TL431ILPRA Equivalent & Substitute Parts

Part Overview

The TL431ILPRA is a shunt voltage reference IC manufactured by onsemi, designed for adjustable voltage regulation applications. This component features a 2.495V adjustable output with ±2.2% tolerance and supports output currents up to 100 mA across a 36V range. The part is mounted in a TO-92-3 package with through-hole leads.

The TL431ILPRA carries an obsolete product status. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and access components with improved specifications or active manufacturing status.

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	±2.2%
Temperature Coefficient	50ppm/°C Typical
Current - Cathode	1 mA
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Through Hole
Package / Case	TO-226-3, TO-92-3 (TO-226AA) Formed Leads
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict alignment with the following core parameters: reference type (shunt), output type (adjustable), voltage output range (2.495V minimum, 36V maximum), current output (100 mA), package type (TO-92-3), and mounting method (through hole).

Substitute parts are grouped into three categories:

Direct Manufacturer Equivalents maintain identical electrical specifications (2.495V output, ±2.2% tolerance, 100 mA current, 1 mA cathode current) with matching or improved product status and compliance certifications.

Similar Tolerance Variants provide the same voltage and current ratings but with improved tolerance specifications (±1% or ±0.5%), allowing for higher precision applications while maintaining full electrical compatibility.

Parametric Equivalents match all critical electrical parameters but may differ in operating temperature range, cathode current specifications, or manufacturing status, requiring application-level verification.

Parameter Comparison

Part Number	Manufacturer	Tolerance	Output Voltage	Output Current	Cathode Current	Operating Temperature	Product Status	RoHS Status
TL431ILPRA	onsemi	±2.2%	2.495V - 36V	100 mA	1 mA	-40°C ~ 85°C	Obsolete	Non-compliant
TL431ILPRAG	onsemi	±2.2%	2.495V - 36V	100 mA	1 mA	-40°C ~ 85°C	Active	ROHS3 Compliant
TL431ILPRPG	onsemi	±2.2%	2.495V - 36V	100 mA	1 mA	-40°C ~ 85°C	Active	ROHS3 Compliant
TL431ILPR	Texas Instruments	±2.2%	2.495V - 36V	100 mA	1 mA	-40°C ~ 85°C	Active	ROHS3 Compliant
TL431CLPR	Texas Instruments	±2.2%	2.495V - 36V	100 mA	1 mA	0°C ~ 70°C	Active	ROHS3 Compliant
TL431ACLPR	Texas Instruments	±1%	2.495V - 36V	100 mA	600 µA	0°C ~ 70°C	Active	ROHS3 Compliant
KA431AZTA	onsemi	±1%	2.495V - 36V	100 mA	1 mA	-25°C ~ 85°C	Active	ROHS3 Compliant
KA431LZTA	onsemi	±0.5%	2.495V - 36V	100 mA	1 mA	-25°C ~ 85°C	Active	ROHS3 Compliant
FAN431AZXA	Fairchild Semiconductor	±1%	2.495V - 36V	100 mA	1 mA	-25°C ~ 85°C	Active	Not specified
AS431AZTR-E1	Diodes Incorporated	±0.5%	2.5V - 36V	100 mA	1 mA	-40°C ~ 125°C	Active	ROHS3 Compliant
AS431AZTR-G1	Diodes Incorporated	±0.5%	2.5V - 36V	100 mA	1 mA	-40°C ~ 125°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: TL431ILPRAG or TL431ILPRPG

Both parts are manufactured by onsemi with identical electrical specifications to the TL431ILPRA. These components maintain the ±2.2% tolerance, 100 mA output current, and -40°C to 85°C operating range. Both carry active product status and ROHS3 compliance, providing direct functional replacement with improved supply chain availability and regulatory compliance.

Alternative for Extended Temperature Range: TL431ILPR (Texas Instruments)

This part maintains all critical electrical parameters and operating temperature range (-40°C to 85°C) with active product status and ROHS3 compliance. It provides cross-manufacturer compatibility while preserving thermal performance specifications.

