TL431CDBVRG4 Equivalent & Substitute Parts

Part Overview

The TL431CDBVRG4 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 TL431CDBVRG4 is currently listed 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

TL431CDBVRG4

Texas InstrumentsIn Stock: 4179TL431CDBVRG4 Datasheet

Current PartRFQ

TL431CL5T

STMicroelectronicsIn Stock: 4141TL431CL5T Datasheet

DirectRFQ

AS431BKTR-G1

Diodes IncorporatedIn Stock: 4229AS431BKTR-G1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the TL431CDBVRG4 are qualified based on the following critical parameters that determine functional compatibility:

Core Substitution Criteria:

• Reference Type: Shunt voltage reference
• Output Type: Adjustable
• Voltage Output Range: Minimum 2.495V, Maximum 36V
• Current Output: 100 mA capability
• Package: SOT-23-5 surface mount
• Tolerance: ±2.2% or better
• Current Cathode: 1 mA

The substitute parts identified maintain these core electrical and mechanical specifications, ensuring pin-compatible operation within existing circuit designs. Variations in tolerance, temperature coefficient, and operating temperature range are noted but do not preclude functional substitution when application requirements permit.

Parameter Comparison

Engineering Selection Recommendations

TL431CL5T (STMicroelectronics): This substitute maintains identical electrical specifications to the TL431CDBVRG4, including output voltage range, current capacity, and tolerance. Both devices operate within the 0°C to 70°C temperature range and are packaged identically in SOT-23-5. The TL431CL5T is currently in active production status, providing supply chain continuity. Both parts are ROHS3 compliant with MSL rating of 1, indicating unlimited moisture sensitivity protection. This part represents the closest functional equivalent.

AS431BKTR-G1 (Diodes Incorporated): This substitute offers improved tolerance specification (±1% versus ±2.2%) and includes a specified temperature coefficient of 20ppm/°C. The AS431BKTR-G1 operates across an extended temperature range of -40°C to 125°C, providing broader environmental capability than the original part. The device maintains identical output voltage maximum, current output, and cathode current specifications. The AS431BKTR-G1 is actively produced and ROHS3 compliant. The MSL rating of 3 requires moisture control during storage and handling. This part is suitable for applications requiring enhanced temperature performance or improved voltage accuracy.

Frequently Asked Questions (FAQ)

Q: Can TL431CL5T be used as a direct replacement for TL431CDBVRG4?

A: Yes. Both devices share identical electrical specifications for output voltage range (2.495V to 36V), output current (100 mA), tolerance (±2.2% and ±2.21% respectively), and cathode current (1 mA). Both are packaged in SOT-23-5 and operate within 0°C to 70°C. Pin compatibility and functional equivalence are confirmed.

Q: What are the differences between TL431CL5T and AS431BKTR-G1?

A: The primary differences are tolerance (±2.21% versus ±1%), temperature coefficient (not specified versus 20ppm/°C typical), operating temperature range (0°C to 70°C versus -40°C to 125°C), and MSL rating (1 versus 3). The AS431BKTR-G1 provides superior voltage accuracy and extended temperature operation. Both maintain identical output voltage and current specifications.

Q: Is the AS431BKTR-G1 suitable for applications requiring the original operating temperature range?

A: Yes. The AS431BKTR-G1 operating range of -40°C to 125°C encompasses the original TL431CDBVRG4 range of 0°C to 70°C. The extended range provides additional operational margin without compromising compatibility within the original specification window.

Q: What does MSL rating 3 mean for the AS431BKTR-G1?

A: MSL 3 indicates a moisture sensitivity level requiring protection for 168 hours of exposure to 85% relative humidity at 85°C before soldering. Components must be stored in dry conditions and baked according to IPC standards prior to assembly. MSL 1 components (TL431CDBVRG4 and TL431CL5T) have unlimited moisture protection and do not require pre-bake procedures.

Q: Are all three parts RoHS compliant?

A: Yes. The TL431CDBVRG4, TL431CL5T, and AS431BKTR-G1 are all ROHS3 compliant, meeting lead-free and restricted substance requirements for European and global markets.

Q: Can these parts be used interchangeably in existing PCB designs?

A: Yes. All three parts are packaged in SOT-23-5 with identical pin configurations. No PCB layout modifications are required for substitution. Electrical performance remains within acceptable parameters for standard voltage reference applications.