Microchip Technology 1N5663

Overview

1N5663 from Microchip (formerly Microsemi) is a unidirectional transient voltage suppressor (TVS) diode in a hermetically sealed DO-13 metal package, designed for high-energy surge protection in aerospace, avionics, and industrial systems. It delivers 1500 W peak pulse power at 10/1000 µs, clamps transients below 244 V at 6.2 A peak pulse current, and operates across –55°C to +175°C with a 138 V rated standoff voltage (VWM).

For engineers reviewing the 1N5663 datasheet, 1N5663 pinout, 1N5663 application, or 1N5663 equivalent, this device is selected for secondary lightning protection per IEC61000-4-5 (Class 2, 42 Ω source), ESD/EFT immunity per IEC61000-4-2/–4-4, and fast-clamping (<100 ps) protection of DC power rails and signal lines in harsh environments.

Technical Context

The 1N5663 functions as a unidirectional avalanche diode that remains nonconductive below its 138 V standoff voltage (VWM) and enters controlled avalanche breakdown above its 153 V minimum breakdown voltage (V(BR)) at 1 mA. Its clamping voltage (VC = 244 V @ IPP = 6.2 A) ensures predictable overvoltage limiting during transient events.

It leverages a hermetic DO-13 (DO-202AA) metal-glass package with cathode-to-case polarity, enabling reliable operation at junction temperatures up to +175°C and thermal resistance of 50°C/W (junction-to-lead). Its <100 ps response time and radiation-hardened construction support mission-critical avionics and defense applications.

Key Specifications

Pinout & Package

DO-13 (DO-202AA) hermetically sealed metal-glass package with axial leads; cathode terminal electrically bonded to case and marked by diode symbol on body.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar unidirectional TVS diode applications.

Compared with 1N5663, the 1N5663A offers identical electrical performance with enhanced process control and military qualification, while SMCJ130A trades hermetic reliability and radiation hardness for surface-mount scalability and thermal efficiency in non-mission-critical systems.

Availability

1N5663 is available at Aetrix Electronics and suitable for aerospace power distribution, industrial motor drive controls, avionics data bus interfaces, and military vehicle power systems requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for 1N5663 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

Microchip Technology acquired Microsemi in 2018 and maintains its high-reliability analog and discrete portfolio, including radiation-hardened and military-qualified components for aerospace, defense, and industrial markets.

The 1N5663 belongs to Microchip's legacy TVS diode family originally developed by Microsemi for extreme-environment transient suppression; it targets applications demanding hermetic sealing, wide temperature operation, and proven field reliability in safety-critical systems.

FAQ

What is the standoff voltage (VWM) of the 1N5663 and how does it relate to system design?

The 1N5663 has a rated standoff voltage (VWM) of 138 V, meaning it remains nonconductive up to this reverse voltage under normal operation. This value must be ≥ the maximum continuous DC or peak AC voltage in the protected circuit-e.g., it suits 120 VAC-derived 130–140 VDC rails. Exceeding VWM risks leakage or premature breakdown, so designers verify operating margins using the 1N5663's 153 V minimum breakdown voltage and thermal derating curves.

Does the 1N5663 meet IEC61000-4-5 Class 2 surge requirements?

Yes, the 1N5663 is explicitly designated for IEC61000-4-5 Class 2 secondary lightning protection with a 42 Ω source impedance, as confirmed in the datasheet's Applications/Benefits section. Its 1500 W peak pulse power rating and 244 V clamping voltage at 6.2 A ensure compliance when correctly mounted with low-inductance grounding to handle the specified 10/1000 µs waveform without exceeding protected circuit limits.

Is the 1N5663 pin-compatible with other DO-13 TVS diodes like the 1N5662 or 1N5664?

The 1N5663 shares the DO-13 (DO-202AA) package and axial lead configuration with 1N5662 and 1N5664, but its electrical parameters differ: VWM is 138 V (vs. 130 V for 1N5662, 146 V for 1N5664), and VC is 244 V (vs. 230 V and 258 V respectively). While mechanical mounting is identical, substitution requires verification of system voltage margins and clamping headroom-1N5663 is not a drop-in replacement without circuit analysis.

What is the thermal resistance specification for the 1N5663 and how does it affect layout?

The 1N5663 has a junction-to-lead thermal resistance of 50°C/W when measured at 10 mm from the case, and 110°C/W junction-to-ambient on FR4 with 4 mm² copper pads. To maintain reliability, PCB layout must provide adequate copper area and short, wide traces to the cathode (case) connection-especially critical in high-temperature environments like engine compartments where sustained power dissipation must stay below 1 W per derating curves.

Can the 1N5663 be used for ESD protection per IEC61000-4-2?

Yes, the 1N5663 is explicitly cited for ESD protection per IEC61000-4-2 due to its <100 ps response time and low dynamic impedance. Its 244 V clamping voltage at 6.2 A provides robust protection for circuits with 250 V absolute maximum ratings. However, for low-voltage data lines (e.g., USB, RS-485), lower-VWM TVS devices are preferred-the 1N5663 is best suited for higher-voltage rails such as 28 V, 48 V, or 115 VAC-derived DC systems.