TL431ILPE3 Equivalent & Substitute Parts

Part Overview

The TL431ILPE3 is a shunt voltage reference IC manufactured by Texas Instruments, designed for adjustable voltage regulation applications. This component provides a fixed output voltage of 2.495V with a maximum rating of 36V and supports output currents up to 100 mA. The device is packaged in TO-92-3 (TO-226-3) through-hole configuration and operates across the temperature range of -40°C to 85°C.

The TL431ILPE3 is classified as obsolete. Due to its discontinued status, equivalent and substitute parts from active manufacturers are necessary for new designs, production continuity, and long-term component availability.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	TL431ILPE3
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	-40°C ~ 85°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 of the TL431ILPE3 is determined by the following critical parameters:

Reference Type: Shunt voltage reference (all substitutes must be shunt type)
Output Type: Adjustable voltage output
Voltage Range: Minimum output 2.495V to 2.5V, maximum 36V
Current Rating: 100 mA output capability
Cathode Current: 1 mA nominal
Package: TO-92-3 through-hole configuration
Temperature Range: Operating range of -40°C to 85°C or broader
Tolerance: ±2.2% or better (lower tolerance values are acceptable)

Substitute parts are grouped into two categories:

Direct Equivalents (Manufacturer Recommended): Parts with identical or near-identical electrical specifications and package configuration, suitable for direct replacement without circuit modification.

Upgraded Alternatives: Parts with improved specifications (lower tolerance, better temperature coefficient, extended temperature range, or higher compliance status) that maintain full backward compatibility while offering enhanced performance characteristics.

Parameter Comparison

Part Number	Manufacturer	Voltage Output (Min)	Voltage Output (Max)	Current Output	Tolerance	Cathode Current	Operating Temp	Package	Product Status	RoHS Status
TL431ILPE3	Texas Instruments	2.495V	36V	100 mA	±2.2%	1 mA	-40°C ~ 85°C	TO-92-3	Obsolete	ROHS3 Compliant
TL431ILP	onsemi	2.495V	36V	100 mA	±2.2%	1 mA	-40°C ~ 85°C	TO-92-3	Obsolete	RoHS non-compliant
TL431IZ	STMicroelectronics	2.495V	36V	100 mA	±2.21%	1 mA	-40°C ~ 105°C	TO-92-3	Active	ROHS3 Compliant
KA431AZBU	Fairchild Semiconductor	2.495V	36V	100 mA	±1%	1 mA	-25°C ~ 85°C	TO-92-3	Active	Not specified
LM431AIZ	Fairchild Semiconductor	2.5V	36V	100 mA	±2%	1 mA	-40°C ~ 85°C	TO-92-3	Active	Not specified
LM431CCZ	onsemi	2.495V	36V	100 mA	±0.5%	1 mA	-25°C ~ 85°C	TO-92-3	Active	ROHS3 Compliant
LT1431CZ#PBF	Analog Devices Inc.	2.5V	36V	100 mA	±0.4%	1 mA	0°C ~ 70°C	TO-92-3	Active	ROHS3 Compliant
LT1431IZ#PBF	Analog Devices Inc.	2.5V	36V	100 mA	±0.4%	1 mA	-40°C ~ 85°C	TO-92-3	Active	ROHS3 Compliant
TL1431ACZ	STMicroelectronics	2.5V	36V	100 mA	±0.25%	600 µA	-20°C ~ 70°C	TO-92-3	Active	ROHS3 Compliant
TL1431IZ	STMicroelectronics	2.5V	36V	100 mA	±0.4%	1 mA	-40°C ~ 105°C	TO-92-3	Active	ROHS3 Compliant
TL431ACLPG	onsemi	2.495V	36V	100 mA	±1%	1 mA	0°C ~ 70°C	TO-92-3	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Obsolete Status Resolution)

The TL431IZ from STMicroelectronics is the primary recommended substitute. It maintains identical electrical specifications (±2.21% tolerance, 2.495V output, 100 mA capability) while offering active product status and ROHS3 compliance. The extended operating temperature range (-40°C to 105°C) provides additional margin for demanding applications.

For Enhanced Performance Requirements

When improved accuracy is required, the LM431CCZ (±0.5% tolerance) and LT1431IZ#PBF (±0.4% tolerance) from active manufacturers provide superior voltage regulation precision while maintaining full backward compatibility. Both are ROHS3 compliant and support the full -40°C to 85°C operating range.

For Highest Precision Applications

The TL1431ACZ offers the tightest tolerance specification (±0.25%) and lowest cathode current (600 µA), suitable for applications requiring maximum accuracy. Note that its operating temperature range is limited to -20°C to 70°C.

Compliance Considerations

All recommended substitutes maintain ROHS3 compliance status. The TL431ILP from onsemi is not RoHS compliant and should be avoided for new designs subject to environmental regulations.

Frequently Asked Questions (FAQ)

Q: Can TL431ILPE3 be directly replaced with TL431IZ?

A: Yes. The TL431IZ from STMicroelectronics is a direct replacement. Both devices share identical shunt reference architecture, output voltage specifications (2.495V), current ratings (100 mA), and TO-92-3 package configuration. The TL431IZ offers active product status and extended temperature range to 105°C.

Q: What is the difference between TL431ILP and TL431IZ?

A: Both are functionally equivalent with ±2.2% tolerance and identical electrical ratings. The primary difference is manufacturer (onsemi vs. STMicroelectronics) and compliance status. TL431ILP is RoHS non-compliant, while TL431IZ is ROHS3 compliant. For new designs, TL431IZ is preferred.

Q: Are KA431AZBU and LM431AIZ suitable replacements?

A: Both are suitable substitutes with active product status. KA431AZBU offers improved tolerance (±1%) but operates only to -25°C. LM431AIZ maintains the full -40°C to 85°C range with ±2% tolerance. Both are electrically compatible and use the same TO-92-3 package.

Q: What is the advantage of LT1431IZ#PBF over TL431IZ?

A: The LT1431IZ#PBF from Analog Devices provides superior voltage regulation accuracy (±0.4% vs. ±2.21%) and lower temperature coefficient (50ppm/°C). It maintains the full -40°C to 85°C operating range and ROHS3 compliance. Selection depends on application accuracy requirements.

Q: Can I use TL1431ACZ as a replacement?

A: TL1431ACZ is electrically compatible but has a narrower operating temperature range (-20°C to 70°C) compared to the original TL431ILPE3 (-40°C to 85°C). Use only in applications where the reduced temperature range is acceptable. It offers the highest precision (±0.25% tolerance).

Q: Why do some substitutes have different output voltage specifications (2.5V vs. 2.495V)?

A: Both 2.495V and 2.5V are within acceptable tolerance ranges for adjustable shunt references. The difference reflects manufacturer specification conventions. In adjustable reference circuits, the actual output voltage is set by external resistor networks, making this minor specification difference inconsequential for most applications.

Q: Are all substitute parts available in the same package?

A: Yes. All listed substitutes use the TO-92-3 through-hole package configuration, ensuring mechanical and electrical compatibility with the original TL431ILPE3 footprint.

Q: Which substitute offers the best long-term availability?

A: The TL431IZ from STMicroelectronics and LM431CCZ from onsemi both have active product status with substantial inventory levels (7,800 and 12,900 units respectively), indicating strong long-term availability and supply chain stability.

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