TL431ACLPREG Equivalent & Substitute Parts

Part Overview

The TL431ACLPREG is a shunt voltage reference IC manufactured by onsemi, classified as a Power Management (PMIC) component. This adjustable reference provides a 2.495V output with ±1% tolerance and supports up to 100 mA output current in a TO-92-3 package. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Type	Adjustable
Voltage - Output (Min/Fixed)	2.495V
Voltage - Output (Max)	36V
Current - Output	100 mA
Tolerance	±1%
Temperature Coefficient	50ppm/°C Typical
Current - Cathode	1 mA
Operating Temperature	0°C ~ 70°C (TA)
Package / Case	TO-226-3, TO-92-3
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the TL431ACLPREG is determined by strict electrical and mechanical compatibility across the following parameters:

Critical Matching Parameters:

Reference Type: Shunt
Output Type: Adjustable
Voltage Range: 2.495V minimum output, 36V maximum output
Current Rating: 100 mA output capability
Tolerance: ±1% (or better)
Package: TO-92-3 / TO-226-3 through-hole configuration
Cathode Current: 1 mA minimum

Substitution Categories:

Upgrade Parts maintain identical electrical specifications with active product status and extended temperature ranges or improved availability:

FAN431AZXA (Fairchild Semiconductor)
LM431BCZX (onsemi)
LM431BIZX (onsemi)
TL431AIZ-AP (STMicroelectronics)
TL431AIZT (STMicroelectronics)

Similar Parts offer equivalent functionality with minor parameter variations (tighter tolerance ±0.5%, improved temperature coefficient, or extended operating temperature):

KA431LZTA (onsemi)
AS431AZTR-E1 (Diodes Incorporated)
AS431AZTR-G1 (Diodes Incorporated)
AS431BZTR-E1 (Diodes Incorporated)
AS431BZTR-G1 (Diodes Incorporated)

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage Output (Min/Max)	Tolerance	Temp Coefficient	Operating Temp	Cathode Current	Package
TL431ACLPREG	onsemi	Obsolete	2.495V / 36V	±1%	50ppm/°C	0°C ~ 70°C	1 mA	TO-92-3
FAN431AZXA	Fairchild Semiconductor	Active	2.495V / 36V	±1%	50ppm/°C	-25°C ~ 85°C	1 mA	TO-92-3
LM431BCZX	onsemi	Active	2.495V / 36V	±1%	50ppm/°C	-25°C ~ 85°C	1 mA	TO-92-3
LM431BIZX	onsemi	Active	2.495V / 36V	±1%	50ppm/°C	-40°C ~ 85°C	1 mA	TO-92-3
KA431LZTA	onsemi	Active	2.495V / 36V	±0.5%	50ppm/°C	-25°C ~ 85°C	1 mA	TO-92-3
TL431AIZ-AP	STMicroelectronics	Active	2.495V / 36V	±1%	—	-40°C ~ 105°C	700 µA	TO-92-3
TL431AIZT	STMicroelectronics	Active	2.495V / 36V	±1%	—	-40°C ~ 105°C	700 µA	TO-92-3
AS431AZTR-E1	Diodes Incorporated	Active	2.5V / 36V	±0.5%	20ppm/°C	-40°C ~ 125°C	1 mA	TO-92-3
AS431AZTR-G1	Diodes Incorporated	Active	2.5V / 36V	±0.5%	20ppm/°C	-40°C ~ 125°C	1 mA	TO-92-3
AS431BZTR-E1	Diodes Incorporated	Active	2.5V / 36V	±1%	20ppm/°C	-40°C ~ 125°C	1 mA	TO-92-3
AS431BZTR-G1	Diodes Incorporated	Active	2.5V / 36V	±1%	20ppm/°C	-40°C ~ 125°C	1 mA	TO-92-3

Engineering Selection Recommendations

Direct Upgrade Path (Identical Specifications): LM431BIZX and LM431BCZX from onsemi provide the most direct substitution with identical electrical parameters and active product status. Both maintain ±1% tolerance, 2.495V output, and 100 mA capability. LM431BIZX extends the operating temperature range to -40°C ~ 85°C, providing additional margin for industrial applications.

Cross-Manufacturer Alternatives: FAN431AZXA (Fairchild Semiconductor) and TL431AIZ-AP / TL431AIZT (STMicroelectronics) are functionally equivalent with active status. STMicroelectronics variants offer extended temperature operation to 105°C but operate at reduced cathode current (700 µA vs. 1 mA).

Enhanced Performance Options: KA431LZTA and Diodes Incorporated AS431 series (AZTR-E1, AZTR-G1, BZTR-E1, BZTR-G1) offer tighter tolerance (±0.5% for A-grade) and improved temperature coefficient (20ppm/°C vs. 50ppm/°C). Diodes variants support extended temperature range to 125°C. These are suitable where higher accuracy or wider temperature operation is required.

Compliance Considerations: All substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the original part's regulatory requirements. Moisture Sensitivity Level (MSL) is 1 (Unlimited) for all variants, indicating no special handling requirements.

Frequently Asked Questions (FAQ)

Q: Can I use AS431 series parts as direct replacements for TL431ACLPREG? A: AS431 series parts are functionally compatible with identical output current (100 mA), voltage range (2.5V to 36V), and TO-92-3 packaging. The 2.5V minimum output (vs. 2.495V) and ±0.5% tolerance represent improvements. Extended temperature range (-40°C ~ 125°C) provides additional operational margin. These are suitable substitutes for most applications.

Q: What is the difference between upgrade parts and similar parts? A: Upgrade parts (FAN431AZXA, LM431BCZX, LM431BIZX, TL431AIZ-AP, TL431AIZT) maintain identical electrical specifications to the original TL431ACLPREG with active product status. Similar parts (KA431LZTA, AS431 series) offer enhanced performance characteristics such as tighter tolerance or improved temperature coefficient, making them suitable for applications requiring higher precision or extended operating conditions.

Q: Does cathode current variation affect substitution compatibility? A: Cathode current differences (1 mA vs. 700 µA) do not prevent substitution. Lower cathode current (STMicroelectronics variants at 700 µA) reduces quiescent power consumption, which may be beneficial in battery-powered applications. The reference output voltage and tolerance remain unaffected by this parameter variation.

Q: Are all substitute parts available in the same packaging? A: All listed substitute parts use TO-92-3 / TO-226-3 through-hole packaging, maintaining mechanical and pin compatibility with the original TL431ACLPREG. No PCB layout modifications are required for direct substitution.

Q: Which substitute offers the best temperature stability? A: Diodes Incorporated AS431 series parts provide the lowest temperature coefficient at 20ppm/°C (vs. 50ppm/°C for the original), combined with the widest operating range (-40°C ~ 125°C). This makes them optimal for temperature-sensitive applications requiring high stability across extended environmental conditions.

Q: Can I substitute TL431ACLPREG in a design requiring -40°C operation? A: The original TL431ACLPREG operates only to 0°C minimum, making it unsuitable for -40°C applications. LM431BIZX, TL431AIZ-AP, TL431AIZT, and all Diodes AS431 variants support -40°C operation and are appropriate substitutes for low-temperature environments.

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