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BD708
STMicroelectronics
TRANS PNP 60V 12A TO220
6453 Pcs New Original In Stock
Bipolar (BJT) Transistor PNP 60 V 12 A 3MHz 75 W Through Hole TO-220
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5.0 / 5.0
- (175 Ratings)
BD708
Product Overview
12879099
DiGi Electronics Part Number
BD708-DGManufacturer
STMicroelectronics
BD708
Description
TRANS PNP 60V 12A TO220Inventory
6453 Pcs New Original In Stock
Bipolar (BJT) Transistor PNP 60 V 12 A 3MHz 75 W Through Hole TO-220
Quantity
Minimum 1
Minimum 1
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BD708 Technical Specifications
Category
Transistors, Bipolar (BJT), Single Bipolar Transistors
Packaging
-
Series
-
Product Status
Obsolete
Transistor Type
PNP
Current - Collector (Ic) (Max)
12 A
Voltage - Collector Emitter Breakdown (Max)
60 V
Vce Saturation (Max) @ Ib, Ic
1V @ 400mA, 4A
Current - Collector Cutoff (Max)
100µA (ICBO)
DC Current Gain (hFE) (Min) @ Ic, Vce
15 @ 4A, 4V
Power - Max
75 W
Frequency - Transition
3MHz
Operating Temperature
150°C (TJ)
Mounting Type
Through Hole
Package / Case
TO-220-3
Supplier Device Package
TO-220
Base Product Number
BD708
Datasheet & Documents
Datasheets
Download BD708 Product Specification (PDF)
HTML Datasheet
BD708-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8541.29.0095
Additional Information
Standard Package
1,000
Alternative Parts
View DetailsPART NUMBER
MANUFACTURER
QUANTITY AVAILABLE
DiGi PART NUMBER
UNIT PRICE
SUBSTITUTE TYPE
Reviews
5.0/5.0-(Show up to 5 Ratings)
December 02, 2025
제품의 견고함이 인상적이었고, 포장도 튼튼하게 잘 되어 있어서 배송 걱정 없이 믿고 구매할 수 있었습니다.
December 02, 2025
商品を包む梱包材の品質が高く、環境にも配慮されている点が気に入りました。
December 02, 2025
Die schnelle Abwicklung und der tolle Support machen den Einkauf bei DiGi Electronics zu einem Vergnügen.
December 02, 2025
Super quick shipping! I was amazed at how swiftly my order was sent out.
December 02, 2025
Their customer support team is efficient, friendly, and always approachable.
December 02, 2025
Quick resolution of issues and smooth logistics tracking.
December 02, 2025
My orders are shipped promptly, and their after-sales team provides timely assistance.
December 02, 2025
The support team’s friendliness makes resolving issues quick and easy.
December 02, 2025
I've had nothing but positive experiences with DiGi Electronics' products and staff.
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Frequently Asked Questions (FAQ)
Is the BD708 still a viable choice for new power amplifier designs given that it's marked as obsolete by STMicroelectronics, and what are the key risks of using it in production today?
Although the BD708 is listed as obsolete, it remains electrically functional and RoHS3 compliant, but using it in new designs introduces significant supply chain and long-term reliability risks. Since STMicroelectronics no longer manufactures the BD708, availability depends on remaining distributor stock, which can lead to counterfeit parts or sudden shortages. For new designs, we recommend transitioning to a modern, actively supported alternative like the TIP42AG or D45H8G, which offer similar PNP 60V/12A performance with guaranteed production support and better thermal characteristics. If you must use the BD708 for legacy compatibility, secure a lifetime buy and implement strict incoming inspection to mitigate counterfeit risks.
Can I safely replace the BD708 with a TIP42A-BP in a high-current motor driver circuit without redesigning the bias network or heatsink?
The TIP42A-BP is a direct functional replacement for the BD708 in most applications, sharing nearly identical electrical specs (60V, 12A, TO-220 package) and similar hFE and Vce(sat) characteristics. However, subtle differences in transition frequency (TIP42A-BP is typically 3MHz vs. BD708’s 3MHz nominal) and thermal resistance may affect high-frequency switching performance. In a motor driver with linear or low-frequency switching, the substitution is generally safe without bias or heatsink changes—provided the PCB footprint matches. Always verify base drive current requirements and perform thermal validation under worst-case load, as marginal differences in gain can shift power dissipation.
What thermal management considerations are critical when using the BD708 in a 75W power stage, and how does its junction-to-case thermal resistance impact heatsink selection?
The BD708 has a maximum power dissipation of 75W, but this is only achievable with an ideal heatsink and forced airflow. Its typical junction-to-case thermal resistance (RθJC) is around 1.67°C/W, meaning at full load, even a small temperature rise at the junction can exceed the 150°C Tj(max) limit without proper cooling. For reliable operation, use a heatsink with RθSA < 1.5°C/W and apply thermal paste to minimize interface resistance. In natural convection environments, derate power handling significantly—expect usable dissipation below 30W. Always monitor case temperature and consider adding a thermal shutdown circuit to prevent thermal runaway, especially in enclosed or high-ambient-temperature applications.
How does the BD708 compare to the 2N6490G in terms of saturation voltage and current gain stability under high-temperature operation, and which is better for linear regulator applications?
The BD708 typically exhibits a Vce(sat) of 1V at 4A, while the 2N6490G shows slightly higher saturation (up to 1.2V under same conditions), making the BD708 marginally more efficient in low-dropout scenarios. However, the 2N6490G offers better hFE stability over temperature and higher current gain at elevated junction temperatures, which improves regulation accuracy in linear regulators. For linear applications where thermal drift affects output voltage, the 2N6490G is often preferred despite its higher saturation loss. If your design prioritizes efficiency over precision (e.g., non-critical power stages), the BD708 may suffice—but for tight-tolerance regulators, the 2N6490G provides more predictable performance across temperature.
What are the risks of using the BD708 in a switching application near its 3MHz transition frequency, and how can I avoid parasitic oscillation or premature failure?
Operating the BD708 near its 3MHz fT limit pushes it into a region of reduced gain and increased susceptibility to parasitic oscillation due to package inductance and PCB layout parasitics. The device is not optimized for high-speed switching, and without careful design, you may encounter ringing, EMI issues, or localized heating that accelerates failure. To mitigate this, keep trace lengths short—especially base and emitter paths—use a ground plane, and add a small base stopper resistor (10–47Ω) to dampen high-frequency feedback. Avoid driving the BD708 into deep saturation; use Baker clamping or active pull-down if switching speed is critical. For frequencies above 500kHz, consider replacing it with a true switching transistor like the MJE13005 or a MOSFET-based solution to ensure reliability.
Quality Assurance (QC)
DiGi ensures the quality and authenticity of every electronic component through professional inspections and batch sampling, guaranteeing reliable sourcing, stable performance, and compliance with technical specifications, helping customers reduce supply chain risks and confidently use components in production.
BD708 CAD Models
STMicroelectronics BD708 PCB symbols & footprints
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