Semtech Corporation USC1104

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 peak pulse current (8/20μs), 27.5–28V clamping voltage at 40A, 20mΩ dynamic resistance, and 175pF junction capacitance - deployed in USB Type-C PD input protection and industrial load switch inputs.

For engineers reviewing the TDS2211P datasheet, pinout, applications, or equivalent options, key selection criteria include clamping stability across temperature and current, low R_DYN for consistent voltage limiting, DFN-6 package layout constraints, and compatibility with 22V bus systems requiring robust ±1kV surge (IEC 61000-4-5) and ±4kV EFT (IEC 61000-4-4) immunity.

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. Unlike conventional TVS diodes, its clamping voltage remains nearly constant (27.5–28V) from 24A to 40A due to decreasing R_DS(on) under surge conditions.

It operates over –40°C to +125°C, maintains stable clamping across temperature (±0.1V variation), and delivers 1120W peak pulse power with 20mΩ dynamic resistance measured between 1A and 40A (8/20μs). Its 175pF capacitance at 22V/1MHz supports high-speed line protection without signal integrity compromise.

Key Specifications

Pinout & Package

Package: DFN 1.6mm × 1.6mm × 0.55mm, 6-lead, RoHS-compliant, UL 94V-0 molding compound, lead-free finish, marked "T22" + date code.

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 stable 27.5–28V clamping across 40A and –40°C to +125°C, enabling reliable 22V bus protection without thermal or current derating - a capability absent in conventional TVS and polymer suppressors.

Availability

TDS2211P is available at Aetrix Electronics and suitable for USB Type-C PD interfaces, industrial load switch inputs, and 22V 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 signal integrity.

The TDS series was developed to overcome clamping voltage drift and thermal limitations of traditional TVS diodes, targeting high-reliability 20–30V power rail protection in USB, industrial, and automotive-edge applications.

FAQ

What is the primary protection function of the TDS2211P?

The TDS2211P functions as a transient diverting suppressor that protects 22V I/O or power lines by activating a low-R_DS(on) shunt FET during EOS events. Unlike TVS diodes, it maintains a stable 27.5–28V clamping voltage across 24A–40A surge currents and –40°C to +125°C, making it ideal for USB PD and industrial load switch inputs where voltage margin is tight. The TDS2211P achieves this via a precision trigger circuit and surge-rated FET architecture.

Can the TDS2211P replace a standard TVS diode in a 22V application?

Yes, the TDS2211P can replace standard TVS diodes in 22V applications - but only where clamping stability, low dynamic resistance, and high surge current (40A) are required. Standard TVS devices like SMAJ22A exhibit rising clamping voltage with current and temperature, often exceeding 35V at 125°C. The TDS2211P clamps consistently at ≤28V under identical conditions, offering superior protection for 24V-tolerant ICs. Always verify layout and grounding per Semtech's DFN-6 recommendations for the TDS2211P.

What is the significance of the 20mΩ dynamic resistance specification for the TDS2211P?

The 20mΩ dynamic resistance (R_DYN) of the TDS2211P reflects the effective on-resistance of its internal shunt FET during surge conduction. This ultra-low value ensures minimal voltage rise (ΔV = I × R_DYN) across the device - for example, just 0.8V additional drop at 40A - resulting in predictable, flat clamping behavior. It directly enables the TDS2211P's stable 27.5–28V clamping across current and temperature, distinguishing it from TVS diodes whose R_DYN is fixed and causes linear voltage increase. This is critical for protecting sensitive 24V-rated controllers.

How should the six pins of the TDS2211P be connected on the PCB?

All six pins of the TDS2211P must be used: Pins 1–3 are GND and must connect to a low-inductance ground plane using multiple vias; Pins 4–6 are IN and must be tied together via a short, wide trace directly to the protected line (e.g., USB PD V_BUS). This configuration maximizes surge current sharing and minimizes parasitic inductance. Semtech specifies that omitting any pin degrades peak pulse current capability and clamping performance. Layout must place the TDS2211P within 5mm of the connector, with no stubs or splits in the IN or GND paths.

Is the TDS2211P suitable for protecting USB Type-C superspeed data lines?

No, the TDS2211P is not suitable for USB Type-C superspeed (TX/RX) data lines. Its 175pF junction capacitance is appropriate for 22V power rails (e.g., V_BUS) but too high for high-speed differential signaling, which requires sub-0.3pF capacitance to avoid insertion loss and jitter. For superspeed lines, Semtech recommends low-capacitance TVS devices such as RClamp3371ZC (<0.25pF). The TDS2211P is intended exclusively for power-line or single-ended I/O protection - confirmed in its datasheet application diagrams and electrical specs.