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

onsemi FJP5027TU

Name: FJP5027TU
Brand: onsemi
SKU: FJP5027TU
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: FJP5027TU

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-220-3

Datasheet:: FJP5027TU.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

FJP5027TU 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 SOA and is commonly used in flyback converters, motor controls, and solid-state relays.

For engineers reviewing the FJP5027TU 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 verified safe operating area under inductive load conditions.

Technical Context

The FJP5027TU operates as a high-voltage, medium-current NPN bipolar junction transistor optimized for hard-switched power conversion. Its design supports sustained operation up to 150°C junction temperature, with V_CEX(sus) = 800 V under clamped inductive turn-off (I_C = 1.5 A, I_B1 = –I_B2 = 0.3 A, L = 2 mH).

It exhibits DC current gain h_FE1 = 10–40 (at V_CE = 5 V, I_C = 0.2–1 A), low saturation voltages (V_CE(sat) = 2 V, V_BE(sat) = 1.5 V at I_C = 1.5 A/I_B = 0.3 A), and output capacitance C_ob = 60 pF - enabling predictable switching loss and snubber design in high-frequency SMPS topologies.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	800 V - Enables use in 400 V AC-input offline converters without series stacking
I_C (DC)	3 A - Supports continuous output currents up to ~150 W in single-transistor forward/flyback designs
P_C @ T_C=25°C	50 W - Requires heatsink with ≤1.2°C/W thermal resistance for full-power operation
f_T	15 MHz - Sufficient for switching frequencies up to ~100 kHz with margin for gate drive dynamics
t_ON/t_F	0.5 µs / 0.3 µs - Enables efficient hard-switching in <200 kHz power stages with minimal overlap loss
C_ob	60 pF - Predictable Miller capacitance for gate driver sizing and EMI filter design

Pinout & Package

Package: TO-220 (JEDEC variation AB, 3-lead, through-hole). Standard mounting with tab connected to collector for direct heatsinking.

Pin/Terminal	Circuit Role	Design Meaning
1 (Base)	Control input	Receives base current to saturate transistor; requires ≥0.3 A drive for full 1.5 A conduction
2 (Collector)	High-side power node	Tab-connected terminal; electrically tied to heatsink - must be insulated if heatsink is grounded
3 (Emitter)	Power return path	Serves as common reference for base drive and load return; low-inductance layout critical for switching stability

Key Features

Feature	Design Value
Wide Safe Operating Area (SOA)	Rated for 1.5 A at 800 V with inductive clamping - supports robust overcurrent tolerance in relay/motor drive
High Voltage Sustaining (V_CEX(sus))	800 V under active clamped turn-off - eliminates need for external snubbers in many flyback designs
Fast Switching Speed	Sub-microsecond t_ON/t_F enables high-efficiency operation at 50–100 kHz without excessive switching loss
High Junction Temperature Rating	150°C maximum T_J allows operation in compact enclosures with limited airflow

Applications

Switch-Mode Power Supplies	AC Motor Drives
Use Scenario: Primary-side switch in 60–150 W universal-input flyback converters for industrial power supplies. IC Role / Device Role / Timing Role: High-voltage NPN switching element handling primary current and voltage stress during PWM cycles. Use Value: 800 V V_CEO and wide SOA allow reliable operation across line surges and transformer leakage spikes without derating.	Use Scenario: Half-bridge upper-leg switch in 1/4–1/2 HP single-phase AC induction motor inverters. IC Role / Device Role / Timing Role: Medium-speed switching transistor controlling phase voltage polarity and timing in 1–5 kHz PWM schemes. Use Value: Fast t_ON/t_F and low V_CE(sat) reduce conduction and switching losses during frequent direction changes.
Solid-State Relays	DC-DC Converters
Use Scenario: Output stage in opto-isolated SSRs replacing mechanical contacts in HVAC control panels. IC Role / Device Role / Timing Role: High-reliability power switch isolating control logic from 24–240 V AC/DC loads. Use Value: 150°C T_J rating and 10 µA I_CBO ensure long-term stability under thermal cycling and partial discharge stress.	Use Scenario: Main switch in isolated forward or push-pull DC-DC converters for telecom and industrial 48 V systems. IC Role / Device Role / Timing Role: Primary-side power transistor delivering regulated 3.3–12 V outputs from unregulated 36–75 V inputs. Use Value: 50 W P_C and 60 pF C_ob support stable 200 kHz operation with minimal gate drive power and EMI filtering burden.

Switch-Mode Power Supplies

AC Motor Drives

Use Scenario: Primary-side switch in 60–150 W universal-input flyback converters for industrial power supplies.

IC Role / Device Role / Timing Role: High-voltage NPN switching element handling primary current and voltage stress during PWM cycles.

Use Value: 800 V V_CEO and wide SOA allow reliable operation across line surges and transformer leakage spikes without derating.

Use Scenario: Half-bridge upper-leg switch in 1/4–1/2 HP single-phase AC induction motor inverters.

IC Role / Device Role / Timing Role: Medium-speed switching transistor controlling phase voltage polarity and timing in 1–5 kHz PWM schemes.

Use Value: Fast t_ON/t_F and low V_CE(sat) reduce conduction and switching losses during frequent direction changes.

