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

onsemi FJPF5021Y

Name: FJPF5021Y
Brand: onsemi
SKU: FJPF5021Y
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: FJPF5021Y

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-220-3 Full Pack

Datasheet:: FJPF5021Y.pdf

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

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Product details

Overview

FJPF5021Y from onsemi is an NPN silicon power transistor in TO-220 Fullpack package, rated for 500 V V_CEO, 5 A I_C, and 40 W P_C at T_C = 25°C, designed for high-voltage switching in industrial motor drives and SMPS primary-side circuits.

For engineers reviewing the FJPF5021Y datasheet, pinout, applications, or equivalent options, key selection criteria include its 500 V sustaining voltage under clamped inductive switching (V_CEX(sus)), 0.1 µs typical fall time, wide forward/reverse SOA, Pb-free construction, and h_FE grade Y (30–50 at I_C = 0.6 A).

Technical Context

This device operates as a single NPN bipolar junction transistor with base-controlled current amplification. Its design supports high-voltage, medium-current switching where ruggedness under inductive load transients is critical - evidenced by V_CEX(sus) = 500 V at I_C = 2.5 A with symmetrical ±1 A base drive and 1 mH clamp inductance.

It features low saturation voltages (V_CE(sat) ≤ 1 V, V_BE(sat) ≤ 1.5 V at I_C = 3 A / I_B = 0.6 A) and moderate gain bandwidth (f_T = 15 MHz), balancing switching speed and drive simplicity in hard-switched topologies.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	500 V - Maximum collector-emitter voltage before breakdown under open-base condition; enables use in 400 V DC bus applications.
I_C (DC)	5 A - Continuous collector current rating; defines steady-state thermal limit with adequate heatsinking.
P_C (T_C = 25°C)	40 W - Maximum power dissipation at case temperature 25°C; derates linearly above 25°C per Figure 8.
t_F (Typ.)	0.1 µs - Typical fall time under specified test conditions; supports switching frequencies up to ~1 MHz in optimized circuits.
h_FE (Grade Y)	30–50 - DC current gain range at V_CE = 5 V, I_C = 0.6 A; determines required base drive current for saturation.
C_ob	80 pF - Output capacitance at V_CB = 10 V; impacts turn-off losses and EMI in high-dv/dt environments.

Pinout & Package

Package: TO-220 Fullpack (Case 221AT), 3-lead, through-hole, insulated tab, vertical mounting orientation.

Pin/Terminal	Circuit Role	Design Meaning
1 (Base)	Control input terminal	Receives base current to bias transistor into active/saturation; requires ≥0.6 A for full saturation at I_C = 3 A.
2 (Collector)	High-side current path	Connected to high-voltage rail (up to 500 V); electrically tied to metal tab in TO-220 Fullpack variant.
3 (Emitter)	Low-side return path	Serves as common reference for base drive and load return; must be routed with low inductance in switching applications.

Key Features

Feature	Design Value
High-voltage sustaining capability	V_CEX(sus) = 500 V under clamped inductive switching - enables robust operation in flyback and forward converter primary switches.
Wide Forward SOA	Supports DC and pulse operation up to 5 A/500 V without secondary breakdown - reduces need for snubbers in hard-switched designs.
Fast switching performance	t_F = 0.1 µs (typ.), t_ON ≤ 0.5 µs - minimizes switching losses in high-frequency SMPS and motor control inverters.
Pb-free construction	RoHS-compliant packaging - meets environmental compliance requirements for industrial and consumer end equipment.

