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Nexperia USA Inc. BC54PA-QX
- Part No.:
- BC54PA-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- 3-PowerUDFN
- Datasheet:
-
BC54PA-QX.pdf
- Description:
- TRANS NPN 45V 1A 3HUSON
- Quantity:
- Payment:
- Shipping:
Inventory:5,562
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Product details
Overview
BC54PA-QX from Nexperia is an AEC-Q101-qualified NPN medium power transistor in SOT1061 ultra-thin leadless package, rated for 45 V VCEO, 1 A continuous IC, and 2 A peak ICM. It delivers hFE of 63–250 at IC = 150 mA, supports automotive-grade linear voltage regulation and MOSFET driver stages, and operates across −55 °C to +150 °C junction temperature.
For engineers reviewing the BC54PA-QX datasheet, BC54PA-QX pinout, BC54PA-QX application, or BC54PA-QX equivalent, this page provides verified pin functions, thermal derating curves, AEC-Q101 qualification status, hFE binning details (AT marking), and validated alternatives for low-side switching and power management designs.
Technical Context
This transistor operates as a single NPN silicon bipolar junction device with open-base VCEO = 45 V and VCB0 = 45 V, enabling robust operation in 12 V/24 V automotive supply rails. Its 0.5 V VCEsat at IC = 500 mA / IB = 50 mA ensures low conduction loss in saturated switch configurations.
Thermal performance is defined by Rth(j-a) = 76 K/W (4-layer PCB, 1 cm² collector pad) and Rth(j-sp) = 20 K/W, supporting sustained 1.65 W dissipation under optimized layout. The 180 MHz fT and 6 pF Cc support stable high-frequency switching up to ~10 MHz in driver applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 45 V - Maximum safe collector-emitter voltage with base open; defines rail compatibility with 36 V automotive systems. |
| IC (continuous) | 1 A - Continuous DC collector current rating; sets maximum steady-state load drive capability. |
| ICM (peak) | 2 A - Single-pulse current limit (tp ≤ 1 ms); enables short-term surge handling in motor or solenoid drivers. |
| hFE | 63–250 - DC current gain range at VCE = 2 V, IC = 150 mA; determines required base drive for saturation control. |
| VCEsat | ≤ 0.5 V - Collector-emitter saturation voltage at IC/IB = 10; directly impacts power loss and thermal rise in switching mode. |
| fT | 180 MHz - Transition frequency at VCE = 5 V, IC = 50 mA; indicates usable bandwidth for high-speed digital or analog amplification. |
| Rth(j-a) | 76 K/W - Junction-to-ambient thermal resistance on 4-layer FR4 with 1 cm² collector pad; enables accurate board-level thermal modeling. |
Pinout & Package
SOT1061 is a 3-terminal, leadless, ultra-thin (0.65 mm max height) plastic surface-mount package with 2 mm × 2 mm body footprint and exposed collector thermal pad. It features tin-plated terminations compatible with standard reflow profiles (J-STD-020).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base (B) | Current-controlled input node; requires ≥50 mA base drive for full saturation at 500 mA collector load. |
| 2 | Emitter (E) | Reference terminal for biasing; connected to system ground or low-side return path in common-emitter configuration. |
| 3 | Collector (C) | Main power output node; electrically and thermally tied to exposed bottom pad for enhanced heat transfer to PCB. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Qualified for automotive applications per stress test standard; supports PPAP documentation and zero-defect reliability targets. |
| Three hFE bins | BC54PA-Q (63–250), BC54-10PA-Q (63–160), BC54-16PA-Q (100–250); enables precise gain matching in feedback or current-sensing circuits. |
| High Ptot | 1.65 W on 4-layer PCB with 1 cm² collector pad; allows higher power density vs. legacy SOT23/SOT223 packages. |
| Low-profile thermal design | 0.65 mm max height with exposed collector pad; reduces mechanical interference in stacked or space-constrained modules. |
| FR4-compatible footprint | Standardized solder land pattern (Fig. 12) with 0.5 mm pitch; supports automated optical inspection and high-yield reflow. |
Applications
| Linear Voltage Regulators | MOSFET Drivers |
|---|---|
|
Use Scenario: Pass transistor in adjustable LDOs delivering 1–3 A output current with <1 % line/load regulation. IC Role / Device Role / Timing Role: NPN series pass element controlling output voltage via base bias from error amplifier. Use Value: 45 V VCEO accommodates wide input ranges (e.g., 9–36 V automotive); 0.5 V VCEsat minimizes dropout and thermal overhead. |
Use Scenario: Gate driver stage for N-channel power MOSFETs in BLDC motor controllers or DC-DC converters. IC Role / Device Role / Timing Role: Low-side level-shifting switch turning gate drive signal on/off with fast edge control. Use Value: 180 MHz fT and 6 pF Cc ensure <100 ns turn-on/turn-off times; 2 A ICM handles gate charge surges during hard switching. |
| Low-Side Switches | Battery-Powered Power Management |
|
Use Scenario: Load switch for 12 V battery-fed subsystems (e.g., infotainment backlight, HVAC actuators). IC Role / Device Role / Timing Role: Saturated NPN switch connecting load to ground under microcontroller GPIO control. Use Value: AT-marked hFE bin guarantees ≥63 gain at 150 mA, ensuring reliable saturation with ≤2.5 mA base drive from 3.3 V MCU. |
