TL431BILP Equivalent & Substitute Parts

Part Overview

The TL431BILP is a shunt voltage reference IC manufactured by onsemi, designed for adjustable voltage regulation applications. This component features a 2.495V minimum output, 36V maximum output rating, and ±0.4% tolerance with 100 mA output capability in a TO-92-3 through-hole package. The part is currently listed as obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications.

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 ~ 85°C (TA)
Mounting Type	Through Hole
Package / Case	TO-226-3, TO-92-3 Long Body

Substitute Part Grouping Explanation

Substitution eligibility for the TL431BILP is determined by the following critical parameters:

Reference Type: Shunt (all substitutes must be shunt-type references)
Output Type: Adjustable (all substitutes must support adjustable output)
Voltage Range: Minimum 2.495V output, maximum 36V output
Current Rating: 100 mA output capability
Package: TO-92-3 through-hole configuration
Tolerance: ±0.4% or better (lower tolerance values are acceptable)
Operating Temperature: -40°C to 85°C minimum range coverage
Cathode Current: 1 mA nominal

Substitutes are classified into two categories: direct equivalents (identical electrical specifications) and similar parts (compatible within specified parameter ranges with minor deviations in tolerance, temperature coefficient, or operating temperature limits).

Parameter Comparison

Part Number	Manufacturer	Voltage Output (Min)	Voltage Output (Max)	Current Output	Tolerance	Temp Coeff	Operating Temp	Package	Status
TL431BILP	onsemi	2.495V	36V	100 mA	±0.4%	50ppm/°C	-40°C ~ 85°C	TO-92-3	Obsolete
TL431BILPG	onsemi	2.495V	36V	100 mA	±0.4%	50ppm/°C	-40°C ~ 85°C	TO-92-3	Active
KA431AZBU	Fairchild Semiconductor	2.495V	36V	100 mA	±1%	50ppm/°C	-25°C ~ 85°C	TO-92-3	Active
LM431AIZ	Fairchild Semiconductor	2.5V	36V	100 mA	±2%	50ppm/°C	-40°C ~ 85°C	TO-92-3	Active
LM431CCZ	onsemi	2.495V	36V	100 mA	±0.5%	50ppm/°C	-25°C ~ 85°C	TO-92-3	Active
LT1431CZ#PBF	Analog Devices Inc.	2.5V	36V	100 mA	±0.4%	30ppm/°C	0°C ~ 70°C	TO-92-3	Active
LT1431IZ#PBF	Analog Devices Inc.	2.5V	36V	100 mA	±0.4%	50ppm/°C	-40°C ~ 85°C	TO-92-3	Active
TL1431ACZ	STMicroelectronics	2.5V	36V	100 mA	±0.25%	90ppm/°C	-20°C ~ 70°C	TO-92-3	Active
TL1431CLP	Texas Instruments	2.5V	36V	100 mA	±0.4%	Not specified	0°C ~ 70°C	TO-92-3	Active
TL1431CLPE3	Texas Instruments	2.5V	36V	100 mA	±0.4%	Not specified	0°C ~ 70°C	TO-92-3	Obsolete
TL1431IZ	STMicroelectronics	2.5V	36V	100 mA	±0.4%	100ppm/°C	-40°C ~ 105°C	TO-92-3	Active

Engineering Selection Recommendations

Direct Equivalent (Recommended Primary Substitute): TL431BILPG is the direct equivalent to TL431BILP, offering identical electrical specifications with active product status and RoHS3 compliance. This part maintains the same ±0.4% tolerance, 50ppm/°C temperature coefficient, and full -40°C to 85°C operating range. Selection of TL431BILPG eliminates obsolescence risk while preserving circuit performance.

Compatible Substitutes with Acceptable Parameter Deviations:

LT1431IZ#PBF (Analog Devices) provides equivalent performance with ±0.4% tolerance and matching -40°C to 85°C operating range. The 2.5V minimum output (versus 2.495V) and 50ppm/°C temperature coefficient align with TL431BILP specifications. RoHS3 compliance and active status support long-term availability.

