TL431BILP Equivalent & Substitute Parts

Part Overview

The TL431BILP is a shunt voltage reference IC manufactured by Texas Instruments, classified as a Power Management (PMIC) component. This adjustable reference device operates across a 2.495V to 36V output range with ±0.5% tolerance and supports 100 mA output current in a TO-92-3 through-hole package. The part is currently active in production with 2,320 units in stock.

Substitute parts are necessary when the primary part becomes unavailable, when alternative manufacturers' specifications better match application requirements, or when design flexibility across multiple sourcing channels is required. The following equivalent devices maintain functional compatibility while offering variations in tolerance, temperature coefficient, and operating temperature ranges.

Key Parameters

Parameter	TL431BILP
Manufacturer	Texas Instruments
Reference Type	Shunt
Output Type	Adjustable
Voltage - Output (Min/Fixed)	2.495V
Voltage - Output (Max)	36V
Current - Output	100 mA
Tolerance	±0.5%
Current - Cathode	700 µA
Operating Temperature	-40°C ~ 85°C
Package / Case	TO-92-3
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

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

Mandatory Compatibility Criteria:

Reference Type: Shunt (all substitutes must be shunt-type references)
Output Type: Adjustable (all substitutes must support adjustable output)
Voltage Range: Output minimum ≥ 2.495V and maximum ≥ 36V
Current - Output: 100 mA (all substitutes must support this rating)
Package / Case: TO-92-3 (physical and pin compatibility)
Mounting Type: Through Hole

Tolerance and Performance Variations: Substitutes are grouped by tolerance specification (±0.5%, ±1%, ±2%, ±0.25%, ±0.4%, -0.6%/+0.4%), which affects circuit accuracy but does not prevent functional substitution. Temperature coefficient and operating temperature ranges vary by manufacturer but do not restrict substitution in standard applications.

Manufacturer Variants: Equivalent devices are available from Texas Instruments, onsemi, Fairchild Semiconductor, and STMicroelectronics, all meeting the core electrical and mechanical requirements.

Parameter Comparison

Part Number	Manufacturer	Voltage Min	Voltage Max	Current Output	Tolerance	Temp Coeff	Operating Temp	Cathode Current	Product Status
TL431BILP	Texas Instruments	2.495V	36V	100 mA	±0.5%	-	-40°C ~ 85°C	700 µA	Active
LM431CIZ/NOPB	Texas Instruments	2.5V	37V	100 mA	-0.6%, +0.4%	50ppm/°C	-40°C ~ 85°C	1 mA	Active
KA431AZBU	Fairchild Semiconductor	2.495V	36V	100 mA	±1%	50ppm/°C	-25°C ~ 85°C	1 mA	Active
LM431ACZ	onsemi	2.5V	36V	100 mA	±2%	50ppm/°C	-25°C ~ 85°C	1 mA	Active
LM431AIZ	Fairchild Semiconductor	2.5V	36V	100 mA	±2%	50ppm/°C	-40°C ~ 85°C	1 mA	Active
LM431CCZ	onsemi	2.495V	36V	100 mA	±0.5%	50ppm/°C	-25°C ~ 85°C	1 mA	Active
TL1431ACZ	STMicroelectronics	2.5V	36V	100 mA	±0.25%	90ppm/°C	-20°C ~ 70°C	600 µA	Active
TL1431IZ	STMicroelectronics	2.5V	36V	100 mA	±0.4%	100ppm/°C	-40°C ~ 105°C	1 mA	Active
TL431ACLPG	onsemi	2.495V	36V	100 mA	±1%	50ppm/°C	0°C ~ 70°C	1 mA	Active
TL431ACZ	Fairchild Semiconductor	2.495V	36V	100 mA	±1%	-	0°C ~ 70°C	600 µA	Obsolete
TL431AILPG	onsemi	2.495V	36V	100 mA	±1%	50ppm/°C	-40°C ~ 85°C	1 mA	Active

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility): LM431CCZ (onsemi) and LM431CIZ/NOPB (Texas Instruments) are the closest functional equivalents, both maintaining ±0.5% tolerance matching the TL431BILP specification. Both are ROHS3 compliant and active in production. LM431CCZ operates across -25°C to 85°C, while LM431CIZ/NOPB extends to -40°C to 85°C, matching the original part's lower temperature limit.

Secondary Substitutes (Tolerance Trade-off): TL431AILPG (onsemi) and KA431AZBU (Fairchild Semiconductor) offer ±1% tolerance with active product status and ROHS3 compliance. TL431AILPG maintains the full -40°C to 85°C operating range. These parts are suitable when tolerance relaxation is acceptable.

Extended Temperature Range: TL1431IZ (STMicroelectronics) extends the upper operating temperature to 105°C with ±0.4% tolerance and ROHS3 compliance, suitable for high-temperature applications.

Avoid: TL431ACZ (Fairchild Semiconductor) is marked obsolete and should not be selected for new designs despite inventory availability.

Frequently Asked Questions (FAQ)

Q: Can I substitute TL431BILP with any part in this list? A: All listed parts are functionally compatible as shunt voltage references in TO-92-3 packages with 100 mA output capability. However, tolerance, temperature coefficient, and operating temperature ranges vary. Select based on your circuit's accuracy and thermal requirements.

Q: What is the difference between ±0.5% and ±1% tolerance? A: Tolerance specifies the maximum deviation of the output voltage from its nominal value. ±0.5% provides tighter accuracy (±12.5 mV at 2.5V nominal) compared to ±1% (±25 mV). Choose ±0.5% for precision voltage reference applications; ±1% is acceptable for general-purpose regulation.

Q: Does operating temperature range affect substitution? A: Operating temperature range defines the ambient conditions where the part functions within specification. TL431BILP operates -40°C to 85°C. Substitutes with narrower ranges (e.g., 0°C to 70°C) are unsuitable for applications requiring full -40°C operation. Verify your application's temperature requirements before selection.

Q: Are all substitutes ROHS3 compliant? A: All active parts listed are ROHS3 compliant. TL431ACZ (Fairchild, obsolete) is ROHS3 compliant but should not be used in new designs.

Q: What is cathode current significance? A: Cathode current (700 µA for TL431BILP, 1 mA for most substitutes) represents the minimum operating current required for proper device function. Higher cathode current increases power consumption. This parameter does not prevent substitution but affects circuit design.

Q: Can I use TL1431ACZ for improved accuracy? A: TL1431ACZ offers superior ±0.25% tolerance but operates only -20°C to 70°C, narrower than TL431BILP's -40°C to 85°C range. Use only if your application operates within -20°C to 70°C and requires the enhanced accuracy.

Q: Why is LM431CIZ/NOPB listed as a direct substitute? A: LM431CIZ/NOPB is manufactured by Texas Instruments (same as TL431BILP), maintains compatible voltage and current ratings, operates across the same temperature range, and is ROHS3 compliant. The asymmetric tolerance (-0.6%, +0.4%) differs from ±0.5% but provides equivalent functional performance in most applications.

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