TL431CLPRE3 Equivalent & Substitute Parts

Part Overview

The TL431CLPRE3 is a shunt voltage reference IC manufactured by Texas Instruments, designed for adjustable voltage regulation applications. This component operates with an adjustable output range of 2.495V to 36V, delivering up to 100 mA output current with ±2.2% tolerance. The device is packaged in TO-92-3 (TO-226AA) through-hole configuration and is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	TL431CLPRE3
Category	Power Management (PMIC)
Reference Type	Shunt
Output Type	Adjustable
Voltage Output (Min/Fixed)	2.495V
Voltage Output (Max)	36V
Current Output	100 mA
Tolerance	±2.2%
Current Cathode	1 mA
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 TL431CLPRE3 is determined by the following critical parameters:

Electrical Compatibility Requirements:

Reference Type: Shunt
Output Type: Adjustable
Voltage Output Range: 2.495V to 36V minimum
Current Output: 100 mA minimum
Tolerance: ±2.2% or better
Current Cathode: 1 mA or lower
Operating Temperature: Must support 0°C ~ 70°C minimum

Mechanical Compatibility Requirements:

Mounting Type: Through Hole
Package / Case: TO-92-3 (TO-226AA) or compatible TO-92 variants
Pin configuration must support direct replacement

Compliance Requirements:

RoHS3 Compliant
REACH Unaffected

Substitute parts are grouped into two categories: direct replacements (same manufacturer, active status) and cross-manufacturer alternatives (equivalent electrical specifications, enhanced performance characteristics).

Parameter Comparison

Part Number	Manufacturer	Voltage Output (Min)	Voltage Output (Max)	Current Output	Tolerance	Current Cathode	Operating Temperature	Package	Product Status
TL431CLPRE3	Texas Instruments	2.495V	36V	100 mA	±2.2%	1 mA	0°C ~ 70°C	TO-92-3	Obsolete
TL431CLPR	Texas Instruments	2.495V	36V	100 mA	±2.2%	1 mA	0°C ~ 70°C	TO-92-3	Active
TL431IZ-AP	STMicroelectronics	2.495V	36V	100 mA	±2.21%	1 mA	-40°C ~ 105°C	TO-92-3	Active
TL431IZT	STMicroelectronics	2.495V	36V	100 mA	±2.21%	1 mA	-40°C ~ 105°C	TO-92-3	Active
AS431AZTR-E1	Diodes Incorporated	2.5V	36V	100 mA	±0.5%	1 mA	-40°C ~ 125°C	TO-92-3	Active
AS431AZTR-G1	Diodes Incorporated	2.5V	36V	100 mA	±0.5%	1 mA	-40°C ~ 125°C	TO-92-3	Active
AS431BZTR-E1	Diodes Incorporated	2.5V	36V	100 mA	±1%	1 mA	-40°C ~ 125°C	TO-92-3	Active
AS431BZTR-G1	Diodes Incorporated	2.5V	36V	100 mA	±1%	1 mA	-40°C ~ 125°C	TO-92-3	Active
AS431IAZTR-G1	Diodes Incorporated	2.5V	36V	100 mA	±0.5%	50 µA	-40°C ~ 125°C	TO-92-3	Active
AZ431AZ-ATRE1	Diodes Incorporated	2.5V	36V	100 mA	±0.4%	1 mA	-40°C ~ 125°C	TO-92-3	Active
AZ431AZ-ATRG1	Diodes Incorporated	2.5V	36V	100 mA	±0.4%	1 mA	-40°C ~ 125°C	TO-92-3	Active

Engineering Selection Recommendations

Primary Recommendation: TL431CLPR

The TL431CLPR is the direct successor to the TL431CLPRE3, manufactured by Texas Instruments. This part maintains identical electrical specifications (2.495V to 36V output, 100 mA current, ±2.2% tolerance) and mechanical compatibility (TO-92-3 package). The TL431CLPR is currently in active production status with 34,043 units in stock, ensuring supply continuity. Both parts are ROHS3 compliant and REACH unaffected, making this the optimal choice for direct replacement in existing designs.

