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Nexperia USA Inc. BC55PAS-QX
- Part No.:
- BC55PAS-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- 3-UDFN Exposed Pad
- Datasheet:
-
BC55PAS-QX.pdf
- Description:
- TRANS NPN 60V 1A DFN2020D-3
- Quantity:
- Payment:
- Shipping:
Inventory:8,180
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Product details
Overview
BC55PAS-QX from Nexperia is an AEC-Q101-qualified NPN medium power transistor in a DFN2020D-3 (SOT1061D) leadless package, rated for 60 V VCEO, 1 A continuous IC, and 2 A peak ICM. It delivers hFE of 63–250 at VCE = 2 V / IC = 150 mA and supports automotive-grade linear voltage regulators, MOSFET drivers, and high-side switches.
For engineers reviewing the BC55PAS-QX datasheet, BC55PAS-QX pinout, BC55PAS-QX application, or BC55PAS-QX equivalent, this page provides verified thermal resistance values (Rth(j-a) down to 76 K/W), side-wettable flank compatibility for AOI, exposed collector pad for thermal management, and AEC-Q101 qualification status - all critical for automotive power stage design and PCB layout validation.
Technical Context
This NPN bipolar junction transistor operates with VCEO = 60 V and VCBO = 60 V, enabling use in 48 V automotive systems and industrial power rails. Its pulsed fT of 100–180 MHz supports fast switching in driver stages, while VCE(sat) ≤ 500 mV at IC = 500 mA / IB = 50 mA ensures low conduction loss in saturated-switch applications.
The device uses a thermally enhanced DFN2020D-3 package with solderable side flanks and an exposed collector pad, delivering Rth(j-sp) = 20 K/W to solder point and Rth(j-a) as low as 76 K/W on 4-layer FR4 with 1 cm² collector pad - directly supporting thermal reliability in space-constrained automotive modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 60 V - supports 48 V nominal automotive bus operation with 25 % headroom for transients |
| IC (continuous) | 1 A - sufficient for driving gate capacitance of medium-power MOSFETs or regulating 500 mA loads |
| hFE | 63–250 - enables stable current gain across 5 mA–500 mA range, reducing base drive complexity |
| VCE(sat) | ≤ 500 mV @ IC/IB = 10 - minimizes power dissipation in linear and saturated-switch modes |
| Rth(j-a) | 76 K/W (4-layer PCB + 1 cm² pad) - allows >1.1 W continuous dissipation at Tamb = 105 °C |
| fT | 100–180 MHz - supports high-speed switching in PWM drivers and signal amplification up to ~100 MHz |
| Package | DFN2020D-3 (SOT1061D), 2.0 × 2.0 × 0.65 mm - ultra-thin, AOI-compatible, with side-wettable flanks |
Pinout & Package
BC55PAS-QX is housed in a 3-terminal DFN2020D-3 (SOT1061D) leadless plastic package with an exposed collector pad for thermal and electrical conduction. The package features side-wettable flanks for automated optical inspection and is optimized for reflow soldering on FR4 PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base (B) | Control terminal; accepts 50 mA base current for full saturation at 500 mA collector load |
| 2 | Emitter (E) | Current return path; internally connected to substrate ground plane in standard configuration |
| 3 | Collector (C) | Power output terminal; exposed pad serves as primary thermal path and high-current sink |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive under stress test conditions including HTGB, HTRB, and temperature cycling |
| Side-wettable flanks | Enables 100 % automated optical inspection (AOI) of solder joints without X-ray |
| Exposed collector pad | Provides direct thermal path to PCB copper, reducing Rth(j-a) by up to 55 % vs. standard SOT packages |
| Two hFE variants | BC55PAS-Q (63–250), BC55-16PAS-Q (100–250) - simplifies gain binning for precision biasing |
| Ultra-thin profile | 0.65 mm max height - enables stacking in multi-layer modules and compact ECU designs |
Applications
| Linear Voltage Regulators | Battery-Driven Devices |
|---|---|
Use Scenario: Pass transistor in adjustable LDOs for infotainment power domains. IC Role / Device Role / Timing Role: NPN pass element controlling output voltage via base-emitter bias network. Use Value: Low VCE(sat) (≤500 mV) reduces dropout voltage and improves efficiency at 1 A load. |
Use Scenario: Load switch for USB-C PD accessory detection circuitry. IC Role / Device Role / Timing Role: High-side enable switch isolating downstream 3.3 V rail during standby. Use Value: AEC-Q101 rating ensures reliability in automotive portable tools and telematics dongles. |
| MOSFET Drivers | Power Management |
Use Scenario: Totem-pole stage driving N-channel MOSFET gates in BLDC motor controllers. IC Role / Device Role / Timing Role: Fast-switching NPN pull-down element complementing PNP high-side driver. Use Value: fT ≥ 100 MHz supports clean 100 kHz PWM edge transitions with <100 ns rise/fall. |
