Semtech Corporation JANTX1N3645.TR

Overview

JANTX1N3645.TR 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 40A, and ultra-low 20mΩ dynamic resistance - deployed in USB Type-C PD input protection and industrial load switch front-end circuits.

For engineers reviewing the JANTX1N3645.TR datasheet, pinout, applications, or equivalent options, key selection criteria include clamping stability across temperature (-40°C to +125°C), DFN-6 package footprint compatibility, 22V working voltage alignment with USB PD bus rails, and FET-based shunt architecture versus conventional TVS diodes.

Technical Context

The JANTX1N3645.TR implements a precision-triggered surge-rated FET as its primary protection element, activated by an internal reference circuit when transient voltage exceeds breakdown threshold. Unlike conventional TVS diodes, it maintains near-constant clamping voltage due to decreasing R_DS(on) under increasing surge current.

Its functional architecture separates trigger detection (V_BR ≈ 27.9V typ.) from low-impedance shunt conduction (R_DYN = 20mΩ), enabling stable 27.5–28V clamping across 24–40A IPP and -40°C to +125°C operating range - critical for protecting sensitive 22V-tolerant PD controllers and load switches.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with TDS2211P.C, JANTX1N3645.TR adds military qualification without electrical trade-offs; compared with SP3022-01FTG, it delivers superior clamping stability and surge energy handling but higher capacitance - making it optimal for 22V power-line EOS protection where voltage margin is constrained.

Availability

JANTX1N3645.TR is available at Aetrix Electronics and suitable for USB Type-C PD designs, industrial load switch protection, and 22V power rail surge mitigation requiring stable component supply across extended temperature and long-lifecycle programs.

Supply support for JANTX1N3645.TR 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.

JANTX1N3645.TR belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered specifically to replace conventional TVS diodes in high-reliability 22V power-line protection applications demanding stable clamping across temperature and current extremes.

FAQ

What is the primary protection function of the JANTX1N3645.TR?

The JANTX1N3645.TR functions as a transient diverting suppressor that shunts high-energy electrical overstress (EOS) events - including ESD, EFT, and lightning-induced surges - away from sensitive downstream components. It uses a precision-triggered FET to achieve stable 27.5–28V clamping at up to 40A, distinguishing it from conventional TVS diodes whose clamping rises with current and temperature. This behavior makes JANTX1N3645.TR especially effective on 22V power rails like USB PD VBUS.

How does the JANTX1N3645.TR differ from standard TVS diodes in clamping performance?

Unlike standard TVS diodes - whose clamping voltage increases linearly with peak pulse current (VC = VBR + IPP × RDYN) and rises significantly with temperature - the JANTX1N3645.TR maintains nearly constant 27.5–28V clamping across its full 24–40A rating and -40°C to +125°C operating range. This results from its FET-based architecture, where R_DS(on) decreases under surge, counteracting voltage rise. The JANTX1N3645.TR thus provides predictable, temperature-insensitive protection where TVS devices would exceed safe voltage thresholds.

What is the correct PCB layout practice for the JANTX1N3645.TR?

For optimal surge performance, all three GND pins (1, 2, 3) and all three IN pins (4, 5, 6) of the JANTX1N3645.TR must be shorted together respectively using wide, low-inductance copper traces. Place the device within 5mm of the protected connector, connect GND pins directly to a solid ground plane via ≥3 vias each, and avoid stubs or routing gaps between pins. This minimizes parasitic inductance, ensuring full 40A current sharing and preserving the specified clamping voltage during fast-rising transients.

Is the JANTX1N3645.TR suitable for protecting high-speed data lines such as USB SuperSpeed or PCIe?

No, the JANTX1N3645.TR is not suitable for high-speed data lines. Its 175pF junction capacitance at 22V would severely degrade signal integrity on differential pairs operating above ~100MHz. It is expressly designed for DC or low-frequency power-line and control-line protection - such as USB PD VBUS, load switch inputs, or 22V industrial rails. For USB SS, DP/DM, or PCIe lanes, use low-capacitance ESD arrays like Semtech RClamp3371ZC (<0.25pF) instead of JANTX1N3645.TR.

What does the "JANTX" prefix indicate for the JANTX1N3645.TR?

The "JANTX" prefix certifies that the JANTX1N3645.TR is manufactured and tested to MIL-PRF-19500/560 requirements, including extended temperature validation (-55°C to +150°C), burn-in, lot traceability, and rigorous screening for aerospace and defense applications. While electrically identical to the commercial TDS2211P.C, JANTX1N3645.TR undergoes additional quality and reliability testing - making it appropriate for mission-critical systems where component pedigree and long-term availability are mandated.