TL431BVLP Equivalent & Substitute Parts

Part Overview

The TL431BVLP is a shunt voltage reference IC manufactured by onsemi, designed for adjustable voltage regulation applications. This component provides a stable 2.495V to 36V adjustable output with ±0.4% tolerance and supports up to 100 mA output current in a TO-92-3 through-hole package. The part is currently obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications requiring shunt voltage reference functionality.

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	±0.4%
Temperature Coefficient	50ppm/°C Typical
Current - Cathode	1 mA
Operating Temperature	-40°C ~ 125°C (TA)
Mounting Type	Through Hole
Package / Case	TO-226-3, TO-92-3 Long Body
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution eligibility for the TL431BVLP is determined by the following critical parameters:

Reference Type: Shunt (all substitutes must be shunt-type voltage references)
Output Type: Adjustable (output voltage must be user-adjustable)
Voltage Range: Minimum 2.495V to maximum 36V output capability
Current Rating: 100 mA output current minimum
Package: TO-92-3 through-hole configuration
Tolerance: ±0.4% or better (lower tolerance values are acceptable)
Operating Temperature: Must support -40°C to 125°C range or equivalent industrial range

Substitutes are classified into two categories: Direct equivalents (identical electrical specifications and package) and similar alternatives (compatible electrical performance with minor parameter variations within acceptable engineering tolerances).

Parameter Comparison

Part Number	Manufacturer	Voltage Output (Min/Max)	Tolerance	Current Output	Cathode Current	Operating Temp	Product Status	RoHS Status
TL431BVLP	onsemi	2.495V / 36V	±0.4%	100 mA	1 mA	-40°C ~ 125°C	Obsolete	Non-compliant
TL431BVLPG	onsemi	2.495V / 36V	±0.4%	100 mA	1 mA	-40°C ~ 125°C	Obsolete	ROHS3 Compliant
TL431BQLP	Texas Instruments	2.495V / 36V	±0.5%	100 mA	700 µA	-40°C ~ 125°C	Active	ROHS3 Compliant
KA431AZBU	Fairchild Semiconductor	2.495V / 36V	±1%	100 mA	1 mA	-25°C ~ 85°C	Active	Not specified
LM431AIZ	Fairchild Semiconductor	2.5V / 36V	±2%	100 mA	1 mA	-40°C ~ 85°C	Active	Not specified
LT1431CZ#PBF	Analog Devices Inc.	2.5V / 36V	±0.4%	100 mA	1 mA	0°C ~ 70°C	Active	ROHS3 Compliant
LT1431IZ#PBF	Analog Devices Inc.	2.5V / 36V	±0.4%	100 mA	1 mA	-40°C ~ 85°C	Active	ROHS3 Compliant
TL1431ACZ	STMicroelectronics	2.5V / 36V	±0.25%	100 mA	600 µA	-20°C ~ 70°C	Active	ROHS3 Compliant
TL1431CLP	Texas Instruments	2.5V / 36V	±0.4%	100 mA	1 mA	0°C ~ 70°C	Active	ROHS3 Compliant
TL1431CLPE3	Texas Instruments	2.5V / 36V	±0.4%	100 mA	1 mA	0°C ~ 70°C	Obsolete	ROHS3 Compliant
TL1431IZ	STMicroelectronics	2.5V / 36V	±0.4%	100 mA	1 mA	-40°C ~ 105°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalent (Preferred for Replacement): TL431BVLPG from onsemi is the direct equivalent with identical electrical specifications and package configuration. This part maintains the same voltage output range (2.495V to 36V), tolerance (±0.4%), and operating temperature range (-40°C to 125°C). The primary difference is ROHS3 compliance, making it suitable for applications requiring modern environmental standards.

Active Production Alternatives: For applications where onsemi parts are unavailable, the following active production parts provide compatible substitution:

TL431BQLP (Texas Instruments): Maintains identical voltage range and operating temperature. Tolerance is ±0.5% (slightly relaxed from ±0.4%), and cathode current is 700 µA versus 1 mA. ROHS3 compliant and currently in active production.
LT1431IZ#PBF (Analog Devices Inc.): Provides ±0.4% tolerance matching the original specification. Output voltage minimum is 2.5V (5 mV higher than 2.495V). Operating temperature range is -40°C to 85°C (40°C narrower at the upper end). ROHS3 compliant and active production status.
TL1431IZ (STMicroelectronics): Offers ±0.4% tolerance with extended upper operating temperature to 105°C. Output voltage minimum is 2.5V. ROHS3 compliant and active production.

Limited Temperature Range Alternatives: KA431AZBU, LM431AIZ, LT1431CZ#PBF, and TL1431CLP have reduced operating temperature ranges (maximum 85°C or 70°C) compared to the original -40°C to 125°C specification. These are suitable only for applications with narrower temperature requirements.

Compliance Consideration: The original TL431BVLP is RoHS non-compliant. All recommended active production substitutes are ROHS3 compliant, supporting modern regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with ±0.5% tolerance instead of ±0.4%? A: Yes. The TL431BQLP with ±0.5% tolerance is electrically compatible. The tolerance difference of 0.1% represents a minor relaxation in output voltage accuracy. Verify that your circuit design accommodates this tolerance variation.

Q: What is the significance of the output voltage minimum difference between 2.495V and 2.5V? A: The 5 mV difference is within typical circuit tolerance margins for most applications. However, designs with tight voltage regulation requirements should verify compatibility with the specific substitute part's minimum output voltage.

Q: Are TO-92-3 and TO-226-3 packages interchangeable? A: Yes. TO-92-3 and TO-226-3 are equivalent designations for the same three-lead through-hole package. Both refer to the same physical form factor and pin configuration.

Q: Why do some substitutes have different cathode current specifications? A: Cathode current (typically 1 mA) represents the minimum operating current required to maintain regulation. Variations such as 700 µA or 600 µA indicate different internal circuit designs. Verify that your application's bias network supplies adequate cathode current for the selected substitute.

Q: Can I use a part with a narrower operating temperature range? A: Only if your application operates within that narrower range. The original TL431BVLP supports -40°C to 125°C. Substitutes with 0°C to 70°C or -25°C to 85°C ranges are unsuitable for applications requiring full industrial temperature coverage.

Q: Is ROHS3 compliance mandatory for my application? A: ROHS3 compliance is required for products sold in the European Union and many other markets. If your application has no regulatory requirement for RoHS compliance, the original TL431BVLP remains usable. However, active production parts with ROHS3 compliance are recommended for new designs and long-term availability.

Q: What is the difference between "Direct" and "Similar" substitutes? A: Direct substitutes (such as TL431BVLPG) have identical electrical specifications and package. Similar substitutes have compatible electrical performance with minor parameter variations that remain within acceptable engineering tolerances for most applications.

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