Secondary Recommendation: STMicroelectronics TL431 Series (TL431IZ-AP, TL431IZT)

The STMicroelectronics TL431IZ-AP and TL431IZT offer equivalent electrical performance with ±2.21% tolerance and expanded operating temperature range (-40°C ~ 105°C). These parts maintain the same 100 mA output current and TO-92-3 package configuration. Both are in active production with adequate inventory (3,200 and 5,644 units respectively). Selection of these parts is appropriate when extended temperature operation is required beyond the original 0°C ~ 70°C specification.

Alternative Recommendation: Diodes Incorporated AS431 and AZ431 Series

The Diodes Incorporated AS431 and AZ431 series provide enhanced performance characteristics with improved tolerance specifications (±0.4% to ±0.5% versus ±2.2%). These parts maintain the 100 mA output current and TO-92-3 package compatibility. Operating temperature range extends to -40°C ~ 125°C. The AS431IAZTR-G1 variant features reduced cathode current (50 µA versus 1 mA), beneficial for low-power applications. All variants are in active production with substantial inventory availability (56,350 to 1,410,100 units). These parts are suitable for applications requiring tighter voltage regulation accuracy or extended temperature operation.

All recommended substitutes maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory compatibility with the original TL431CLPRE3.

Frequently Asked Questions (FAQ)

Q: Can I directly replace TL431CLPRE3 with TL431CLPR?

A: Yes. The TL431CLPR is the active production equivalent of the obsolete TL431CLPRE3. Both parts share identical electrical specifications (2.495V to 36V output, 100 mA current, ±2.2% tolerance), mechanical packaging (TO-92-3), and compliance certifications. Direct pin-for-pin replacement is supported without circuit modification.

Q: What is the difference between TL431CLPR and the STMicroelectronics TL431IZ-AP?

A: Both parts deliver equivalent voltage regulation performance with nearly identical tolerance (±2.2% versus ±2.21%). The primary difference is operating temperature range: TL431CLPR operates 0°C ~ 70°C, while TL431IZ-AP operates -40°C ~ 105°C. Select TL431IZ-AP if your application requires extended temperature operation. Both maintain TO-92-3 package compatibility and 100 mA output current.

Q: Why would I choose Diodes Incorporated AS431 or AZ431 over Texas Instruments TL431?

A: The Diodes Incorporated AS431 and AZ431 series offer tighter tolerance specifications (±0.4% to ±0.5% versus ±2.2%), resulting in improved voltage regulation accuracy. These parts also provide extended operating temperature range (-40°C ~ 125°C) and are available in higher quantities. The AS431IAZTR-G1 variant features reduced cathode current (50 µA), advantageous for low-power circuit designs. Selection depends on accuracy requirements and thermal operating conditions of your application.

Q: Are all substitute parts compatible with the original TO-92-3 package footprint?

A: Yes. All recommended substitute parts are packaged in TO-92-3 (TO-226AA) through-hole configuration, maintaining mechanical and pin compatibility with the TL431CLPRE3. Direct PCB footprint compatibility is supported without layout modification.

Q: What compliance certifications apply to these substitute parts?

A: All substitute parts listed maintain ROHS3 compliance and REACH unaffected status, matching the regulatory certifications of the original TL431CLPRE3. No compliance risk exists when substituting between these parts.

Q: Can I use AS431IAZTR-G1 in place of TL431CLPRE3 if my circuit requires lower cathode current?

A: Yes, with circuit verification. The AS431IAZTR-G1 features 50 µA cathode current versus the 1 mA specification of TL431CLPRE3. This reduced current consumption is beneficial for low-power applications. However, verify that your circuit design does not depend on the higher cathode current for proper biasing or regulation performance. Electrical specifications for voltage output (2.5V to 36V) and current output (100 mA) remain compatible.

Q: What inventory considerations should I evaluate when selecting a substitute?

A: Current inventory levels vary significantly across substitute options. TL431CLPR (34,043 units), AS431BZTR-G1 (314,400 units), and AZ431AZ-ATRE1 (1,300,100 units) offer substantial stock availability. STMicroelectronics variants (TL431IZ-AP: 3,200 units; TL431IZT: 5,644 units) and AZ431AZ-ATRG1 (1,410 units) have more limited availability. Evaluate lead time and supply chain requirements for your production schedule.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message