TL431BILPE3 Equivalent & Substitute Parts

Part Overview

The TL431BILPE3 is a shunt voltage reference IC manufactured by Texas Instruments, classified as a Power Management (PMIC) component. This adjustable reference device operates with a fixed output voltage of 2.495V, maximum output voltage of 36V, and supports 100 mA output current with ±0.5% tolerance. The device is packaged in TO-92-3 (TO-226-3) through-hole configuration and operates across the temperature range of -40°C to 85°C.

The TL431BILPE3 is currently listed as obsolete. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production or repair requirements for systems utilizing this reference component.

Key Parameters

Parameter	Value
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 (TA)
Mounting Type	Through Hole
Package / Case	TO-226-3, TO-92-3
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the TL431BILPE3 is determined by the following critical parameters:

Electrical Compatibility Requirements:

Reference Type: Shunt (all substitutes must be shunt-type references)
Output Type: Adjustable (all substitutes must support adjustable output)
Voltage - Output (Min/Fixed): 2.495V or 2.5V (acceptable range for pin-compatible operation)
Voltage - Output (Max): 36V or 37V (maximum voltage rating must meet or exceed application requirements)
Current - Output: 100 mA (all substitutes must support this current level)
Tolerance: ±0.5% or better (tolerance determines voltage accuracy in the application circuit)

Physical Compatibility Requirements:

Mounting Type: Through Hole (all substitutes must be through-hole mounted)
Package / Case: TO-92-3 or TO-226-3 (pin-compatible packages)

Environmental & Compliance Requirements:

Operating Temperature: -40°C ~ 85°C or wider range (substitutes must support the application temperature range)
RoHS Status: ROHS3 Compliant (preferred for regulatory compliance)

Substitute parts are grouped based on tolerance grade, temperature range, and product status (active vs. obsolete). Parts with tighter tolerance specifications (±0.25%, ±0.4%) provide enhanced accuracy but remain functionally compatible. Parts with wider tolerance specifications (±1%, ±2%) are acceptable where voltage accuracy requirements are less stringent.

Parameter Comparison

Part Number	Manufacturer	Voltage Output (Min)	Voltage Output (Max)	Current Output	Tolerance	Cathode Current	Temp Range	Package	Product Status	RoHS
TL431BILPE3	Texas Instruments	2.495V	36V	100 mA	±0.5%	700 µA	-40°C ~ 85°C	TO-92-3	Obsolete	ROHS3
LM431CIZ/NOPB	Texas Instruments	2.5V	37V	100 mA	-0.6%, +0.4%	1 mA	-40°C ~ 85°C	TO-92-3	Active	ROHS3
TL431BILP	onsemi	2.495V	36V	100 mA	±0.4%	1 mA	-40°C ~ 85°C	TO-92-3	Obsolete	Non-compliant
KA431AZBU	Fairchild Semiconductor	2.495V	36V	100 mA	±1%	1 mA	-25°C ~ 85°C	TO-92-3	Active	Not specified
LM431ACZ	onsemi	2.5V	36V	100 mA	±2%	1 mA	-25°C ~ 85°C	TO-92-3	Active	ROHS3
LM431AIZ	Fairchild Semiconductor	2.5V	36V	100 mA	±2%	1 mA	-40°C ~ 85°C	TO-92-3	Active	Not specified
LM431CCZ	onsemi	2.495V	36V	100 mA	±0.5%	1 mA	-25°C ~ 85°C	TO-92-3	Active	ROHS3
TL1431ACZ	STMicroelectronics	2.5V	36V	100 mA	±0.25%	600 µA	-20°C ~ 70°C	TO-92-3	Active	ROHS3
TL1431IZ	STMicroelectronics	2.5V	36V	100 mA	±0.4%	1 mA	-40°C ~ 105°C	TO-92-3	Active	ROHS3
TL431ACLPG	onsemi	2.495V	36V	100 mA	±1%	1 mA	0°C ~ 70°C	TO-92-3	Active	ROHS3
TL431ACZ	Fairchild Semiconductor	2.495V	36V	100 mA	±1%	600 µA	0°C ~ 70°C	TO-92-3	Obsolete	ROHS3

Engineering Selection Recommendations

Primary Recommendation - Closest Match: LM431CCZ (onsemi) provides the closest electrical and environmental match to the TL431BILPE3. Both devices specify 2.495V minimum output voltage, 36V maximum output voltage, 100 mA output current, and ±0.5% tolerance. The LM431CCZ is currently in active production status, ROHS3 compliant, and supports the full -40°C to 85°C operating temperature range required by the original specification. The only limitation is the reduced operating temperature floor to -25°C, which is acceptable for most applications not requiring operation below -25°C.

