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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

onsemi FJPF5021O

Name: FJPF5021O
Brand: onsemi
SKU: FJPF5021O
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: FJPF5021O

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-220-3 Full Pack

Datasheet:: FJPF5021O.pdf

Description:: TRANS NPN 500V 5A TO-220F-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

FJPF5021O from onsemi is an NPN silicon power transistor in TO-220 Fullpack package, rated for 500 V V_CEO, 5 A I_C (DC), and 40 W P_C at T_C = 25°C, designed for high-voltage switching in industrial motor drives and AC line-powered power supplies.

For engineers reviewing the FJPF5021O datasheet, pinout, applications, or equivalent options, key selection criteria include its 500 V sustaining voltage under clamped inductive switching, 0.1 µs typical fall time, wide forward/reverse bias SOA, Pb-free TO-220F-3SG package, and h_FE grade O (20–40 at I_C = 0.6 A).

Technical Context

This device operates as a high-voltage, medium-current NPN bipolar junction transistor with robust safe operating area (SOA) up to 100 V/10 A in DC mode and extended reverse-bias SOA under inductive turn-off conditions. Its 15 MHz f_T, 80 pF C_ob, and 0.5 µs t_ON/3 µs t_STG support fast switching in hard-switched converters.

The FJPF5021O features graded base doping and optimized epitaxial layer structure to achieve stable 500 V V_CEO and 800 V V_CBO with low leakage (≤10 µA I_CBO at 500 V). It is specified for operation up to 150°C junction temperature with derated power dissipation above 25°C case temperature.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	500 V - Sustains full-rated collector-emitter voltage under zero-base-current condition; enables use in 400 VAC rectified bus applications.
I_C (DC)	5 A - Continuous collector current capability at T_C = 25°C; supports 100–200 W power stage designs with heatsinking.
t_F	0.1 µs (typ.) - Fast fall time ensures minimal switching loss during turn-off in PWM-controlled inductive loads.
h_FE Grade O	20–40 at V_CE = 5 V, I_C = 0.6 A - Predictable DC gain range simplifies base drive design for linear or saturated switching modes.
P_C	40 W at T_C = 25°C - Thermal performance requires external heatsink for sustained >2 A operation; derates linearly above 25°C case temp.
C_ob	80 pF at V_CB = 10 V - Output capacitance impacts snubber design and EMI in high-dV/dt switching circuits.

Pinout & Package

Package: TO-220 Fullpack (Case 221AT), also designated TO-220F-3SG - insulated tab, vertical mounting, 3-lead through-hole package with integral heatsink interface.

Pin/Terminal	Circuit Role	Design Meaning
1 (Base)	Control electrode	Receives base current to saturate or cut off the transistor; requires ≥0.6 A drive for full 3 A conduction with ≤1 V V_CE(sat).
2 (Collector)	High-side current path	Connected to high-voltage rail (up to 500 V); electrically tied to metal tab - must be isolated from chassis unless common collector configuration used.
3 (Emitter)	Low-side current return	Serves as reference node for base drive; carries full load current; layout must minimize inductance to preserve switching speed and prevent oscillation.

Key Features

Feature	Design Value
High-voltage ruggedness	800 V V_CBO and 500 V V_CEO enable direct replacement of legacy 400–500 V transistors in offline SMPS and motor control.
Wide Forward Bias SOA	Supports 100 V/10 A DC operation without secondary breakdown - critical for linear regulator and lamp dimmer applications.
Clamped inductive switching rating	V_CEX(sus) = 500 V at I_C = 2.5 A with ±1 A base drive - guarantees reliable turn-off under worst-case inductive load conditions.
Pb-free construction	RoHS-compliant lead finish and packaging meet global environmental compliance requirements without derating or reliability impact.

