AP431VL-A Equivalent & Substitute Parts

Part Overview

The AP431VL-A is a shunt voltage reference IC manufactured by Diodes Incorporated, designed for adjustable voltage regulation applications. This through-hole TO-92 packaged component provides an adjustable output range from 2.495V to 36V with ±1% tolerance and 200 mA output capability. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts maintain the core shunt reference functionality while offering improved availability, extended temperature ranges, or enhanced specifications.

Key Parameters

Parameter	Value
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
Operating Temperature	-20°C ~ 85°C
Mounting Type	Through Hole
Package / Case	TO-92-3 (TO-226AA)
Current - Cathode	500 µA
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the AP431VL-A is determined by the following critical parameters:

Reference Type & Output Type: All substitutes must be shunt-type adjustable voltage references
Voltage Range: Output must span minimum 2.495V to maximum 36V
Package Compatibility: Through-hole TO-92-3 (TO-226AA) package required for direct mechanical and electrical compatibility
Tolerance & Accuracy: ±1% tolerance or better acceptable
Output Current: Minimum 100 mA required; 200 mA preferred for full compatibility
Temperature Range: Operating range must encompass or exceed -20°C to 85°C
Compliance: ROHS3 compliance and EAR99 classification maintained across all substitutes

Substitute parts are grouped into two categories: Active Status Parts (recommended for new designs and production) and Obsolete Status Parts (acceptable for legacy system support with inventory availability).

Parameter Comparison

Part Number	Manufacturer	Status	Output (Min/Max)	Current - Output	Tolerance	Temp Coeff	Temp Range	Package	Cathode Current
AP431VL-A	Diodes Inc.	Obsolete	2.495V / 36V	200 mA	±1%	30 ppm/°C	-20°C ~ 85°C	TO-92-3	500 µA
AS431BZTR-E1	Diodes Inc.	Active	2.5V / 36V	100 mA	±1%	20 ppm/°C	-40°C ~ 125°C	TO-92-3	1 mA
KA431AZTA	onsemi	Active	2.495V / 36V	100 mA	±1%	50 ppm/°C	-25°C ~ 85°C	TO-92-3	1 mA
KA431LZTA	onsemi	Active	2.495V / 36V	100 mA	±0.5%	50 ppm/°C	-25°C ~ 85°C	TO-92-3	1 mA
LM431ACZ	onsemi	Active	2.5V / 36V	100 mA	±2%	50 ppm/°C	-25°C ~ 85°C	TO-92-3	1 mA
TL431ACLPRAG	onsemi	Active	2.495V / 36V	100 mA	±1%	50 ppm/°C	0°C ~ 70°C	TO-92-3	1 mA
TL431ACLPRE3	Texas Instruments	Obsolete	2.495V / 36V	100 mA	±1%	—	0°C ~ 70°C	TO-92-3	600 µA
TL431ACLPRPG	onsemi	Active	2.495V / 36V	100 mA	±1%	50 ppm/°C	0°C ~ 70°C	TO-92-3	1 mA
TL431AFDT,215	Nexperia USA Inc.	Active	2.495V / 36V	100 mA	±1%	—	-40°C ~ 125°C	TO-236AB (SMD)	600 µA
TL431AILPRAG	onsemi	Active	2.495V / 36V	100 mA	±1%	50 ppm/°C	-40°C ~ 85°C	TO-92-3	1 mA
TL431AILPRPG	onsemi	Obsolete	2.495V / 36V	100 mA	±1%	50 ppm/°C	-40°C ~ 85°C	TO-92-3	1 mA

Engineering Selection Recommendations

For Active Production & New Designs:

Select from active-status parts with TO-92-3 through-hole packaging: AS431BZTR-E1, KA431AZTA, KA431LZTA, LM431ACZ, TL431ACLPRAG, TL431ACLPRPG, or TL431AILPRAG. These parts maintain ROHS3 compliance and EAR99 classification. AS431BZTR-E1 and TL431AILPRAG offer extended temperature ranges (-40°C to 125°C and -40°C to 85°C respectively), suitable for demanding environments. KA431LZTA provides superior tolerance (±0.5%) for precision applications.

For Legacy System Support:

TL431ACLPRE3 and TL431AILPRPG remain available despite obsolete status, with adequate inventory for maintenance and repair applications. Both maintain ±1% tolerance and TO-92-3 packaging.

Package Consideration:

TL431AFDT,215 is a surface-mount alternative (TO-236AB/SOT-23-3) with automotive qualification (AEC-Q100) and extended temperature range (-40°C to 125°C). This part is not mechanically compatible with through-hole designs but serves as an equivalent for surface-mount redesigns.

Output Current Trade-off:

The AP431VL-A specifies 200 mA output current. All substitute parts provide 100 mA output. Applications requiring the full 200 mA specification must evaluate circuit design to confirm 100 mA sufficiency or consider alternative reference architectures.

Frequently Asked Questions (FAQ)

Q: Can I directly replace AP431VL-A with any of these substitutes?

A: Direct mechanical and electrical replacement is possible with any active-status part in TO-92-3 package: AS431BZTR-E1, KA431AZTA, KA431LZTA, LM431ACZ, TL431ACLPRAG, TL431ACLPRPG, and TL431AILPRAG. All maintain the same pinout, voltage range, and tolerance specifications. Output current is reduced from 200 mA to 100 mA across all substitutes; verify your circuit design accommodates this reduction.

Q: What is the difference between ±1% and ±0.5% tolerance?

A: Tolerance defines the accuracy of the output voltage at room temperature. KA431LZTA with ±0.5% tolerance provides tighter voltage regulation than ±1% parts, reducing output voltage variation by half. Select ±0.5% for precision voltage reference applications; ±1% is acceptable for general regulation tasks.

Q: Why do some parts have different temperature coefficients?

A: Temperature coefficient (ppm/°C) measures output voltage drift across the operating temperature range. Lower values indicate better stability. AP431VL-A specifies 30 ppm/°C; most substitutes specify 50 ppm/°C typical. For applications sensitive to temperature-induced voltage drift, compare the total voltage change across your operating range: (Max Temp - Min Temp) × Temperature Coefficient.

Q: Is TL431AFDT,215 compatible with my through-hole design?

A: No. TL431AFDT,215 uses TO-236AB surface-mount packaging (SOT-23-3), incompatible with through-hole PCB layouts. This part is suitable only for surface-mount board redesigns. For through-hole applications, select from TO-92-3 packaged alternatives.

Q: Can I use obsolete-status parts in production?

A: Obsolete parts (AP431VL-A, TL431ACLPRE3, TL431AILPRPG) carry inventory availability risk. Use obsolete parts only for legacy system maintenance where active alternatives are unsuitable. For new production, select active-status parts to ensure long-term supply continuity.

Q: What does "Current - Cathode" mean?

A: Cathode current is the minimum operating current required to maintain regulation. AP431VL-A requires 500 µA minimum; most substitutes require 1 mA. Ensure your circuit design provides adequate cathode current for proper device operation.

Q: Are all these parts RoHS3 compliant?

A: Yes. All listed parts maintain ROHS3 compliance and EAR99 export classification, meeting environmental and regulatory requirements for commercial and industrial applications.

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