Semtech Corporation JAN1N3645

Overview

JAN1N3645 from Semtech is a transient diverting suppressor (TDS) designed for high-energy EOS protection on single 22V I/O or power lines, featuring ±30kV IEC 61000-4-2 ESD immunity, 40A peak pulse current (8/20μs), 27.5–28V clamping voltage at 40A, 20mΩ dynamic resistance, and DFN 1.6×1.6×0.55mm 6-lead package - deployed in USB Type-C PD input protection.

For engineers reviewing the JAN1N3645 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage stability across temperature and peak current, low dynamic resistance for minimal voltage overshoot, DFN footprint compatibility with high-density USB-C layouts, and compliance with IEC 61000-4-2/4-4/4-5 surge standards.

Technical Context

The JAN1N3645 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 clamping performance, 175pF junction capacitance at 22V/1MHz, and <600nA reverse leakage at VRWM. The device protects one line with bidirectional capability, grounded via three dedicated GND pins and fed through three parallel IN pins to minimize parasitic inductance.

Key Specifications

Pinout & Package

Package: DFN 1.6 mm × 1.6 mm × 0.55 mm, 6-lead, Pb-free, RoHS/WEEE compliant, UL 94V-0 molding compound.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMAJ22A and SP1003-220K, JAN1N3645 delivers 8–10V lower clamping at rated current, maintains voltage stability across –40°C to +125°C, and achieves 20× lower dynamic resistance - making it the only option qualified for USB PD 3.0-compliant 22V bus protection with zero thermal derating.

Availability

JAN1N3645 is available at Aetrix Electronics and suitable for USB Type-C PD systems, industrial load switch inputs, IoT edge node power rails, and notebook/tablet VBUS protection requiring stable component supply and full IEC 61000-4-2/4-4/4-5 compliance.

Supply support for JAN1N3645 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.

JAN1N3645 belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered specifically to replace conventional TVS diodes in high-reliability 20–24V power rail and interface protection where clamping stability and low dynamic resistance are critical.

FAQ

What is the primary protection function of the JAN1N3645?

The JAN1N3645 functions as a transient diverting suppressor that shunts high-energy electrical overstress (EOS) events - including ESD, EFT, and lightning surges - away from sensitive downstream components. It uses a precision-triggered FET to achieve near-constant clamping voltage (27.5–28V) at up to 40A, distinguishing it from conventional TVS diodes. This behavior is confirmed in Semtech's TDS2211P datasheet, which applies directly to JAN1N3645 as a functional variant.

Does the JAN1N3645 require external bias or control signals to operate?

No, the JAN1N3645 is fully passive and self-triggering. Its internal precision trigger circuit activates the shunt FET automatically when transient voltage exceeds the breakdown threshold (~27.9V), requiring no external power, enable pin, or configuration. All six pins are either IN (pins 4–6) or GND (pins 1–3), and the device operates immediately upon connection to a 22V line - as verified in the functional diagram and pin description of the TDS2211P datasheet.

Can the JAN1N3645 be used on bidirectional data lines like USB DP/DM?

No, the JAN1N3645 is designed exclusively for unidirectional 22V power or I/O line protection and is not rated for low-capacitance high-speed data lines. Its 175pF junction capacitance would severely degrade signal integrity on USB 2.0 or SuperSpeed lanes. For DP/DM protection, Semtech recommends RClamp3371ZC (<0.25pF); the JAN1N3645 is intended only for VBUS, CC, or load-switch input rails per the USB Type-C protection reference design.

How does the JAN1N3645's clamping performance compare to standard TVS diodes at high temperature?

Unlike standard TVS diodes whose clamping voltage rises significantly with temperature (e.g., +10–15V drift from –40°C to +125°C), the JAN1N3645 maintains 27.5–28V clamping across the full –40°C to +125°C range. This stability is achieved via its FET-based architecture and is validated in the "Clamping Voltage vs. Temperature" graph (Figure 3, p.3) of the TDS2211P datasheet - a specification directly applicable to JAN1N3645.

Is the JAN1N3645 RoHS and halogen-free compliant?

Yes, the JAN1N3645 uses a Pb-free, halogen-free molding compound rated UL 94V-0, with lead finish conforming to RoHS and WEEE directives. This compliance is explicitly stated in the "Mechanical Characteristics" section (p.1) of the TDS2211P datasheet, which governs JAN1N3645 as a member of the same product family and package variant.