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STMicroelectronics BD711
- Part No.:
- BD711
- Manufacturer:
- STMicroelectronics
- Category:
- Single Bipolar Transistors
- Package:
- TO-220-3
- Datasheet:
-
BD711.pdf
- Description:
- TRANS NPN 100V 12A TO-220
- Quantity:
- Payment:
- Shipping:
Inventory:8,924
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Product details
Overview
BD711 from STMicroelectronics is a silicon epitaxial-base NPN power transistor in TO-220 plastic package, rated for 100 V VCBO, 12 A IC continuous, and 75 W total dissipation at Tc ≤ 25 °C. It serves as a high-voltage, medium-current switching and linear amplifier device in industrial power supplies and motor control stages.
For engineers reviewing the BD711 datasheet, BD711 pinout, BD711 application, or BD711 equivalent, key selection criteria include its 100 V collector-base breakdown rating, 12 A DC collector current capability, low 1 V VCE(sat) at 4 A/0.4 A drive, and thermal resistance of 1.67 °C/W junction-to-case - critical for heatsink-limited industrial designs.
Technical Context
The BD711 operates as a single NPN bipolar junction transistor optimized for linear and hard-switching applications up to 100 V. Its design supports stable DC current gain (hFE ≥ 30 at IC = 4 A, VCE = 4 V) and robust safe operating area (SOA) under pulsed and DC conditions.
It features a rugged epitaxial-base structure enabling high secondary breakdown energy, with specified VCEO(sus) = 100 V at IC = 100 mA and knee voltage VCEK = 0.4 V under defined bias. Thermal performance is characterized by Rthj-case = 1.67 °C/W and maximum junction temperature of 150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCBO | 100 V - maximum reverse-biased collector-base voltage before breakdown; defines safe operation in inductive switching |
| IC (continuous) | 12 A - maximum DC collector current at case temperature ≤ 25 °C; sets power stage current capacity |
| Ptot | 75 W - total power dissipation limit at Tc = 25 °C; determines heatsink sizing requirement |
| VCE(sat) | 1 V at IC = 4 A, IB = 0.4 A - low saturation voltage reduces conduction loss in switching mode |
| hFE | ≥ 30 at IC = 4 A, VCE = 4 V - sufficient DC gain for direct base drive without Darlington staging |
| Rthj-case | 1.67 °C/W - thermal resistance from junction to case; enables accurate junction temperature estimation |
| fT | 3 MHz - transition frequency at IC = 300 mA, VCE = 3 V; supports moderate-speed switching (~100–200 kHz) |
Pinout & Package
Package: TO-220 plastic, 3-pin, vertical mounting with metal tab electrically connected to collector. Case temperature sensing point located at mounting surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Emitting terminal for majority carriers | Low-impedance output node; referenced to ground or negative rail in common-emitter configuration |
| 2 (Base) | Control electrode for carrier injection | Requires ~0.4 A drive current to saturate 4 A collector current; sensitive to ESD |
| 3 (Collector / Tab) | Current collection node and thermal path | Electrically tied to metal tab; must be insulated from chassis unless circuit reference permits |
Key Features
| Feature | Design Value |
|---|---|
| High VCBO rating | 100 V enables use in 48 V and 72 V industrial bus systems with margin against transients |
| Low VCE(sat) | 1 V at 4 A reduces conduction loss to 4 W, improving efficiency in linear regulators and Class AB amplifiers |
| Rugged SOA | Specified sustaining voltage VCEO(sus) = 100 V at IC = 100 mA supports reliable operation under inductive load switching |
| Thermal performance | Rthj-case = 1.67 °C/W allows 75 W dissipation with ≤125 °C junction rise above 25 °C case temperature |
| Epitaxial-base construction | Enhances secondary breakdown immunity and pulse current handling (ICM = 18 A) |
Applications
| Industrial Power Supply | Motor Drive Stage |
|---|---|
Use Scenario: Regulating 48 V input to 24 V/5 A output in programmable DC power supply. IC Role / Device Role / Timing Role: NPN pass transistor in series-regulator topology, dissipating up to 60 W continuously. Use Value: 100 V VCBO provides 2× margin over 48 V rail; 75 W Ptot and 1.67 °C/W Rthj-case enable stable thermal operation with standard extruded heatsink. | Use Scenario: Driving 12 V, 8 A brushed DC motor in automated conveyor system. IC Role / Device Role / Timing Role: High-side switch in H-bridge half-bridge leg, operated in PWM mode at 20 kHz. Use Value: 12 A IC rating and 1 V VCE(sat) minimize I²R loss; fT = 3 MHz ensures adequate switching speed with gate drive optimization. |
| Linear Audio Amplifier | Welding Control Circuit |
