onsemi FJP5021OV

Overview

FJP5021OV from Fairchild Semiconductor is an NPN silicon power transistor designed for high-voltage switching applications, featuring 800 V collector-base breakdown voltage (BVCBO), 500 V collector-emitter sustaining voltage (VCEX(sus)), and 5 A DC collector current (IC). It delivers fast switching with typical fall time of 0.1 µs and operates reliably up to 150 °C junction temperature in industrial motor drives and snubberless AC switchers.

For engineers reviewing the FJP5021OV datasheet, pinout, applications, or equivalent options, key selection criteria include safe operating area (SOA) robustness at high VCE, low saturation voltage (VCE(sat) = 1 V @ IC = 3 A, IB = 0.6 A), and verified reverse-bias SOA performance under inductive load conditions.

Technical Context

The FJP5021OV employs a planar epitaxial base structure optimized for high-voltage blocking and rugged switching. Its wide forward-bias SOA supports sustained operation at VCE ≥ 400 V and IC ≥ 2 A without secondary breakdown, while the reverse-bias SOA enables reliable clamped inductive turn-off with L = 1 mH and IB1 = −IB2 = 1 A.

Designed for snubberless AC switching, it integrates fast turn-off characteristics (tF = 0.1–0.3 µs) and low output capacitance (Cob = 80 pF @ VCB = 10 V), enabling efficient operation in phase-control and solid-state relay circuits operating up to 500 V RMS line voltage.

Key Specifications

Pinout & Package

Supplied in TO-220 package with isolated mounting tab; pin assignment: Pin 1 = Base, Pin 2 = Collector (tab-connected), Pin 3 = Emitter.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage NPN switching transistor applications.

Compared with ST13007 and MJE13009, the FJP5021OV uniquely combines 500 V sustaining voltage, 0.1 µs fall time, and documented reverse-bias SOA-making it the only option among the three qualified for snubberless 230 VAC phase-control designs without additional protection circuitry.

Availability

FJP5021OV is available at Aetrix Electronics and suitable for AC motor control, solid-state relay design, inductive load driving, and high-voltage DC chopper applications requiring stable component supply and long-term industrial availability.

Supply support for FJP5021OV 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

Fairchild Semiconductor was a U.S.-based designer of analog and discrete semiconductors, acquired by ON Semiconductor in 2016; its legacy power transistor portfolio remains widely deployed in industrial and appliance systems.

The FJP5021OV belongs to Fairchild's high-voltage NPN transistor family engineered specifically for snubberless AC switching, emphasizing rugged SOA, fast switching, and high-voltage reliability in motor controls and solid-state relays.

FAQ

What is the maximum continuous collector current rating for the FJP5021OV?

The FJP5021OV has a maximum DC collector current (IC) rating of 5 A at TC = 25°C. Derating is required above 25°C case temperature per the power derating curve in Figure 8 of the datasheet, reaching zero current at 150°C junction temperature. This rating assumes adequate heatsinking and operation within the forward-bias SOA limits defined in Figure 6.

Does the FJP5021OV support snubberless AC switching, and what evidence supports this claim?

Yes, the FJP5021OV supports snubberless AC switching. The datasheet explicitly states "Snubberless AC Switching" in the features section and provides VCEX(sus) = 500 V (clamped, IC = 2.5 A, IB1 = −IB2 = 1 A) and reverse-bias SOA curves (Figure 7), confirming validated operation under inductive turn-off without external snubbers-key for phase-control and SSR applications.

What is the pin configuration and thermal connection of the FJP5021OV in its TO-220 package?

The FJP5021OV uses a standard TO-220 package with pinout: Pin 1 = Base, Pin 2 = Collector (internally connected to the metal tab), Pin 3 = Emitter. The collector tab must be electrically isolated from the heatsink unless the circuit design intentionally references the collector to chassis ground, as specified in the package dimensions drawing and thermal notes.

How does the FJP5021OV's fall time compare to similar high-voltage transistors, and why does it matter?

The FJP5021OV has a typical fall time (tF) of 0.1 µs, significantly faster than alternatives like MJE13009 (tF ≈ 0.5 µs) or ST13007 (tF ≈ 0.3 µs). This enables higher PWM frequencies, reduced switching losses, and tighter timing control in phase-angle dimmers and choppers-critical for minimizing audible noise and improving efficiency in motor and heater control.

Is the FJP5021OV suitable for use in life support devices or critical medical equipment?

No, the FJP5021OV is not authorized for use in life support devices or systems. Fairchild's original disclaimer explicitly states that its products are not approved for such applications without express written consent. Designers must follow the Life Support Policy in the datasheet and select components certified to ISO 13485 or IEC 62304 for medical-grade implementations.