Semtech Corporation SM100

Overview

TDS2211P from Semtech is a transient diverting suppressor designed for high-energy EOS protection on 22V voltage buses or I/O lines, featuring ±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 - deployed in USB PD, USB Type-C, and industrial load switch input protection.

For engineers reviewing the TDS2211P datasheet, pinout, applications, or equivalent options, key selection considerations include its constant-clamp behavior across temperature and current, FET-based shunt architecture versus conventional TVS diodes, DFN 1.6×1.6mm 6-lead layout constraints, and compatibility with 22V operating bus systems requiring robust ±1kV surge (IEC 61000-4-5) compliance.

Technical Context

The TDS2211P employs a surge-rated FET as the primary protection element, activated by a precision trigger circuit that senses overvoltage events and drives the FET into low-R_DS(on) conduction. Its clamping voltage remains stable (27.5–28V) from −40°C to +125°C and across 24–40A peak pulse current due to negligible R_DS(on) variation.

Unlike conventional TVS diodes whose V_C rises linearly with I_PP and temperature (V_C = V_BR + I_PP × R_DYN), the TDS2211P maintains near-constant clamping by leveraging the FET's decreasing on-resistance under surge - delivering 27V clamping at 125°C vs. ~38V for comparable TVS devices.

Key Specifications

Pinout & Package

Package: DFN 1.6mm × 1.6mm × 0.55mm, 6-lead, Pb-free, RoHS/WEEE compliant, UL 94V-0 molding compound, tape-and-reel (3,000 pcs/reel).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMAJ22A and SP1003-220K, the TDS2211P uniquely delivers 27.5–28V clamping across full temperature and current range - enabling robust 22V system protection where conventional TVS devices exceed safe voltage thresholds under real-world surge and thermal conditions.

Availability

TDS2211P is available at Aetrix Electronics and suitable for USB Type-C interfaces, industrial load switch inputs, and IoT edge node power buses requiring stable component supply, long-term lifecycle support, and guaranteed surge performance consistency across production batches.

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 precision sensing, protection, and connectivity.

The TDS family was engineered specifically to replace conventional TVS diodes in high-reliability power rail protection, addressing clamping drift, temperature sensitivity, and surge derating limitations inherent in PN-junction devices.

FAQ

What is the primary protection mechanism used in the TDS2211P?

The TDS2211P uses a surge-rated FET as its main protection element, controlled by a precision trigger circuit. When an overvoltage event occurs, the trigger activates the FET into low-R_DS(on) conduction, shunting surge current to ground. This architecture enables near-constant clamping voltage - unlike conventional TVS diodes whose clamping rises with current and temperature. The TDS2211P's design ensures predictable protection for sensitive 22V systems.

Can the TDS2211P be used for protecting USB Type-C VBUS lines operating up to 20V?

Yes - the TDS2211P is explicitly validated for USB Type-C PD applications with nominal 20V and maximum 22V bus voltages. Its 22V working voltage (V_RWM) and 27.5–28V clamping at 40A ensure USB PD controllers remain within safe operating limits during ±1kV surge events and ±30kV ESD strikes. Semtech's reference design places the TDS2211P directly at the Type-C connector, confirming its suitability for this use case.

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

At 125°C, the TDS2211P maintains 27.5–28V clamping across its full 24–40A surge range, whereas standard TVS diodes like SMAJ22A exhibit significant clamping rise - often exceeding 40V at the same conditions. This difference stems from the TDS2211P's FET-based architecture, which eliminates the fixed R_DYN dependency of PN-junction devices. As a result, the TDS2211P provides more reliable protection in thermally demanding environments such as enclosed industrial enclosures or automotive cabins.

What is the correct PCB layout practice for achieving full 40A surge rating with the TDS2211P?

To achieve the full 40A peak pulse current rating, all three IN pins (4, 5, 6) must be shorted together via a low-inductance trace, and all three GND pins (1, 2, 3) must connect to a solid ground plane using multiple vias. Semtech specifies placement adjacent to the protected connector to minimize trace inductance. Failure to interconnect all pins reduces effective surge current handling and compromises clamping performance - the TDS2211P's datasheet requires this layout for rated operation.

Is the TDS2211P compatible with automated SMT assembly processes?

Yes - the TDS2211P uses a standard DFN 1.6×1.6mm 6-lead package with lead-free (Pb-free), halogen-free, RoHS/WEEE-compliant construction and UL 94V-0 molding compound. It supports standard reflow profiles (J-STD-020) and is supplied in 7-inch tape-and-reel format (3,000 units/reel) with optical fiducials and orientation marking (dot indicating Pin 1). Its small footprint and thermal characteristics are fully qualified for high-volume SMT manufacturing.