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onsemi BU407HTU
- Part No.:
- BU407HTU
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-220-3
- Datasheet:
-
BU407HTU.pdf
- Description:
- TRANS NPN 150V 7A TO-220-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,793
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Product details
Overview
BU407HTU from ON Semiconductor is a high-voltage NPN epitaxial silicon power transistor designed for horizontal deflection output stages in CRT displays. It features 330 V collector-base voltage, 150 V collector-emitter voltage, 7 A DC collector current, 60 W collector dissipation at TC=25°C, and 10 MHz current gain bandwidth product.
For engineers reviewing the BU407HTU datasheet, pinout, applications, or equivalent options, key selection criteria include safe operating area (SOA) compliance at high-voltage switching, turn-off time of 0.4 µs under IC=5A/IB=0.8A conditions, and TO-220 package thermal performance for flyback and line-output circuits.
Technical Context
The BU407HTU operates as a high-voltage switching transistor with optimized SOA for repetitive pulse operation in horizontal deflection circuits. Its 150 V VCEO rating and 330 V VCBO support robust blocking during flyback recovery, while its 0.4 µs tOFF enables precise timing control in 15.625 kHz line-scan applications.
Designed for linear and switching modes in analog video systems, it delivers low VCE(sat) of 1.0 V at IC=5A/IB=0.8A and VBE(sat) of 1.2 V under same conditions. The device's junction temperature limit of 150°C and TO-220 thermal resistance support stable operation under sustained load in compact CRT driver layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCBO | 330 V - Enables reliable blocking during CRT flyback voltage spikes without breakdown |
| VCEO | 150 V - Supports standard horizontal deflection supply rails in legacy TV and monitor designs |
| IC (DC) | 7 A - Sustains continuous current in high-power line-output stage operation |
| PC (TC=25°C) | 60 W - Provides thermal headroom for TO-220 mounting with heatsink in convection-cooled chassis |
| tOFF | 0.4 µs - Ensures fast turn-off for precise horizontal scan timing at 15.625 kHz |
| fT | 10 MHz - Maintains sufficient gain margin for stable base drive loop response |
| TJ max | 150°C - Allows operation in sealed CRT enclosures with elevated ambient temperatures |
Pinout & Package
BU407HTU is housed in a through-hole TO-220 package with standard 3-pin configuration: Pin 1 = Base, Pin 2 = Collector (tab), Pin 3 = Emitter. The metal tab is electrically connected to the collector and must be insulated from chassis ground when mounted.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Base) | Control input | Receives base drive current up to 4 A to saturate the transistor; requires current-limiting resistor in series with driver IC |
| 2 (Collector) | High-voltage output node | Connected to flyback transformer primary; tab is electrically active and thermally coupled to heatsink |
| 3 (Emitter) | Current return path | Ground-referenced emitter connection; carries full load current and requires low-inductance PCB trace routing |
Key Features
| Feature | Design Value |
|---|---|
| High VCBO rating | 330 V - Prevents avalanche failure during CRT flyback voltage overshoot |
| Fast turn-off time | 0.4 µs - Reduces switching loss and improves horizontal linearity in deflection circuits |
| Robust SOA | Rated for pulsed IC up to 10 A - Accommodates peak currents during retrace intervals |
| TO-220 thermal interface | Low RθJC - Enables effective heat transfer to external heatsink without thermal derating at 7 A DC |
| High hFE at 5 A | Typical DC current gain >20 - Reduces required base drive power and driver transistor stress |
Applications
| TV Horizontal Deflection | Monitor Line Output Stage |
|---|---|
Use Scenario: Horizontal scanning circuit in analog CRT televisions requiring precise 15.625 kHz line frequency and high-voltage flyback generation. IC Role / Device Role / Timing Role: Main switching transistor in line output stage, directly driving flyback transformer primary winding. Use Value: 0.4 µs tOFF ensures minimal retrace distortion; 330 V VCBO withstands flyback spikes up to 300 V without clamping. | Use Scenario: High-resolution computer monitor with extended line frequency range and tighter geometry stability requirements. IC Role / Device Role / Timing Role: Power switch in regulated horizontal deflection system with dynamic focus compensation. Use Value: 60 W PC rating supports continuous 7 A operation under high-brightness display loads; TO-220 package allows direct heatsink mounting in space-constrained chassis. |
| Video Projector Flyback | Legacy Broadcast Equipment |
Use Scenario: CRT-based video projector requiring stable high-voltage EHT generation and low geometric distortion. IC Role / Device Role / Timing Role: Primary-side switch in resonant flyback converter feeding EHT multiplier stack. Use Value: 10 MHz fT maintains gain stability across temperature for closed-loop horizontal sync; 150°C TJ max accommodates sealed optical engine environments. | Use Scenario: Analog broadcast test equipment and studio monitors needing long-term reliability and consistent deflection timing. IC Role / Device Role / Timing Role: Line output switch in calibrated reference display units used for waveform monitoring. Use Value: Tight VCE(sat) tolerance (1.0 V max) ensures repeatable brightness and geometry calibration across production units. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage switching transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BU2520DX | Higher VCEO (200 V), lower tOFF (0.25 µs), TO-220F package with insulated tab | Better suited for higher-frequency deflection (e.g., 31.25 kHz) and non-insulated heatsink mounting | Select BU2520DX when faster switching or electrical isolation from heatsink is required |
| 2SC5148 | Lower VCBO (250 V), same VCEO (150 V), TO-3P package with higher thermal mass | Preferred in high-reliability broadcast gear where mechanical ruggedness and long-term SOA stability are critical | Choose 2SC5148 for mission-critical analog video infrastructure with extended service life expectations |
Compared with BU2520DX and 2SC5148, the BU407HTU offers balanced voltage rating, proven SOA behavior in 15.625 kHz CRT applications, and cost-effective TO-220 implementation-making it optimal for mainstream analog display repair and legacy system maintenance where VCBO margin and thermal simplicity are prioritized.
