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

onsemi FJE3303H1TU

Name: FJE3303H1TU
Brand: onsemi
SKU: FJE3303H1TU
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: FJE3303H1TU

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-225AA, TO-126-3

Datasheet:: FJE3303H1TU.pdf

Description:: TRANS NPN 400V 1.5A TO-126-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

FJE3303H1TU from ON Semiconductor is a high-voltage, fast-switching NPN power transistor in TO-126 package, rated for 700 V_CB, 400 V_CE, and 1.5 A DC collector current. It delivers 4 MHz gain-bandwidth product, 21 pF output capacitance, and switching times of 1.1 µs (t_ON), 4.0 µs (t_STG), and 0.7 µs (t_F), optimized for electronic ballast and switching regulator circuits.

For engineers reviewing the FJE3303H1TU datasheet, pinout, applications, or equivalent options, key selection criteria include its 400 V_CEO breakdown rating, h_FE classification H1 (8–16 at I_C = 0.5 A), V_CE(sat) ≤ 1.0 V at I_C = 1.0 A / I_B = 0.25 A, and TO-126 thermal performance with 20 W P_C at T_C = 25°C.

Technical Context

The FJE3303H1TU is a silicon bipolar junction transistor designed for high-voltage switching applications where robust avalanche capability and controlled turn-off behavior are required. Its 700 V_CB rating supports operation in flyback and resonant converter topologies with high primary-side voltage stress.

It features a defined h_FE classification (H1) ensuring consistent DC current gain between 8 and 16 at V_CE = 2 V and I_C = 0.5 A, and exhibits low saturation voltage - 0.5 V typical at I_C = 0.5 A / I_B = 0.1 A - enabling efficient drive in medium-power SMPS stages.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	400 V - Maximum safe collector-emitter voltage under open-base condition; defines upper limit for switch-node voltage swing in offline converters.
I_C (DC)	1.5 A - Continuous collector current handling capacity; sets maximum average load current in linear or switching operation.
h_FE (H1)	8–16 - Guaranteed DC current gain range at V_CE = 2 V, I_C = 0.5 A; enables predictable base drive sizing for stable saturation.
V_CE(sat)	≤1.0 V at I_C = 1.0 A / I_B = 0.25 A - Low on-state voltage drop reduces conduction loss and thermal stress in power stage.
f_T	4 MHz - Current gain bandwidth product; indicates usable frequency range for small-signal amplification or high-speed switching control loops.
t_STG	4.0 µs - Storage time under specified resistive-load test conditions (V_CC = 125 V, I_B1 = 0.2 A, I_B2 = −0.2 A); critical for minimizing switching losses during turn-off.
P_C @ T_C = 25°C	20 W - Maximum collector dissipation at case temperature 25°C; determines heatsink requirement for continuous operation.

Pinout & Package

Package: TO-126 (standard leaded plastic power package with emitter-collector-base terminal layout; mechanical drawing MKT-TO126AArev2; terminal length D = 3.45–4.05 mm, E = 6.45–7.45 mm).

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current sink terminal	Low-impedance return path for collector current; connected to ground or low-side reference in common-emitter configuration.
2 (Collector)	High-voltage current source terminal	Connected to primary winding or high-side rail; must withstand up to 400 V_CEO and support 1.5 A continuous conduction.
3 (Base)	Control input terminal	Receives forward bias current to saturate transistor; requires ≥0.25 A peak drive for full 1.0 A collector conduction per datasheet test condition.

Key Features

Feature	Design Value
High-voltage capability	700 V_CB and 400 V_CEO ratings enable direct use in 230 VAC offline flyback and half-bridge primary switches without snubbers.
Fast switching performance	1.1 µs t_ON, 4.0 µs t_STG, and 0.7 µs t_F reduce total switching loss in 20–100 kHz SMPS designs.
H1 h_FE classification	Guaranteed 8–16 DC current gain ensures consistent base drive design across production lots for reliable saturation.
Low V_CE(sat)	0.5 V typical at I_C = 0.5 A / I_B = 0.1 A minimizes conduction loss and improves efficiency in medium-power ballasts.

