LM431CIM Equivalent & Substitute Parts

Part Overview

The LM431CIM is a shunt voltage reference IC manufactured by Texas Instruments, designed for precision voltage regulation applications. This adjustable reference provides a fixed output of 2.5V with a maximum output capability of 37V and supports output currents up to 100mA. The device is currently classified as Last Time Buy, indicating discontinued production status. Identifying equivalent substitute parts ensures design continuity and supply chain reliability for applications requiring this shunt reference functionality.

Substiute Parts

LM431CIM

Texas InstrumentsIn Stock: 1777LM431CIM Datasheet

Current PartRFQ

LM431CIM/NOPB

Texas InstrumentsIn Stock: 2006LM431CIM/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM431CIM is determined by strict equivalence across the following critical parameters:

• Reference Type: Shunt voltage reference architecture
• Output Type: Adjustable output configuration
• Voltage Range: Minimum output 2.5V, maximum output 37V
• Current Capability: 100mA output current rating
• Tolerance Specification: -0.6%, +0.4% accuracy band
• Temperature Coefficient: 50ppm/°C typical performance
• Cathode Current: 1mA minimum operating current
• Operating Temperature Range: -40°C to 85°C
• Package Configuration: 8-SOIC surface mount form factor
• Compliance Standards: ROHS3 compliance and MSL Level 1

Only parts matching all these parameters across electrical performance and mechanical packaging are classified as direct substitutes.

Parameter Comparison

Engineering Selection Recommendations

The LM431CIM/NOPB serves as the direct substitute for the LM431CIM. Both parts are manufactured by Texas Instruments and share identical electrical specifications and mechanical packaging. The primary distinction is product status: the LM431CIM is designated Last Time Buy, while the LM431CIM/NOPB maintains Active status. For new designs or ongoing production requiring shunt voltage reference functionality with 2.5V to 37V output range and 100mA capability, the LM431CIM/NOPB is the appropriate selection. Both parts maintain ROHS3 compliance and MSL Level 1 rating, ensuring compatibility with standard manufacturing and storage protocols.

Frequently Asked Questions (FAQ)

Q: What is the difference between LM431CIM and LM431CIM/NOPB?

A: Both parts are electrically and mechanically identical. The primary difference is product lifecycle status. The LM431CIM is Last Time Buy, indicating end-of-life production. The LM431CIM/NOPB is Active and remains in standard production. The "/NOPB" suffix indicates lead-free plating without lead (Pb).

Q: Can LM431CIM/NOPB be used as a direct replacement in existing designs?

A: Yes. The LM431CIM/NOPB is a direct substitute with identical electrical performance, tolerance specifications, temperature coefficient, and 8-SOIC package configuration. No circuit modifications are required.

Q: Are there any compliance or storage differences between these parts?

A: No. Both parts are ROHS3 compliant and carry MSL Level 1 rating, indicating unlimited shelf life under standard storage conditions. Handling and storage protocols are identical.

Q: What applications require the 2.5V to 37V output range of this shunt reference?

A: The adjustable output range supports precision voltage regulation, power supply feedback networks, and precision current source applications across multiple voltage domains.

Q: Is the 8-SOIC package suitable for high-density PCB layouts?

A: Yes. The 8-SOIC package (0.154" width, 3.90mm) is a standard surface mount form factor suitable for automated assembly and moderate-density board designs.