Microchip Technology JAN1N4148UB2

Overview

JAN1N4148UB2 from Microsemi is a military-qualified ceramic surface-mount switching diode compliant with MIL-PRF-19500/116 at JAN level, featuring 75 V working peak reverse voltage, 200 mA average rectified current at 75 °C, and 5 ns reverse recovery time - deployed in high-frequency RS-232 interfaces and Ethernet 10 Base-T data lines.

For engineers reviewing the JAN1N4148UB2 datasheet, JAN1N4148UB2 pinout, JAN1N4148UB2 application, or JAN1N4148UB2 equivalent, key selection criteria include reverse recovery time (5 ns), low junction capacitance (4.0 pF @ 0 V), gold-plated terminals, ceramic package thermal resistance (120 °C/W junction-to-solder pad), and JAN-level reliability qualification for aerospace and defense systems.

Technical Context

This diode operates as a unidirectional signal-level switch in high-speed digital and communication circuits. Its ceramic UB2 package enables stable performance across –65 °C to +200 °C junction temperature range while maintaining low parasitic capacitance and fast transition between forward conduction and reverse blocking states.

The device exhibits defined electrical behavior under standardized test conditions: VF = 0.8 V @ IF = 10 mA, IR ≤ 25 nA @ VR = 20 V, and trr = 5 ns with IF = IR = 10 mA and RL = 100 Ω. Reverse polarity variants are available via R-suffix nomenclature.

Key Specifications

Pinout & Package

Two-terminal ceramic surface-mount device in UB2 package: anode and cathode terminals mounted on opposite ends of a rectangular ceramic body with gold-plated nickel underplate; marking includes part number, date code, and manufacturer ID.

Key Features

Applications

Equivalent & Alternatives

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

Compared with JAN1N4148UB2, 1N4148UR-1 offers identical speed and capacitance in a more automatable MELF form factor but lacks military qualification; JANTXV1N4148UB2 provides identical packaging and enhanced reliability screening for safety-critical deployments.

Availability

JAN1N4148UB2 is available at Aetrix Electronics and suitable for RS-232 interface protection, Ethernet 10 Base-T line clamping, and avionics data bus steering requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for JAN1N4148UB2 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

Microsemi Corporation (now part of Microchip Technology) designs high-reliability analog and RF semiconductors for aerospace, defense, and industrial markets.

The JAN1N4148UB2 belongs to Microsemi's military-qualified discrete diode family, engineered specifically for signal integrity preservation and environmental resilience in harsh-condition electronic systems.

FAQ

What is the reverse recovery time specification for JAN1N4148UB2?

The JAN1N4148UB2 has a reverse recovery time (trr) of 5 ns, measured under standard conditions of IF = IR = 10 mA and RL = 100 Ω. This value is critical for minimizing switching losses and signal distortion in high-frequency digital circuits. The 5 ns trr is confirmed in the official Microsemi T4-LDS-0281-3 datasheet and applies directly to the JAN1N4148UB2 variant.

Does JAN1N4148UB2 have RoHS compliance?

Yes, JAN1N4148UB2 is RoHS compliant by design, as explicitly stated in the Microsemi datasheet. Its construction uses lead-free materials and processes consistent with Directive 2011/65/EU, while retaining full MIL-PRF-19500/116 JAN qualification. This dual compliance makes JAN1N4148UB2 suitable for both environmentally regulated and defense-critical applications.

What is the maximum operating junction temperature for JAN1N4148UB2?

The maximum junction temperature for JAN1N4148UB2 is +200 °C, with a minimum of –65 °C. This wide range is enabled by its ceramic package and gold-plated terminals, supporting operation in extreme environments such as engine-mounted avionics or downhole drilling tools. The specification is validated per MIL-PRF-19500/116 and documented in the T4-LDS-0281-3 datasheet.

How does the UB2 package differ from the DO-35 package in JAN1N4148UB2?

The JAN1N4148UB2 uses a surface-mount ceramic UB2 package, whereas the DO-35 version is axial-leaded. UB2 offers lower profile, better thermal resistance (120 °C/W junction-to-solder pad), and hermetic sealing - essential for high-reliability applications. The DO-35 variant (e.g., 1N4148-1) is through-hole and lacks military qualification unless separately specified. JAN1N4148UB2 is not interchangeable with DO-35 due to mechanical and qualification differences.

Is JAN1N4148UB2 available in reverse polarity configuration?

Yes, JAN1N4148UB2 is available in reverse polarity, denoted by the "R" suffix in the part nomenclature (e.g., JAN1N4148UB2R). Per the Microsemi part numbering guide, the "R" indicates cathode-anode orientation reversal relative to the standard version. This option supports layout flexibility in differential or bidirectional protection schemes without redesigning PCB footprints - a feature confirmed in the T4-LDS-0281-3 nomenclature section.