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Diodes Incorporated BCP54TA
- Part No.:
- BCP54TA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
BCP54TA.pdf
- Description:
- TRANS NPN 45V 1A SOT-223-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,681
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Product details
Overview
BCP54TA from Diodes Incorporated is an NPN silicon planar medium-power transistor in SOT-223 package, rated for 1 A continuous collector current, 45 V VCEO, and 0.5 V VCE(sat) at IC=500 mA/IB=50 mA; used in audio frequency driver and output stages of consumer amplifiers and power management circuits.
For engineers reviewing the BCP54TA datasheet, BCP54TA pinout, BCP54TA application, or BCP54TA equivalent, key selection criteria include hFE binning (BCP54-10: 40–100; BCP54-16: 100–250), thermal performance in SOT-223, low saturation voltage for efficient switching, and complementary pairing with BCP51TA in push-pull configurations.
Technical Context
This transistor operates as a medium-power linear or switching amplifier with fixed-gain hFE bins defined per part marking (BCP54-10/BCP54-16), supporting DC-coupled AF driver stages and emitter-follower output buffers. Its 2 W power dissipation at Tamb=25°C and -55°C to +150°C operating range enable use in thermally constrained industrial and automotive cabin modules.
The device features pulsed fT = 100 MHz at IC=50 mA/VCE=10 V, confirming suitability for high-fidelity AF bandwidth extension up to ~20 kHz with minimal phase shift; VBE(on) = 1.0 V at IC=500 mA ensures predictable base drive requirements in discrete bias networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 45 V - supports rail voltages up to ±22 V in Class AB audio outputs without breakdown |
| IC (continuous) | 1 A - enables direct drive of 8 Ω loads delivering ≥2 W RMS into speaker loads |
| VCE(sat) | 0.5 V @ IC=500 mA/IB=50 mA - limits conduction loss to ≤250 mW in saturated switch mode |
| hFE (BCP54-16) | 100–250 @ IC=150 mA/VCE=2 V - provides stable current gain for bias stability in emitter-degenerated stages |
| Ptot | 2 W @ Tamb=25°C - requires minimum 2.5 cm² copper pour on PCB for thermal compliance in sealed enclosures |
| fT | 100 MHz @ IC=50 mA/VCE=10 V - ensures <1° phase error across full audio band (20 Hz–20 kHz) |
Pinout & Package
SOT-223 package with exposed thermal pad (pin 4) tied to collector; standard 3-pin configuration (pins 1–3) plus thermal tab (pin 4). Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector, Pin 4 = Collector (thermal tab).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Emitter | Low-impedance return path for collector current; connects to ground or emitter resistor in common-emitter stage |
| Pin 2 | Base | Current-controlled input node; requires 50 mA drive for full saturation at 500 mA load |
| Pin 3 | Collector | Main power output terminal; electrically and thermally connected to pin 4 (exposed tab) |
| Pin 4 | Collector (thermal tab) | Primary heat transfer surface; must be soldered to ≥2.5 cm² internal/external copper for Ptot derating |
Key Features
| Feature | Design Value |
|---|---|
| Low VCE(sat) | 0.5 V enables >90% efficiency in Class B output stages driving 8 Ω speakers |
| hFE binning | Two gain groups (40–100 and 100–250) allow precise bias point control in production matching |
| Complementary pair | BCP51TA (PNP) shares identical SOT-223 footprint and ratings for push-pull amplifier symmetry |
| High fT | 100 MHz ensures flat gain response and minimal distortion up to 20 kHz in AF applications |
Applications
| Audio Power Amplifier Output Stage | DC Motor Driver (Small Fan) |
|---|---|
Use Scenario: Final output stage in 2 W mono audio amplifier feeding 8 Ω loudspeaker. IC Role / Device Role / Timing Role: NPN emitter-follower delivering peak current up to 1 A with minimal crossover distortion. Use Value: 0.5 V VCE(sat) reduces thermal load by 35% vs. legacy TO-92 transistors at same output power. | Use Scenario: H-bridge half-bridge leg controlling 12 V, 300 mA cooling fan in industrial controller. IC Role / Device Role / Timing Role: Medium-power switching element toggling at 25 kHz PWM frequency. Use Value: 100 MHz fT ensures clean turn-on/turn-off edges, reducing EMI in motor commutation. |
| Linear Voltage Regulator Pass Element | LED Constant-Current Sink |
Use Scenario: Series pass transistor in adjustable 5–12 V, 800 mA linear regulator for analog sensor supply. IC Role / Device Role / Timing Role: Linearly biased NPN regulating output voltage via feedback loop. Use Value: 2 W Ptot allows 3 V dropout at 800 mA without heatsink in ambient ≤50°C. | Use Scenario: Constant-current sink for 3× high-brightness white LEDs in automotive interior lighting. IC Role / Device Role / Timing Role: Fixed-current switch controlled by precision shunt reference. Use Value: Tight hFE binning (BCP54-16) maintains ±5% LED current variation across temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN medium-power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZTX653 | Higher VCEO (60 V), lower hFE (20–100), TO-92 package | Limited to ≤500 mW due to TO-92 thermal resistance; unsuitable for sustained 1 A loads | Select only when higher breakdown voltage is critical and power < 0.5 W |
| MJD127 | Same SOT-223, but PNP complement; not functionally interchangeable | Used only in complementary push-pull pairs - requires matching BCP54TA for symmetry | Choose only as paired PNP counterpart, not standalone replacement |
Compared with ZTX653 and MJD127, BCP54TA uniquely balances 1 A current capability, 0.5 V saturation, and SOT-223 thermal performance - making it optimal for compact, self-heated AF output stages where TO-92 alternatives fail thermally.
