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onsemi BDX54BTU
- Part No.:
- BDX54BTU
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-220-3
- Datasheet:
-
BDX54BTU.pdf
- Description:
- TRANS PNP DARL 80V 8A TO-220-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,121
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Product details
Overview
BDX54BTU from ON Semiconductor (formerly Fairchild) is a PNP epitaxial silicon Darlington transistor in TO-220 package, rated for -8 A DC collector current, -60 V collector-emitter voltage, 60 W power dissipation at TC=25°C, and 150°C junction temperature-used in high-current linear and switching applications such as audio output stages and hammer drivers.
For engineers reviewing the BDX54BTU datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed hFE ≥750 at IC = -3 A, VCE(sat) ≤ -2 V, integrated damper diode with VF ≤ -2.5 V at IF = -8 A, and thermal derating compliance up to 150°C junction operation.
Technical Context
The BDX54BTU implements a monolithic PNP Darlington pair with integrated parallel emitter-base clamp diode, enabling high-current switching without external flyback protection in inductive loads. Its architecture delivers high DC current gain while maintaining low saturation voltage under heavy conduction.
It is designed for complementary use with BDX53BTU in push-pull configurations, supporting symmetrical drive in Class AB audio amplifiers and bidirectional motor control circuits where matched thermal and electrical characteristics are required across NPN/PNP pairs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCBO | -60 V - maximum reverse bias before breakdown between collector and base |
| VCEO | -60 V - maximum safe collector-emitter voltage with base open |
| IC (DC) | -8 A - continuous collector current capability at TC = 25°C |
| hFE | ≥750 - minimum DC current gain at VCE = -3 V, IC = -3 A ensures reliable base drive efficiency |
| VCE(sat) | ≤ -2 V - collector-emitter voltage drop at IC = -3 A, IB = -12 mA defines conduction loss in saturated switch mode |
| VF (diode) | ≤ -2.5 V - forward voltage of integrated damper diode at IF = -8 A enables fast inductive energy recirculation |
| PC | 60 W - maximum power dissipation at case temperature 25°C, requires heatsink for sustained operation |
Pinout & Package
BDX54BTU uses the standard TO-220 package with 3 leads: Base (Pin 1), Collector (Pin 2), Emitter (Pin 3). The metal tab is electrically connected to the collector and must be isolated from chassis ground unless intentionally used as heat path.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Base) | Control input | Receives base current to enable Darlington conduction; requires current-limiting resistor in series |
| 2 (Collector) | High-side power terminal | Connected to load supply rail; metal tab is collector, requiring electrical isolation when mounted to heatsink |
| 3 (Emitter) | Current return path | Common emitter node for load connection; referenced to system ground or negative rail in PNP configuration |
Key Features
| Feature | Design Value |
|---|---|
| Integrated damper diode | Eliminates need for external flyback diode in relay/hammer driver circuits, reducing BOM count and PCB area |
| High hFE (≥750) | Reduces required base drive current by >3× vs. single transistors, easing microcontroller GPIO or driver IC loading |
| TO-220 mechanical robustness | Supports >10⁵ thermal cycles and >5 kgf mounting torque, suitable for industrial power modules |
| Complementary pairing | Matched VCEO, IC, and thermal specs with BDX53BTU enable balanced push-pull amplifier designs |
Applications
| Audio Amplifier Output Stage | Electromechanical Hammer Driver |
|---|---|
Use Scenario: High-fidelity Class AB audio output stage delivering ±3 A peak into 4 Ω speaker loads. IC Role / Device Role / Timing Role: PNP Darlington output transistor providing current gain and low-saturation conduction in the negative half-cycle. Use Value: Integrated damper diode suppresses back-EMF during signal zero-crossings, preventing crossover distortion and protecting driver stage. | Use Scenario: Driving solenoid-based impact hammers in industrial marking or riveting equipment. IC Role / Device Role / Timing Role: High-current switch controlling 24 V/5 A inductive hammer coil with rapid on/off cycling. Use Value: 60 W power rating and 150°C TJ allow sustained 10 Hz pulse operation without thermal shutdown; built-in diode clamps inductive kick. |
| DC Motor Direction Control | Linear Power Regulator Pass Element |
Use Scenario: Bidirectional H-bridge motor driver using complementary BDX54BTU/BDX53BTU pairs per leg. IC Role / Device Role / Timing Role: PNP high-side switch enabling reverse polarity drive in brushed DC motors. Use Value: Matched VCEO (-60 V) and IC (-8 A) with BDX53BTU ensure symmetrical voltage/current handling and thermal tracking across direction states. | Use Scenario: Unregulated 48 V input to 24 V/3 A output linear regulator for test instrumentation. IC Role / Device Role / Timing Role: Series pass element dissipating up to 72 W transiently during load transients. Use Value: 60 W continuous PC at TC=25°C plus derating curve supports short-term overload without latch-up; TO-220 facilitates bolt-down heatsinking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP Darlington transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MJD54T4G | TO-263 package, lower PC = 35 W, same VCEO = -60 V, hFE min = 750 | Suitable for surface-mount designs with reduced thermal mass; not interchangeable without layout change | Select when board space is constrained and thermal management uses PCB copper rather than external heatsink |
| TIP54 | TO-220 package, same pinout, but VCEO = -45 V, IC = -6 A, no integrated diode | Requires external flyback diode; limited to lower-voltage, lower-current switching | Choose only if operating below 40 V and <5 A, and cost sensitivity outweighs design simplicity |
Compared with MJD54T4G and TIP54, the BDX54BTU offers higher power dissipation (60 W vs. 35 W or 40 W), integrated damper diode, and proven thermal stability in through-hole industrial assemblies-making it preferred for legacy-replacement and high-reliability linear switching roles.
