onsemi 1N6294AG

Overview

1N6294AG from ON Semiconductor is a unidirectional 1500 W Mosorb transient voltage suppressor (TVS) diode in axial lead Surmetic package, designed for parallel clamping of high-energy transients. It features a 77.8 V working peak reverse voltage (VRWM), 91 V breakdown voltage (VBR) at 1 A test current, and clamps to ≤125 V at 12 A peak pulse current, protecting sensitive CMOS/MOS circuits in power supplies and industrial controls.

For engineers reviewing the 1N6294AG datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, UL 497B certification status, clamping performance under 1 ms surge, ESD robustness (>16 kV HBM), and real-world layout guidance for minimizing inductive overshoot in protection circuits.

Technical Context

The 1N6294AG operates as a unidirectional avalanche diode with fast response time (<1 ns), low dynamic impedance, and thermal stability up to +175°C junction temperature. Its clamping action begins at VRWM = 77.8 V and fully engages at VBR = 91 V (min 86.5 V, max 95.5 V), delivering predictable overvoltage protection without forward conduction during normal operation.

Designed for non-repetitive 1 ms pulses, it sustains 1500 W peak power at TL ≤ 25°C and derates linearly above 75°C ambient, with steady-state dissipation limited to 5.0 W at TL = 75°C. Its 20 °C/W junction-to-lead thermal resistance enables reliable heat transfer through axial leads in PCB-mounted applications.

Key Specifications

Pinout & Package

1N6294AG uses the CASE 41A axial lead plastic package (Surmetic), with cathode indicated by a polarity band on the body. Leads are corrosion-resistant, solderable, and rated for 260°C for 10 seconds at 1/16 inch from case.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N6294AG, 1.5KE91AG offers identical electrical and mechanical performance with alternate part numbering, while SMBJ90A trades axial lead robustness and 1500 W capacity for compact SMT integration at reduced surge capability and altered thermal management requirements.

Availability

1N6294AG is available at Aetrix Electronics and suitable for power supply input protection, industrial PLC I/O protection, and medical equipment power rails requiring stable component supply and full traceability.

Supply support for 1N6294AG 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, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The 1N6294AG belongs to the 1N6267A Series Mosorb TVS family, engineered specifically for high-reliability transient suppression in harsh industrial and medical environments where UL 497B certification and 1500 W surge resilience are mandatory.

FAQ

What is the clamping voltage of the 1N6294AG at its rated peak pulse current?

The 1N6294AG clamps to a maximum of 125 V at its specified peak pulse current of 12 A, measured under the standard 1 ms exponential waveform defined in Figure 5 of the datasheet. This value ensures downstream components see no more than 125 V during surge events, making the 1N6294AG suitable for protecting 100 V-rated circuits. The actual clamping voltage may vary slightly with temperature and pulse repetition rate, but remains tightly bounded per ON Semiconductor's characterization.

Is the 1N6294AG RoHS compliant and lead-free?

Yes, the 1N6294AG is Pb-free and RoHS compliant, as confirmed by the "G" suffix in its part number and explicit statement in the datasheet's Mechanical Characteristics section. The device uses ON Semiconductor's Surmetic axial leaded package with lead-free terminations, meeting JEDEC J-STD-609 Category 1 requirements. Full compliance documentation, including material declarations, is available through onsemi's official product portal for the 1N6267A Series.

Does the 1N6294AG require a heatsink for continuous operation?

No, the 1N6294AG is not intended for continuous power dissipation; it is rated for non-repetitive 1500 W surges. Its steady-state power dissipation is limited to 5.0 W at 75°C lead temperature, and thermal design relies on PCB copper and lead conduction-not external heatsinks. For repetitive surge conditions, average power must be calculated using duty cycle derating curves (Figure 7), and layout must ensure adequate copper area around leads to maintain TL ≤ 75°C.

How does the 1N6294AG differ from bidirectional TVS diodes like P6KE91A?

The 1N6294AG is unidirectional and protects only positive-going transients relative to ground, whereas P6KE91A clamps both polarities. This makes the 1N6294AG ideal for DC-powered circuits where reverse voltage is not expected, offering tighter VBR tolerance and lower leakage (<5 µA above 10 V). In contrast, P6KE91A introduces higher capacitance and leakage, potentially affecting signal integrity in high-speed or low-power applications where the 1N6294AG's unidirectional behavior provides superior noise margin.

Can the 1N6294AG be used in automotive applications?

The 1N6294AG meets key automotive surge immunity requirements such as ISO 7637-2 Pulse 1 and Pulse 2a, but it is not AEC-Q200 qualified. Its operating temperature range (−65°C to +175°C) supports under-hood environments, and UL 497B certification adds confidence for infotainment and body-control module interfaces. However, for safety-critical powertrain or ADAS systems, AEC-Q200-qualified alternatives like SMAJ90A should be selected unless full qualification testing is performed on the 1N6294AG for the specific vehicle platform.