Semtech Corporation 3SM6

Overview

TDS2211P from Semtech is a transient diverting suppressor designed to protect 22V-rated I/O or power lines against high-energy EOS events including ESD (±30kV contact/air), EFT (±4kV), and surge (40A, 8/20μs). It uses a surge-rated FET with precision trigger circuitry to deliver near-constant clamping voltage (27.5–28V) across full current and temperature ranges, enabling robust protection in USB PD and load switch input circuits.

For engineers reviewing the TDS2211P datasheet, pinout, applications, or equivalent options, key selection criteria include its 22V working voltage, 40A peak pulse current rating, 20mΩ dynamic resistance, DFN 1.6×1.6mm 6-lead package, and stable clamping performance under industrial temperature extremes (−40°C to +125°C).

Technical Context

The TDS2211P implements an active shunt architecture: a precision trigger circuit detects overvoltage transients and activates a low-R_DS(on) FET to divert surge current to ground. Unlike passive TVS diodes, its clamping voltage remains nearly flat (27.5–28V) from 24A to 40A and across −40°C to +125°C due to decreasing FET on-resistance under increasing current.

This architecture delivers superior thermal stability and lower clamping than conventional TVS devices-e.g., at 125°C and 24A, TDS2211P clamps at ~27V versus ~38V for a comparable TVS-making it suitable for high-reliability 22V bus protection where voltage margin is constrained by downstream IC tolerances.

Key Specifications

Pinout & Package

Package: DFN 1.6 mm × 1.6 mm × 0.55 mm, 6-lead, RoHS-compliant, UL 94V-0 molding compound, lead-free finish.

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 combines 40A surge rating, 27.5–28V flat clamping, and −40°C to +125°C stability-making it the only option among the three capable of protecting 22V power rails in thermally demanding industrial USB PD and load switch applications without derating.

Availability

TDS2211P is available at Aetrix Electronics and suitable for USB Type-C power delivery interfaces, industrial load switch inputs, and IoT device power rails requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.

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 high-performance analog and mixed-signal ICs for power management, protection, sensing, and connectivity.

The TDS product line was developed to replace conventional TVS diodes in high-energy EOS protection applications, targeting designers needing flat-clamping, temperature-stable, and space-efficient alternatives for 12–36V industrial, computing, and USB-C infrastructure.

FAQ

What is the primary circuit function of the TDS2211P?

The TDS2211P functions as an active transient diverting suppressor for 22V power or I/O lines. It uses a triggered FET shunt architecture-not a passive diode-to clamp voltage spikes from ESD, EFT, and surge events. Its core purpose is to maintain a stable 27.5–28V clamping level across 24–40A surge currents and −40°C to +125°C, protecting downstream ICs like USB PD controllers and load switches. This behavior is fundamentally different from standard TVS diodes.

Does the TDS2211P require external bias or control signals to operate?

No, the TDS2211P operates autonomously with no external bias, enable pins, or configuration required. Its internal precision trigger circuit monitors voltage across pins 4–6 and pins 1–3; when an overvoltage event exceeds the trigger threshold, it automatically activates the shunt FET. The TDS2211P draws only 600nA leakage current at 22V and remains fully passive until a transient occurs-making it drop-in compatible with existing TVS placements.

Can the TDS2211P be used on high-speed data lines such as USB SuperSpeed or PCIe?

No, the TDS2211P 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 ~10MHz. It is explicitly designed for DC or low-frequency power and control lines-as confirmed by its application focus on USB PD V_BUS, load switch inputs, and industrial power rails. For SuperSpeed lanes, Semtech recommends low-capacitance devices like RClamp3371ZC (<0.25pF).

How does the TDS2211P's clamping performance compare to standard TVS diodes at elevated temperature?

Unlike standard TVS diodes-whose clamping voltage rises significantly with temperature-the TDS2211P maintains nearly constant clamping (27.5–28V) from −40°C to +125°C. At 125°C and 24A, a typical 22V TVS clamps near 38V due to positive temperature coefficient of dynamic resistance, while the TDS2211P remains at ~27V. This stability eliminates thermal derating calculations and ensures consistent protection margins in hot environments like enclosed industrial enclosures or laptop chassis.

What PCB layout practices are critical for achieving the rated 40A surge performance of the TDS2211P?

To achieve the full 40A (8/20μs) rating, all three IN pins (4, 5, 6) must be shorted together with a low-inductance trace, and all three GND pins (1, 2, 3) must connect directly to a solid ground plane using multiple vias. The device must be placed within 5mm of the protected connector. Splitting connections or routing through narrow traces increases inductance, causing voltage overshoot that defeats the TDS2211P's low-clamping advantage. Thermal relief patterns or isolated pads must be avoided-ground pins require direct copper pour attachment.