Solid-State Relays

DC-DC Converters

Use Scenario: Output stage in opto-isolated SSRs replacing mechanical contacts in HVAC control panels.

IC Role / Device Role / Timing Role: High-reliability power switch isolating control logic from 24–240 V AC/DC loads.

Use Value: 150°C T_J rating and 10 µA I_CBO ensure long-term stability under thermal cycling and partial discharge stress.

Use Scenario: Main switch in isolated forward or push-pull DC-DC converters for telecom and industrial 48 V systems.

IC Role / Device Role / Timing Role: Primary-side power transistor delivering regulated 3.3–12 V outputs from unregulated 36–75 V inputs.

Use Value: 50 W P_C and 60 pF C_ob support stable 200 kHz operation with minimal gate drive power and EMI filtering burden.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STN1010	800 V V_CEO, 10 A I_C, TO-220FP package (full-pack), higher f_T (25 MHz)	Higher current capacity suits >200 W designs; FP variant offers improved creepage but lower P_C (30 W)	Select when higher peak current headroom and faster switching are required; verify heatsink compatibility with FP outline
MJD127G	80 V V_CEO, 2 A I_C, TO-220AB, lower voltage rating and smaller SOA	Limited to low-voltage DC-DC or signal amplification; not suitable for AC-line-referenced circuits	Only consider for sub-100 V applications where cost or availability outweighs voltage safety margin requirements

Compared with STN1010 and MJD127G, the FJP5027TU provides optimal balance of 800 V ruggedness, 3 A continuous rating, and proven SOA in legacy industrial power designs - making it preferred for retrofitting and cost-sensitive 60–150 W offline converters where full 10 A capability is unnecessary.

Availability

FJP5027TU is available at Aetrix Electronics and suitable for switch-mode power supplies, AC motor drives, and solid-state relays requiring stable component supply and long-lifecycle support.

Supply support for FJP5027TU 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 industrial, automotive, and computing markets.

The FJP5027TU belongs to ON Semiconductor's high-voltage bipolar transistor product line, engineered specifically for ruggedized switching in offline power conversion and motor control where reliability under voltage transients and thermal stress is critical.

FAQ

What is the maximum continuous collector current rating for the FJP5027TU?

The FJP5027TU 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 - at T_C = 100°C, usable I_C drops to approximately 1.8 A. This rating assumes proper heatsinking and operation within the SOA limits defined in the datasheet.

Does the FJP5027TU have a built-in base-emitter resistor or protection diode?

No, the FJP5027TU is a standard three-terminal NPN bipolar transistor with no integrated base resistors or protection diodes. External base drive circuitry - including current-limiting resistors and optional Baker clamp or flyback diodes - must be implemented per application requirements. Its pinout (Base, Collector, Emitter) and lack of internal components are consistent across all documented FJP5027TU units.

Can the FJP5027TU replace the FJP5027 in existing designs?

Yes, the FJP5027TU is a direct replacement for the FJP5027. Both share identical electrical specifications, pinout, package (TO-220), and thermal characteristics. The "TU" suffix denotes tape-and-reel packaging for automated assembly, while the base part number FJP5027 refers to tube packaging - functionality and performance are fully interchangeable.

What is the safe operating area (SOA) limitation for inductive switching in the FJP5027TU?

The FJP5027TU SOA is specified for clamped inductive switching with V_CEX(sus) = 800 V at I_C = 1.5 A, I_B1 = –I_B2 = 0.3 A, and L = 2 mH. Under these conditions, it sustains repetitive turn-off without secondary breakdown. For unclamped operation, SOA must be strictly limited to the DC or pulsed curves in Figure 6 of the datasheet - exceeding them risks thermal runaway.

Is the FJP5027TU suitable for use in Class II (double-insulated) power supplies?

Yes, the FJP5027TU supports Class II compliance when mounted with appropriate insulation (e.g., silicone pad + insulating washer) between its collector-tab and heatsink. Its 800 V V_CEO and 1100 V V_CBO provide sufficient margin for reinforced insulation requirements in 250 V RMS input designs, provided creepage/clearance distances and PCB layout meet IEC 62368-1 standards.

FJP5027TU Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-220-3

Packaging:: Tube

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:: 10 @ 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

FJP5027TU FAQ

1.How can I place an order for FJP5027TU through Aetrix?

Please submit a Request for Quotation (RFQ) for FJP5027TU 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 FJP5027TU reliable?

The price and inventory of FJP5027TU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FJP5027TU is usually 5 days.

3.What payment methods are accepted for FJP5027TU?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FJP5027TU transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for FJP5027TU?

FJP5027TU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your FJP5027TU 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 FJP5027TU?

For technical support, including FJP5027TU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FJP5027TU requirements.

6.How does Aetrix verify that FJP5027TU is sourced from the original manufacturer or authorized distributors?

All FJP5027TU 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 FJP5027TU meets industry standards.

7.What is the process for return or replacement of FJP5027TU?

All FJP5027TU units undergo pre-shipment inspection (PSI). If there is an issue with FJP5027TU, 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 FJP5027TU part is unused and in its original packaging.

Return procedure for FJP5027TU:

1.Submit a request within 90 days.

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

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