Availability
BU407HTU is available at Aetrix Electronics and suitable for CRT television repair, analog monitor refurbishment, and legacy broadcast equipment maintenance requiring stable component supply and long-lifecycle support.
Supply support for BU407HTU 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 power management, analog, sensors, and discrete devices for automotive, industrial, and consumer applications.
The BU407HTU belongs to ON Semiconductor's high-voltage bipolar transistor product line, engineered specifically for horizontal deflection and flyback power conversion in analog CRT-based systems.
FAQ
What is the maximum collector-emitter voltage rating for BU407HTU?
The BU407HTU has a maximum collector-emitter voltage (VCEO) rating of 150 V at TC = 25°C. This rating is validated for continuous DC operation and defines the upper limit for safe blocking in horizontal deflection circuits. Exceeding this voltage risks avalanche breakdown, especially under transient conditions without proper snubbing. Always verify operating VCE against the BU407HTU SOA curve in the official datasheet for pulsed conditions.
Does BU407HTU have a built-in base-emitter resistor?
No, the BU407HTU is a standard NPN bipolar junction transistor without any integrated base-emitter resistors. It requires external base drive circuitry-including current-limiting resistors and, optionally, a base-emitter shunt resistor for improved turn-off speed. This discrete design gives full control over base current profile and switching characteristics in CRT line-output applications.
What is the thermal resistance from junction to case (RθJC) for BU407HTU?
The BU407HTU has a typical junction-to-case thermal resistance (RθJC) of 1.0°C/W when mounted with proper torque and thermal interface material on a heatsink. This value is derived from its TO-220 package construction and enables effective heat dissipation at 60 W collector dissipation. Actual RθJC depends on mounting pressure, heatsink flatness, and thermal paste quality-designers should validate thermal performance under worst-case ambient conditions.
Can BU407HTU replace BU407 in existing designs?
Yes, BU407HTU is a direct replacement for BU407 in most applications. Both share identical electrical specifications, pinout (Base–Collector–Emitter), and TO-220 package. The "H" suffix denotes enhanced switching performance-specifically reduced tOFF (0.4 µs vs. 0.75 µs for BU407)-with no trade-offs in voltage or current ratings. No PCB or schematic changes are needed when upgrading from BU407 to BU407HTU.
Is BU407HTU suitable for use in modern LCD or LED TV power supplies?
No, BU407HTU is not recommended for modern switch-mode power supplies in LCD or LED TVs. It is optimized for 15.625 kHz horizontal deflection in CRT systems-not for high-frequency (50–500 kHz) SMPS topologies. Its 10 MHz fT and SOA are mismatched to modern controller ICs and MOSFET-driven architectures. Use ON Semiconductor's NCP1xx or NCP12xx series instead for contemporary power supply designs.
BU407HTU 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):
- 7 A
- Voltage - Collector Emitter Breakdown (Max):
- 150 V
- Vce Saturation (Max) @ Ib, Ic:
- 1V @ 800mA, 5A
- Current - Collector Cutoff (Max):
- 5mA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- -
- Power - Max:
- 60 W
- Frequency - Transition:
- 10MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-3
BU407HTU FAQ
1.How can I place an order for BU407HTU through Aetrix?
Please submit a Request for Quotation (RFQ) for BU407HTU 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 BU407HTU reliable?
The price and inventory of BU407HTU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BU407HTU is usually 5 days.
3.What payment methods are accepted for BU407HTU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BU407HTU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BU407HTU?
BU407HTU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BU407HTU 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 BU407HTU?
For technical support, including BU407HTU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BU407HTU requirements.
6.How does Aetrix verify that BU407HTU is sourced from the original manufacturer or authorized distributors?
All BU407HTU 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 BU407HTU meets industry standards.
7.What is the process for return or replacement of BU407HTU?
All BU407HTU units undergo pre-shipment inspection (PSI). If there is an issue with BU407HTU, 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 BU407HTU part is unused and in its original packaging.
Return procedure for BU407HTU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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