Semtech Corporation 1N3957

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 stable clamping voltage across temperature and current range, enabling robust USB Type-C PD and load switch input protection.

For engineers reviewing the TDS2211P datasheet, pinout, applications, or equivalent options, this device offers constant clamping voltage (27.5–28V at 24–40A), ultra-low dynamic resistance (20mΩ), low leakage (<600nA), 175pF junction capacitance, and DFN 1.6×1.6mm package - critical for space-constrained industrial, IoT, and USB PD designs.

Technical Context

The TDS2211P implements an active shunt architecture: a precision trigger circuit detects overvoltage beyond ~25V breakdown and activates a low-R_DS(on) FET to divert transients 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 surge.

This architecture enables superior energy handling (1120W peak pulse power) while maintaining low capacitive loading (175pF at 22V, 1MHz) and minimal leakage (≤600nA at VRWM). The device is rated for unsymmetrical line protection with ±1kV surge (1.2/50μs voltage, 8/20μs current, RS = 42Ω) and meets IEC 61000-4-2/4-4/4-5 standards.

Key Specifications

Pinout & Package

Package: DFN 1.6mm × 1.6mm × 0.55mm, 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 SP1003-220K, the TDS2211P delivers uniquely stable 27.5–28V clamping across full current and temperature range - critical for protecting sensitive 22V-rated PD controllers and load switches where voltage margin is constrained.

Availability

TDS2211P is available at Aetrix Electronics and suitable for USB Type-C PD systems, industrial load switch inputs, and IoT power rail protection requiring stable component supply, long-term lifecycle support, and guaranteed RoHS/REACH compliance.

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 ICs for precision sensing, protection, and connectivity.

The TDS2211P belongs to Semtech's Transient Diverting Suppressor (TDS) family, engineered to replace conventional TVS diodes in high-reliability 20–30V power and interface protection applications where clamping stability and surge endurance are critical.

FAQ

What is the primary protection function of the TDS2211P?

The TDS2211P functions as an active transient diverting suppressor that protects 22V-rated power or I/O lines from EOS events including ESD (±30kV), EFT (±4kV), and surge (40A, 8/20μs). Unlike passive TVS diodes, it uses a triggered FET to achieve near-constant clamping voltage - making the TDS2211P especially effective for USB PD and industrial load switch inputs where voltage margin is tight.

How does the TDS2211P differ from standard TVS diodes in clamping behavior?

The TDS2211P maintains a stable clamping voltage of 27.5–28V across its full 24–40A peak pulse current range and from −40°C to +125°C, whereas standard TVS diodes exhibit rising clamping (e.g., VC = VBR + IPP × RDYN). This flat response is achieved via a low-R_DS(on) shunt FET activated by a precision trigger circuit - a key advantage of the TDS2211P in thermally demanding or high-surge applications.

Can the TDS2211P be used on USB Type-C superspeed differential pairs?

No - the TDS2211P is not intended for USB SuperSpeed (TX/RX) or DisplayPort/USB2.0 data lines due to its 175pF junction capacitance, which would distort high-speed signals. For those lines, Semtech recommends low-capacitance devices like RClamp3371ZC (<0.25pF). The TDS2211P is specifically designed for VBUS, CC, SBU, or other single-ended 22V power/data lines where its 22V working voltage and 40A surge rating apply.

What PCB layout practices are required to achieve full 40A surge rating for the TDS2211P?

To achieve the rated 40A (8/20μs) performance, all three IN pins (4, 5, 6) must be shorted together with a low-inductance trace to the protected line, and all three GND pins (1, 2, 3) must connect directly to a solid ground plane using multiple vias. The device must be placed adjacent to the connector - any trace inductance degrades clamping speed and increases overshoot. The TDS2211P datasheet explicitly states that incomplete pin connection reduces peak current capability.

Is the TDS2211P compliant with automotive AEC-Q200 or industrial safety standards?

The TDS2211P is not AEC-Q200 qualified and is not certified to IEC 61000-6-2/6-4 or UL 1449. It meets IEC 61000-4-2 (ESD), -4-4 (EFT), and -4-5 (surge) for system-level immunity testing, and is rated for industrial temperature range (−40°C to +125°C). Its RoHS/WEEE compliance and UL 94V-0 package make it suitable for industrial and consumer applications - but not for automotive or safety-critical systems unless validated per end-equipment requirements.