TL431ACLPRE Equivalent & Substitute Parts

Part Overview

The TL431ACLPRE is a shunt voltage reference IC manufactured by onsemi, designed for adjustable voltage regulation applications. This component features a 2.495V to 36V output range with ±1% tolerance and 100 mA output capability in a TO-92-3 package. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Type	Adjustable
Voltage - Output (Min/Fixed)	2.495V
Voltage - Output (Max)	36V
Current - Output	100 mA
Tolerance	±1%
Temperature Coefficient	50ppm/°C Typical
Current - Cathode	1 mA
Operating Temperature	0°C ~ 70°C
Package / Case	TO-226-3, TO-92-3 (TO-226AA) Formed Leads
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitute parts are classified based on electrical parameter compatibility with the TL431ACLPRE. The critical parameters determining substitution eligibility are:

Reference Type: Shunt
Output Type: Adjustable
Voltage Output Range: 2.495V to 36V (minimum)
Current Output: 100 mA
Tolerance: ±1% or better
Package: TO-92-3 compatible
Mounting: Through Hole

Parts are grouped into four categories:

Upgrade Substitutes maintain all electrical specifications while offering improved product status (Active vs. Obsolete) and enhanced temperature operating ranges or compliance certifications.

Parametric Equivalents match all core electrical parameters but may differ in packaging designation or compliance status.

Direct Equivalents provide identical electrical performance from alternative manufacturers with active product status.

Similar Parts meet the core functional requirements but with improved tolerance (±0.5% vs. ±1%) or enhanced temperature coefficients, suitable for applications requiring higher precision.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage Output (Min/Max)	Current Output	Tolerance	Operating Temp	Current - Cathode	RoHS Status
TL431ACLPRE	onsemi	Obsolete	2.495V / 36V	100 mA	±1%	0°C ~ 70°C	1 mA	Non-compliant
FAN431AZXA	Fairchild Semiconductor	Active	2.495V / 36V	100 mA	±1%	-25°C ~ 85°C	1 mA	Not specified
LM431BCZX	onsemi	Active	2.495V / 36V	100 mA	±1%	-25°C ~ 85°C	1 mA	ROHS3 Compliant
LM431BIZX	onsemi	Active	2.495V / 36V	100 mA	±1%	-40°C ~ 85°C	1 mA	ROHS3 Compliant
KA431LZTA	onsemi	Active	2.495V / 36V	100 mA	±0.5%	-25°C ~ 85°C	1 mA	ROHS3 Compliant
TL431ACLPRAG	onsemi	Active	2.495V / 36V	100 mA	±1%	0°C ~ 70°C	1 mA	ROHS3 Compliant
TL431ACLPR	Texas Instruments	Active	2.495V / 36V	100 mA	±1%	0°C ~ 70°C	600 µA	ROHS3 Compliant
TL431AIZ-AP	STMicroelectronics	Active	2.495V / 36V	100 mA	±1%	-40°C ~ 105°C	700 µA	ROHS3 Compliant
TL431AIZT	STMicroelectronics	Active	2.495V / 36V	100 mA	±1%	-40°C ~ 105°C	700 µA	ROHS3 Compliant
AS431AZTR-E1	Diodes Incorporated	Active	2.5V / 36V	100 mA	±0.5%	-40°C ~ 125°C	1 mA	ROHS3 Compliant
AS431AZTR-G1	Diodes Incorporated	Active	2.5V / 36V	100 mA	±0.5%	-40°C ~ 125°C	1 mA	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): TL431ACLPRAG (onsemi) and TL431ACLPR (Texas Instruments) provide identical electrical performance to the TL431ACLPRE with active product status and ROHS3 compliance. Both maintain the 0°C to 70°C operating temperature range and ±1% tolerance. TL431ACLPR offers higher inventory availability (125,200 units).

For Extended Temperature Range Applications: LM431BIZX (onsemi) extends the operating range to -40°C to 85°C while maintaining all core electrical specifications and ROHS3 compliance. TL431AIZ-AP and TL431AIZT (STMicroelectronics) further extend to -40°C to 105°C, suitable for industrial and automotive environments.

For Improved Tolerance Requirements: KA431LZTA (onsemi) and AS431AZTR-E1/AS431AZTR-G1 (Diodes Incorporated) provide ±0.5% tolerance, offering superior voltage regulation accuracy. The Diodes Incorporated variants additionally support -40°C to 125°C operation.

For Broad Compatibility: LM431BCZX (onsemi) balances active product status, ROHS3 compliance, and extended temperature range (-25°C to 85°C) with standard ±1% tolerance and 1 mA cathode current matching the original specification.

All substitute parts maintain TO-92-3 package compatibility and 100 mA output current capability.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with ±0.5% tolerance in place of the ±1% TL431ACLPRE? A: Yes. Parts with ±0.5% tolerance (KA431LZTA, AS431AZTR-E1, AS431AZTR-G1) are electrically compatible and provide superior accuracy. They meet or exceed the original specification requirements.

Q: What is the difference between the cathode current specifications (1 mA vs. 600 µA vs. 700 µA)? A: Cathode current represents the minimum operating current required for proper device function. Lower cathode current (600 µA in TL431ACLPR) reduces power consumption. All values are within acceptable operating ranges for standard applications. Verify circuit design requirements before selection.

Q: Are all substitute parts RoHS compliant? A: The original TL431ACLPRE is RoHS non-compliant. Most active substitutes (LM431BCZX, LM431BIZX, KA431LZTA, TL431ACLPRAG, TL431ACLPR, TL431AIZ-AP, TL431AIZT, AS431AZTR-E1, AS431AZTR-G1) are ROHS3 compliant. FAN431AZXA compliance status is not specified in available data.

Q: Which substitute offers the widest operating temperature range? A: AS431AZTR-E1 and AS431AZTR-G1 (Diodes Incorporated) support -40°C to 125°C operation, the broadest range among available substitutes. These are suitable for extreme environment applications.

Q: Is the TO-92-3 package compatible across all substitute parts? A: Yes. All listed substitutes use TO-226-3 or TO-92-3 (TO-226AA) formed leads packages, maintaining mechanical and electrical compatibility with the original TL431ACLPRE footprint.

Q: Can I substitute the TL431ACLPRE with a part from a different manufacturer? A: Yes. FAN431AZXA (Fairchild Semiconductor), TL431ACLPR (Texas Instruments), TL431AIZ-AP/TL431AIZT (STMicroelectronics), and AS431AZTR-E1/AS431AZTR-G1 (Diodes Incorporated) are all functionally equivalent with identical core electrical specifications and TO-92-3 package compatibility.

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