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Nexperia USA Inc. BC55-10PASX
- Part No.:
- BC55-10PASX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- 3-UDFN Exposed Pad
- Datasheet:
-
BC55-10PASX.pdf
- Description:
- TRANS NPN 60V 1A DFN2020D-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,449
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Product details
Overview
BC55-10PASX from Nexperia is a 60 V, 1 A NPN medium power transistor in an ultra-thin DFN2020D-3 (SOT1061D) leadless SMD package, designed for high-side switching and MOSFET driver stages in compact power management circuits, with hFE of 63–160 at IC = 150 mA, VCE = 2 V, and thermal resistance Rth(j-a) as low as 76 K/W on 4-layer FR4 PCBs.
For engineers reviewing the BC55-10PASX datasheet, BC55-10PASX pinout, BC55-10PASX application, or BC55-10PASX equivalent, this device is selected for space-constrained linear regulators, battery-powered load switches, and discrete amplifier stages where side-wettable flanks enable AOI-compatible solder joint inspection and enhanced thermal dissipation.
Technical Context
This NPN bipolar junction transistor operates in active and saturation regions for analog amplification and digital switching. Its design supports pulsed collector currents up to 2 A (tp ≤ 1 ms) and DC current gain stability across −55 °C to 150 °C ambient range, with base-emitter voltage ≤1 V at IC = 500 mA.
The DFN2020D-3 package integrates exposed collector pad for direct thermal conduction to PCB copper, enabling power dissipation up to 1.65 W under optimized 4-layer board conditions. Transient thermal impedance drops to ~20 K/W at short pulse durations (tp < 100 µs), supporting high-duty-cycle switching in power management IC front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 60 V - Maximum safe collector-emitter voltage with open base; defines upper rail limit in high-side switch designs. |
| IC | 1 A - Continuous DC collector current rating; sets maximum steady-state load drive capability. |
| hFE | 63–160 - DC current gain at VCE = 2 V, IC = 150 mA; determines required base drive current for saturation. |
| VCE(sat) | ≤500 mV - Collector-emitter saturation voltage at IC = 500 mA, IB = 50 mA; directly impacts conduction loss in switching applications. |
| fT | 100–180 MHz - Transition frequency at VCE = 5 V, IC = 50 mA; indicates usable bandwidth for small-signal amplification. |
| Rth(j-a) | 76 K/W - Junction-to-ambient thermal resistance on 4-layer FR4 with 1 cm² collector pad; enables reliable operation at elevated ambient temperatures. |
Pinout & Package
BC55-10PASX uses the DFN2020D-3 (SOT1061D) ultra-thin 2 mm × 2 mm × 0.65 mm leadless package with side-wettable flanks for automated optical inspection and improved thermal transfer via exposed collector pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base (B) | Control terminal; requires ≥50 mA base current to saturate at 500 mA collector load. |
| 2 | Emitter (E) | Current return path; internally connected to substrate; must be tied to lowest potential in high-side configuration. |
| 3 | Collector (C) | Power output terminal; electrically and thermally coupled to exposed bottom pad for PCB heat sinking. |
Key Features
| Feature | Design Value |
|---|---|
| Exposed collector pad | Enables direct thermal coupling to PCB copper, reducing Rth(j-a) by up to 55% vs. standard SOT-23 packages. |
| Side-wettable flanks | Facilitates 100% automated optical inspection (AOI) of solder joints without X-ray, improving manufacturing yield. |
| Two hFE bins | BC55-10PASX (63–160) and BC55-16PASX (100–250) allow precise gain matching in parallel or feedback-critical circuits. |
| Ultra-thin profile | 0.65 mm max height enables use in ultra-low-profile portable devices and stacked PCB assemblies. |
Applications
| Linear Voltage Regulators | Battery-Driven Devices |
|---|---|
|
Use Scenario: Discrete pass transistor in adjustable LDOs delivering up to 1 A output current with thermal foldback protection. IC Role / Device Role / Timing Role: NPN series pass element controlling output voltage via base bias network and error amplifier feedback. Use Value: Low VCE(sat) minimizes dropout voltage; exposed collector pad sustains 1.1 W dissipation at 75 °C ambient without heatsink. |
Use Scenario: Load switch for Li-ion battery-powered IoT sensors, enabling firmware-controlled power gating. IC Role / Device Role / Timing Role: High-side switch isolating downstream circuitry from battery during sleep mode. Use Value: 60 V VCEO headroom accommodates battery charging transients; side-wettable flanks ensure AOI-verified solder integrity in high-volume assembly. |
| MOSFET Drivers | Power Management |
|
Use Scenario: Bootstrap or level-shift stage driving N-channel high-side MOSFETs in DC-DC converters. IC Role / Device Role / Timing Role: Fast-switching NPN buffer amplifying gate drive signals while isolating control logic from power rail noise. Use Value: fT > 100 MHz ensures sub-10 ns rise/fall times; low Cc (6 pF) prevents gate drive distortion at 1 MHz switching frequencies. |
