Semtech Corporation SR3.3.TCT

Overview

TDS2211P from Semtech is a transient diverting suppressor designed for high-energy EOS protection of 22V-rated power or I/O lines, featuring ±30kV IEC 61000-4-2 ESD immunity, 40A peak pulse current (8/20μs), and stable 27.5–28V clamping across temperature and current range; it protects USB Type-C VBus, load switch inputs, and industrial power rails.

For engineers reviewing the TDS2211P datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, DFN-6 package layout guidance, real-world clamping behavior vs. conventional TVS, and validated alternatives for 22V bus protection in USB PD, IoT, and industrial equipment.

Technical Context

The TDS2211P uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit that turns on the shunt path when transient voltage exceeds breakdown. Unlike standard TVS diodes, its clamping voltage remains nearly constant due to decreasing R_DS(on) under surge-enabling predictable 27.5–28V clamping at both 24A and 40A (1.2/50μs + 8/20μs combo waveform, R_S = 2Ω).

It operates from −40°C to +125°C with <600nA reverse leakage at 22V, 175pF junction capacitance at 22V/1MHz, and 20mΩ dynamic resistance measured between 1A–40A (8/20μs). Its solid-state architecture avoids thermal derating limitations typical of junction-based TVS devices.

Key Specifications

Pinout & Package

Package: DFN 1.6mm × 1.6mm × 0.55mm, 6-lead, Pb-free, RoHS-compliant, UL 94V-0 molding compound. Exposed pad not present; all six terminals are signal/ground connections.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMAJ22A and TPD2E001DRYR, the TDS2211P uniquely delivers 40A surge handling with flat 27.5–28V clamping across temperature-making it the only option among the three qualified for USB PD VBus and industrial load switch front-end protection without derating or thermal uncertainty.

Availability

TDS2211P is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch inputs, and IoT edge node power rails requiring stable component supply, long-term lifecycle support, and guaranteed surge performance.

Supply support for TDS2211P 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 protection, signal integrity, and power management.

The TDS family was developed to overcome clamping voltage drift and thermal derating limitations of traditional TVS diodes-targeting high-reliability 22V–36V power rail protection in USB PD, industrial automation, and ruggedized IoT endpoints.

FAQ

What is the maximum operating temperature for the TDS2211P?

The TDS2211P is rated for continuous operation from −40°C to +125°C ambient temperature. Its clamping voltage remains stable across this full range, with no degradation in 40A surge capability or ESD immunity. This makes the TDS2211P suitable for under-hood automotive modules, industrial PLCs, and outdoor IoT gateways where thermal margins are tight. The TDS2211P maintains consistent performance without derating, unlike conventional TVS diodes whose clamping rises significantly above 85°C.

How does the TDS2211P differ from a standard TVS diode like SMAJ22A?

The TDS2211P uses a triggered FET architecture instead of a pn-junction diode, resulting in near-constant 27.5–28V clamping across 1A–40A and −40°C to +125°C-whereas SMAJ22A exhibits rising clamping (up to ~42V at 125°C) due to fixed dynamic resistance. The TDS2211P also handles 40A (8/20μs) versus SMAJ22A's 12.3A, and offers superior EFT immunity (±4kV vs. unspecified). These differences make the TDS2211P the only viable choice for USB PD VBus protection where thermal and current stability are mandatory.

Can the TDS2211P be used to protect USB Type-C CC lines?

No-the TDS2211P is not suitable for USB Type-C CC or SBU lines. It is designed for 22V power-line protection (e.g., VBus), with 175pF capacitance and 40A surge rating optimized for high-energy EOS events. For CC/SBU lines, Semtech recommends uClamp2411ZA-a 24V, 0.5pF ESD protector with ±20kV contact rating and ultra-low capacitance to preserve signal integrity. Using the TDS2211P on CC lines would overload the 3.3V logic interface and violate USB specification timing margins.

What is the recommended PCB layout for optimal surge performance of the TDS2211P?

Place the TDS2211P within 2mm of the protected connector. Connect all three IN pins (4, 5, 6) via a single short, wide trace to the protected line, and tie all three GND pins (1, 2, 3) directly to a solid ground plane using ≥3 vias. Avoid thermal relief on GND pads. Do not use an exposed thermal pad-energy is dissipated in the silicon FET, not the package. This layout minimizes parasitic inductance and ensures full 40A current sharing across all pins, as confirmed in Semtech's Application Note AN-1287.

Does the TDS2211P require external biasing or control signals?

No-the TDS2211P is a fully passive, self-triggering device with no external pins for enable, control, or bias. It operates autonomously: the internal trigger circuit activates the shunt FET when transient voltage exceeds its breakdown threshold (~25–27.9V), then resets automatically once the event subsides. There are no configuration registers, pull-up resistors, or timing components required-making the TDS2211P drop-in compatible with existing TVS footprints and eliminating firmware dependencies.