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onsemi FJN13003BU
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- Part No.:
- FJN13003BU
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
FJN13003BU.pdf
- Description:
- TRANS NPN 400V 1.5A TO-92-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,295
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Product details
Overview
FJN13003BU from Fairchild Semiconductor is an NPN silicon planar transistor designed for high-voltage switching applications, with 700 V collector-base breakdown voltage (BVCBO), 400 V collector-emitter breakdown voltage (BVCEO), and 1.5 A DC collector current rating. It operates up to 150°C junction temperature and is used in electronic ballasts up to 21 W.
For engineers reviewing the FJN13003BU datasheet, pinout, applications, or equivalent options, key selection criteria include safe operating area under resistive load switching, saturation voltage at defined IC/IB ratios, and thermal derating behavior across ambient temperatures.
Technical Context
The FJN13003BU employs a planar silicon structure optimized for high-voltage switching, supporting fast turn-on (1.1 µs) and fall (0.7 µs) times under 125 V/1 A resistive load conditions. Its DC current gain (hFE) ranges from 5 to 21 depending on collector current and bias conditions, and it maintains stable saturation performance up to 1.5 A with base drive of 0.5 A.
Designed for operation in electronic ballast circuits, the device features forward and reverse bias safe operating area (SOA) curves validated at multiple ambient temperatures. Its TO-92 package enables compact mounting while requiring attention to power derating above 25°C ambient due to 1.1 W maximum dissipation at Ta = 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCBO | 700 V - Maximum reverse voltage sustainable between collector and base before breakdown |
| VCEO | 400 V - Maximum collector-emitter voltage under open-base condition, defining high-side switch capability |
| IC (DC) | 1.5 A - Continuous collector current limit determining steady-state power handling in linear or switching modes |
| VCE(sat) @ IC=1.5A | 3.0 V - Saturation voltage at full rated current, directly impacting conduction loss and thermal rise |
| fT | 4 MHz - Current gain bandwidth product indicating usable frequency range for small-signal amplification |
| tON / tF | 1.1 µs / 0.7 µs - Switching speed metrics critical for minimizing transition losses in SMPS and ballast drivers |
| TJ max | 150 °C - Absolute maximum junction temperature, constraining heatsinking and duty-cycle design margins |
Pinout & Package
Package: TO-92 - Three-lead through-hole plastic package with standard lead spacing (1.27 mm pitch), 14.47 mm body length, and 3.60 mm width; suitable for manual assembly and low-power board-level integration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Current sink terminal | Reference node for base-emitter bias; connects to ground or low-side return path in common-emitter switches |
| 2 (Collector) | High-voltage output terminal | Carries switched load current; must be routed with clearance for ≥400 V transient isolation |
| 3 (Base) | Control input terminal | Receives current-limited drive signal; requires external resistor to limit IB to ≤0.75 A DC or 1.5 A pulse |
Key Features
| Feature | Design Value |
|---|---|
| High-voltage blocking | Rated for 400 V VCEO, enabling direct use in 220 VAC line-switched ballast topologies without snubbers |
| Fast switching performance | 1.1 µs turn-on and 0.7 µs fall time reduce switching losses in 20–50 kHz electronic ballast operation |
| Thermal robustness | 150 °C maximum junction temperature supports operation in enclosed lamp housings with limited airflow |
| TO-92 compatibility | Standard footprint allows drop-in replacement of legacy general-purpose transistors in existing ballast PCB layouts |
Applications
| Compact Fluorescent Lamp (CFL) Ballast | DC-DC Flyback Converter |
|---|---|
Use Scenario: Driving resonant LC tank in 18–21 W CFL fixtures powered from 220–240 VAC mains. IC Role / Device Role / Timing Role: High-voltage NPN switch controlling primary current in self-oscillating or driven half-bridge ballast topology. Use Value: 400 V VCEO and 1.5 A IC support direct mains-referenced operation without auxiliary winding regulation. | Use Scenario: Primary-side switching element in isolated 12 V to 5 V/3.3 V flyback converters for industrial sensors. IC Role / Device Role / Timing Role: Power switch modulating transformer energy transfer at 30–45 kHz switching frequency. Use Value: 4 MHz fT and sub-microsecond switching ensure stable loop response and minimal dead-time loss. |
| LED Driver (Resonant Topology) | Ignition Circuit for HID Lamps |
Use Scenario: Resonant half-bridge switch in constant-current LED drivers for street lighting modules. IC Role / Device Role / Timing Role: Low-conduction-loss NPN transistor operating in zero-voltage switching (ZVS) region. Use Value: 3.0 V VCE(sat) at 1.5 A minimizes I²R heating during high-duty-cycle operation. | Use Scenario: Trigger switch in high-voltage pulse generator for metal halide lamp ignition. IC Role / Device Role / Timing Role: Fast-pulse transistor delivering 1–2 kV ignition spikes via step-up transformer. Use Value: 700 V VCBO withstands reflected transformer spikes without clamping diodes. |
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 |
|---|---|---|---|
| MJD13003 | TO-220 package, higher PC (25 W), same VCEO/IC ratings but improved SOA at high VCE | Suitable for higher-power ballasts (>30 W) or forced-air-cooled converters | Select when thermal budget exceeds TO-92 limits or PCB layout allows larger footprint |
| BU508AF | Higher VCEO (1500 V), lower hFE (min 5), TO-220FP package, slower switching (tON ≈ 2.5 µs) | Used in TV horizontal deflection and high-reliability industrial HV supplies | Choose only if >600 V blocking or enhanced ruggedness against voltage transients is required |
Compared with FJN13003BU, MJD13003 offers superior thermal handling in larger packages while BU508AF trades speed for extreme voltage margin-neither is pin-compatible, but both serve adjacent high-voltage switching roles where package or SOA constraints differ.
