TL431ACLPRA Equivalent & Substitute Parts

Part Overview

The TL431ACLPRA is a shunt voltage reference IC manufactured by onsemi, designed for adjustable voltage regulation applications. This component features 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 listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Active alternatives with identical or enhanced electrical characteristics are available from multiple manufacturers.

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	0°C ~ 70°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 parameter compatibility and product status. The primary substitution criteria are:

Critical Parameters for Substitution:

Reference Type: Shunt
Output Type: Adjustable
Voltage Range: 2.495V to 36V
Output Current: 100 mA
Tolerance: ±1% (or tighter)
Package: TO-92-3
Mounting: Through Hole

Substitution Categories:

Direct Substitutes (Identical Electrical Specifications): Parts with matching voltage range, current rating, tolerance, and operating temperature range. These include TL431ACLPRAG (onsemi), TL431ACLPR (Texas Instruments), TL431ACZ-AP (STMicroelectronics), and TL431ACZT (STMicroelectronics). All maintain ±1% tolerance and identical output specifications.

Upgrade Substitutes (Enhanced Operating Temperature): Parts with identical electrical specifications but extended operating temperature ranges, including FAN431AZXA (Fairchild Semiconductor, -25°C to 85°C), LM431BCZX (onsemi, -25°C to 85°C), and LM431BIZX (onsemi, -40°C to 85°C). These provide improved performance in wider temperature environments.

Industrial Grade Upgrades (Extended Temperature & Cathode Current): TL431AIZ-AP and TL431AIZT (STMicroelectronics) offer -40°C to 105°C operating range with 700 µA cathode current, suitable for industrial applications requiring enhanced thermal performance.

Similar Alternative (Tighter Tolerance): KA431LZTA (onsemi) provides ±0.5% tolerance versus the original ±1%, offering improved voltage accuracy while maintaining all other electrical parameters.

Parameter Comparison

Part Number	Manufacturer	Voltage Output (Min/Max)	Current Output	Tolerance	Operating Temp	Cathode Current	Product Status	RoHS Status
TL431ACLPRA	onsemi	2.495V / 36V	100 mA	±1%	0°C ~ 70°C	1 mA	Obsolete	Non-compliant
TL431ACLPRAG	onsemi	2.495V / 36V	100 mA	±1%	0°C ~ 70°C	1 mA	Active	ROHS3 Compliant
TL431ACLPR	Texas Instruments	2.495V / 36V	100 mA	±1%	0°C ~ 70°C	600 µA	Active	ROHS3 Compliant
TL431ACZ-AP	STMicroelectronics	2.495V / 36V	100 mA	±1%	0°C ~ 70°C	600 µA	Active	ROHS3 Compliant
TL431ACZT	STMicroelectronics	2.495V / 36V	100 mA	±1%	0°C ~ 70°C	600 µA	Active	ROHS3 Compliant
FAN431AZXA	Fairchild Semiconductor	2.495V / 36V	100 mA	±1%	-25°C ~ 85°C	1 mA	Active	Not specified
LM431BCZX	onsemi	2.495V / 36V	100 mA	±1%	-25°C ~ 85°C	1 mA	Active	ROHS3 Compliant
LM431BIZX	onsemi	2.495V / 36V	100 mA	±1%	-40°C ~ 85°C	1 mA	Active	ROHS3 Compliant
KA431LZTA	onsemi	2.495V / 36V	100 mA	±0.5%	-25°C ~ 85°C	1 mA	Active	ROHS3 Compliant
TL431AIZ-AP	STMicroelectronics	2.495V / 36V	100 mA	±1%	-40°C ~ 105°C	700 µA	Active	ROHS3 Compliant
TL431AIZT	STMicroelectronics	2.495V / 36V	100 mA	±1%	-40°C ~ 105°C	700 µA	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): Select TL431ACLPRAG, TL431ACLPR, TL431ACZ-AP, or TL431ACZT. All maintain the original 0°C to 70°C operating range and ±1% tolerance. TL431ACLPRAG offers the highest inventory availability (2,196 units) and ROHS3 compliance. Texas Instruments TL431ACLPR provides the largest stock (125,200 units) with active product status.

For Extended Temperature Applications: LM431BIZX (onsemi) extends the operating range to -40°C to 85°C while maintaining all electrical specifications and ROHS3 compliance. LM431BCZX provides -25°C to 85°C operation. FAN431AZXA (Fairchild Semiconductor) offers -25°C to 85°C with 6,912 units in stock.

For Industrial/High-Temperature Environments: TL431AIZ-AP or TL431AIZT (STMicroelectronics) support -40°C to 105°C operation, suitable for demanding thermal conditions. Both are ROHS3 compliant with active product status.

For Improved Voltage Accuracy: KA431LZTA (onsemi) provides ±0.5% tolerance versus ±1%, with 25,300 units available and ROHS3 compliance. This part is suitable when tighter voltage regulation is required.

All recommended substitutes are available in TO-92-3 package with through-hole mounting, ensuring mechanical compatibility with existing PCB designs.

Frequently Asked Questions (FAQ)

Q: Can I use TL431ACLPRAG as a direct replacement for TL431ACLPRA? A: Yes. TL431ACLPRAG is a direct substitute with identical electrical specifications (2.495V to 36V output, 100 mA, ±1% tolerance, 0°C to 70°C operating range). The primary difference is product status (active versus obsolete) and ROHS3 compliance. Both use TO-92-3 packaging.

Q: What is the difference between TL431ACLPR and TL431ACZ-AP? A: Both are direct electrical equivalents with ±1% tolerance and identical voltage/current ratings. The primary difference is manufacturer (Texas Instruments versus STMicroelectronics). TL431ACLPR has significantly higher inventory (125,200 units). Cathode current differs slightly (600 µA versus 1 mA in the original), which is not functionally significant for most applications.

Q: Can I use LM431BIZX in place of TL431ACLPRA? A: Yes, with the advantage of extended operating temperature (-40°C to 85°C versus 0°C to 70°C). All electrical specifications match: 2.495V to 36V output, 100 mA, ±1% tolerance. This is an upgrade substitute suitable for wider temperature environments.

Q: Is KA431LZTA compatible with my design? A: KA431LZTA is electrically compatible with identical voltage range and current rating. The key difference is tighter tolerance (±0.5% versus ±1%), which improves voltage accuracy. Operating temperature is -25°C to 85°C. Use this part if your design requires improved voltage regulation precision.

Q: What is the advantage of TL431AIZ-AP over other substitutes? A: TL431AIZ-AP extends the operating temperature range to -40°C to 105°C, making it suitable for industrial and automotive applications. It maintains ±1% tolerance and identical voltage/current specifications. Cathode current is 700 µA. This is an upgrade for high-temperature environments.

Q: Are all substitute parts ROHS3 compliant? A: Most active substitutes are ROHS3 compliant (TL431ACLPRAG, TL431ACLPR, TL431ACZ-AP, TL431ACZT, LM431BCZX, LM431BIZX, KA431LZTA, TL431AIZ-AP, TL431AIZT). FAN431AZXA does not specify RoHS status. The original TL431ACLPRA is RoHS non-compliant.

Q: Can I mix different manufacturers in the same production run? A: Yes. All substitute parts maintain identical electrical specifications and TO-92-3 packaging. However, verify cathode current specifications (ranging from 600 µA to 1 mA) if your circuit design is sensitive to bias current variations.

Q: Which substitute has the best inventory availability? A: TL431ACLPR (Texas Instruments) has the highest stock at 125,200 units. KA431LZTA (onsemi) has 25,300 units. LM431BIZX (onsemi) has 10,400 units. All are suitable for volume production.

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