TL431ASDT,215 Equivalent & Substitute Parts

Part Overview

The TL431ASDT,215 is a shunt voltage reference IC manufactured by NXP USA Inc., designed for adjustable voltage regulation applications. This component provides a fixed output voltage of 2.495V with a maximum output of 36V, delivering up to 100 mA of output current with ±1% tolerance. The device is housed in a SOT-23 (TO-236AB) surface mount package and is qualified to AEC-Q100 automotive standards.

The TL431ASDT,215 is currently listed as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this shunt voltage reference.

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	600 µA
Operating Temperature	-40°C ~ 125°C (TA)
Package / Case	TO-236-3, SC-59, SOT-23-3
Grade	Automotive
Qualification	AEC-Q100
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the TL431ASDT,215 is determined by the following critical parameters:

Primary Substitution Criteria:

Reference type: Shunt
Output type: Adjustable
Voltage output range: 2.495V to 36V minimum
Output current: 100 mA minimum
Package compatibility: SOT-23-3 / TO-236-3
Surface mount mounting type
Operating temperature range: -40°C to 125°C minimum

Secondary Compatibility Factors:

Tolerance specification (±1% or better)
Cathode current specifications
RoHS3 compliance
Automotive grade and AEC-Q100 qualification (where applicable)

Substitute parts are grouped into two categories: direct equivalents with identical electrical specifications and compatible alternatives with equivalent or superior performance characteristics within the allowed parameter ranges.

Parameter Comparison

Part Number	Manufacturer	Status	Voltage Output (Min)	Voltage Output (Max)	Current Output	Tolerance	Cathode Current	Operating Temp	Package	Grade
TL431ASDT,215	NXP USA Inc.	Obsolete	2.495V	36V	100 mA	±1%	600 µA	-40°C ~ 125°C	SOT-23	Automotive / AEC-Q100
TL431AFDT,215	Nexperia USA Inc.	Active	2.495V	36V	100 mA	±1%	600 µA	-40°C ~ 125°C	TO-236AB	Automotive / AEC-Q100
TL431AQDBZR	Texas Instruments	Active	2.495V	36V	100 mA	±1%	700 µA	-40°C ~ 125°C	SOT-23-3	Standard
TL431AQDBZRG4	Texas Instruments	Discontinued at DiGi Electronics	2.495V	36V	100 mA	±1%	700 µA	-40°C ~ 125°C	SOT-23-3	Standard
TL431AQDBZRQ1	Texas Instruments	Active	2.495V	36V	100 mA	±1%	700 µA	-40°C ~ 125°C	SOT-23-3	Automotive / AEC-Q100
TL431AQDBZT	Texas Instruments	Active	2.495V	36V	100 mA	±1%	700 µA	-40°C ~ 125°C	SOT-23-3	Standard
AN431AN-ATRE1	Diodes Incorporated	Active	2.5V	36V	100 mA	±0.5%	1 mA	-40°C ~ 125°C	SOT-23-3	Standard
AN431AN-ATRG1	Diodes Incorporated	Active	2.5V	36V	100 mA	±0.5%	1 mA	-40°C ~ 125°C	SOT-23-3	Standard
AN431BN-ATRE1	Diodes Incorporated	Active	2.5V	36V	100 mA	±1%	1 mA	-40°C ~ 125°C	SOT-23-3	Standard
AN431BN-ATRG1	Diodes Incorporated	Active	2.5V	36V	100 mA	±1%	1 mA	-40°C ~ 125°C	SOT-23-3	Standard
ATL431AIDBZR	Texas Instruments	Active	2.5V	36V	100 mA	±1%	35 µA	-40°C ~ 85°C	SOT-23-3	Standard

Engineering Selection Recommendations

Primary Recommendation - Direct Equivalent:

TL431AFDT,215 (Nexperia USA Inc.) is the closest direct equivalent to the obsolete TL431ASDT,215. This part maintains identical electrical specifications including 2.495V minimum output voltage, 36V maximum output, 100 mA output current, ±1% tolerance, and 600 µA cathode current. The device is AEC-Q100 qualified for automotive applications and is currently in active production status with substantial inventory availability (59,126 units).

Secondary Recommendations - Automotive Grade:

TL431AQDBZRQ1 (Texas Instruments) is an active automotive-grade alternative with AEC-Q100 qualification. While cathode current is specified at 700 µA (versus 600 µA), all other electrical parameters remain compatible. This part is actively produced and maintains the required operating temperature range.

Alternative Substitutes - Standard Grade:

TL431AQDBZR and TL431AQDBZT (Texas Instruments) provide compatible electrical performance but are classified as standard grade without automotive qualification. These parts are suitable for non-automotive applications requiring equivalent shunt voltage reference functionality.

AN431BN-ATRE1 and AN431BN-ATRG1 (Diodes Incorporated) offer ±1% tolerance matching with improved cathode current specifications (1 mA). The minimum output voltage is specified at 2.5V, which is compatible with the 2.495V requirement of the original part.

Enhanced Performance Alternative:

AN431AN-ATRE1 and AN431AN-ATRG1 (Diodes Incorporated) provide superior ±0.5% tolerance with identical output current and voltage range specifications. These parts are suitable for applications requiring tighter voltage regulation accuracy.

Limited Temperature Range Alternative:

ATL431AIDBZR (Texas Instruments) operates within a reduced temperature range (-40°C to 85°C) and features significantly lower cathode current (35 µA). This part is appropriate only for applications not requiring the full -40°C to 125°C operating range.

Frequently Asked Questions (FAQ)

Q: Can TL431AFDT,215 be used as a direct replacement for TL431ASDT,215?

A: Yes. TL431AFDT,215 is a direct equivalent with identical electrical specifications, package type, and automotive qualification. The part is manufactured by Nexperia USA Inc. (successor to NXP's reference IC business) and maintains full compatibility.

Q: What is the difference between TL431AQDBZR and TL431AQDBZRQ1?

A: TL431AQDBZRQ1 includes AEC-Q100 automotive qualification, while TL431AQDBZR is standard grade. Both parts share identical electrical specifications. Selection depends on automotive application requirements.

Q: Are Diodes Incorporated AN431 series parts compatible with the TL431ASDT,215?

A: Yes, with parameter considerations. AN431BN-ATRE1 and AN431BN-ATRG1 maintain ±1% tolerance and identical output current specifications. The minimum output voltage is specified at 2.5V versus 2.495V, which is functionally compatible. Cathode current is higher at 1 mA. AN431AN series parts offer superior ±0.5% tolerance for applications requiring tighter regulation.

Q: What packaging options are available for substitutes?

A: All substitute parts are available in SOT-23-3 / TO-236-3 surface mount packages, maintaining mechanical compatibility with the original TL431ASDT,215. Packaging variants include Cut Tape (CT) & Digi-Reel® and Tape & Reel (TR) formats.

Q: Does cathode current variation affect circuit design?

A: Cathode current specifications range from 35 µA to 1 mA across substitute options. The original TL431ASDT,215 specifies 600 µA. Higher cathode current requirements may impact bias network design. ATL431AIDBZR features significantly lower cathode current (35 µA) and is suitable only for applications not requiring the full operating temperature range.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance, matching the environmental compliance status of the original TL431ASDT,215.

Q: Which substitute is recommended for new automotive designs?

A: TL431AQDBZRQ1 (Texas Instruments) is recommended for new automotive designs, providing active production status, AEC-Q100 qualification, and full operating temperature range support. TL431AFDT,215 (Nexperia) is the preferred option if direct NXP lineage is required.

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