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Nexperia USA Inc. BC54PASX
- Part No.:
- BC54PASX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- 3-UDFN Exposed Pad
- Datasheet:
-
BC54PASX.pdf
- Description:
- TRANS NPN 45V 1A DFN2020D-3
- Quantity:
- Payment:
- Shipping:
Inventory:24,251
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Product details
Overview
BC54PAS from Nexperia is a 45 V, 1 A NPN medium power transistor in an ultra-thin DFN2020D-3 (SOT1061D) leadless SMD package, designed for linear voltage regulation, MOSFET driving, and high-side switching. It delivers hFE = 63–250 at VCE = 2 V, IC = 150 mA, supports 2 A peak collector current, and features side-wettable flanks for AOI-compatible solder joint inspection.
For engineers reviewing the BC54PAS datasheet, BC54PAS pinout, BC54PAS application, or BC54PAS equivalent, key selection criteria include its 45 V VCEO, 1 A continuous IC, thermal resistance as low as 76 K/W (4-layer PCB + 1 cm² collector pad), visible side pads for optical inspection, and dual hFE variants (BC54PAS, BC54-10PAS, BC54-16PAS) enabling gain-matched designs.
Technical Context
This NPN bipolar junction transistor operates with open-base VCEO = 45 V and VCBO = 45 V, supporting linear and switching applications up to 150 °C junction temperature. Its DFN2020D-3 package integrates an exposed collector pad for direct thermal conduction and electrical grounding, enabling efficient heat dissipation without discrete heatsinks.
The device exhibits pulsed fT = 100–180 MHz and VCE(sat) ≤ 500 mV at IC = 500 mA / IB = 50 mA, confirming suitability for fast-switching power control. Base-emitter voltage remains ≤ 1 V under rated conditions, ensuring predictable drive requirements in gate driver and regulator feedback paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 45 V - Maximum safe collector-emitter voltage with base open; defines upper rail limit in high-side switch or LDO pass transistor use. |
| IC (continuous) | 1 A - Continuous DC collector current; enables direct drive of small solenoids, LED strings, or logic-level MOSFET gates. |
| hFE | 63–250 - DC current gain range at VCE = 2 V, IC = 150 mA; determines required base drive current for saturation in switching designs. |
| Ptot (max) | 1.65 W - Total power dissipation on 4-layer FR4 with 1 cm² collector pad; sets thermal design margin for ambient temperatures up to 75 °C. |
| Rth(j-a) | 76 K/W - Junction-to-ambient thermal resistance under optimized PCB layout; enables accurate junction temperature estimation without thermal simulation. |
| fT | 100–180 MHz - Transition frequency at VCE = 5 V, IC = 50 mA; confirms usable bandwidth for audio amplification and PWM signal buffering. |
| Cc | 6 pF - Collector capacitance at VCB = 10 V; limits high-frequency Miller effect in switching nodes and affects rise/fall time in driver circuits. |
Pinout & Package
BC54PAS uses the DFN2020D-3 (SOT1061D) package: 2 mm × 2 mm × 0.65 mm body, leadless construction with side-wettable flanks for automated optical inspection and enhanced thermal/electrical performance via exposed collector pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base (B) | Control terminal; requires ~50 mA base current for full saturation at 500 mA collector load; connects to microcontroller GPIO or op-amp output. |
| 2 | Emitter (E) | Current return path; tied to ground or low-side reference; forms common node in emitter-follower configurations for voltage regulation. |
| 3 | Collector (C) | Power output terminal; electrically and thermally connected to exposed bottom pad; must be routed to copper pour for thermal management and low-inductance switching. |
Key Features
| Feature | Design Value |
|---|---|
| Exposed collector pad | Enables direct thermal coupling to PCB copper, reducing Rth(j-a) by up to 58% vs standard SOT-23 - critical for space-constrained power stages. |
| Side-wettable flanks | Allows 100% automated optical inspection (AOI) of solder joints without X-ray - eliminates manual visual checks in high-volume manufacturing. |
| Two hFE variants | BC54PAS (63–250) and BC54-10PAS (63–160) enable gain binning for consistent loop gain in feedback regulators or matched pairs in differential amplifiers. |
| Ultra-thin profile | 0.65 mm max height supports ultra-low-profile designs such as wearables and stacked PCB modules where Z-axis clearance is < 1 mm. |
Applications
| Linear Voltage Regulators | Battery-Driven Devices |
|---|---|
|
Use Scenario: Low-noise adjustable LDO using BC54PAS as pass transistor with op-amp error amplifier and Zener reference. IC Role / Device Role / Timing Role: NPN pass element controlling output voltage via emitter-follower configuration; handles up to 1 A load with minimal dropout. Use Value: Delivers stable 3.3 V/1 A output from 5–12 V input with < 20 mV line regulation and < 10 mV load regulation due to high hFE and low VCE(sat). |
Use Scenario: Power-path control in portable medical monitors, where battery voltage (7.4 V Li-ion) must be switched to subsystems only when active. IC Role / Device Role / Timing Role: High-side switch enabling/disabling power rails; driven by MCU GPIO through current-limiting resistor. Use Value: Achieves < 500 mV dropout at 800 mA load, minimizing battery drain during standby while supporting fast turn-on (< 1 µs) for responsive system wake-up. |
| MOSFET Drivers | Power Management |
|
Use Scenario: Level-shifting gate driver for N-channel MOSFET in buck converter top-side switch, interfacing 3.3 V MCU logic to 12 V gate drive. IC Role / Device Role / Timing Role: NPN transistor configured as grounded-emitter switch to pull gate low or allow pull-up to charge gate. Use Value: Supports >1 MHz switching with < 100 ns propagation delay and 6 pF Cc, reducing gate drive losses and improving converter efficiency by 1.2% at 500 kHz. |