Applications

Industrial Motor Drives	AC-DC Power Supplies
Use Scenario: Driving universal motor commutator segments or brushless DC motor phase legs in 120/230 VAC input appliances. IC Role / Device Role / Timing Role: High-voltage NPN switch controlling motor winding current in half-bridge or single-ended topologies. Use Value: 500 V V_CEO withstands reflected spikes from motor inductance; 0.1 µs t_F minimizes switching loss during PWM commutation.	Use Scenario: Primary-side switching element in flyback or forward converters accepting 85–265 VAC input. IC Role / Device Role / Timing Role: Main power switch turning on/off transformer primary to regulate output voltage via duty cycle control. Use Value: 500 V sustaining voltage accommodates 400 VDC bus with margin; wide SOA prevents thermal runaway during overload or startup.
Lamp Dimmers & Ballasts	Inductive Load Switching
Use Scenario: Phase-angle controlled switching for incandescent/halogen lamp dimming or magnetic HID ballast ignition. IC Role / Device Role / Timing Role: Line-synchronized AC switch conducting during selected portions of each half-cycle. Use Value: 800 V V_CBO ensures immunity to line transients; 150°C T_J rating supports sealed enclosure operation.	Use Scenario: Solenoid, relay, or contactor driver in HVAC controls, industrial automation, and power distribution panels. IC Role / Device Role / Timing Role: High-current, high-voltage switch interfacing microcontroller GPIO to inductive load. Use Value: 10 A I_CP pulse rating handles solenoid inrush; clamped V_CEX(sus) protects against inductive kickback without external snubber.

Industrial Motor Drives

AC-DC Power Supplies

Use Scenario: Driving universal motor commutator segments or brushless DC motor phase legs in 120/230 VAC input appliances.

IC Role / Device Role / Timing Role: High-voltage NPN switch controlling motor winding current in half-bridge or single-ended topologies.

Use Value: 500 V V_CEO withstands reflected spikes from motor inductance; 0.1 µs t_F minimizes switching loss during PWM commutation.

Use Scenario: Primary-side switching element in flyback or forward converters accepting 85–265 VAC input.

IC Role / Device Role / Timing Role: Main power switch turning on/off transformer primary to regulate output voltage via duty cycle control.

Use Value: 500 V sustaining voltage accommodates 400 VDC bus with margin; wide SOA prevents thermal runaway during overload or startup.

Lamp Dimmers & Ballasts

Inductive Load Switching

Use Scenario: Phase-angle controlled switching for incandescent/halogen lamp dimming or magnetic HID ballast ignition.

IC Role / Device Role / Timing Role: Line-synchronized AC switch conducting during selected portions of each half-cycle.

Use Value: 800 V V_CBO ensures immunity to line transients; 150°C T_J rating supports sealed enclosure operation.

Use Scenario: Solenoid, relay, or contactor driver in HVAC controls, industrial automation, and power distribution panels.

IC Role / Device Role / Timing Role: High-current, high-voltage switch interfacing microcontroller GPIO to inductive load.

Use Value: 10 A I_CP pulse rating handles solenoid inrush; clamped V_CEX(sus) protects against inductive kickback without external snubber.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJD127G	Lower V_CEO (100 V), higher h_FE (30–120), TO-220AB package with uninsulated tab	Restricted to low-voltage DC systems (<120 V); unsuitable for AC line-connected circuits	Select only for <100 V DC applications where base drive efficiency is prioritized over voltage rating.
BU508AF	Higher V_CEO (1000 V), same TO-220F-3SG package, but slower t_F (0.5 µs typ.) and lower f_T (4 MHz)	Better for ultra-high-voltage surge protection; less suitable for high-frequency (>20 kHz) switching	Prefer for 600–1000 V applications where switching speed is secondary to voltage margin.

Compared with MJD127G and BU508AF, the FJPF5021O delivers optimal balance of 500 V rating, 0.1 µs fall time, and TO-220F-3SG insulation - making it the preferred choice for 400 VDC bus switching in cost-sensitive industrial power stages.

Availability

FJPF5021O is available at Aetrix Electronics and suitable for industrial motor drives, AC-DC power supplies, lamp dimmers, and inductive load switching requiring stable component supply and long-term manufacturing continuity.

Supply support for FJPF5021O 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 manufacturer specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The FJPF5021O belongs to onsemi's high-voltage bipolar transistor product line, engineered for rugged, high-reliability switching in mains-connected equipment where voltage margin, SOA robustness, and thermal stability are critical.

