TL431CDR-J Equivalent & Substitute Parts

Part Overview

The TL431CDR-J 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 ±2.2% tolerance and supports 100 mA output current. The part is currently in Last Time Buy status, indicating end-of-life phase. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications requiring shunt voltage reference functionality.

Substiute Parts

TL431CDR-J

Texas InstrumentsIn Stock: 8289TL431CDR-J Datasheet

Current PartRFQ

TL431AIDBZR

Texas InstrumentsIn Stock: 113487TL431AIDBZR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TL431CDR-J is determined by the following critical electrical and mechanical parameters:

• Reference Type: Shunt (must remain shunt topology)
• Output Type: Adjustable (must support adjustable output voltage)
• Voltage Range: 2.495V minimum to 36V maximum output capability
• Current Rating: 100 mA output current capacity
• Base Product Number: TL431 (same device family)
• RoHS Compliance: ROHS3 Compliant
• Mounting Type: Surface Mount

The TL431AIDBZR qualifies as a substitute based on matching all critical electrical parameters (shunt reference, adjustable output, 2.495V to 36V range, 100 mA output current) and maintaining the same base product number (TL431). Differences in tolerance, cathode current, operating temperature range, and package format are secondary considerations that do not prevent functional substitution in applications where the TL431CDR-J specifications are required.

Parameter Comparison

Engineering Selection Recommendations

The TL431AIDBZR is the recommended substitute for the TL431CDR-J based on the following engineering criteria:

• Both parts maintain identical core electrical specifications: shunt reference topology, adjustable output voltage range (2.495V to 36V), and 100 mA output current capacity.
• The TL431AIDBZR is in Active product status, ensuring continued availability and supply chain support, whereas the TL431CDR-J is in Last Time Buy status.
• Both parts are ROHS3 Compliant and REACH Unaffected, meeting regulatory requirements.
• The TL431AIDBZR offers improved tolerance (±1% versus ±2.2%), lower cathode current (700 µA versus 1 mA), and an extended operating temperature range (-40°C to 85°C versus 0°C to 70°C).
• Package format differs (SOT-23-3 versus 8-SOIC), requiring PCB layout modification but presenting no electrical incompatibility.

Frequently Asked Questions (FAQ)

Q: Can the TL431AIDBZR directly replace the TL431CDR-J without circuit modification?

A: The TL431AIDBZR is electrically compatible with the TL431CDR-J for all core shunt reference functions. However, the package format differs (SOT-23-3 versus 8-SOIC), requiring PCB footprint redesign. The improved tolerance and extended temperature range of the TL431AIDBZR provide additional performance margin in most applications.

Q: What is the significance of the tolerance difference (±2.2% versus ±1%)?

A: Tolerance specifies the accuracy of the output voltage reference. The TL431AIDBZR's ±1% tolerance is tighter than the TL431CDR-J's ±2.2%, meaning the output voltage will remain closer to the nominal 2.495V specification. This improvement benefits precision voltage regulation circuits.

Q: Why does the TL431AIDBZR have lower cathode current (700 µA versus 1 mA)?

A: Cathode current represents the minimum operating current required to maintain regulation. The TL431AIDBZR's lower cathode current reduces power consumption and allows operation in lower-current applications, providing design flexibility.

Q: Is the extended operating temperature range of the TL431AIDBZR (-40°C to 85°C) a requirement for substitution?

A: The extended temperature range is not a requirement for substitution but represents an advantage. If the original application operates within 0°C to 70°C, both parts perform identically. The TL431AIDBZR provides additional margin for applications with wider temperature requirements.

Q: Are there any compliance or certification differences between these parts?

A: Both parts are ROHS3 Compliant, REACH Unaffected, and carry identical ECCN and HTSUS classifications. No compliance barriers exist for substitution.