LM385BD-2.5 Equivalent & Substitute Parts

Part Overview

The LM385BD-2.5 is a shunt voltage reference IC manufactured by onsemi, delivering a fixed 2.5V output with ±1.5% tolerance. This 8-SOIC surface mount device operates across 0°C to 70°C and is classified as obsolete. Due to its obsolete status and limited operating temperature range, direct substitutes with active product status and extended temperature specifications are necessary for new designs and long-term supply chain continuity.

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	30 µA
Operating Temperature	0°C ~ 70°C (TA)
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following mandatory parameters:

Output Voltage: Must be 2.5V fixed
Output Current: Must be 20 mA
Tolerance: Must be ±1.5%
Noise Specification: Must be 120µVrms (10Hz to 10kHz)
Package: Must be 8-SOIC (0.154", 3.90mm Width)
Mounting Type: Must be Surface Mount
Reference Type: Must be Shunt

Substitute parts are categorized as follows:

Direct Substitutes (identical electrical and mechanical specifications, differing only in packaging or manufacturer):

LM385BD-2.5G (onsemi, Active status, Tube packaging)
LM385BD-2-5 (Texas Instruments, Last Time Buy status, Tube packaging)

Similar Substitutes (meet all core electrical parameters but differ in temperature coefficient, operating temperature range, or cathode current):

LM285BXM-2.5/NOPB (Texas Instruments, -40°C to 85°C operating range)
LM285BXMX-2.5/NOPB (Texas Instruments, -40°C to 85°C operating range)
LM285BYM-2.5/NOPB (Texas Instruments, -40°C to 85°C operating range)
LM285BYMX-2.5/NOPB (Texas Instruments, -40°C to 85°C operating range)
LM285DR-2-5 (Texas Instruments, Last Time Buy status, -40°C to 85°C operating range)
LM285DRG4-2-5 (Texas Instruments, Obsolete status, -40°C to 85°C operating range)
LM285M-2.5/NOPB (Texas Instruments, Active status, -40°C to 85°C operating range)
LM285MX-2.5/NOPB (Texas Instruments, Active status, -40°C to 85°C operating range)

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage Output	Current Output	Tolerance	Temp Coeff (ppm/°C)	Cathode Current	Operating Temp	Package	RoHS Status
LM385BD-2.5	onsemi	Obsolete	2.5V	20 mA	±1.5%	80	30 µA	0°C ~ 70°C	8-SOIC	Non-compliant
LM385BD-2.5G	onsemi	Active	2.5V	20 mA	±1.5%	80	30 µA	0°C ~ 70°C	8-SOIC	ROHS3 Compliant
LM385BD-2-5	Texas Instruments	Last Time Buy	2.5V	20 mA	±1.5%	20	20 µA	0°C ~ 70°C	8-SOIC	ROHS3 Compliant
LM285BXM-2.5/NOPB	Texas Instruments	Active	2.5V	20 mA	±1.5%	30	20 µA	-40°C ~ 85°C	8-SOIC	ROHS3 Compliant
LM285BXMX-2.5/NOPB	Texas Instruments	Active	2.5V	20 mA	±1.5%	30	20 µA	-40°C ~ 85°C	8-SOIC	ROHS3 Compliant
LM285BYM-2.5/NOPB	Texas Instruments	Active	2.5V	20 mA	±1.5%	50	20 µA	-40°C ~ 85°C	8-SOIC	ROHS3 Compliant
LM285BYMX-2.5/NOPB	Texas Instruments	Active	2.5V	20 mA	±1.5%	50	20 µA	-40°C ~ 85°C	8-SOIC	ROHS3 Compliant
LM285DR-2-5	Texas Instruments	Last Time Buy	2.5V	20 mA	±1.5%	20	20 µA	-40°C ~ 85°C	8-SOIC	ROHS3 Compliant
LM285DRG4-2-5	Texas Instruments	Obsolete	2.5V	20 mA	±1.5%	20	20 µA	-40°C ~ 85°C	8-SOIC	ROHS3 Compliant
LM285M-2.5/NOPB	Texas Instruments	Active	2.5V	20 mA	±1.5%	150	20 µA	-40°C ~ 85°C	8-SOIC	ROHS3 Compliant
LM285MX-2.5/NOPB	Texas Instruments	Active	2.5V	20 mA	±1.5%	150	20 µA	-40°C ~ 85°C	8-SOIC	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Identical Operating Temperature Range):

LM385BD-2.5G is the primary direct substitute. It maintains the original 0°C to 70°C operating temperature range and identical electrical specifications while offering Active product status and ROHS3 compliance. This part is suitable for designs requiring no thermal specification changes.

LM385BD-2-5 (Texas Instruments) provides an alternative direct substitute with identical temperature range. However, it carries Last Time Buy status, indicating limited future availability.

For Extended Temperature Range Applications:

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) extend the operating temperature range to -40°C to 85°C. These are suitable for applications requiring wider temperature operation. All carry Active product status and ROHS3 compliance.

LM285DR-2-5 offers extended temperature range with Last Time Buy status, limiting long-term supply viability.

Compliance Considerations:

All substitute parts except the original LM385BD-2.5 are ROHS3 compliant. The original part is RoHS non-compliant. For new designs subject to RoHS regulations, LM385BD-2.5G or LM285 series parts are required.

Packaging and Availability:

Packaging variants (Tube, Cut Tape & Digi-Reel, Tape & Reel) are available across the substitute range. Selection depends on manufacturing process requirements and volume.

Frequently Asked Questions (FAQ)

Q: Can LM285 series parts directly replace the LM385BD-2.5?

A: LM285 series parts meet all core electrical specifications (2.5V output, 20 mA, ±1.5% tolerance, 120µVrms noise). However, they differ in operating temperature range (-40°C to 85°C versus 0°C to 70°C) and temperature coefficient. They are electrically compatible but require thermal specification review for your application.

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

A: Both are 2.5V shunt voltage reference ICs in 8-SOIC packages with identical output specifications. The LM285 series offers extended operating temperature range (-40°C to 85°C) and lower cathode current (20 µA versus 30 µA for LM385BD-2.5). Temperature coefficient varies by grade within each series.

Q: Why is LM385BD-2.5G preferred over LM385BD-2-5?

A: LM385BD-2.5G maintains Active product status with ongoing manufacturer support, while LM385BD-2-5 is Last Time Buy, indicating limited future availability. Both are electrically identical with 0°C to 70°C operating range.

Q: Are all substitute parts RoHS compliant?

A: All substitute parts listed are ROHS3 compliant. The original LM385BD-2.5 is RoHS non-compliant. For applications requiring RoHS compliance, substitute parts are mandatory.

Q: Does packaging type affect electrical performance?

A: No. Tube, Cut Tape & Digi-Reel, and Tape & Reel packaging variants contain identical die and electrical specifications. Packaging selection is determined by manufacturing process and volume requirements only.

Q: What is the significance of temperature coefficient differences?

A: Temperature coefficient indicates voltage drift with temperature. Lower values (20 ppm/°C) provide better stability across temperature ranges. The original LM385BD-2.5 has 80 ppm/°C. LM285 series parts range from 30 to 150 ppm/°C depending on grade. Application thermal stability requirements determine acceptable values.

Q: Can I use LM285M-2.5/NOPB in place of LM385BD-2.5 in a 0°C to 70°C application?

A: Yes. LM285M-2.5/NOPB operates across -40°C to 85°C, which encompasses the 0°C to 70°C range. All electrical specifications are met. The extended temperature capability introduces no compatibility issues for narrower temperature applications.

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