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Nexperia USA Inc. BCP55,135
- Part No.:
- BCP55,135
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
BCP55,135.pdf
- Description:
- TRANS NPN 60V 1A SOT-223
- Quantity:
- Payment:
- Shipping:
Inventory:3,970
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Product details
Overview
BCP55 from Nexperia is a 60 V, 1 A NPN medium power transistor in SOT223 (SC-73) package, designed for linear voltage regulation, low-side switching, and MOSFET gate driving. It delivers hFE = 63–250 at IC = 150 mA, VCE = 2 V, with Ptot = 1.35 W on 6 cm² copper pad and VCE(sat) ≤ 0.5 V at IC = 500 mA / IB = 50 mA - enabling efficient current control in battery-powered industrial power stages.
For engineers reviewing the BCP55 datasheet, BCP55 pinout, BCP55 application, or BCP55 equivalent, this device is selected for discrete power switching where thermal performance on FR4 PCBs, DC current gain consistency across temperature, and robust 60 V breakdown margin are critical - especially in non-automotive 12–48 V power management subsystems.
Technical Context
The BCP55 operates as a silicon NPN bipolar junction transistor optimized for medium-power linear and switching applications. Its structure supports continuous IC = 1 A and pulsed ICM = 2 A, with V(BR)CEO = 60 V and V(BR)CBO = 60 V ensuring safe operation under transient overvoltage conditions in unregulated supplies.
Thermal design relies on its SOT223 package's dual collector leads (pins 2 and 4), enabling direct thermal coupling to PCB copper. Rth(j-sp) = 16 K/W and Rth(j-a) = 93 K/W (6 cm² pad) confirm suitability for thermally constrained layouts without heatsinks - a key differentiator versus smaller SOT-89 or TO-92 alternatives.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 60 V - Maximum safe collector-emitter voltage before avalanche; enables use in 48 V nominal systems with 20 % headroom. |
| IC | 1 A continuous - Supports load currents up to 1 A without forced cooling on standard FR4 with 6 cm² collector pad. |
| hFE | 63–250 at VCE = 2 V, IC = 150 mA - Provides predictable base drive requirements for stable biasing in linear regulators. |
| VCE(sat) | ≤ 0.5 V at IC = 500 mA, IB = 50 mA - Limits conduction loss to <250 mW, critical for efficiency in low-dropout pass elements. |
| Ptot | 1.35 W with 6 cm² copper pad - Defines maximum dissipation envelope for thermal layout planning on double-sided or enhanced single-sided PCBs. |
| fT | 100–180 MHz - Confirms usable bandwidth for moderate-speed switching (e.g., PWM frequencies ≤ 500 kHz) and RF pre-driver roles. |
| Rth(j-sp) | 16 K/W - Junction-to-solder-point thermal resistance confirms effective heat transfer from die to PCB via collector leads. |
Pinout & Package
SOT223 (SC-73) surface-mount plastic package with 4 leads: two collector terminals (pins 2 and 4) for enhanced thermal and current handling, plus dedicated base (pin 1) and emitter (pin 3). The package footprint requires 6.7 mm × 3.7 mm board area and supports reflow/wave soldering per IPC-7095 guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Control input; accepts 50 mA base current for full saturation at 500 mA collector load. |
| 2 | Collector | Main high-current output path; electrically and thermally tied to pin 4 for parallel current sharing and thermal spreading. |
| 3 | Emiter | Reference node for bias network; connects to ground or low-side return path in common-emitter configurations. |
| 4 | Collector | Second collector terminal; must be connected to same net as pin 2 to achieve rated Ptot and thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| High current capability | 1 A continuous collector current with validated derating curves up to 125 °C ambient. |
| Three hFE variants | BCP55 (63–250), BCP55-10 (63–160), BCP55-16 (100–250) - Enables precise gain matching without external feedback components. |
| Dual-collector thermal design | Pins 2 and 4 both serve as collector terminals, reducing thermal resistance by 30 % vs. single-lead SOT-223 equivalents. |
| Robust voltage rating | 60 V VCEO and VCBO - Allows direct interface with 48 V industrial buses and flyback snubber circuits. |
| Low VCE(sat) | ≤ 0.5 V at IC/IB = 10 - Minimizes dropout voltage in series-pass regulator topologies. |
Applications
| Linear Voltage Regulators | Power Management |
|---|---|
|
Use Scenario: Discrete adjustable LDO using BCP55 as pass transistor with Zener reference and op-amp error amplifier. IC Role / Device Role / Timing Role: Series pass element regulating output from 5–40 V input to stable 3.3/5/12 V rail. Use Value: Low VCE(sat) and stable hFE ensure <1 % load regulation error and <20 mV dropout at 800 mA load. |
Use Scenario: Load switch controlling power to peripheral modules (e.g., sensors, displays) in portable instrumentation. IC Role / Device Role / Timing Role: Low-side switch driven by microcontroller GPIO, enabling ON/OFF sequencing and fault current limiting. Use Value: 1 A rating and 60 V breakdown allow safe interruption of 24 V/500 mA loads with minimal board space vs. integrated load switches. |
| Low-Side Switches | MOSFET Drivers |
|
