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

Nexperia USA Inc. BC56-10PA-QX

Name: BC56-10PA-QX
Brand: Nexperia USA Inc.
SKU: BC56-10PA-QX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BC56-10PA-QX

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

Package:: 3-PowerUDFN

Datasheet:: BC56-10PA-QX.pdf

Description:: TRANS NPN 80V 1A 3HUSON

Quantity:: RFQ Add To RFQ list

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Inventory:3,000

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Product details

Overview

BC56-10PA-QX from Nexperia is an AEC-Q101-qualified NPN medium power transistor in a thermally enhanced DFN2020-3 (SOT1061) package, rated for 80 V V_CEO, 1 A continuous collector current, and 2 A peak pulse current. It delivers h_FE = 63–160 at V_CE = 2 V and I_C = 150 mA, with exposed heatsink for low thermal resistance-designed for automotive-grade low-side switching and MOSFET driver stages.

For engineers reviewing the BC56-10PA-QX datasheet, BC56-10PA-QX pinout, BC56-10PA-QX application, or BC56-10PA-QX equivalent, this part supports high-reliability linear voltage regulation, battery-driven device power management, and thermally constrained PCB layouts where junction-to-ambient thermal resistance as low as 76 K/W (4-layer PCB + 1 cm² collector pad) is critical.

Technical Context

This NPN transistor operates with V_CEO = 80 V and V_CBO = 100 V, enabling use in 48 V automotive subsystems and industrial power rails up to 60 V DC. Its f_T = 100–180 MHz and C_c = 6 pF support stable switching at frequencies up to several tens of MHz in driver and amplifier configurations.

The device features pulsed base current capability up to 0.3 A and saturation voltage V_CE(sat) ≤ 500 mV at I_C = 500 mA / I_B = 50 mA, ensuring efficient conduction in low-duty-cycle power control circuits. Thermal performance is defined across five mounting conditions, with R_th(j-a) ranging from 76 K/W to 298 K/W depending on PCB copper layer count and collector pad area.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	80 V - Maximum safe collector-emitter voltage with open base; enables use in 48 V automotive systems and industrial 60 V rails.
I_C	1 A continuous - Sustained DC collector current rating; supports medium-power load switching without forced cooling.
h_FE	63–160 at V_CE = 2 V, I_C = 150 mA - Current gain range optimized for predictable base drive sizing in linear regulators and drivers.
V_CE(sat)	≤ 500 mV at I_C = 500 mA / I_B = 50 mA - Low saturation voltage minimizes conduction loss and self-heating in switching applications.
R_th(j-a)	76 K/W (4-layer PCB, 1 cm² collector pad) - Enables operation up to 1.65 W total power dissipation at T_amb = 25 °C.
f_T	100–180 MHz - Transition frequency supports high-speed switching in gate driver and RF amplifier roles up to ~50 MHz.
AEC-Q101	Qualified - Meets stress test requirements for automotive discrete semiconductors; suitable for under-hood and body-control modules.

Pinout & Package

BC56-10PA-QX uses the SOT1061 (DFN2020-3) leadless surface-mount package: 2.0 mm × 2.0 mm × 0.65 mm body with exposed thermal pad on underside, optimized for solder-reflow assembly and thermal transfer to PCB copper.

Pin/Terminal	Circuit Role	Design Meaning
1	Base (B)	Control terminal; accepts DC or pulsed base current up to 0.3 A peak for reliable turn-on of 1 A collector load.
2	Emitter (E)	Reference node for biasing; connected to ground or low-side return path; forms current mirror reference in amplifier designs.
3	Collector (C)	Power output terminal; electrically and thermally connected to exposed pad; must be routed to ≥1 cm² copper for rated P_tot.

Key Features

Feature	Design Value
Thermally enhanced DFN package	Exposed collector pad reduces R_th(j-a) to 76 K/W on 4-layer PCB - enables higher power density than standard SOT-23 equivalents.
AEC-Q101 qualification	Validated for automotive temperature range (−55 °C to +150 °C) and mechanical stress - eliminates requalification for Tier 1 supply chains.
Three h_FE variants	BC56-10PA-QX (63–160), BC56-16PA-QX (100–250), BC56PA-QX (63–250) - allows precise gain binning for consistent loop stability in feedback circuits.
Low V_CE(sat)	≤ 500 mV at I_C/I_B = 10 - reduces power loss by >30% vs. legacy 2N2222A in 500 mA switching applications.
High f_T and low C_c	180 MHz f_T, 6 pF collector capacitance - supports clean edge rates and minimal phase lag in high-frequency driver stages.

Applications

Linear Voltage Regulators

MOSFET Drivers

Use Scenario: Pass transistor in adjustable LDOs delivering 1–3 A at 3.3 V/5 V/12 V from 12–48 V input rails in automotive ECUs.

IC Role / Device Role / Timing Role: NPN pass element controlling output voltage via emitter-follower configuration with external error amplifier.

Use Value: V_CEO = 80 V headroom accommodates load-dump transients; low V_CE(sat) maintains efficiency above 90% at full load.

Use Scenario: Totem-pole stage driving high-capacitance gates of N-channel power MOSFETs in BLDC motor inverters and DC-DC controllers.

IC Role / Device Role / Timing Role: Low-side switch providing fast turn-on current surge (I_B up to 50 mA) to charge gate capacitance rapidly.

