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Diodes Incorporated BCP55TA
- Part No.:
- BCP55TA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
BCP55TA.pdf
- Description:
- TRANS NPN 60V 1A SOT-223-3
- Quantity:
- Payment:
- Shipping:
Inventory:29,784
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Product details
Overview
BCP55TA from ON Semiconductor is an NPN silicon planar medium-power transistor in SOT-223 package, rated for 60 V VCEO, 1 A continuous collector current, and 2 W power dissipation at 25°C ambient. It delivers low 0.5 V VCE(sat) at IC=500 mA/IB=50 mA and hFE of 40–100 (BCP55-10) or 100–250 (BCP55-16), suited for audio frequency driver and output stage applications in industrial power supplies and motor control interfaces.
For engineers reviewing the BCP55TA datasheet, BCP55TA pinout, BCP55TA application, or BCP55TA equivalent, key selection factors include verified VCE(sat) performance under 500 mA load, hFE binning consistency across temperature, SOT-223 thermal resistance to PCB copper, and complementary pairing with BCP52 for push-pull amplifier topologies.
Technical Context
This transistor operates as a medium-power linear/switching NPN device with fixed-emitter bias configuration. Its 60 V VCEO and 1.5 A peak pulse rating support operation in DC-DC converter switching nodes and relay drivers requiring transient overcurrent tolerance.
The SOT-223 package provides direct thermal path from collector tab to PCB copper, enabling 2 W dissipation with ≥25 cm² 2-oz copper area. hFE binning (BCP55-10 vs. BCP55-16) reflects guaranteed minimum/maximum DC current gain at IC=150 mA and VCE=2 V, critical for stable bias design in Class-A/B amplifiers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 60 V - Maximum safe collector-emitter voltage before avalanche breakdown; sets upper rail limit in 48 V system switchers. |
| IC (continuous) | 1 A - Sustained collector current capability; defines max load drive in fan controllers or solenoid drivers. |
| VCE(sat) | 0.5 V @ IC=500 mA/IB =50 mA - Low saturation voltage reduces conduction loss and self-heating in linear regulators. |
| hFE range | 40–100 (BCP55-10) or 100–250 (BCP55-16) - Binned DC current gain ensures predictable base drive sizing across production lots. |
| Ptot | 2 W @ Tamb=25°C - Thermal limit achievable with SOT-223 pad layout per ON Semi AN1029 guidelines. |
| fT | 100 MHz @ IC=50 mA/VCE=10 V - Supports AF bandwidth up to ~10 kHz with adequate gain margin in emitter-follower buffers. |
Pinout & Package
SOT-223 package with exposed collector tab thermally connected to PCB copper; standard 4-pin outline (3 active + 1 thermal pad). Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector (tab), Pin 4 = Collector (lead).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Emitter | Reference node for base bias network; connects to ground or low-impedance return path in common-emitter switches. |
| Pin 2 | Base | Current-controlled input; requires series resistor sized for hFE-based IB target (e.g., 50 mA for 500 mA IC). |
| Pin 3 & Pin 4 | Collector (tab + lead) | Primary power output node; dual connection lowers thermal resistance and improves reliability under 1 A DC stress. |
Key Features
| Feature | Design Value |
|---|---|
| Low VCE(sat) | 0.5 V enables <1 W conduction loss at 500 mA, reducing heatsink requirements in space-constrained 24 V industrial modules. |
| hFE binning | Two gain grades (BCP55-10 / BCP55-16) allow precise base drive optimization without overdesigning driver stages. |
| 60 V breakdown rating | Supports direct interface with 48 V bus systems and flyback snubber circuits without external clamping diodes. |
| SOT-223 thermal pad | Exposed collector tab achieves ≤62°C/W junction-to-ambient (with 25 cm² copper), enabling 2 W operation without forced air. |
Applications
| Audio Frequency Driver | DC Motor Control Stage |
|---|---|
Use Scenario: Driving 8 Ω speaker loads in battery-powered portable audio amplifiers. IC Role / Device Role / Timing Role: NPN output stage in Class-B push-pull pair with complementary BCP52. Use Value: 0.5 V VCE(sat) minimizes distortion at 500 mA peak current and extends battery runtime by reducing I²R loss. | Use Scenario: H-bridge low-side switch for 12 V brushed DC motors in HVAC actuators. IC Role / Device Role / Timing Role: Medium-power NPN switch controlling motor winding current with PWM duty cycle. Use Value: 1 A IC rating supports 800 mA continuous motor current with 20% safety margin; SOT-223 pad handles intermittent 1.5 A pulses. |
| Industrial Power Supply | Relay Driver Interface |