Applications

Electronic Ballast Control	Switching Regulator Primary Switch
Use Scenario: Driving resonant LC tank in fluorescent lamp ballasts operating from 220–240 VAC mains. IC Role / Device Role / Timing Role: High-voltage NPN switch controlling lamp current via zero-voltage switching (ZVS) topology. Use Value: 400 V_CEO rating and 4.0 µs storage time allow stable ZVS operation at 20–60 kHz without secondary snubbing.	Use Scenario: Primary-side switch in 15–30 W offline flyback converters for industrial power supplies. IC Role / Device Role / Timing Role: Main power switch turning on/off transformer primary to regulate output voltage. Use Value: 20 W P_C and 1.5 A I_C support continuous operation at 25°C case temperature with minimal heatsinking.
DC-DC Converter Topology	AC-DC Adapter Stage
Use Scenario: High-side switch in non-isolated buck-derived DC-DC converters for 12 V to 5 V/3.3 V conversion. IC Role / Device Role / Timing Role: Medium-voltage, medium-current switching element in step-down regulation loop. Use Value: 700 V_CB margin allows safe operation with 200 V transient spikes on input bus.	Use Scenario: Primary switch in universal-input (90–264 VAC) AC-DC adapters for consumer electronics. IC Role / Device Role / Timing Role: Power transistor in quasi-resonant (QR) or fixed-frequency flyback stage. Use Value: H1 h_FE classification ensures repeatable base drive requirements across manufacturing batches.

Electronic Ballast Control

Switching Regulator Primary Switch

Use Scenario: Driving resonant LC tank in fluorescent lamp ballasts operating from 220–240 VAC mains.

IC Role / Device Role / Timing Role: High-voltage NPN switch controlling lamp current via zero-voltage switching (ZVS) topology.

Use Value: 400 V_CEO rating and 4.0 µs storage time allow stable ZVS operation at 20–60 kHz without secondary snubbing.

Use Scenario: Primary-side switch in 15–30 W offline flyback converters for industrial power supplies.

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

Use Value: 20 W P_C and 1.5 A I_C support continuous operation at 25°C case temperature with minimal heatsinking.

DC-DC Converter Topology

AC-DC Adapter Stage

Use Scenario: High-side switch in non-isolated buck-derived DC-DC converters for 12 V to 5 V/3.3 V conversion.

IC Role / Device Role / Timing Role: Medium-voltage, medium-current switching element in step-down regulation loop.

Use Value: 700 V_CB margin allows safe operation with 200 V transient spikes on input bus.

Use Scenario: Primary switch in universal-input (90–264 VAC) AC-DC adapters for consumer electronics.

IC Role / Device Role / Timing Role: Power transistor in quasi-resonant (QR) or fixed-frequency flyback stage.

Use Value: H1 h_FE classification ensures repeatable base drive requirements across manufacturing batches.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN power transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
FJP13007H1TU	Higher V_CEO (600 V), higher I_C (8 A), larger TO-220 package, f_T = 4 MHz same	Supports higher-power flyback and forward converters; not suitable for space-constrained TO-126 layouts	Select when >1.5 A average current or >400 V blocking is required; requires PCB footprint change
MJD13005G	Lower V_CEO (400 V same), lower I_C (1.2 A), TO-252 (DPAK) surface-mount package, h_FE unclassified	Designed for SMT assembly; lacks guaranteed h_FE binning and has reduced pulse current rating (I_CP = 2.4 A vs. 3 A)	Select for automated assembly or thermal pad-compatible layouts; verify gain consistency in production

Compared with FJE3303H1TU, FJP13007H1TU offers higher current and voltage headroom but requires TO-220 re-layout, while MJD13005G enables surface-mount integration at the cost of unclassified h_FE and lower pulse rating - both serve adjacent power tiers but are not pin-compatible replacements.

