onsemi FJP5027O

Overview

FJP5027O from ON Semiconductor is an NPN silicon power transistor designed for high-voltage switching applications, featuring 800 V V_CEO, 3 A continuous collector current, 50 W power dissipation at T_C = 25°C, and 15 MHz transition frequency. It operates in hard-switched flyback converters, snubberless AC-DC power supplies, and industrial motor control inverters.

For engineers reviewing the FJP5027O datasheet, pinout, applications, or equivalent options, key selection criteria include its 800 V sustaining voltage under clamped inductive load (V_CEX(sus)), wide SOA with 3 µs storage time, and TO-220 package thermal performance validated across -55°C to +150°C junction range.

Technical Context

The FJP5027O employs a planar epitaxial base structure optimized for rugged high-voltage operation, supporting fast switching with t_ON = 0.5 µs and t_F = 0.3 µs under specified resistive-load conditions. Its DC current gain spans h_FE1 = 20–40 at I_C = 1 A, enabling stable base drive design across temperature.

Designed for snubberless inductive switching, the device delivers V_CEX(sus) = 800 V with I_C = 1.5 A and clamped L = 2 mH, while maintaining low saturation voltages: V_CE(sat) = 2 V and V_BE(sat) = 1.5 V at I_C = 1.5 A / I_B = 0.3 A - critical for efficiency in high-duty-cycle power stages.

Key Specifications

Pinout & Package

Package: TO-220 (JEDEC variation AB, 3-lead, isolated tab). Thermal pad electrically connected to collector; mounting screw must be insulated from heatsink unless collector is at ground potential.

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 MJ11016, the FJP5027O uniquely balances 800 V blocking, 3 A DC current, and TO-220 thermal performance - making it optimal for compact, high-input-voltage switch-mode power supplies where voltage margin and board space are critical constraints.

Availability

FJP5027O is available at Aetrix Electronics and suitable for industrial motor drives, AC-DC power supplies, induction heating controls, and UPS inverter stages requiring stable component supply and long-term manufacturing continuity.

Supply support for FJP5027O 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 is a global semiconductor manufacturer specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The FJP5027O belongs to ON Semiconductor's high-voltage bipolar transistor product line, engineered specifically for robust, snubberless switching in industrial power conversion systems operating up to 800 V DC bus.

FAQ

What is the maximum safe operating voltage for FJP5027O in inductive switching applications?

The FJP5027O is rated for V_CEX(sus) = 800 V under clamped inductive load conditions (I_C = 1.5 A, L = 2 mH), which defines its maximum safe operating voltage in snubberless switching. This value is validated per JEDEC test methods and exceeds its 800 V V_CEO rating due to built-in secondary breakdown immunity. For unclamped loads, derating to 600 V is recommended. The FJP5027O must not be operated beyond its absolute maximum V_CBO = 1100 V under any condition.

Does FJP5027O require a heatsink in continuous 3 A operation?

Yes - at I_C = 3 A and V_CE(sat) ≈ 2.2 V, conduction loss alone reaches ~6.6 W, and switching losses add further thermal load. With P_C = 50 W at T_C = 25°C, the FJP5027O requires a heatsink with ≤1.2°C/W thermal resistance to maintain T_J ≤ 150°C at ambient 50°C. The TO-220 package tab is electrically connected to the collector, so electrical isolation is mandatory unless the heatsink is at collector potential.

What is the hFE classification letter for FJP5027O and how does it affect base drive design?

The "O" suffix in FJP5027O denotes the highest h_FE classification group: h_FE1 = 20–40 at I_C = 0.2 A and h_FE2 = 15–30 at I_C = 1 A. This allows conservative base drive design using I_B = I_C/10 (e.g., 0.3 A for 3 A collector current), ensuring deep saturation across temperature and aging. The FJP5027O's consistent h_FE spread simplifies fixed-resistor biasing without feedback compensation.

Can FJP5027O replace older Fairchild FJP5027 in existing designs?

Yes - the FJP5027O is the ON Semiconductor–branded successor to the Fairchild FJP5027, with identical electrical specifications, pinout, package (TO-220), and thermal characteristics. The "O" suffix reflects updated nomenclature post-Fairchild integration; no design changes or requalification are required when migrating from FJP5027 to FJP5027O. Both share Rev. A December 2003 datasheet content and qualification standards.

What is the safe operating area (SOA) limitation for FJP5027O at 100°C case temperature?

At T_C = 100°C, the FJP5027O's SOA is limited to I_C ≤ 1.8 A at V_CE = 400 V (DC), per Figure 6 in the datasheet. This reflects 60% of its 25°C DC SOA limit, due to reduced thermal headroom and increased V_CE(sat). Pulse operation (≤1 ms) extends the boundary to I_C = 4.5 A at V_CE = 400 V. Designers must verify SOA compliance using actual operating V_CE and I_C waveforms - the FJP5027O's wide SOA avoids second breakdown in properly damped circuits.