TL431CLPE3 Equivalent & Substitute Parts

Part Overview

The TL431CLPE3 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-226-3) through-hole configuration and operates across the 0°C to 70°C temperature range.

The TL431CLPE3 is classified as obsolete. Identifying equivalent and substitute parts is essential for ongoing production support, design updates, and inventory management when original stock becomes unavailable.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Type	Adjustable
Voltage Output (Min/Fixed)	2.495V
Voltage Output (Max)	36V
Output Current	100 mA
Tolerance	±2.2%
Cathode Current	1 mA
Operating Temperature	0°C to 70°C
Mounting Type	Through Hole
Package	TO-92-3 (TO-226-3)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the TL431CLPE3 is determined by the following critical parameters:

Reference Type: Must be Shunt
Output Type: Must be Adjustable
Voltage Range: Output voltage capability must encompass or match 2.495V to 36V
Output Current: Must support 100 mA minimum
Tolerance: Acceptable range ±2.2% or better (lower tolerance values are acceptable)
Cathode Current: Must operate at or below 1 mA minimum requirement
Package: TO-92-3 or TO-226-3 through-hole configuration
Operating Temperature: Must support at least 0°C to 70°C range

Parts meeting these criteria are classified as direct substitutes. Parts with enhanced specifications (lower tolerance, wider temperature range, active product status) are classified as upgrades.

Parameter Comparison

Part Number	Manufacturer	Voltage Output (Min)	Voltage Output (Max)	Output Current	Tolerance	Cathode Current	Operating Temp	Package	Status
TL431CLPE3	Texas Instruments	2.495V	36V	100 mA	±2.2%	1 mA	0°C to 70°C	TO-92-3	Obsolete
TL431CLP	onsemi	2.495V	36V	100 mA	±2.2%	1 mA	0°C to 70°C	TO-92-3	Obsolete
TL431IZ	STMicroelectronics	2.495V	36V	100 mA	±2.21%	1 mA	-40°C to 105°C	TO-92-3	Active
KA431AZBU	Fairchild Semiconductor	2.495V	36V	100 mA	±1%	1 mA	-25°C to 85°C	TO-92-3	Active
LM431AIZ	Fairchild Semiconductor	2.5V	36V	100 mA	±2%	1 mA	-40°C to 85°C	TO-92-3	Active
LT1431CZ#PBF	Analog Devices Inc.	2.5V	36V	100 mA	±0.4%	1 mA	0°C to 70°C	TO-92-3	Active
LT1431IZ#PBF	Analog Devices Inc.	2.5V	36V	100 mA	±0.4%	1 mA	-40°C to 85°C	TO-92-3	Active
TL1431ACZ	STMicroelectronics	2.5V	36V	100 mA	±0.25%	600 µA	-20°C to 70°C	TO-92-3	Active
TL1431IZ	STMicroelectronics	2.5V	36V	100 mA	±0.4%	1 mA	-40°C to 105°C	TO-92-3	Active
TL431ACLPG	onsemi	2.495V	36V	100 mA	±1%	1 mA	0°C to 70°C	TO-92-3	Active
TL431ACZ	Fairchild Semiconductor	2.495V	36V	100 mA	±1%	600 µA	0°C to 70°C	TO-92-3	Obsolete

Engineering Selection Recommendations

Direct Substitutes (Equivalent Performance)

TL431CLP (onsemi) provides electrical and thermal equivalence to the TL431CLPE3. Both devices share identical voltage output specifications (2.495V to 36V), current ratings (100 mA), tolerance (±2.2%), and operating temperature range (0°C to 70°C). The primary difference is manufacturer and product status; TL431CLP is also obsolete. This substitute is suitable for applications where exact parameter matching is required and product status is not a constraint.

Active Product Substitutes (Recommended for New Designs)

TL431IZ (STMicroelectronics) is an active product offering equivalent electrical performance with enhanced temperature range (-40°C to 105°C). Tolerance specification is ±2.21%, meeting the ±2.2% requirement. This part is suitable for designs requiring active product support and extended operating temperature capability.

TL431ACLPG (onsemi) is an active product with ±1% tolerance, superior to the original ±2.2% specification. Operating temperature range matches the original (0°C to 70°C). This substitute provides improved accuracy for applications sensitive to voltage reference precision.