Availability
BDX54BTU is available at Aetrix Electronics and suitable for audio amplifier output stages, electromechanical hammer drivers, DC motor direction control, and linear power regulator pass elements requiring stable component supply across long-lifecycle industrial programs.
Supply support for BDX54BTU 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 supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The BDX54BTU belongs to Fairchild's legacy high-power Darlington transistor family, engineered for ruggedized linear and switching power control in industrial automation and audio systems where reliability under thermal stress is critical.
FAQ
What is the maximum continuous collector current rating for BDX54BTU?
The BDX54BTU has a maximum continuous collector current (IC) rating of -8 A at case temperature TC = 25°C. This rating decreases with rising case temperature per the published derating curve, reaching zero at TC ≈ 175°C. For sustained operation above 25°C, a heatsink must be used to maintain TC within limits. The BDX54BTU datasheet specifies this value under DC conditions with proper thermal management.
Does BDX54BTU include an integrated diode, and what is its function?
Yes, the BDX54BTU integrates a parallel damper diode across its emitter-base junction. This diode provides intrinsic flyback protection for inductive loads, clamping reverse voltage spikes generated during turn-off. It eliminates the need for an external diode in hammer drivers and relay controls, simplifying circuit design and improving reliability. The BDX54BTU diode forward voltage is ≤ -2.5 V at -8 A.
Is BDX54BTU pin-compatible with BDX53BTU?
No, BDX54BTU and BDX53BTU are complementary devices-not pin-compatible. BDX54BTU is PNP; BDX53BTU is NPN. Both use TO-220 packages with identical pinout (Base–Collector–Emitter), but their polarities and biasing requirements differ fundamentally. They are intended for paired use in push-pull topologies, not direct substitution. The BDX54BTU must be used with correct PNP biasing and load referencing.
What is the guaranteed DC current gain (hFE) of BDX54BTU at typical operating conditions?
The BDX54BTU guarantees a minimum DC current gain (hFE) of 750 when tested at VCE = -3 V and IC = -3 A. This specification ensures predictable base drive requirements in linear and saturated switching modes. Typical hFE exceeds 1000 under these conditions, but design margins should rely on the guaranteed minimum. The BDX54BTU hFE remains stable over temperature due to Darlington topology compensation.
Can BDX54BTU be used in surface-mount applications?
No, the BDX54BTU is a through-hole TO-220 device and is not suitable for surface-mount assembly. Its leadframe and thermal pad require hole-mounting and mechanical screw attachment to a heatsink. For SMT alternatives, consider MJD54T4G (TO-263) or FZT653 (SOT-223), though neither matches the BDX54BTU's 60 W power rating or integrated diode. The BDX54BTU is optimized for legacy through-hole industrial power designs.
BDX54BTU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- Product Status:
- Obsolete
- Transistor Type:
- PNP - Darlington
- Current - Collector (Ic) (Max):
- 8 A
- Voltage - Collector Emitter Breakdown (Max):
- 80 V
- Vce Saturation (Max) @ Ib, Ic:
- 2V @ 12mA, 3A
- Current - Collector Cutoff (Max):
- 500µA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 750 @ 3A, 3V
- Power - Max:
- 60 W
- Frequency - Transition:
- -
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-3
BDX54BTU FAQ
1.How can I place an order for BDX54BTU through Aetrix?
Please submit a Request for Quotation (RFQ) for BDX54BTU 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 BDX54BTU reliable?
The price and inventory of BDX54BTU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BDX54BTU is usually 5 days.
3.What payment methods are accepted for BDX54BTU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BDX54BTU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BDX54BTU?
BDX54BTU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BDX54BTU 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 BDX54BTU?
For technical support, including BDX54BTU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BDX54BTU requirements.
6.How does Aetrix verify that BDX54BTU is sourced from the original manufacturer or authorized distributors?
All BDX54BTU 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 BDX54BTU meets industry standards.
7.What is the process for return or replacement of BDX54BTU?
All BDX54BTU units undergo pre-shipment inspection (PSI). If there is an issue with BDX54BTU, 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 BDX54BTU part is unused and in its original packaging.
Return procedure for BDX54BTU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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