TL431ILPRE3 Equivalent & Substitute Parts

Part Overview

The TL431ILPRE3 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. Due to its obsolete status, identifying functionally equivalent active alternatives is essential for design continuity and procurement reliability.

Key Parameters

Parameter	Value
Manufacturer Part Number	TL431ILPRE3
Manufacturer	Texas Instruments
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 (TA)
Package / Case	TO-226-3, TO-92-3 (TO-226AA) Formed Leads
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the TL431ILPRE3 is determined by the following critical parameters:

Primary Compatibility Criteria:

Reference Type: Shunt
Output Type: Adjustable
Voltage Range: Minimum 2.495V to 36V output capability
Current Output: 100 mA
Package: TO-92-3 (TO-226AA) through-hole configuration
Mounting Type: Through Hole

Secondary Compatibility Criteria:

Tolerance: ±2.2% or better (lower tolerance values are acceptable)
Cathode Current: 1 mA nominal
Operating Temperature Range: Must support -40°C minimum and 85°C minimum upper limit
RoHS3 Compliance

Substitute parts are grouped into two categories: direct replacements maintaining identical specifications (MFR Recommended), and upgraded alternatives offering improved performance characteristics such as tighter tolerance, extended temperature range, or enhanced reliability while maintaining functional compatibility.

Parameter Comparison

Parameter	TL431ILPRE3	TL431ILPR	TL431IZ-AP	TL431IZT	AS431AZTR-E1	AS431AZTR-G1	AS431BZTR-E1	AS431BZTR-G1	AS431IAZTR-G1	AZ431AZ-ATRE1	AZ431AZ-ATRG1
Manufacturer	Texas Instruments	Texas Instruments	STMicroelectronics	STMicroelectronics	Diodes Inc.	Diodes Inc.	Diodes Inc.	Diodes Inc.	Diodes Inc.	Diodes Inc.	Diodes Inc.
Reference Type	Shunt	Shunt	Shunt	Shunt	Shunt	Shunt	Shunt	Shunt	Shunt	Shunt	Shunt
Output Type	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable
Voltage - Output (Min)	2.495V	2.495V	2.495V	2.495V	2.5V	2.5V	2.5V	2.5V	2.5V	2.5V	2.5V
Voltage - Output (Max)	36V	36V	36V	36V	36V	36V	36V	36V	36V	36V	36V
Current - Output	100 mA	100 mA	100 mA	100 mA	100 mA	100 mA	100 mA	100 mA	100 mA	100 mA	100 mA
Tolerance	±2.2%	±2.2%	±2.21%	±2.21%	±0.5%	±0.5%	±1%	±1%	±0.5%	±0.4%	±0.4%
Current - Cathode	1 mA	1 mA	1 mA	1 mA	1 mA	1 mA	1 mA	1 mA	50 µA	1 mA	1 mA
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 105°C	-40°C ~ 105°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Package / Case	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-2, TO-92-2	TO-226-2, TO-92-2	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (Identical Specifications): TL431ILPR is the active equivalent from Texas Instruments, maintaining identical electrical specifications and temperature range as the TL431ILPRE3. This part is recommended as the primary replacement for existing designs requiring no circuit modifications.

Upgraded Alternatives (Enhanced Performance): Parts from STMicroelectronics (TL431IZ-AP, TL431IZT) and Diodes Incorporated (AS431 and AZ431 series) offer improved tolerance specifications and extended operating temperature ranges. These alternatives provide superior performance characteristics while maintaining functional compatibility. The AZ431AZ-ATRE1 and AZ431AZ-ATRG1 deliver the tightest tolerance at ±0.4% with extended temperature operation to 125°C.

Cathode Current Consideration: AS431IAZTR-G1 operates with reduced cathode current (50 µA versus 1 mA), which may reduce power dissipation in applications with limited bias current availability.

Package Compatibility: TL431IZ-AP and TL431IZT use TO-92-2 (TO-226AC) packaging, which differs from the TO-92-3 (TO-226AA) of the original part. Verify PCB footprint compatibility before selection.

All substitute parts maintain ROHS3 compliance and are currently in active production status, ensuring long-term availability and supply chain reliability.

Frequently Asked Questions (FAQ)

Q: Can I use AS431AZTR-E1 as a direct replacement for TL431ILPRE3? A: Yes. Both parts share identical output voltage range (2.495V to 36V minimum), 100 mA output current, 1 mA cathode current, and TO-92-3 package configuration. AS431AZTR-E1 offers improved tolerance (±0.5% versus ±2.2%) and extended temperature range (-40°C to 125°C versus -40°C to 85°C), making it a compatible upgrade.

Q: What is the difference between AS431AZTR-E1 and AS431AZTR-G1? A: Both parts are electrically identical with ±0.5% tolerance and identical temperature range. The difference lies in manufacturing traceability and qualification batches, indicated by the E1 and G1 suffixes. Either part is functionally interchangeable.

Q: Why do TL431IZ-AP and TL431IZT show TO-92-2 packaging instead of TO-92-3? A: These STMicroelectronics parts use a 2-pin TO-92 variant (TO-226AC) rather than the 3-pin TO-92-3 (TO-226AA) configuration. Verify your PCB footprint accommodates this package variant before selection.

Q: Is AS431IAZTR-G1 suitable for my application if cathode current is critical? A: AS431IAZTR-G1 operates with 50 µA cathode current compared to 1 mA in other alternatives. This reduced current may be advantageous in low-power bias circuits but requires verification that your reference bias network is designed for this specification.

Q: Do all substitute parts meet RoHS3 compliance? A: Yes. All listed substitute parts are ROHS3 compliant, matching the compliance status of the original TL431ILPRE3.

Q: What tolerance should I select for my design? A: Tolerance selection depends on your voltage regulation accuracy requirements. The original TL431ILPRE3 specifies ±2.2%. Tighter tolerance alternatives (±0.5% to ±0.4%) provide improved accuracy but may have different pricing and availability. Verify your circuit design tolerances before upgrading to a tighter specification part.

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