Semtech Corporation SC4431CSK-1 TRT

Overview

SC4431CSK-1 TRT from Semtech is a Transient Diverting Suppressor (TDS) designed for high-energy EOS protection of 22V-rated power or I/O lines. It delivers ±30kV IEC 61000-4-2 ESD immunity, 40A peak pulse current (8/20μs), and a tightly regulated 27.5–28V clamping voltage across temperature and current range. It is deployed in USB Type-C PD input protection where stable clamping below controller damage thresholds is critical.

For engineers reviewing the SC4431CSK-1 TRT datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage stability over 40A surge current, DFN-6 thermal and layout performance, dynamic resistance under 20mΩ, and compatibility with industrial-grade operating temperatures (−40°C to +125°C).

Technical Context

The SC4431CSK-1 TRT uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit that senses overvoltage events. Unlike conventional TVS diodes, its clamping voltage remains nearly constant-27.5–28V-across 24A to 40A peak pulse currents due to decreasing R_DS(on) under surge conditions.

It operates with a 22V reverse stand-off voltage and 25–27.9V breakdown voltage, features 175pF junction capacitance at 22V/1MHz, and maintains stable performance from −40°C to +125°C ambient. Its solid-state architecture avoids junction heating limitations typical of PN-junction TVS devices.

Key Specifications

Pinout & Package

SC4431CSK-1 TRT is housed in a RoHS-compliant, halogen-free DFN package measuring 1.6 mm × 1.6 mm × 0.55 mm with 6 leads and UL 94V-0 molding compound. All pins must be soldered for full 40A surge rating.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar transient suppression applications.

Compared with TDS2211P.C, SC4431CSK-1 TRT offers identical protection performance but may differ in reel packaging configuration; versus uClamp2411ZA.TCT, SC4431CSK-1 TRT provides 82% higher surge current rating and 2V lower clamping-making it the sole suitable option for 22V power rail hardening.

Availability

SC4431CSK-1 TRT is available at Aetrix Electronics and suitable for USB Type-C PD interfaces, industrial load switch inputs, and 22V IoT power rail designs requiring stable component supply, long-term lifecycle assurance, and consistent surge performance across temperature extremes.

Supply support for SC4431CSK-1 TRT 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

Semtech Corporation is a U.S.-based fabless semiconductor company specializing in analog and mixed-signal ICs for precision sensing, protection, and signal integrity.

The SC4431CSK-1 TRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered to replace traditional TVS diodes in high-reliability 12–24V power rail protection where clamping voltage stability across current and temperature is mission-critical.

FAQ

What is the exact package type and dimensions of SC4431CSK-1 TRT?

SC4431CSK-1 TRT uses a 6-lead DFN package measuring 1.6 mm × 1.6 mm × 0.55 mm with exposed thermal pad (no metal slug). Pin 1 is marked by a laser dot; land pattern follows Semtech's recommended 0.30 mm pad width and 0.50 mm pitch. The device is Pb-free, halogen-free, and RoHS/WEEE compliant with UL 94V-0 flammability rating.

Does SC4431CSK-1 TRT meet IEC 61000-4-5 Level 4 surge immunity?

Yes, SC4431CSK-1 TRT is rated for 40A peak pulse current with an 8/20μs waveform and ±1kV combination wave (1.2/50μs voltage + 8/20μs current, R_S = 42Ω), satisfying IEC 61000-4-5 Level 4 requirements for 22V systems. Its 27.5–28V clamping ensures protected ICs remain within safe operating voltage limits during full-rated surge events.

How does SC4431CSK-1 TRT differ from standard TVS diodes in clamping behavior?

Unlike standard TVS diodes-whose clamping voltage rises linearly with peak current (V_C = V_BR + I_PP × R_DYN)-SC4431CSK-1 TRT uses a triggered FET architecture that maintains clamping voltage at 27.5–28V from 24A to 40A. This eliminates thermal derating and ensures predictable protection across temperature and surge magnitude.

Can SC4431CSK-1 TRT be used on high-speed data lines like USB SS or PCIe?

No, SC4431CSK-1 TRT is not suitable for high-speed data lines. Its 175pF junction capacitance at 22V would severely degrade signal integrity on SuperSpeed (5–10 Gbps), PCIe, or DisplayPort links. It is strictly intended for DC power rails and low-speed control lines (e.g., USB PD CC, load switch enable) where capacitance is non-critical.

What is the maximum operating temperature and leakage current specification for SC4431CSK-1 TRT?

SC4431CSK-1 TRT operates from −40°C to +125°C ambient. At 22V reverse bias and 25°C, its leakage current is 130–600 nA; at 125°C, leakage remains below 1 μA. This low, thermally stable leakage prevents unnecessary power drain in always-on IoT and industrial backup systems.