Use Scenario: Current-sense amplifier front-end in battery protection ICs. IC Role / Device Role / Timing Role: Transimpedance gain stage converting shunt voltage to amplified output. Use Value: Stable hFE over -40 °C to 125 °C maintains accuracy across automotive temperature range. |
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 |
|---|---|---|---|
| BC847BW-Q | Smaller SOT323 package (1.3 × 1.3 mm); lower IC = 100 mA; hFE = 110–800 | Not suitable for 1 A load switching; limited thermal capability (Rth(j-a) ≈ 300 K/W) | Select when board space is critical and load current ≤100 mA; not drop-in for BC55PAS-QX's power role. |
| ZTX951 | TO-92 package; higher VCEO = 100 V; IC = 1 A; Rth(j-a) = 150 K/W (no exposed pad) | Through-hole mounting only; lacks AOI support and thermal performance for dense automotive PCBs | Choose for legacy through-hole designs or where higher breakdown voltage is mandatory; not surface-mount compatible. |
Compared with BC847BW-Q and ZTX951, BC55PAS-QX uniquely combines AEC-Q101 qualification, 1 A continuous current, ultra-thin DFN packaging with side-wettable flanks, and Rth(j-a) as low as 76 K/W - making it the only option qualified for high-density, thermally demanding automotive power control functions.
Availability
BC55PAS-QX is available at Aetrix Electronics and suitable for automotive ECUs, battery management systems, and industrial power regulators requiring stable component supply, AEC-Q101 compliance, and high thermal performance in ultra-compact layouts.
Supply support for BC55PAS-QX 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 discrete, logic, and MOSFET devices for automotive, industrial, and consumer markets.
BC55PAS-QX belongs to Nexperia's AEC-Q101-qualified BC55xPAS-Q series, designed specifically for automotive power control applications requiring robust thermal performance, AOI compatibility, and medium-power switching in ultra-thin surface-mount packages.
FAQ
What is the maximum allowable junction temperature for BC55PAS-QX?
The absolute maximum junction temperature (Tj) is 150 °C per IEC 60134 limiting values. Operation above this threshold risks permanent degradation. Derating curves in the datasheet show usable power dissipation drops to zero at 150 °C ambient when mounted on standard FR4, so thermal design must maintain Tj ≤ 150 °C under worst-case load and ambient conditions.
Does BC55PAS-QX support automatic optical inspection (AOI)?
Yes - its DFN2020D-3 package features side-wettable flanks that reflect light uniformly during AOI, enabling 100 % solder joint verification without X-ray. This is confirmed in Section 2 of the datasheet and validated per IPC-A-610 Class 3 requirements for automotive electronics assembly.
How does the exposed collector pad affect PCB layout?
The exposed collector pad must be connected to a dedicated copper pour (≥1 cm² recommended) on the PCB's top layer, thermally vias to inner ground/power planes, and matching footprint per Figure 12 in the datasheet. Omitting this compromises thermal resistance by up to 2× and may cause premature thermal shutdown in 1 A continuous operation.
Is BC55PAS-QX pin-compatible with other BC55xPAS-Q variants?
Yes - BC55PAS-Q, BC55-10PAS-Q, and BC55-16PAS-Q share identical DFN2020D-3 pinout (B-E-C), marking codes (CG/CH/CJ), and mechanical dimensions. Only hFE bins differ: 63–250, 63–160, and 100–250 respectively. No layout change is needed when selecting between them for gain optimization.
BC55PAS-QX 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-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DFN2020D-3
BC55PAS-QX FAQ
1.How can I place an order for BC55PAS-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BC55PAS-QX 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 BC55PAS-QX reliable?
The price and inventory of BC55PAS-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC55PAS-QX is usually 5 days.
3.What payment methods are accepted for BC55PAS-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC55PAS-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC55PAS-QX?
BC55PAS-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC55PAS-QX 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 BC55PAS-QX?
For technical support, including BC55PAS-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC55PAS-QX requirements.
6.How does Aetrix verify that BC55PAS-QX is sourced from the original manufacturer or authorized distributors?
All BC55PAS-QX 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 BC55PAS-QX meets industry standards.
7.What is the process for return or replacement of BC55PAS-QX?
All BC55PAS-QX units undergo pre-shipment inspection (PSI). If there is an issue with BC55PAS-QX, 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 BC55PAS-QX part is unused and in its original packaging.
Return procedure for BC55PAS-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC55PAS-QX Tags
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