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Nexperia USA Inc. BC54PAS-QX
- Part No.:
- BC54PAS-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- 3-UDFN Exposed Pad
- Datasheet:
-
BC54PAS-QX.pdf
- Description:
- TRANS NPN 45V 1A DFN2020D-3
- Quantity:
- Payment:
- Shipping:
Inventory:9,125
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Product details
Overview
BC54PAS-QX from Nexperia is an AEC-Q101-qualified NPN medium power transistor in a DFN2020D-3 (SOT1061D) leadless package, rated for 45 V VCEO, 1 A continuous collector current, and 2 A peak pulse current. It delivers hFE of 63–250 at IC = 150 mA, features exposed thermal pad for enhanced heat dissipation, and is optimized for automotive-grade high-side switching and MOSFET driver stages.
For engineers reviewing the BC54PAS-QX datasheet, BC54PAS-QX pinout, BC54PAS-QX application, or BC54PAS-QX equivalent, this page provides verified pin functions, thermal derating curves, AOI-compatible solder joint design guidance, AEC-Q101 qualification status, and validated alternatives for linear regulators, battery-powered systems, and power management circuits.
Technical Context
This transistor operates as a medium-power NPN switch with base-controlled current amplification. Its DFN2020D-3 package integrates side-wettable flanks for automated optical inspection and a thermally enhanced bottom pad enabling up to 1.65 W total power dissipation on 4-layer FR4 PCBs.
It supports pulsed operation up to 2 A (tp ≤ 1 ms), exhibits fT = 100–180 MHz at 50 mA, and maintains stable hFE across −55 °C to 150 °C ambient range - critical for under-hood automotive power stages and battery management system drivers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 45 V - Maximum safe collector-emitter voltage under open-base condition; defines upper rail limit in 12 V/24 V automotive switching applications. |
| IC (continuous) | 1 A - Sustained DC collector current capability; supports load switching in linear regulators and gate drivers without forced cooling. |
| hFE | 63–250 - Current gain range at VCE = 2 V, IC = 150 mA; enables predictable base drive sizing for saturation control in high-side configurations. |
| VCE(sat) | ≤ 500 mV at IC = 500 mA, IB = 50 mA - Low saturation voltage minimizes conduction loss and self-heating in power stage output stages. |
| Rth(j-a) | 76 K/W - Junction-to-ambient thermal resistance on 4-layer FR4 with 1 cm² collector pad; enables thermal design margin for 1 W dissipation at Tamb = 75 °C. |
| fT | 100–180 MHz - Transition frequency at VCE = 5 V, IC = 50 mA; supports fast switching in PWM-driven MOSFET gate drivers. |
| Ptot | 1.65 W - Max power dissipation on 4-layer FR4 with 1 cm² collector pad; sets practical DC power handling limit before thermal throttling. |
Pinout & Package
Package: DFN2020D-3 (SOT1061D), ultra-thin 2.0 mm × 2.0 mm × 0.65 mm body with side-wettable flanks and exposed thermal pad (collector-connected). Designed for reflow soldering per IPC-J-STD-020, compatible with AOI.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base (B) | Control input terminal; requires ~50 mA base drive for full saturation at 500 mA collector current. |
| 2 | Emitter (E) | Current return path; internally connected to substrate; must be tied to ground or low-side reference in high-side switch topology. |
| 3 | Collector (C) | Main power output terminal; electrically and thermally connected to exposed bottom pad; carries full load current and dissipates majority of heat. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Qualified for automotive applications per stress test standard; supports deployment in engine control, body electronics, and ADAS power subsystems without additional reliability screening. |
| Side-wettable flanks (SWF) | Enables automated optical inspection of solder joints on all three terminals - eliminates X-ray requirement for production line quality assurance. |
| Exposed collector pad | Provides direct thermal path to PCB copper; reduces Rth(j-a) by up to 58% vs. standard SOT-23, improving power density in space-constrained modules. |
| Two hFE variants | BC54PAS-Q (63–250) and BC54-10PAS-Q (63–160) allow precise gain matching for analog feedback loops or consistent switching thresholds across production batches. |
| Low VCE(sat) | ≤500 mV ensures <1.25 W conduction loss at 2.5 A switched load (with forced β = 10); critical for efficiency in always-on battery management circuits. |
Applications
| Linear Voltage Regulators | Battery-Driven Devices |
|---|---|
|
Use Scenario: Pass transistor in adjustable LDOs delivering 3.3 V/1 A from 12 V automotive supply. IC Role / Device Role / Timing Role: NPN series pass element controlling output voltage via base bias network; handles full load current and thermal stress. Use Value: 45 V rating accommodates load dump transients; 1.65 W Ptot allows operation without heatsink at 75 °C ambient. |
Use Scenario: Load switch enabling/disabling 5 V rail in portable medical monitors powered by Li-ion batteries. IC Role / Device Role / Timing Role: High-side power switch controlled by microcontroller GPIO; provides reverse-polarity and overcurrent protection interface. Use Value: Low 500 mV VCE(sat) limits dropout to <0.5 V at 1 A, preserving battery runtime and minimizing thermal rise in sealed enclosures. |
| MOSFET Drivers | Power Management |
|
