NXP Semiconductors TL431SDT,215

Overview

TL431SDT,215 from Nexperia is a 2 % tolerance, adjustable precision shunt regulator in SOT23 package, designed for linear applications with cathode-anode voltage up to 36 V, sink current from 1 mA to 100 mA, and reference voltage of 2.495 V (typical) at 25 °C. It serves as a programmable voltage reference or precision current sink in feedback loops and voltage regulation circuits.

For engineers reviewing the TL431SDT,215 datasheet, TL431SDT,215 pinout, TL431SDT,215 application, or TL431SDT,215 equivalent, this page delivers verified electrical parameters, thermal behavior across −40 °C to +125 °C, dynamic impedance (0.2 Ω typ), ESD rating (4 kV HBM), and real-world stability data for linear regulator and SMPS feedback designs.

Technical Context

The TL431SDT,215 implements a three-terminal shunt topology with internal bandgap reference, error amplifier, and NPN output stage. Its normal pinning (cathode–ref–anode) enables direct integration into adjustable voltage dividers without external compensation in standard linear configurations.

It operates over −40 °C to +125 °C ambient temperature, supports cathode currents from 0.4 mA (min) to 100 mA (max), and maintains reference voltage drift ≤34 mV across its full temperature range - optimized for stable performance in automotive and industrial linear power stages.

Key Specifications

Pinout & Package

SOT23 plastic surface-mounted package (TO-236AB), 3-pin, 1.3 mm × 2.9 mm footprint, 1.1 mm height - compatible with standard reflow and wave soldering processes per JEDEC MS-012.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar shunt regulator applications.

Compared with TL431SDT,215, TL431ACDBZR offers improved initial accuracy but same thermal drift profile, while TL431BSDT further reduces V_ref uncertainty - both retain identical pin compatibility, thermal specs, and dynamic impedance, enabling drop-in upgrades where accuracy is prioritized over cost.

Availability

TL431SDT,215 is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC analog I/O conditioning, and consumer power adapter feedback loops requiring stable component supply with AEC-Q100 compliance and long-term lifecycle support.

Supply support for TL431SDT,215 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Nexperia is a global leader in discrete, logic, and PowerMOS semiconductors, formed in 2017 from the former NXP Standard Products division, with focus on automotive, industrial, computing, and consumer markets.

The TL431 family is part of Nexperia's precision analog portfolio, engineered specifically for reliable voltage reference and current regulation in linear and switching power applications across harsh environmental conditions.

FAQ

What is the reference voltage tolerance and temperature range for TL431SDT,215?

The TL431SDT,215 has a 2 % reference voltage tolerance (2440–2550 mV at 25 °C) and is rated for operation from −40 °C to +125 °C ambient temperature. Its reference voltage variation is specified at ≤34 mV over that full range, making it suitable for under-hood automotive use and industrial control environments where thermal stability is critical. This specification is confirmed in Table 10 of the Nexperia TL431 family datasheet Rev. 5.

Does TL431SDT,215 require an external compensation capacitor?

No, TL431SDT,215 is designed for stable operation without external compensation in standard linear configurations. The datasheet confirms stable behavior with ≥1 nF load capacitance across cathode-anode, validated up to 100 mA sink current. This eliminates the need for added capacitors in most shunt regulator and current sink implementations - a key advantage over earlier TL431 variants requiring careful phase-margin tuning.

What is the pin configuration and package type of TL431SDT,215?

TL431SDT,215 uses the normal pinning configuration in SOT23 (TO-236AB) package: Pin 1 = Cathode (k), Pin 2 = Reference (REF), Pin 3 = Anode (a). Its mechanical outline matches JEDEC MS-012, with dimensions 2.9 mm × 1.3 mm × 1.1 mm. This pinout is explicitly defined in Table 3 and Figure 39 of the official Nexperia datasheet.

How does TL431SDT,215 differ from TL431FDT and TL431MFDT variants?

TL431SDT,215 is optimized for standard linear applications, whereas TL431FDT and TL431MFDT offer enhanced EMI ruggedness for switch-mode power supplies. The TL431SDT,215 exhibits lower small-signal gain bandwidth and less aggressive high-frequency roll-off than FDT types - confirmed by Figures 15–17 showing reduced voltage amplification above 10 kHz. This makes TL431SDT,215 more suitable for noise-sensitive analog references than SMPS feedback.

Is TL431SDT,215 AEC-Q100 qualified, and for which grade?

Yes, TL431SDT,215 is AEC-Q100 qualified for Grade 1 (−40 °C to +125 °C), as stated in Section 11.1 of the Nexperia TL431 family datasheet. This qualification covers stress testing for high-temperature operating life, temperature cycling, and ESD - confirming suitability for automotive powertrain, chassis, and body electronics where reliability under thermal and electrical stress is mandatory.