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onsemi BDX34BTU
- Part No.:
- BDX34BTU
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-220-3
- Datasheet:
-
BDX34BTU.pdf
- Description:
- TRANS PNP 80V 10A TO-220-3
- Quantity:
- Payment:
- Shipping:
Inventory:6,825
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Product details
Overview
BDX34BTU from ON Semiconductor is a PNP epitaxial silicon Darlington transistor in TO-220 package, rated for -80 V VCEO, -10 A continuous collector current, and 70 W power dissipation at TC = 25°C. It serves as a high-gain power switching or linear amplification device in motor drivers, power supplies, and industrial control circuits.
For engineers reviewing the BDX34BTU datasheet, pinout, applications, or equivalent options, key selection criteria include its -80 V blocking capability, Darlington configuration enabling high DC current gain (hFE ≥ 750), low saturation voltage (-2.5 V at -3 A), and thermal performance in TO-220 mounting.
Technical Context
The BDX34BTU implements a monolithic PNP Darlington pair with integrated base-emitter shunt resistor, delivering high current gain while maintaining robust safe operating area (SOA) up to 100 V and 10 A. Its structure supports both linear-mode operation (e.g., analog power regulation) and switched-mode use (e.g., relay/actuator drive).
It features three terminals-Base, Collector, Emitter-with fixed pinout (1=Base, 2=Collector, 3=Emitter) and requires external heatsinking due to 70 W power dissipation limit at 25°C case temperature. Thermal derating begins at TC > 25°C per the published power derating curve.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -80 V - Maximum continuous collector-emitter voltage before breakdown; defines maximum supply rail compatibility in PNP switch designs. |
| IC (DC) | -10 A - Continuous collector current rating; sets upper bound for steady-state load current handling. |
| PC | 70 W - Maximum power dissipation at TC = 25°C; determines minimum heatsink requirement for thermal management. |
| hFE | ≥750 - Minimum DC current gain at VCE = -3 V, IC = -3 A; enables low-base-drive-current switching of high-current loads. |
| VCE(sat) | -2.5 V - Collector-emitter saturation voltage at IC = -3 A, IB = -6 mA; directly impacts conduction loss and junction heating in on-state operation. |
| TJ | 150°C - Maximum allowable junction temperature; constrains thermal design margin under sustained load conditions. |
Pinout & Package
BDX34BTU is housed in a through-hole TO-220 package with standard 3-pin layout and metal tab connected to Collector for thermal and electrical integration. Pin assignment is fixed: Pin 1 = Base, Pin 2 = Collector (tab), Pin 3 = Emitter.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Base) | Control input terminal | Receives base current to turn on the Darlington pair; requires current-limiting resistor in series with driver. |
| 2 (Collector) | Main current sink node | Connected to load return path or negative supply; electrically and thermally tied to metal tab for heatsink mounting. |
| 3 (Emitter) | Output reference terminal | Typically tied to system ground or positive rail in high-side switch configurations; carries full load current. |
Key Features
| Feature | Design Value |
|---|---|
| Darlington architecture | Monolithic PNP pair delivering hFE ≥ 750, reducing required base drive current by ~10× vs. single transistor. |
| High VCEO rating | -80 V blocking capability enables use in 48 V industrial systems and legacy telecom power rails without cascading devices. |
| TO-220 mechanical interface | Standard footprint with insulated mounting hole and tab-to-pin isolation; compatible with widely available heatsinks and PCB footprints. |
| Complementary pairing | Direct complement to BDX33B (NPN counterpart), simplifying push-pull and H-bridge output stage design. |
Applications
| Industrial Motor Control | Linear Power Regulation |
|---|---|
Use Scenario: Driving 24–48 V DC brushed motors in PLC-controlled conveyor systems requiring bidirectional torque and stall protection. IC Role / Device Role / Timing Role: High-current PNP switch in emitter-follower or common-emitter configuration, delivering up to 10 A peak load current. Use Value: High hFE minimizes base drive burden on microcontroller GPIOs; -80 V rating accommodates back-EMF spikes during motor commutation. | Use Scenario: Adjustable linear regulator output stage in lab-grade bench power supplies with 0–30 V, 0–5 A output capability. IC Role / Device Role / Timing Role: Pass transistor controlling output voltage via feedback loop; operates in active region with forced-air cooling. Use Value: 70 W dissipation and SOA compliance support stable 5 A output at 5 V dropout without thermal runaway. |
| AC/DC Power Supply Protection | High-Side Load Switching |
Use Scenario: Overcurrent shutdown circuit in offline SMPS auxiliary supplies, monitoring primary-side current and latching off on fault. IC Role / Device Role / Timing Role: Latched PNP switch triggering crowbar or disable signal when sensed current exceeds threshold. Use Value: Low VCE(sat) (-2.5 V) ensures minimal voltage drop during fault detection, preserving timing accuracy of protection logic. | Use Scenario: 12 V automotive body control module powering solenoids, fans, and lighting loads with reverse-polarity and load-dump immunity. IC Role / Device Role / Timing Role: High-side switch with emitter tied to battery rail, collector driving load to ground. Use Value: TO-220 tab-to-collector connection allows direct heatsink mounting to chassis ground, improving EMC and thermal stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP Darlington transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BDX34C | VCEO = -100 V (vs. -80 V); otherwise identical pinout, gain, and package. | Supports higher-voltage rails (e.g., 72 V industrial buses); marginally higher leakage (ICEO = -0.5 mA at VCE = -50 V). | Select BDX34C only if system requires >80 V blocking; BDX34BTU offers optimal cost/performance for ≤48 V systems. |
| MJ15024G | Higher IC = -20 A, PC = 250 W, but in TO-3 package; no integrated Darlington (single PNP). | Requires external driver stage for same gain; suited for ultra-high-power audio amplifiers, not compact industrial controls. | Choose MJ15024G only when >10 A continuous current or >70 W dissipation is mandatory; BDX34BTU provides better integration for space-constrained designs. |
Compared with BDX34C and MJ15024G, the BDX34BTU balances voltage rating, gain, thermal footprint, and cost for mid-power industrial switching-offering drop-in compatibility with BDX33B in complementary pairs while avoiding over-specification or packaging complexity.
