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onsemi BU807
- Part No.:
- BU807
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-220-3
- Datasheet:
-
BU807.pdf
- Description:
- TRANS NPN DARL 150V 8A TO-220-3
- Quantity:
- Payment:
- Shipping:
Inventory:6,651
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Product details
Overview
BU807 from STMicroelectronics is a medium-voltage NPN Darlington transistor in TO-220 package, configured with integrated antiparallel collector-emitter damper diode and base-emitter speed-up diode. It delivers VCEO = 150 V, IC = 8 A continuous, VCE(sat) = 1.5 V at IC = 5 A/IB = 50 mA, and fast switching (ton = 0.35 µs, toff = 0.4 µs), optimized for horizontal deflection stages in monochrome CRT video displays.
For engineers reviewing the BU807 datasheet, BU807 pinout, BU807 application, or BU807 equivalent, key selection criteria include sustaining voltage under zero-base-drive conditions (VCEO(sus) = 150 V), damper diode forward voltage (VF = 2 V at 4 A), thermal resistance (Rthj-case = 2.08 °C/W), and safe operating area for pulsed horizontal output loads.
Technical Context
The BU807 operates as a high-gain, low-base-drive Darlington pair with integrated speed-up diode across base-emitter to reduce storage time. Its internal damper diode enables self-contained flyback energy recirculation during CRT horizontal retrace, eliminating need for external snubber diodes.
Designed for linear-to-switching transition in CRT horizontal output stages, it supports resistive-load switching at VCC = 100 V with IB1 = 50 mA turn-on and IB2 = −500 mA active turn-off, achieving ts = 0.55 µs storage time and tf = 0.2 µs fall time under specified pulse conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 150 V - Maximum collector-emitter voltage with open base; defines safe blocking capability in horizontal output stage during retrace. |
| IC | 8 A - Continuous collector current rating; supports sustained horizontal scan current in 110° CRT deflection yokes. |
| VCE(sat) | 1.5 V @ IC = 5 A, IB = 50 mA - Low saturation voltage minimizes conduction loss and junction heating during active scan period. |
| ton / toff | 0.35 µs / 0.4 µs - Fast switching times enable precise timing control of horizontal flyback and scanning linearity. |
| VF (damper) | 2 V @ IF = 4 A - Forward voltage of integrated antiparallel diode; determines clamp efficiency and power dissipation during flyback. |
| Rthj-case | 2.08 °C/W - Junction-to-case thermal resistance; enables 60 W total dissipation with adequate heatsinking at Tcase < 25 °C. |
Pinout & Package
Supplied in TO-220 plastic package with standard 3-pin configuration: Pin 1 = Base, Pin 2 = Collector (tab-connected), Pin 3 = Emitter. The metal tab is electrically connected to the collector and must be insulated from chassis unless referenced to collector potential.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Base | Control input for Darlington pair; accepts low-current drive (IB ≤ 2 A) due to high hFE; includes integrated speed-up diode to ground. |
| Pin 2 | Collector (Tab) | Main power terminal and mechanical mounting surface; electrically tied to collector; requires insulating washer if mounted to grounded heatsink. |
| Pin 3 | Emitter | Power return path; connects internally to emitter of main transistor and cathode of integrated damper diode. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated damper diode | Eliminates external flyback diode; VF = 2 V at 4 A ensures efficient energy recirculation during CRT horizontal retrace. |
| Base-emitter speed-up diode | Reduces storage time to 0.55 µs by discharging base charge rapidly, enabling clean turn-off in high-frequency deflection. |
| High VCEO(sus) | 150 V sustaining voltage at IB = 0 guarantees reliable operation under transient overvoltage during flyback without gate/base bias. |
| Low Rthj-case | 2.08 °C/W allows 60 W dissipation with modest heatsinking-critical for compact CRT monitor designs with limited airflow. |
Applications
| Monochrome CRT Horizontal Deflection | Legacy Video Display Output Stage |
|---|---|
Use Scenario: Driving horizontal deflection yoke in 110° monochrome CRT monitors requiring precise linearity and stable retrace timing. IC Role / Device Role / Timing Role: Main switching transistor in quasi-resonant horizontal output stage; handles both scan current and flyback energy recovery. Use Value: Integrated damper diode and speed-up diode reduce component count by two devices while maintaining <0.55 µs storage time for stable 15.625 kHz operation. | Use Scenario: Replacement in aging industrial video terminals where BU806/BU807 were original-spec parts for analog video signal generation. IC Role / Device Role / Timing Role: High-current, medium-voltage switch managing horizontal sweep waveform integrity and yoke current slew rate. Use Value: VCEO = 150 V and ICM = 15 A peak support robust operation under load transients common in legacy display BOMs. |
| Compact CRT Monitor Power Stage | Analog Oscilloscope Horizontal Amplifier |
