TL431ILPRPG Equivalent & Substitute Parts

Part Overview

The TL431ILPRPG is an adjustable shunt voltage reference IC manufactured by onsemi, designed for precision voltage regulation and reference applications. This TO-92-3 packaged component delivers a 2.495V adjustable output with ±2.2% tolerance and supports up to 100 mA output current across a 2.495V to 36V range. The device operates across -40°C to 85°C and maintains ROHS3 compliance. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, design optimization, or application-specific tolerance requirements.

Key Parameters

Parameter	Value
Manufacturer	onsemi
Part Number	TL431ILPRPG
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
Package / Case	TO-226-3, TO-92-3 (TO-226AA) Formed Leads
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the TL431ILPRPG are qualified based on the following electrical and mechanical criteria:

Primary Substitution Criteria:

Reference Type: Shunt (all substitutes maintain shunt topology)
Output Type: Adjustable (all substitutes provide adjustable output)
Voltage Range: 2.495V to 2.5V minimum output, 36V maximum output
Current - Output: 100 mA capability
Current - Cathode: 1 mA (primary criterion; 50 µA variants noted as exception)
Package / Case: TO-92-3 or TO-226-3 (through-hole, formed leads)
Mounting Type: Through Hole

Tolerance Grouping: Substitutes are organized by output voltage tolerance, as this parameter directly affects circuit precision requirements. The TL431ILPRPG operates at ±2.2% tolerance; substitutes with equal or tighter tolerance (±1%, ±0.5%, ±0.4%) are direct replacements. Substitutes with looser tolerance are not qualified.

Temperature Range Consideration: The TL431ILPRPG operates -40°C to 85°C. Substitutes with identical or extended temperature ranges (-40°C to 125°C) are compatible. Substitutes with narrower ranges (-25°C to 85°C) are compatible only for applications not requiring full -40°C operation.

Parameter Comparison

Part Number	Manufacturer	Voltage Output (Min)	Voltage Output (Max)	Current Output	Tolerance	Temp Coefficient	Cathode Current	Operating Temp	Package	Product Status
TL431ILPRPG	onsemi	2.495V	36V	100 mA	±2.2%	50ppm/°C	1 mA	-40°C ~ 85°C	TO-92-3	Active
FAN431AZXA	Fairchild Semiconductor	2.495V	36V	100 mA	±1%	50ppm/°C	1 mA	-25°C ~ 85°C	TO-92-3	Active
KA431AZTA	onsemi	2.495V	36V	100 mA	±1%	50ppm/°C	1 mA	-25°C ~ 85°C	TO-92-3	Active
KA431LZTA	onsemi	2.495V	36V	100 mA	±0.5%	50ppm/°C	1 mA	-25°C ~ 85°C	TO-92-3	Active
LM431BCZX	onsemi	2.495V	36V	100 mA	±1%	50ppm/°C	1 mA	-25°C ~ 85°C	TO-92-3	Active
LM431BCZXA	onsemi	2.495V	36V	100 mA	±1%	50ppm/°C	1 mA	-25°C ~ 85°C	TO-92-3	Active
LM431BIZX	onsemi	2.495V	36V	100 mA	±1%	50ppm/°C	1 mA	-40°C ~ 85°C	TO-92-3	Active
AS431BZTR-E1	Diodes Incorporated	2.5V	36V	100 mA	±1%	20ppm/°C	1 mA	-40°C ~ 125°C	TO-92-3	Active
AS431IAZTR-G1	Diodes Incorporated	2.5V	36V	100 mA	±0.5%	20ppm/°C	50 µA	-40°C ~ 125°C	TO-92-3	Active
AZ431AZ-ATRE1	Diodes Incorporated	2.5V	36V	100 mA	±0.4%	20ppm/°C	1 mA	-40°C ~ 125°C	TO-92-3	Active
AZ431AZ-ATRG1	Diodes Incorporated	2.5V	36V	100 mA	±0.4%	20ppm/°C	1 mA	-40°C ~ 125°C	TO-92-3	Active

Engineering Selection Recommendations

All listed substitute parts maintain Active product status and ROHS3 compliance, ensuring long-term availability and regulatory alignment with the TL431ILPRPG.

