TL431BVDR2 Equivalent & Substitute Parts

Part Overview

The TL431BVDR2 is a shunt voltage reference IC manufactured by onsemi, classified as a Power Management (PMIC) component. This adjustable reference device operates across a 2.495V to 36V output range with ±0.4% tolerance and supports 100 mA output current in an 8-SOIC surface mount package. The main part number is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design requirements and production continuity.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Type	Adjustable
Voltage - Output (Min/Fixed)	2.495V
Voltage - Output (Max)	36V
Current - Output	100 mA
Tolerance	±0.4%
Temperature Coefficient	50ppm/°C Typical
Current - Cathode	1 mA
Operating Temperature	-40°C ~ 125°C (TA)
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitute parts for the TL431BVDR2 are classified based on electrical and mechanical compatibility within the following criteria:

Direct Equivalents maintain identical electrical specifications: adjustable shunt reference, 2.495V minimum output, 36V maximum output, 100 mA output current, ±0.4% tolerance, 50ppm/°C temperature coefficient, and 8-SOIC package. These parts differ only in packaging format (Tape & Reel vs. bulk) or product status (Active vs. Obsolete).

Similar Substitutes share the same reference type, output type, voltage range, current rating, and package, but differ in tolerance specification (±0.5%, ±1%, or ±2%) or operating temperature range. These parts are electrically compatible for applications where the tighter tolerance of the original is not critical.

Parametric Equivalents maintain all electrical specifications of the original but include automotive-grade qualification (AEC-Q100) and extended temperature range support, suitable for automotive and industrial applications.

Cross-Manufacturer Equivalents from Texas Instruments and National Semiconductor provide functional equivalence with minor variations in output voltage specification (2.5V vs. 2.495V) or tolerance grades, maintaining the same package and core electrical characteristics.

Parameter Comparison

Part Number	Manufacturer	Voltage Output (Min)	Tolerance	Operating Temp	Packaging	Product Status	RoHS Status
TL431BVDR2	onsemi	2.495V	±0.4%	-40°C ~ 125°C	8-SOIC	Obsolete	RoHS non-compliant
TL431BVDR2G	onsemi	2.495V	±0.4%	-40°C ~ 125°C	8-SOIC (Tape & Reel)	Active	ROHS3 Compliant
KA431DTF	onsemi	2.5V	±2%	-25°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
LM431AIMX	National Semiconductor	2.5V	±2%	-40°C ~ 85°C	8-SOIC (Bulk)	Active	RoHS non-compliant
LM431BCMX	National Semiconductor	2.495V	±1%	-25°C ~ 85°C	8-SOIC	Active	Vendor Undefined
LM431CIMX	onsemi	2.495V	±0.5%	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
NCV431BVDR2G	onsemi	2.495V	±0.4%	-40°C ~ 125°C	8-SOIC (Tape & Reel)	Active	ROHS3 Compliant
TL1431QD	Texas Instruments	2.5V	±0.4%	-40°C ~ 125°C	8-SOIC (Tube)	Active	ROHS3 Compliant
TL1431QDR	Texas Instruments	2.5V	±0.4%	-40°C ~ 125°C	8-SOIC (Cut Tape & Digi-Reel)	Active	ROHS3 Compliant
TL1431QDRG4	Texas Instruments	2.5V	±0.4%	-40°C ~ 125°C	8-SOIC	Discontinued at DiGi Electronics	ROHS3 Compliant
TL431BQDR	Texas Instruments	2.495V	±0.5%	-40°C ~ 125°C	8-SOIC (Tape & Reel)	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: TL431BVDR2G

The TL431BVDR2G is the direct equivalent of the obsolete TL431BVDR2, maintaining identical electrical specifications (2.495V output, ±0.4% tolerance, 100 mA current, -40°C to 125°C operating range) and 8-SOIC package. This part is currently active with ROHS3 compliance and Tape & Reel packaging, making it the preferred choice for direct replacement in production designs.

Secondary Recommendation: NCV431BVDR2G

The NCV431BVDR2G provides identical electrical performance to the original part with automotive-grade qualification (AEC-Q100) and extended temperature support. This option is suitable for automotive and industrial applications requiring enhanced reliability certifications.

Alternative for Relaxed Tolerance Requirements: LM431CIMX

The LM431CIMX offers ±0.5% tolerance (compared to ±0.4%) with ROHS3 compliance and active product status. This substitute is appropriate for applications where the slightly relaxed tolerance specification does not impact circuit performance.

Cross-Manufacturer Options: TL1431QDR or TL1431QD

Texas Instruments TL1431 series parts (TL1431QDR or TL1431QD) provide ±0.4% tolerance matching the original specification with 2.5V output and full -40°C to 125°C operating range. These parts maintain ROHS3 compliance and active status, offering supply diversity from an alternative manufacturer.

Not Recommended: KA431DTF and LM431AIMX

The KA431DTF and LM431AIMX feature ±2% tolerance, which represents a significant relaxation from the original ±0.4% specification. These parts are suitable only for applications with loose tolerance requirements and should not be used as direct replacements without circuit re-evaluation.

Frequently Asked Questions (FAQ)

Q: Can I use TL431BVDR2G as a direct replacement for TL431BVDR2?

A: Yes. The TL431BVDR2G is electrically and mechanically identical to the TL431BVDR2, differing only in packaging format (Tape & Reel) and product status (Active vs. Obsolete). It is the recommended direct replacement.

Q: What is the difference between TL431BVDR2G and NCV431BVDR2G?

A: Both parts maintain identical electrical specifications. The NCV431BVDR2G includes automotive-grade qualification (AEC-Q100) and is designated for automotive and industrial applications. Select NCV431BVDR2G if automotive compliance is required.

Q: Can I substitute a part with ±2% tolerance for the original ±0.4% specification?

A: Substitution depends on circuit requirements. The ±2% tolerance parts (KA431DTF, LM431AIMX) represent a five-fold relaxation in accuracy. Use these only if your application tolerates this variance without re-evaluation of circuit performance.

Q: Are all substitute parts available in the same 8-SOIC package?

A: Yes. All listed substitute parts use the 8-SOIC (0.154", 3.90mm Width) surface mount package, ensuring mechanical compatibility with existing PCB layouts.

Q: What is the significance of ROHS3 compliance?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements. The original TL431BVDR2 is RoHS non-compliant. Most active substitutes (TL431BVDR2G, NCV431BVDR2G, TL1431 series) are ROHS3 compliant, making them suitable for applications with environmental compliance requirements.

Q: Can I use Texas Instruments TL1431 parts instead of onsemi TL431 parts?

A: Yes. The TL1431QDR and TL1431QD from Texas Instruments provide functional equivalence with ±0.4% tolerance and identical operating temperature range. The primary difference is a 2.5V output specification versus the original 2.495V, which is negligible for most applications.

Q: What is the difference between packaging options (Tape & Reel, Tube, Cut Tape)?

A: Packaging format affects handling and automation compatibility. Tape & Reel and Cut Tape formats are suitable for automated assembly. Tube packaging is used for manual handling. Select based on your manufacturing process requirements. Electrical performance is identical across all packaging formats.

Q: Is the LM431CIMX a suitable substitute?

A: The LM431CIMX is suitable if your application tolerates ±0.5% tolerance (compared to the original ±0.4%). It offers ROHS3 compliance and active product status with a slightly relaxed operating temperature range (-40°C to 85°C vs. -40°C to 125°C).

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