LM431BCMX Equivalent & Substitute Parts

Part Overview

The LM431BCMX is a shunt voltage reference IC with adjustable output, manufactured by Texas Instruments. This component is classified as a Power Management (PMIC) device and provides a precision voltage reference with ±1% tolerance across its 2.495V to 37V output range. The part is currently listed as obsolete, making identification of suitable substitutes essential for ongoing design support and production continuity. The LM431BCMX operates in the 0°C to 70°C temperature range and is packaged in an 8-SOIC surface mount configuration.

Substiute Parts

LM431BCMX

Texas InstrumentsIn Stock: 26122LM431BCMX Datasheet

Current PartRFQ

LM431BCMX/NOPB

National SemiconductorIn Stock: 17428LM431BCMX/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM431BCMX is determined by strict equivalence across the following critical parameters:

• Reference Type: Shunt
• Output Type: Adjustable
• Voltage Range: 2.495V minimum to 37V maximum
• Current Output: 100 mA
• Tolerance: ±1%
• Temperature Coefficient: 50ppm/°C Typical
• Package: 8-SOIC surface mount
• Operating Temperature Range: 0°C ~ 70°C

The LM431BCMX/NOPB qualifies as a parametric equivalent substitute based on identical electrical specifications and package configuration. Both parts share the same base product number (LM431) and maintain full compatibility across all specified parameters.

Parameter Comparison

Engineering Selection Recommendations

The LM431BCMX is classified as obsolete, necessitating transition to an active equivalent for new designs and ongoing production support. The LM431BCMX/NOPB is an active product with identical electrical and mechanical specifications, making it the direct substitute for the obsolete LM431BCMX.

Both parts carry the same ECCN (EAR99) and HTSUS (8542.39.0001) classifications, ensuring regulatory consistency. The LM431BCMX/NOPB maintains full pin-for-pin and functional compatibility with the original part, requiring no circuit modifications or design changes.

Frequently Asked Questions (FAQ)

Q: Can the LM431BCMX/NOPB be used as a direct replacement for the LM431BCMX?

A: Yes. Both parts are electrically and mechanically identical across all specified parameters, including voltage range, current output, tolerance, temperature coefficient, and 8-SOIC package configuration. No circuit modifications are required.

Q: What is the primary reason for substitution?

A: The LM431BCMX is obsolete. The LM431BCMX/NOPB is an active product with identical specifications, ensuring continued availability and production support.

Q: Are there any package or pinout differences?

A: No. Both parts use the 8-SOIC (0.154", 3.90mm Width) surface mount package with identical pinout and mechanical dimensions.

Q: Do the parts have different compliance or regulatory status?

A: Both parts share the same ECCN (EAR99) and HTSUS (8542.39.0001) classifications. Regulatory compliance is equivalent.

Q: What are the critical parameters for substitution compatibility?

A: Shunt reference type, adjustable output, 2.495V to 37V voltage range, 100 mA output current, ±1% tolerance, 50ppm/°C temperature coefficient, and 8-SOIC package are the defining parameters for substitution equivalence.