KA431AZBU (Fairchild Semiconductor) is an active product with ±1% tolerance and operating range of -25°C to 85°C. This part offers improved tolerance specification while maintaining compatibility with the original voltage and current parameters.

Upgrade Options (Enhanced Specifications)

LT1431CZ#PBF and LT1431IZ#PBF (Analog Devices Inc.) offer ±0.4% tolerance, significantly superior to the original ±2.2%. Both maintain 100 mA output current and TO-92-3 packaging. LT1431IZ#PBF extends operating temperature to -40°C to 85°C. These parts are suitable for applications requiring higher voltage reference accuracy.

TL1431ACZ and TL1431IZ (STMicroelectronics) provide ±0.25% and ±0.4% tolerance respectively, with TL1431IZ supporting -40°C to 105°C operating range. TL1431ACZ operates at reduced cathode current (600 µA versus 1 mA), beneficial for low-power applications.

Compliance Considerations

TL431CLPE3 carries ROHS3 compliance. Substitute selection should prioritize parts with equivalent or superior RoHS status. TL431CLP is RoHS non-compliant; verify compliance requirements before selection. All active product substitutes listed (TL431IZ, KA431AZBU, LM431AIZ, LT1431 series, TL1431 series, TL431ACLPG) maintain ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can I use TL431CLP as a direct replacement for TL431CLPE3?

A: Yes. TL431CLP provides electrical equivalence with identical voltage output (2.495V to 36V), current rating (100 mA), tolerance (±2.2%), and operating temperature (0°C to 70°C). Both are packaged in TO-92-3. The primary consideration is that TL431CLP is RoHS non-compliant, whereas TL431CLPE3 is ROHS3 compliant. Verify your application's compliance requirements before substitution.

Q: What is the difference between TL431IZ and TL431CLPE3?

A: TL431IZ (STMicroelectronics) is an active product offering equivalent electrical performance with enhanced specifications. Tolerance is ±2.21% (versus ±2.2%), and operating temperature extends to -40°C to 105°C (versus 0°C to 70°C). Both deliver 100 mA output current at 2.495V to 36V. TL431IZ is suitable for applications requiring active product support and extended temperature operation.

Q: Why would I choose LT1431 series over TL431 variants?

A: LT1431 series (Analog Devices Inc.) offers superior voltage reference accuracy with ±0.4% tolerance compared to the original ±2.2%. This enhanced precision is beneficial for applications where voltage regulation accuracy directly impacts system performance. LT1431IZ#PBF additionally supports -40°C to 85°C operating range. All LT1431 variants maintain 100 mA output current and TO-92-3 packaging.

Q: Are all substitute parts available in TO-92-3 packaging?

A: Yes. All substitute parts listed are packaged in TO-92-3 (TO-226-3) through-hole configuration, ensuring mechanical and electrical compatibility with the original TL431CLPE3 footprint.

Q: What does "Obsolete" product status mean for my design?

A: Obsolete status indicates the manufacturer has discontinued production. TL431CLPE3 and TL431CLP are both obsolete. For ongoing production support and long-term availability, select active products such as TL431IZ, KA431AZBU, LM431AIZ, or LT1431 series variants. Active products receive continued manufacturing support and are suitable for new designs.

Q: Can I use a part with lower tolerance (e.g., ±0.4%) in place of ±2.2%?

A: Yes. Lower tolerance values represent improved accuracy and are functionally compatible. Parts with ±0.4%, ±0.25%, or ±1% tolerance can replace the ±2.2% specification. The application will benefit from enhanced voltage reference precision. Verify that other parameters (voltage range, current rating, temperature range, package) meet your requirements.

Q: What is cathode current, and why does it matter?

A: Cathode current is the minimum current required to maintain proper device operation. The original TL431CLPE3 requires 1 mA cathode current. Most substitutes maintain this specification. TL1431ACZ and TL431ACZ operate at reduced cathode current (600 µA), which is beneficial for low-power applications. Ensure your circuit design supplies adequate cathode current for the selected part.

Q: Which substitute offers the widest operating temperature range?

A: TL431IZ and TL1431IZ both support -40°C to 105°C operating range, the widest among available substitutes. These parts are suitable for applications requiring operation across extended temperature environments.

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