Use Scenario: Regulator pass transistor in 5 V/1 A linear post-regulator for PLC I/O modules. IC Role / Device Role / Timing Role: Series-pass element dissipating up to 1.5 W during 24 V to 5 V conversion. Use Value: 2 W Ptot with proper PCB copper allows operation without heatsink; 60 V VCEO accommodates 24 V input transients. | Use Scenario: Driving 12 V/400 mA coil relays in building automation panels. IC Role / Device Role / Timing Role: Single-transistor relay driver with base resistor and flyback diode integration. Use Value: Verified 0.5 V VCE(sat) ensures relay pull-in at ≥11.5 V coil voltage even with 0.5 V PCB trace drop. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar medium-power NPN transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZTX653 | VCEO=60 V, IC=1 A, but hFE min=100 only; no binning; TO-92 package. | Lacks SOT-223 thermal performance; unsuitable for >0.8 W continuous dissipation without heatsink. | Select when board space permits TO-92 and thermal load stays below 0.7 W. |
| MJD112 | VCEO=80 V, IC=2 A, but VCE(sat)=1.5 V @ IC=1 A - higher conduction loss. | Higher voltage headroom but 3× higher saturation loss; better for 48 V surge protection, worse for efficiency-critical 12 V stages. | Select when 80 V breakdown is mandatory and 1.5 V VCE(sat) is acceptable in relay/motor drive. |
Compared with ZTX653 and MJD112, BCP55TA offers optimal balance of low VCE(sat), binned hFE, and SOT-223 thermal capability-making it preferred for compact, thermally constrained 12–24 V linear/switching stages where efficiency and gain predictability are critical.
Availability
BCP55TA is available at Aetrix Electronics and suitable for audio frequency drivers, DC motor control stages, industrial power supplies, and relay driver interfaces requiring stable component supply across high-volume manufacturing cycles.
Supply support for BCP55TA 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 focused on energy-efficient electronics, delivering discrete, analog, and logic solutions for automotive, industrial, and cloud power systems.
BCP55TA belongs to ON Semiconductor's medium-power bipolar transistor product line, engineered for reliable linear and switching operation in cost-sensitive industrial controls and consumer audio systems.
FAQ
What is the maximum allowable junction temperature for BCP55TA?
The absolute maximum junction temperature is +150°C, consistent with its specified operating temperature range. Derating begins at +25°C ambient: power dissipation must be reduced linearly to zero at +150°C case temperature, assuming typical SOT-223 PCB mounting per JEDEC standards.
Does BCP55TA require a heatsink in 1 A continuous operation?
No heatsink is required if the PCB provides ≥25 cm² of 2-ounce copper connected to the collector tab. At 1 A and 0.5 V VCE(sat), power dissipation is 0.5 W - well within the 2 W rating at 25°C ambient with adequate copper area.
How does hFE binning affect base resistor selection?
For BCP55-10 (hFE = 40–100), size the base resistor for hFE(min) = 40 to ensure saturation at worst-case gain; for BCP55-16 (hFE = 100–250), use hFE(min) = 100 - allowing smaller base current and lower driver loading.
Can BCP55TA replace BC337 in existing designs?
Only with layout and thermal review: BCP55TA's SOT-223 footprint differs from BC337's TO-92, and its 2 W rating exceeds BC337's 0.625 W. Electrical specs overlap, but thermal design and PCB pad changes are mandatory for drop-in replacement.
BCP55TA 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):
- 60 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
BCP55TA FAQ
1.How can I place an order for BCP55TA through Aetrix?
Please submit a Request for Quotation (RFQ) for BCP55TA 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 BCP55TA reliable?
The price and inventory of BCP55TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BCP55TA is usually 5 days.
3.What payment methods are accepted for BCP55TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BCP55TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BCP55TA?
BCP55TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BCP55TA 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 BCP55TA?
For technical support, including BCP55TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BCP55TA requirements.
6.How does Aetrix verify that BCP55TA is sourced from the original manufacturer or authorized distributors?
All BCP55TA 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 BCP55TA meets industry standards.
7.What is the process for return or replacement of BCP55TA?
All BCP55TA units undergo pre-shipment inspection (PSI). If there is an issue with BCP55TA, 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 BCP55TA part is unused and in its original packaging.
Return procedure for BCP55TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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