Semtech Corporation SC414MLTRT

Overview

SC414MLTRT 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 stable 27.5–28V clamping voltage across its full current and temperature range (−40°C to +125°C). It is used in USB Type-C PD bus protection where low, temperature-invariant clamping prevents damage to downstream controllers.

For engineers reviewing the SC414MLTRT datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage stability over temperature, dynamic resistance (<20 mΩ), junction capacitance (175 pF), and DFN 1.6×1.6mm 6-lead package compatibility with high-density USB and industrial PCB layouts.

Technical Context

The SC414MLTRT uses a surge-rated FET as the primary protection element, activated by a precision trigger circuit that senses overvoltage events. Unlike conventional TVS diodes, its clamping voltage remains nearly constant due to the FET's decreasing R_DS(on) under surge-enabling predictable protection at 27.5–28V up to 40A.

It operates across −40°C to +125°C with minimal drift in breakdown voltage (25–27.9V), reverse leakage (130–600 nA @ 22V), and clamping performance. Its 175 pF junction capacitance and 20 mΩ dynamic resistance support robust transient energy diversion without signal integrity compromise on 22V power rails.

Key Specifications

Pinout & Package

SC414MLTRT is housed in a Pb-free, RoHS-compliant DFN 1.6 mm × 1.6 mm × 0.55 mm 6-lead package with exposed thermal pad (not electrically connected). All pins must be soldered for rated surge performance: pins 1–3 are ground terminals; pins 4–6 are input terminals tied directly to the protected line.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TDS2211P, SC414MLTRT is an identical device with alternate part marking and reel packaging-no design or layout changes required. Versus uClamp2411ZA, SC414MLTRT provides 67% higher surge current rating and 5 V lower clamping, making it suitable for primary 22V power rail protection where uClamp2411ZA is limited to auxiliary signal lines.

Availability

SC414MLTRT is available at Aetrix Electronics and suitable for USB Type-C PD designs, industrial load switch interfaces, and IoT edge node power rails requiring stable component supply, consistent surge performance, and long-term obsolescence management.

Supply support for SC414MLTRT 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 high-performance analog and mixed-signal semiconductors for power management, protection, and signal integrity.

The SC414MLTRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line-engineered to replace traditional TVS diodes in high-reliability 22V power rail protection applications demanding stable clamping and wide temperature operation.

FAQ

What is the exact function of SC414MLTRT in a circuit?

The SC414MLTRT functions as a transient diverting suppressor that actively shunts high-energy EOS events-such as ESD, lightning surges, and switching transients-from a 22V power or I/O line to ground. It uses a precision-triggered FET to achieve stable 27.5–28 V clamping across its full 40A surge rating and −40°C to +125°C operating range, unlike passive TVS diodes whose clamping rises with current and temperature.

Is SC414MLTRT pin-compatible with other Semtech TDS devices?

No-SC414MLTRT is specifically configured as a 6-pin DFN device with three parallel input pins (4–6) and three parallel ground pins (1–3). Other Semtech TDS parts like TDS3301P use different pin counts and configurations. SC414MLTRT shares identical pinout and footprint only with TDS2211P, which is its direct functional and mechanical counterpart.

What is the maximum continuous operating voltage for SC414MLTRT?

The SC414MLTRT has a reverse stand-off voltage (V_RWM) of 22 V, meaning it can continuously block up to 22 V DC or RMS without conducting. This makes it suitable for nominal 20V USB PD buses and other 22V-rated power domains where reliable non-conduction during normal operation is required.

Does SC414MLTRT require a thermal pad or heatsink?

No-SC414MLTRT does not require a thermal pad or external heatsink. Its FET-based architecture dissipates surge energy efficiently, and the DFN package is rated for full 40A surge performance with standard PCB copper pours on pins 1–3 (GND) and pins 4–6 (IN). Layout guidelines emphasize low-inductance grounding-not thermal mass.

Can SC414MLTRT be used on data lines such as USB SuperSpeed differential pairs?

No-SC414MLTRT is not suitable for high-speed data lines. Its 175 pF junction capacitance would severely degrade signal integrity on USB 3.x or DisplayPort lanes. For those applications, Semtech recommends low-capacitance devices like RClamp3371ZC (<0.25 pF). SC414MLTRT is intended exclusively for 22V power rails and robust I/O lines where capacitance is not critical.