LM431BCM3X Equivalent & Substitute Parts

Part Overview

The LM431BCM3X is a shunt voltage reference IC with adjustable output, manufactured by Texas Instruments. This component is classified as obsolete, which necessitates identification of active equivalent and substitute parts for ongoing design support and procurement. The LM431BCM3X operates as an adjustable shunt regulator with a 2.495V minimum output and 37V maximum output rating, delivering up to 100mA output current with ±1% tolerance. Surface mount SOT-23-3 packaging enables integration into compact power management circuits.

Substiute Parts

LM431BCM3X

Texas InstrumentsIn Stock: 85313LM431BCM3X Datasheet

Current PartRFQ

LM431BCM3X/NOPB

Texas InstrumentsIn Stock: 35130LM431BCM3X/NOPB Datasheet

DirectRFQ

LM431BCM3

Texas InstrumentsIn Stock: 7174LM431BCM3 Datasheet

Parametric EquivalentRFQ

LM431BCM3/NOPB

Texas InstrumentsIn Stock: 1541LM431BCM3/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 of the LM431BCM3X is determined by the following critical parameters:

• Reference Type: Shunt (all substitutes maintain this topology)
• Output Type: Adjustable (all substitutes provide adjustable output)
• Voltage - Output (Min/Fixed): 2.495V (all substitutes match this minimum)
• Current - Output: 100mA (all substitutes support this rating)
• Package / Case: SOT-23-3 compatible (all substitutes use equivalent surface mount packaging)

Substitutes are grouped into three categories based on product status and compliance:

Direct Manufacturer Equivalents (Texas Instruments): LM431BCM3X/NOPB, LM431BCM3, and LM431BCM3/NOPB maintain identical electrical specifications and packaging, with differences in product status and RoHS compliance.

Manufacturer Recommended Alternatives: AS431HMANTR-G1 (Diodes Incorporated) and TL431AFDT,215 (Nexperia USA Inc.) provide parametric equivalence with enhanced specifications and extended operating temperature ranges.

Parameter Comparison

Engineering Selection Recommendations

For RoHS3 Compliance Requirements: LM431BCM3X/NOPB or LM431BCM3/NOPB are direct Texas Instruments equivalents with active product status and full RoHS3 compliance. These parts maintain identical electrical specifications and operating temperature range to the original LM431BCM3X.

For Extended Temperature Range Applications: AS431HMANTR-G1 and TL431AFDT,215 extend operating temperature to -40°C ~ 125°C, supporting industrial and automotive environments. AS431HMANTR-G1 provides improved tolerance (±0.5%) and lower temperature coefficient (20ppm/°C). TL431AFDT,215 carries AEC-Q100 automotive qualification.

For Immediate Procurement: LM431BCM3X/NOPB offers the highest inventory availability (35,100 units) with active product status and RoHS3 compliance, making it the primary recommendation for new designs and production continuity.

For Cost-Optimized Designs: LM431BCM3 remains available (7,120 units) under Last Time Buy status with identical specifications to LM431BCM3X/NOPB, suitable for designs with extended procurement lead times.

Frequently Asked Questions (FAQ)

Q: Can LM431BCM3X/NOPB directly replace LM431BCM3X in existing designs?

A: Yes. LM431BCM3X/NOPB is a direct equivalent with identical electrical specifications, output voltage range (2.495V to 37V), current rating (100mA), tolerance (±1%), and SOT-23-3 packaging. The primary difference is RoHS3 compliance and active product status.

Q: What is the difference between LM431BCM3X and LM431BCM3?

A: Both parts share identical electrical specifications and packaging. LM431BCM3X is obsolete, while LM431BCM3 is under Last Time Buy status. For new designs, LM431BCM3X/NOPB or LM431BCM3/NOPB are recommended as active alternatives.

Q: Are AS431HMANTR-G1 and TL431AFDT,215 pin-compatible with LM431BCM3X?

A: Yes. All three parts use SOT-23-3 packaging with identical pinout. AS431HMANTR-G1 and TL431AFDT,215 provide enhanced specifications including extended operating temperature (-40°C ~ 125°C) and improved tolerance characteristics.

Q: What is the impact of the 1V difference in maximum output voltage between LM431BCM3X (37V) and AS431HMANTR-G1/TL431AFDT,215 (36V)?

A: For applications operating below 36V, this difference is not significant. Designs requiring the full 37V maximum output should retain LM431BCM3X/NOPB or LM431BCM3/NOPB.

Q: Does AS431HMANTR-G1 require special handling due to MSL-3 rating?

A: AS431HMANTR-G1 has Moisture Sensitivity Level 3 (168 Hours), requiring controlled storage and handling procedures. LM431BCM3X/NOPB, LM431BCM3/NOPB, and TL431AFDT,215 have MSL-1 (Unlimited) ratings, eliminating moisture sensitivity constraints.

Q: Is TL431AFDT,215 suitable for automotive applications?

A: Yes. TL431AFDT,215 carries AEC-Q100 automotive qualification and is rated for -40°C ~ 125°C operating temperature, making it suitable for automotive power management circuits.

Q: What are the key parameters that determine substitutability for LM431BCM3X?

A: Critical parameters are reference type (Shunt), output type (Adjustable), minimum output voltage (2.495V), output current (100mA), and SOT-23-3 packaging. All listed substitutes maintain these specifications.