LM431CCM/NOPB Equivalent & Substitute Parts

Part Overview

The LM431CCM/NOPB 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 100 mA. The device operates across the industrial temperature range of 0°C to 70°C and is packaged in an 8-SOIC surface mount configuration.

The LM431CCM/NOPB maintains active product status and is ROHS3 compliant, making it suitable for modern electronic designs. Substitute parts become necessary when addressing supply chain constraints, inventory availability, or specific application requirements that align with the device's core electrical and mechanical specifications.

Substiute Parts

LM431CCM/NOPB

Texas InstrumentsIn Stock: 756LM431CCM/NOPB Datasheet

Current PartRFQ

TL431BCD

onsemiIn Stock: 1918TL431BCD Datasheet

DirectRFQ

TL431BCDR

Texas InstrumentsIn Stock: 2485TL431BCDR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM431CCM/NOPB is determined by strict alignment of the following electrical and mechanical parameters:

Critical Substitution Parameters:

• Reference Type: Shunt (must match)
• Output Type: Adjustable (must match)
• Voltage - Output (Min/Fixed): 2.5V nominal range
• Voltage - Output (Max): 36V to 37V range
• Current - Output: 100 mA (must match)
• Package / Case: 8-SOIC form factor (must match)
• Mounting Type: Surface Mount (must match)
• Operating Temperature: 0°C ~ 70°C (must match)

The substitute parts identified—TL431BCD and TL431BCDR—maintain compatibility across these core parameters. Variations in tolerance specifications and cathode current do not prevent functional substitution when the application design accommodates these differences.

Parameter Comparison

Engineering Selection Recommendations

TL431BCDR (Texas Instruments) is the preferred substitute for the LM431CCM/NOPB. Both devices are manufactured by Texas Instruments, maintain active product status, and are ROHS3 compliant. The TL431BCDR is supplied in Tape & Reel packaging with 2400 units in stock, providing reliable supply chain continuity. The tolerance specification of ±0.5% and cathode current of 600 µA represent minor deviations that do not compromise functional compatibility in standard voltage reference applications.

TL431BCD (onsemi) serves as an alternative substitute when supply constraints require sourcing from secondary manufacturers. This device maintains electrical compatibility with identical output current and cathode current specifications. However, the TL431BCD carries obsolete product status and is not ROHS3 compliant, limiting its suitability for new designs or applications with environmental compliance requirements.

Frequently Asked Questions (FAQ)

Q: Can TL431BCD be used as a direct replacement for LM431CCM/NOPB?

A: TL431BCD maintains electrical compatibility across core parameters including reference type, output type, current ratings, and package configuration. However, the obsolete product status and non-compliance with ROHS3 standards make it unsuitable for new designs or applications requiring environmental certifications.

Q: What is the significance of the tolerance difference between LM431CCM/NOPB (-0.6%, +0.4%) and TL431BCDR (±0.5%)?

A: The LM431CCM/NOPB provides asymmetrical tolerance with tighter negative tolerance, while TL431BCDR specifies symmetrical tolerance. Both fall within acceptable ranges for precision voltage reference applications. Circuit design must account for the maximum tolerance variation of each device.

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

A: All three devices use identical 8-SOIC surface mount packaging (0.154", 3.90mm width). PCB footprints and reflow profiles remain unchanged during substitution.

Q: What is the impact of cathode current differences between LM431CCM/NOPB (1 mA) and TL431BCDR (600 µA)?

A: The lower cathode current in TL431BCDR reduces power dissipation in the reference circuit. Applications designed for the LM431CCM/NOPB will function with TL431BCDR, though bias network calculations may require adjustment to optimize performance.

Q: Which substitute part is recommended for new product designs?

A: TL431BCDR is the recommended substitute for new designs. It maintains active product status, ROHS3 compliance, and Texas Instruments manufacturing continuity with the original LM431CCM/NOPB.