Availability
FJN13003BU is available at Aetrix Electronics and suitable for electronic ballasts, flyback converters, and HID lamp ignition circuits requiring stable component supply and long-term manufacturability.
Supply support for FJN13003BU 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
Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and discrete components before its acquisition by ON Semiconductor in 2016.
The FJN13003BU belongs to Fairchild's high-voltage bipolar transistor family engineered specifically for energy-efficient lighting control and compact SMPS designs operating directly from AC mains.
FAQ
What is the maximum continuous collector current rating for the FJN13003BU?
The FJN13003BU has a maximum DC collector current (IC) rating of 1.5 A at Ta = 25°C. This value decreases with rising ambient temperature per the power derating curve, reaching zero at approximately 150°C ambient. For reliable operation, design must ensure junction temperature remains ≤150°C using appropriate heatsinking or duty-cycle limitation.
Does the FJN13003BU support pulse operation beyond its DC current rating?
Yes, the FJN13003BU supports pulsed collector current up to 3 A (ICP) under specified test conditions: pulse width = 5 ms and duty cycle < 10%. This capability enables short-duration surge handling in ignition circuits or peak-load ballast operation, provided average power dissipation stays within the 1.1 W limit at the given ambient temperature.
What is the typical saturation voltage of the FJN13003BU at 1.0 A collector current?
At IC = 1.0 A and IB = 0.25 A, the FJN13003BU exhibits a typical collector-emitter saturation voltage (VCE(sat)) of 1.0 V. This value is confirmed in the datasheet's Electrical Characteristics table and directly impacts conduction loss and thermal performance in switching applications such as electronic ballasts.
Is the FJN13003BU pin-compatible with other TO-92 NPN transistors like the 2N2222?
No, the FJN13003BU is not pin-compatible with general-purpose transistors such as the 2N2222. While both use TO-92 packaging, the FJN13003BU has emitter-collector-base (ECB) pinout (pin 1 = emitter, pin 2 = collector, pin 3 = base), whereas the 2N2222 uses emitter-base-collector (EBC) ordering. Incorrect substitution may cause circuit failure or damage.
Can the FJN13003BU be used in automotive lighting applications?
The FJN13003BU is not qualified for automotive applications per AEC-Q101 standards and lacks automotive-grade qualification documentation. Its 150°C junction rating supports under-hood temperatures, but absence of stress-test validation, PPAP support, or automotive-specific reliability data makes it unsuitable for safety-critical or production automotive lighting systems.
FJN13003BU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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):
- -
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 9 @ 500mA, 2V
- Power - Max:
- 1.1 W
- Frequency - Transition:
- 4MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
FJN13003BU FAQ
1.How can I place an order for FJN13003BU through Aetrix?
Please submit a Request for Quotation (RFQ) for FJN13003BU 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 FJN13003BU reliable?
The price and inventory of FJN13003BU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FJN13003BU is usually 5 days.
3.What payment methods are accepted for FJN13003BU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FJN13003BU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FJN13003BU?
FJN13003BU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FJN13003BU 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 FJN13003BU?
For technical support, including FJN13003BU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FJN13003BU requirements.
6.How does Aetrix verify that FJN13003BU is sourced from the original manufacturer or authorized distributors?
All FJN13003BU 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 FJN13003BU meets industry standards.
7.What is the process for return or replacement of FJN13003BU?
All FJN13003BU units undergo pre-shipment inspection (PSI). If there is an issue with FJN13003BU, 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 FJN13003BU part is unused and in its original packaging.
Return procedure for FJN13003BU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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