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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

Nexperia USA Inc. BC56PAS-QX

Name: BC56PAS-QX
Brand: Nexperia USA Inc.
SKU: BC56PAS-QX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BC56PAS-QX

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

Package:: 3-UDFN Exposed Pad

Datasheet:: BC56PAS-QX.pdf

Description:: TRANS NPN 80V 1A DFN2020D-3

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Product details

Overview

BC56PAS-QX from Nexperia is an AEC-Q101-qualified NPN medium power transistor in a DFN2020D-3 (SOT1061D) leadless package, rated for 80 V V_CEO, 1 A continuous I_C, and 2 A peak I_CM. It delivers h_FE of 63–250 at V_CE = 2 V, I_C = 150 mA, and supports automotive-grade linear voltage regulation and MOSFET driver stages with low V_CE(sat) ≤ 500 mV.

For engineers reviewing the BC56PAS-QX datasheet, BC56PAS-QX pinout, BC56PAS-QX application, or BC56PAS-QX equivalent, this page provides verified package dimensions, thermal resistance values (R_th(j-a) down to 76 K/W), current gain variants, AOI-compatible side-wettable flanks, and AEC-Q101 qualification status - all critical for high-reliability automotive PCB layout and thermal design.

Technical Context

This transistor operates as a medium-power NPN switch or linear amplifier with base-controlled current gain, optimized for DC and pulsed switching up to 1 ms. Its DFN2020D-3 package integrates exposed collector pad for direct thermal conduction and side-wettable flanks enabling automated optical inspection of solder joints.

It features three distinct h_FE bins (BC56PAS-Q: 63–250; BC56-10PAS-Q: 63–160; BC56-16PAS-Q: 100–250), defined under pulsed conditions (t_p ≤ 300 µs, duty ≤ 0.02), and supports operation from −55 °C to +150 °C ambient with junction temperature limited to 150 °C.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	80 V - Maximum safe collector-emitter voltage with base open; defines upper rail limit in high-side switch or regulator topologies.
I_C	1 A continuous - Sustained DC collector current capability; determines maximum load drive in battery-powered drivers.
h_FE	63–250 - Confirmed DC current gain range at V_CE = 2 V, I_C = 150 mA, 25 °C; enables predictable base drive sizing.
V_CE(sat)	≤ 500 mV at I_C = 500 mA, I_B = 50 mA - Low saturation voltage minimizes conduction loss in switching applications.
R_th(j-a)	76 K/W - Minimum thermal resistance when mounted on 4-layer FR4 with 1 cm² collector pad; informs heatsinking requirements.
f_T	100–180 MHz - Transition frequency at V_CE = 5 V, I_C = 50 mA, 100 MHz; confirms suitability for moderate-speed switching.
P_tot	1.65 W - Total power dissipation on 4-layer FR4 with 1 cm² collector pad; sets practical power envelope for board-level thermal design.

Pinout & Package

BC56PAS-QX uses the DFN2020D-3 (SOT1061D) ultra-thin 2 mm × 2 mm × 0.65 mm leadless package with exposed collector pad and side-wettable flanks for AOI compatibility and enhanced thermal transfer.

Pin/Terminal	Circuit Role	Design Meaning
1	Base (B)	Control input terminal; requires current-limited drive (max I_B = 0.3 A) to avoid damage during switching transients.
2	Emitter (E)	Reference node for biasing; connected to ground or low-side return path in common-emitter configurations.
3	Collector (C)	Power output terminal; electrically and thermally tied to exposed bottom pad; must be routed to thermal copper area per footprint spec.

Key Features

Feature	Design Value
AEC-Q101 qualification	Validated for automotive use per Stress Test Qualification for Discrete Semiconductors - enables deployment in engine control, body electronics, and ADAS subsystems.
Side-wettable flanks	Enables Automated Optical Inspection (AOI) of solder joint integrity on both top and side surfaces - reduces post-reflow defect escape in high-volume manufacturing.
Exposed collector pad	Provides direct thermal path from die to PCB copper - achieves R_th(j-sp) = 20 K/W and supports >1 W continuous dissipation on standard FR4.
Multiple h_FE bins	Three factory-sorted gain options (63–250, 63–160, 100–250) allow precise base resistor selection without design margin overkill.
Ultra-thin profile	0.65 mm max height enables stacking in space-constrained modules such as ECU daughterboards and compact LED drivers.

Applications

Linear Voltage Regulators

Battery-Driven Devices

Use Scenario: Pass transistor in adjustable LDO or series regulator supplying 3.3 V/1 A to microcontroller rails in automotive infotainment head units.

IC Role / Device Role / Timing Role: NPN pass element operating in linear mode, dissipating up to 1.2 W at 12 V input/3.3 V output.

Use Value: Low V_CE(sat) and stable h_FE ensure tight output regulation across temperature; AEC-Q101 rating guarantees reliability over vehicle lifetime.

Use Scenario: Load switch controlling power to GPS module in portable telematics tracker powered by 3.7 V Li-ion cell.

IC Role / Device Role / Timing Role: High-side switch enabling/disabling 500 mA load with <10 µs turn-on via MCU GPIO.