Availability

FJE3303H1TU is available at Aetrix Electronics and suitable for electronic ballast control, switching regulator primary switching, and DC-DC converter topology applications requiring stable component supply and legacy Fairchild/ON Semiconductor compatibility.

Supply support for FJE3303H1TU 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 connectivity solutions for automotive, industrial, cloud, medical, and IoT applications.

The FJE3303H1TU belongs to ON Semiconductor's legacy high-voltage bipolar transistor product line, originally developed by Fairchild for robust, cost-effective switching in lighting and offline power conversion systems.

FAQ

What is the maximum collector-emitter voltage rating for the FJE3303H1TU?

The FJE3303H1TU has a maximum collector-emitter voltage rating (V_CEO) of 400 V under open-base conditions at T_C = 25°C. This rating is confirmed in the Absolute Maximum Ratings table of the official datasheet (FJE3303 Rev. 2). Exceeding this voltage risks avalanche breakdown and permanent device failure. Derating is required above 25°C case temperature per the power derating curve in Figure 9.

Is the FJE3303H1TU still in active production?

No - the FJE3303H1TU is marked "DISCONTINUED" in the official ON Semiconductor documentation. The datasheet states "THIS DEVICE IS NOT AVAILABLE" and directs users to contact an ON Semiconductor representative for alternatives. Aetrix Electronics maintains limited legacy stock for design continuity, but long-term supply is not assured.

What does the "H1" suffix indicate in FJE3303H1TU?

"H1" denotes the h_FE (DC current gain) classification bin for the FJE3303H1TU. Per the Electrical Characteristics table, H1 devices exhibit h_FE between 8 and 16 when measured at V_CE = 2 V and I_C = 0.5 A. This binning ensures predictable base drive requirements and consistent saturation behavior across units shipped as FJE3303H1TU.

What package type is used for the FJE3303H1TU?

The FJE3303H1TU uses the TO-126 package - a through-hole, single-ended plastic power package with three leads (Emitter, Collector, Base) in standard 1-2-3 order. Mechanical dimensions are defined in drawing MKT-TO126AArev2, with terminal lengths D = 3.45–4.05 mm and E = 6.45–7.45 mm for the TSSTU variant referenced in the datasheet.

Can the FJE3303H1TU be used in place of the FJE3303H2TU?

No - the FJE3303H1TU and FJE3303H2TU differ in h_FE classification: H1 specifies 8–16 gain, while H2 specifies 14–21 gain at the same test conditions. Substituting between them may cause inconsistent base drive, marginal saturation, or excessive base current consumption. They share identical voltage, current, and switching specs, but are not functionally interchangeable without circuit validation.

FJE3303H1TU Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-225AA, TO-126-3

Packaging:: Tube

Product Status:: Last Time Buy

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 1.5 A

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

Vce Saturation (Max) @ Ib, Ic:: 3V @ 500mA, 1.5A

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 8 @ 500mA, 2V

Power - Max:: 20 W

Frequency - Transition:: 4MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-126-3

FJE3303H1TU FAQ

1.How can I place an order for FJE3303H1TU through Aetrix?

Please submit a Request for Quotation (RFQ) for FJE3303H1TU 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 FJE3303H1TU reliable?

The price and inventory of FJE3303H1TU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FJE3303H1TU is usually 5 days.

3.What payment methods are accepted for FJE3303H1TU?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FJE3303H1TU transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for FJE3303H1TU?

FJE3303H1TU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your FJE3303H1TU 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 FJE3303H1TU?

For technical support, including FJE3303H1TU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FJE3303H1TU requirements.

6.How does Aetrix verify that FJE3303H1TU is sourced from the original manufacturer or authorized distributors?

All FJE3303H1TU 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 FJE3303H1TU meets industry standards.

7.What is the process for return or replacement of FJE3303H1TU?

All FJE3303H1TU units undergo pre-shipment inspection (PSI). If there is an issue with FJE3303H1TU, 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 FJE3303H1TU part is unused and in its original packaging.

Return procedure for FJE3303H1TU:

1.Submit a request within 90 days.

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

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