TL431BCDBVRG4 Equivalent & Substitute Parts

Part Overview

The TL431BCDBVRG4 is a shunt voltage reference IC manufactured by Texas Instruments, designed for adjustable voltage regulation applications. This component provides a fixed output voltage of 2.495V with a maximum rating of 36V and supports output currents up to 100 mA. The device is packaged in SOT-23-5 surface mount configuration.

The TL431BCDBVRG4 is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this reference voltage IC.

Substiute Parts

TL431BCDBVRG4

Texas InstrumentsIn Stock: 17537TL431BCDBVRG4 Datasheet

Current PartRFQ

AS431BKTR-G1

Diodes IncorporatedIn Stock: 4229AS431BKTR-G1 Datasheet

MFR RecommendedRFQ

TL431BW5-7

Diodes IncorporatedIn Stock: 5975TL431BW5-7 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the TL431BCDBVRG4 are identified based on the following critical parameters that determine functional compatibility:

Core Electrical Parameters:

• Reference Type: Shunt
• Output Type: Adjustable
• Voltage - Output (Min/Fixed): 2.495V or 2.5V
• Voltage - Output (Max): 36V
• Current - Output: 100 mA
• Tolerance: ±0.5% or ±1%

Physical & Environmental Parameters:

• Mounting Type: Surface Mount
• Package / Case: SC-74A, SOT-753 or equivalent SOT-23-5 footprint
• RoHS Status: ROHS3 Compliant

Substitute parts must maintain electrical equivalence within the specified voltage and current ranges. Tolerance variations of ±0.5% to ±1% are acceptable for applications where the original ±0.5% specification can accommodate ±1% tolerance. Package compatibility is determined by SOT-23-5 or SOT-25 surface mount configurations, both of which share compatible footprints for typical PCB layouts.

Parameter Comparison

Engineering Selection Recommendations

AS431BKTR-G1 (Diodes Incorporated)

This substitute is an active product with extended operating temperature range (-40°C ~ 125°C) compared to the original TL431BCDBVRG4 (0°C ~ 70°C). The AS431BKTR-G1 maintains the same voltage output maximum of 36V and current output of 100 mA. The tolerance specification is ±1% versus the original ±0.5%, representing a 0.5% relaxation in accuracy. The output voltage minimum is specified at 2.5V versus 2.495V, a difference of 5 mV. This part is ROHS3 compliant and supplied in Tape & Reel packaging. The cathode current is specified at 1 mA, higher than the original 600 µA specification.

TL431BW5-7 (Diodes Incorporated)

This substitute maintains the original tolerance specification of ±0.5% and output voltage minimum of 2.495V, providing direct electrical equivalence to the TL431BCDBVRG4. The operating temperature range is extended to -40°C ~ 125°C. The package is specified as SOT-25 rather than SOT-23-5, requiring verification of PCB footprint compatibility. The cathode current is 700 µA, marginally higher than the original 600 µA. This part is ROHS3 compliant with MSL rating of 1 (Unlimited), matching the original specification. The product status is active, ensuring ongoing availability.

Both substitutes are ROHS3 compliant and maintain core electrical parameters within acceptable engineering tolerances. Selection between these options depends on specific application requirements regarding tolerance precision, operating temperature range, and package footprint constraints.

Frequently Asked Questions (FAQ)

Q: Can AS431BKTR-G1 replace TL431BCDBVRG4 in all applications?

A: AS431BKTR-G1 is electrically compatible for applications where ±1% tolerance is acceptable. The output voltage minimum difference of 5 mV (2.5V vs 2.495V) and extended operating temperature range (-40°C ~ 125°C vs 0°C ~ 70°C) must be evaluated against specific circuit requirements. The higher cathode current specification (1 mA vs 600 µA) may affect bias network design.

Q: What is the difference between SOT-23-5 and SOT-25 packages?

A: Both are surface mount packages with compatible pin configurations for shunt voltage reference applications. SOT-25 is a variant of the SOT-23 family. PCB footprint compatibility should be verified with the specific layout design before substitution.

Q: Why is TL431BW5-7 preferred over AS431BKTR-G1?

A: TL431BW5-7 maintains the original ±0.5% tolerance and 2.495V output voltage specification, providing direct electrical equivalence. It also matches the original MSL rating of 1 (Unlimited). Selection depends on whether the application can tolerate the ±1% tolerance and 2.5V output voltage of AS431BKTR-G1.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. Both AS431BKTR-G1 and TL431BW5-7 are ROHS3 compliant, matching the original TL431BCDBVRG4 compliance status.

Q: What is the impact of different cathode current specifications?

A: Cathode current affects the bias network design and power dissipation characteristics. The original specification of 600 µA, AS431BKTR-G1 at 1 mA, and TL431BW5-7 at 700 µA represent minor variations. Circuit design must account for these differences in resistor network calculations.

Q: Can TL431BW5-7 be used in applications requiring the full 0°C ~ 70°C operating temperature range?

A: TL431BW5-7 has an extended operating temperature range of -40°C ~ 125°C, which encompasses the original 0°C ~ 70°C specification. This part is suitable for applications within the original temperature range and provides additional margin for extended temperature operation.