Vishay Siliconix 2N6661JTXL02

Overview

2N6661JTXL02 from Vishay Siliconix is a military-qualified N-channel enhancement-mode MOSFET with 90 V drain-source rating, 3.6 Ω R_DS(on) at V_GS = 10 V, and 1.6 V gate threshold voltage. It operates in hi-rel systems requiring direct TTL/CMOS logic-level drive and low-leakage switching of relays, solenoids, and solid-state relays.

For engineers reviewing the 2N6661JTXL02 datasheet, 2N6661JTXL02 pinout, 2N6661JTXL02 application, or 2N6661JTXL02 equivalent, key selection criteria include its TO-205AD (TO-39) package, PIND-tested qualification, 6 ns turn-on time, and guaranteed operation from –55 °C to +150 °C junction temperature.

Technical Context

This device is a single N-channel silicon MOSFET optimized for low-voltage gate drive and high-reliability switching. Its 1.6 V typical V_GS(th) enables direct interface with 3.3 V and 5 V logic families, while its 35 pF input capacitance and 6 ns t_ON support fast digital control in pulse-width modulated loads.

The drain is internally connected to the metal case per TO-205AD mechanical specification, requiring electrical isolation of the mounting surface. Thermal resistance from junction-to-case is 20 °C/W, enabling 6.25 W continuous dissipation at T_C = 25 °C without forced cooling.

Key Specifications

Pinout & Package

2N6661JTXL02 is housed in a hermetically sealed TO-205AD (TO-39 tall lid) metal can package with case-connected drain. The package provides robust thermal conduction (R_thJC = 20 °C/W) and meets MIL-PRF-19500 requirements for high-reliability discrete semiconductors.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar N-channel MOSFET switching applications.

Compared with 2N6661JTXL02, the 2N6660JTXL02 offers identical reliability screening but reduced voltage headroom, while the 2N7000-TP sacrifices all military qualification for lower cost and smaller footprint - neither is a drop-in replacement due to voltage, thermal, or compliance gaps.

Availability

2N6661JTXL02 is available at Aetrix Electronics and suitable for aerospace actuation control, military data acquisition systems, and hi-rel solid-state relays requiring stable component supply across long-lifecycle defense and space programs.

Supply support for 2N6661JTXL02 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

Vishay Siliconix designs and manufactures high-performance discrete semiconductors including MOSFETs, diodes, and optoelectronics, with emphasis on reliability, precision, and ruggedized packaging.

The 2N6661 family belongs to Vishay's military-qualified discrete MOSFET product line, engineered specifically for high-reliability switching in aerospace, defense, and industrial control systems where failure is not an option.

FAQ

What does the "JTXL02" suffix indicate in 2N6661JTXL02?

The "JTXL02" suffix identifies this as a JANTX-qualified version of the 2N6661 with PIND (Particle Impact Noise Detection) screening and solder-plated leads. Per Vishay's ordering table, JTXL02 corresponds to JANTX2N6661P - confirming full MIL-PRF-19500 compliance, including burn-in, temperature cycling, and hermeticity testing. This makes 2N6661JTXL02 suitable for Class S space applications and critical avionics.

Is the drain terminal of 2N6661JTXL02 electrically connected to the case?

Yes, the drain terminal of 2N6661JTXL02 is internally bonded to the metal case, as confirmed by the TO-205AD mechanical drawing and the "Drain is electrically connected to the case" note in the Vishay package document. This requires the mounting surface to be electrically isolated unless the system architecture intentionally uses the case as the drain return path - a key layout consideration for thermal and safety compliance.

What is the maximum continuous drain current for 2N6661JTXL02 at 100 °C case temperature?

The maximum continuous drain current for 2N6661JTXL02 is 0.54 A at T_C = 100 °C, as specified in the Absolute Maximum Ratings table. This derating from 0.86 A at 25 °C reflects thermal limitations of the TO-205AD package and must be respected in convection-cooled or thermally constrained enclosures to avoid exceeding the 150 °C maximum junction temperature.

Does 2N6661JTXL02 support logic-level gate drive from 3.3 V microcontrollers?

Yes, 2N6661JTXL02 supports logic-level gate drive from 3.3 V sources: its gate threshold voltage V_GS(th) ranges from 0.8 V to 2.0 V (typical 1.6 V), and it delivers usable on-state current (I_D(on) = 1.8 mA) even at V_GS = 5 V. While full R_DS(on) performance requires ≥10 V, 3.3 V drive achieves partial enhancement sufficient for low-current switching in indicator and control circuits.

How does the PIND test affect the reliability assurance of 2N6661JTXL02?

The PIND test in 2N6661JTXL02 detects loose conductive particles inside the hermetic TO-205AD package that could cause intermittent shorts under vibration or acceleration. As a mandatory screen for JANTX-qualified parts, PIND significantly improves long-term reliability in high-G environments such as missile guidance systems and launch vehicle avionics - a requirement not met by commercial equivalents like the 2N7000-TP.