TL431ACLPE3 Equivalent & Substitute Parts

Part Overview

The TL431ACLPE3 is a shunt voltage reference IC manufactured by Texas Instruments, designed for adjustable voltage regulation applications. This device provides a fixed output voltage of 2.495V with a maximum output of 36V and supports 100 mA output current. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

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%
Current - Cathode	600 µA
Operating Temperature	0°C ~ 70°C
Mounting Type	Through Hole
Package / Case	TO-226-3, TO-92-3
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the TL431ACLPE3 is determined by the following critical parameters:

Core Electrical Parameters:

Reference Type: Shunt
Output Type: Adjustable
Voltage Output Range: 2.495V minimum to 36V maximum
Output Current: 100 mA
Tolerance: ±1% (or better)

Physical Parameters:

Mounting Type: Through Hole
Package: TO-92-3 (TO-226-3)

Compliance Requirements:

RoHS3 Compliant
REACH Unaffected

Substitute parts are grouped into two categories: direct equivalents (same tolerance and output voltage specifications) and upgraded alternatives (improved tolerance or extended temperature range). All substitutes maintain the same shunt reference topology, adjustable output configuration, and through-hole mounting requirement.

Parameter Comparison

Part Number	Manufacturer	Voltage Output (Min)	Voltage Output (Max)	Current Output	Tolerance	Cathode Current	Operating Temp	Package	Status
TL431ACLPE3	Texas Instruments	2.495V	36V	100 mA	±1%	600 µA	0°C ~ 70°C	TO-92-3	Obsolete
TL431ACLP	onsemi	2.495V	36V	100 mA	±1%	1 mA	-25°C ~ 85°C	TO-92-3	Obsolete
KA431AZBU	Fairchild Semiconductor	2.495V	36V	100 mA	±1%	1 mA	-25°C ~ 85°C	TO-92-3	Active
TL431AIZ	STMicroelectronics	2.495V	36V	100 mA	±1%	700 µA	-40°C ~ 105°C	TO-92-3	Active
LT1431CZ#PBF	Analog Devices Inc.	2.5V	36V	100 mA	±0.4%	1 mA	0°C ~ 70°C	TO-92-3	Active
LT1431IZ#PBF	Analog Devices Inc.	2.5V	36V	100 mA	±0.4%	1 mA	-40°C ~ 85°C	TO-92-3	Active
TL1431ACZ	STMicroelectronics	2.5V	36V	100 mA	±0.25%	600 µA	-20°C ~ 70°C	TO-92-2	Active
TL1431IZ	STMicroelectronics	2.5V	36V	100 mA	±0.4%	1 mA	-40°C ~ 105°C	TO-92-2	Active
TL431ACLPG	onsemi	2.495V	36V	100 mA	±1%	1 mA	0°C ~ 70°C	TO-92-3	Active
TL431ACZ	Fairchild Semiconductor	2.495V	36V	100 mA	±1%	600 µA	0°C ~ 70°C	TO-92-2	Obsolete
TL431AFDT,215	Nexperia USA Inc.	2.495V	36V	100 mA	±1%	600 µA	-40°C ~ 125°C	TO-236-3 (SOT-23)	Active

Engineering Selection Recommendations

Direct Equivalents (Same Electrical Specifications):

TL431ACLPG (onsemi) is the primary direct equivalent, maintaining identical output voltage (2.495V), tolerance (±1%), and current specifications. This part is currently active and provides the closest functional match with extended temperature range (-25°C to 85°C in the ACLP variant).

TL431ACZ (Fairchild Semiconductor) provides equivalent electrical performance but is obsolete. Use only if existing inventory is available and no active alternatives are suitable.

Active Substitutes with Identical Core Specifications:

KA431AZBU (Fairchild Semiconductor) is an active part with identical electrical parameters and extended operating temperature range (-25°C to 85°C).

TL431AIZ (STMicroelectronics) maintains all core specifications with extended temperature range (-40°C to 105°C) and is actively produced.

Upgraded Alternatives (Improved Tolerance):

LT1431CZ#PBF and LT1431IZ#PBF (Analog Devices Inc.) offer improved tolerance of ±0.4% compared to the original ±1%, with identical voltage and current ratings. These are suitable for applications requiring tighter voltage regulation.

TL1431ACZ and TL1431IZ (STMicroelectronics) provide even tighter tolerance of ±0.25% to ±0.4%, though these use TO-92-2 package configuration (two leads instead of three).

Surface Mount Alternative:

TL431AFDT,215 (Nexperia USA Inc.) is a surface-mount variant in SOT-23 package with automotive qualification (AEC-Q100) and extended temperature range (-40°C to 125°C). Use only if PCB redesign for surface-mount assembly is acceptable.

All recommended substitutes are RoHS3 compliant and REACH unaffected.

Frequently Asked Questions (FAQ)

Q: Can I use LT1431 series parts as direct replacements for TL431ACLPE3?

A: LT1431 series parts are functionally compatible but use a different base product number (LT1431 vs. TL431). They maintain the same shunt reference topology, adjustable output configuration, and through-hole TO-92-3 mounting. However, some LT1431 variants use TO-92-2 package (two leads) instead of TO-92-3 (three leads), requiring PCB layout verification.

Q: What is the difference between ±1% and ±0.4% tolerance?

A: Tolerance specifies the accuracy of the output voltage. ±1% tolerance allows the output voltage to vary by 1% from the nominal value, while ±0.4% tolerance provides tighter regulation. For applications requiring precise voltage references, upgraded alternatives with ±0.4% tolerance are recommended.

Q: Are all substitute parts RoHS3 compliant?

A: All active substitute parts listed are RoHS3 compliant. Obsolete parts (TL431ACLP, TL431ACZ) may have limited RoHS documentation; verify compliance with your supplier if required for your application.

Q: Can I use the surface-mount TL431AFDT,215 instead of the through-hole TL431ACLPE3?

A: TL431AFDT,215 is electrically equivalent but requires surface-mount assembly and SOT-23 package footprint. This substitution requires PCB redesign and is only suitable if your manufacturing process supports surface-mount components.

Q: What is the significance of cathode current specifications?

A: Cathode current (ranging from 600 µA to 1 mA) represents the minimum operating current required for proper device operation. Higher cathode current requirements may affect circuit design and power consumption. Verify that your application circuit can supply the required cathode current for the selected substitute.

Q: Which substitute offers the widest operating temperature range?

A: TL431AFDT,215 (Nexperia) offers the widest operating temperature range of -40°C to 125°C, followed by TL1431IZ (STMicroelectronics) at -40°C to 105°C. The original TL431ACLPE3 operates from 0°C to 70°C.

Q: Are there any package compatibility issues between substitutes?

A: Most substitutes use TO-92-3 package, which is directly compatible with the original TL431ACLPE3. However, TL1431ACZ and TL1431IZ use TO-92-2 package (two leads instead of three), and TL431AFDT,215 uses SOT-23 surface-mount package. Verify package pinout and PCB footprint compatibility before selection.

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