Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

onsemi FJP3305H2

Name: FJP3305H2
Brand: onsemi
SKU: FJP3305H2
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: FJP3305H2

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-220-3

Datasheet:: FJP3305H2.pdf

Description:: TRANS NPN 400V 4A TO-220-3

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:7,482

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

FJP3305H2 from ON Semiconductor is a high-voltage, fast-switching NPN power transistor in TO-220 package, rated for 400 V V_CEO, 4 A DC collector current, and 75 W power dissipation at T_C = 25°C. It delivers h_FE of 26–35 at I_C = 2 A and V_CE = 5 V, with t_ON/t_STG/t_F of 0.8/4.0/0.9 ms under specified switching conditions, and is used in electronic ballasts and offline switching regulators.

For engineers reviewing the FJP3305H2 datasheet, pinout, applications, or equivalent options, key selection criteria include its 400 V breakdown rating, 4 A continuous current capability, TO-220 thermal performance, h_FE classification H2 (26–35), and suitability for high-voltage flyback and resonant lamp control circuits.

Technical Context

The FJP3305H2 is a silicon planar epitaxial NPN bipolar junction transistor optimized for high-voltage switching in inductive load applications. Its design emphasizes low saturation voltage (V_CE(sat) = 0.6 V at I_C = 2 A, I_B = 0.5 A) and controlled switching timing (t_STG = 4.0 ms dominant), enabling stable operation in 20–50 kHz electronic ballast drivers.

It features a reverse-biased safe operating area (RBSOA) rated to 500 V and 2 A for 5 ms pulses, and forward-biased SOA supporting 4 A DC at V_CE ≤ 20 V with proper heatsinking. Cob = 65 pF at V_CB = 10 V enables predictable gate drive interaction in half-bridge configurations.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	400 V - Supports operation in 230 VAC mains-derived topologies with ≥100% safety margin
I_C (DC)	4 A - Sustains continuous conduction in 60–100 W ballast and SMPS output stages
P_C @ T_C = 25°C	75 W - Requires minimum 1.5°C/W heatsink for 50°C ambient, TO-220 footprint
h_FE (H2 grade)	26–35 @ V_CE = 5 V, I_C = 2 A - Enables stable base drive design with 0.5 A peak IB for 2 A IC
t_STG	4.0 ms @ V_CC = 125 V, I_C = 2 A - Dominant storage time limits max switching frequency to ~50 kHz in hard-switched apps
C_ob	65 pF @ V_CB = 10 V, f = 1 MHz - Defines Miller capacitance impact on turn-off dv/dt and gate driver loading

Pinout & Package

Package: TO-220AB (JEDEC standard, 3-lead, through-hole, isolated tab). Pin 1 = Base, Pin 2 = Collector (tab-connected), Pin 3 = Emitter.

Pin/Terminal	Circuit Role	Design Meaning
1 (Base)	Control input	Receives current-limited drive signal; requires ≥0.5 A peak for full saturation at I_C = 2 A
2 (Collector)	High-side switched node	Internally connected to metal tab; must be electrically isolated from heatsink unless common-collector config
3 (Emitter)	Reference return path	Serves as current sink reference; layout must minimize inductance to avoid switching oscillation

Key Features

Feature	Design Value
High V_CEO rating	400 V enables direct use in 230 VAC rectified bus (≈325 VDC) with 23% margin for transients
H2 h_FE binning	Guaranteed 26–35 gain ensures consistent base drive requirements across production lots
Low V_CE(sat)	0.6 V @ I_C = 2 A reduces conduction loss to <1.2 W, improving thermal efficiency in linear-regulated stages
Controlled t_STG	4.0 ms storage time supports reliable zero-voltage switching (ZVS) initiation in resonant ballast designs
TO-220 thermal interface	Tab-mounted collector allows direct heatsink mounting with thermal resistance as low as 1.0°C/W (with compound)