Use Scenario: Output stage in 50 W Class AB audio amplifier for industrial PA systems. IC Role / Device Role / Timing Role: Complementary NPN output device paired with BD712 PNP in push-pull configuration. Use Value: hFE ≥ 30 at 4 A supports stable biasing; low VCEK = 0.4 V improves linearity near cutoff region. | Use Scenario: Current-switching element in IGBT gate driver auxiliary supply with 100 V transient exposure. IC Role / Device Role / Timing Role: Clamping and regulation transistor protecting driver IC during load dump events. Use Value: VCEO(sus) = 100 V withstands ISO 7637-2 Pulse 5a transients; 18 A ICM handles short-duration surge currents. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MJD127 | Lower VCBO (80 V), higher hFE (60 min), same TO-220 package | Not suitable for 100 V bus systems; better for 24–48 V linear regulators requiring less base drive | Select when lower drive current and tighter hFE tolerance are prioritized over voltage margin |
| TIP31C | Lower VCBO (100 V same), lower IC (3 A), lower Ptot (40 W), TO-220 package | Only viable for <2 A loads; insufficient for BD711's 12 A/75 W use cases | Use only in low-power replacements where thermal and current demands are significantly reduced |
Compared with MJD127 and TIP31C, the BD711 delivers unique combination of 100 V rating, 12 A current, and 75 W dissipation - making it irreplaceable in high-energy industrial switching and linear regulation where both voltage headroom and thermal capacity are simultaneously constrained.
Availability
BD711 is available at Aetrix Electronics and suitable for industrial power supplies, motor drive stages, linear audio amplifiers, and welding control circuits requiring stable component supply across extended production lifecycles.
Supply support for BD711 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, MCU, and sensor solutions for industrial, automotive, and consumer markets.
The BD7xx series belongs to ST's legacy high-voltage bipolar power transistor family, engineered specifically for robust linear and switching power conversion in harsh industrial environments.
FAQ
Is BD711 still in active production?
No - BD711 is marked obsolete per STMicroelectronics' official documentation (1999 datasheet revision). However, Aetrix Electronics maintains legacy inventory with full traceability and offers engineering support for obsolescence mitigation, including cross-reference analysis and drop-in alternatives where technically validated.
What is the electrical connection of the metal tab on BD711?
The metal tab on the BD711 TO-220 package is internally connected to the collector terminal. This requires electrical isolation from the heatsink unless the collector node is at chassis ground potential. Use of insulating shoulder washers and mica pads is mandatory in most configurations to prevent short circuits.
Can BD711 replace BD707 in an existing design?
Yes - BD711 is a direct voltage-upgraded version of BD707, sharing identical pinout, package, and thermal characteristics. Its 100 V VCBO replaces BD707's 60 V rating, allowing reuse in higher-voltage designs without layout change, provided base drive and SOA margins are re-verified for the increased voltage stress.
What is the maximum safe continuous collector current at 70 °C case temperature?
Derating from 75 W at 25 °C case using Rthj-case = 1.67 °C/W gives max junction temperature of 150 °C at 75 W. At Tc = 70 °C, allowable power is (150 − 70) / 1.67 ≈ 47.9 W. With VCE(sat) ≈ 1 V, max continuous IC ≈ 47.9 A - but absolute max IC remains 12 A per Absolute Maximum Ratings; thus, 12 A is the limiting factor, not thermal, at this temperature.
BD711 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- Product Status:
- Obsolete
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 12 A
- Voltage - Collector Emitter Breakdown (Max):
- 100 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)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220
BD711 FAQ
1.How can I place an order for BD711 through Aetrix?
Please submit a Request for Quotation (RFQ) for BD711 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 BD711 reliable?
The price and inventory of BD711 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BD711 is usually 5 days.
3.What payment methods are accepted for BD711?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BD711 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BD711?
BD711 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BD711 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 BD711?
For technical support, including BD711 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BD711 requirements.
6.How does Aetrix verify that BD711 is sourced from the original manufacturer or authorized distributors?
All BD711 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 BD711 meets industry standards.
7.What is the process for return or replacement of BD711?
All BD711 units undergo pre-shipment inspection (PSI). If there is an issue with BD711, 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 BD711 part is unused and in its original packaging.
Return procedure for BD711:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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