AP431WG-7 Equivalent & Substitute Parts

Part Overview

The AP431WG-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 200 mA output current with ±1% tolerance in an SC-59-3 surface mount package. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	AP431WG-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	±1%
Temperature Coefficient	30 ppm/°C
Current - Cathode	500 µA
Operating Temperature	-20°C ~ 85°C
Package / Case	TO-236-3, SC-59, SOT-23-3
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the AP431WG-7 is determined by the following critical parameters:

Reference Type: Shunt (all substitutes must be shunt voltage references)
Output Type: Adjustable (voltage output must be adjustable)
Voltage Range: Minimum 2.495V output capability, maximum 36V
Package Compatibility: TO-236-3, SC-59, or SOT-23-3 surface mount packages
Tolerance: ±1% or better (tighter tolerance acceptable)
Output Current: Minimum 100 mA (original part rated 200 mA; lower-rated substitutes acceptable if application current requirements are met)
Operating Temperature: Minimum -40°C to 85°C range (extended range acceptable)
Compliance: ROHS3 compliant, REACH unaffected

Substitute parts are grouped into two categories: manufacturer-recommended direct substitutes from Diodes Incorporated and Texas Instruments alternatives that meet the electrical and mechanical requirements.

Parameter Comparison

Part Number	Manufacturer	Voltage Output (Min)	Voltage Output (Max)	Current Output	Tolerance	Temp Coefficient	Cathode Current	Operating Temp	Package	Product Status
AP431WG-7	Diodes Inc.	2.495V	36V	200 mA	±1%	30 ppm/°C	500 µA	-20°C ~ 85°C	SC-59-3	Obsolete
AS431BNTR-E1	Diodes Inc.	2.5V	36V	100 mA	±1%	20 ppm/°C	1 mA	-40°C ~ 125°C	SOT-23-3	Active
TL431AIDBZR	Texas Instruments	2.495V	36V	100 mA	±1%	—	700 µA	-40°C ~ 85°C	SOT-23-3	Active
TL431AIDBZT	Texas Instruments	2.495V	36V	100 mA	±1%	—	700 µA	-40°C ~ 85°C	SOT-23-3	Active
TL431BIDBZR	Texas Instruments	2.495V	36V	100 mA	±0.5%	—	700 µA	-40°C ~ 85°C	SOT-23-3	Active
TL431BIDBZRG4	Texas Instruments	2.495V	36V	100 mA	±0.5%	—	700 µA	-40°C ~ 85°C	SOT-23-3	Discontinued at DiGi Electronics
TL431BIDBZT	Texas Instruments	2.495V	36V	100 mA	±0.5%	—	700 µA	-40°C ~ 85°C	SOT-23-3	Active
TL431IDBZR	Texas Instruments	2.495V	36V	100 mA	±2.2%	—	1 mA	-40°C ~ 85°C	SOT-23-3	Active
TL431IDBZRG4	Texas Instruments	2.495V	36V	100 mA	±2.2%	—	1 mA	-40°C ~ 85°C	SOT-23-3	Discontinued at DiGi Electronics
TL431IDBZT	Texas Instruments	2.495V	36V	100 mA	±2.2%	—	1 mA	-40°C ~ 85°C	SOT-23-3	Active

Engineering Selection Recommendations

Primary Recommendation: AS431BNTR-E1

The AS431BNTR-E1 from Diodes Incorporated is the manufacturer-recommended substitute. It maintains the same ±1% tolerance as the original AP431WG-7, operates across an extended temperature range (-40°C to 125°C), and is currently in active production status. While output current is reduced to 100 mA, this is acceptable for applications where the original 200 mA specification exceeds actual circuit requirements. The part is ROHS3 compliant and REACH unaffected.

Secondary Recommendations: Texas Instruments TL431 Series

Texas Instruments TL431 variants provide functional equivalence with active product status and superior availability. Selection within this family depends on tolerance requirements:

TL431AIDBZR / TL431AIDBZT: ±1% tolerance, matching the original specification
TL431BIDBZR / TL431BIDBZT: ±0.5% tolerance, suitable for applications requiring tighter voltage regulation
TL431IDBZR / TL431IDBZT: ±2.2% tolerance, acceptable where relaxed tolerance is permissible

All TL431 variants operate at -40°C to 85°C, are ROHS3 compliant, and are available in active production status (except G4 variants, discontinued at DiGi Electronics). Packaging differences between IDBZR (Cut Tape) and IDBZT (Cut Tape) variants do not affect electrical performance.

Parts to Avoid:

TL431BIDBZRG4 and TL431IDBZRG4 are discontinued at DiGi Electronics and should not be selected for new designs requiring long-term supply assurance.

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 requires less than 100 mA output current. The substitute parts are rated for 100 mA continuous output, which is sufficient for most shunt voltage reference applications. Verify your actual circuit current requirements before selection.

Q: What is the difference between TL431IDBZR and TL431AIDBZR?

A: The primary difference is tolerance specification. TL431AIDBZR maintains ±1% tolerance matching the original AP431WG-7, while TL431IDBZR has ±2.2% tolerance. Both are functionally equivalent shunt voltage references with identical voltage range and package. Select based on your circuit's voltage regulation accuracy requirements.

Q: Are the SOT-23-3 and SC-59-3 packages pin-compatible?

A: Yes. Both designations refer to the same three-pin surface mount package (TO-236-3). The substitute parts in SOT-23-3 packaging are directly compatible with the original SC-59-3 footprint.

Q: Why does AS431BNTR-E1 have a lower cathode current specification (1 mA vs. 500 µA)?

A: Higher cathode current in the substitute indicates slightly different internal circuit design. This does not affect substitutability. The part remains functionally equivalent for shunt voltage reference applications. Verify your bias network design accommodates the specified cathode current range.

Q: Can I use TL431BIDBZR (±0.5% tolerance) as a direct replacement?

A: Yes. The ±0.5% tolerance is tighter than the original ±1% specification, making it a superior substitute for applications requiring improved voltage regulation accuracy. No circuit redesign is necessary; the part is a direct functional replacement.

Q: What is the difference between Cut Tape (CT) and Tape & Reel (TR) packaging?

A: Cut Tape and Tape & Reel refer to supply format, not electrical performance. Both contain identical components. Select based on your procurement and assembly process requirements. Cut Tape is suitable for lower-volume applications; Tape & Reel is standard for high-volume production.

Q: Is the extended operating temperature range of AS431BNTR-E1 (-40°C to 125°C) a concern?

A: No. Extended temperature range is a design advantage, not a limitation. If your application operates within -20°C to 85°C, the AS431BNTR-E1 remains fully qualified. The wider range provides additional design margin and flexibility for future applications.

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