Use Scenario: Power path controller in portable medical devices or industrial handhelds using Li-ion or 2S packs. IC Role / Device Role / Timing Role: Reverse-polarity protection and inrush limiting transistor in primary power rail. Use Value: −55 °C to +150 °C operating range supports extended outdoor use; AEC-Q101 qualification validates long-term reliability under thermal cycling. |
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 |
|---|---|---|---|
| BC817-40-Q | Same SOT1061 package, but hFE = 250–630 (higher gain bin); lower VCEO = 45 V, same IC = 1 A. | Higher gain reduces required base drive but increases sensitivity to leakage in high-temp environments. | Select when precise low-base-current biasing is needed and thermal margin permits higher hFE-induced variability. |
| ZTX653 | TO-92 package (through-hole), VCEO = 60 V, IC = 1 A, hFE = 100–300; no AEC-Q101 qualification. | Larger footprint and no automotive qualification limit use to non-automotive industrial or prototyping contexts. | Choose only for legacy through-hole designs or where manual assembly and higher voltage margin outweigh surface-mount and qualification needs. |
Compared with BC817-40-Q and ZTX653, BC54PA-QX offers optimal balance of AEC-Q101 compliance, ultra-thin SMT form factor, and controlled hFE spread-making it preferred for volume automotive electronics where board space, thermal performance, and qualification traceability are critical.
Availability
BC54PA-QX is available at Aetrix Electronics and suitable for linear voltage regulators, MOSFET drivers, and low-side switches requiring stable component supply in automotive and industrial power management systems.
Supply support for BC54PA-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 high-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified components and advanced packaging technologies.
The BC54PA-QX belongs to Nexperia's AEC-Q101-qualified medium-power bipolar transistor family, designed specifically for space-constrained, thermally demanding automotive power control and interface applications.
FAQ
What is the marking code for BC54PA-QX?
The BC54PA-QX is marked with "AT" on the top surface of the SOT1061 package, per Table 4 of the official Nexperia datasheet. This code identifies the specific hFE bin (63–250) and confirms AEC-Q101 qualification. No other alphanumeric variants apply to this part number.
Does BC54PA-QX support pulsed operation beyond 1 A?
Yes-BC54PA-QX supports 2 A peak collector current (ICM) for single pulses ≤1 ms, as specified in Table 5. This capability is validated under IEC 60134 absolute maximum ratings and enables use in intermittent load switching, such as solenoid actuation or LED strobing, without thermal runaway.
How does the SOT1061 package improve thermal performance over SOT23?
SOT1061 improves thermal performance via an exposed collector pad that lowers Rth(j-a) to 76 K/W (vs. ~200 K/W for standard SOT23), and its 2 mm × 2 mm footprint allows larger copper pour areas. The 0.65 mm height also enhances airflow and reduces thermal stacking in multi-layer assemblies.
Is BC54PA-QX pin-compatible with BC547 or BC548?
No-BC54PA-QX uses SOT1061 (3-pin leadless), while BC547/BC548 use TO-92 or SOT23 packages with different pinouts (E-B-C vs. E-C-B). Physical and electrical incompatibility means direct replacement requires PCB redesign, including footprint, thermal pad layout, and base drive network adjustment.
BC54PA-QX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- 3-PowerUDFN
- 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:
- 3-HUSON (2x2)
BC54PA-QX FAQ
1.How can I place an order for BC54PA-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BC54PA-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 BC54PA-QX reliable?
The price and inventory of BC54PA-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC54PA-QX is usually 5 days.
3.What payment methods are accepted for BC54PA-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC54PA-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC54PA-QX?
BC54PA-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC54PA-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 BC54PA-QX?
For technical support, including BC54PA-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC54PA-QX requirements.
6.How does Aetrix verify that BC54PA-QX is sourced from the original manufacturer or authorized distributors?
All BC54PA-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 BC54PA-QX meets industry standards.
7.What is the process for return or replacement of BC54PA-QX?
All BC54PA-QX units undergo pre-shipment inspection (PSI). If there is an issue with BC54PA-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 BC54PA-QX part is unused and in its original packaging.
Return procedure for BC54PA-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC54PA-QX Tags
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Diodes Incorporated
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BC847B,215
Nexperia USA Inc.
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