LM385BXM-2.5/NOPB Equivalent & Substitute Parts

Part Overview

The LM385BXM-2.5/NOPB is a shunt voltage reference IC manufactured by Texas Instruments, delivering a fixed 2.5V output with ±1.5% tolerance. This surface-mount component operates across 0°C to 70°C and is housed in an 8-SOIC package. The part is currently active in production. Substitute parts are necessary when the original packaging format (Tube) is unavailable, when alternative product statuses are preferred, or when sourcing from different manufacturers becomes advantageous for supply chain continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM385BXM-2.5/NOPB
Manufacturer	Texas Instruments
Reference Type	Shunt
Output Voltage (Fixed)	2.5V
Output Current	20 mA
Tolerance	±1.5%
Temperature Coefficient	30ppm/°C
Noise (10Hz to 10kHz)	120µVrms
Cathode Current	20 µA
Operating Temperature Range	0°C ~ 70°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Packaging Format	Tube
Product Status	Active
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict adherence to the following critical parameters:

Core Electrical Compatibility Requirements:

Output voltage: 2.5V (fixed)
Output current: 20 mA
Reference type: Shunt
Package / Case: 8-SOIC (0.154", 3.90mm Width)
Mounting type: Surface Mount

Tolerance Grouping: Substitute parts are grouped into two tolerance classes: ±1.5% (direct electrical equivalents) and ±3% (wider tolerance alternatives). Parts with ±1.5% tolerance maintain identical electrical specifications to the main part. Parts with ±3% tolerance represent functional alternatives with relaxed precision requirements.

Temperature Coefficient Variation: Texas Instruments parts specify 20ppm/°C typical, while onsemi parts specify 80ppm/°C typical. Both operate within the same temperature range (0°C ~ 70°C) for this product line.

Packaging Format Variations: Substitute parts are available in Tube, Tape & Reel (TR), and Cut Tape (CT) formats. These represent different supply chain configurations with no impact on electrical performance.

Product Status Consideration: Active parts ensure ongoing availability. Last Time Buy and Obsolete designations indicate limited or discontinued production but do not affect electrical compatibility.

Parameter Comparison

Part Number	Manufacturer	Tolerance	Temp Coeff (ppm/°C)	Cathode Current (µA)	Operating Temp (°C)	Packaging	Product Status
LM385BXM-2.5/NOPB	Texas Instruments	±1.5%	30	20	0 ~ 70	Tube	Active
LM385BDR-2-5	Texas Instruments	±1.5%	20	20	0 ~ 70	Tape & Reel	Last Time Buy
LM385DR-2-5	Texas Instruments	±3%	20	20	0 ~ 70	Tape & Reel	Last Time Buy
LM385DRG4-2-5	Texas Instruments	±3%	20	20	0 ~ 70	Cut Tape	Obsolete
LM385BD-2-5	Texas Instruments	±1.5%	20	20	0 ~ 70	Tube	Last Time Buy
LM285D-2.5G	onsemi	±1.5%	80	30	-40 ~ 85	Tube	Active
LM285D-2.5R2G	onsemi	±1.5%	80	30	-40 ~ 85	Cut Tape & Digi-Reel	Active
LM385BD-2.5G	onsemi	±1.5%	80	30	0 ~ 70	Tube	Active
LM385BD-2.5R2G	onsemi	±1.5%	80	30	0 ~ 70	Tape & Reel	Active
LM385BDE4-2-5	Texas Instruments	±1.5%	20	20	0 ~ 70	Tube	Obsolete
LM385D-2-5	Texas Instruments	±3%	20	20	0 ~ 70	Tube	Last Time Buy

Engineering Selection Recommendations

For Direct Electrical Equivalence (±1.5% Tolerance): Select LM385BDR-2-5, LM385BD-2-5, LM385BD-2.5G, or LM385BD-2.5R2G. These parts maintain the ±1.5% tolerance specification of the original part. LM385BDR-2-5 and LM385BD-2.5R2G are available in Tape & Reel format for automated assembly. LM385BD-2-5 and LM385BD-2.5G are available in Tube format. All are ROHS3 compliant with MSL rating 1.

For Extended Temperature Range: LM285D-2.5G and LM285D-2.5R2G (onsemi) operate across -40°C to 85°C, compared to the standard 0°C to 70°C range. These parts maintain ±1.5% tolerance and are currently active in production. Note that cathode current is specified at 30 µA versus 20 µA for the main part, and temperature coefficient is 80ppm/°C versus 30ppm/°C.

For Relaxed Tolerance Applications (±3%): LM385DR-2-5 and LM385DRG4-2-5 are available when ±3% tolerance is acceptable. Both are designated Last Time Buy or Obsolete, indicating limited availability.

For Packaging Format Flexibility: Texas Instruments parts (LM385 series) are available in Tube and Tape & Reel formats. onsemi parts (LM285/LM385 series) are available in Tube, Tape & Reel, and Cut Tape formats. Selection depends on assembly process requirements.

Frequently Asked Questions (FAQ)

Q: Can LM385DR-2-5 replace LM385BXM-2.5/NOPB directly? A: LM385DR-2-5 is electrically compatible in terms of output voltage (2.5V), output current (20 mA), and package (8-SOIC). However, it specifies ±3% tolerance versus ±1.5% for the original part. Use only if your circuit design tolerates ±3% output voltage variation. Both parts are ROHS3 compliant.

Q: What is the difference between LM385BD-2.5G (onsemi) and LM385BD-2-5 (Texas Instruments)? A: Both deliver 2.5V fixed output with ±1.5% tolerance in 8-SOIC packages. The onsemi version specifies 80ppm/°C temperature coefficient and 30 µA cathode current, while the Texas Instruments version specifies 20ppm/°C and 20 µA. The onsemi part is currently active; the Texas Instruments part is Last Time Buy. Both are ROHS3 compliant.

Q: Are onsemi LM285 parts compatible with Texas Instruments LM385 parts? A: Yes. LM285D-2.5G and LM285D-2.5R2G (onsemi) are electrically compatible substitutes. They deliver the same 2.5V output with ±1.5% tolerance and 20 mA output current in 8-SOIC packages. The LM285 series operates across -40°C to 85°C (extended range) versus 0°C to 70°C for LM385 parts. Both are ROHS3 compliant with MSL rating 1.

Q: What packaging formats are available for automated assembly? A: Tape & Reel (TR) format is standard for automated pick-and-place assembly. Available options include LM385BDR-2-5, LM385BD-2.5R2G, and LM285D-2.5R2G. Cut Tape (CT) format is available for LM385DRG4-2-5 and LM285D-2.5R2G.

Q: Does product status (Active, Last Time Buy, Obsolete) affect electrical performance? A: No. Product status indicates manufacturing availability and supply continuity, not electrical performance. Active parts ensure ongoing production. Last Time Buy and Obsolete designations indicate limited or discontinued production but do not change electrical specifications or compliance certifications.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts are ROHS3 compliant with MSL rating 1 (Unlimited), matching the compliance profile of LM385BXM-2.5/NOPB.

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