LM385M Equivalent & Substitute Parts

Part Overview

The LM385M is a shunt voltage reference IC manufactured by Texas Instruments, designed for precision voltage reference applications requiring adjustable output. This component operates as a micropower reference with an adjustable output range from 1.24V to 5.3V and is packaged in an 8-SOIC surface mount configuration. The LM385M is currently in Last Time Buy status, making identification of suitable substitute components essential for ongoing design support and procurement planning.

Substiute Parts

LM385M

Texas InstrumentsIn Stock: 2474LM385M Datasheet

Current PartRFQ

LM385M-1.2/NOPB

Texas InstrumentsIn Stock: 26936LM385M-1.2/NOPB Datasheet

DirectRFQ

LM385M/NOPB

National SemiconductorIn Stock: 3999LM385M/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM385M is determined by the following critical parameters: reference type (shunt), package configuration (8-SOIC), output voltage range capability, current output rating, tolerance specification, and temperature coefficient. Substitute parts must maintain compatibility across these dimensions to ensure functional equivalence in circuit applications.

The LM385M has two identified substitute components:

LM385M-1.2/NOPB qualifies as a substitute based on identical package, reference type, current output, temperature coefficient, and operating temperature range. This variant differs in output type (fixed 1.235V versus adjustable) and tolerance specification (-2.43%, +2.02% versus ±2%), making it suitable for applications where a fixed 1.235V reference meets design requirements.

LM385M/NOPB (National Semiconductor variant) qualifies as a substitute based on identical electrical specifications, package configuration, reference type, output voltage range, current output, tolerance, temperature coefficient, and operating temperature. This part represents an alternative sourcing option from National Semiconductor with equivalent performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

LM385M/NOPB (National Semiconductor) is the primary substitute for direct replacement. This part maintains identical electrical specifications, package configuration, and output characteristics as the original LM385M. Both components are manufactured to the same base product number (LM385) and share equivalent performance across all critical parameters. This variant is currently in Active product status, ensuring continued availability and supply chain stability.

LM385M-1.2/NOPB is suitable as a substitute only in applications where a fixed 1.235V output reference is acceptable. This part is appropriate for designs that do not require output voltage adjustment and can tolerate the asymmetric tolerance specification (-2.43%, +2.02%). The LM385M-1.2/NOPB offers lower cathode current (15µA versus 55µA) and slightly elevated noise performance (60µVrms versus 50µVrms). This variant is in Active product status with higher inventory availability.

Both substitute parts maintain ROHS3 compliance and MSL Level 1 rating, ensuring compatibility with standard manufacturing and storage requirements.

Frequently Asked Questions (FAQ)

Q: Can LM385M-1.2/NOPB replace LM385M in all applications?

A: LM385M-1.2/NOPB is suitable only for applications requiring a fixed 1.235V reference output. The original LM385M provides adjustable output from 1.24V to 5.3V. If your circuit design requires output voltage adjustment capability, LM385M-1.2/NOPB is not compatible. If your design uses a fixed 1.235V reference, this substitute is functionally equivalent.

Q: What is the difference between the Texas Instruments and National Semiconductor versions?

A: Both LM385M (TI) and LM385M/NOPB (National Semiconductor) share identical electrical specifications, package configuration, and performance characteristics. The primary difference is manufacturer sourcing. National Semiconductor's variant is currently in Active status, providing an alternative supply source for the same functional component.

Q: Are there package compatibility concerns when substituting these parts?

A: All three parts use identical 8-SOIC (0.154", 3.90mm Width) surface mount packaging. PCB footprints, solder reflow profiles, and assembly processes are directly compatible with no modifications required.

Q: How do tolerance specifications affect substitution?

A: The LM385M and LM385M/NOPB both specify ±2% tolerance. The LM385M-1.2/NOPB uses asymmetric tolerance (-2.43%, +2.02%), which may affect circuit performance in applications with tight voltage reference requirements. Verify that the asymmetric tolerance meets your design specifications before substitution.

Q: What is the significance of cathode current differences?

A: The LM385M and LM385M/NOPB both draw 55µA cathode current, while LM385M-1.2/NOPB draws 15µA. Lower cathode current reduces power consumption but may affect circuit biasing in designs that depend on specific cathode current characteristics. Verify compatibility with your circuit design.

Q: Are all substitute parts RoHS compliant?

A: LM385M and LM385M-1.2/NOPB are both ROHS3 compliant. RoHS status for LM385M/NOPB (National Semiconductor) is not specified in available documentation. Confirm RoHS compliance requirements with your procurement or quality assurance department before final selection.