Use Value: f_T = 180 MHz ensures <100 ns rise/fall times; exposed pad sustains 1 A pulsed I_C during gate charging without thermal throttling.

Low-Side Switches

Battery-Driven Devices

Use Scenario: Load switch for 12 V/24 V solenoids, relays, and LED arrays in commercial vehicle lighting and HVAC actuators.

IC Role / Device Role / Timing Role: Medium-power NPN switch controlled by microcontroller GPIO, with base resistor network for current limiting.

Use Value: I_CM = 2 A handles inrush currents of inductive loads; AEC-Q101 qualification ensures reliability over 15-year vehicle lifetime.

Use Scenario: Power-path control in portable medical monitors, handheld test equipment, and ruggedized IoT sensors operating from Li-ion or 2S packs.

IC Role / Device Role / Timing Role: Enable/disable switch for subsystem power domains, configured in common-emitter with logic-level base drive.

Use Value: Compact 2.0 × 2.0 mm footprint saves board space; R_th(j-a) = 114 K/W on single-layer PCB supports fanless operation at ambient up to 70 °C.

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 h_FE = 250–600; lower V_CEO = 45 V; no AEC-Q101 certification.	Not qualified for automotive; limited to 36 V systems; higher gain may cause instability in feedback loops without compensation.	Select when cost-sensitive non-automotive designs require higher h_FE and lower voltage ratings suffice.
MMBT4401-TP	SOT-23 package (3.0 × 1.4 × 1.0 mm); V_CEO = 40 V; I_C = 600 mA; R_th(j-a) ≈ 250 K/W on FR4 - significantly less thermal capability.	Unsuitable for 48 V systems or >0.6 A continuous loads; requires larger board area per watt due to inferior thermal performance.	Choose only for legacy SOT-23 footprints or low-power consumer applications where size constraints override thermal needs.

Compared with BC817-40-Q and MMBT4401-TP, BC56-10PA-QX uniquely combines AEC-Q101 qualification, 80 V breakdown, 1 A continuous rating, and 76 K/W thermal resistance - making it the only option among the three viable for thermally demanding automotive 48 V power switches and linear regulators.

Availability

BC56-10PA-QX is available at Aetrix Electronics and suitable for automotive electronic control units, industrial power management modules, and battery-powered medical instrumentation requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for BC56-10PA-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 essential semiconductors - including logic, discretes, MOSFETs, and ESD protection devices - serving automotive, industrial, and consumer markets.

The BC56PA-Q series belongs to Nexperia's AEC-Q101-qualified discrete transistor portfolio, engineered specifically for automotive power management, signal conditioning, and robust switching in harsh environments.

FAQ

What is the maximum allowable junction temperature for BC56-10PA-QX?

The absolute maximum junction temperature (T_j) is 150 °C per the datasheet Limiting Values table. Operation above this threshold risks permanent degradation of h_FE and increased leakage. Derating curves in Figure 1 show that at 100 °C ambient, maximum continuous power drops to ~0.8 W on standard FR4 - design must ensure thermal path limits T_j within spec under worst-case load and ambient conditions.

Does BC56-10PA-QX support pulsed operation beyond its 1 A DC rating?

Yes - the datasheet specifies I_CM = 2 A for single pulses ≤1 ms, enabling short-duration surge handling in motor startup, relay coil energization, and inrush current limiting. Pulse duty cycle must remain ≤0.02 (2%) to avoid thermal accumulation; transient impedance curves (Figures 2–6) confirm safe energy dissipation under these conditions.

How does the exposed thermal pad on SOT1061 affect PCB layout?

The exposed collector pad must be soldered to a dedicated copper pour - minimum 1 cm² for rated 1.65 W dissipation on 4-layer boards. The footprint in Figure 12 defines solder mask openings and paste stencil apertures; insufficient pad area or poor thermal via placement increases R_th(j-a) by >100 K/W, risking thermal runaway at full load.

Is BC56-10PA-QX pin-compatible with BC547 or 2N2222?

No - BC56-10PA-QX uses a 3-pin DFN2020-3 (SOT1061) leadless package with bottom-side thermal pad, while BC547 and 2N2222 use through-hole TO-92 or SMD SOT-23 packages with different pinouts (E-B-C vs. E-C-B) and no thermal pad. Direct replacement requires PCB redesign and thermal validation.

BC56-10PA-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):: 80 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)

BC56-10PA-QX FAQ

1.How can I place an order for BC56-10PA-QX through Aetrix?

Please submit a Request for Quotation (RFQ) for BC56-10PA-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 BC56-10PA-QX reliable?

The price and inventory of BC56-10PA-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC56-10PA-QX is usually 5 days.

3.What payment methods are accepted for BC56-10PA-QX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC56-10PA-QX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC56-10PA-QX?

BC56-10PA-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC56-10PA-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 BC56-10PA-QX?

For technical support, including BC56-10PA-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC56-10PA-QX requirements.

6.How does Aetrix verify that BC56-10PA-QX is sourced from the original manufacturer or authorized distributors?

All BC56-10PA-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 BC56-10PA-QX meets industry standards.

7.What is the process for return or replacement of BC56-10PA-QX?

All BC56-10PA-QX units undergo pre-shipment inspection (PSI). If there is an issue with BC56-10PA-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 BC56-10PA-QX part is unused and in its original packaging.

Return procedure for BC56-10PA-QX:

1.Submit a request within 90 days.

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

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