Applications

Electronic Ballast Control	Switching Regulator Output Stage
Use Scenario: Driving parallel fluorescent lamps in 20–60 W magnetic-core replacement systems. IC Role / Device Role / Timing Role: Main switch in half-bridge inverter stage, operating at 25–45 kHz with phase-shifted base drive. Use Value: 400 V V_CEO withstands lamp ignition spikes up to 1.5× V_bus; 4 ms t_STG aligns with ZVS timing windows in resonant tank designs.	Use Scenario: Primary-side switch in 30–80 W offline flyback converters for industrial power supplies. IC Role / Device Role / Timing Role: High-voltage switching element handling rectified 230 VAC input, gated by UC384x controller. Use Value: 75 W P_C rating supports 4 A peak current during transient loads; TO-220 package enables cost-effective heatsinking.
DC Motor Commutation	Induction Heating Half-Bridge
Use Scenario: Brushed DC motor driver in HVAC blower modules requiring 24–48 V input and 3–5 A stall current. IC Role / Device Role / Timing Role: Low-side switch in H-bridge configuration, PWM-controlled at 1–20 kHz. Use Value: 4 A I_C rating covers motor stall; V_CE(sat) ≤ 0.6 V minimizes heat generation during continuous conduction mode.	Use Scenario: Switching element in 100–200 kHz series-resonant half-bridge for small-appliance induction cooktops. IC Role / Device Role / Timing Role: Fast-switching NPN in complementary pair with PNP device, driven by transformer-coupled gate signals. Use Value: 65 pF C_ob limits Miller-induced turn-on risk; 400 V rating accommodates 300 VDC bus with ringing margin.

Electronic Ballast Control

Switching Regulator Output Stage

Use Scenario: Driving parallel fluorescent lamps in 20–60 W magnetic-core replacement systems.

IC Role / Device Role / Timing Role: Main switch in half-bridge inverter stage, operating at 25–45 kHz with phase-shifted base drive.

Use Value: 400 V V_CEO withstands lamp ignition spikes up to 1.5× V_bus; 4 ms t_STG aligns with ZVS timing windows in resonant tank designs.

Use Scenario: Primary-side switch in 30–80 W offline flyback converters for industrial power supplies.

IC Role / Device Role / Timing Role: High-voltage switching element handling rectified 230 VAC input, gated by UC384x controller.

Use Value: 75 W P_C rating supports 4 A peak current during transient loads; TO-220 package enables cost-effective heatsinking.

DC Motor Commutation

Induction Heating Half-Bridge

Use Scenario: Brushed DC motor driver in HVAC blower modules requiring 24–48 V input and 3–5 A stall current.

IC Role / Device Role / Timing Role: Low-side switch in H-bridge configuration, PWM-controlled at 1–20 kHz.

Use Value: 4 A I_C rating covers motor stall; V_CE(sat) ≤ 0.6 V minimizes heat generation during continuous conduction mode.

Use Scenario: Switching element in 100–200 kHz series-resonant half-bridge for small-appliance induction cooktops.

IC Role / Device Role / Timing Role: Fast-switching NPN in complementary pair with PNP device, driven by transformer-coupled gate signals.

Use Value: 65 pF C_ob limits Miller-induced turn-on risk; 400 V rating accommodates 300 VDC bus with ringing margin.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJD3305G	Same die, DPAK package (surface-mount); lower P_C = 35 W; no isolated tab	Requires PCB copper area for thermal management; unsuitable for >2 A continuous without forced air	Select when space-constrained PCB layout favors SMT and power <25 W
FJP3305T	Identical specs, TO-220F (full-pack) variant with insulated tab; same h_FE H2 bin	Enables direct heatsink mounting without insulator kit; identical electrical behavior	Select when mechanical isolation from heatsink is required without additional hardware

Compared with MJD3305G and FJP3305T, the FJP3305H2 offers the highest power handling (75 W) in a standard TO-220AB package with non-insulated tab-making it optimal for legacy through-hole designs where thermal mass and ease of heatsink attachment are prioritized over SMT density or insulation.

Availability

FJP3305H2 is available at Aetrix Electronics and suitable for electronic ballast control, offline switching regulator output stages, and DC motor commutation requiring stable component supply and long-term industrial availability.

