Semtech Corporation SCHJ37.5K

Overview

TDS2211P from Semtech is a transient diverting suppressor designed to protect 22V-rated I/O or power lines against EOS, ESD, and surge events. It delivers ±30kV IEC 61000-4-2 contact/air ESD immunity, 40A peak pulse current (8/20μs), 27.5–28V clamping voltage at 24–40A, and 175pF junction capacitance - enabling robust USB Type-C PD bus protection in space-constrained industrial and portable designs.

For engineers reviewing the TDS2211P datasheet, pinout, applications, or equivalent options, key selection criteria include its constant-clamp behavior across temperature and current, low 20mΩ dynamic resistance, DFN 1.6×1.6mm 6-lead package, and FET-based shunt architecture that avoids voltage rise with increasing IPP - critical for protecting sensitive 22V USB PD controllers and load switches.

Technical Context

The TDS2211P uses a surge-rated MOSFET as its primary protection element, activated by a precision trigger circuit when transient voltage exceeds breakdown. Unlike conventional TVS diodes, its clamping voltage remains stable - ~27.5–28V - from 24A to 40A (1.2/50μs + 8/20μs combination waveform) due to decreasing R_DS(on) under surge.

It operates over −40°C to +125°C with <600nA reverse leakage at 22V, 175pF capacitance at 22V/1MHz, and thermal stability confirmed across temperature sweeps in clamping, breakdown, and peak pulse current curves - making it suitable for high-reliability industrial and mobile applications where ambient temperature fluctuates.

Key Specifications

Pinout & Package

Package: DFN 1.6mm × 1.6mm × 0.55mm, 6-lead, Pb-free, RoHS/WEEE 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 TPD2E007DRYR, the TDS2211P uniquely combines 40A surge capability, temperature-stable 28V clamping, and FET-based architecture - making it the only single-component solution qualified for primary 22V power rail protection in USB PD, industrial load switches, and thermally demanding embedded systems.

Availability

TDS2211P is available at Aetrix Electronics and suitable for USB Type-C PD systems, industrial load switch inputs, and notebook 22V rail protection requiring stable component supply, long-term lifecycle support, and RoHS-compliant 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 analog and mixed-signal ICs for precision sensing, protection, and signal integrity.

The TDS family was developed to replace conventional TVS diodes in high-energy EOS applications - targeting USB PD, industrial power rails, and automotive body electronics where stable clamping and thermal resilience are mandatory.

FAQ

What is the primary protection function of the TDS2211P?

The TDS2211P functions as a transient diverting suppressor that protects 22V-rated power or I/O lines from electrical overstress events including ESD (±30kV), EFT (±4kV), and surge (40A, 8/20μs). Its FET-based shunt architecture actively clamps transients to 27.5–28V - significantly lower and more stable than standard TVS diodes - ensuring downstream components like USB PD controllers remain within safe operating limits.

Does the TDS2211P require external bias or control signals to operate?

No, the TDS2211P is fully autonomous and requires no external bias, enable signals, or configuration. It operates passively: the integrated trigger circuit detects overvoltage conditions and activates the internal shunt FET within nanoseconds. All six pins are either IN (pins 4–6) or GND (pins 1–3); no additional components or PCB traces beyond proper layout are needed for basic operation.

Can the TDS2211P be used on bidirectional data lines such as USB 2.0 D+/D−?

No, the TDS2211P is designed exclusively for unidirectional 22V power rail or single-ended I/O protection. Its pinout and internal architecture support only IN-to-GND conduction. For bidirectional data lines like USB 2.0 or DisplayPort, low-capacitance ESD suppressors such as RClamp3371ZC (0.25pF) must be used instead - the TDS2211P is not rated for signal integrity or bidirectional clamping.

How does the TDS2211P's clamping performance compare to standard TVS diodes at elevated temperatures?

Unlike standard TVS diodes whose clamping voltage increases with temperature - rising up to 38V at 125°C for a 22V device - the TDS2211P maintains 27.5–28V clamping across −40°C to +125°C. This stability is confirmed in the datasheet's "Clamping Voltage vs. Temperature" curve and results from its FET-based architecture, where R_DS(on) decreases with temperature, counteracting voltage drift.

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

To achieve the rated 40A (8/20μs) surge performance, all three GND pins (1–3) and all three IN pins (4–6) must be connected - no floating pins. Use wide, short traces to minimize inductance; place the TDS2211P within 5mm of the protected connector; connect GND pins to an internal ground plane using ≥4 vias; and avoid thermal relief on GND pads. Layout deviations directly reduce effective surge current handling.