TL431CPSR Equivalent & Substitute Parts

Part Overview

The TL431CPSR is a shunt voltage reference IC manufactured by Texas Instruments, designed for precision voltage regulation and reference applications. 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 classified as obsolete, making identification of compatible substitutes essential for ongoing design support and procurement planning. Active alternatives with identical electrical specifications are available to ensure design continuity and supply chain reliability.

Substiute Parts

TL431CPSR

Texas InstrumentsIn Stock: 2739TL431CPSR Datasheet

Current PartRFQ

TL431CDBZR

Texas InstrumentsIn Stock: 26288TL431CDBZR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TL431CPSR is determined by electrical parameter equivalence across the following criteria:

• Reference Type: Shunt voltage reference architecture
• Output Type: Adjustable output voltage capability
• Voltage Range: 2.495V minimum to 36V maximum output
• Current Rating: 100 mA output current capacity
• Tolerance: ±2.2% accuracy specification
• Cathode Current: 1 mA minimum operating current
• Temperature Range: 0°C to 70°C operating window
• Compliance: ROHS3 and REACH compliance status

The TL431CDBZR qualifies as a direct electrical substitute, maintaining all specified electrical parameters while offering an active product status and alternative packaging configuration (SOT-23-3 versus 8-SOIC).

Parameter Comparison

Engineering Selection Recommendations

The TL431CDBZR is the primary substitute for the obsolete TL431CPSR. Both devices maintain identical electrical specifications across all critical parameters: adjustable shunt reference architecture, 2.495V to 36V output range, 100 mA current capacity, and ±2.2% tolerance. The substitute part carries active product status, ensuring long-term availability and supply chain continuity.

The primary design consideration is package compatibility. The TL431CPSR uses 8-SOIC packaging, while the TL431CDBZR uses SOT-23-3 packaging. PCB layout and footprint modifications are required for implementation. Both parts maintain ROHS3 compliance and identical thermal operating ranges (0°C to 70°C).

Frequently Asked Questions (FAQ)

Q: Can the TL431CDBZR directly replace the TL431CPSR without circuit modifications?

A: Electrical substitution is direct. All voltage, current, and tolerance specifications are identical. However, package geometry differs (8-SOIC versus SOT-23-3), requiring PCB footprint redesign and layout adjustment.

Q: What is the primary reason for substitution?

A: The TL431CPSR is classified as obsolete. The TL431CDBZR provides equivalent electrical performance with active product status and assured long-term availability.

Q: Are there any compliance differences between the two parts?

A: Both parts maintain ROHS3 compliance and REACH unaffected status. No compliance barriers exist for substitution.

Q: Does the SOT-23-3 package affect thermal performance?

A: Both parts operate within the specified 0°C to 70°C temperature range. Package selection should be based on PCB thermal design requirements and available board space.

Q: What parameters must remain constant for substitution validity?

A: Reference type (shunt), output type (adjustable), voltage range (2.495V to 36V), current rating (100 mA), tolerance (±2.2%), and cathode current (1 mA) must all remain unchanged for functional equivalence.