BDX54B STMicroelectronics Transistor Darlington Pair (Transistor Outline, Vertical) In Stock
BDX54B is a PNP Darlington transistor from STMicroelectronics rated at 80 V collector-emitter voltage and 8 A continuous collector current with a minimum hFE of 750, housed in a TO-220AB package. It includes an integrated freewheeling diode and base resistors for simplified inductive load switching.
- Manufacturer
- STMicroelectronics
- Package
- Transistor Outline, Vertical
- Pin Count
- 3
- Lifecycle
- OBSOLETE
- Datasheet
- BDX54B Datasheet PDF
- Category
- Transistor Darlington Pair
- Price
- From $0.1950(MOQ 1)
- Temp Range
- ?°C to 150.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of BDX54B?
- PNP Darlington pair delivering up to 8 A collector current with minimum DC current gain (hFE) of 750 for high-current switching from low base drive
- Integrated built-in freewheeling diode and base-emitter resistors reduce external component count in motor and relay driver circuits
- Rated 80 V collector-emitter voltage in a TO-220AB package, enabling efficient heat dissipation for continuous high-current operation
What is BDX54B used for?
The BDX54B excels in PNP high-side switching applications including DC motor speed control, solenoid drivers, and power supply pass elements operating at up to 80 V and 8 A. Its integrated diode and resistors make it a drop-in solution for inductive load protection in industrial automation equipment, automotive body electronics, and linear voltage regulator designs.
What are the specifications of BDX54B?
| Pbfree Code | Yes |
| YTEOL | 0 |
| Collector Current-Max (IC) | 8A |
| Collector-Emitter Voltage-Max | 80V |
| Configuration | DARLINGTON WITH BUILT-IN DIODE AND RESISTOR |
| DC Current Gain-Min (hFE) | 750 |
| JEDEC-95 Code | TO-220AB |
| JESD-30 Code | R-PSFM-T3 |
| JESD-609 Code | e3 |
| Number of Elements | 1 |
| Package Body Material | PLASTIC/EPOXY |
| Package Shape | RECTANGULAR |
| Package Style | FLANGE MOUNT |
| Polarity/Channel Type | PNP |
| Power Dissipation Ambient-Max | 60W |
| Power Dissipation-Max (Abs) | 60W |
| Qualification Status | Not Qualified |
| Surface Mount | NO |
| Terminal Finish | MATTE TIN |
| Terminal Form | THROUGH-HOLE |
| Terminal Position | SINGLE |
| Transistor Application | SWITCHING |
| Transistor Element Material | SILICON |
| Transition Frequency-Nom (fT) | 20MHz |
| VCEsat-Max | 2V |
| Package | Transistor Outline, Vertical |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8541.29.00.95 |
Where can I find the BDX54B datasheet?
BDX54B Datasheet DownloadOfficial datasheet from STMicroelectronics
What are equivalent replacements for BDX54B?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What are the key electrical ratings of the BDX54B Darlington transistor?
The BDX54B is rated for a maximum collector-emitter voltage of 80 V, a continuous collector current of 8 A, and a minimum DC current gain (hFE) of 750, making it capable of switching substantial PNP high-side loads from a low-level base drive signal.
How does the BDX54B's 8 A rating compare to lower-current Darlington devices like the BD679?
The BDX54B doubles the continuous collector current of the BD679 (4 A) by providing 8 A capacity at the same 80 V collector-emitter voltage and hFE of 750, making the BDX54B the preferred choice for more demanding motor drive or power supply applications while sharing the same integrated diode and resistor configuration.
Why does the BDX54B suit inductive load applications without an external flyback diode?
The BDX54B incorporates a built-in freewheeling diode across the collector-emitter junction, clamping inductive kickback spikes when switching relays, solenoids, or DC motors at up to 8 A and 80 V, eliminating the external Schottky or fast-recovery diode typically required for protection.
What thermal management approach is recommended for the BDX54B in continuous 8 A operation?
Mounted in a TO-220AB package, the BDX54B can be bolted directly to an external heat sink using an M3 screw; at 8 A continuous and 80 V, the junction must be kept below 150 °C, so a heat sink with a thermal resistance of 5 °C/W or lower is typically required depending on ambient conditions.
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Why Buy from FindMyChip
About STMicroelectronics
STMicroelectronics is a global semiconductor leader serving customers across the spectrum of electronics applications. ST's products are found in a wide range of applications including automotive, industrial, personal electronics, and communications.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $0.4029 | $0.40 |
| 13+ | $0.3358 | $4.37 |
| 121+ | $0.3000 | $36.30 |
| 250+ | $0.2400 | $60.00 |
| 500+ | $0.2100 | $105.00 |
| 1000+ | $0.1950 | $195.00 |
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