Applications

Industrial Motor Drives	AC-DC Switching Power Supplies
Use Scenario: Driving gate of IGBTs or MOSFETs in three-phase inverter stages, or directly switching inductive loads up to 5 A at 400 V DC bus. IC Role / Device Role / Timing Role: NPN power switch providing isolated base drive amplification or direct high-side switching in half-bridge configurations. Use Value: Wide SOA and 500 V V_CEX(sus) ensure reliable commutation under short-circuit and overload conditions without desaturation.	Use Scenario: Primary-side switching transistor in offline flyback or forward converters delivering up to 200 W output power. IC Role / Device Role / Timing Role: High-voltage NPN switch controlling energy transfer from AC line to transformer primary winding. Use Value: 0.1 µs t_F and low V_CE(sat) reduce conduction and switching losses, improving efficiency at 65–100 kHz operating frequencies.
Inductive Load Drivers	High-Voltage DC-DC Converters
Use Scenario: Controlling solenoids, relays, and electromagnetic actuators in factory automation systems with 24–48 V control logic and 300–400 V supply rails. IC Role / Device Role / Timing Role: Medium-power NPN switch interfacing microcontroller GPIO to high-energy inductive loads. Use Value: High I_CP = 10 A pulse rating and robust reverse-bias SOA prevent failure during inductive kickback events.	Use Scenario: Step-up (boost) or step-down (buck) switching element in isolated telecom or industrial DC-DC modules operating from 200–400 V input. IC Role / Device Role / Timing Role: Main power switch handling high input voltage and medium output current in non-isolated or auxiliary regulation stages. Use Value: 800 V V_CBO margin allows safe operation with voltage spikes up to 600 V in unregulated HV DC rails.

Industrial Motor Drives

AC-DC Switching Power Supplies

Use Scenario: Driving gate of IGBTs or MOSFETs in three-phase inverter stages, or directly switching inductive loads up to 5 A at 400 V DC bus.

IC Role / Device Role / Timing Role: NPN power switch providing isolated base drive amplification or direct high-side switching in half-bridge configurations.

Use Value: Wide SOA and 500 V V_CEX(sus) ensure reliable commutation under short-circuit and overload conditions without desaturation.

Use Scenario: Primary-side switching transistor in offline flyback or forward converters delivering up to 200 W output power.

IC Role / Device Role / Timing Role: High-voltage NPN switch controlling energy transfer from AC line to transformer primary winding.

Use Value: 0.1 µs t_F and low V_CE(sat) reduce conduction and switching losses, improving efficiency at 65–100 kHz operating frequencies.

Inductive Load Drivers

High-Voltage DC-DC Converters

Use Scenario: Controlling solenoids, relays, and electromagnetic actuators in factory automation systems with 24–48 V control logic and 300–400 V supply rails.

IC Role / Device Role / Timing Role: Medium-power NPN switch interfacing microcontroller GPIO to high-energy inductive loads.

Use Value: High I_CP = 10 A pulse rating and robust reverse-bias SOA prevent failure during inductive kickback events.

Use Scenario: Step-up (boost) or step-down (buck) switching element in isolated telecom or industrial DC-DC modules operating from 200–400 V input.

IC Role / Device Role / Timing Role: Main power switch handling high input voltage and medium output current in non-isolated or auxiliary regulation stages.

Use Value: 800 V V_CBO margin allows safe operation with voltage spikes up to 600 V in unregulated HV DC rails.

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
ST13007	V_CEO = 400 V, I_C = 8 A, P_C = 100 W, TO-220 package	Lower voltage rating but higher current and power; wider SOA at lower V_CE	Preferred where 400 V max system voltage suffices and higher continuous current is needed.
MJD127G	V_CEO = 100 V, I_C = 5 A, P_C = 30 W, DPAK package	Lower voltage, surface-mount, lower power dissipation; not suitable for >200 V applications	Only viable for low-voltage DC-DC or automotive body electronics; not a functional substitute for FJPF5021Y's 500 V capability.

Compared with ST13007 and MJD127G, the FJPF5021Y uniquely balances 500 V blocking, 5 A DC current, and fast 0.1 µs fall time in a through-hole TO-220 Fullpack - making it optimal for cost-sensitive, high-reliability 400 V industrial SMPS where voltage margin and ruggedness outweigh raw power density.