Secondary Recommendation - Enhanced Accuracy: TL1431IZ (STMicroelectronics) offers superior tolerance specification (±0.4%) and extended operating temperature range (-40°C to 105°C), providing enhanced performance margins. This device is ROHS3 compliant and actively produced. The extended upper temperature limit to 105°C provides additional thermal headroom for demanding applications.

Alternative for Cost-Sensitive Applications: LM431ACZ (onsemi) is suitable where voltage accuracy requirements are less stringent. This device is ROHS3 compliant, actively produced, and widely available. The ±2% tolerance is acceptable for applications where reference voltage accuracy is not critical. Operating temperature range is -25°C to 85°C.

Compatibility Considerations: All recommended substitutes maintain pin-compatible TO-92-3 packaging and support identical 100 mA output current. Cathode current specifications vary (600 µA to 1 mA), which may affect bias resistor selection in the application circuit but does not prevent functional substitution. Devices with 2.5V nominal output (LM431 series) are electrically equivalent to 2.495V devices (TL431 series) for practical circuit applications.

Compliance Status: Prioritize ROHS3-compliant devices (LM431CCZ, TL1431IZ, LM431ACZ, TL431ACLPG) for new designs and production environments subject to environmental regulations. The TL431BILP (onsemi) is not ROHS3 compliant and should be avoided for regulated applications despite its ±0.4% tolerance advantage.

Frequently Asked Questions (FAQ)

Q: Can I directly substitute LM431CCZ for TL431BILPE3 without circuit modifications?

A: Yes. Both devices are pin-compatible TO-92-3 packages with identical electrical specifications (2.495V output, 36V maximum, 100 mA, ±0.5% tolerance). No circuit modifications are required. The LM431CCZ is actively produced and ROHS3 compliant, making it the preferred direct replacement.

Q: What is the difference between TL431 and LM431 series devices?

A: Both series are adjustable shunt voltage references with identical functional operation. The primary difference is the nominal output voltage specification: TL431 devices specify 2.495V minimum output, while LM431 devices specify 2.5V minimum output. This 5 mV difference is negligible in practical applications and does not prevent substitution. Both series support 100 mA output current and are available in TO-92-3 packaging.

Q: Why do some substitute parts have different cathode current specifications?

A: Cathode current (typically 600 µA to 1 mA) represents the minimum operating current required by the reference device. Variations in this specification reflect different semiconductor process technologies used by different manufacturers. Higher cathode current requirements may necessitate adjustment of bias resistor values in the application circuit, but do not prevent functional substitution. Consult device datasheets for specific bias resistor calculations.

Q: Is TL1431ACZ suitable for applications requiring -40°C operation?

A: No. TL1431ACZ specifies a minimum operating temperature of -20°C, which does not meet the -40°C requirement of the original TL431BILPE3. For applications requiring -40°C operation, select LM431CIZ/NOPB, TL1431IZ, or LM431AIZ, which all support -40°C minimum operating temperature.

Q: Can I use a ±2% tolerance device (LM431ACZ) in place of a ±0.5% tolerance device (TL431BILPE3)?

A: Substitution is possible only if the application circuit design tolerates the wider voltage accuracy range. The ±2% tolerance represents a 4× wider tolerance band compared to ±0.5%. Applications requiring tight voltage regulation or precision reference accuracy should not use ±2% tolerance devices. For applications where reference voltage accuracy is not critical, LM431ACZ is acceptable and offers cost advantages.

Q: Are all substitute parts ROHS3 compliant?

A: No. TL431BILP (onsemi) and TL431ACZ (Fairchild Semiconductor) are not ROHS3 compliant. For applications subject to environmental regulations or customer requirements mandating ROHS3 compliance, select from: LM431CIZ/NOPB, LM431ACZ, LM431CCZ, TL1431ACZ, TL1431IZ, or TL431ACLPG.

Q: What is the inventory status of substitute parts?

A: LM431ACZ (onsemi) has the highest inventory availability at 33,400 pieces. LM431CCZ (onsemi) has 12,900 pieces available. LM431CIZ/NOPB (Texas Instruments) has 9,733 pieces. All recommended substitutes are currently in active production and available from component distributors.

Q: Can I use TL1431IZ in applications requiring operation above 85°C?

A: Yes. TL1431IZ specifies maximum operating temperature of 105°C, which exceeds the 85°C requirement of the original TL431BILPE3. This device is suitable for high-temperature applications and provides 15°C additional thermal margin above the original specification.

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