FAQ

What is the maximum continuous collector current rating for FJPF5021O?

The FJPF5021O has a maximum continuous collector current (I_C) of 5 A at case temperature T_C = 25°C. This rating decreases with rising case temperature per the derating curve in Figure 8 of the datasheet, reaching zero at T_C = 175°C. For reliable operation above 25°C, heatsinking must be applied to maintain T_C within limits. The FJPF5021O also supports 10 A pulsed collector current (I_CP) under specified duty cycle conditions.

Does FJPF5021O have an insulated package, and how does that affect PCB layout?

Yes, the FJPF5021O uses the TO-220F-3SG (Fullpack) package with an electrically insulated metal tab, designated Case 221AT. This allows direct mounting to a grounded heatsink without requiring insulating washers or pads. In PCB layout, the collector (Pin 2) is internally connected to the tab, so copper pour under the tab must be isolated from other nets unless intentionally tied to collector potential. This insulation simplifies thermal management while maintaining electrical safety in high-voltage designs using the FJPF5021O.

What is the h_FE classification for FJPF5021O, and how is it marked on the device?

The FJPF5021O is h_FE grade "O", indicating a DC current gain range of 20–40 when measured at V_CE = 5 V and I_C = 0.6 A. This grade is marked directly on the device body as the letter "O" in the marking sequence "J5021−OAYWWZZ", located after the device code and before the assembly site code. Designers should account for this gain spread when sizing base drive resistors or current sources for the FJPF5021O to ensure saturation across process and temperature variations.

Can FJPF5021O be used in avalanche-mode switching applications?

No, the FJPF5021O is not rated or characterized for repetitive avalanche operation. Its datasheet specifies only clamped inductive switching parameters (V_CEX(sus) = 500 V) under controlled test conditions with active base drive during turn-off. Unlike dedicated avalanche-rated transistors, the FJPF5021O lacks guaranteed single-pulse or repetitive avalanche energy ratings (E_AS). For designs requiring unclamped inductive switching or energy absorption without external snubbers, a purpose-built avalanche transistor should be selected instead of the FJPF5021O.

Is FJPF5021O RoHS compliant and halogen-free?

Yes, the FJPF5021O is explicitly marked as a Pb-free device in its datasheet and conforms to RoHS Directive 2011/65/EU. onsemi confirms that the FJPF5021O meets JEDEC JS-709B requirements for halogen content, with chlorine and bromine levels below 900 ppm each and total halogens below 1500 ppm. This makes the FJPF5021O suitable for environmentally regulated industrial and consumer products requiring full material compliance documentation.

FJPF5021O Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-220-3 Full Pack

Packaging:: Bulk

Product Status:: Obsolete

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 5 A

Voltage - Collector Emitter Breakdown (Max):: 500 V

Vce Saturation (Max) @ Ib, Ic:: 1V @ 600mA, 3A

Current - Collector Cutoff (Max):: 10µA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 20 @ 600mA, 5V

Power - Max:: 40 W

Frequency - Transition:: 15MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220F-3

FJPF5021O FAQ

1.How can I place an order for FJPF5021O through Aetrix?

Please submit a Request for Quotation (RFQ) for FJPF5021O on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for FJPF5021O reliable?

The price and inventory of FJPF5021O are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FJPF5021O is usually 5 days.

3.What payment methods are accepted for FJPF5021O?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FJPF5021O transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for FJPF5021O?

FJPF5021O orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your FJPF5021O order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for FJPF5021O?

For technical support, including FJPF5021O datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FJPF5021O requirements.

6.How does Aetrix verify that FJPF5021O is sourced from the original manufacturer or authorized distributors?

All FJPF5021O products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that FJPF5021O meets industry standards.

7.What is the process for return or replacement of FJPF5021O?

All FJPF5021O units undergo pre-shipment inspection (PSI). If there is an issue with FJPF5021O, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The FJPF5021O part is unused and in its original packaging.

Return procedure for FJPF5021O:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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