Use Scenario: Load switch in industrial IoT sensor node, disconnecting non-critical peripherals (e.g., display, radio) during sleep mode to extend battery life. IC Role / Device Role / Timing Role: Medium-power discrete switch managing 500 mA load current; controlled by PMIC enable signal. Use Value: Reduces quiescent current to < 100 nA in off-state (ICBO ≤ 100 nA @ 25 °C), extending 2000 mAh battery runtime by 14 days in deep-sleep 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 |
|---|---|---|---|
| BC847BW | Smaller SOT-323 package (1.25 × 1.35 mm), lower IC = 100 mA, hFE = 110–800 - higher gain but lower power handling. | Not suitable for >200 mA loads; limited thermal capability (Rth(j-a) ≈ 300 K/W) restricts use in sustained linear regulation. | Select when board area is critical and load current stays below 100 mA; avoid in high-power switching or regulator pass roles. |
| ZTX653 | TO-92 package, higher VCEO = 60 V, IC = 1.5 A, but no side-wettable flanks or exposed pad - manual inspection required, poorer thermal performance. | Requires through-hole assembly and external heatsinking for >500 mA operation; incompatible with AOI and reflow-only processes. | Choose only for legacy through-hole designs or where 60 V rating is mandatory; not recommended for new SMT-based power management. |
Compared with BC847BW and ZTX653, BC54PAS uniquely balances 1 A current capability, 45 V rating, AOI-compatibility, and sub-1 mm profile - making it optimal for modern compact, high-reliability SMT power switches where thermal and inspection constraints dominate.
Availability
BC54PAS is available at Aetrix Electronics and suitable for linear voltage regulators, battery-driven devices, and MOSFET drivers requiring stable component supply, consistent hFE binning, and AOI-ready packaging.
Supply support for BC54PAS 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 delivering high-performance, reliable discrete, logic, and MOSFET devices with focus on efficiency, miniaturization, and manufacturability.
The BC54xPAS series targets space-constrained power control applications, combining medium power capability with ultra-thin DFN packaging and AOI support to accelerate high-volume SMT production.
FAQ
What is the maximum continuous collector current for BC54PAS under standard PCB conditions?
The BC54PAS supports 1 A continuous collector current when mounted on a standard FR4 PCB with single-sided copper and tin-plated footprint (per IEC 60134 limiting values). Derating applies above 25 °C ambient: power dissipation drops linearly to zero at 150 °C junction temperature, requiring thermal design review for sustained >75 °C environments.
Does BC54PAS require special soldering profiles due to its DFN2020D-3 package?
Yes - BC54PAS uses a DFN2020D-3 (SOT1061D) package with side-wettable flanks and an exposed collector pad. Reflow profiles must follow Nexperia's recommended ramp rates (≤ 3 °C/s), peak temperature (260 °C max), and time above 217 °C (60–150 s) to ensure void-free solder joints on both side pads and the thermal pad, as defined in Figure 12 of the datasheet.
How does the hFE variation across BC54PAS, BC54-10PAS, and BC54-16PAS affect circuit design?
BC54PAS (hFE = 63–250), BC54-10PAS (63–160), and BC54-16PAS (100–250) provide discrete gain bins. Designers select based on required base drive margin: BC54-10PAS suits low-gain-stability needs (e.g., simple on/off switches), while BC54-16PAS ensures robust saturation at high IC/IB ratios in precision current sources or linear regulators.
Can BC54PAS replace BC547B in existing designs?
No - BC54PAS is not a drop-in replacement for BC547B. It uses DFN2020D-3 (SOT1061D) packaging versus BC547B's TO-92, has different pinout (B-E-C vs E-B-C), and lacks leaded mechanical mounting. Electrical parameters also differ: BC54PAS offers higher IC (1 A vs 100 mA) and lower VCE(sat), but requires PCB redesign, footprint validation, and thermal layout verification.
BC54PASX 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-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DFN2020D-3
BC54PASX FAQ
1.How can I place an order for BC54PASX through Aetrix?
Please submit a Request for Quotation (RFQ) for BC54PASX 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 BC54PASX reliable?
The price and inventory of BC54PASX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC54PASX is usually 5 days.
3.What payment methods are accepted for BC54PASX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC54PASX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC54PASX?
BC54PASX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC54PASX 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 BC54PASX?
For technical support, including BC54PASX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC54PASX requirements.
6.How does Aetrix verify that BC54PASX is sourced from the original manufacturer or authorized distributors?
All BC54PASX 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 BC54PASX meets industry standards.
7.What is the process for return or replacement of BC54PASX?
All BC54PASX units undergo pre-shipment inspection (PSI). If there is an issue with BC54PASX, 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 BC54PASX part is unused and in its original packaging.
Return procedure for BC54PASX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC54PASX Tags
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Nexperia USA Inc.
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