Supply support for FJP3305H2 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 logic solutions for automotive, industrial, cloud, and consumer markets.

The FJP3305H2 belongs to ON Semiconductor's legacy high-voltage bipolar transistor product line, originally developed by Fairchild for robust, cost-effective switching in lighting and power conversion systems requiring >400 V capability and TO-220 thermal reliability.

FAQ

What is the h_FE range for FJP3305H2?

The FJP3305H2 is binned to the H2 gain group, guaranteeing a DC current gain (h_FE) of 26 to 35 when measured at V_CE = 5 V and I_C = 2 A. This tighter specification than the base FJP3305 (H1: 19–28) improves consistency in base drive design across production units. The FJP3305H2 datasheet confirms this classification on page 2 under "hFE Classification".

Is FJP3305H2 still recommended for new designs?

No-FJP3305H2 is marked DISCONTINUED and NOT RECOMMENDED FOR NEW DESIGN per the official ON Semiconductor datasheet revision 2. While active inventory remains available at Aetrix Electronics for legacy repair and continuity support, ON Semiconductor advises contacting their representative for approved replacements. The FJP3305H2 remains fully functional and supported for existing production runs.

What is the maximum allowable case temperature for FJP3305H2?

The FJP3305H2 has a maximum junction temperature (T_J) of 150°C and a storage temperature range of –65°C to +150°C. Its thermal derating curve (Figure 11) shows linear reduction of P_C above 25°C case temperature, reaching 0 W at T_C = 175°C. For reliable operation, keep T_C ≤ 100°C using appropriate heatsinking. The FJP3305H2 datasheet specifies these limits in the Absolute Maximum Ratings table on page 1.

Does FJP3305H2 have an insulated tab?

No-the FJP3305H2 uses the standard TO-220AB package with a non-insulated metal tab electrically connected to the collector (Pin 2). Electrical isolation from the heatsink requires a mica or silicone insulator kit plus shoulder washers. For insulated-tab alternatives, consider the FJP3305T (TO-220F) variant, which shares identical electrical specs but features a fully insulated package. This distinction is documented in the package outline drawing on page 5 of the FJP3305H2 datasheet.

What are the key switching timing parameters of FJP3305H2?

The FJP3305H2 specifies t_ON = 0.8 ms, t_STG = 4.0 ms, and t_F = 0.9 ms under test conditions of V_CC = 125 V, I_C = 2 A, R_L = 62.5 Ω, and I_B1 = –I_B2 = 0.4 A. Storage time (t_STG) dominates total switching delay, limiting practical hard-switching frequency to ≤50 kHz. These values are confirmed in the Electrical Characteristics table on page 2 of the FJP3305H2 datasheet.

FJP3305H2 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):: 4 A

Voltage - Collector Emitter Breakdown (Max):: 400 V

Vce Saturation (Max) @ Ib, Ic:: 1V @ 1A, 4A

Current - Collector Cutoff (Max):: 1µA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 26 @ 1A, 5V

Power - Max:: 75 W

Frequency - Transition:: 4MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220-3

FJP3305H2 FAQ

1.How can I place an order for FJP3305H2 through Aetrix?

Please submit a Request for Quotation (RFQ) for FJP3305H2 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 FJP3305H2 reliable?

The price and inventory of FJP3305H2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FJP3305H2 is usually 5 days.

3.What payment methods are accepted for FJP3305H2?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FJP3305H2 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for FJP3305H2?

FJP3305H2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your FJP3305H2 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 FJP3305H2?

For technical support, including FJP3305H2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FJP3305H2 requirements.

6.How does Aetrix verify that FJP3305H2 is sourced from the original manufacturer or authorized distributors?

All FJP3305H2 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 FJP3305H2 meets industry standards.

7.What is the process for return or replacement of FJP3305H2?

All FJP3305H2 units undergo pre-shipment inspection (PSI). If there is an issue with FJP3305H2, 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 FJP3305H2 part is unused and in its original packaging.

Return procedure for FJP3305H2:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…