AP431ASRG-7 Equivalent & Substitute Parts

Part Overview

The AP431ASRG-7 is a shunt voltage reference IC manufactured by Diodes Incorporated, designed for adjustable voltage regulation applications. This component operates with an adjustable output range of 2.495V to 36V, delivering up to 200 mA output current with ±0.5% tolerance. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	AP431ASRG-7
Manufacturer	Diodes Incorporated
Category	Power Management (PMIC)
Reference Type	Shunt
Output Type	Adjustable
Voltage - Output (Min/Fixed)	2.495V
Voltage - Output (Max)	36V
Current - Output	200 mA
Tolerance	±0.5%
Temperature Coefficient	30 ppm/°C
Current - Cathode	500 µA
Operating Temperature	-20°C ~ 85°C (TA)
Package / Case	TO-236-3, SC-59, SOT-23-3
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the AP431ASRG-7 is determined by the following critical parameters:

Output voltage range (minimum and maximum)
Output current capability
Voltage tolerance
Operating temperature range
Package compatibility (SOT-23-3 / TO-236-3 / SC-59)
Product status and availability

Substitute parts are grouped into two categories:

MFR Recommended Substitutes: Parts meeting or exceeding the electrical specifications of the original component with active product status.

Parametric Equivalents: Parts with identical or near-identical electrical characteristics but different packaging or product status.

Parameter Comparison

Parameter	AP431ASRG-7	AS431ANTR-G1	TLV431BFTA	AP431ARG-7	TL431AIDBZR,215	TL431AQDBZR,215
Manufacturer	Diodes Inc.	Diodes Inc.	Diodes Inc.	Diodes Inc.	Nexperia USA Inc.	Nexperia USA Inc.
Voltage - Output (Min)	2.495V	2.5V	1.24V	2.495V	2.495V	2.495V
Voltage - Output (Max)	36V	36V	18V	36V	36V	36V
Current - Output	200 mA	100 mA	15 mA	200 mA	100 mA	100 mA
Tolerance	±0.5%	±0.5%	±0.5%	±0.5%	±1%	±1%
Temperature Coefficient	30 ppm/°C	20 ppm/°C Typical	-	30 ppm/°C	-	-
Current - Cathode	500 µA	1 mA	100 µA	500 µA	600 µA	600 µA
Operating Temperature	-20°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C	-20°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C
Package / Case	SOT-23-3	SOT-23-3	SOT-23-3	SC-59R	TO-236AB	TO-236AB
Product Status	Obsolete	Active	Active	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

AS431ANTR-G1 is the primary MFR recommended substitute. It maintains the same ±0.5% tolerance and 36V maximum output voltage as the original part. Output current is reduced to 100 mA, which is acceptable for applications not requiring the full 200 mA capability. This part has active product status and extended operating temperature range (-40°C ~ 125°C), providing superior long-term availability and thermal performance.

TL431AIDBZR,215 and TL431AQDBZR,215 are active alternatives from Nexperia USA Inc. Both maintain the 2.495V minimum output voltage and 36V maximum output voltage. Output current is 100 mA. Tolerance is ±1%, which is less precise than the original ±0.5% specification. TL431AQDBZR,215 includes automotive qualification (AEC-Q100) and extended temperature range (-40°C ~ 125°C), suitable for automotive and industrial applications.

AP431ARG-7 is a parametric equivalent with identical electrical specifications to the original part, including 200 mA output current and ±0.5% tolerance. However, it uses SC-59R packaging instead of SOT-23R and carries obsolete product status, limiting its suitability for new designs.

TLV431BFTA is not recommended as a direct substitute. The maximum output voltage is limited to 18V, which is insufficient for applications requiring the full 36V range of the original part. Output current is also significantly reduced to 15 mA.

Frequently Asked Questions (FAQ)

Q: Can AS431ANTR-G1 replace AP431ASRG-7 in all applications?

A: AS431ANTR-G1 is suitable for most applications. The primary difference is reduced output current (100 mA vs. 200 mA). Applications requiring the full 200 mA output current must use AP431ARG-7 or verify that 100 mA is sufficient for the design.

Q: What is the difference between SOT-23-3 and SC-59R packaging?

A: Both are surface-mount packages for the same component family. SOT-23-3 and SC-59 are physically compatible and functionally equivalent. The "R" designation indicates tape-and-reel packaging format. PCB footprints are compatible between these package types.

Q: Why do TL431AIDBZR,215 and TL431AQDBZR,215 have ±1% tolerance instead of ±0.5%?

A: These are Nexperia parts with different design specifications. The ±1% tolerance is acceptable for most voltage reference applications. Applications requiring ±0.5% precision should use AS431ANTR-G1 or AP431ARG-7.

Q: Is TL431AQDBZR,215 suitable for automotive applications?

A: Yes. TL431AQDBZR,215 carries AEC-Q100 automotive qualification and extended operating temperature range (-40°C ~ 125°C), making it suitable for automotive and industrial environments.

Q: Can TLV431BFTA be used as a substitute?

A: TLV431BFTA is not a suitable substitute. The 18V maximum output voltage is insufficient for applications requiring the 36V range of the original part. Use only if your application operates below 18V output voltage.

Q: What is the impact of different cathode current specifications?

A: Cathode current (500 µA to 1 mA) affects the minimum load current required for stable operation. Higher cathode current requires higher minimum load current. For most applications, this difference is not critical, but verify in designs with very light load conditions.

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