Use Scenario: Space-constrained monochrome monitor designs needing minimal external components and low thermal footprint. IC Role / Device Role / Timing Role: Primary power switch with built-in protection functions-no external snubber or clamping diode required. Use Value: Rthj-case = 2.08 °C/W enables full 60 W dissipation with small heatsink, reducing system volume vs. discrete diode solutions. | Use Scenario: High-fidelity horizontal timebase circuits in benchtop analog oscilloscopes requiring fast, repeatable sweep transitions. IC Role / Device Role / Timing Role: Switching element in Miller-integrated sweep generator; controls ramp linearity and blanking timing precision. Use Value: ton/toff = 0.35/0.4 µs and low VCE(sat) ensure minimal sweep distortion and consistent trace brightness across full bandwidth. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Darlington horizontal output applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BU806 | VCEO = 200 V, VCEV = 400 V, higher blocking but lower safe operating area at high current | Better suited for higher-voltage CRTs (>15 kV anode); less margin at 150 V sustained load | Select BU806 only when VCEO(sus) > 150 V is required; BU807 offers better thermal balance at typical 110° yoke currents. |
| 2SD1555 | No integrated damper diode; requires external BY228 or similar; VCEO = 160 V, IC = 7 A | Higher board area and layout complexity; needs separate diode routing and thermal management | Choose only if legacy design uses discrete diode topology or BU807 supply is constrained; adds 2–3 components and ~12 mm² PCB area. |
Compared with BU806 and 2SD1555, the BU807 uniquely combines 150 V VCEO, integrated damper diode, and 2.08 °C/W thermal resistance-making it the most space- and thermally efficient solution for standardized 110° monochrome CRT horizontal output stages.
Availability
BU807 is available at Aetrix Electronics and suitable for monochrome CRT deflection, legacy video display repair, and analog oscilloscope timebase circuits requiring stable component supply and long-lifecycle availability.
Supply support for BU807 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing analog, power, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.
The BU807 belongs to ST's legacy power bipolar transistor family, developed specifically for analog video deflection and high-reliability linear-switching hybrid applications in CRT-based equipment.
FAQ
Is BU807 pin-compatible with BU806?
Yes, BU807 and BU806 share identical TO-220 pinout (Base–Collector–Emitter), same mechanical dimensions, and compatible mounting. However, BU806 has higher VCEO (200 V) and VCEV (400 V) ratings, so substituting BU807 into BU806-designed circuits requires verification of blocking voltage margin under worst-case flyback conditions.
Can BU807 replace BU2520DX in horizontal output stages?
No-BU2520DX is a 1500 V, 10 A MOSFET-based horizontal output device with different drive requirements, gate control, and no integrated damper diode. BU807 is a bipolar Darlington with ±6 V VEBO and base-current drive; direct replacement would require redesign of bias network, snubber, and thermal layout.
What is the maximum safe operating frequency for BU807 in CRT applications?
BU807 is characterized for 15.625 kHz horizontal deflection (monochrome TV standard). Its 0.35 µs turn-on and 0.4 µs turn-off times support stable operation up to ~20 kHz with proper base drive and heatsinking; beyond that, storage time and thermal limits constrain reliability.
Does BU807 require external base resistor stabilization?
Yes-due to Darlington gain sensitivity and thermal runaway risk, ST recommends a base-stabilizing resistor (typically 10–47 Ω) between driver and Pin 1, plus optional emitter degeneration. The internal speed-up diode reduces but does not eliminate need for controlled base current limiting during switching transitions.
BU807 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Transistor Type:
- NPN - Darlington
- Current - Collector (Ic) (Max):
- 8 A
- Voltage - Collector Emitter Breakdown (Max):
- 150 V
- Vce Saturation (Max) @ Ib, Ic:
- 1.5V @ 50mA, 5A
- Current - Collector Cutoff (Max):
- 100µA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- -
- Power - Max:
- 60 W
- Frequency - Transition:
- -
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-3
BU807 FAQ
1.How can I place an order for BU807 through Aetrix?
Please submit a Request for Quotation (RFQ) for BU807 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 BU807 reliable?
The price and inventory of BU807 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BU807 is usually 5 days.
3.What payment methods are accepted for BU807?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BU807 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BU807?
BU807 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BU807 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 BU807?
For technical support, including BU807 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BU807 requirements.
6.How does Aetrix verify that BU807 is sourced from the original manufacturer or authorized distributors?
All BU807 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 BU807 meets industry standards.
7.What is the process for return or replacement of BU807?
All BU807 units undergo pre-shipment inspection (PSI). If there is an issue with BU807, 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 BU807 part is unused and in its original packaging.
Return procedure for BU807:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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