Semtech Corporation SFF30

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 of 27.5–28V across full current and temperature ranges, enabling robust protection in USB PD and industrial load-switch inputs.

For engineers reviewing the TDS2211P datasheet, pinout, applications, or equivalent options, key selection criteria include its 22V working voltage, 40A peak pulse rating, 20mΩ dynamic resistance, 175pF junction capacitance at 22V, and DFN 1.6×1.6mm 6-lead package - all critical for high-speed bus protection where clamping stability and board space are constrained.

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 stable because R_DS(on) decreases as current rises, minimizing V_C = V_BR + I_PP × R_DYN dependency.

This architecture delivers 27.5–28V clamping at both 24A and 40A (1.2/50μs + 8/20μs combination waveform, R_S = 2Ω), maintains <600nA leakage at 22V, and sustains performance from −40°C to +125°C - making it suitable for thermally demanding industrial and USB Type-C PD applications.

Key Specifications

Pinout & Package

Package: DFN 1.6mm × 1.6mm × 0.55mm, 6-lead, RoHS-compliant, UL 94V-0 molding compound, lead-free finish. Pin 1 marked with laser dot.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SP1003-02HTG and SMAJ22A, the TDS2211P offers superior clamping consistency (≤0.5V variation vs. >3V), lower dynamic resistance (20mΩ vs. >100mΩ), and guaranteed performance across −40°C to +125°C - making it the preferred choice for USB PD, industrial load switches, and thermally aggressive IoT deployments.

Availability

TDS2211P is available at Aetrix Electronics and suitable for USB Type-C PD interfaces, industrial load switch inputs, and IoT edge node power buses requiring stable component supply, long-term lifecycle support, and 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 semiconductors for power management, protection, sensing, and signal integrity.

The TDS series was developed to replace conventional TVS diodes in high-reliability 20–30V power rail protection, delivering stable clamping via active FET-based architecture for USB PD, industrial automation, and automotive body electronics.

FAQ

What is the primary protection function of the TDS2211P?

The TDS2211P functions as a transient diverting suppressor that actively shunts high-energy EOS events-including ESD (±30kV), EFT (±4kV), and surge (40A, 8/20μs)-away from sensitive downstream components. Unlike passive TVS diodes, it uses a triggered FET to maintain a stable 27.5–28V clamping voltage across its full operating temperature range and peak pulse current envelope, making the TDS2211P ideal for protecting USB PD controllers and industrial load switches.

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

No, the TDS2211P is not suitable for high-speed data lines. Its 175pF junction capacitance at 22V is optimized for DC-coupled power rails-not signal integrity-critical interfaces. For USB SuperSpeed (TX/RX), DP/DM, or PCIe lanes, Semtech recommends low-capacitance TVS devices such as RClamp3371ZC (<0.25pF). The TDS2211P is specifically designed for VBUS, CC, SBU, or load-switch input protection where bandwidth is not a constraint but clamping stability and surge energy handling are critical.

How does the TDS2211P achieve constant clamping voltage across varying surge currents?

The TDS2211P achieves constant clamping through its active FET-based architecture: a precision trigger circuit detects overvoltage and turns on a low-R_DS(on) shunt FET. As surge current increases, the FET's on-resistance decreases, counteracting the I×R voltage rise seen in conventional TVS diodes. This results in ≤0.5V variation in clamping voltage from 24A to 40A (1.2/50μs + 8/20μs waveform), a key differentiator confirmed in the TDS2211P datasheet Figure 3 and electrical characteristics table.

What is the correct PCB layout practice for optimal performance of the TDS2211P?

For optimal TDS2211P performance, place the device within 2mm of the protected connector. Connect all three IN pins (4, 5, 6) via a single low-inductance 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 pads-energy is dissipated internally. This layout minimizes parasitic inductance, ensures even current sharing across parallel terminals, and preserves the TDS2211P's specified 40A surge capability and 27.5–28V clamping performance.

Is the TDS2211P compliant with industry safety and environmental standards?

Yes, the TDS2211P is Pb-free, halogen-free, and RoHS/WEEE compliant. Its molding compound meets UL 94V-0 flammability rating. It is qualified per IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), and IEC 61000-4-5 (surge) standards. Operating temperature range is −40°C to +125°C, and junction/storage temperature extends to −55°C to +150°C. These specifications are fully documented in the official Semtech TDS2211P datasheet Rev 2.5.