For Improved Tolerance Requirements: KA431AZTA or KA431LZTA

When applications require tighter voltage reference accuracy, the KA431AZTA (±1% tolerance) and KA431LZTA (±0.5% tolerance) offer enhanced precision while maintaining 100 mA output current and TO-92-3 packaging. Both are manufactured by onsemi with active status and ROHS3 compliance. Operating temperature range is -25°C to 85°C.

For Extended Temperature Performance: AS431AZTR-E1 or AS431AZTR-G1

Diodes Incorporated AS431 series parts provide ±0.5% tolerance with extended operating range (-40°C to 125°C). Output voltage is specified at 2.5V minimum (versus 2.495V), which remains within acceptable tolerance margins for most applications. Both parts carry active status and ROHS3 compliance.

Not Recommended: TL431CLPR or TL431ACLPR (Texas Instruments)

These parts feature reduced operating temperature range (0°C to 70°C), which is narrower than the original TL431ILPRA specification (-40°C to 85°C). Selection should be limited to applications with restricted thermal requirements.

Frequently Asked Questions (FAQ)

Q: Can TL431ILPRAG directly replace TL431ILPRA without circuit modifications?

A: Yes. TL431ILPRAG maintains identical electrical specifications: ±2.2% tolerance, 2.495V to 36V output range, 100 mA output current, 1 mA cathode current, and -40°C to 85°C operating temperature. The TO-92-3 package and through-hole mounting are identical. No circuit modifications are required.

Q: What is the difference between TL431ILPR (Texas Instruments) and TL431ILPRAG (onsemi)?

A: Both parts are electrically equivalent with identical tolerance (±2.2%), voltage range (2.495V to 36V), current ratings (100 mA output, 1 mA cathode), and operating temperature (-40°C to 85°C). The primary difference is manufacturer. Both carry active product status and ROHS3 compliance. Selection may be based on supply availability or preferred supplier qualification.

Q: Why would I choose KA431AZTA over TL431ILPRAG?

A: The KA431AZTA offers improved voltage reference accuracy at ±1% tolerance compared to ±2.2% for the TL431ILPRAG. All other electrical parameters remain identical. Selection depends on application precision requirements. The KA431AZTA operating temperature range is -25°C to 85°C, which is narrower at the lower end.

Q: Are AS431AZTR-E1 and AS431AZTR-G1 interchangeable?

A: Yes. Both Diodes Incorporated parts are electrically identical with ±0.5% tolerance, 2.5V to 36V output range, 100 mA output current, and -40°C to 125°C operating temperature. The primary difference is packaging designation. Both are suitable for direct substitution in applications requiring high precision voltage reference.

Q: What does the output voltage difference between 2.495V (TL431) and 2.5V (AS431) mean for compatibility?

A: The 5 mV difference falls within the tolerance specifications of both parts. The TL431ILPRA tolerance of ±2.2% allows for output variation of approximately ±55 mV around 2.495V. The AS431 tolerance of ±0.5% allows for approximately ±12.5 mV around 2.5V. Both specifications overlap sufficiently for functional equivalence in standard voltage reference applications. Application-specific verification is required for precision circuits with tight tolerance requirements.

Q: Can I use TL431CLPR in a design originally specified for TL431ILPRA?

A: TL431CLPR is not recommended as a direct replacement. While electrical specifications are identical (±2.2% tolerance, 100 mA output current), the operating temperature range is restricted to 0°C to 70°C compared to -40°C to 85°C for the TL431ILPRA. Use only if your application operates exclusively within the 0°C to 70°C range.

Q: What is the significance of cathode current specifications (1 mA versus 600 µA)?

A: Cathode current represents the minimum operating current required for proper voltage reference operation. The TL431ILPRA requires 1 mA minimum cathode current. The TL431ACLPR requires only 600 µA. Lower cathode current requirements allow for lower power consumption in current-limited applications. Both specifications are compatible with standard reference circuit designs; however, circuit biasing must accommodate the specified minimum current.

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