LM431BCM3 Equivalent & Substitute Parts

Part Overview

The LM431BCM3 is a shunt voltage reference IC with adjustable output, manufactured by Texas Instruments. This component functions as a precision voltage reference in power management applications, offering adjustable output from 2.495V to 37V with ±1% tolerance. The part is classified as Last Time Buy, indicating discontinued production. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications currently using this component.

Substiute Parts

LM431BCM3

Texas InstrumentsIn Stock: 7174LM431BCM3 Datasheet

Current PartRFQ

LM431BCM3/NOPB

Texas InstrumentsIn Stock: 1541LM431BCM3/NOPB Datasheet

Parametric EquivalentRFQ

LM431BCM3X/NOPB

Texas InstrumentsIn Stock: 35130LM431BCM3X/NOPB Datasheet

Parametric EquivalentRFQ

AS431HMANTR-G1

Diodes IncorporatedIn Stock: 5000277AS431HMANTR-G1 Datasheet

MFR RecommendedRFQ

TL431AFDT,215

Nexperia USA Inc.In Stock: 59193TL431AFDT,215 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM431BCM3 is determined by the following critical parameters:

• Reference Type: Shunt (all substitutes must be shunt-type references)
• Output Type: Adjustable (output voltage must be user-adjustable)
• Voltage Range: Minimum output 2.495V, maximum output 36V or higher
• Current - Output: 100 mA capability
• Package: SOT-23-3 / TO-236-3 / SC-59 (identical physical form factor)
• Tolerance: ±1% or better
• Temperature Coefficient: 50ppm/°C or better (lower is acceptable)
• Operating Temperature: Must support 0°C ~ 70°C minimum range
• RoHS Compliance: ROHS3 Compliant

Substitute parts are grouped into two categories: parametric equivalents (identical specifications from the same manufacturer) and manufacturer-recommended alternatives (functionally equivalent from different manufacturers with enhanced or comparable performance characteristics).

Parameter Comparison

Engineering Selection Recommendations

Parametric Equivalents (Texas Instruments):

LM431BCM3/NOPB and LM431BCM3X/NOPB are direct parametric equivalents from Texas Instruments with identical electrical specifications to the LM431BCM3. Both parts are in Active product status, ensuring long-term availability. LM431BCM3X/NOPB offers significantly higher inventory (35,100 pcs) compared to LM431BCM3/NOPB (1,438 pcs), making it the preferred choice for immediate supply requirements. Both maintain ROHS3 compliance and MSL 1 rating.

Manufacturer-Recommended Alternatives:

AS431HMANTR-G1 (Diodes Incorporated) provides enhanced performance with ±0.5% tolerance (versus ±1%) and superior temperature coefficient of 20ppm/°C (versus 50ppm/°C). Operating temperature range extends to -40°C ~ 125°C. This part is suitable for applications requiring tighter tolerance and wider temperature operation. Cathode current is reduced to 500 µA. Maximum output voltage is 36V (1V lower than LM431BCM3).

TL431AFDT,215 (Nexperia USA Inc.) maintains ±1% tolerance and supports -40°C ~ 125°C operating range. This part carries AEC-Q100 automotive qualification, making it suitable for automotive-grade applications. Maximum output voltage is 36V. Cathode current is 600 µA. MSL rating remains 1 (Unlimited).

All substitute parts maintain identical SOT-23-3 package form factor, enabling direct PCB-level replacement without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can LM431BCM3/NOPB be used as a direct replacement for LM431BCM3?

A: Yes. LM431BCM3/NOPB is a parametric equivalent with identical electrical specifications. The primary difference is product status: LM431BCM3 is Last Time Buy while LM431BCM3/NOPB is Active. Both parts are manufactured by Texas Instruments and share the same SOT-23-3 package.

Q: What is the difference between LM431BCM3X/NOPB and LM431BCM3/NOPB?

A: Both are parametric equivalents with identical electrical specifications. The primary distinction is inventory availability: LM431BCM3X/NOPB has 35,100 pcs in stock versus 1,438 pcs for LM431BCM3/NOPB. Electrical performance and package form factor are identical.

Q: Can AS431HMANTR-G1 replace LM431BCM3 in all applications?

A: AS431HMANTR-G1 is functionally compatible for most applications. Key differences include: maximum output voltage of 36V (versus 37V), tighter tolerance of ±0.5% (versus ±1%), superior temperature coefficient of 20ppm/°C (versus 50ppm/°C), and extended operating temperature range of -40°C ~ 125°C (versus 0°C ~ 70°C). Applications requiring output above 36V or operating below 0°C require verification.

Q: Is TL431AFDT,215 suitable for automotive applications?

A: Yes. TL431AFDT,215 carries AEC-Q100 automotive qualification and is suitable for automotive-grade designs. It maintains ±1% tolerance, 100 mA output current, and SOT-23-3 package compatibility. Operating temperature range extends to -40°C ~ 125°C.

Q: Do all substitute parts use the same SOT-23-3 package?

A: Yes. All substitute parts (LM431BCM3/NOPB, LM431BCM3X/NOPB, AS431HMANTR-G1, and TL431AFDT,215) use SOT-23-3 / TO-236-3 / SC-59 package form factor, enabling direct PCB replacement without layout modifications.

Q: What is the significance of the cathode current differences among substitutes?

A: Cathode current affects the minimum load requirement for stable operation. LM431BCM3 requires 1 mA minimum cathode current, while AS431HMANTR-G1 requires 500 µA and TL431AFDT,215 requires 600 µA. Lower cathode current requirements provide greater design flexibility in high-impedance applications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts (LM431BCM3/NOPB, LM431BCM3X/NOPB, AS431HMANTR-G1, and TL431AFDT,215) are ROHS3 compliant and suitable for applications with RoHS requirements.