TL431ACZ Equivalent & Substitute Parts

Part Overview

The TL431ACZ is a shunt voltage reference IC with adjustable output, manufactured by onsemi. This component functions as a precision voltage reference suitable for power management and regulation applications. The part operates with an adjustable output range of 2.495V to 36V, delivering up to 100 mA output current with ±1% tolerance. The TL431ACZ is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement 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	-25°C ~ 85°C (TA)
Mounting Type	Through Hole
Package / Case	TO-226-3, TO-92-3 (TO-226AA)

Substitute Part Grouping Explanation

Substitution for the TL431ACZ is determined by the following critical parameters: reference type (shunt), output type (adjustable), voltage output range (2.495V minimum to 36V maximum), output current capability (100 mA), tolerance specification (±1%), and through-hole mounting in TO-92-3 package. Parts are grouped into three categories based on substitution compatibility:

Direct Parametric Equivalents maintain identical electrical specifications including 2.495V minimum output, 36V maximum output, 100 mA current, and ±1% tolerance. These parts are interchangeable at the circuit level.

Enhanced Tolerance Variants provide tighter tolerance specifications (±0.4% or ±0.2%) while maintaining all other electrical parameters. These parts offer improved accuracy and are suitable for applications requiring higher precision.

Functional Equivalents with Output Voltage Variation maintain the same reference type, output current, and tolerance but operate with a 2.5V minimum output instead of 2.495V. These parts are functionally compatible for most applications where the 5mV difference is not critical.

Parameter Comparison

Part Number	Manufacturer	Voltage Output (Min)	Voltage Output (Max)	Current Output	Tolerance	Cathode Current	Operating Temp	Package	Product Status
TL431ACZ	onsemi	2.495V	36V	100 mA	±1%	1 mA	-25°C ~ 85°C	TO-92-3	Obsolete
TL431BILPG	onsemi	2.495V	36V	100 mA	±0.4%	1 mA	-40°C ~ 85°C	TO-92-3	Active
TL431ILPG	onsemi	2.495V	36V	100 mA	±2.2%	1 mA	-40°C ~ 85°C	TO-92-3	Active
KA431AZBU	Fairchild Semiconductor	2.495V	36V	100 mA	±1%	1 mA	-25°C ~ 85°C	TO-92-3	Active
TL431AIZ	STMicroelectronics	2.495V	36V	100 mA	±1%	700 µA	-40°C ~ 105°C	TO-92-3	Active
TL1431CLP	Texas Instruments	2.5V	36V	100 mA	±0.4%	1 mA	0°C ~ 70°C	TO-92-3	Active
TL1431CLPE3	Texas Instruments	2.5V	36V	100 mA	±0.4%	1 mA	0°C ~ 70°C	TO-92-3	Obsolete
TL1431IZ	STMicroelectronics	2.5V	36V	100 mA	±0.4%	1 mA	-40°C ~ 105°C	TO-92-3	Active
TL431ACZ	Fairchild Semiconductor	2.495V	36V	100 mA	±1%	600 µA	0°C ~ 70°C	TO-92-3	Obsolete
TL431BILP	onsemi	2.495V	36V	100 mA	±0.4%	1 mA	-40°C ~ 85°C	TO-92-3	Obsolete

Engineering Selection Recommendations

For Direct Replacement with Active Product Status: The KA431AZBU (Fairchild Semiconductor) and TL431AIZ (STMicroelectronics) are direct parametric equivalents with identical electrical specifications and active product status. Both maintain ±1% tolerance, 2.495V minimum output, and 100 mA current capability. The TL431AIZ offers extended operating temperature range (-40°C to 105°C) and lower cathode current (700 µA), making it suitable for applications requiring wider temperature operation.

For Enhanced Accuracy Requirements: The TL431BILPG (onsemi) provides ±0.4% tolerance while maintaining all other electrical parameters of the original part. This variant is active and offers improved voltage reference precision for applications where tighter tolerance is beneficial.

For Texas Instruments Ecosystem Integration: The TL1431CLP and TL1431IZ are functionally equivalent with 2.5V minimum output instead of 2.495V. The TL1431IZ (STMicroelectronics) is active with extended temperature range (-40°C to 105°C) and ±0.4% tolerance. The TL1431CLP is active with standard industrial temperature range (0°C to 70°C).

Compliance Considerations: Parts with ROHS3 compliance status include TL431BILPG, TL431ILPG, TL1431CLP, TL1431CLPE3, and TL1431IZ. All listed parts maintain REACH Unaffected status where specified.

Frequently Asked Questions (FAQ)

Q: Can I use TL431BILPG as a direct replacement for TL431ACZ?

A: Yes. The TL431BILPG maintains identical voltage output range (2.495V to 36V), output current (100 mA), and package (TO-92-3). The primary difference is improved tolerance (±0.4% versus ±1%) and extended operating temperature range (-40°C to 85°C versus -25°C to 85°C). This is a direct upgrade with no circuit modifications required.

Q: What is the difference between TL431AIZ and KA431AZBU?

A: Both parts are parametric equivalents with ±1% tolerance and 2.495V to 36V output range. The TL431AIZ (STMicroelectronics) offers extended operating temperature (-40°C to 105°C) and lower cathode current (700 µA). The KA431AZBU (Fairchild Semiconductor) operates from -25°C to 85°C with 1 mA cathode current. Selection depends on temperature range requirements.

Q: Why do some parts have 2.5V minimum output instead of 2.495V?

A: The TL1431 series (TL1431CLP, TL1431CLPE3, TL1431IZ) specifies 2.5V minimum output, a 5mV difference from the TL431ACZ specification of 2.495V. This difference is negligible for most applications. Verify circuit tolerance requirements before substitution.

Q: Are all substitute parts available in the same TO-92-3 package?

A: Yes. All listed substitute parts use TO-92-3 through-hole packaging, ensuring mechanical compatibility. Package dimensions and pin configurations are identical across all variants.

Q: Which substitute part has the best product availability?

A: The TL431AIZ (STMicroelectronics) has the highest inventory level at 389,850 pieces. The TL431ILPG (onsemi) has 5,798 pieces available. Both are active products with reliable supply.

Q: Can I substitute an obsolete part with another obsolete part?

A: Obsolete parts (TL431ACZ, TL431BILP, TL1431CLPE3) should be avoided for new designs. Active alternatives are available: TL431BILPG, TL431ILPG, TL431AIZ, KA431AZBU, TL1431CLP, and TL1431IZ. Use active products for design continuity and long-term supply assurance.

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