Semtech Corporation 1N5550

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 - 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 voltage stability under 40A surge, DFN-6 thermal and layout performance, 175pF junction capacitance at 22V, and compatibility with 22V bus systems requiring robust EOS resilience without voltage derating.

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 due to decreasing R_DS(on) under surge, not fixed dynamic resistance.

It operates across –40°C to +125°C with 22V reverse stand-off voltage, 25–27.9V breakdown, and 20mΩ dynamic resistance (measured 1–40A, 8/20μs), enabling reliable protection for 22V industrial and USB PD buses where thermal drift and current-dependent clamping are critical failure vectors.

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 SP1003-220K, TDS2211P provides superior clamping stability (27.5–28V vs. ≥35.5V), higher surge rating (40A vs. ≤12.3A), and temperature-invariant performance - making it the only option qualified for primary 22V industrial and USB PD bus protection where reliability under worst-case surge and thermal conditions is mandatory.

Availability

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

The TDS family was engineered specifically for high-energy EOS protection in 12–48V industrial and USB PD systems, replacing legacy TVS solutions with active FET-based clamping to eliminate thermal and current-dependent voltage drift.

FAQ

What is the maximum continuous operating voltage for the TDS2211P?

The TDS2211P has a reverse stand-off voltage (V_RWM) of 22 V, meaning it can continuously block up to 22 V in normal operation without entering conduction. This matches the maximum nominal voltage of USB PD 3.0 20V profiles and industrial 22V rails. Exceeding 22 V may cause leakage or premature triggering. The TDS2211P is rated for this exact voltage threshold, and its design ensures stable operation precisely at this limit.

How does the TDS2211P achieve stable clamping voltage across temperature?

The TDS2211P uses a surge-rated FET activated by a precision trigger circuit instead of a passive PN-junction. When triggered, the FET's R_DS(on) drops to ~20 mΩ, making clamping voltage dependent primarily on the trigger circuit's breakdown voltage - which is inherently temperature-stable. Unlike TVS diodes whose V_C rises with temperature, the TDS2211P maintains 27.5–28 V from –40°C to +125°C. This behavior is confirmed in Figure 3 of the TDS2211P datasheet.

Can the TDS2211P replace a standard TVS diode in an existing 22V design?

Yes, but layout and grounding must be updated: all three IN pins (4–6) and all three GND pins (1–3) must be shorted together and connected with low-inductance traces. The TDS2211P is not pin-compatible with 2-pin TVS diodes - it requires a 6-pin DFN footprint and shared-pin routing. Its superior clamping stability and 40A rating often allow reduction in board area versus stacked TVS solutions. Verify PCB land pattern against Semtech's DFN-6 drawing before migration.

What is the junction capacitance of the TDS2211P, and where should it be used?

The TDS2211P exhibits 175 pF junction capacitance at 22 V and 1 MHz, measured across IN-to-GND. This value is appropriate for 22V power rail and low-speed control line protection (e.g., load switch enable, CC lines), but too high for USB SuperSpeed (TX/RX) or PCIe lanes, which require <0.3 pF devices. Use TDS2211P on V_Bus, SBU, or load switch VIN - not on differential high-speed data paths. Its capacitance is stable across temperature and bias, per Figure 4 in the datasheet.

Does the TDS2211P require a thermal pad or heatsink?

No. The TDS2211P dissipates surge energy in the FET channel, not the junction, and its DFN package is rated for full 40A surge without external thermal management. Semtech explicitly states "no thermal pad is needed" in the datasheet (page 6). Layout best practice emphasizes low-inductance GND vias (not thermal mass) - multiple 0.3mm vias connecting pins 1–3 to inner ground planes reduce impedance and improve surge current handling. Thermal derating curves are not provided because junction temperature rise is negligible under single-event surge conditions.