Use Scenario: Current-sense amplifier front-end or overcurrent protection latch in industrial PMIC modules. IC Role / Device Role / Timing Role: Precision current mirror or shunt-based sensing element with stable hFE over temperature. Use Value: hFE variation < ±15% from −40 °C to 125 °C enables accurate current replication without calibration; 150 °C Tj rating supports operation near hot components. |
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 |
|---|---|---|---|
| BC55-16PASX | Higher hFE bin (100–250 vs. 63–160); identical package, voltage, and current ratings. | Better suited for low-base-drive applications like microcontroller-driven switches where IB < 10 mA is required. | Select when minimizing base current is critical and tighter hFE tolerance is needed for consistent saturation. |
| BC817-40Q | SOT-23 package (3.04 mm × 1.4 mm); lower power dissipation (0.5 W), higher Rth(j-a) (~250 K/W), same VCEO/IC. | Limited to low-power signal switching; unsuitable for >300 mA continuous loads or thermal-intensive regulator roles. | Choose only for cost-sensitive, non-thermal-critical signal routing where PCB area is less constrained than height. |
Compared with BC55-16PASX and BC817-40Q, BC55-10PASX offers optimal balance of gain consistency, thermal performance, and ultra-thin packaging-making it preferred for space- and thermally constrained high-side switching where moderate base drive and AOI compatibility are mandatory.
Availability
BC55-10PASX is available at Aetrix Electronics and suitable for linear voltage regulators, battery-driven devices, and MOSFET drivers requiring stable component supply, long-term lifecycle support, and RoHS-compliant leadless packaging.
Supply support for BC55-10PASX 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 high-volume, high-reliability discrete and logic devices, with leadership in automotive, industrial, and mobile applications.
The BC55xPAS series targets compact, thermally demanding power management functions-designed specifically for high-density PCBs where ultra-thin DFN packaging, AOI compatibility, and robust thermal performance are essential.
FAQ
What is the maximum allowable junction temperature for BC55-10PASX?
The absolute maximum junction temperature (Tj) is 150 °C per IEC 60134 limiting values. Operation above this threshold risks permanent degradation of hFE and increased leakage. Derating curves in Figure 1 confirm sustained operation at 1.10 W only below 75 °C ambient on single-layer FR4, requiring thermal design validation for each board stack-up.
Can BC55-10PASX replace BC54-10PASX in existing designs?
No-BC54-10PASX is a PNP counterpart with complementary polarity, VECO = 60 V, and mirrored pinout (emitter on pin 1). Swapping would reverse current flow and disable circuit functionality. The BC55-10PASX is not a drop-in replacement; redesign of biasing and layout is required for NPN-to-PNP conversion.
Is BC55-10PASX qualified for automotive applications?
No-per Revision History section 13, this part is explicitly marked "non-automotive qualification" (v.3, 20241009). Automotive-grade equivalents (e.g., BC55-10PAS-Q) follow AEC-Q101 stress testing and require separate qualification documentation; using BC55-10PASX in safety-critical vehicle systems violates Nexperia's suitability disclaimer.
How does the side-wettable flank design affect reflow soldering?
The side-wettable flanks align with IPC-7351B standards and require a specific reflow footprint (Figure 12): 0.35 mm wide solder lands with 0.25 mm solder mask clearance. Proper stencil aperture (0.12 mm thickness, 0.3 mm × 0.3 mm) ensures controlled solder volume to form visible fillets for AOI-underfill causes insufficient wetting; overfill creates bridging between pins 1 and 3.
BC55-10PASX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- 3-UDFN Exposed Pad
- 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:
- 420 mW
- Frequency - Transition:
- 180MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DFN2020D-3
BC55-10PASX FAQ
1.How can I place an order for BC55-10PASX through Aetrix?
Please submit a Request for Quotation (RFQ) for BC55-10PASX 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 BC55-10PASX reliable?
The price and inventory of BC55-10PASX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC55-10PASX is usually 5 days.
3.What payment methods are accepted for BC55-10PASX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC55-10PASX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC55-10PASX?
BC55-10PASX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC55-10PASX 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 BC55-10PASX?
For technical support, including BC55-10PASX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC55-10PASX requirements.
6.How does Aetrix verify that BC55-10PASX is sourced from the original manufacturer or authorized distributors?
All BC55-10PASX 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 BC55-10PASX meets industry standards.
7.What is the process for return or replacement of BC55-10PASX?
All BC55-10PASX units undergo pre-shipment inspection (PSI). If there is an issue with BC55-10PASX, 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 BC55-10PASX part is unused and in its original packaging.
Return procedure for BC55-10PASX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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