onsemi 1N6286A

Overview

1N6286A from ON Semiconductor is a unidirectional 1500 W transient voltage suppressor (TVS) diode designed for parallel clamping protection of sensitive electronics against high-energy surges. It features a working peak reverse voltage (VRWM) of 36.8 V, clamping voltage (VC) of 59.3 V at 25.3 A peak pulse current (IPP), and sub-1 ns response time. It is used in industrial power supplies to safeguard downstream MOS/CMOS ICs from lightning-induced transients.

For engineers reviewing the 1N6286A datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM margin over operating DC bus, VC vs. protected device's absolute maximum rating, UL 497B certification for isolated loop compliance, and axial leaded Surmetic package thermal performance under repetitive surge conditions.

Technical Context

The 1N6286A operates as a silicon avalanche diode with precise Zener-based breakdown behavior, triggered when reverse voltage exceeds its 43 V nominal breakdown voltage (VBR) at 1 mA test current. Its low dynamic impedance ensures stable clamping across the full 25.3 A IPP range, while its <1 ns intrinsic response enables suppression before system-level protection can react.

Designed for single-polarity surge events, it conducts only in reverse bias during overvoltage, with forward conduction limited to standard diode behavior (VF ≤ 3.5 V at 100 A). Its thermal resistance (RJL = 20 °C/W) and 5.0 W steady-state dissipation at TL ≤ 75°C support reliable operation in convection-cooled industrial enclosures with 3/8″ lead length.

Key Specifications

Pinout & Package

Package: Axial-leaded Surmetic plastic case (JEDEC CASE 41A), void-free transfer-molded thermoset, cathode indicated by polarity band, lead finish Pb-free, max solder temperature 230°C at 1/16″ from case for 10 s.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N6286A, SMBJ36A offers smaller footprint but reduced surge capacity and different thermal path, while 1.5KE43A is electrically and mechanically identical-making it a direct marking alternative rather than a functional substitute.

Availability

1N6286A is available at Aetrix Electronics and suitable for industrial power supplies, telecom line interfaces, medical isolated loops, and process control sensor conditioning requiring stable component supply and UL-recognized surge protection.

Supply support for 1N6286A 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 onsemi) is a global semiconductor manufacturer specializing in power management, analog, sensors, and discrete devices for automotive, industrial, and cloud power applications.

The 1N6286A belongs to the Mosorb 1500 W TVS series, engineered specifically for robust, cost-effective overvoltage protection in harsh industrial environments where reliability, UL compliance, and high-energy surge handling are mandatory.

FAQ

What is the maximum clamping voltage of the 1N6286A under surge conditions?

The 1N6286A clamps to a maximum of 59.3 V when subjected to its rated peak pulse current of 25.3 A (1 ms exponential waveform). This value is measured per Figure 5 in the datasheet and represents the worst-case voltage imposed on protected circuitry during a full-energy surge event. Designers must ensure this clamping level remains below the absolute maximum voltage rating of downstream components. The 1N6286A achieves this with low dynamic impedance and tightly controlled VBR distribution.

Is the 1N6286A suitable for bidirectional transient protection?

No, the 1N6286A is a unidirectional TVS diode and conducts only during reverse-bias overvoltage events. It does not protect against positive-going transients on the anode side. For bidirectional protection, ON Semiconductor offers the 1.5KE43CA (pin-compatible, same package), which provides symmetrical clamping for both polarities. Using 1N6286A in bidirectional applications risks failure during positive surges, as it lacks forward avalanche capability.

Does the 1N6286A meet UL 497B requirements for isolated loop protection?

Yes, the 1N6286A carries UL 497B recognition under file #116110 (QVGV2 category), confirming compliance for isolated loop circuit protection in telecommunications and industrial control systems. This certification covers dielectric withstand, endurance conditioning, and strike voltage breakdown testing-distinct from basic flammability ratings. The 1N6286A is explicitly listed in the UL-recognized 1N6267A series documentation.

What is the thermal resistance and steady-state power limit of the 1N6286A?

The 1N6286A has a junction-to-lead thermal resistance (RJL) of 20 °C/W and a steady-state power dissipation (PD) of 5.0 W at lead temperature (TL) ≤ 75°C with 3/8″ lead length. Derating is linear above 75°C at 20 mW/°C. These values define safe continuous operation limits-critical when the 1N6286A is exposed to repetitive lower-energy transients or elevated ambient temperatures in enclosed enclosures.

How does the 1N6286A compare to the 1.5KE43A in terms of specifications and compatibility?

The 1N6286A and 1.5KE43A are electrically and mechanically identical parts: same VRWM (36.8 V), same VC (59.3 V @ 25.3 A), same CASE 41A axial package, and same UL 497B recognition. They originate from the same ON Semiconductor die and assembly process-the only difference is JEDEC (1N6286A) versus proprietary (1.5KE43A) part numbering. The 1N6286A may be substituted for 1.5KE43A without design or layout changes.