Semtech Corporation SL15.TCT

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 bus protection and industrial load switch input stages.

For engineers reviewing the TDS2211P datasheet, pinout, applications, or equivalent options, key selection criteria include clamping stability across temperature and current, low dynamic resistance for flat VC response, DFN-6 package layout constraints, and compatibility with 22V working voltage systems requiring robust surge immunity per IEC 61000-4-5.

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 with stable 22V reverse stand-off voltage and <600nA leakage at VRWM; junction capacitance is 175pF at 22V/1MHz, making it suitable for DC-bus and medium-speed signal-line protection where low capacitance is not critical.

Key Specifications

Pinout & Package

Package: DFN-6 (1.6mm × 1.6mm × 0.55mm), Pb-free, RoHS-compliant, UL 94V-0 molding compound. Exposed thermal pad not required; all GND and IN pins must be connected for full 40A rating.

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 flat 27.5–28V clamping at 40A across –40°C to +125°C - enabling smaller safety margins, simplified thermal design, and guaranteed compliance with IEC 61000-4-5 Level 4 in compact industrial and USB PD systems.

Availability

TDS2211P is available at Aetrix Electronics and suitable for USB Type-C PD implementations, industrial load switch protection, and IoT power rail hardening requiring stable component supply and long-term lifecycle support.

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 semiconductors for power management, protection, and signal integrity.

The TDS family was developed to replace conventional TVS diodes in high-reliability industrial and interface applications where clamping voltage stability across temperature and current is critical to system robustness.

FAQ

What is the primary protection function of the TDS2211P?

The TDS2211P functions as a transient diverting suppressor that shunts high-energy electrical overstress (EOS) events-such as ESD, EFT, and lightning-induced surges-to ground using a precision-triggered FET. Unlike TVS diodes, it maintains a near-constant clamping voltage of 27.5–28V from 24A to 40A, ensuring predictable protection for 22V-rated systems like USB PD buses and industrial load switches. This behavior is intrinsic to the TDS2211P's architecture and verified across its full operating temperature range.

Can the TDS2211P be used on high-speed data lines like USB SuperSpeed differential pairs?

No, the TDS2211P is not suitable for USB SuperSpeed (TX/RX) or other high-speed differential data lines due to its 175pF junction capacitance at 22V, which would severely degrade signal integrity. It is intended for DC power rails (e.g., VBUS, load switch inputs) and low-speed control lines (CC, SBU). For SuperSpeed protection, Semtech recommends low-capacitance devices such as RClamp3371ZC (<0.25pF), as specified in the TDS2211P application note.

How should the TDS2211P be laid out on the PCB to ensure full 40A surge capability?

To achieve the rated 40A peak pulse current, all three IN pins (4, 5, 6) must be shorted together with a low-inductance trace directly to the protected line, and all three GND pins (1, 2, 3) must connect to a solid ground plane using ≥3 vias. The device must be placed within 5mm of the connector, with minimal trace length between IN pins and the protected node. Layout deviations - such as omitting a GND pin or routing IN pins separately - will reduce effective surge rating below 40A. These requirements are validated in the TDS2211P datasheet Figure 7.

Does the TDS2211P require a thermal pad or heatsink for surge dissipation?

No, the TDS2211P does not require an exposed thermal pad or external heatsink. Its FET-based architecture dissipates surge energy in the channel with negligible junction temperature rise during single-event transients. The datasheet explicitly states "no thermal pad is needed," and thermal performance is validated under worst-case 40A 8/20μs pulses at +125°C ambient. PCB copper area under the DFN body provides sufficient thermal mass for standard surge duty cycles.

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

Yes, the TDS2211P is certified Pb-free, halogen-free, and compliant with both RoHS and WEEE directives. Its molding compound meets UL 94V-0 flammability rating, and lead finish is fully lead-free. This compliance is documented in the "Mechanical Characteristics" section of the official Semtech TDS2211P datasheet Rev 2.5, and the device ships in tape-and-reel packaging (3,000 units per 7-inch reel) with T22 marking code.