onsemi 1N6267ARL4

Overview

1N6267ARL4 from ON Semiconductor is a unidirectional 1500 W transient voltage suppressor (TVS) diode designed for parallel overvoltage protection of sensitive electronics. It features a 5.8 V working peak reverse voltage (VRWM), clamps at 10.5 V under 143 A peak pulse current (IPP), and delivers sub-1 ns response time with <5 µA leakage above 10 V. It is used in power supply input stages to protect downstream CMOS/MOS ICs from ESD and lightning-induced surges.

For engineers reviewing the 1N6267ARL4 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin relative to protected circuit's absolute maximum rating, VRWM alignment with DC bus voltage, surge current capability per IEC 61000-4-5 waveform, and UL 497B recognition for isolated loop protection compliance.

Technical Context

The 1N6267ARL4 operates as a silicon avalanche diode optimized for transient suppression-not steady-state regulation. Its low zener impedance (<1 Ω dynamic) and fast turn-on ensure minimal overshoot during 8.3 ms half-sine surges up to 143 A. The device uses Surmetic axial-leaded packaging with void-free thermoset plastic encapsulation and Pb-free external leads.

It is rated for −65°C to +175°C operating temperature, has 20°C/W junction-to-lead thermal resistance, and meets Class 3 ESD immunity (>16 kV HBM). Clamping behavior is defined by the 1 ms 1500 W peak power pulse test per Figure 5, with derating applied above 25°C ambient or 75°C lead temperature.

Key Specifications

Pinout & Package

Package: Axial-leaded Surmetic plastic case (JEDEC Case 41A), 8.5–9.5 mm body length, 4.8–5.3 mm diameter, cathode indicated by band. Lead finish is Pb-free; max soldering temperature is 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 SMBJ5.0A and 1.5KE6.8A, the 1N6267ARL4 provides full 1500 W surge handling in axial-leaded form-critical for high-energy industrial environments-while 1.5KE6.8A offers identical performance with alternate part numbering, and SMBJ5.0A trades power for compact surface-mount integration.

Availability

1N6267ARL4 is available at Aetrix Electronics and suitable for power supply input protection, industrial PLC I/O protection, medical equipment power rails, and telecom line interface protection requiring stable component supply and long-term lifecycle support.

Supply support for 1N6267ARL4 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 supplier specializing in energy-efficient power management, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The 1N6267ARL4 belongs to the Mosorb® series of high-power TVS diodes, engineered specifically for robust, cost-effective overvoltage protection in harsh electromagnetic environments where reliability and regulatory compliance are mandatory.

FAQ

What is the clamping voltage of the 1N6267ARL4 under maximum surge conditions?

The 1N6267ARL4 clamps at 10.5 V when subjected to its rated peak pulse current of 143 A (1 ms waveform). This value is measured per Figure 5 in the datasheet and represents the maximum voltage imposed on the protected circuit during worst-case transient events. Designers must verify this clamping level remains below the absolute maximum voltage rating of downstream components. The 1N6267ARL4 maintains this performance across its specified operating temperature range.

Is the 1N6267ARL4 suitable for bidirectional signal line protection?

No, the 1N6267ARL4 is a unidirectional TVS diode and only protects against positive-going transients on the cathode side. It conducts in forward bias like a standard diode and does not suppress negative excursions. For bidirectional protection-such as on RS-485 or USB data lines-use the complementary 1.5KE6.8CA or SMBJ5.0CA. The 1N6267ARL4 must be oriented with cathode toward the protected line and anode to ground to function correctly.

Does the 1N6267ARL4 meet UL 497B requirements for isolated loop protection?

Yes, the 1N6267ARL4 is UL Recognized under file QVGV2 to UL 497B for protectors, covering isolation barrier applications in telecom and industrial data interfaces. This certification validates performance in strike voltage breakdown, endurance conditioning, dielectric withstand, and discharge testing-beyond basic flammability compliance. The 1N6267ARL4's recognition applies specifically to its unidirectional configuration and Surmetic axial package.

What is the thermal resistance and power derating behavior of the 1N6267ARL4?

The 1N6267ARL4 has a junction-to-lead thermal resistance (R_JL) of 20°C/W and a steady-state power dissipation of 5.0 W at T_L ≤ 75°C. Power must be linearly derated above 75°C lead temperature at 20 mW/°C. For pulsed operation, peak power drops per Figure 1 above 25°C ambient, and duty cycle derating follows Figure 7. Proper heatsinking of leads is essential for repeated surge events. The 1N6267ARL4's thermal design supports reliable operation in enclosed industrial enclosures.

How does the 1N6267ARL4 compare to the 1.5KE6.8A in terms of electrical and mechanical compatibility?

The 1N6267ARL4 and 1.5KE6.8A share identical electrical specifications-including VRWM (5.8 V), V_BR (6.45–7.14 V), I_PP (143 A), and V_C (10.5 V)-and both use JEDEC Case 41A axial packaging with Pb-free leads. They are manufactured on the same process line and differ only in part numbering convention. The 1N6267ARL4 is the JEDEC-registered designation; 1.5KE6.8A is ON Semiconductor's proprietary code. Either may be used interchangeably in the same footprint and schematic symbol.