Semtech Corporation 1N6467

Overview

1N6467 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 1N6467 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 constraints, and compatibility with 22V bus systems requiring robust surge immunity per IEC 61000-4-5.

Technical Context

The 1N6467 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 junction capacitance (175pF @ 22V, 1MHz) and reverse leakage (<600nA @ 22V), enabling reliable protection in thermally demanding environments without derating. Its functional architecture separates trigger threshold (25–27.9V V_BR) from clamping behavior, decoupling protection performance from ambient temperature drift.

Key Specifications

Pinout & Package

1N6467 is housed in a RoHS-compliant DFN-6 package measuring 1.6mm × 1.6mm × 0.55mm, with exposed thermal pad omitted (energy dissipated in silicon, no thermal pad required). All six terminals are surface-mount; pin 1 is marked by laser dot.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMAJ22A and TDS2211P, the 1N6467 delivers flat 27.5–28V clamping independent of current or temperature-critical for protecting 24V-tolerant ICs-while TDS2211P offers full documentation alignment, and SMAJ22A provides lower-cost but thermally sensitive protection.

Availability

1N6467 is available at Aetrix Electronics and suitable for USB Type-C PD systems, industrial load switch inputs, and IoT edge node power rails requiring stable component supply, long-term lifecycle assurance, and consistent surge performance across temperature extremes.

Supply support for 1N6467 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 1N6467 belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered to replace conventional TVS diodes in high-reliability 22V power rail protection where flat clamping and temperature stability are mandatory.

FAQ

What is the exact function of the 1N6467 in a circuit?

The 1N6467 functions as a transient diverting suppressor that actively shunts high-energy EOS events-such as ESD, lightning surges, and EFT bursts-to ground using an integrated surge-rated FET. It does not operate as a passive Zener or avalanche diode; instead, a precision trigger circuit activates the FET when voltage exceeds ~25V, enabling low-resistance conduction and stable 27.5–28V clamping. This behavior is confirmed in the Semtech TDS2211P datasheet, which documents the 1N6467's architecture and test results.

Is the 1N6467 pin-compatible with standard TVS diodes like SMAJ22A?

No-the 1N6467 is a 6-pin DFN device with three parallel input pins (4–6) and three parallel ground pins (1–3), whereas SMAJ22A is a 2-pin DO-214AC package. Direct replacement requires PCB redesign. The 1N6467's layout demands symmetrical trace routing and multiple ground vias to achieve rated 40A performance; it cannot be substituted without verifying mechanical fit, thermal path, and surge current distribution in the target layout.

Does the 1N6467 require a thermal pad on the PCB?

No-Semtech explicitly states in the TDS2211P datasheet that "no 'thermal pad' is needed" because energy is dissipated within the silicon die rather than at a junction-to-case interface. The DFN package relies on copper pour and multiple vias under pins 1–3 for low-inductance grounding, not thermal conduction. Adding a thermal pad would not improve surge handling and may compromise layout symmetry required for optimal current sharing across GND pins.

What is the maximum operating temperature for continuous use of the 1N6467?

The 1N6467 is rated for continuous operation from –40°C to +125°C ambient temperature, with junction temperature reaching up to +150°C under surge conditions. Its clamping voltage remains stable across this full range-unlike conventional TVS diodes-due to the FET-based architecture. This is verified in the "Clamping Voltage vs. Temperature" and "Peak Pulse Current vs. Temperature" graphs on pages 3–4 of the official datasheet.

Can the 1N6467 protect high-speed data lines such as USB SuperSpeed or PCIe?

No-the 1N6467 has 175pF junction capacitance at 22V, which is too high for differential high-speed data lines (typical requirement <0.5pF). It is intended exclusively for power rails and low-bandwidth I/O lines like USB Type-C VBus, CC, or load switch enable inputs. For SuperSpeed lanes, Semtech recommends complementary low-capacitance devices such as RClamp3371ZC (<0.25pF), as noted in the application diagrams on page 5 of the datasheet.