Semtech Corporation SET111411

Overview

TDS2211P from Semtech is a transient diverting suppressor designed for high-energy EOS protection of 22V voltage buses or I/O lines, featuring ±30kV IEC 61000-4-2 ESD immunity, 40A (8/20μs) peak pulse current handling, 27.5–28V clamping voltage at 40A, and DFN 1.6×1.6mm 6-lead package - deployed in USB Type-C PD input protection and industrial load switch front-end surge suppression.

For engineers reviewing the TDS2211P datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage stability across temperature and current, low dynamic resistance (20mΩ), junction capacitance (175pF), and validated performance in ±1kV IEC 61000-4-5 unsymmetrical line surge testing.

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 FET when EOS voltage exceeds breakdown threshold - enabling near-constant clamping voltage independent of peak pulse current magnitude. Unlike conventional TVS diodes, its clamping behavior relies on R_DS(on) collapse rather than fixed dynamic resistance.

It operates over –40°C to +125°C, maintains stable 27.5–28V clamping from 24A to 40A (1.2/50μs + 8/20μs combination waveform, R_S = 2Ω), and delivers 1120W peak pulse power with only 20mΩ dynamic resistance - critical for protecting sensitive 22V-rated USB PD controllers and load switches without thermal derating.

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 SP1003-020, the TDS2211P uniquely delivers 27.5–28V clamping at 40A with negligible variation across temperature - making it the only option validated for 22V USB PD and industrial load switch protection where strict voltage margin is non-negotiable.

Availability

TDS2211P is available at Aetrix Electronics and suitable for USB Type-C PD interfaces, industrial load switch inputs, and IoT device power bus protection requiring stable component supply, long-term lifecycle support, and traceable 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 connectivity.

The TDS family was engineered specifically for high-energy EOS protection in next-generation power interfaces - targeting applications where traditional TVS limitations in clamping stability, temperature drift, and surge endurance compromise system reliability.

FAQ

What is the maximum clamping voltage of the TDS2211P at 40A surge current?

The TDS2211P clamps at 27.5–28V under 40A peak pulse current (1.2/50μs voltage + 8/20μs current combination waveform, R_S = 2Ω). This value is guaranteed across –40°C to +125°C and reflects the device's constant-clamp architecture - unlike TVS diodes, its clamping does not increase with current or temperature. The TDS2211P achieves this via a low-R_DS(on) shunt FET activated by an integrated trigger circuit.

Can the TDS2211P replace standard TVS diodes in USB PD designs?

Yes, the TDS2211P is a direct functional upgrade for 22V USB PD VBUS protection, offering superior clamping stability (27.5–28V vs. typical 35–40V for TVS), ±30kV ESD immunity, and 40A surge rating. Its DFN 1.6×1.6mm footprint is pin-compatible with many 6-lead TVS packages, but layout must connect all IN (pins 4–6) and GND (pins 1–3) terminals in parallel. The TDS2211P eliminates thermal derating concerns inherent in TVS solutions.

What is the junction capacitance of the TDS2211P and where is it appropriate to use?

The TDS2211P has a junction capacitance of 175pF at 22V and 1MHz - suitable for DC, power, and low-speed signal lines (e.g., VBUS, CC, SBU, enable rails) but not for USB SuperSpeed (TX/RX) or PCIe lanes requiring sub-0.5pF loading. It is commonly used alongside ultra-low-capacitance TVS like RClamp3371ZC (<0.25pF) in full USB-C protection schemes. The TDS2211P's capacitance remains stable across temperature and bias voltage.

Does the TDS2211P require a thermal pad or heatsink for 40A surge operation?

No, the TDS2211P does not require a thermal pad or external heatsink. Its FET-based architecture dissipates surge energy in the channel rather than the junction, and the DFN package is designed for direct PCB copper pour connection to ground - not thermal conduction. Layout guidelines specify connecting all GND pins (1–3) with multiple vias to an inner ground plane to minimize inductance, not to enhance thermal transfer. The TDS2211P's 1120W peak pulse power rating is achieved without thermal derating.

How does the TDS2211P's trigger circuit differ from conventional TVS avalanche behavior?

The TDS2211P uses a precision voltage-triggered circuit to activate a shunt FET, whereas conventional TVS diodes rely on PN-junction avalanche breakdown. This gives the TDS2211P near-constant clamping voltage (27.5–28V) across 1–40A and –40°C to +125°C - unlike TVS devices whose clamping rises linearly with current (V_C = V_BR + I_PP × R_DYN). The TDS2211P's trigger circuit ensures activation at a defined threshold, then leverages the FET's collapsing R_DS(on) to maintain low-voltage clamping - a fundamental architectural advantage confirmed in Figure 3 of the official datasheet.