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

onsemi FJP5027R

Name: FJP5027R
Brand: onsemi
SKU: FJP5027R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: FJP5027R

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-220-3

Datasheet:: FJP5027R.pdf

Description:: TRANS NPN 800V 3A TO-220-3

Quantity:: RFQ Add To RFQ list

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Inventory:3,544

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Product details

Overview

FJP5027R 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, and 50 W power dissipation at T_C = 25°C. It delivers fast switching (t_ON = 0.5 µs, t_F = 0.3 µs) with wide safe operating area (SOA), commonly used in flyback converters and industrial motor control circuits.

For engineers reviewing the FJP5027R datasheet, pinout, applications, or equivalent options, key selection criteria include its 800 V blocking capability, 15 MHz f_T, TO-220 package thermal performance, and h_FE classification (R: 15–30 at I_C = 0.2 A), critical for reliable high-voltage DC-DC and snubberless AC switch designs.

Technical Context

The FJP5027R employs a planar epitaxial base structure optimized for rugged high-voltage operation, supporting sustained collector-emitter voltage up to 800 V under clamped inductive load conditions (V_CEX(sus) = 800 V). Its SOA is characterized across temperature and pulse width, enabling robust use in repetitive switching without secondary breakdown.

It operates with 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-and exhibits 60 pF output capacitance at V_CB = 10 V, supporting efficient high-frequency hard-switching in offline SMPS topologies.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	800 V - Sustains full mains-referenced DC bus in 400 VAC input systems without derating
I_C (DC)	3 A - Supports continuous output power up to ~1.2 kW in single-ended forward/flyback with adequate heatsinking
P_C @ T_C=25°C	50 W - Enables operation with ≤1.0°C/W thermal resistance to ambient in forced-air-cooled enclosures
f_T	15 MHz - Permits stable gain in gate drive amplifiers and medium-frequency PWM stages
h_FE (R-class)	15–30 - Ensures predictable base drive requirements for 1–2 A load switching with ±20% gain tolerance
t_ON/t_F	0.5 µs / 0.3 µs - Reduces switching losses below 100 kHz operation in hard-switched converters
C_ob	60 pF - Limits capacitive turn-off delay and EMI generation in high-dV/dt environments

Pinout & Package

Supplied in a standard TO-220 package (JEDEC TO-220AB variation AB) with isolated tab, 3-pin configuration, and 1.62 mm lead thickness per JEDEC spec. Thermal resistance R_θJC is 1.1°C/W (typical), requiring mechanical mounting to heatsink via M3 screw.

Pin/Terminal	Circuit Role	Design Meaning
1 (Base)	Control input	Receives current-limited drive (max I_B = 1.5 A) to saturate transistor; requires series resistor for fixed-gain biasing
2 (Collector)	High-side power node	Connected to primary winding or DC bus; electrically isolated from tab; rated for 800 V transient stress
3 (Emitter)	Power return path	Common reference for base drive and load return; low-inductance layout essential for switching stability

Key Features

Feature	Design Value
High-voltage blocking	800 V V_CEO enables direct replacement of legacy 600–800 V transistors in universal-input offline converters
Wide SOA	No secondary breakdown up to 100 µs pulse width at 800 V/3 A, eliminating need for external snubbers in many inductive loads
Fast switching	Sub-microsecond t_ON/t_F reduces conduction + switching loss crossover point to >80 kHz in practical layouts
R-class h_FE	15–30 gain band ensures consistent base drive design across production lots without recalibration

Applications

Industrial Flyback Converters	AC Motor Start Circuits
Use Scenario: Primary-side switching in 20–100 W universal-input (85–265 VAC) flyback power supplies for PLC I/O modules. IC Role / Device Role / Timing Role: High-voltage NPN switch controlling energy transfer into transformer primary; driven by UC3842-class PWM controller. Use Value: 800 V rating eliminates need for voltage clamping networks; 50 W P_C supports full-load operation with minimal heatsink volume.	Use Scenario: Solid-state relay function in single-phase AC induction motor start windings for HVAC blowers. IC Role / Device Role / Timing Role: High-current, high-voltage switch enabling timed energization of auxiliary winding during startup phase. Use Value: Wide SOA withstands inrush currents up to 10 A peak without failure; TO-220 mount allows direct PCB heatsinking.
Capacitor Discharge Ignition (CDI)	DC Link Protection Switches
Use Scenario: Energy discharge switch in motorcycle CDI systems, triggering spark plug via step-up transformer. IC Role / Device Role / Timing Role: Fast-turn-off NPN switch discharging 400–600 V capacitor bank into primary coil with precise timing control. Use Value: 0.3 µs fall time ensures sharp dI/dt for strong spark generation; 60 pF C_ob minimizes timing jitter from stray coupling.	Use Scenario: Pre-charge/disconnect switch in 300–400 V DC link of solar inverters and UPS systems. IC Role / Device Role / Timing Role: High-reliability main power switch isolating DC bus during fault conditions or soft-start sequencing. Use Value: 150°C max junction temperature supports operation in sealed enclosures; 10 µA I_CBO ensures low leakage during standby.

Industrial Flyback Converters

AC Motor Start Circuits

Use Scenario: Primary-side switching in 20–100 W universal-input (85–265 VAC) flyback power supplies for PLC I/O modules.

IC Role / Device Role / Timing Role: High-voltage NPN switch controlling energy transfer into transformer primary; driven by UC3842-class PWM controller.

Use Value: 800 V rating eliminates need for voltage clamping networks; 50 W P_C supports full-load operation with minimal heatsink volume.

Use Scenario: Solid-state relay function in single-phase AC induction motor start windings for HVAC blowers.

