Semtech Corporation F20

Overview

TDS2211P from Semtech is a transient diverting suppressor designed for high-energy EOS protection of 22V voltage buses or I/O lines, featuring ±30kV IEC 61000-4-2 ESD immunity, 40A (8/20μs) peak pulse current handling, and a stable 27.5–28V clamping voltage across temperature and current range - deployed in USB Type-C PD input protection and industrial load switch front-end surge suppression.

For engineers reviewing the TDS2211P datasheet, pinout, applications, or equivalent options, key selection criteria include its constant-clamp FET-based architecture versus conventional TVS diodes, DFN-6 package footprint constraints, 175pF junction capacitance at 22V, and compatibility with ±1kV IEC 61000-4-5 unsymmetrical line surge testing.

Technical Context

The TDS2211P uses a surge-rated MOSFET as its primary shunt element, activated by a precision trigger circuit that senses overvoltage events above ~27V breakdown. Unlike conventional TVS diodes, its clamping voltage remains nearly flat (27.5–28V) from 24A to 40A (1.2/50μs + 8/20μs combination waveform, RS = 2Ω) due to decreasing R_DS(on) under surge conditions.

It operates from −40°C to +125°C with <20mΩ dynamic resistance (measured 1A–40A, 8/20μs), 130–600nA reverse leakage at 22V, and 175pF capacitance at 1MHz/22V - enabling robust protection without signal integrity degradation in high-speed bus interfaces like USB PD.

Key Specifications

Pinout & Package

Package: DFN-6 (1.6mm × 1.6mm × 0.55mm), RoHS-compliant, Pb-free, 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 flat 27.5–28V clamping at 40A and full temperature range - making it the only option among the three qualified for industrial 22V bus protection requiring simultaneous IEC 61000-4-2, -4-4, and -4-5 compliance.

Availability

TDS2211P is available at Aetrix Electronics and suitable for USB Type-C PD systems, industrial load switch front-ends, and IoT device power 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 high-performance analog and mixed-signal semiconductors for power management, protection, and signal integrity.

The TDS series targets high-reliability EOS protection where conventional TVS limitations - rising clamping voltage with current/temperature and limited surge endurance - compromise system robustness in industrial, computing, and USB-C applications.

FAQ

What is the maximum continuous operating voltage for the TDS2211P?

The TDS2211P has a reverse stand-off voltage (V_RWM) of 22V, meaning it can continuously withstand up to 22V DC or RMS on its IN pins relative to GND without significant leakage or degradation. This makes it suitable for 20V USB PD VBUS and 22V industrial power rails. Exceeding 22V risks premature triggering or accelerated wear. The TDS2211P is rated for this exact voltage - not higher.

How does the TDS2211P achieve constant clamping voltage across surge current?

The TDS2211P uses a surge-rated MOSFET as its shunt element, controlled by an integrated trigger circuit. As surge current increases, the FET's R_DS(on) decreases, counteracting IR rise - resulting in stable 27.5–28V clamping from 24A to 40A (1.2/50μs + 8/20μs). This differs fundamentally from TVS diodes, whose clamping rises linearly with current. The TDS2211P's architecture ensures predictable protection margins.

Can the TDS2211P replace a standard TVS diode in an existing design?

The TDS2211P is not a drop-in replacement for standard TVS diodes due to its 6-pin DFN layout and parallel pin grouping (Pins 4–6 for IN, Pins 1–3 for GND). It requires PCB layout revision to accommodate all six pins and low-inductance grounding. However, its superior clamping stability and 40A rating often justify redesign in high-reliability applications where the original TVS fails under thermal or current stress. Always verify layout and thermal relief for the TDS2211P.

What is the junction capacitance of the TDS2211P and why does it matter?

The TDS2211P exhibits 175pF junction capacitance at 22V and 1MHz. This value is critical for power rail protection: too high capacitance causes excessive inrush or resonant ringing during fast transients; too low may compromise surge energy absorption. At 175pF, the TDS2211P strikes a balance - low enough to avoid destabilizing USB PD power delivery loops, yet sufficient for effective energy diversion. This is measured and guaranteed per the TDS2211P datasheet.

Does the TDS2211P require external components for basic operation?

No, the TDS2211P is a fully self-contained transient suppressor requiring no external resistors, capacitors, or biasing. Its internal trigger circuit and shunt FET operate autonomously upon overvoltage detection. Layout best practices - such as short, wide traces to connector, multiple vias to ground plane, and placement adjacent to protected port - are essential for performance, but no discrete support components are needed. The TDS2211P functions as a two-terminal device electrically (IN-to-GND), despite its 6-pin physical package.