Availability
BDX34BTU is available at Aetrix Electronics and suitable for industrial motor control, linear power regulation, and high-side load switching requiring stable component supply and long-term manufacturing continuity.
Supply support for BDX34BTU 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 energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and IoT applications.
The BDX34BTU belongs to ON Semiconductor's legacy power bipolar transistor family, designed specifically for ruggedized linear and switching power applications where high gain, high voltage, and proven TO-220 reliability are essential.
FAQ
What is the pin configuration of the BDX34BTU?
The BDX34BTU uses a standard TO-220 package with fixed pinout: Pin 1 is Base, Pin 2 is Collector (connected to the metal tab), and Pin 3 is Emitter. This configuration is consistent across the BDX33/BDX34 family and verified in the official ON Semiconductor datasheet Rev. A. Mounting orientation must align with tab-down view for correct identification.
Does the BDX34BTU have an integrated base-emitter resistor?
No, the BDX34BTU does not include an integrated base-emitter resistor. It is a standard two-terminal Darlington pair (Base, Emitter, Collector) requiring external base current limiting. Unlike some modern digital transistors, it relies on discrete resistor networks for bias control and switching speed optimization.
What is the maximum pulsed collector current rating for the BDX34BTU?
The BDX34BTU has a specified pulsed collector current (ICP) of -15 A under pulse test conditions (PW = 300 µs, duty cycle = 1.5%). This rating applies only for short-duration, non-repetitive events such as inrush current limiting or fault transient handling-not for continuous or high-duty-cycle operation.
How does the BDX34BTU compare to the BDX34A and BDX34C variants?
The BDX34BTU corresponds to the BDX34B variant, with -80 V VCEO and -80 V VCBO ratings. It shares identical hFE, VCE(sat), and package with BDX34A and BDX34C, differing only in breakdown voltage. BDX34A is -60 V rated; BDX34C is -100 V rated-making BDX34BTU the optimal choice for 48 V nominal systems.
Can the BDX34BTU be used in parallel for higher current capacity?
Parallel operation of BDX34BTU devices is not recommended without individual emitter resistors and matched thermal mounting. The Darlington structure exhibits negative temperature coefficient in VBE, increasing current imbalance under thermal stress. For >10 A requirements, use a single higher-rated device like MJ15024G or redesign with MOSFET-based topology.
BDX34BTU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- Product Status:
- Obsolete
- Transistor Type:
- PNP
- Current - Collector (Ic) (Max):
- 10 A
- Voltage - Collector Emitter Breakdown (Max):
- 80 V
- Vce Saturation (Max) @ Ib, Ic:
- 2.5V @ 6mA, 3A
- Current - Collector Cutoff (Max):
- 500µA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 750 @ 3A, 3V
- Power - Max:
- 70 W
- Frequency - Transition:
- -
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-3
BDX34BTU FAQ
1.How can I place an order for BDX34BTU through Aetrix?
Please submit a Request for Quotation (RFQ) for BDX34BTU 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 BDX34BTU reliable?
The price and inventory of BDX34BTU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BDX34BTU is usually 5 days.
3.What payment methods are accepted for BDX34BTU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BDX34BTU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BDX34BTU?
BDX34BTU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BDX34BTU 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 BDX34BTU?
For technical support, including BDX34BTU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BDX34BTU requirements.
6.How does Aetrix verify that BDX34BTU is sourced from the original manufacturer or authorized distributors?
All BDX34BTU 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 BDX34BTU meets industry standards.
7.What is the process for return or replacement of BDX34BTU?
All BDX34BTU units undergo pre-shipment inspection (PSI). If there is an issue with BDX34BTU, 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 BDX34BTU part is unused and in its original packaging.
Return procedure for BDX34BTU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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