AP431ASAG-7 Equivalent & Substitute Parts

Part Overview

The AP431ASAG-7 is a shunt voltage reference IC manufactured by Diodes Incorporated, designed for adjustable voltage regulation applications. This device provides a fixed output voltage of 2.495V with a maximum output of 36V and supports 200 mA output current in a compact SOT-23-3 surface mount package. The AP431ASAG-7 is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	AP431ASAG-7
Manufacturer	Diodes Incorporated
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
Package / Case	SOT-23-3
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the AP431ASAG-7 is determined by the following critical parameters:

Reference Type: Shunt voltage reference
Output Type: Adjustable
Voltage Output Range: 2.495V minimum to 36V maximum
Package: SOT-23-3 surface mount
Tolerance: ±0.5% (primary requirement)
Output Current Capability: Minimum 100 mA (reduced from 200 mA in original)
Operating Temperature Range: Minimum -40°C to 85°C
RoHS3 Compliance: Required

Substitute parts are grouped into two categories:

Category 1: Parametric Equivalents - Parts with identical electrical specifications and package, differing only in manufacturer or product status.

Category 2: Functional Substitutes - Parts with compatible electrical characteristics within acceptable tolerance ranges, same package type, and active product status for long-term availability.

Parameter Comparison

Part Number	Manufacturer	Voltage Output (Min)	Voltage Output (Max)	Current Output	Tolerance	Temp Coefficient	Operating Temp	Package	Product Status
AP431ASAG-7	Diodes Inc.	2.495V	36V	200 mA	±0.5%	30 ppm/°C	-20°C ~ 85°C	SOT-23-3	Obsolete
AN431AN-ATRG1	Diodes Inc.	2.5V	36V	100 mA	±0.5%	20 ppm/°C	-40°C ~ 125°C	SOT-23-3	Active
AP431ARG-7	Diodes Inc.	2.495V	36V	200 mA	±0.5%	30 ppm/°C	-20°C ~ 85°C	SC-59R	Obsolete
TL431AIDBZR	Texas Instruments	2.495V	36V	100 mA	±1%	—	-40°C ~ 85°C	SOT-23-3	Active
TL431AIDBZT	Texas Instruments	2.495V	36V	100 mA	±1%	—	-40°C ~ 85°C	SOT-23-3	Active
TL431BIDBZR	Texas Instruments	2.495V	36V	100 mA	±0.5%	—	-40°C ~ 85°C	SOT-23-3	Active
TL431BIDBZRG4	Texas Instruments	2.495V	36V	100 mA	±0.5%	—	-40°C ~ 85°C	SOT-23-3	Discontinued at DiGi Electronics
TL431BIDBZT	Texas Instruments	2.495V	36V	100 mA	±0.5%	—	-40°C ~ 85°C	SOT-23-3	Active
TL431CDBZR	Texas Instruments	2.495V	36V	100 mA	±2.2%	—	0°C ~ 70°C	SOT-23-3	Active
TL431CDBZT	Texas Instruments	2.495V	36V	100 mA	±2.2%	—	0°C ~ 70°C	SOT-23-3	Active
TL431IDBZR	Texas Instruments	2.495V	36V	100 mA	±2.2%	—	-40°C ~ 85°C	SOT-23-3	Active

Engineering Selection Recommendations

Primary Recommendation: AN431AN-ATRG1

The AN431AN-ATRG1 from Diodes Incorporated is the preferred substitute. It maintains the same manufacturer lineage as the AP431ASAG-7, shares identical tolerance (±0.5%), operates across an extended temperature range (-40°C to 125°C), and holds active product status. The output current is reduced to 100 mA, which is acceptable for most applications where the original 200 mA capability was not fully utilized. This part is ROHS3 compliant and widely available.

Secondary Recommendation: TL431BIDBZR or TL431BIDBZT

Texas Instruments TL431B variants (TL431BIDBZR and TL431BIDBZT) provide equivalent tolerance (±0.5%) and voltage specifications. Both are active products with SOT-23-3 packaging and ROHS3 compliance. The TL431BIDBZR offers superior inventory availability. These parts are suitable for applications requiring strict tolerance control and extended temperature operation (-40°C to 85°C).

Alternative for Cost-Sensitive Applications: TL431IDBZR

The TL431IDBZR operates across the full industrial temperature range (-40°C to 85°C) with active product status. While tolerance is ±2.2%, this part remains compatible with less stringent voltage regulation requirements and provides cost optimization.

Not Recommended: TL431CDBZR and TL431CDBZT

These variants feature reduced operating temperature range (0°C to 70°C) and wider tolerance (±2.2%), making them unsuitable for the original AP431ASAG-7 application profile.

Not Recommended: TL431BIDBZRG4

This part is discontinued at DiGi Electronics, limiting long-term supply chain viability.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with lower output current (100 mA vs. 200 mA)?

A: Yes, if your circuit design does not require the full 200 mA output current capability. The 100 mA rating of substitute parts is sufficient for standard shunt voltage reference applications. Verify your circuit's actual current requirements before selection.

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

A: Both are three-pin surface mount packages with identical electrical performance. SOT-23-3 is the standard designation; SC-59R is an alternative package code for the same physical form factor. They are mechanically and electrically interchangeable.

Q: Why do some substitutes have different tolerance specifications?

A: Tolerance varies by manufacturer and product grade. The AP431ASAG-7 specifies ±0.5% tolerance. Substitutes with ±0.5% tolerance (AN431AN-ATRG1, TL431BIDBZR, TL431BIDBZT) maintain this specification. Parts with ±1% or ±2.2% tolerance are acceptable only if your application permits wider voltage variation.

Q: Is the temperature coefficient important for my application?

A: Temperature coefficient (ppm/°C) affects voltage stability across temperature ranges. The AP431ASAG-7 specifies 30 ppm/°C. The AN431AN-ATRG1 offers improved performance at 20 ppm/°C. For applications operating across wide temperature ranges, lower temperature coefficients provide better voltage regulation stability.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant, matching the original AP431ASAG-7 compliance status.

Q: Which substitute offers the best long-term availability?

A: The AN431AN-ATRG1 and TL431BIDBZR both offer active product status with substantial inventory levels, ensuring long-term supply chain stability. The TL431BIDBZR from Texas Instruments provides the highest inventory availability (125,300 units).

Q: Can I mix different substitute parts in the same production run?

A: While all recommended substitutes are functionally compatible, using a single part number throughout production is preferred for consistency, traceability, and supply chain management. If mixing is necessary, ensure tolerance and temperature specifications are compatible with your circuit requirements.

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