TL431BCLPRA Equivalent & Substitute Parts

Part Overview

The TL431BCLPRA is a shunt voltage reference IC manufactured by onsemi, designed for precision adjustable voltage reference applications. This component features a 2.495V adjustable output with ±0.4% tolerance and supports output currents up to 100 mA across a 36V range. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	TL431BCLPRA
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	RoHS non-compliant

Substitute Part Grouping Explanation

Substitute parts for the TL431BCLPRA are categorized based on the following substitution criteria:

Direct Manufacturer Equivalents maintain identical electrical specifications: 2.495V output, ±0.4% tolerance, 100 mA output current, 1 mA cathode current, and TO-92-3 package. These parts differ primarily in product status (active vs. obsolete) and RoHS compliance.

Similar Parts share core electrical characteristics but with relaxed tolerance specifications (±0.5% to ±1%) or extended operating temperature ranges (-25°C to 85°C or -40°C to 125°C). These maintain the same output voltage range, current ratings, and package form factor.

Parametric Equivalents provide identical electrical performance with different packaging or product status classifications while maintaining the same base specifications.

The key parameters determining substitutability are: reference type (shunt), output type (adjustable), voltage output range (2.495V to 2.5V minimum, 36V maximum), current output (100 mA), cathode current (1 mA), and package type (TO-92-3).

Parameter Comparison

Part Number	Manufacturer	Voltage Output (Min)	Voltage Output (Max)	Current Output	Tolerance	Temp Coefficient	Operating Temp	Package	Product Status	RoHS Status
TL431BCLPRA	onsemi	2.495V	36V	100 mA	±0.4%	50ppm/°C	0°C ~ 70°C	TO-92-3	Obsolete	RoHS non-compliant
TL431BCLPRAG	onsemi	2.495V	36V	100 mA	±0.4%	50ppm/°C	0°C ~ 70°C	TO-92-3	Active	ROHS3 Compliant
TL431BCLPRMG	onsemi	2.495V	36V	100 mA	±0.4%	50ppm/°C	0°C ~ 70°C	TO-92-3	Obsolete	ROHS3 Compliant
TL1431CLPME3	Texas Instruments	2.5V	36V	100 mA	±0.4%	—	0°C ~ 70°C	TO-92-3	Active	—
FAN431AZXA	Fairchild Semiconductor	2.495V	36V	100 mA	±1%	50ppm/°C	-25°C ~ 85°C	TO-92-3	Active	—
KA431AZTA	onsemi	2.495V	36V	100 mA	±1%	50ppm/°C	-25°C ~ 85°C	TO-92-3	Active	ROHS3 Compliant
KA431LZTA	onsemi	2.495V	36V	100 mA	±0.5%	50ppm/°C	-25°C ~ 85°C	TO-92-3	Active	ROHS3 Compliant
AS431AZTR-E1	Diodes Incorporated	2.5V	36V	100 mA	±0.5%	20ppm/°C	-40°C ~ 125°C	TO-92	Active	ROHS3 Compliant
AS431AZTR-G1	Diodes Incorporated	2.5V	36V	100 mA	±0.5%	20ppm/°C	-40°C ~ 125°C	TO-92	Active	ROHS3 Compliant
AS431BZTR-E1	Diodes Incorporated	2.5V	36V	100 mA	±1%	20ppm/°C	-40°C ~ 125°C	TO-92	Active	ROHS3 Compliant
AS431BZTR-G1	Diodes Incorporated	2.5V	36V	100 mA	±1%	20ppm/°C	-40°C ~ 125°C	TO-92	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: TL431BCLPRAG

TL431BCLPRAG is the direct equivalent from onsemi with identical electrical specifications (2.495V output, ±0.4% tolerance, 100 mA output current). This part maintains active product status and achieves ROHS3 compliance, addressing the obsolescence and regulatory limitations of the original TL431BCLPRA. Inventory availability is substantial at 13,000 units.

