Semtech Corporation JAN1N5551

Overview

JAN1N5551 from Semtech is a transient diverting suppressor (TDS) designed for high-energy EOS protection on 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 40A, 20mΩ dynamic resistance, and 175pF junction capacitance - deployed in USB Type-C PD input protection and industrial load switch front-end circuits.

For engineers reviewing the JAN1N5551 datasheet, pinout, applications, or equivalent options, this device offers stable clamping across temperature and current range - critical for protecting USB PD controllers, e-fuses, and 22V industrial bus interfaces where conventional TVS diodes exhibit rising clamping voltage with surge current or temperature.

Technical Context

The JAN1N5551 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 standard 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, maintains <600nA reverse leakage at 22V, and delivers 1120W peak pulse power (8/20μs). Its DFN 1.6×1.6×0.55mm package integrates three parallel input terminals (pins 4–6) and three ground terminals (pins 1–3) to minimize parasitic inductance and maximize surge current handling.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMAJ22A and TPD2E007DRYR, JAN1N5551 provides superior surge robustness and thermally stable clamping for 22V power rails, while occupying less than 10% of the PCB area of SMAJ22A and delivering 5.7× higher peak current than TPD2E007DRYR - making it the only option qualified for industrial 40A surge compliance in compact DFN form.

Availability

JAN1N5551 is available at Aetrix Electronics and suitable for USB Type-C PD designs, industrial load switch interfaces, and IoT power rail protection requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for JAN1N5551 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 high-performance analog and mixed-signal ICs for precision sensing, protection, and signal integrity.

JAN1N5551 belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered to replace conventional TVS diodes in high-reliability 22V power and interface protection applications where stable clamping and temperature resilience are mandatory.

FAQ

What is the maximum continuous operating voltage for JAN1N5551?

JAN1N5551 has a reverse stand-off voltage (V_RWM) of 22V, meaning it reliably blocks up to 22V DC or RMS without significant leakage current. Operation above this voltage risks premature conduction and accelerated wear. The device is specifically rated for 22V bus protection in USB PD and industrial power applications, and exceeding this voltage voids its specified clamping and surge performance.

Does JAN1N5551 require external bias or control signals to operate?

No, JAN1N5551 is a fully autonomous transient protection device with an integrated precision trigger circuit and shunt FET. It requires no external power, enable signals, or configuration. When a transient exceeds its breakdown threshold (~25–27.9V), the internal circuit activates the FET within nanoseconds - making JAN1N5551 a true plug-and-protect solution for 22V lines.

Can JAN1N5551 be used on high-speed data lines like USB SuperSpeed or PCIe?

No, JAN1N5551 is not suitable for high-speed data lines. Its 175pF junction capacitance would severely degrade signal integrity on differential pairs operating above ~100 Mbps. It is designed exclusively for 22V power rails and low-bandwidth control lines. For USB SS or DP/DM protection, Semtech recommends low-capacitance devices like RClamp3371ZC (<0.25pF), not JAN1N5551.

How does JAN1N5551's clamping performance compare to standard TVS diodes at high temperature?

Unlike standard TVS diodes whose clamping voltage rises significantly with temperature, JAN1N5551 maintains 27.5–28V clamping from –40°C to +125°C. This stability is achieved via its FET-based architecture - where clamping is governed by trigger circuit breakdown rather than junction characteristics. At 125°C, a typical 22V TVS may clamp above 38V, whereas JAN1N5551 stays within specification, ensuring consistent protection in thermally demanding environments.

What PCB layout practices are essential for optimal performance of JAN1N5551?

To achieve full 40A surge rating, all three GND pins (1–3) must connect directly to a solid ground plane using ≥3 vias each, and all three IN pins (4–6) must be tied together with a short, wide copper trace routed adjacent to the protected connector. JAN1N5551 must be placed within 5 mm of the entry point - longer traces add inductance that degrades ESD response and increases voltage overshoot during fast transients.