Availability

FJPF5021Y is available at Aetrix Electronics and suitable for industrial motor drives, AC-DC switching power supplies, inductive load drivers, and high-voltage DC-DC converters requiring stable component supply and long-term manufacturability.

Supply support for FJPF5021Y 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 IoT applications.

The FJPF5021Y belongs to onsemi's high-voltage bipolar transistor product line, engineered for rugged, high-reliability switching in industrial power conversion and motor control systems where voltage margin and transient robustness are critical.

FAQ

What is the maximum collector-emitter voltage rating for FJPF5021Y?

The FJPF5021Y has a maximum collector-emitter voltage (V_CEO) rating of 500 V at T_C = 25°C with base open. Its sustaining voltage under clamped inductive switching (V_CEX(sus)) is also rated at 500 V with I_C = 2.5 A and symmetrical ±1 A base drive. This makes the FJPF5021Y suitable for 400 V DC bus applications with sufficient safety margin. Exceeding 500 V risks irreversible breakdown.

Does FJPF5021Y have a built-in base-emitter resistor or protection diode?

No, the FJPF5021Y is a standard three-terminal NPN bipolar transistor without integrated base resistors or protection diodes. It requires external base drive circuitry - including current-limiting resistors and, in inductive applications, a reverse-biased flyback diode across the base-emitter junction for protection against negative transients. The FJPF5021Y datasheet confirms no internal protection elements are present.

What is the hFE grade indicated by the 'Y' suffix in FJPF5021Y?

The 'Y' suffix in FJPF5021Y denotes h_FE Grade Y, specifying a DC current gain range of 30–50 when measured at V_CE = 5 V and I_C = 0.6 A. This grade ensures predictable base drive requirements for saturation - for example, achieving I_C = 3 A requires I_B ≥ 60 mA minimum, assuming h_FE ≥ 30. The marking diagram on page 1 of the datasheet confirms this classification.

Can FJPF5021Y be used in surface-mount designs?

No, the FJPF5021Y is only offered in the through-hole TO-220 Fullpack (Case 221AT) package. It is not available in surface-mount variants such as DPAK or IPAK. For SMT-compatible alternatives with similar voltage/current ratings, engineers should evaluate other onsemi parts like the MJD127G (100 V) or consider discrete SMT bipolar families from competing manufacturers - but none match the exact 500 V/5 A specification in SMT form.

What thermal derating applies to FJPF5021Y above 25°C case temperature?

The FJPF5021Y's maximum collector power dissipation (P_C) derates linearly above T_C = 25°C at 0.32 W/°C, as shown in Figure 8 of the datasheet. At T_C = 100°C, the allowable P_C drops to approximately 16 W. Effective heatsinking is essential to maintain junction temperature below 150°C, especially under continuous 5 A operation. Thermal resistance R_θJC is not explicitly listed but can be inferred from derating slope and maximum ratings.

FJPF5021Y 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:: 30 @ 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

FJPF5021Y FAQ

1.How can I place an order for FJPF5021Y through Aetrix?

Please submit a Request for Quotation (RFQ) for FJPF5021Y 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 FJPF5021Y reliable?

The price and inventory of FJPF5021Y are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FJPF5021Y is usually 5 days.

3.What payment methods are accepted for FJPF5021Y?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FJPF5021Y transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for FJPF5021Y?

FJPF5021Y orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your FJPF5021Y 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 FJPF5021Y?

For technical support, including FJPF5021Y datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FJPF5021Y requirements.

6.How does Aetrix verify that FJPF5021Y is sourced from the original manufacturer or authorized distributors?

All FJPF5021Y 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 FJPF5021Y meets industry standards.

7.What is the process for return or replacement of FJPF5021Y?

All FJPF5021Y units undergo pre-shipment inspection (PSI). If there is an issue with FJPF5021Y, 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 FJPF5021Y part is unused and in its original packaging.

Return procedure for FJPF5021Y:

1.Submit a request within 90 days.

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

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