Semtech Corporation SM30

Overview

TDS2211P from Semtech is a transient diverting suppressor designed for high-energy EOS protection of 22V-rated I/O or power lines, featuring ±30kV IEC 61000-4-2 ESD immunity, 40A peak pulse current (8/20μs), 27.5–28V clamping voltage at 40A, and 20mΩ dynamic resistance - deployed in USB Type-C PD bus protection and load switch input safeguarding.

For engineers reviewing the TDS2211P datasheet, pinout, applications, or equivalent options, key selection criteria include its constant-clamp behavior across temperature and current, low capacitance (175pF @ 22V), DFN 1.6×1.6mm 6-lead package, and FET-based shunt architecture enabling superior surge handling versus conventional TVS diodes.

Technical Context

The TDS2211P implements a precision-triggered surge-rated FET as its primary protection element, activated only during overvoltage events to minimize leakage and capacitive loading during normal operation. Its trigger circuit initiates conduction when transient voltage exceeds ~27V breakdown, turning on the shunt FET with ultra-low R_DS(on).

Clamping voltage remains stable (27.5–28V) from 24A to 40A peak pulse current and across –40°C to +125°C operating temperature due to the FET's decreasing on-resistance under surge conditions - unlike conventional TVS diodes whose V_C rises linearly with I_PP and temperature.

Key Specifications

Pinout & Package

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

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 delivers 9–10V lower clamping at rated current, 50–85% lower capacitance, and stable performance across temperature - making it uniquely suited for modern 22V USB PD and compact industrial power rail protection where voltage margin and board area are critical.

Availability

TDS2211P is available at Aetrix Electronics and suitable for USB Type-C PD interfaces, industrial load switch inputs, and notebook 22V system rail protection requiring stable component supply, long-term lifecycle support, and traceable 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 analog and mixed-signal semiconductors for power management, protection, sensing, and connectivity.

The TDS2211P belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered specifically to replace conventional TVS diodes in high-reliability 20–30V power and interface protection applications demanding constant clamping and thermal stability.

FAQ

What is the primary protection mechanism used in the TDS2211P?

The TDS2211P uses a surge-rated FET activated by a precision trigger circuit - not a conventional PN-junction TVS. When an overvoltage event exceeds ~27V, the trigger turns on the FET shunt path, providing low-impedance conduction to ground. This architecture yields near-constant clamping voltage (27.5–28V) across 24–40A and –40°C to +125°C, unlike TVS diodes whose clamping rises with current and temperature. The TDS2211P leverages this FET-based design to deliver superior EOS protection for 22V systems.

Can the TDS2211P be used for USB Type-C Power Delivery bus protection?

Yes - the TDS2211P is explicitly validated for USB Type-C PD bus protection in Semtech's application documentation. Its 22V working voltage matches the USB PD 5–20V nominal range (up to 22V max), and its 27.5–28V clamping ensures USB PD controllers (typically rated ≤30V) remain within safe operating limits during 40A surges. The device is recommended in conjunction with low-capacitance TVS arrays like RClamp3371ZC for SuperSpeed data lines, forming a complete Type-C protection solution. TDS2211P placement at the connector is critical for effective PD bus protection.

What is the significance of the TDS2211P's 20mΩ dynamic resistance?

The 20mΩ dynamic resistance (R_DYN) of the TDS2211P directly enables its hallmark constant-clamp behavior: as surge current increases from 24A to 40A, the FET's on-resistance decreases, counteracting the I×R voltage rise typical of TVS diodes. This results in clamping voltage remaining tightly bounded between 27.5V and 28V - a critical advantage for protecting 22V-rated ICs where even 1–2V excess can cause latch-up or permanent damage. The low R_DYN also minimizes power dissipation in the device itself, improving reliability under repeated surge events. TDS2211P achieves this via its integrated FET-shunt topology, not passive junction characteristics.

How should the TDS2211P be laid out on a PCB for optimal performance?

For optimal performance, all three IN pins (4, 5, 6) must be connected in parallel via a single short, wide trace to the protected line (e.g., USB-C VBUS), and all three GND pins (1, 2, 3) must connect directly to a solid ground plane using multiple vias - minimizing parasitic inductance. The TDS2211P must be placed as close as possible to the connector (ideally <5mm), with no other components between it and the entry point. Avoid routing sensitive traces near the device. Semtech's datasheet Figure 7 provides the exact land pattern and via recommendations for the 1.6×1.6mm DFN package. Proper layout is essential to achieve the full 40A rating and stable clamping of the TDS2211P.

Is the TDS2211P RoHS and halogen-free compliant?

Yes - the TDS2211P is fully RoHS and WEEE compliant, lead-free, and halogen-free, with a UL 94V-0 rated molding compound. Its lead finish is matte tin, and it ships in tape-and-reel packaging (3,000 units per 7-inch reel). These compliance attributes meet global environmental and safety standards for industrial, computing, and consumer electronics applications. The device's marking code "T22" followed by a date code is laser-etched on the top surface, and Pin 1 is indicated by a dot. All compliance documentation is available through Semtech's official product page and distributor portals for the TDS2211P.