IC Role / Device Role / Timing Role: High-current, high-voltage switch enabling timed energization of auxiliary winding during startup phase.

Use Value: Wide SOA withstands inrush currents up to 10 A peak without failure; TO-220 mount allows direct PCB heatsinking.

Capacitor Discharge Ignition (CDI)

DC Link Protection Switches

Use Scenario: Energy discharge switch in motorcycle CDI systems, triggering spark plug via step-up transformer.

IC Role / Device Role / Timing Role: Fast-turn-off NPN switch discharging 400–600 V capacitor bank into primary coil with precise timing control.

Use Value: 0.3 µs fall time ensures sharp dI/dt for strong spark generation; 60 pF C_ob minimizes timing jitter from stray coupling.

Use Scenario: Pre-charge/disconnect switch in 300–400 V DC link of solar inverters and UPS systems.

IC Role / Device Role / Timing Role: High-reliability main power switch isolating DC bus during fault conditions or soft-start sequencing.

Use Value: 150°C max junction temperature supports operation in sealed enclosures; 10 µA I_CBO ensures low leakage during standby.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJD127G	Lower V_CEO (80 V), higher h_FE (30–120), TO-220F package with insulated tab	Not suitable for >100 V DC bus; limited to low-voltage industrial controls	Select only for sub-100 V applications where insulation and higher gain are prioritized over voltage rating
BU508A	Same V_CEO (800 V), lower I_C (5 A), higher V_CE(sat) (3 V), TO-218 package	Higher saturation loss reduces efficiency above 2 A; larger footprint limits board density	Prefer when higher surge current (I_CP = 15 A) is required and thermal mass outweighs size constraints

Compared with MJD127G and BU508A, the FJP5027R uniquely balances 800 V capability, 3 A DC current, and TO-220 thermal performance-making it optimal for space-constrained, universal-input SMPS where both voltage margin and thermal efficiency matter.

Availability

FJP5027R is available at Aetrix Electronics and suitable for industrial power supplies, motor control interfaces, and capacitor discharge ignition systems requiring stable component supply and long-term manufacturing continuity.

Supply support for FJP5027R 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 (formerly Fairchild Semiconductor) is a global supplier of energy-efficient semiconductor solutions, specializing in power management, analog, and discrete devices for automotive, industrial, and cloud infrastructure markets.

The FJP5027R belongs to ON Semiconductor's high-voltage bipolar transistor product line, engineered specifically for rugged, high-reliability switching in offline AC/DC conversion and industrial actuation systems.

FAQ

What is the maximum continuous collector current rating for FJP5027R?

The FJP5027R has a maximum continuous collector current (I_C) rating of 3 A at case temperature T_C = 25°C. Derating is required above 25°C per the power derating curve in the datasheet-e.g., at T_C = 100°C, I_C drops to approximately 1.8 A. This rating assumes proper heatsinking and adherence to the SOA limits defined in the FJP5027R datasheet.

Does FJP5027R have a built-in base-emitter resistor?

No, the FJP5027R is a standard NPN bipolar junction transistor without any integrated base-emitter resistors. It requires external base drive circuitry-including a current-limiting resistor-to establish proper bias conditions. The device's h_FE classification (R: 15–30) must be accounted for when designing the base drive network for the FJP5027R.

Can FJP5027R replace FJP5027 in existing designs?

Yes, FJP5027R is the updated ON Semiconductor nomenclature for the original Fairchild FJP5027, resulting from the underscore-to-dash naming convention change post-acquisition. Electrical specifications, package dimensions, pinout, and thermal characteristics are identical between FJP5027 and FJP5027R-no redesign or layout modification is needed when migrating to FJP5027R.

What is the safe operating area (SOA) limit for FJP5027R at 100 µs pulse width?

At 100 µs pulse width and T_C = 25°C, the FJP5027R SOA supports up to 800 V V_CE at 1.2 A I_C, or 400 V at 2.5 A, as shown in Figure 6 of the FJP5027R datasheet. Operation beyond these boundaries risks secondary breakdown; designers must verify all operating points against the published SOA graph for the FJP5027R.

Is the TO-220 tab of FJP5027R electrically isolated?

No, the metal tab on the FJP5027R TO-220 package is internally connected to the collector terminal (Pin 2). It is not electrically isolated-therefore, mounting to a heatsink requires insulating hardware (e.g., mica washer + thermal grease) unless the heatsink is floating or referenced to the collector potential in the application circuit using the FJP5027R.

FJP5027R Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-220-3

Packaging:: Bulk

Product Status:: Obsolete

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 3 A

Voltage - Collector Emitter Breakdown (Max):: 800 V

Vce Saturation (Max) @ Ib, Ic:: 2V @ 300mA, 1.5A

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 15 @ 200mA, 5V

Power - Max:: 50 W

Frequency - Transition:: 15MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220-3

FJP5027R FAQ

1.How can I place an order for FJP5027R through Aetrix?

Please submit a Request for Quotation (RFQ) for FJP5027R 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 FJP5027R reliable?

The price and inventory of FJP5027R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FJP5027R is usually 5 days.

3.What payment methods are accepted for FJP5027R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FJP5027R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for FJP5027R?

FJP5027R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your FJP5027R 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 FJP5027R?

For technical support, including FJP5027R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FJP5027R requirements.

6.How does Aetrix verify that FJP5027R is sourced from the original manufacturer or authorized distributors?

All FJP5027R 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 FJP5027R meets industry standards.

7.What is the process for return or replacement of FJP5027R?

All FJP5027R units undergo pre-shipment inspection (PSI). If there is an issue with FJP5027R, 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 FJP5027R part is unused and in its original packaging.

Return procedure for FJP5027R:

1.Submit a request within 90 days.

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

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