LM385D-2-5 Equivalent & Substitute Parts

Part Overview

The LM385D-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 surface mount 8-SOIC device delivers 20 mA output current with ±3% tolerance and operates across the 0°C to 70°C temperature range. The part is classified as Last Time Buy, indicating production discontinuation. Equivalent and substitute parts are necessary to maintain design continuity and ensure long-term component availability for new production runs and field replacements.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Type	Fixed
Voltage - Output (Min/Fixed)	2.5V
Current - Output	20 mA
Tolerance	±3%
Noise - 10Hz to 10kHz	120µVrms
Current - Cathode	20 µA
Operating Temperature	0°C ~ 70°C (TA)
Mounting Type	Surface Mount
Package / Case	8-SOIC (0.154", 3.90mm Width)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the LM385D-2-5 is determined by the following critical parameters:

Mandatory Matching Parameters:

Reference Type: Shunt
Output Type: Fixed
Voltage - Output: 2.5V
Current - Output: 20 mA
Noise - 10Hz to 10kHz: 120µVrms
Current - Cathode: 20 µA
Package / Case: 8-SOIC (0.154", 3.90mm Width)
RoHS Status: ROHS3 Compliant

Allowable Variation Parameters:

Tolerance: ±3% (main part) to ±1.5% (substitute) — tighter tolerance is acceptable
Temperature Coefficient: 20ppm/°C to 150ppm/°C — variation permitted based on application requirements
Operating Temperature: 0°C ~ 70°C (main part) to -40°C ~ 85°C (substitute) — extended range is acceptable
Packaging Format: Tube, Cut Tape (CT), Tape & Reel (TR), Bulk — all formats are functionally equivalent
Mounting Type: Surface Mount (all candidates maintain this requirement)

Substitutes are grouped into two categories: direct functional equivalents with identical tolerance (±3%) and enhanced performance variants with improved tolerance (±1.5%) and extended temperature ranges.

Parameter Comparison

Part Number	Manufacturer	Tolerance	Temp Coeff	Operating Temp	Package	Packaging Format	Product Status
LM385D-2-5	Texas Instruments	±3%	20ppm/°C	0°C ~ 70°C	8-SOIC	Tube	Last Time Buy
LM385LPR-2-5	Texas Instruments	±3%	20ppm/°C	0°C ~ 70°C	TO-92-3	Cut Tape (CT)	Active
LM285M-2.5/NOPB	Texas Instruments	±1.5%	150ppm/°C	-40°C ~ 85°C	8-SOIC	Tube	Active
LM285MX-2.5/NOPB	Texas Instruments	±1.5%	150ppm/°C	-40°C ~ 85°C	8-SOIC	Cut Tape (CT) & Digi-Reel®	Active
LM385BM-2.5/NOPB	National Semiconductor	±1.5%	150ppm/°C	0°C ~ 70°C	8-SOIC	Bulk	Active
LM385BMX-2.5/NOPB	Texas Instruments	±1.5%	150ppm/°C	0°C ~ 70°C	8-SOIC	Tape & Reel (TR)	Active
LM385BXM-2.5/NOPB	Texas Instruments	±1.5%	30ppm/°C	0°C ~ 70°C	8-SOIC	Tube	Active
LM385BXMX-2.5/NOPB	Texas Instruments	±1.5%	30ppm/°C	0°C ~ 70°C	8-SOIC	Tape & Reel (TR)	Active
LM385BYM-2.5/NOPB	Texas Instruments	±1.5%	50ppm/°C	0°C ~ 70°C	8-SOIC	Tube	Active
LM385BYMX-2.5/NOPB	Texas Instruments	±1.5%	50ppm/°C	0°C ~ 70°C	8-SOIC	Tape & Reel (TR)	Active
LM385M-2.5/NOPB	Texas Instruments	±3%	150ppm/°C	0°C ~ 70°C	8-SOIC	Tube	Active

Engineering Selection Recommendations

For Direct Functional Replacement (±3% Tolerance, Same Temperature Range):

LM385M-2.5/NOPB is the primary substitute for LM385D-2-5 when maintaining identical electrical specifications is required. Both parts share ±3% tolerance, 0°C to 70°C operating range, and 8-SOIC surface mount packaging. LM385M-2.5/NOPB is in Active product status with 26,655 units in stock, ensuring long-term availability. This part is ROHS3 compliant and carries identical regulatory certifications (EAR99, HTSUS 8542.39.0001).

For Enhanced Performance Substitution (±1.5% Tolerance):

LM385BXM-2.5/NOPB and LM385BXMX-2.5/NOPB offer improved tolerance (±1.5%) with lower temperature coefficient (30ppm/°C) while maintaining the same operating temperature range (0°C ~ 70°C) and 8-SOIC package. These parts are suitable when tighter voltage accuracy is beneficial to system performance. Both are Active status with ROHS3 compliance.

LM285M-2.5/NOPB and LM285MX-2.5/NOPB provide ±1.5% tolerance with extended operating temperature range (-40°C ~ 85°C), appropriate for applications requiring wider temperature operation. Both are Active status with ROHS3 compliance.

For Through-Hole Applications:

LM385LPR-2-5 is the only through-hole substitute, packaged in TO-92-3 format. This part maintains ±3% tolerance and 0°C to 70°C operating range but requires different PCB layout and assembly processes compared to the surface mount LM385D-2-5.

Frequently Asked Questions (FAQ)

Q: Can LM385LPR-2-5 replace LM385D-2-5 directly on the PCB?

A: No. LM385LPR-2-5 uses TO-92-3 through-hole packaging while LM385D-2-5 is 8-SOIC surface mount. PCB layout, footprint, and assembly process must be redesigned. Electrical specifications (2.5V, 20 mA, ±3% tolerance) are identical, but physical mounting is incompatible.

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

A: Both are 2.5V shunt voltage reference ICs with identical output voltage, current, and noise specifications. LM285 variants offer ±1.5% tolerance compared to LM385's ±3%, and some LM285 parts extend operating temperature to -40°C ~ 85°C. Temperature coefficient values differ between variants. Selection depends on tolerance and temperature range requirements.

Q: Are all 8-SOIC packaged substitutes pin-compatible with LM385D-2-5?

A: Yes. All 8-SOIC surface mount substitutes listed (LM285M-2.5/NOPB, LM285MX-2.5/NOPB, LM385BM-2.5/NOPB, LM385BMX-2.5/NOPB, LM385BXM-2.5/NOPB, LM385BXMX-2.5/NOPB, LM385BYM-2.5/NOPB, LM385BYMX-2.5/NOPB, and LM385M-2.5/NOPB) share identical 8-SOIC pinout and can be substituted without PCB modification.

Q: Does tighter tolerance (±1.5%) affect circuit compatibility?

A: No. Tighter tolerance is a performance enhancement. A ±1.5% part will operate correctly in any circuit designed for ±3% tolerance. The circuit will experience improved voltage accuracy without functional issues.

Q: What packaging formats are available for 8-SOIC substitutes?

A: 8-SOIC substitutes are available in Tube, Cut Tape (CT), Tape & Reel (TR), and Bulk formats. All formats contain electrically identical parts; packaging format selection depends on procurement volume and assembly line requirements.

Q: Why is LM385D-2-5 marked as Last Time Buy?

A: Last Time Buy status indicates Texas Instruments has discontinued production of this specific part number. Customers must transition to active alternatives such as LM385M-2.5/NOPB or enhanced variants before inventory is exhausted.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All listed substitutes carry ROHS3 Compliant certification, matching the environmental compliance of LM385D-2-5.

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