Direct Replacement (Full Compatibility): LM431BIZX is the optimal direct replacement, matching the TL431ILPRPG across all critical parameters: ±1% tolerance, 1 mA cathode current, -40°C to 85°C operating range, and TO-92-3 package. Both are onsemi products with identical electrical specifications.

Enhanced Tolerance Substitutes: KA431LZTA and AZ431AZ-ATRE1 provide tighter tolerance (±0.5% and ±0.4% respectively) while maintaining 100 mA output and TO-92-3 packaging. These are suitable for applications requiring improved voltage accuracy. AZ431AZ-ATRE1 extends operating temperature to 125°C and reduces temperature coefficient to 20ppm/°C.

Temperature-Extended Alternatives: AS431BZTR-E1 and AZ431AZ-ATRG1 extend the upper operating temperature to 125°C, beneficial for high-temperature environments. Both maintain 100 mA output and TO-92-3 compatibility.

Cathode Current Exception: AS431IAZTR-G1 operates with 50 µA cathode current instead of 1 mA. This variant is suitable only for applications where reduced cathode current consumption is advantageous and circuit design accommodates the lower current requirement.

Temperature Range Limitation: FAN431AZXA, KA431AZTA, LM431BCZX, and LM431BCZXA operate only to -25°C minimum. These are suitable for applications not requiring full -40°C operation.

Frequently Asked Questions (FAQ)

Q: Can I substitute the TL431ILPRPG with any part from this list? A: Direct substitution is possible only with parts matching the operating temperature range (-40°C to 85°C) and cathode current (1 mA). LM431BIZX is the primary direct replacement. Parts with -25°C minimum temperature or 50 µA cathode current require circuit design verification.

Q: What is the difference between ±2.2%, ±1%, ±0.5%, and ±0.4% tolerance? A: Tolerance specifies the maximum deviation of output voltage from the nominal 2.495V to 2.5V specification. Tighter tolerance (lower percentage) indicates higher voltage accuracy. The TL431ILPRPG operates at ±2.2%; substitutes with ±1%, ±0.5%, or ±0.4% provide equal or superior accuracy and are compatible.

Q: Why do some substitutes have 2.5V output instead of 2.495V? A: Both 2.495V and 2.5V are within the adjustable output range of shunt voltage reference ICs. The difference is negligible for most applications and does not affect substitution compatibility.

Q: What does cathode current mean, and why does AS431IAZTR-G1 have 50 µA instead of 1 mA? A: Cathode current is the minimum current required through the reference IC for stable operation. AS431IAZTR-G1 requires only 50 µA, reducing power consumption. This variant is compatible only if the circuit design provides sufficient cathode current path; applications designed for 1 mA minimum current may not operate reliably with this part.

Q: Can I use a substitute with a higher operating temperature range? A: Yes. Parts rated to -40°C to 125°C (AS431BZTR-E1, AS431IAZTR-G1, AZ431AZ-ATRE1, AZ431AZ-ATRG1) are fully compatible with applications designed for -40°C to 85°C operation. The extended range provides additional design margin.

Q: Are all substitutes in the same TO-92-3 package? A: Yes. All listed substitutes use TO-92-3 (TO-226-3) through-hole package with formed leads, ensuring mechanical and pin compatibility with the TL431ILPRPG.

Q: What is the significance of temperature coefficient (ppm/°C)? A: Temperature coefficient indicates how much the output voltage changes per degree Celsius. The TL431ILPRPG has 50ppm/°C; Diodes Incorporated parts (AS431 and AZ431 series) have 20ppm/°C, indicating superior temperature stability. Lower values are beneficial for precision applications.

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