX-2.5/NOPB are direct substitutes with matching 0°C ~ 70°C operating temperature range and superior temperature coefficient performance (30ppm/°C). Both maintain ROHS3 compliance and MSL 1 rating. Selection between tube (LM385BXM-2.5/NOPB) and tape & reel (LM385BXMX-2.5/NOPB) packaging depends on procurement and assembly requirements.

LM385BYM-2.5/NOPB and LM385BYMX-2.5/NOPB provide equivalent substitution with 50ppm/°C temperature coefficient, suitable for applications where thermal stability is less critical than cost or availability.

LM385BMX-2.5/NOPB offers tape & reel packaging in an active product status with matching electrical and thermal specifications.

Extended Temperature Range Alternatives:

LM285M-2.5/NOPB and LM285MX-2.5/NOPB extend the operating temperature range to -40°C ~ 85°C while maintaining ±1.5% tolerance and 120µVrms noise specification. These parts are suitable for applications requiring operation beyond the original 0°C ~ 70°C window.

Compliance & Availability:

All recommended substitutes maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating. LM385BM-2.5/NOPB, manufactured by National Semiconductor, provides an alternative source while maintaining electrical equivalence.

Frequently Asked Questions (FAQ)

Q: Can LM285M-2.5/NOPB replace LM385BD-2-5 in designs operating only within 0°C ~ 70°C?

A: Yes. LM285M-2.5/NOPB maintains identical electrical specifications (2.5V output, ±1.5% tolerance, 20 mA output current, 120µVrms noise) and 8-SOIC package form factor. The extended temperature range (-40°C ~ 85°C) does not affect operation within the narrower 0°C ~ 70°C window.

Q: What is the difference between tube and tape & reel packaging options?

A: Tube packaging (LM385BXM-2.5/NOPB, LM385BYM-2.5/NOPB) is suitable for lower-volume applications and manual assembly. Tape & reel packaging (LM385BXMX-2.5/NOPB, LM385BYMX-2.5/NOPB) is optimized for automated pick-and-place assembly and higher-volume production. Electrical performance is identical.

Q: Are there tolerance differences between substitute parts?

A: All recommended substitutes maintain ±1.5% tolerance matching the original LM385BD-2-5 specification. LM385M-2.5/NOPB and LM385MX-2.5/NOPB have ±3% tolerance and are not recommended as direct substitutes for applications requiring ±1.5% accuracy.

Q: How do temperature coefficient variations affect circuit performance?

A: Temperature coefficient differences (20ppm/°C, 30ppm/°C, 50ppm/°C, 150ppm/°C) determine voltage drift over the operating temperature range. Lower coefficients provide better thermal stability. Within the 0°C ~ 70°C operating window, all ±1.5% tolerance parts maintain specification compliance regardless of temperature coefficient value.

Q: Is the LM385BM-2.5/NOPB (National Semiconductor) equivalent to the Texas Instruments LM385BD-2-5?

A: Yes. LM385BM-2.5/NOPB provides electrical and package equivalence with identical 2.5V output, ±1.5% tolerance, 20 mA output current, and 8-SOIC package. It represents an alternative manufacturer source while maintaining full compatibility.

Q: What does "Last Time Buy" status mean for the LM385BD-2-5?

A: Last Time Buy indicates the manufacturer will discontinue production. Active substitute parts listed in this document provide continuity for new designs and ongoing production requirements.

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