Semtech Corporation 1N4249

Overview

TDS2211P from Semtech is a transient diverting suppressor designed to protect 22V-rated I/O or power lines against EOS, ESD, and surge events using a shunt FET architecture; it delivers ±30kV IEC 61000-4-2 ESD protection, 40A (8/20μs) peak pulse current handling, and stable 27.5–28V clamping across temperature and current range; used in USB Type-C PD bus protection.

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 industrial and USB PD input protection requirements.

Technical Context

The TDS2211P employs a precision-triggered, surge-rated FET as its primary protection element - not a conventional TVS diode - enabling near-constant clamping voltage independent of peak pulse current due to decreasing R_DS(on) under surge conditions. Its trigger circuit activates the FET when transient voltage exceeds ~27V breakdown.

Unlike standard TVS devices whose clamping voltage rises linearly with IPP (VC = VBR + IPP × RDYN), the TDS2211P maintains VC ≈27.6–28V from 24A to 40A and across –40°C to +125°C, with dynamic resistance of only 20mΩ and minimal temperature drift in breakdown voltage.

Key Specifications

Pinout & Package

Package: DFN-6 (1.6mm × 1.6mm × 0.55mm), RoHS-compliant, Pb-free, UL 94V-0 molding compound, 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 TPD2E007DRYR, the TDS2211P uniquely combines 40A surge handling, sub-28V clamping across temperature, and FET-based constant-voltage behavior - making it the only option among the three qualified for 22V industrial power rail and USB PD bus protection.

Availability

TDS2211P is available at Aetrix Electronics and suitable for USB Type-C PD interfaces, industrial load switch inputs, and IoT device 22V power rails requiring stable component supply, long-lifecycle support, and guaranteed surge performance.

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 power management, protection, and signal integrity.

The TDS product line was developed to replace conventional TVS diodes in high-reliability 22V–36V power rail protection, delivering stable clamping via active FET shunting rather than passive junction breakdown.

FAQ

What is the primary protection mechanism used in the TDS2211P?

The TDS2211P uses a precision-triggered, surge-rated FET as its core protection element - not a PN-junction TVS diode. When an EOS event exceeds the trigger circuit's breakdown voltage (~27V), the drive circuit turns on the shunt FET, creating a low-resistance path (<20mΩ) to ground. This architecture enables near-constant clamping voltage regardless of surge amplitude or temperature - a fundamental departure from conventional TVS behavior. The TDS2211P relies on this active shunt method to deliver its 27.5–28V clamping performance.

Can the TDS2211P be used on high-speed data lines such as USB 3.2 or PCIe?

No, the TDS2211P is not suitable for high-speed data lines. Its 175pF junction capacitance at 22V introduces excessive signal distortion and insertion loss for differential pairs operating above 100Mbps. It is engineered specifically for 22V power rail and I/O line protection - such as USB-C VBUS, load switch inputs, or industrial 24V auxiliary supplies - where low capacitance is not required. For data-line ESD protection, Semtech recommends low-capacitance devices like RClamp3371ZC (<0.25pF), not the TDS2211P.

How does the TDS2211P's clamping voltage compare to standard TVS diodes at elevated temperatures?

At 125°C, the TDS2211P maintains clamping voltage at ~27.6–28V across its full 40A surge range, with negligible drift. In contrast, a typical 22V TVS diode (e.g., SMAJ22A) exhibits significant thermal derating: its clamping voltage rises to ≥38V at 24A and 125°C due to positive temperature coefficient of dynamic resistance. This makes the TDS2211P uniquely reliable for industrial applications where ambient temperature and surge stress co-occur - a key advantage confirmed in Figure 3 of the official datasheet for TDS2211P.

Is the TDS2211P pin-compatible with other Semtech TDS devices like TDS3311P or TDS1211P?

No, the TDS2211P is not pin-compatible with TDS3311P or TDS1211P. While all three share the same DFN-6 (1.6×1.6mm) package outline and 3-GND / 3-IN pin configuration, their voltage ratings differ fundamentally: TDS1211P is rated for 12V VRWM, TDS3311P for 33V VRWM, and TDS2211P for 22V VRWM. Substituting them risks overvoltage failure (if lower-VRWM part is used) or insufficient protection (if higher-VRWM part is used). Each variant requires validation for its specific working voltage window - the TDS2211P is validated only for 22V systems.

What layout practices are critical to achieving full 40A surge performance with the TDS2211P?

To achieve rated 40A (8/20μs) performance, all three GND pins (1, 2, 3) and all three IN pins (4, 5, 6) must be connected - no stubs or daisy-chaining. Place the TDS2211P within 5mm of the protected connector, use short straight traces (not serpentine), and connect GND pins to a solid ground plane via ≥3 vias each. Avoid thermal pads: energy is dissipated in the silicon FET, not the package. These guidelines are specified in Figure 7 and Section 6 of the TDS2211P datasheet and are essential to minimize parasitic inductance that would otherwise raise clamping voltage during fast transients.