onsemi 1N6285ARL4

Overview

1N6285ARL4 from ON Semiconductor is a unidirectional 1500 W Mosorb transient voltage suppressor (TVS) diode designed for parallel clamping protection of sensitive electronics against high-energy transients. It features a 33.3 V working peak reverse voltage (VRWM), 39 V breakdown voltage (VBR) at 1 mA, 53.9 V clamping voltage (VC) at 28 A peak pulse current (IPP), and sub-1 ns response time. It is used in industrial power supplies to safeguard rectifier outputs and DC bus lines.

For engineers reviewing the 1N6285ARL4 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin relative to protected IC V_MAX, surge current capability under 8.3 ms waveform, UL 497B recognition for isolated loop circuits, and axial lead (Case 41A) mechanical compatibility with through-hole PCB layouts.

Technical Context

This device operates as a voltage-clamped shunt protector: when transient voltage exceeds its VBR (39 V), it avalanches into low-impedance conduction, diverting surge current away from downstream circuitry while limiting voltage across the load to ≤53.9 V. Its thermal resistance (R_JL = 20 °C/W) and 5.0 W steady-state dissipation (at T_L ≤ 75 °C) support reliable operation under repeated low-duty-cycle surges.

The 1N6285ARL4 is optimized for unidirectional DC line protection - it conducts only in reverse bias during overvoltage events and blocks forward current up to 3.5 V. Its <5 µA leakage above 10 V and ESD rating >16 kV (HBM) ensure minimal standby impact and robust electrostatic immunity in automated assembly environments.

Key Specifications

Pinout & Package

1N6285ARL4 is housed in an axial-leaded Surmetic plastic package (Case 41A), with cathode identified by a polarity band. Leads are Pb-free, solderable at 230 °C for 10 seconds at 1/16 inch from case. Mounting position is unrestricted.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ33A and P6KE33A, the 1N6285ARL4 offers superior UL 497B certification for isolated circuits, tighter VBR tolerance (±5% vs ±10%), and lower clamping ratio (VC/VBR = 1.38), making it preferred for safety-critical industrial and medical systems where regulatory compliance and precise voltage limiting are mandatory.

Availability

1N6285ARL4 is available at Aetrix Electronics and suitable for industrial power supplies, telecom line interfaces, medical equipment power inputs, and process control sensor interfaces requiring stable component supply and long-term manufacturability.

Supply support for 1N6285ARL4 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

ON Semiconductor (now part of onsemi) is a global semiconductor manufacturer specializing in power management, analog, sensors, and connectivity solutions for automotive, industrial, cloud, and IoT applications.

The 1N6285ARL4 belongs to the 1N6267A Series of Mosorb TVS diodes - engineered specifically for high-reliability, high-surge industrial and medical systems requiring UL-recognized, axial-leaded transient protection with predictable clamping behavior.

FAQ

What is the clamping voltage of the 1N6285ARL4 and how is it measured?

The 1N6285ARL4 has a maximum clamping voltage (VC) of 53.9 V, measured at a peak pulse current (IPP) of 28 A using the standard 10/1000 µs double-exponential surge waveform defined in Figure 5 of the datasheet. This value represents the highest voltage that will appear across the 1N6285ARL4 during a worst-case transient event, ensuring downstream components remain within safe operating limits.

Is the 1N6285ARL4 RoHS compliant and what is its lead finish?

Yes, the 1N6285ARL4 is RoHS compliant and manufactured with a Pb-free external lead finish only, as explicitly stated in the "Mechanical Characteristics" section of the datasheet. The leads are readily solderable and rated for 230 °C for 10 seconds at 1/16 inch from the case, supporting standard lead-free reflow and wave soldering processes.

Does the 1N6285ARL4 have UL recognition and for which standard?

Yes, the 1N6285ARL4 carries UL 497B recognition under file #116110 for the classification of protectors (QVGV2). This certification applies specifically to isolated loop circuit protection and confirms successful completion of tests including strike voltage breakdown, endurance conditioning, dielectric withstand, and discharge performance - critical for telecom and medical applications.

How does the 1N6285ARL4 differ from bidirectional TVS diodes like 1N6285CA?

The 1N6285ARL4 is unidirectional and conducts only during reverse-bias overvoltage events, making it ideal for DC line protection. In contrast, 1N6285CA is bidirectional and clamps transients of either polarity - required for AC lines or differential data signals. The "A" suffix denotes unidirectional; "CA" denotes bidirectional; they are not interchangeable without circuit redesign.

What is the maximum steady-state power dissipation rating for the 1N6285ARL4?

The 1N6285ARL4 has a steady-state power dissipation (PD) rating of 5.0 W at a lead temperature (TL) ≤ 75 °C with 3/8 inch lead length. This rating derates linearly above 75 °C at 20 mW/°C, reaching zero dissipation at 100 °C TL. This parameter governs continuous power handling during sustained overvoltage conditions, distinct from its 1500 W transient rating.