Semtech Corporation 1N4248

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 40A peak pulse current (8/20μs), clamps at 27.5–28V up to 40A, and maintains stable clamping across −40°C to +125°C - deployed in USB Type-C PD bus protection.

For engineers reviewing the TDS2211P datasheet, pinout, applications, or equivalent options, key selection criteria include its constant-clamp behavior under high IPP, low dynamic resistance (20 mΩ), 175 pF junction capacitance at 22V, DFN 1.6×1.6mm 6-lead package, and compatibility with industrial surge standards (±1kV, RS = 42Ω).

Technical Context

The TDS2211P uses a precision-triggered surge-rated FET as its primary protection element, activated when transient voltage exceeds the trigger circuit's breakdown threshold; this enables near-constant clamping voltage independent of peak pulse current magnitude due to the FET's collapsing R_DS(on).

Unlike conventional TVS diodes, its clamping voltage remains stable across temperature (−40°C to +125°C) and peak pulse current (24A–40A), with dynamic resistance specified at 20 mΩ (measured between 1A and 40A, 8/20μs), and junction capacitance held to 175 pF at 22V/1MHz.

Key Specifications

Pinout & Package

Package: DFN 1.6 mm × 1.6 mm × 0.55 mm, 6-lead, RoHS-compliant, UL 94V-0 molding compound, lead-free finish. Thermal pad not required; energy dissipated in silicon.

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 combines 40A surge rating, temperature-invariant clamping, and 20 mΩ dynamic resistance - making it the only option qualified for industrial 22V bus protection requiring sustained high-energy diversion without voltage drift.

Availability

TDS2211P is available at Aetrix Electronics and suitable for USB Type-C PD designs, industrial load switch interfaces, and IoT power rail protection requiring stable component supply, long-term lifecycle assurance, and 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 analog and mixed-signal ICs for precision sensing, protection, and signal integrity.

The TDS family was engineered to replace conventional TVS diodes in high-reliability 22V–36V systems where clamping stability, surge endurance, and temperature insensitivity are critical - targeting USB PD, industrial automation, and ruggedized edge computing.

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 DC without significant leakage or conduction. This makes the TDS2211P suitable for protecting 22V nominal power rails such as USB PD VBUS, industrial 24V auxiliary supplies, and load switch inputs - provided transient events do not exceed its clamping and surge ratings.

How does the TDS2211P achieve constant clamping voltage across varying surge currents?

The TDS2211P achieves constant clamping by using a precision-triggered shunt FET instead of a PN-junction diode. When an EOS event occurs, the trigger circuit activates the FET, whose R_DS(on) drops sharply with increasing current - resulting in a clamping voltage dominated by the trigger circuit's breakdown (~27.5 V), not I × R_DYN. This mechanism ensures TDS2211P clamps at 27.5–28 V from 24A to 40A, unlike TVS diodes whose V_C rises linearly with current.

Can the TDS2211P be used to protect high-speed data lines like USB 3.2 or PCIe?

No, the TDS2211P is not suitable for high-speed data lines. Its 175 pF junction capacitance at 22V is too high for signal integrity on interfaces exceeding USB 2.0 speeds (480 Mbps). It is intended for power rails and low-speed control lines (e.g., load switch EN, CC lines, VBUS monitoring). For superspeed lanes, Semtech recommends low-capacitance devices like RClamp3371ZC (<0.25 pF), not the TDS2211P.

What is the recommended PCB layout for optimal surge performance of the TDS2211P?

For optimal surge performance, place the TDS2211P as close as possible to the protected connector. Connect all three IN pins (4, 5, 6) together with a short, wide trace, and tie all three GND pins (1, 2, 3) directly to a solid ground plane using multiple vias. Avoid stubs or narrow traces - parasitic inductance degrades clamping response. No thermal pad is needed; energy is dissipated in the silicon die, not the package.

Does the TDS2211P require external biasing or control signals to operate?

No, the TDS2211P is fully passive and requires no external bias, control signals, or configuration. It operates autonomously: the internal trigger circuit senses overvoltage conditions and activates the shunt FET within nanoseconds. The device draws zero quiescent current in normal operation and imposes no loading on the protected line - making TDS2211P ideal for always-on, low-power industrial and battery-backed systems.