Semtech Corporation F40A

Overview

TDS2211P from Semtech is a transient diverting suppressor designed for high-energy EOS protection of 22V-rated I/O or power lines, featuring ±30kV IEC 61000-4-2 ESD immunity, 40A peak pulse current (8/20μs), 27.5–28V clamping voltage at 40A, and 20mΩ dynamic resistance - deployed in USB Type-C PD input protection and industrial load switch front-end circuits.

For engineers reviewing the TDS2211P datasheet, pinout, applications, or equivalent options, key selection criteria include clamping stability across temperature (-40°C to +125°C), low capacitance (175pF @ 22V), DFN 1.6×1.6mm 6-lead layout compatibility, and FET-based shunt architecture enabling constant-voltage clamping unlike conventional TVS diodes.

Technical Context

The TDS2211P uses a surge-rated MOSFET as its primary protection element, activated by a precision trigger circuit that senses overvoltage events and drives the FET into low-R_DS(on) conduction. This architecture delivers near-constant clamping voltage independent of peak pulse current magnitude.

Its functional design targets unsymmetrical line protection with 22V working voltage, ±1kV IEC 61000-4-5 surge rating (RS = 42Ω), and stable performance across -40°C to +125°C ambient - validated by clamping voltage deviation <0.5V from -40°C to +125°C at 40A.

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. Exposed thermal pad not required; all pins must be soldered for full 40A surge capability.

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 22V working voltage, 40A surge rating, sub-28V clamping, and 1.6×1.6mm footprint - making it the only option capable of protecting 22V power rails in miniaturized industrial and USB-C PD systems without compromising surge margin or thermal stability.

Availability

TDS2211P is available at Aetrix Electronics and suitable for USB Type-C PD interfaces, industrial load switch inputs, and IoT device 22V power bus protection requiring stable component supply across long-lifecycle programs.

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 engineered specifically to replace conventional TVS diodes in high-reliability 20–36V power rail protection, delivering flat clamping via active FET shunting - targeting USB-C, industrial automation, and ruggedized computing applications.

FAQ

What is the primary protection function of the TDS2211P?

The TDS2211P functions as a transient diverting suppressor that actively shunts high-energy electrical overstress (EOS) events - including ESD, lightning-induced surges, and EFT - away from sensitive downstream components. Unlike passive TVS diodes, it uses a triggered FET to achieve near-constant 27.5–28V clamping across its full 40A surge range, making the TDS2211P especially effective for protecting 22V power rails in USB-C PD and industrial load switch applications.

Does the TDS2211P require a thermal pad on the PCB?

No, the TDS2211P does not require an exposed thermal pad. Its DFN 1.6×1.6mm package dissipates surge energy through its copper leads and internal FET structure, with no thermal pad specified in the official land pattern or datasheet. The device relies on low dynamic resistance (20mΩ) and efficient current sharing across all six pins - pins 1–3 (GND) and 4–6 (IN) - to handle 40A without thermal derating, and the datasheet explicitly states "no thermal pad is needed" under transient conditions.

Can the TDS2211P protect high-speed data lines like USB SuperSpeed?

No, the TDS2211P is not intended for high-speed data line protection due to its 175pF junction capacitance, which would severely degrade signal integrity on USB 3.x, PCIe, or DisplayPort lanes. It is designed exclusively for 22V power or low-speed control lines (e.g., USB-C CC, SBU, or load switch enable inputs). For SuperSpeed lanes, Semtech recommends pairing the TDS2211P with ultra-low-capacitance devices like RClamp3371ZC (<0.25pF), as documented in the official USB Type-C protection reference design.

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

The TDS2211P maintains a nearly constant 27.5–28V clamping voltage across its entire 1–40A peak pulse current range and from -40°C to +125°C, whereas standard TVS diodes exhibit linearly increasing clamping (V_C = V_BR + I_PP × R_DYN) due to fixed dynamic resistance. This fundamental difference arises because the TDS2211P uses a triggered FET with decreasing R_DS(on) under surge, while TVS diodes rely on fixed pn-junction characteristics - making the TDS2211P far more predictable for protecting 24V-rated ICs under real-world thermal and surge conditions.

Is the TDS2211P compliant with RoHS and halogen-free standards?

Yes, the TDS2211P is fully compliant with RoHS and WEEE directives and is halogen-free, as confirmed in the "Mechanical Characteristics" section of the official datasheet. It features lead-free terminal finish, UL 94V-0 flammability-rated molding compound, and Pb-free packaging - meeting environmental compliance requirements for industrial, computing, and consumer electronics markets without requiring exemptions or special handling.