TL432BCDBZR Equivalent & Substitute Parts

Part Overview

The TL432BCDBZR is an adjustable shunt voltage reference IC manufactured by Texas Instruments, designed for precision voltage regulation and reference applications. This SOT-23-3 surface mount component operates across a 2.495V to 36V output range with ±0.5% tolerance and 100 mA output capability. The part is active in production status and widely used in power management circuits requiring stable voltage references.

Equivalent and substitute parts are necessary when the primary part faces supply constraints, extended lead times, or when design flexibility permits selection from multiple qualified manufacturers offering compatible electrical and mechanical characteristics.

Key Parameters

Parameter	Value
Manufacturer Part Number	TL432BCDBZR
Manufacturer	Texas Instruments
Reference Type	Shunt
Output Type	Adjustable
Voltage - Output (Min/Fixed)	2.495V
Voltage - Output (Max)	36V
Current - Output	100 mA
Tolerance	±0.5%
Current - Cathode	600 µA
Operating Temperature	0°C ~ 70°C
Package / Case	TO-236-3, SC-59, SOT-23-3
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitution eligibility for the TL432BCDBZR is determined by the following critical parameters:

Electrical Compatibility Requirements:

Output voltage range: 2.495V minimum to 36V maximum
Output current capability: 100 mA
Tolerance: ±0.5% (exact match required for this specification level)
Reference type: Shunt
Output type: Adjustable

Mechanical Compatibility Requirements:

Package: SOT-23-3 (TO-236-3, SC-59)
Mounting type: Surface Mount

Compliance Requirements:

RoHS3 Compliant
Active product status

Substitute parts are grouped into two categories based on tolerance specification:

Category A - Exact Tolerance Match (±0.5%): Parts meeting the identical ±0.5% tolerance specification with compatible electrical and mechanical parameters.

Category B - Relaxed Tolerance (±1% or ±0.4%): Parts with tolerance specifications outside the ±0.5% requirement. These are listed for reference but represent design trade-offs in voltage accuracy.

Parameter Comparison

Parameter	TL432BCDBZR	AS431ANTR-E1	AS431ANTR-G1	AS431BNTR-G1	AS431HANTR-G1	AS431IANTR-G1	AS431IBNTR-G1	AZ431AN-ATRE1	AZ431AN-ATRG1	AZ431BN-ATRE1	LM431SACM32X
Manufacturer	Texas Instruments	Diodes Inc.	Diodes Inc.	Diodes Inc.	Diodes Inc.	Diodes Inc.	Diodes Inc.	Diodes Inc.	Diodes Inc.	Diodes Inc.	Fairchild Semi.
Reference Type	Shunt	Shunt	Shunt	Shunt	Shunt	Shunt	Shunt	Shunt	Shunt	Shunt	Shunt
Output Type	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable
Voltage - Output (Min/Fixed)	2.495V	2.5V	2.5V	2.5V	2.495V	2.5V	2.5V	2.5V	2.5V	2.5V	2.5V
Voltage - Output (Max)	36V	36V	36V	36V	36V	36V	36V	36V	36V	36V	36V
Current - Output	100 mA	100 mA	100 mA	100 mA	100 mA	100 mA	100 mA	100 mA	100 mA	100 mA	100 mA
Tolerance	±0.5%	±0.5%	±0.5%	±1%	±0.5%	±0.5%	±1%	±0.4%	±0.4%	±0.8%	±2%
Current - Cathode	600 µA	1 mA	1 mA	1 mA	500 µA	50 µA	50 µA	1 mA	1 mA	1 mA	1 mA
Operating Temperature	0°C ~ 70°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-25°C ~ 85°C
Package / Case	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Direct Equivalents (±0.5% Tolerance Match):

AS431HANTR-G1 and AS431IANTR-G1 from Diodes Incorporated provide the closest electrical equivalence to TL432BCDBZR. Both maintain ±0.5% tolerance, 100 mA output current, and SOT-23-3 packaging. AS431HANTR-G1 offers 500 µA cathode current (closer to the 600 µA specification), while AS431IANTR-G1 operates with 50 µA cathode current. Both are RoHS3 compliant and active in production.

