Semtech Corporation SCH7500

Overview

TDS2211P from Semtech is a transient diverting suppressor designed to protect single 22V I/O or power lines against high-energy EOS events, featuring ±30kV IEC 61000-4-2 ESD immunity, 40A (8/20μs) peak pulse current handling, and stable 27.5–28V clamping voltage across temperature and current range-used 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 clamping voltage stability under 40A surge, DFN-6 thermal and layout performance, 175pF junction capacitance impact on signal integrity, and compatibility with 22V operating bus architectures in industrial and portable systems.

Technical Context

The TDS2211P uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit that turns on the shunt path when transient voltage exceeds breakdown threshold. Unlike conventional TVS diodes, its clamping voltage remains nearly constant due to decreasing R_DS(on) under increasing current.

It delivers 1120W peak pulse power at 8/20μs, maintains ≤600nA reverse leakage at 22V, and exhibits <20mΩ dynamic resistance between 1A–40A. Its functional architecture enables stable 27.5–28V clamping across –40°C to +125°C without thermal derating penalties.

Key Specifications

Pinout & Package

Package: DFN 1.6 mm × 1.6 mm × 0.55 mm, 6-lead, Pb-free, RoHS-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 SMAJ22A and TPD2E001DRYR, the TDS2211P uniquely combines 40A surge rating, 27.5–28V flat clamping, and 175pF capacitance in a 1.6 mm² package - making it the only option capable of protecting 22V power rails in USB-C PD and industrial load-switch applications without design compromise.

Availability

TDS2211P is available at Aetrix Electronics and suitable for USB Type-C PD implementations, industrial load switch inputs, and IoT edge node power rail protection requiring stable component supply across extended temperature ranges and long production lifecycles.

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 signal integrity.

The TDS2211P belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered specifically to replace conventional TVS diodes in high-reliability 22V power rail protection where clamping stability, temperature insensitivity, and surge endurance are critical.

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, lightning surges, and EFT-to ground using a precision-triggered FET. Unlike passive TVS diodes, it maintains a near-constant clamping voltage of 27.5–28V across its full 40A (8/20μs) rating and operating temperature range (–40°C to +125°C), making the TDS2211P ideal for protecting sensitive 22V power rails in USB-C PD and industrial systems.

Can the TDS2211P replace standard TVS diodes in 22V applications?

Yes, the TDS2211P can replace standard TVS diodes such as SMAJ22A in 22V applications-but with significant performance advantages. While SMAJ22A clamps at ~42V under 40A surge, the TDS2211P clamps at only 27.5–28V due to its FET-based architecture and <20mΩ dynamic resistance. This lower, stable clamping voltage allows tighter system voltage margins and eliminates thermal derating concerns, confirming the TDS2211P as a superior upgrade for demanding 22V rail protection.

What is the recommended PCB layout for optimal performance of the TDS2211P?

For optimal performance, place the TDS2211P as close as possible to the protected connector or entry point. Connect all three IN pins (4, 5, 6) via a single short, wide trace to the protected line, and tie all three GND pins (1, 2, 3) directly to a solid ground plane using multiple vias. Avoid thermal pads or isolated copper islands-energy is dissipated internally, and low-inductance grounding is essential to preserve the 27.5–28V clamping behavior of the TDS2211P under fast-rising transients.

Does the TDS2211P support bidirectional or unidirectional protection?

The TDS2211P provides unidirectional protection optimized for positive-going transients on 22V DC rails. Its electrical characteristics-including reverse stand-off voltage (V_RWM) of 22V and reverse breakdown voltage (V_BR) of 25–27.9V-are specified for operation between IN (pins 4–6) and GND (pins 1–3). It is not rated for reverse-polarity or AC-coupled signal line protection; for bidirectional data-line ESD, complementary devices like RClamp3371ZC should be used alongside the TDS2211P.

What is the junction capacitance of the TDS2211P and how does it affect USB-C VBUS applications?

The TDS2211P has a junction capacitance of 175pF at 22V and 1MHz. In USB-C VBUS applications, this value is carefully balanced: low enough to avoid disrupting PD communication timing (which operates at ~300kHz), yet high enough to provide effective low-impedance shunting for 8/20μs surges. Measured data confirms minimal impact on VBUS voltage droop during PD negotiation-making the TDS2211P a validated solution in commercial USB-C reference designs where both surge robustness and protocol fidelity are required.