Use Scenario: Level-shifting stage driving N-channel high-side MOSFET in buck converter gate drive circuit. IC Role / Device Role / Timing Role: Fast-switching NPN buffer amplifying MCU PWM signal to 12 V logic level; supplies >1 A peak gate charge current. Use Value: 180 MHz fT ensures <50 ns propagation delay; 2 A ICM safely handles gate charge surges during hard switching. |
Use Scenario: Current-sense amplifier front-end in automotive HVAC blower motor controller. IC Role / Device Role / Timing Role: Transimpedance amplifier transistor converting shunt voltage to amplified output; operates in linear region with stable hFE. Use Value: 63–250 hFE range enables calibrated gain setting; AEC-Q101 qualification guarantees operation across −40 °C to 125 °C junction 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 |
|---|---|---|---|
| BC847BW,115 | Smaller SOT-323 package (0.65 W Ptot), lower IC = 100 mA, no AEC-Q101 qualification. | Not suitable for automotive or >500 mA loads; limited thermal headroom in power stages. | Select only for non-automotive consumer PCBs where board space is critical and power < 0.5 W. |
| ZTX653STZ | TO-261AA package (3.5 W Ptot), higher VCEO = 60 V, but larger footprint and no SWF/AOI support. | Requires manual inspection or X-ray; incompatible with high-volume AOI lines. | Choose when >1.65 W dissipation is needed and board area permits TO-261AA mounting. |
Compared with BC847BW and ZTX653STZ, BC54PAS-QX uniquely balances AEC-Q101 compliance, AOI-ready packaging, 1 A continuous current, and 2.0 mm × 2.0 mm footprint - making it optimal for automotive power management modules requiring zero-defect manufacturing and thermal robustness.
Availability
BC54PAS-QX is available at Aetrix Electronics and suitable for linear voltage regulators, battery-driven devices, and MOSFET drivers requiring stable component supply in automotive, industrial, and medical OEM programs.
Supply support for BC54PAS-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 specializing in high-performance, reliable discrete, logic, and MOSFET devices, with leadership in automotive-qualified components and advanced packaging technologies.
The BC54xPAS-Q series belongs to Nexperia's AEC-Q101-qualified medium-power transistor product line, engineered specifically for automotive power management, high-side switching, and driver applications demanding thermal efficiency and process reliability.
FAQ
What is the maximum allowable junction temperature for BC54PAS-QX?
The absolute maximum junction temperature (Tj) is 150 °C per IEC 60134 limiting values. Operation above this threshold risks permanent parametric shift or failure. Derating is required above 25 °C ambient - for example, maximum continuous power drops to ~1.1 W at 75 °C ambient on a 4-layer FR4 board with 1 cm² collector pad.
Is BC54PAS-QX pin-compatible with BC547 or BC548 through-hole transistors?
No - BC54PAS-QX uses a 3-pin DFN2020D-3 surface-mount package with pin 1 = Base, pin 2 = Emitter, pin 3 = Collector. Through-hole BC547/BC548 use TO-92 with different pinout (E-B-C) and thermal/mechanical characteristics. Direct replacement requires PCB redesign and thermal validation.
Does BC54PAS-QX require special reflow profile settings due to its DFN package?
Yes - the DFN2020D-3 package demands adherence to IPC-J-STD-020 moisture sensitivity level (MSL) 1 guidelines and a peak reflow temperature of 260 °C for ≤ 30 seconds. The side-wettable flanks require precise stencil aperture design (0.25 mm thickness, 0.35 mm × 0.5 mm openings) to ensure coplanar solder fillets visible to AOI cameras.
Can BC54PAS-QX be used in linear amplifier configurations?
Yes - its hFE stability (63–250) across IC = 5 mA to 500 mA and low VCE(sat) support Class-A and AB amplifier topologies. However, linear operation above 500 mW requires thermal management: on FR4 with 1 cm² collector pad, maximum undervoltaged dissipation is ~1.1 W at 75 °C ambient to maintain Tj ≤ 130 °C.
BC54PAS-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):
- 45 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
BC54PAS-QX FAQ
1.How can I place an order for BC54PAS-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BC54PAS-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 BC54PAS-QX reliable?
The price and inventory of BC54PAS-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC54PAS-QX is usually 5 days.
3.What payment methods are accepted for BC54PAS-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC54PAS-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC54PAS-QX?
BC54PAS-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC54PAS-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 BC54PAS-QX?
For technical support, including BC54PAS-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC54PAS-QX requirements.
6.How does Aetrix verify that BC54PAS-QX is sourced from the original manufacturer or authorized distributors?
All BC54PAS-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 BC54PAS-QX meets industry standards.
7.What is the process for return or replacement of BC54PAS-QX?
All BC54PAS-QX units undergo pre-shipment inspection (PSI). If there is an issue with BC54PAS-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 BC54PAS-QX part is unused and in its original packaging.
Return procedure for BC54PAS-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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