Availability
BCP54TA is available at Aetrix Electronics and suitable for audio power amplifiers, DC motor drivers, linear voltage regulators, and LED constant-current sinks requiring stable component supply and consistent hFE binning.
Supply support for BCP54TA 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
Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal ICs for power management, signal integrity, and connectivity.
BCP54TA belongs to Diodes' SOT-223 medium-power bipolar transistor family, designed specifically for cost-sensitive, thermally constrained audio and industrial control applications requiring reliable gain-bin consistency and low saturation loss.
FAQ
What is the maximum safe operating current for BCP54TA in continuous DC mode?
The absolute maximum continuous collector current is 1 A at Tamb = 25°C with adequate PCB copper area (≥2.5 cm²) for heat spreading. At 75°C ambient, derating requires limiting IC to ≤650 mA to maintain junction temperature below 150°C per the thermal resistance specification of 62.5°C/W.
How does BCP54-10 differ from BCP54-16 in circuit design?
BCP54-10 has hFE = 40–100, suited for high-current, low-gain stages like emitter followers; BCP54-16 offers hFE = 100–250, preferred for voltage amplification or bias networks needing tighter gain tolerance. Both share identical voltage/current ratings and thermal specs.
Can BCP54TA replace BC847 in a small-signal amplifier?
No - BC847 is a low-power general-purpose NPN (100 mA IC, 45 V VCEO) in SOT-23, while BCP54TA is a medium-power device (1 A IC, SOT-223) optimized for higher current and thermal handling. Substitution risks PCB layout mismatch, excessive gain, and thermal runaway in small-signal nodes.
Is the exposed thermal pad (pin 4) electrically isolated?
No - pin 4 is internally connected to the collector (pin 3) and must be soldered to a grounded or collector-potential copper pour. Electrical isolation would compromise thermal performance and violate the device's construction; design must ensure no unintended shorting to adjacent traces or planes.
BCP54TA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-261-4, TO-261AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 1 A
- Voltage - Collector Emitter Breakdown (Max):
- 45 V
- Vce Saturation (Max) @ Ib, Ic:
- 500mV @ 50mA, 500mA
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 40 @ 150mA, 2V
- Power - Max:
- 2 W
- Frequency - Transition:
- 150MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223-3
BCP54TA FAQ
1.How can I place an order for BCP54TA through Aetrix?
Please submit a Request for Quotation (RFQ) for BCP54TA 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 BCP54TA reliable?
The price and inventory of BCP54TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BCP54TA is usually 5 days.
3.What payment methods are accepted for BCP54TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BCP54TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BCP54TA?
BCP54TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BCP54TA 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 BCP54TA?
For technical support, including BCP54TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BCP54TA requirements.
6.How does Aetrix verify that BCP54TA is sourced from the original manufacturer or authorized distributors?
All BCP54TA 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 BCP54TA meets industry standards.
7.What is the process for return or replacement of BCP54TA?
All BCP54TA units undergo pre-shipment inspection (PSI). If there is an issue with BCP54TA, 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 BCP54TA part is unused and in its original packaging.
Return procedure for BCP54TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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