Semtech Corporation SC806IMLTRT

Overview

SC806IMLTRT from Semtech is a Transient Diverting Suppressor (TDS) designed for high-energy EOS/ESD protection of single 22V-rated power or I/O lines. It delivers ±30kV IEC 61000-4-2 ESD immunity, 40A peak pulse current (8/20μs), 27.5–28V clamping voltage at 40A, <20mΩ dynamic resistance, and 175pF junction capacitance - enabling robust USB PD and Type-C bus protection in space-constrained industrial and portable designs.

For engineers reviewing the SC806IMLTRT datasheet, pinout, applications, or equivalent options, this device offers stable clamping across temperature and current range - critical for protecting USB PD controllers, load switches, and IoT power rails where conventional TVS diodes exhibit rising V_C with IPP or temperature.

Technical Context

The SC806IMLTRT uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit that senses overvoltage events and rapidly turns on the shunt path. Unlike standard TVS diodes, its clamping voltage remains nearly constant (27.5–28V) from 24A to 40A due to decreasing R_DS(on) under surge conditions.

It operates across –40°C to +125°C with reverse stand-off voltage of 22V, breakdown voltage of 25–27.9V, and low leakage (<600nA at 22V). Its DFN 1.6×1.6×0.55mm package integrates three parallel input terminals (pins 4–6) and three ground terminals (pins 1–3) to maximize surge current handling and minimize parasitic inductance.

Key Specifications

Pinout & Package

SC806IMLTRT is housed in a Pb-free, RoHS-compliant DFN 1.6mm × 1.6mm × 0.55mm 6-lead package with exposed thermal pad (not electrically connected). All six terminals are required for full 40A surge rating: pins 1–3 serve as low-inductance ground return paths; pins 4–6 form a parallel input node for the protected line.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TDS2211P.C, SC806IMLTRT offers identical protection performance but may differ in reel packaging and logistics handling; compared with uClamp2411ZA, SC806IMLTRT provides 67% higher surge current rating and 2.5V lower clamping - making it the only suitable choice for 22V power rail hardening in USB PD and industrial systems.

Availability

SC806IMLTRT is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch inputs, and IoT device power rails requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for SC806IMLTRT 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 semiconductors for precision sensing, power management, and protection technologies.

The SC806IMLTRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered to replace conventional TVS diodes in high-energy EOS applications where flat clamping voltage and temperature stability are critical - especially in USB PD, industrial power, and ruggedized portable electronics.

FAQ

What is the primary function of the SC806IMLTRT?

The SC806IMLTRT is a Transient Diverting Suppressor designed to protect 22V-rated power or I/O lines from high-energy electrical overstress events including ESD (±30kV), EFT (±4kV), and surge (40A, 8/20μs). It uses an active FET-based shunt architecture to clamp transients at a stable 27.5–28V, unlike conventional TVS diodes whose clamping voltage rises with current and temperature. This makes SC806IMLTRT ideal for safeguarding USB PD controllers and industrial load switches.

Does the SC806IMLTRT require external bias or control signals?

No, the SC806IMLTRT operates autonomously without external bias, enable pins, or configuration interfaces. Its internal precision trigger circuit activates the shunt FET automatically when input voltage exceeds the breakdown threshold (~25–27.9V). The device draws only ≤600nA leakage current at 22V and requires no PCB layout for control traces - simplifying integration into USB PD, IoT, and industrial power designs.

Can SC806IMLTRT be used on high-speed data lines like USB SuperSpeed or PCIe?

No, SC806IMLTRT is not suitable for high-speed data lines. With 175pF junction capacitance at 22V, it would severely degrade signal integrity on differential pairs operating above ~100MHz. It is specifically intended for DC power rails and low-frequency I/O lines such as USB PD V_Bus, load switch inputs, or industrial sensor power feeds - where low capacitance is not required but high surge current and stable clamping are essential.

How does SC806IMLTRT compare to standard TVS diodes in thermal performance?

Unlike standard TVS diodes that dissipate surge energy in their PN junction - causing clamping voltage to increase and peak current rating to decrease with rising temperature - the SC806IMLTRT maintains a stable 27.5–28V clamping voltage from –40°C to +125°C. Its FET-based architecture shifts energy dissipation to the channel, avoiding junction thermal runaway. This ensures consistent protection margins in thermally demanding environments like enclosed industrial enclosures or high-power notebooks.

What PCB layout practices are critical for optimal SC806IMLTRT performance?

To achieve full 40A surge capability, all three GND pins (1–3) must connect to a solid ground plane using ≥3 vias per pin, and all three IN pins (4–6) must tie directly to the protected line via short, wide traces. Place SC806IMLTRT within 5mm of the connector entry point to minimize inductive coupling. Avoid thermal pads or solder mask openings under the package - energy is dissipated internally, and no external heatsinking is needed or recommended.