LM385DR-2-5 Equivalent & Substitute Parts

Part Overview

The LM385DR-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 device operates as a micropower voltage reference with ±3% tolerance and is packaged in 8-SOIC surface mount configuration. The part is currently in Last Time Buy status, indicating end-of-life production. Equivalent and substitute parts are necessary to ensure design continuity and long-term supply chain reliability for applications requiring shunt voltage reference functionality.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM385DR-2-5
Manufacturer	Texas Instruments
Reference Type	Shunt
Output Voltage	2.5V Fixed
Output Current	20 mA
Tolerance	±3%
Noise (10Hz to 10kHz)	120µVrms
Cathode Current	20 µA
Operating Temperature Range	0°C to 70°C
Package Type	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the LM385DR-2-5 are qualified based on the following electrical and mechanical parameters:

Critical Matching Parameters:

Reference Type: Shunt voltage reference
Output Voltage: 2.5V Fixed
Output Current: 20 mA
Package Type: 8-SOIC surface mount
Cathode Current: 20 µA
Noise Specification: 120µVrms (10Hz to 10kHz)

Allowable Variation Parameters:

Tolerance: ±3% (main part) to ±1.5% (substitute parts with improved tolerance)
Temperature Coefficient: 20ppm/°C to 150ppm/°C
Operating Temperature Range: 0°C to 70°C (main part) or -40°C to 85°C (extended range substitutes)
Packaging Format: Tape & Reel, Tube, Bulk, or Cut Tape

Substitute parts maintain identical electrical performance in the 2.5V shunt reference category while offering improved tolerance specifications and extended temperature operating ranges in certain variants.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Tolerance	Temp Coefficient	Operating Temp	Package	Product Status
LM385DR-2-5	Texas Instruments	2.5V	±3%	20ppm/°C	0°C to 70°C	8-SOIC TR	Last Time Buy
LM285M-2.5/NOPB	Texas Instruments	2.5V	±1.5%	150ppm/°C	-40°C to 85°C	8-SOIC Tube	Active
LM285MX-2.5/NOPB	Texas Instruments	2.5V	±1.5%	150ppm/°C	-40°C to 85°C	8-SOIC CT	Active
LM385BM-2.5/NOPB	National Semiconductor	2.5V	±1.5%	150ppm/°C	0°C to 70°C	8-SOIC Bulk	Active
LM385BMX-2.5/NOPB	Texas Instruments	2.5V	±1.5%	150ppm/°C	0°C to 70°C	8-SOIC TR	Active
LM385BXM-2.5/NOPB	Texas Instruments	2.5V	±1.5%	30ppm/°C	0°C to 70°C	8-SOIC Tube	Active
LM385BXMX-2.5/NOPB	Texas Instruments	2.5V	±1.5%	30ppm/°C	0°C to 70°C	8-SOIC TR	Active
LM385BYM-2.5/NOPB	Texas Instruments	2.5V	±1.5%	50ppm/°C	0°C to 70°C	8-SOIC Tube	Active
LM385BYMX-2.5/NOPB	Texas Instruments	2.5V	±1.5%	50ppm/°C	0°C to 70°C	8-SOIC TR	Active
LM385M-2.5/NOPB	Texas Instruments	2.5V	±3%	150ppm/°C	0°C to 70°C	8-SOIC Tube	Active
LM385MX-2.5/NOPB	National Semiconductor	2.5V	±3%	150ppm/°C	0°C to 70°C	8-SOIC Bulk	Active

Engineering Selection Recommendations

Direct Replacement (Same Tolerance ±3%): LM385M-2.5/NOPB and LM385MX-2.5/NOPB maintain the same ±3% tolerance specification as the LM385DR-2-5. Both parts are in Active product status and ROHS3 compliant. Selection between these options depends on packaging requirements: LM385M-2.5/NOPB is supplied in Tube format, while LM385MX-2.5/NOPB is supplied in Bulk format.

Improved Tolerance Substitutes (±1.5%): Parts with ±1.5% tolerance (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) provide tighter output voltage accuracy. These parts are all in Active product status and ROHS3 compliant. Temperature coefficient variations (30ppm/°C, 50ppm/°C, 150ppm/°C) allow selection based on thermal stability requirements.

Extended Temperature Range: LM285M-2.5/NOPB and LM285MX-2.5/NOPB extend the operating temperature range to -40°C to 85°C, suitable for applications requiring wider environmental operating conditions.

Packaging Considerations: Tape & Reel (TR) packaging is recommended for high-volume automated assembly. Tube packaging is suitable for lower-volume or manual assembly operations. Bulk packaging is available for specific procurement scenarios.

All substitute parts maintain electrical compatibility with the LM385DR-2-5 in terms of output voltage, output current, cathode current, and noise specifications.

Frequently Asked Questions (FAQ)

Q: Can LM385M-2.5/NOPB directly replace LM385DR-2-5 in existing designs? A: Yes. LM385M-2.5/NOPB maintains identical electrical specifications including ±3% tolerance, 2.5V output, 20 mA output current, and 8-SOIC package. The primary difference is packaging format (Tube vs. Tape & Reel). Pin configuration and electrical performance are equivalent.

Q: What is the advantage of selecting a ±1.5% tolerance substitute? A: Parts with ±1.5% tolerance provide tighter output voltage accuracy compared to the ±3% specification of the LM385DR-2-5. This improved tolerance reduces voltage variation across production batches and temperature ranges, beneficial for precision analog circuits requiring stable reference voltages.

Q: Are the LM285 series parts compatible with LM385 designs? A: Yes. LM285M-2.5/NOPB and LM285MX-2.5/NOPB are functionally equivalent shunt voltage references with identical 2.5V output, 20 mA current, and 8-SOIC packaging. The LM285 series offers extended operating temperature range (-40°C to 85°C) compared to the standard 0°C to 70°C range.

Q: What packaging formats are available for substitute parts? A: Substitute parts are available in Tape & Reel (TR), Tube, Bulk, and Cut Tape (CT) formats. Tape & Reel is standard for automated assembly. Tube format is suitable for manual assembly or lower-volume applications. Bulk and Cut Tape formats serve specific procurement and assembly requirements.

Q: How do temperature coefficient differences affect part selection? A: Temperature coefficient (ppm/°C) indicates voltage drift with temperature changes. Lower values (30ppm/°C) provide better thermal stability. The LM385DR-2-5 specifies 20ppm/°C typical. Substitute parts range from 30ppm/°C to 150ppm/°C. Selection depends on application sensitivity to temperature-induced voltage variations.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed substitute parts are ROHS3 compliant with Moisture Sensitivity Level 1 (Unlimited), matching the environmental and regulatory compliance of the LM385DR-2-5.

Q: What is the inventory status of substitute parts? A: All substitute parts are in Active product status with current inventory availability ranging from 673 to 59,670 units, ensuring reliable supply chain access compared to the Last Time Buy status of the LM385DR-2-5.

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