Use Value: 2 A peak I_CM handles inrush; side-wettable flanks ensure solder joint reliability after repeated thermal cycling in mobile environments.

MOSFET Drivers

High-Side Switches

Use Scenario: Gate driver stage for 40 V N-channel MOSFET in 12 V automotive motor control H-bridge.

IC Role / Device Role / Timing Role: NPN emitter-follower providing fast, low-impedance gate pull-down and controlled Miller clamping.

Use Value: f_T ≥ 100 MHz ensures <50 ns switching transitions; exposed collector pad manages 0.8 W dissipation during PWM dead-time.

Use Scenario: High-side switch for 24 V solenoid actuator in commercial vehicle braking system.

IC Role / Device Role / Timing Role: Saturated NPN switch sourcing up to 1 A load current with base driven by isolated PWM controller.

Use Value: 80 V V_CEO withstands load dump transients; R_th(j-a) ≤ 114 K/W allows operation at 105 °C ambient without derating.

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
BC817-40Q	Same DFN2020D-3 package, but lower V_CEO = 45 V and h_FE = 250–600; no AEC-Q101 certification.	Not suitable for 80 V systems or automotive qualified designs; acceptable only in non-safety-critical 24 V industrial controls.	Select only if voltage stress is <45 V and automotive qualification is unnecessary.
ZTX951	TO-92 package, V_CEO = 100 V, I_C = 1 A, but no side-wettable flanks or AEC-Q101 rating; R_th(j-a) ≈ 200 K/W.	Larger footprint and inferior thermal performance limits use in compact, high-power-density automotive modules.	Choose only when through-hole assembly is required or thermal budget permits higher junction temperature rise.

Compared with BC817-40Q and ZTX951, BC56PAS-QX uniquely combines 80 V rating, AEC-Q101 compliance, ultra-thin DFN packaging with AOI support, and sub-100 K/W thermal resistance - making it the only option qualified for space- and reliability-constrained automotive linear and switching functions.

Availability

BC56PAS-QX is available at Aetrix Electronics and suitable for automotive body control modules, battery management systems, and embedded power management requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for BC56PAS-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 efficiency technologies, delivering high-performance logic, discrete, and MOSFET devices for automotive, industrial, and consumer markets.

BC56PAS-QX belongs to the BC56xPAS-Q series of AEC-Q101-qualified medium-power transistors designed specifically for automotive power management, linear regulation, and robust switching in harsh-environment ECUs.

FAQ

What is the marking code for BC56PAS-QX?

The BC56PAS-QX is marked with "CK" on the top surface of the DFN2020D-3 package, as specified in Table 4 of the official Nexperia datasheet dated 28 May 2024. This 2-character laser mark is located within the transparent top view area and aligns with the standardized pin 1 indicator position.

Can BC56PAS-QX replace BC547 in automotive designs?

No - BC547 is a legacy TO-92 transistor with no AEC-Q101 qualification, 45 V V_CEO, and no thermal pad or side-wettable flanks. BC56PAS-QX offers higher voltage rating, automotive qualification, superior thermal performance, and surface-mount compatibility, making it a functional upgrade - not a drop-in replacement - requiring PCB layout and thermal design revision.

What is the maximum allowable base current for continuous operation?

The absolute maximum base current for BC56PAS-QX is 0.3 A, as stated in Table 5 (Limiting Values). Exceeding this value risks permanent degradation of h_FE and bond wire integrity. For reliable 1 A collector current, typical base drive is 50 mA (I_C/I_B = 20), well within safe continuous limits.

Does BC56PAS-QX require special reflow profile considerations?

Yes - due to its DFN2020D-3 package with side-wettable flanks, BC56PAS-QX requires adherence to the reflow footprint and profile in Figure 12 of the datasheet. Peak temperature must not exceed 260 °C, and the thermal mass of the exposed collector pad demands controlled ramp rates to prevent solder voiding or tombstoning.

BC56PAS-QX Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: BC56PAS-Q

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):: 80 V

Vce Saturation (Max) @ Ib, Ic:: 500mV @ 50mA, 500mA

Current - Collector Cutoff (Max):: 100nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 40 @ 500mA, 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

BC56PAS-QX FAQ

1.How can I place an order for BC56PAS-QX through Aetrix?

Please submit a Request for Quotation (RFQ) for BC56PAS-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 BC56PAS-QX reliable?

The price and inventory of BC56PAS-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC56PAS-QX is usually 5 days.

3.What payment methods are accepted for BC56PAS-QX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC56PAS-QX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC56PAS-QX?

BC56PAS-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC56PAS-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 BC56PAS-QX?

For technical support, including BC56PAS-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC56PAS-QX requirements.

6.How does Aetrix verify that BC56PAS-QX is sourced from the original manufacturer or authorized distributors?

All BC56PAS-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 BC56PAS-QX meets industry standards.

7.What is the process for return or replacement of BC56PAS-QX?

All BC56PAS-QX units undergo pre-shipment inspection (PSI). If there is an issue with BC56PAS-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 BC56PAS-QX part is unused and in its original packaging.

Return procedure for BC56PAS-QX:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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