onsemi 1N6379RL4G

Overview

1N6379RL4G from onsemi is a unidirectional transient voltage suppressor (TVS) diode designed for parallel protection of sensitive electronics against high-energy ESD and surge events. It features a 36 V working peak reverse voltage (VRWM), 1500 W peak pulse power (1 ms), clamping voltage of 50.6 V at 23 A IPP, <2.0 µA leakage at VRWM, and sub-1 ns response time. It is used in industrial power supplies and communication interfaces to safeguard CMOS/MOS ICs.

For engineers reviewing the 1N6379RL4G datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM margin over operating voltage, clamping voltage vs. device withstand rating, surge current capability, thermal derating above 25°C, and axial lead package compatibility with through-hole PCB layouts.

Technical Context

The 1N6379RL4G operates as a Zener-based avalanche clamp, entering conduction when reverse voltage exceeds its 42.4 V minimum breakdown voltage (VBR @ IT = 1 A). Its low dynamic impedance and fast junction response enable effective suppression of 8/20 µs and 10/1000 µs transients without significant overshoot-provided layout minimizes trace inductance.

It is rated for non-repetitive 1500 W surges per JEDEC standard, with thermal resistance of 20 °C/W (junction-to-lead) and steady-state dissipation of 5.0 W at TL ≤ 75°C. The device complies with Class 3 HBM ESD (>16 kV) and uses a void-free Surmetic thermoset plastic case (Case 41A) with Pb-free leads.

Key Specifications

Pinout & Package

Package: Axial lead, Case 41A (Surmetic thermoset plastic), cathode indicated by polarity band. Dimensions: A = 8.5–9.5 mm (length), B = 4.8–5.3 mm (diameter), D = 0.96–1.06 mm (lead diameter), K = 25.4 mm (lead length).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ36A and 1N6380RL4G, the 1N6379RL4G offers proven axial-lead mechanical robustness for high-vibration environments, lower clamping voltage than SMBJ36A, and identical electrical performance to 1N6380RL4G-making it optimal for industrial through-hole designs requiring long-term field reliability.

Availability

1N6379RL4G is available at Aetrix Electronics and suitable for industrial power supplies, telecom line interfaces, medical equipment power inputs, and programmable logic controllers requiring stable component supply and long-lifecycle support.

Supply support for 1N6379RL4G 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient silicon solutions for automotive, industrial, cloud, and IoT applications.

The 1N6379RL4G belongs to the Mosorb® TVS family, engineered specifically for high-reliability, high-surge industrial and communications infrastructure-emphasizing rugged axial packaging, tight VBR distribution, and repeatable clamping performance under thermal stress.

FAQ

What is the working peak reverse voltage (VRWM) of the 1N6379RL4G?

The 1N6379RL4G has a VRWM of 36 V, meaning it remains non-conductive under continuous reverse bias up to this voltage. This value is selected to exceed typical 24 V or 28 V industrial bus voltages while allowing sufficient margin before breakdown at 42.4 V min. Designers must ensure VRWM ≥ maximum steady-state circuit voltage to avoid leakage-related power loss or thermal runaway.

How does the 1N6379RL4G compare to bidirectional TVS diodes?

The 1N6379RL4G is unidirectional and optimized for DC or single-polarity signal lines. Unlike bidirectional variants, it provides lower capacitance and tighter VBR control in one direction but cannot suppress negative-going transients. For AC-coupled or differential lines like RS-485, a bidirectional device would be required-whereas the 1N6379RL4G suits 24 V PLC inputs or DC power rails where polarity is fixed.

What is the maximum clamping voltage (VC) of the 1N6379RL4G under surge conditions?

The 1N6379RL4G clamps to 50.6 V at 23 A peak pulse current (IPP), measured per Figure 5 waveform (1 ms, 8.3 ms half-sine). This VC defines the upper voltage limit imposed on protected circuitry during a 1500 W transient. To ensure safety, downstream ICs must have absolute maximum ratings exceeding 50.6 V-or additional series impedance must be added to limit current further.

Can the 1N6379RL4G be used in surface-mount designs?

No-the 1N6379RL4G uses an axial lead package (Case 41A) and is not compatible with SMT processes. For surface-mount alternatives, consider the SMBJ36A or SMCJ36A families, which offer similar VRWM and power ratings but require different footprint, stencil, and reflow profile. Substituting 1N6379RL4G into an SMT layout would necessitate mechanical adapters or redesign.

What thermal derating applies to the 1N6379RL4G at elevated temperatures?

The 1N6379RL4G's peak pulse power must be derated above TA = 25°C per Figure 1, and its steady-state power drops from 5.0 W at TL = 75°C to zero at TL = 125°C (derated at 20 mW/°C). Lead temperature must stay ≤260°C for 10 s during soldering. For continuous surge duty, ambient temperature and board copper area must be modeled to maintain junction temperature below 175°C.