Secondary Recommendation: TL1431CLPME3

TL1431CLPME3 from Texas Instruments provides ±0.4% tolerance matching the original specification with active product status. The output voltage is specified at 2.5V (versus 2.495V), which remains within acceptable design margins for adjustable reference applications. This part supports the same operating temperature range and package form factor.

Alternative for Extended Temperature Range: KA431LZTA

KA431LZTA from onsemi offers ±0.5% tolerance with extended operating temperature range (-25°C to 85°C) and ROHS3 compliance. This part is suitable for applications requiring broader temperature performance while maintaining tight tolerance specifications. High inventory availability (25,300 units) supports production continuity.

Alternative for Relaxed Tolerance: KA431AZTA

KA431AZTA provides ±1% tolerance with extended temperature range and ROHS3 compliance. This part is appropriate for applications where tolerance relaxation is acceptable and extended temperature operation is required. Inventory is substantial at 189,715 units.

Cross-Manufacturer Alternative: AS431AZTR-G1 or AS431AZTR-E1

Diodes Incorporated AS431 series parts offer ±0.5% tolerance with superior temperature coefficient (20ppm/°C versus 50ppm/°C) and extended operating range (-40°C to 125°C). These parts provide enhanced performance characteristics with ROHS3 compliance and high inventory availability (150,200 and 117,200 units respectively).

Frequently Asked Questions (FAQ)

Q: Can TL431BCLPRAG directly replace TL431BCLPRA without circuit modifications?

A: Yes. TL431BCLPRAG maintains identical electrical specifications including output voltage (2.495V), tolerance (±0.4%), output current (100 mA), and package (TO-92-3). The primary differences are active product status and ROHS3 compliance. 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 specification. ±0.4% tolerance provides tighter voltage regulation than ±0.5%. Selection depends on application requirements for voltage accuracy. Parts with ±0.5% tolerance (KA431LZTA, AS431AZTR series) are suitable where slightly relaxed tolerance is acceptable.

Q: Why do some substitute parts specify 2.5V output instead of 2.495V?

A: Both 2.495V and 2.5V represent the minimum adjustable output voltage for shunt reference ICs in this family. The 0.005V difference is negligible in adjustable reference applications where the output voltage is set by external resistor networks. Both specifications are functionally equivalent for circuit design purposes.

Q: Are TO-92 and TO-92-3 packages interchangeable?

A: TO-92 and TO-92-3 (TO-226AA) are physically compatible through-hole packages with identical lead spacing and pin configuration. Parts specified as TO-92 can substitute for TO-92-3 applications without mechanical modification.

Q: What does ROHS3 compliance mean for this component?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. The original TL431BCLPRA is RoHS non-compliant. ROHS3-compliant alternatives (TL431BCLPRAG, KA431 series, AS431 series) are required for applications subject to RoHS regulations.

Q: Can I use AS431BZTR-G1 (±1% tolerance) in place of TL431BCLPRA (±0.4% tolerance)?

A: AS431BZTR-G1 can substitute if application tolerance requirements permit ±1% voltage deviation. The part maintains identical output current (100 mA), voltage range (36V maximum), and package form factor. However, the relaxed tolerance may not be suitable for precision voltage reference applications requiring ±0.4% accuracy.

Q: What is the significance of temperature coefficient differences between parts?

A: Temperature coefficient (ppm/°C) defines how output voltage changes with temperature. TL431BCLPRA and most onsemi/Fairchild parts specify 50ppm/°C, while Diodes Incorporated AS431 series specifies 20ppm/°C. Lower temperature coefficient indicates better voltage stability across temperature variations. AS431 parts provide superior temperature stability for applications with wide operating temperature ranges.

Q: Which substitute part offers the best overall performance?

A: AS431AZTR-G1 provides superior performance characteristics: ±0.5% tolerance, 20ppm/°C temperature coefficient (superior to 50ppm/°C), extended operating range (-40°C to 125°C), ROHS3 compliance, and high inventory availability (150,200 units). This part is suitable for demanding applications requiring enhanced temperature stability and regulatory compliance.

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