TL431AILPRA Equivalent & Substitute Parts

Part Overview

The TL431AILPRA is a shunt voltage reference IC manufactured by onsemi, designed for adjustable voltage regulation applications. This component provides a fixed output voltage of 2.495V with adjustable capability up to 36V, delivering 100 mA output current with ±1% tolerance. The device is classified as obsolete, making equivalent and substitute parts necessary for new designs and production continuity. The TO-92-3 through-hole package supports standard PCB assembly processes.

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	-40°C ~ 85°C (TA)
Mounting Type	Through Hole
Package / Case	TO-226-3, TO-92-3 (TO-226AA) Formed Leads

Substitute Part Grouping Explanation

Substitution eligibility is determined by matching the following critical parameters: Reference Type (Shunt), Output Type (Adjustable), Voltage range (2.495V to 36V), Current output (100 mA), Tolerance (±1% or better), and Package (TO-92-3). Parts are grouped into three categories:

Direct Substitutes maintain identical electrical specifications and packaging, differing only in product status or RoHS compliance.

Similar Substitutes match all critical electrical parameters but may have minor variations in operating temperature range or cathode current specifications that do not affect functional compatibility.

Parametric Equivalents provide identical electrical performance with extended temperature ranges or improved tolerance specifications, offering enhanced reliability for demanding applications.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage Output (Min/Max)	Current Output	Tolerance	Operating Temperature	Current - Cathode	RoHS Status
TL431AILPRA	onsemi	Obsolete	2.495V / 36V	100 mA	±1%	-40°C ~ 85°C	1 mA	RoHS non-compliant
TL431AILPRAG	onsemi	Active	2.495V / 36V	100 mA	±1%	-40°C ~ 85°C	1 mA	ROHS3 Compliant
FAN431AZXA	Fairchild Semiconductor	Active	2.495V / 36V	100 mA	±1%	-25°C ~ 85°C	1 mA	Not specified
KA431AZTA	onsemi	Active	2.495V / 36V	100 mA	±1%	-25°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
LM431BCZX	onsemi	Active	2.495V / 36V	100 mA	±1%	-25°C ~ 85°C	1 mA	ROHS3 Compliant
LM431BCZXA	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
TL431AILPRPG	onsemi	Obsolete	2.495V / 36V	100 mA	±1%	-40°C ~ 85°C	1 mA	ROHS3 Compliant
TL431ACLPR	Texas Instruments	Active	2.495V / 36V	100 mA	±1%	0°C ~ 70°C	600 µA	ROHS3 Compliant
TL431AILPM	Texas Instruments	Active	2.495V / 36V	100 mA	±1%	-40°C ~ 85°C	700 µA	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: TL431AILPRAG

The TL431AILPRAG is the direct substitute for the obsolete TL431AILPRA. Manufactured by onsemi, it maintains identical electrical specifications and TO-92-3 packaging while offering Active product status and ROHS3 compliance. This part provides the most straightforward replacement path with no design modifications required.

Extended Temperature Range Alternative: LM431BIZX

The LM431BIZX from onsemi provides identical electrical performance to the original part, including the full -40°C to 85°C operating temperature range and 1 mA cathode current specification. This part is Active and ROHS3 compliant, making it suitable for applications requiring extended temperature operation.

Improved Tolerance Option: KA431LZTA

The KA431LZTA offers enhanced tolerance specification of ±0.5% compared to the original ±1%, providing superior voltage regulation accuracy. This part is Active and ROHS3 compliant, though it operates over -25°C to 85°C, which is acceptable for most standard industrial applications.

Cross-Manufacturer Option: TL431AILPM

The TL431AILPM from Texas Instruments maintains the full -40°C to 85°C operating temperature range and ±1% tolerance. This part is Active and ROHS3 compliant, offering supply chain diversification. Note the cathode current specification of 700 µA differs from the original 1 mA specification.

Limited Temperature Range: TL431ACLPR

The TL431ACLPR from Texas Instruments is suitable only for applications operating within 0°C to 70°C. This narrower temperature range and reduced cathode current (600 µA) make it appropriate for controlled environment applications only.

Frequently Asked Questions (FAQ)

Q: Can I use KA431LZTA as a direct replacement for TL431AILPRA?

A: Yes. The KA431LZTA matches all critical electrical parameters: 2.495V to 36V output range, 100 mA output current, ±0.5% tolerance (better than the original ±1%), and TO-92-3 packaging. The operating temperature range is -25°C to 85°C, which covers most standard applications. The improved tolerance provides enhanced performance.

Q: What is the difference between TL431AILPRAG and LM431BIZX?

A: Both parts are functionally equivalent with identical voltage output, current rating, and tolerance. TL431AILPRAG uses the TL431 base product designation, while LM431BIZX uses the LM431 designation. Both are manufactured by onsemi, are Active, and ROHS3 compliant. Selection depends on availability and supply chain preferences.

Q: Why does TL431ACLPR have a narrower operating temperature range?

A: The TL431ACLPR from Texas Instruments is specified for 0°C to 70°C operation. This narrower range is a design specification from the manufacturer. For applications requiring -40°C to 85°C operation, use TL431AILPRAG, LM431BIZX, or TL431AILPM instead.

Q: Is the cathode current difference between parts significant?

A: The original TL431AILPRA specifies 1 mA cathode current. Substitute parts maintain this specification except TL431ACLPR (600 µA) and TL431AILPM (700 µA). For most applications, these variations are not critical. Verify cathode current requirements in your specific circuit design before selecting an alternative.

Q: Are all substitute parts RoHS compliant?

A: The original TL431AILPRA is RoHS non-compliant. All recommended substitutes are ROHS3 compliant, meeting current environmental regulations. This compliance improvement is a benefit of transitioning to active production parts.

Q: Can I mix different substitute parts in the same production run?

A: All listed substitutes are electrically equivalent within the specified parameters and use identical TO-92-3 packaging. However, for consistency and traceability, it is recommended to standardize on a single part number per production batch.

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