LM385MX Equivalent & Substitute Parts

Part Overview

The LM385MX is a shunt voltage reference IC manufactured by Texas Instruments, classified as a Power Management (PMIC) component. This adjustable reference device generates a stable 1.24V output with ±2% tolerance and supports output currents up to 20 mA. The LM385MX is designated as Last Time Buy, indicating end-of-life status. Alternative equivalent parts are available to support ongoing design requirements and procurement needs.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Reference Type	Shunt
Output Type	Adjustable
Voltage - Output (Min/Fixed)	1.24V
Voltage - Output (Max)	5.3 V
Current - Output	20 mA
Tolerance	±2%
Temperature Coefficient	30ppm/°C
Noise - 10Hz to 10kHz	50µVrms
Current - Cathode	55 µA
Operating Temperature	0°C ~ 70°C (TA)
Package / Case	8-SOIC (0.154", 3.90mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the LM385MX is determined by the following critical parameters: reference type (shunt), package type (8-SOIC), output current capability (20 mA), operating temperature range (0°C ~ 70°C), and compliance certifications (ROHS3, REACH Unaffected).

Two substitute parts are identified:

LM385MX/NOPB — Parametric equivalent with identical electrical specifications (adjustable output, ±2% tolerance, 30ppm/°C temperature coefficient, 50µVrms noise). Packaging differs (Tape & Reel vs. standard). Product status is Active.

LM385MX-1.2/NOPB — Direct manufacturer variant with fixed 1.235V output instead of adjustable. Output type and tolerance differ (fixed output, -2.43%/+2.02% asymmetric tolerance, 150ppm/°C temperature coefficient). Cathode current is lower (15 µA vs. 55 µA). Product status is Active with higher inventory availability.

Parameter Comparison

Parameter	LM385MX	LM385MX/NOPB	LM385MX-1.2/NOPB
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments
Product Status	Last Time Buy	Active	Active
Reference Type	Shunt	Shunt	Shunt
Output Type	Adjustable	Adjustable	Fixed
Voltage - Output (Min/Fixed)	1.24V	1.24V	1.235V
Voltage - Output (Max)	5.3 V	5.3 V	N/A
Current - Output	20 mA	20 mA	20 mA
Tolerance	±2%	±2%	-2.43%, +2.02%
Temperature Coefficient	30ppm/°C	30ppm/°C	150ppm/°C
Noise - 10Hz to 10kHz	50µVrms	50µVrms	60µVrms
Current - Cathode	55 µA	55 µA	15 µA
Operating Temperature	0°C ~ 70°C (TA)	0°C ~ 70°C (TA)	0°C ~ 70°C (TA)
Package / Case	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)
Packaging Type	Standard	Tape & Reel (TR)	Tape & Reel (TR)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

LM385MX/NOPB is the primary substitute for LM385MX applications. It provides identical electrical performance (adjustable output, ±2% tolerance, 30ppm/°C temperature coefficient) and maintains the same 8-SOIC package footprint. The only difference is packaging format (Tape & Reel). Product status is Active with 2189 units in stock, ensuring supply continuity. All compliance certifications (ROHS3, REACH Unaffected) are maintained.

LM385MX-1.2/NOPB is suitable only for applications requiring a fixed 1.235V reference output. This variant introduces differences in output type (fixed vs. adjustable), tolerance specification (-2.43%/+2.02% asymmetric), temperature coefficient (150ppm/°C vs. 30ppm/°C), and cathode current (15 µA vs. 55 µA). Selection of this part requires confirmation that the fixed output voltage and modified electrical characteristics are compatible with circuit requirements. Product status is Active with 27700 units in stock.

Frequently Asked Questions (FAQ)

Q: Can LM385MX/NOPB directly replace LM385MX in existing designs?

A: Yes. LM385MX/NOPB is a parametric equivalent with identical electrical specifications and the same 8-SOIC package footprint. The difference is packaging format (Tape & Reel vs. standard). No circuit modifications are required.

Q: What are the key differences between LM385MX and LM385MX-1.2/NOPB?

A: LM385MX-1.2/NOPB has a fixed 1.235V output instead of adjustable 1.24V to 5.3V range. It also has higher temperature coefficient (150ppm/°C vs. 30ppm/°C), asymmetric tolerance (-2.43%/+2.02% vs. ±2%), lower cathode current (15 µA vs. 55 µA), and higher noise (60µVrms vs. 50µVrms). These differences may affect circuit performance and require design validation.

Q: Why is LM385MX designated as Last Time Buy?

A: Last Time Buy status indicates the manufacturer is discontinuing this product. LM385MX/NOPB (Active status) is the recommended alternative for new designs and ongoing procurement.

Q: Are all three parts in the same package?

A: Yes. All three parts use the 8-SOIC (0.154", 3.90mm Width) package, ensuring identical PCB footprint compatibility.

Q: Do all parts meet the same compliance requirements?

A: Yes. All three parts are ROHS3 Compliant, REACH Unaffected, and have Moisture Sensitivity Level 1 (Unlimited).

Q: Which substitute should I choose for a new design?

A: LM385MX/NOPB is the recommended choice for new designs. It provides identical electrical performance to LM385MX with Active product status and assured supply availability.

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