Microchip Technology 1N5652A

Overview

1N5652A from Microchip Technology 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 features a 50.2 V rated standoff voltage (VWM), 58.9 V minimum breakdown voltage (V(BR)), 85.0 V maximum clamping voltage (VC) at 17.7 A peak pulse current (IPP), and 1500 W peak pulse power rating at 10/1000 µs waveform.

For engineers reviewing the 1N5652A datasheet, 1N5652A pinout, 1N5652A application, or 1N5652A equivalent, this device is selected for IEC 61000-4-2 ESD, IEC 61000-4-4 EFT, and secondary lightning protection per IEC 61000-4-5 with 2–42 Ω source impedance - especially where radiation hardness, fast response (<100 ps), and military-grade reliability are required.

Technical Context

The 1N5652A operates as a unidirectional avalanche diode, entering controlled breakdown above its 50.2 V standoff voltage to clamp transients while maintaining low leakage (<5 µA at VWM). Its hermetic DO-13 package ensures stable performance across -55°C to +175°C operating temperature range and inherent radiation hardness per MicroNote 050.

It delivers 1500 W peak pulse power handling with <100 ps response time, enabling protection against fast-rising inductive switching spikes, RF-induced surges, and secondary lightning events. The cathode-is-case polarity and tin-lead plating support reliable through-hole soldering per MIL-STD-750 Method 2026.

Key Specifications

Pinout & Package

Package: DO-13 (DO-202AA), hermetically sealed metal-glass case with cathode connected to case and polarity marked by diode symbol. Tin-lead plated leads, weight ≈1.4 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N5652 and SMBJ53A, the 1N5652A uniquely combines hermetic DO-13 packaging, JANTXV qualification, -55°C to +175°C operation, and proven radiation tolerance - making it irreplaceable in avionics, missile guidance, and nuclear instrumentation where reliability under extreme stress is non-negotiable.

Availability

1N5652A is available at Aetrix Electronics and suitable for avionics power bus protection, industrial motor drive control inputs, ground vehicle ECUs, and radiation-hardened test equipment requiring stable component supply across extended temperature and radiation environments.

Supply support for 1N5652A 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 is a global semiconductor company specializing in microcontrollers, analog devices, and high-reliability discrete components for aerospace, defense, and industrial markets.

The 1N5652A belongs to Microchip's legacy TVS diode family designed specifically for mission-critical transient suppression in military, avionics, and harsh-environment applications where hermeticity, radiation tolerance, and wide temperature operation are essential.

FAQ

What is the standoff voltage (VWM) of the 1N5652A and how does it relate to system design?

The 1N5652A has a rated standoff voltage (VWM) of 50.2 V, meaning it remains nonconductive up to this reverse DC or peak AC voltage. In system design, VWM must exceed the maximum normal operating voltage - for example, selecting 1N5652A for a 28 V avionics bus provides ~78% headroom above nominal, ensuring no leakage or false triggering during transients below clamping threshold.

Does the 1N5652A meet IEC 61000-4-5 for secondary lightning protection?

Yes, the 1N5652A is validated for secondary lightning protection per IEC 61000-4-5 across multiple classes: Class 1–4 with 42 Ω source impedance, Class 1–3 with 12 Ω, and Class 2–3 with 2 Ω. Its 1500 W peak pulse power and 85.0 V clamping voltage ensure compliance when used with appropriate series impedance and PCB layout per standard test configurations.

Is the 1N5652A suitable for high-temperature environments like engine control units?

Yes, the 1N5652A is rated for continuous operation from -55°C to +175°C and features a thermal resistance of 50°C/W junction-to-lead. Its hermetic DO-13 package and tin-lead plating maintain stable electrical characteristics and solder joint integrity in under-hood automotive or turbine-mounted industrial applications where ambient temperatures exceed 125°C.

How does the cathode-is-case construction of the 1N5652A affect PCB layout?

The 1N5652A's cathode is internally connected to the metal case, requiring the case (and thus one lead) to be tied directly to the system ground plane. This mandates a low-inductance, wide copper pour connection to minimize clamping voltage overshoot. Layout must avoid routing signal traces near the case and ensure mechanical mounting does not electrically isolate the cathode from ground.

What is the significance of the "A" suffix in 1N5652A versus 1N5652?

The "A" suffix denotes tighter parametric tolerances and full MIL-PRF-19500/500 qualification, including screening for JANTXV-level military applications. While both share identical VWM (50.2 V) and VC (85.0 V), only the 1N5652A guarantees performance across temperature extremes and radiation exposure per MicroNote 050 - critical for flight hardware and defense electronics.