TL431AQDBZRG4 Equivalent & Substitute Parts

Part Overview

The TL431AQDBZRG4 is a shunt voltage reference IC manufactured by Texas Instruments, designed for adjustable voltage regulation applications. This part operates with an adjustable output range from 2.495V to 36V, delivering up to 100 mA with ±1% tolerance in a SOT-23-3 surface mount package. The TL431AQDBZRG4 is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives that maintain electrical and mechanical compatibility for ongoing production and repair applications.

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	±1%
Current - Cathode	700 µA
Operating Temperature	-40°C ~ 125°C
Package / Case	SOT-23-3
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the TL431AQDBZRG4 is determined by the following critical parameters: reference type (shunt), output type (adjustable), voltage output range (minimum 2.495V to maximum 36V or higher), current output capability (100 mA), tolerance specification (±1% or better), package type (SOT-23-3), and operating temperature range (-40°C to 125°C or wider). Parts meeting these electrical and mechanical specifications are functionally equivalent for direct replacement. Variations in cathode current, temperature coefficient, and manufacturer do not preclude substitution when all primary parameters align.

Parameter Comparison

Parameter	TL431AQDBZRG4	TL431AQDBZR	LM431BIM3/NOPB	LM431BIM3X/NOPB	TL431AFDT,215	TL431AQDBZR,215	AN431AN-ATRE1	AN431AN-ATRG1	AN431BN-ATRE1	AN431BN-ATRG1	AZ431AN-ATRE1
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Nexperia USA Inc.	Nexperia USA Inc.	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated
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	2.495V	2.495V	2.495V	2.495V	2.495V	2.5V	2.5V	2.5V	2.5V	2.5V
Voltage - Output (Max)	36V	36V	37V	37V	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	±1%	±1%	±1%	±1%	±1%	±1%	±0.5%	±0.5%	±1%	±1%	±0.4%
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°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
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
Product Status	Discontinued	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For direct replacement of the discontinued TL431AQDBZRG4, the TL431AQDBZR from Texas Instruments is the primary equivalent, maintaining identical electrical specifications and active product status. This part is available in higher inventory (41,400 units) and preserves all critical parameters including voltage range, current capacity, tolerance, and operating temperature.

The Nexperia USA Inc. variants TL431AFDT,215 and TL431AQDBZR,215 provide automotive-grade alternatives with AEC-Q100 qualification, suitable for applications requiring automotive compliance. These parts maintain the same electrical specifications with slightly lower cathode current (600 µA versus 700 µA).

Diodes Incorporated parts AN431AN-ATRE1, AN431AN-ATRG1, AN431BN-ATRE1, AN431BN-ATRG1, and AZ431AN-ATRE1 are functionally compatible substitutes. The AN431 series with ±0.5% tolerance and AZ431 series with ±0.4% tolerance offer improved accuracy compared to the original ±1% specification. All Diodes Incorporated parts maintain the required voltage range, current capacity, and operating temperature specifications.

The LM431BIM3/NOPB and LM431BIM3X/NOPB from Texas Instruments are compatible alternatives with slightly extended maximum voltage output (37V versus 36V) and reduced operating temperature range (-40°C to 85°C). These parts are suitable for applications not requiring the full 125°C upper temperature limit.

All substitute parts are ROHS3 compliant and maintain SOT-23-3 package compatibility, ensuring direct PCB placement without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can the TL431AQDBZR directly replace the discontinued TL431AQDBZRG4?

A: Yes. The TL431AQDBZR is the direct equivalent, maintaining identical electrical specifications including 2.495V to 36V output range, 100 mA current capacity, ±1% tolerance, and -40°C to 125°C operating temperature. Both use SOT-23-3 packaging and are ROHS3 compliant.

Q: What is the difference between TL431 and LM431 variants?

A: Both are Texas Instruments shunt voltage reference ICs with equivalent electrical performance. The LM431 series operates at a reduced maximum temperature of 85°C compared to 125°C for TL431, and exhibits a specified temperature coefficient of 50ppm/°C. The LM431 maximum output voltage is 37V versus 36V for TL431.

Q: Are Diodes Incorporated AN431 and AZ431 parts suitable replacements?

A: Yes. All Diodes Incorporated variants maintain the required shunt reference type, adjustable output, 2.5V minimum voltage, 36V maximum voltage, 100 mA current capacity, and SOT-23-3 package. The AN431 series offers ±0.5% tolerance and AZ431 offers ±0.4% tolerance, both superior to the original ±1% specification. All operate across -40°C to 125°C.

Q: Do packaging differences exist between substitute parts?

A: All listed substitutes use SOT-23-3 (TO-236-3, SC-59) surface mount packaging. Nexperia parts are supplied in TO-236AB variant designation, which is mechanically and electrically equivalent to SOT-23-3. No package conversion is required for PCB assembly.

Q: Which substitute offers the best accuracy?

A: The AZ431AN-ATRE1 from Diodes Incorporated provides the tightest tolerance at ±0.4%, followed by AN431 variants at ±0.5%. The original TL431AQDBZRG4 and most direct equivalents specify ±1% tolerance.

Q: Are automotive-qualified alternatives available?

A: Yes. The Nexperia USA Inc. parts TL431AFDT,215 and TL431AQDBZR,215 carry AEC-Q100 automotive qualification and are suitable for automotive applications requiring this certification.

Q: What inventory considerations apply to these substitutes?

A: The AZ431AN-ATRE1 offers the highest inventory availability at 9,425,400 units. AN431AN-ATRE1 provides 180,200 units. Texas Instruments TL431AQDBZR offers 41,400 units. All substitutes maintain active product status with consistent supply.

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