Semtech Corporation JAN1N3647

Overview

JAN1N3647 from Semtech is a transient diverting suppressor (TDS) designed for high-energy EOS protection of 22V-rated 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 24–40A, 20mΩ dynamic resistance, and 175pF junction capacitance - deployed in USB Type-C PD input protection and industrial load switch front-end surge suppression.

For engineers reviewing the JAN1N3647 datasheet, pinout, applications, or equivalent options, this device offers stable clamping across temperature and current range, low ON-resistance FET-based shunting, DFN-6 compact footprint, and verified performance against IEC 61000-4-4/5/2 standards - critical for USB PD bus, IoT interface, and industrial equipment robustness validation.

Technical Context

The JAN1N3647 implements a precision-triggered, surge-rated MOSFET as its primary protection element, activated only during overvoltage events to minimize leakage and capacitance impact on signal integrity. Its trigger circuit initiates conduction when transient voltage exceeds ~25V breakdown, enabling sub-28V clamping independent of pulse amplitude.

Unlike conventional TVS diodes, JAN1N3647 maintains near-constant clamping voltage (27.5–28V) from 24A to 40A and across –40°C to +125°C due to decreasing R_DS(on) under surge, delivering superior thermal stability and predictable protection margin for 22V systems.

Key Specifications

Pinout & Package

Package: DFN-6 (1.6 mm × 1.6 mm × 0.55 mm), RoHS-compliant, Pb-free, UL 94V-0 molding compound, tape-and-reel packaging (3,000 pcs/reel).

Key Features

Applications

Equivalent & Alternatives

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

Compared with JAN1N3647, TDS2211P offers identical performance with enhanced manufacturing traceability, while SP3022-01ETG trades clamping precision and thermal stability for ultra-low capacitance - making JAN1N3647 the optimal choice for 22V power-line EOS protection where consistent low-voltage clamping is non-negotiable.

Availability

JAN1N3647 is available at Aetrix Electronics and suitable for USB Type-C PD interfaces, industrial load switch inputs, and IoT power rail protection requiring stable component supply, long-term lifecycle assurance, and compliance with IEC 61000-4-2/4/5 standards.

Supply support for JAN1N3647 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 semiconductor company specializing in high-performance analog and mixed-signal semiconductors for power management, protection, and signal integrity.

JAN1N3647 belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered specifically to replace conventional TVS diodes in high-reliability 22V power and interface protection applications demanding stable clamping and thermal resilience.

FAQ

What is the exact working voltage rating of JAN1N3647?

JAN1N3647 has a reverse stand-off voltage (V_RWM) of 22V, meaning it remains non-conductive under continuous DC voltages up to 22V. This rating is confirmed in the Semtech datasheet under Electrical Characteristics and defines the maximum nominal operating voltage of the protected line without triggering the device.

Does JAN1N3647 require external bias or control signals to operate?

No, JAN1N3647 operates autonomously without external bias, control pins, or configuration. It uses an integrated precision trigger circuit that activates the internal shunt FET only when transient voltage exceeds ~25V - making JAN1N3647 a true plug-and-play solution with zero quiescent current draw and no system integration overhead.

Can JAN1N3647 be used on high-speed data lines like USB SuperSpeed or PCIe?

No, JAN1N3647 is not suitable for high-speed data lines due to its 175pF junction capacitance, which would severely degrade signal integrity above ~100MHz. It is intended exclusively for power rails (e.g., VBUS, load switch inputs) and low-speed control lines (e.g., CC, SBU, enable signals) where capacitance is not a limiting factor.

How does JAN1N3647 differ from standard TVS diodes in clamping behavior?

JAN1N3647 uses a surge-rated MOSFET instead of a pn-junction, resulting in near-constant clamping voltage (27.5–28V) across 24–40A and –40°C to +125°C. In contrast, standard TVS diodes exhibit linear V_C = V_BR + I_PP × R_DYN, causing clamping to rise significantly with current and temperature - a key limitation JAN1N3647 eliminates.

What is the recommended PCB layout for optimal surge performance of JAN1N3647?

For optimal surge performance, all three IN pins (4,5,6) must be shorted together via a single low-inductance trace to the protected line, and all three GND pins (1,2,3) must connect directly to a solid ground plane using multiple vias. JAN1N3647 must be placed within 2 mm of the connector - per Semtech's layout guidelines - to minimize parasitic inductance and ensure effective transient diversion before coupling occurs.