TL431AILPRM Equivalent & Substitute Parts

Part Overview

The TL431AILPRM is a shunt voltage reference IC manufactured by onsemi, designed for adjustable voltage regulation applications. This component provides a 2.495V to 36V adjustable output with ±1% tolerance and 100 mA output capability in a TO-92-3 package. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts must maintain electrical compatibility across output voltage range, current capacity, tolerance specifications, and mechanical form factor.

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
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitute parts are classified based on electrical and mechanical compatibility with the TL431AILPRM. The critical parameters determining substitutability are: output voltage range (2.495V to 36V minimum), output current (100 mA minimum), tolerance (±1% or better), operating temperature range (-40°C to 85°C minimum), and package form factor (TO-92-3 through-hole). Parts are grouped as follows:

Direct Manufacturer Equivalents: Parts with identical electrical specifications and active product status, offering improved availability and compliance.

Parametric Equivalents: Parts meeting all electrical requirements but with different product status or minor packaging variations.

Similar Parts: Components with equivalent or superior electrical performance but with parameter variations (tolerance, temperature coefficient, operating temperature range) that require design verification.

Upgrade Options: Parts with extended operating temperature ranges or improved compliance status, suitable for applications requiring enhanced thermal performance.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage Output (Min/Max)	Current Output	Tolerance	Cathode Current	Operating Temp	RoHS Status	Inventory
TL431AILPRM	onsemi	Obsolete	2.495V / 36V	100 mA	±1%	1 mA	-40°C ~ 85°C	Non-compliant	668 Pcs
LM431BIZX	onsemi	Active	2.495V / 36V	100 mA	±1%	1 mA	-40°C ~ 85°C	ROHS3 Compliant	10400 Pcs
TL431AILPG	onsemi	Obsolete	2.495V / 36V	100 mA	±1%	1 mA	-40°C ~ 85°C	ROHS3 Compliant	12900 Pcs
TL431AILPM	Texas Instruments	Active	2.495V / 36V	100 mA	±1%	700 µA	-40°C ~ 85°C	ROHS3 Compliant	30177 Pcs
TL431AILPR	Texas Instruments	Active	2.495V / 36V	100 mA	±1%	700 µA	-40°C ~ 85°C	ROHS3 Compliant	61100 Pcs
TL431AILPME3	Texas Instruments	Obsolete	2.495V / 36V	100 mA	±1%	700 µA	-40°C ~ 85°C	ROHS3 Compliant	8973 Pcs
TL431AILPRE3	Texas Instruments	Obsolete	2.495V / 36V	100 mA	±1%	700 µA	-40°C ~ 85°C	ROHS3 Compliant	2900 Pcs
TL431AIZ-AP	STMicroelectronics	Active	2.495V / 36V	100 mA	±1%	700 µA	-40°C ~ 105°C	ROHS3 Compliant	3256 Pcs
TL431AIZT	STMicroelectronics	Active	2.495V / 36V	100 mA	±1%	700 µA	-40°C ~ 105°C	ROHS3 Compliant	2300 Pcs
FAN431AZXA	Fairchild Semiconductor	Active	2.495V / 36V	100 mA	±1%	1 mA	-25°C ~ 85°C	Not specified	6912 Pcs
AS431AZTR-E1	Diodes Incorporated	Active	2.5V / 36V	100 mA	±0.5%	1 mA	-40°C ~ 125°C	ROHS3 Compliant	117200 Pcs

Engineering Selection Recommendations

For RoHS3 Compliance Requirement: Select LM431BIZX (onsemi, active status, 10400 Pcs available) or TL431AILPR (Texas Instruments, active status, 61100 Pcs available). Both maintain identical electrical specifications to the original part while meeting current compliance standards.

For Extended Temperature Operation: TL431AIZ-AP and TL431AIZT (STMicroelectronics) extend the upper operating temperature to 105°C, suitable for applications requiring thermal margin beyond the standard -40°C to 85°C range.

For Maximum Availability: TL431AILPR (Texas Instruments) offers the highest inventory level at 61100 pieces with active product status and ROHS3 compliance.

For Superior Tolerance Performance: AS431AZTR-E1 (Diodes Incorporated) provides ±0.5% tolerance versus the ±1% specification, with extended operating temperature to 125°C and highest inventory availability at 117200 pieces. This part requires design verification due to tolerance and temperature coefficient differences.

For Cathode Current Consideration: LM431BIZX and FAN431AZXA maintain the original 1 mA cathode current specification. Texas Instruments and STMicroelectronics variants specify 700 µA cathode current, which may affect bias network design in applications with tight current budgets.

Frequently Asked Questions (FAQ)

Q: Can TL431AILPR directly replace TL431AILPRM without circuit modification?

A: Yes. TL431AILPR maintains identical output voltage range (2.495V to 36V), output current (100 mA), and tolerance (±1%). The primary difference is cathode current specification (700 µA versus 1 mA), which typically does not require circuit redesign in standard applications. Verify bias network current sourcing capability in your specific design.

Q: What is the difference between onsemi LM431BIZX and Texas Instruments TL431AILPR?

A: Both parts are electrically equivalent with identical voltage, current, and tolerance specifications. LM431BIZX maintains 1 mA cathode current matching the original part. TL431AILPR specifies 700 µA cathode current. Texas Instruments offers significantly higher inventory (61100 Pcs). Selection depends on cathode current requirements and supplier preference.

Q: Is AS431AZTR-E1 a suitable replacement despite ±0.5% tolerance versus ±1%?

A: AS431AZTR-E1 exceeds the tolerance requirement with ±0.5% specification and extends operating temperature to 125°C. The tighter tolerance and improved temperature coefficient (20ppm/°C) represent performance enhancements. Design verification is required to confirm compatibility with existing bias networks and reference accuracy requirements.

Q: Why do some substitutes specify different cathode current values?

A: Cathode current specification reflects the minimum current required to maintain regulation. Texas Instruments and STMicroelectronics variants specify 700 µA, while onsemi and Fairchild variants specify 1 mA. This affects bias resistor selection in the external circuit. Verify your design's current sourcing capability against the selected part's cathode current requirement.

Q: What is the impact of operating temperature range differences?

A: The original part specifies -40°C to 85°C. STMicroelectronics variants (TL431AIZ-AP, TL431AIZT) extend to 105°C, and AS431AZTR-E1 extends to 125°C. FAN431AZXA operates to 85°C but with reduced lower temperature limit (-25°C). Select based on your application's thermal environment and required operating margins.

Q: Are all substitute parts RoHS3 compliant?

A: Most active-status substitutes are ROHS3 compliant. The original TL431AILPRM is RoHS non-compliant. For new designs or compliance-required applications, select from LM431BIZX, TL431AILPR, TL431AILPM, TL431AIZ-AP, TL431AIZT, or AS431AZTR-E1.

Q: Can I use parts with different manufacturers interchangeably?

A: Yes, provided electrical specifications match your design requirements. All listed substitutes maintain the core TL431 reference architecture with identical output voltage range, current capacity, and tolerance. Verify cathode current and temperature coefficient specifications against your bias network design before implementation.

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