TL431ACLPRE3 Equivalent & Substitute Parts

Part Overview

The TL431ACLPRE3 is a shunt voltage reference IC manufactured by Texas Instruments, classified as a Power Management (PMIC) component. This adjustable reference provides a 2.495V to 36V output with ±1% tolerance and 100 mA output current capability in a TO-92-3 through-hole package. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts maintain the same functional classification, electrical specifications, and mechanical compatibility while offering active product status from alternative manufacturers.

Key Parameters

Parameter	Value
Manufacturer Part Number	TL431ACLPRE3
Manufacturer	Texas Instruments
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 (TA)
Mounting Type	Through Hole
Package / Case	TO-226-3, TO-92-3 (TO-226AA) Formed Leads
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the TL431ACLPRE3 is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

Reference Type: Shunt
Output Type: Adjustable
Voltage Range: 2.495V to 36V minimum (2.5V acceptable as functionally equivalent)
Output Current: 100 mA minimum
Tolerance: ±1% or better
Package: TO-92-3 or TO-226-3 (through-hole, identical pinout)

Mechanical Compatibility:

Mounting Type: Through Hole
Supplier Device Package: TO-92-3 or TO-92

Compliance Requirements:

RoHS3 Compliant
REACH Unaffected

Substitute parts are grouped into two categories: direct manufacturer replacements (Texas Instruments TL431ACLPR) and cross-manufacturer equivalents (onsemi KA431AZTA, STMicroelectronics TL431AIZ-AP and TL431AIZT, Diodes Incorporated AS431 and AZ431 series). All listed substitutes meet or exceed the electrical and mechanical specifications of the original part while maintaining active product status.

Parameter Comparison

Part Number	Manufacturer	Voltage Output (Min/Max)	Current Output	Tolerance	Cathode Current	Operating Temp	Product Status	Inventory
TL431ACLPRE3	Texas Instruments	2.495V / 36V	100 mA	±1%	600 µA	0°C ~ 70°C	Obsolete	2,342 Pcs
TL431ACLPR	Texas Instruments	2.495V / 36V	100 mA	±1%	600 µA	0°C ~ 70°C	Active	125,200 Pcs
KA431AZTA	onsemi	2.495V / 36V	100 mA	±1%	1 mA	-25°C ~ 85°C	Active	189,715 Pcs
TL431AIZ-AP	STMicroelectronics	2.495V / 36V	100 mA	±1%	700 µA	-40°C ~ 105°C	Active	3,256 Pcs
TL431AIZT	STMicroelectronics	2.495V / 36V	100 mA	±1%	700 µA	-40°C ~ 105°C	Active	2,300 Pcs
AS431AZTR-E1	Diodes Incorporated	2.5V / 36V	100 mA	±0.5%	1 mA	-40°C ~ 125°C	Active	117,200 Pcs
AS431AZTR-G1	Diodes Incorporated	2.5V / 36V	100 mA	±0.5%	1 mA	-40°C ~ 125°C	Active	150,200 Pcs
AS431BZTR-E1	Diodes Incorporated	2.5V / 36V	100 mA	±1%	1 mA	-40°C ~ 125°C	Active	92,400 Pcs
AS431BZTR-G1	Diodes Incorporated	2.5V / 36V	100 mA	±1%	1 mA	-40°C ~ 125°C	Active	314,400 Pcs
AS431IAZTR-G1	Diodes Incorporated	2.5V / 36V	100 mA	±0.5%	50 µA	-40°C ~ 125°C	Active	56,350 Pcs
AZ431AZ-ATRE1	Diodes Incorporated	2.5V / 36V	100 mA	±0.4%	1 mA	-40°C ~ 125°C	Active	1,300,100 Pcs

Engineering Selection Recommendations

Primary Recommendation: TL431ACLPR The TL431ACLPR from Texas Instruments is the direct active equivalent of the obsolete TL431ACLPRE3. It maintains identical electrical specifications and package configuration while offering active product status and significantly higher inventory availability (125,200 units). This part is the preferred choice for direct replacement in existing designs.

Secondary Recommendations by Application:

For designs requiring extended operating temperature range beyond 0°C to 70°C, the STMicroelectronics TL431AIZ-AP and TL431AIZT offer -40°C to 105°C operation while maintaining all electrical specifications. Both parts are ROHS3 compliant and REACH unaffected.

For applications requiring superior tolerance performance, the Diodes Incorporated AS431 and AZ431 series provide ±0.5% and ±0.4% tolerance respectively, compared to the original ±1%. The AZ431AZ-ATRE1 offers the tightest tolerance (±0.4%) with the largest inventory (1,300,100 units) and extended temperature range (-40°C to 125°C).

The onsemi KA431AZTA provides an alternative cross-manufacturer option with extended temperature range (-25°C to 85°C) and active product status.

All substitute parts are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can I directly replace TL431ACLPRE3 with TL431ACLPR? A: Yes. The TL431ACLPR is the active equivalent manufactured by the same supplier (Texas Instruments) with identical electrical specifications, tolerance, output current, and TO-92-3 package configuration. No circuit modifications are required.

Q: What is the difference between the Diodes Incorporated AS431 and AZ431 series? A: Both series are shunt voltage references in TO-92-3 packages with 100 mA output current. The primary differences are tolerance (AS431 offers ±0.5% or ±1%, AZ431 offers ±0.4%) and cathode current specifications. The AZ431AZ-ATRE1 provides the tightest tolerance at ±0.4%.

Q: Are all substitute parts pin-compatible with the original TL431ACLPRE3? A: Yes. All listed substitutes use the TO-92-3 or TO-226-3 package with identical pinout (TO-226AA formed leads). Direct board-level replacement is possible without PCB modifications.

Q: Which substitute offers the widest operating temperature range? A: The Diodes Incorporated AS431 and AZ431 series, along with the STMicroelectronics TL431AIZ-AP and TL431AIZT, all operate from -40°C to 125°C (or -40°C to 105°C for STMicroelectronics variants), compared to the original 0°C to 70°C range.

Q: Do all substitutes meet RoHS3 and REACH compliance? A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, maintaining regulatory compliance with current environmental standards.

Q: What is the significance of cathode current differences between parts? A: Cathode current specifications (ranging from 50 µA to 1 mA across substitutes) define the minimum operating current required for proper reference operation. The original TL431ACLPRE3 specifies 600 µA. Substitutes with lower cathode current (such as AS431IAZTR-G1 at 50 µA) offer lower quiescent current consumption, beneficial for battery-powered applications.

Q: Which substitute has the highest inventory availability? A: The AZ431AZ-ATRE1 from Diodes Incorporated has the largest inventory at 1,300,100 units, followed by AS431BZTR-G1 at 314,400 units.

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