Extended Temperature Range Alternatives:

AS431ANTR-E1 and AS431ANTR-G1 (Diodes Incorporated) maintain ±0.5% tolerance with extended operating temperature range (-40°C to 125°C versus 0°C to 70°C). These parts are suitable for applications requiring broader thermal performance while preserving voltage accuracy specifications.

Tighter Tolerance Options:

AZ431AN-ATRE1 and AZ431AN-ATRG1 (Diodes Incorporated) offer ±0.4% tolerance, providing improved voltage accuracy over the ±0.5% specification. Both maintain 100 mA output current and SOT-23-3 packaging with extended temperature range.

Relaxed Tolerance Alternatives:

AS431BNTR-G1 and AS431IBNTR-G1 (Diodes Incorporated) feature ±1% tolerance with 100 mA output current and SOT-23-3 packaging. These are applicable where voltage accuracy requirements are less stringent. AZ431BN-ATRE1 offers ±0.8% tolerance as an intermediate option.

LM431SACM32X (Fairchild Semiconductor) provides ±2% tolerance with narrower operating temperature range (-25°C to 85°C). This part is suitable only for applications where ±2% voltage accuracy is acceptable.

All listed substitutes maintain RoHS3 compliance and active product status, ensuring regulatory alignment and supply continuity.

Frequently Asked Questions (FAQ)

Q: Can AS431ANTR-G1 directly replace TL432BCDBZR in my circuit?

A: Yes, AS431ANTR-G1 is electrically compatible. Both parts share ±0.5% tolerance, 100 mA output current, 2.5V to 36V output range, and SOT-23-3 packaging. The primary difference is operating temperature range: AS431ANTR-G1 extends to -40°C to 125°C versus TL432BCDBZR's 0°C to 70°C. Cathode current differs (1 mA versus 600 µA), which may affect circuit biasing in sensitive applications.

Q: What is the difference between AS431HANTR-G1 and AS431IANTR-G1?

A: Both maintain ±0.5% tolerance and SOT-23-3 packaging. AS431HANTR-G1 specifies 500 µA cathode current (closer to TL432BCDBZR's 600 µA), while AS431IANTR-G1 operates at 50 µA cathode current. Selection depends on circuit biasing requirements and minimum cathode current specifications in your design.

Q: Why do some substitutes have ±1% or ±2% tolerance instead of ±0.5%?

A: Tolerance specifications reflect manufacturing precision grades. Parts with relaxed tolerance (±1%, ±2%) are suitable for applications where voltage accuracy requirements are less stringent. If your circuit requires ±0.5% accuracy, select only parts matching this specification: TL432BCDBZR, AS431ANTR-E1, AS431ANTR-G1, AS431HANTR-G1, AS431IANTR-G1, AZ431AN-ATRE1, or AZ431AN-ATRG1.

Q: Are all substitute parts RoHS3 compliant?

A: Yes, all listed substitute parts are RoHS3 compliant and active in production status, meeting current regulatory requirements for electronic component manufacturing.

Q: Can I use AZ431AN-ATRE1 if my design specifies TL432BCDBZR?

A: AZ431AN-ATRE1 is compatible from an electrical and mechanical standpoint. It offers tighter tolerance (±0.4% versus ±0.5%) and extended temperature range (-40°C to 125°C). If your circuit design does not require the specific 0°C to 70°C temperature range or the exact 600 µA cathode current of TL432BCDBZR, AZ431AN-ATRE1 is a suitable upgrade.

Q: What is the significance of cathode current differences between parts?

A: Cathode current affects the minimum operating current required to maintain regulation. TL432BCDBZR specifies 600 µA, while most Diodes Incorporated alternatives specify 1 mA or lower. In circuits with tight biasing constraints or low-current applications, cathode current differences may impact circuit performance. Verify your design's minimum cathode current requirement against the selected substitute part.

Q: Is LM431SACM32X suitable as a substitute?

A: LM431SACM32X is mechanically compatible (SOT-23-3 package) but differs significantly in tolerance (±2% versus ±0.5%) and operating temperature range (-25°C to 85°C). This part is suitable only for applications where ±2% voltage accuracy is acceptable and operating temperature remains within -25°C to 85°C.

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