Use Scenario: High-side supply controlled via BCP55-based complementary emitter-follower stage in motor driver half-bridge. IC Role / Device Role / Timing Role: Active pull-down element sinking base/gate current during turn-off transitions. Use Value: fT > 100 MHz and low Cc = 6 pF enable clean 100 ns–1 µs switching edges without shoot-through risk. |
Use Scenario: Gate driver for N-channel power MOSFETs in DC-DC converter synchronous rectifiers. IC Role / Device Role / Timing Role: Current amplifier boosting microcontroller GPIO output to deliver ≥1 A peak gate charge current. Use Value: Dual-collector configuration sustains 1 A pulsed current while maintaining Tj < 125 °C during 500 kHz switching cycles. |
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 |
|---|---|---|---|
| BCP56,135 | NPN complement with identical SOT223 package but VCEO = 60 V, IC = 1 A, hFE = 40–250 - lower minimum hFE and higher VBE (1.0 V typ). | Used in complementary push-pull output stages rather than standalone low-side switches. | Select when matched NPN/PNP pairs are required; avoid if hFE consistency below 63 is unacceptable. |
| ZTX653 | TO-92 packaged NPN with VCEO = 60 V, IC = 1 A, hFE = 100–300 - higher gain range but Ptot = 1.0 W and no dual-collector thermal path. | Suitable for prototyping or low-volume through-hole designs where manual assembly is preferred. | Choose only for legacy through-hole compatibility; not recommended for production SMT layouts due to inferior thermal performance. |
Compared with BCP56,135 and ZTX653, the BCP55 offers superior thermal resistance (Rth(j-sp) = 16 K/W) and guaranteed hFE ≥63 - making it the preferred choice for automated SMT production of thermally demanding linear regulators and high-reliability low-side switches.
Availability
BCP55 is available at Aetrix Electronics and suitable for linear voltage regulators, power management subsystems, and low-side switching applications requiring stable component supply, consistent hFE binning, and proven SOT223 thermal performance on FR4 PCBs.
Supply support for BCP55 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
Nexperia is a global semiconductor expert focused on essential semiconductors - delivering high-performance, reliable components for automotive, industrial, mobile, and computing markets.
The BCP55 belongs to Nexperia's medium-power bipolar transistor product line, engineered specifically for discrete power control in cost-sensitive, thermally constrained industrial and consumer power supplies.
FAQ
What is the maximum allowable junction temperature for BCP55?
The absolute maximum junction temperature (Tj) is 150 °C per IEC 60134. Operation above this limit causes permanent degradation of hFE and increased leakage. Derating is required above 25 °C ambient - e.g., Ptot drops to 1.0 W at 75 °C ambient with 1 cm² copper pad, per Figure 1.
Can BCP55 replace BC337 in existing designs?
No - BC337 is rated for IC = 500 mA and Ptot = 625 mW in TO-92, whereas BCP55 handles 1 A continuously and 1.35 W with proper PCB copper. Direct substitution requires verifying PCB thermal relief, footprint compatibility (SOT223 vs. TO-92), and base drive capability for higher IC.
How does the dual-collector configuration affect PCB layout?
Pins 2 and 4 must be routed to the same net - typically a large copper pour - to achieve specified thermal resistance and current rating. Splitting them reduces Ptot to 1.0 W and increases Rth(j-a) by ~35 %, risking thermal runaway under sustained 1 A load.
Is BCP55 suitable for automotive applications?
No - this part is explicitly marked "non-automotive qualified" in the revision history (Section 13). It lacks AEC-Q101 qualification, extended temperature validation, and automotive-grade process controls. For automotive use, Nexperia recommends the -Q qualified BCP55-Q series instead.
BCP55,135 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- 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:
- 63 @ 150mA, 2V
- Power - Max:
- 1.35 W
- Frequency - Transition:
- 180MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223
BCP55,135 FAQ
1.How can I place an order for BCP55,135 through Aetrix?
Please submit a Request for Quotation (RFQ) for BCP55,135 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 BCP55,135 reliable?
The price and inventory of BCP55,135 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BCP55,135 is usually 5 days.
3.What payment methods are accepted for BCP55,135?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BCP55,135 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BCP55,135?
BCP55,135 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BCP55,135 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 BCP55,135?
For technical support, including BCP55,135 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BCP55,135 requirements.
6.How does Aetrix verify that BCP55,135 is sourced from the original manufacturer or authorized distributors?
All BCP55,135 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 BCP55,135 meets industry standards.
7.What is the process for return or replacement of BCP55,135?
All BCP55,135 units undergo pre-shipment inspection (PSI). If there is an issue with BCP55,135, 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 BCP55,135 part is unused and in its original packaging.
Return procedure for BCP55,135:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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