Semtech Corporation SC4541ULTRT

Overview

SC4541ULTRT 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 stable 27.5–28V clamping across temperature and current range. Used in USB Type-C PD input protection to safeguard controllers from voltage overshoot.

For engineers reviewing the SC4541ULTRT datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage stability under surge, low dynamic resistance (20 mΩ), junction capacitance (175 pF), and DFN 1.6×1.6mm package suitability for space-constrained USB PD and industrial load switch inputs.

Technical Context

The SC4541ULTRT uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit when transient voltage exceeds breakdown. Unlike conventional TVS diodes, its clamping voltage remains nearly constant-27.5–28V at 24A and 40A-due to decreasing R_DS(on) under surge conditions.

It operates from −40°C to +125°C with reverse stand-off voltage of 22V, breakdown voltage of 25–27.9V, and reverse leakage <600 nA at 22V. Its 175 pF junction capacitance and 20 mΩ dynamic resistance support robust protection without signal integrity compromise on medium-speed bus lines.

Key Specifications

Pinout & Package

SC4541ULTRT is housed in a RoHS-compliant DFN 1.6 mm × 1.6 mm × 0.55 mm, 6-lead package with exposed pad-less construction and UL 94V-0 molding compound.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TDS2211P, SC4541ULTRT offers identical performance and form factor, enabling seamless substitution. Against SMAJ22A, SC4541ULTRT provides 14 V lower clamping at full surge, stable performance across temperature, and superior EFT immunity-critical for USB PD and industrial reliability.

Availability

SC4541ULTRT is available at Aetrix Electronics and suitable for USB Type-C PD designs, industrial load switch inputs, IoT edge node power rails, and storage device DC power inputs requiring stable component supply and long-term manufacturability.

Supply support for SC4541ULTRT 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 connectivity.

The SC4541ULTRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered to replace conventional TVS diodes in high-reliability 22V power rail protection where stable clamping and temperature resilience are mandatory.

FAQ

What is the exact package type and dimensions of SC4541ULTRT?

SC4541ULTRT uses a DFN package measuring 1.6 mm × 1.6 mm × 0.55 mm with six leads and no exposed thermal pad. Pin 1 is marked with a laser dot; pins 1–3 are GND, and pins 4–6 are IN. The package is Pb-free, halogen-free, and RoHS/WEEE compliant with UL 94V-0 flammability rating.

Does SC4541ULTRT require external bias or control signals to operate?

No, SC4541ULTRT is fully passive and self-triggering. It contains an integrated precision trigger circuit and surge-rated FET that activate automatically when transient voltage exceeds breakdown. No external power, enable pin, or configuration is needed - it functions as a two-terminal protection device.

How does SC4541ULTRT's clamping voltage compare to standard TVS diodes at elevated temperature?

At 125°C, SC4541ULTRT maintains clamping at 27.5–28 V across 24–40 A, whereas a typical 22V TVS like SMAJ22A clamps near 42 V at the same conditions. This 14 V difference directly improves margin for 30 V-rated PD controllers and eliminates thermal derating calculations in SC4541ULTRT designs.

Can SC4541ULTRT protect high-speed data lines such as USB 3.2 or PCIe?

No - SC4541ULTRT has 175 pF junction capacitance, which is too high for USB 3.2 Gen 2 (10 Gbps) or PCIe Gen 3+ signaling. It is intended for power rails and low-to-medium speed buses (e.g., USB 2.0, I²C, UART). For data line protection, Semtech recommends RClamp3371ZC (<0.25 pF) alongside SC4541ULTRT.

Is SC4541ULTRT pin-compatible with TDS2211P?

Yes - SC4541ULTRT is a direct replacement for TDS2211P with identical pin configuration (GND on pins 1–3, IN on pins 4–6), electrical specifications, package outline, and thermal behavior. No PCB layout or schematic changes are required when substituting SC4541ULTRT for TDS2211P.