Semtech Corporation SCHJ15K

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 protection in USB Type-C PD and industrial load-switch inputs.

For engineers reviewing the TDS2211P datasheet, pinout, applications, or equivalent options, this device offers critical advantages over conventional TVS diodes-including near-constant clamping voltage (27.5–28V at 24–40A), ultra-low dynamic resistance (20mΩ), and minimal temperature drift-making it ideal for high-reliability 22V bus protection where voltage margin and thermal stability are design-critical.

Technical Context

The TDS2211P implements a voltage-triggered shunt architecture: a precision reference circuit detects overvoltage beyond ~25V breakdown, activating a low-R_DS(on) FET that diverts surge current to ground. Unlike TVS diodes governed by V_C = V_BR + I_PP × R_DYN, its clamping remains flat due to decreasing FET on-resistance under increasing current.

This architecture delivers 1120W peak pulse power handling, ±1kV (1.2/50μs) surge immunity per IEC 61000-4-5 on unsymmetrical lines, and stable 27.5–28V clamping from −40°C to +125°C-enabling single-device compliance in demanding industrial and USB PD applications without derating.

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 SP1003-022, the TDS2211P provides superior voltage margin control across temperature and current-critical for protecting 22V-rated silicon in USB PD and industrial systems-while occupying less board area than discrete TVS alternatives rated for equivalent surge energy.

Availability

TDS2211P is available at Aetrix Electronics and suitable for USB Type-C PD interfaces, industrial load switch inputs, and 22V storage device power rails requiring stable component supply with guaranteed long-term lifecycle support.

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 family was developed to replace conventional TVS diodes in high-voltage, high-energy EOS applications-delivering stable clamping, extended temperature resilience, and FET-based reliability for next-generation USB, industrial, and computing platforms.

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 (±30kV), EFT (±4kV), and surge (40A, 8/20μs)-away from sensitive downstream components. Unlike passive TVS diodes, it uses a triggered FET to maintain a stable 27.5–28V clamping voltage across its full operating range, making the TDS2211P especially effective for protecting 22V power rails in USB PD and industrial equipment.

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

The TDS2211P achieves near-constant clamping voltage (27.5–28V) across its rated 24–40A peak pulse current range and −40°C to +125°C temperature range, whereas standard TVS diodes exhibit linearly rising clamping (V_C = V_BR + I_PP × R_DYN) due to fixed dynamic resistance. This fundamental difference makes the TDS2211P more predictable and reliable for protecting voltage-sensitive ICs like USB PD controllers, especially at elevated temperatures where TVS clamping can exceed 38V.

What is the correct PCB layout practice for the TDS2211P?

For optimal performance, all three IN pins (4, 5, 6) must be connected in parallel to the protected line via a short, wide trace, and all three GND pins (1, 2, 3) must be tied directly to a solid ground plane using multiple vias. The TDS2211P should be placed as close as possible to the connector or surge entry point to minimize trace inductance. Avoid thermal pads-the device dissipates energy in the FET channel, not the junction, so no thermal relief is needed.

Can the TDS2211P be used to protect bidirectional data lines?

No-the TDS2211P is designed exclusively for unidirectional 22V power or I/O line protection. Its internal architecture connects all IN pins together and grounds all GND pins, providing only forward-blocking/reverse-shunting capability. For bidirectional data lines such as USB SS, DP/DM, or CC/SBU, low-capacitance TVS devices like RClamp3371ZC or uClamp2411ZA are recommended instead of the TDS2211P.

What is the meaning of "T22" marking code on the TDS2211P package?

The "T22" marking code on the top of the TDS2211P indicates the device's product family and working voltage rating-"T" denotes the Transient Diverting Suppressor series, and "22" specifies the 22V reverse stand-off voltage (V_RWM). This marking, along with a two-digit date code (e.g., "23" for 2023), appears laser-etched on the DFN package and is used for traceability and authenticity verification; the dot adjacent to Pin 1 confirms orientation.