TL431BCLPREG Equivalent & Substitute Parts

Part Overview

The TL431BCLPREG is a shunt voltage reference IC manufactured by onsemi, designed for precision adjustable voltage regulation applications. This component provides an adjustable output voltage range from 2.495V to 36V with ±0.4% tolerance and supports output currents up to 100 mA in a TO-92-3 through-hole package. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	TL431BCLPREG
Manufacturer	onsemi
Reference Type	Shunt
Output Type	Adjustable
Voltage - Output (Min/Fixed)	2.495V
Voltage - Output (Max)	36V
Current - Output	100 mA
Tolerance	±0.4%
Temperature Coefficient	50ppm/°C Typical
Current - Cathode	1 mA
Operating Temperature	0°C ~ 70°C (TA)
Mounting Type	Through Hole
Package / Case	TO-226-3, TO-92-3 (TO-226AA) Formed Leads
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the TL431BCLPREG is determined by the following critical parameters: reference type (shunt), output type (adjustable), output voltage range (2.495V to 36V minimum), output current capability (100 mA), tolerance specification (±0.4% or better), package type (TO-92-3), and through-hole mounting. Parts are grouped into three categories based on substitution compatibility:

Parametric Equivalents maintain identical electrical specifications including ±0.4% tolerance and 0°C to 70°C operating temperature range, differing only in product status or packaging format.

Similar Substitutes provide functionally equivalent performance with relaxed tolerance specifications (±0.5% to ±1%) and extended operating temperature ranges (-25°C to 85°C or -40°C to 125°C), suitable for applications where tighter tolerance is not required.

Direct Equivalents are alternative manufacturer versions with matching or superior electrical characteristics and active product status.

Parameter Comparison

Part Number	Manufacturer	Voltage Output (Min)	Voltage Output (Max)	Current Output	Tolerance	Operating Temp	Product Status	Package
TL431BCLPREG	onsemi	2.495V	36V	100 mA	±0.4%	0°C ~ 70°C	Obsolete	TO-92-3
TL431BCLPRAG	onsemi	2.495V	36V	100 mA	±0.4%	0°C ~ 70°C	Active	TO-92-3
TL431BCLPRMG	onsemi	2.495V	36V	100 mA	±0.4%	0°C ~ 70°C	Obsolete	TO-92-3
TL1431CLPME3	Texas Instruments	2.5V	36V	100 mA	±0.4%	0°C ~ 70°C	Active	TO-92-3
TL431BCLPR	Texas Instruments	2.495V	36V	100 mA	±0.5%	0°C ~ 70°C	Active	TO-92-3
KA431LZTA	onsemi	2.495V	36V	100 mA	±0.5%	-25°C ~ 85°C	Active	TO-92-3
KA431AZTA	onsemi	2.495V	36V	100 mA	±1%	-25°C ~ 85°C	Active	TO-92-3
FAN431AZXA	Fairchild Semiconductor	2.495V	36V	100 mA	±1%	-25°C ~ 85°C	Active	TO-92-3
AS431AZTR-E1	Diodes Incorporated	2.5V	36V	100 mA	±0.5%	-40°C ~ 125°C	Active	TO-92
AS431AZTR-G1	Diodes Incorporated	2.5V	36V	100 mA	±0.5%	-40°C ~ 125°C	Active	TO-92
AS431BZTR-E1	Diodes Incorporated	2.5V	36V	100 mA	±1%	-40°C ~ 125°C	Active	TO-92

Engineering Selection Recommendations

Primary Recommendation: TL431BCLPRAG (onsemi)

TL431BCLPRAG is the direct parametric equivalent with identical electrical specifications (±0.4% tolerance, 0°C to 70°C operating range) and active product status. This part maintains full compatibility with the obsolete TL431BCLPREG and is the preferred choice for direct replacement in existing designs.

Secondary Recommendation: TL1431CLPME3 (Texas Instruments)

TL1431CLPME3 provides equivalent performance with ±0.4% tolerance and matching operating temperature range. As an active product from a major manufacturer, this part offers long-term availability and is suitable for designs requiring precision voltage reference performance.

Alternative for Extended Temperature Range: KA431LZTA (onsemi)

KA431LZTA offers ±0.5% tolerance with extended operating temperature range (-25°C to 85°C) and active product status. This part is appropriate for applications requiring wider temperature operation where the relaxed tolerance specification is acceptable.

Cost-Effective Alternatives: KA431AZTA (onsemi), FAN431AZXA (Fairchild Semiconductor)

Both parts provide ±1% tolerance with extended temperature ranges and active product status. These options are suitable for applications where tolerance requirements are less stringent than the original specification.

Extended Temperature Range Option: AS431AZTR-E1, AS431AZTR-G1 (Diodes Incorporated)

These Diodes Incorporated parts offer ±0.5% tolerance with the widest operating temperature range (-40°C to 125°C) and active product status. The TO-92 package is mechanically compatible with TO-92-3 applications. These parts are ideal for industrial and automotive temperature environments.

All recommended substitutes maintain ROHS3 compliance and are REACH unaffected, consistent with the original part's regulatory status.

Frequently Asked Questions (FAQ)

Q: Can TL431BCLPRAG directly replace TL431BCLPREG without circuit modifications?

A: Yes. TL431BCLPRAG is a parametric equivalent with identical voltage output range (2.495V to 36V), tolerance (±0.4%), output current (100 mA), operating temperature (0°C to 70°C), and TO-92-3 package. No circuit modifications are required.

Q: What is the difference between ±0.4% and ±0.5% tolerance specifications?

A: Tolerance defines the maximum deviation of output voltage from the nominal value. ±0.4% tolerance is tighter than ±0.5%, providing better voltage regulation accuracy. Applications requiring precision voltage references should use ±0.4% parts. Applications with less stringent accuracy requirements can use ±0.5% or ±1% alternatives.

Q: Are the Diodes Incorporated AS431 parts compatible with TO-92-3 footprints?

A: The AS431 series uses TO-92 packaging, which is mechanically compatible with TO-92-3 footprints. Both package types use three formed leads in the same physical configuration. Electrical compatibility is confirmed by matching voltage output range, current capability, and reference type.

Q: Which substitute part offers the best long-term availability?

A: TL431BCLPRAG (onsemi) and TL1431CLPME3 (Texas Instruments) are both active products from established manufacturers with high inventory levels, ensuring long-term availability. Both are recommended for new designs requiring sustained production support.

Q: Can I use a ±1% tolerance part in an application designed for ±0.4%?

A: No. Using a ±1% part in a circuit designed for ±0.4% tolerance will result in voltage regulation errors outside the original design specifications. Use only parts meeting or exceeding the original tolerance requirement unless the circuit design is re-evaluated and approved for the relaxed specification.

Q: What is the significance of the extended operating temperature range in AS431 parts?

A: The AS431 series operates from -40°C to 125°C, compared to the original 0°C to 70°C range. Extended temperature capability is essential for industrial, automotive, and harsh environment applications. Standard temperature range parts are sufficient for consumer and office equipment applications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All recommended substitute parts listed maintain ROHS3 compliance and REACH unaffected status, consistent with the original TL431BCLPREG regulatory requirements.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message