Semtech Corporation GS2974ACTE3

Overview

GS2974ACTE3 from Semtech is a Transient Diverting Suppressor (TDS) designed for high-energy EOS protection of 22V-rated power or I/O lines. It delivers ±30kV IEC 61000-4-2 ESD immunity, 40A peak pulse current (8/20μs), and a stable 27.5–28V clamping voltage across temperature and current range. It protects USB Type-C VBus, load switch inputs, and industrial power rails.

For engineers reviewing the GS2974ACTE3 datasheet, pinout, applications, or equivalent options, this page provides verified electrical parameters, DFN-6 package layout guidance, real-world clamping behavior vs. conventional TVS, and validated alternatives for 22V bus protection in USB PD and IoT systems.

Technical Context

The GS2974ACTE3 uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit when transient voltage exceeds breakdown. Unlike standard TVS diodes, its clamping voltage remains nearly constant-27.5–28V at 24A and 40A-due to the FET's ultra-low dynamic resistance (20 mΩ) and decreasing R_DS(on) under surge.

It operates from −40°C to +125°C with <600 nA reverse leakage at 22V, 175 pF junction capacitance at 22V/1MHz, and supports unsymmetrical line surge testing per IEC 61000-4-5 (±1kV, 1.2/50μs, R_S = 42Ω). Its functional architecture enables stable protection without thermal derating penalties typical of junction-based TVS devices.

Key Specifications

Pinout & Package

GS2974ACTE3 is housed in a RoHS-compliant, halogen-free DFN package measuring 1.6 mm × 1.6 mm × 0.55 mm with six terminals. All pins must be connected-three GND pins (1–3) and three IN pins (4–6)-to achieve rated 40A surge performance and minimize parasitic inductance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar transient suppression applications.

Compared with TDS2211P, GS2974ACTE3 offers identical protection performance and mechanical compatibility but reflects Semtech's updated tape-and-reel packaging designation; versus uClamp2411ZA, it provides 67% higher surge current handling and 5V lower clamping-making it the sole viable option for 22V bus-level protection.

Availability

GS2974ACTE3 is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch inputs, and IoT edge node power rails requiring stable component supply, long-term lifecycle support, and traceable RoHS-compliant sourcing.

Supply support for GS2974ACTE3 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 connectivity.

The GS2974ACTE3 belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered to replace traditional TVS diodes in high-reliability 22V power rail protection where stable clamping and temperature-invariant surge performance are mandatory.

FAQ

What is the exact function of GS2974ACTE3 in a circuit?

GS2974ACTE3 functions as a solid-state transient diverting suppressor that activates a precision-triggered shunt FET during EOS events. When voltage exceeds ~25V, the internal trigger circuit turns on the FET, routing surge current to ground while clamping the protected line to 27.5–28V. This prevents overvoltage damage to downstream components like USB PD controllers or load switches. GS2974ACTE3 does not regulate or switch power-it acts solely as a high-speed, low-impedance fault path.

Is GS2974ACTE3 pin-compatible with standard TVS diodes in DFN-6 packages?

No-GS2974ACTE3 is not pin-compatible with conventional TVS diodes. It uses a 3-pin input (pins 4–6) and 3-pin ground (pins 1–3) configuration optimized for parallel current sharing and low-inductance grounding. Standard unidirectional TVS in DFN-6 typically use anode/cathode/GND or bidirectional center-tap layouts. Substituting GS2974ACTE3 for a TVS requires PCB layout revision to accommodate its symmetrical 3×GND / 3×IN topology.

Does GS2974ACTE3 require external bias or control signals to operate?

No-GS2974ACTE3 is fully autonomous and requires no external bias, enable signals, or configuration. It operates passively: the internal trigger circuit monitors voltage across pins 4–6 and 1–3, and automatically activates the shunt FET when transient conditions exceed its breakdown threshold (~25V). No external components, timing circuits, or firmware interaction are needed for basic protection functionality.

Can GS2974ACTE3 be used on high-speed data lines like USB SuperSpeed or PCIe?

No-GS2974ACTE3 is not suitable for high-speed data lines. Its 175 pF junction capacitance at 22V would severely degrade signal integrity on differential pairs operating above ~100 Mbps. It is intended exclusively for DC power rails (e.g., VBus, load switch VIN) and low-speed control lines (CC, SBU, enable). For USB SS or DP/DM protection, Semtech recommends low-capacitance devices like RClamp3371ZC (<0.25 pF).

What is the maximum continuous power dissipation rating for GS2974ACTE3?

GS2974ACTE3 is not rated for continuous power dissipation-it is designed for transient-only operation. Its Absolute Maximum Rating specifies 1120 W peak pulse power (8/20μs), but steady-state power handling is limited by thermal resistance and ambient conditions. Under normal operation (22V, <1 μA leakage), power dissipation is negligible (<23 μW). Continuous overvoltage beyond VRWM will cause thermal runaway; it must only be used within its 22V working voltage limit and never subjected to sustained overvoltage.