Semtech Corporation 1N6466US

Overview

1N6466US from Semtech is a transient diverting suppressor (TDS) designed for high-energy EOS protection of 22V-rated power or I/O lines, featuring ±30kV IEC 61000-4-2 ESD immunity, 40A peak pulse current (8/20μs), 27.5–28V clamping voltage at 24–40A, and 20mΩ dynamic resistance. It protects USB PD, Type-C VBus, and load switch inputs in industrial and portable electronics.

For engineers reviewing the 1N6466US datasheet, pinout, applications, or equivalent options, key selection criteria include clamping stability across temperature and current, low dynamic resistance for flat voltage response, DFN-6 package layout compatibility, and compliance with IEC 61000-4-2/4-4/4-5 surge standards.

Technical Context

The 1N6466US employs 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-across 24–40A and −40°C to +125°C due to decreasing R_DS(on) under surge conditions.

It operates with a 22V reverse stand-off voltage (V_RWM) and 25–27.9V breakdown (V_BR at 1mA), delivers 1120W peak pulse power, and exhibits only 175pF junction capacitance at 22V/1MHz-enabling use on high-speed power rails without signal integrity degradation.

Key Specifications

Pinout & Package

1N6466US is housed in a RoHS-compliant, halogen-free DFN-6 package measuring 1.6mm × 1.6mm × 0.55mm with UL 94V-0 molding compound. All six terminals are surface-mount; no thermal pad required.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TDS2211P and uClamp2411ZA, the 1N6466US delivers identical high-current, constant-clamp performance in the same DFN-6 package but may differ in marking, reel packaging, or qualification batch-making it suitable for drop-in replacement where TDS2211P is unavailable, while uClamp2411ZA serves distinctly lower-energy signal-line roles.

Availability

1N6466US is available at Aetrix Electronics and suitable for USB Type-C PD systems, industrial load switch inputs, notebook 22V rails, and enterprise storage power lines requiring stable component supply, long-term lifecycle support, and guaranteed RoHS/REACH compliance.

Supply support for 1N6466US 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 1N6466US belongs to Semtech's Transient Diverting Suppressor (TDS) product line-engineered to replace conventional TVS diodes with FET-based clamping for flat-voltage, high-energy EOS protection in next-generation power interfaces.

FAQ

What is the primary protection function of the 1N6466US?

The 1N6466US functions as a transient diverting suppressor that shunts high-energy EOS events-including ESD, EFT, and lightning surges-to ground using an integrated surge-rated FET. Its core purpose is to clamp voltage on 22V-rated power or I/O lines to a stable 27.5–28V level during transients up to 40A, preventing damage to downstream ICs like USB PD controllers or load switches. Unlike TVS diodes, the 1N6466US achieves this via active triggering rather than passive avalanche conduction.

Does the 1N6466US require external bias or control signals to operate?

No, the 1N6466US is fully autonomous and requires no external bias, enable pins, or control logic. It operates passively: the internal trigger circuit senses overvoltage on the IN pins relative to GND and activates the shunt FET within nanoseconds. All six pins are either input (pins 4–6) or ground (pins 1–3); no additional components or configuration are needed for basic surge suppression functionality of the 1N6466US.

How does the 1N6466US differ from standard TVS diodes in clamping behavior?

The 1N6466US maintains a nearly constant clamping voltage of 27.5–28V across its full 24–40A surge range and −40°C to +125°C operating temperature, whereas standard TVS diodes exhibit linearly increasing clamping (V_C = V_BR + I_PP × R_DYN) due to fixed dynamic resistance. This flat response in the 1N6466US results from decreasing FET R_DS(on) under surge, enabling tighter voltage margins for sensitive 22V-rated ICs without thermal or current derating.

Can the 1N6466US be used on high-speed data lines like USB SuperSpeed or PCIe?

No-the 1N6466US is not intended for high-speed data lines. With 175pF junction capacitance, it is optimized for power rail and low-frequency I/O protection (e.g., VBus, CC, SBU, or load switch inputs), not signal integrity-critical paths. For USB SS, DP/DM, or PCIe lanes, Semtech recommends ultra-low-capacitance devices like RClamp3371ZC (<0.25pF). Using the 1N6466US on such lines would severely degrade signal rise/fall times and cause bit errors.

What PCB layout practices are critical for optimal 1N6466US performance?

To achieve rated 40A surge capability, all three GND pins (1–3) and all three IN pins (4–6) must be connected-no stubs or daisy-chaining. Place the 1N6466US within 2mm of the protected connector, use short straight traces, and connect GND pins to a solid ground plane via ≥3 vias each. Avoid thermal relief on GND pads; minimize trace inductance to preserve clamping speed and prevent voltage overshoot during fast ESD events affecting the 1N6466US.