TL1431IZ (STMicroelectronics) offers extended operating temperature range (-40°C to 105°C) with ±0.4% tolerance. The 2.5V minimum output and 100ppm/°C temperature coefficient represent minor deviations acceptable for most applications. RoHS3 compliance ensures regulatory alignment.

LM431CCZ (onsemi) maintains 2.495V minimum output and ±0.5% tolerance with active status. The reduced operating temperature range (-25°C to 85°C) and ±0.5% tolerance represent acceptable trade-offs for applications not requiring full -40°C operation.

Substitutes with Tolerance or Temperature Trade-offs:

KA431AZBU (Fairchild Semiconductor) features ±1% tolerance and -25°C to 85°C operating range. Selection requires verification that circuit design tolerates ±1% reference accuracy.

LM431AIZ (Fairchild Semiconductor) provides ±2% tolerance with full -40°C to 85°C range. This part is suitable only for applications with relaxed accuracy requirements.

LT1431CZ#PBF (Analog Devices) offers superior ±0.4% tolerance but operates only 0°C to 70°C. Selection requires confirmation that application temperature limits align with this range.

TL1431ACZ (STMicroelectronics) provides superior ±0.25% tolerance with -20°C to 70°C range. The tighter tolerance supports precision applications; temperature range verification is required.

TL1431CLP (Texas Instruments) maintains ±0.4% tolerance with 0°C to 70°C operating range. Temperature range verification is necessary for applications requiring full -40°C operation.

Frequently Asked Questions (FAQ)

Q: Can TL431BILPG directly replace TL431BILP without circuit modification? A: Yes. TL431BILPG is electrically and mechanically identical to TL431BILP, with matching voltage output range (2.495V to 36V), ±0.4% tolerance, 100 mA output capability, and TO-92-3 package. The primary difference is active product status versus obsolete status.

Q: What is the minimum acceptable tolerance for substitution? A: The TL431BILP specifies ±0.4% tolerance. Substitutes with equal or better (lower) tolerance values are directly compatible. Parts with ±0.5% or ±1% tolerance introduce additional reference voltage variation and require circuit design verification.

Q: Are all listed substitutes available in TO-92-3 through-hole packaging? A: All substitutes listed are available in TO-92-3 through-hole configuration. Package compatibility is confirmed for direct PCB mounting without adapter requirements.

Q: What is the impact of operating temperature range differences? A: The TL431BILP operates -40°C to 85°C. Substitutes with narrower ranges (such as 0°C to 70°C) are suitable only for applications operating within those limits. Extended range parts (such as -40°C to 105°C) provide additional margin. Verify application temperature requirements before selection.

Q: How does temperature coefficient affect circuit performance? A: The TL431BILP specifies 50ppm/°C typical temperature coefficient. Substitutes with identical or lower coefficients (such as 30ppm/°C) provide improved temperature stability. Higher coefficients (such as 90ppm/°C or 100ppm/°C) introduce greater reference voltage drift across temperature range. Applications requiring precision voltage regulation should prioritize lower temperature coefficients.

Q: Is RoHS compliance required for substitution? A: The TL431BILP is RoHS non-compliant. Modern substitutes (TL431BILPG, LM431CCZ, LT1431 series, TL1431 series) are RoHS3 compliant. Selection of RoHS-compliant parts aligns with current regulatory requirements and supply chain standards.

Q: Can parts with different minimum output voltages (2.495V versus 2.5V) be interchanged? A: The 0.005V difference between 2.495V and 2.5V minimum output is negligible for most applications. Both values fall within typical circuit tolerance budgets. Verification is required only for applications with tight voltage regulation specifications.

Q: What is the significance of cathode current rating? A: The TL431BILP specifies 1 mA cathode current. All listed substitutes maintain 1 mA cathode current, ensuring compatible biasing requirements. This parameter does not differentiate substitution eligibility.

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