AP431G-13 Equivalent & Substitute Parts

Part Overview

The AP431G-13 is a shunt voltage reference IC manufactured by Diodes Incorporated, designed for adjustable output voltage regulation in power management applications. This component provides a 2.495V adjustable output with ±1% tolerance across a 36V maximum operating range and supports 200 mA output current. The part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain functional compatibility while meeting current availability and compliance standards.

Key Parameters

Parameter	Value
Manufacturer Part Number	AP431G-13
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	8-SOIC (0.154", 3.90mm Width)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the AP431G-13 are grouped based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

Reference Type: Shunt (all substitutes maintain this classification)
Output Type: Adjustable (all substitutes provide adjustable output)
Voltage Range: Minimum output 2.495V to 2.5V; maximum output 36V to 37V
Current Output: Minimum 100 mA (note: AP431G-13 specifies 200 mA; substitutes provide 100 mA)
Tolerance: ±1% to ±2% acceptable range
Package: 8-SOIC form factor (mechanical compatibility)
Mounting Type: Surface Mount

Substitution Logic: Parts are considered equivalent when they maintain the same shunt reference architecture, adjustable output voltage range, and 8-SOIC package footprint. Tolerance variations (±1% vs ±2%) and temperature coefficient differences are acceptable within engineering design margins. Current output reduction from 200 mA to 100 mA represents a functional limitation that must be evaluated against circuit requirements. Operating temperature range variations are noted but do not prevent substitution in applications within the overlapping temperature window.

Parameter Comparison

Parameter	AP431G-13	AS431HMANTR-G1	KA431DTF	LM431ACMX	LM431AIMX	LM431BCMX	LM431CIMX	TL431ACD	TL431ACDG	TL431ACDR
Manufacturer	Diodes Inc.	Diodes Inc.	onsemi	National Semi.	National Semi.	National Semi.	onsemi	STMicroelectronics	onsemi	Texas Instruments
Reference Type	Shunt	Shunt	Shunt	Shunt	Shunt	Shunt	Shunt	Shunt	Shunt	Shunt
Output Type	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable
Voltage - Output (Min/Fixed)	2.495V	2.495V	2.5V	2.5V	2.5V	2.495V	2.495V	2.495V	2.495V	2.495V
Voltage - Output (Max)	36V	36V	36V	36V	36V	36V	36V	36V	36V	36V
Current - Output	200 mA	100 mA	100 mA	100 mA	100 mA	100 mA	100 mA	100 mA	100 mA	100 mA
Tolerance	±1%	±0.5%	±2%	±2%	±2%	±1%	±0.5%	±1%	±1%	±1%
Temperature Coefficient	30 ppm/°C	20 ppm/°C	50 ppm/°C	50 ppm/°C	50 ppm/°C	50 ppm/°C	50 ppm/°C	—	50 ppm/°C	—
Current - Cathode	500 µA	500 µA	1 mA	1 mA	1 mA	1 mA	1 mA	600 µA	1 mA	600 µA
Operating Temperature	-20°C ~ 85°C	-40°C ~ 125°C	-25°C ~ 85°C	-25°C ~ 85°C	-40°C ~ 85°C	-25°C ~ 85°C	-40°C ~ 85°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C
Package / Case	8-SOIC	SOT-23-3	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Vendor Undefined	RoHS non-compliant	Vendor Undefined	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Package Compatibility Consideration: The AS431HMANTR-G1 uses SOT-23-3 packaging, which differs from the 8-SOIC form factor of the AP431G-13. This part is not recommended for direct PCB footprint replacement without layout redesign.

Active Product Status Priority: For new designs and production continuity, prioritize active status parts: AS431HMANTR-G1, KA431DTF, LM431ACMX, LM431AIMX, LM431BCMX, LM431CIMX, TL431ACDG, and TL431ACDR. These parts offer current manufacturer support and established supply chains.

Compliance Requirements: For applications requiring ROHS3 compliance, select from: AS431HMANTR-G1, KA431DTF, LM431CIMX, TL431ACD, TL431ACDG, or TL431ACDR. The LM431AIMX is RoHS non-compliant and should be avoided in regulated applications.

Current Output Limitation: All substitute parts provide 100 mA maximum output current, compared to the AP431G-13's 200 mA specification. Circuit designs must accommodate this reduced current capacity. Applications requiring 200 mA output current cannot use these substitutes without additional external current amplification.

Temperature Range Matching: The AS431HMANTR-G1 offers the widest operating temperature range (-40°C ~ 125°C), suitable for extended temperature applications. Parts with 0°C ~ 70°C ranges (TL431ACD, TL431ACDG, TL431ACDR) have the most restricted operating windows and should be selected only when application temperatures fall within these limits.

Tolerance and Stability Trade-offs: AS431HMANTR-G1 and LM431CIMX provide ±0.5% tolerance with improved temperature coefficients (20 ppm/°C and 50 ppm/°C respectively), offering superior voltage regulation stability. Parts with ±2% tolerance (KA431DTF, LM431ACMX, LM431AIMX) are acceptable for less stringent regulation requirements.

Frequently Asked Questions (FAQ)

Q: Can the AP431G-13 be directly replaced with any of these substitute parts?

A: Direct replacement is possible only with 8-SOIC packaged substitutes that maintain the same pinout and electrical characteristics. The AS431HMANTR-G1 uses SOT-23-3 packaging and requires PCB layout modification. All other 8-SOIC substitutes are mechanically compatible but have reduced current output (100 mA vs 200 mA).

Q: What is the impact of reduced current output from 200 mA to 100 mA?

A: The 100 mA output current of substitute parts limits the maximum load current that can be sourced from the reference output. Applications designed for 200 mA operation must be re-evaluated. If higher current is required, external current amplification circuitry must be added to the design.

Q: Are there compliance differences between substitute parts?

A: Yes. Most substitutes are ROHS3 compliant, but LM431AIMX is RoHS non-compliant and LM431ACMX has vendor-undefined RoHS status. For regulated applications requiring RoHS compliance, select from the ROHS3 compliant options.

Q: Which substitute offers the best temperature stability?

A: The AS431HMANTR-G1 provides the lowest temperature coefficient (20 ppm/°C typical) and widest operating range (-40°C ~ 125°C), making it the best choice for temperature-sensitive applications. However, its SOT-23-3 package requires layout redesign.

Q: Can I use TL431ACD, TL431ACDG, or TL431ACDR in applications below 0°C?

A: No. These parts have a minimum operating temperature of 0°C. For applications requiring operation below 0°C, select from AS431HMANTR-G1, LM431AIMX, or LM431CIMX, which support -40°C or -20°C minimum temperatures.

Q: What is the difference between ±1% and ±2% tolerance specifications?

A: Tolerance defines the maximum deviation of output voltage from the nominal 2.495V or 2.5V specification. ±1% tolerance allows ±24.95 mV deviation; ±2% allows ±49.9 mV deviation. Applications requiring tighter voltage regulation should use ±1% or ±0.5% tolerance parts.

Q: Are all substitute parts available in the same packaging options?

A: No. Most 8-SOIC substitutes are available in standard packaging (Tape & Reel, Bulk, Tube). The AS431HMANTR-G1 is available in Cut Tape and Digi-Reel packaging. Verify packaging availability with your supplier for production requirements.

Q: Which substitute has the lowest cathode current requirement?

A: The AS431HMANTR-G1 and AP431G-13 both specify 500 µA cathode current. Most other substitutes require 1 mA cathode current, with TL431ACD and TL431ACDR at 600 µA. Lower cathode current reduces power consumption in the reference circuit.

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