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

Nexperia USA Inc. BCP56-QX

Name: BCP56-QX
Brand: Nexperia USA Inc.
SKU: BCP56-QX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BCP56-QX

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

Package:: TO-261-4, TO-261AA

Datasheet:: BCP56-QX.pdf

Description:: TRANS NPN 80V 1A SOT-223

Quantity:: RFQ Add To RFQ list

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Inventory:4,855

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Product details

Overview

BCP56-Q from Nexperia is an AEC-Q101-qualified NPN medium power transistor in SOT223 (SC-73) package, rated for 80 V V_CEO, 1 A continuous collector current, and 1.35 W power dissipation with 6 cm² copper pad. It delivers h_FE of 63–250 at I_C = 150 mA and supports automotive linear voltage regulators and low-side switching.

For engineers reviewing the BCP56-Q datasheet, BCP56-Q pinout, BCP56-Q application, or BCP56-Q equivalent, this part is selected for stable high-current gain performance in thermally constrained automotive power stages where junction temperature must remain ≤150 °C under pulsed loads up to 2 A.

Technical Context

The BCP56-Q operates as a silicon NPN bipolar junction transistor optimized for medium-power linear and switching applications. Its structure supports DC current gain (h_FE) ranging from 63 to 250 across I_C = 5 mA–500 mA, with V_CE(sat) ≤ 500 mV at I_C = 500 mA / I_B = 50 mA and f_T = 100–180 MHz.

Thermal design relies on its SOT223 package's thermal resistance: R_th(j-a) = 93 K/W with 6 cm² copper pad, enabling sustained 1 A operation at ambient temperatures up to +125 °C when properly heatsinked. It meets AEC-Q101 stress test requirements for automotive use.

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 low-side switch or regulator designs.
I_C	1 A - Continuous DC collector current rating; supports load currents up to 1 A without forced cooling on standard FR4 PCB.
h_FE	63–250 - DC current gain range at V_CE = 2 V, I_C = 150 mA; enables predictable base drive sizing for switching or amplification.
P_tot	1.35 W - Max power dissipation with 6 cm² copper pad; sets thermal ceiling for linear operation in battery management or LDO pre-regulators.
f_T	100–180 MHz - Transition frequency at V_CE = 5 V, I_C = 50 mA; confirms suitability for audio-frequency amplification and fast-switching drivers.
V_CE(sat)	≤ 500 mV - Collector-emitter saturation voltage at I_C = 500 mA / I_B = 50 mA; ensures <0.25 W conduction loss in low-side switch configurations.

Pinout & Package

SOT223 (SC-73) surface-mount plastic package with integrated heatsink tab (pin 4), 4-terminal layout optimized for thermal transfer via large copper area on PCB.

Pin/Terminal	Circuit Role	Design Meaning
1	Base (B)	Control input node requiring ~50 mA base current to saturate at 500 mA collector load; connected to driver IC or microcontroller GPIO.
2	Collector (C)	Main current path input; electrically tied to pin 4; mounted directly to thermal pad for heat extraction in high-duty-cycle operation.
3	Emiter (E)	Reference/return node for load current; common connection point for emitter resistors in current-sensing or linear regulator feedback paths.
4	Collector (C)	Second collector terminal bonded to internal die heatsink; must be soldered to ≥6 cm² copper pour to achieve 1.35 W rating and 93 K/W R_th(j-a).

Key Features

Feature	Design Value
AEC-Q101 qualification	Validated for automotive underhood environments per stress test standard; eliminates need for additional qualification effort in Tier-1 designs.
Three h_FE variants	BCP56-Q (63–250), BCP56-10-Q (63–160), BCP56-16-Q (100–250); allows precise gain matching in production batches for consistent switching thresholds.
High P_tot with standard footprint	1.35 W dissipation using only SOT223 land pattern - avoids cost and complexity of TO-220 or DPAK while supporting >1 A loads.
Low V_CE(sat)	≤500 mV at rated I_C/I_B - reduces conduction loss by >40% vs. legacy medium-power transistors, improving efficiency in battery-powered MOSFET drivers.

Applications

Linear Voltage Regulators

MOSFET Drivers

Use Scenario: Pre-regulator stage in automotive infotainment power supply delivering 5 V/1 A from 12 V battery rail.

IC Role / Device Role / Timing Role: Pass transistor controlling output voltage via feedback loop; operates in linear mode with variable V_CE.

Use Value: 80 V V_CEO headroom accommodates load dump transients; 1.35 W P_tot enables full 1 A output without external heatsink.

Use Scenario: Gate driver for N-channel power MOSFET in BLDC motor control half-bridge.

IC Role / Device Role / Timing Role: Low-side switch pulling gate to ground; driven by MCU PWM with 50 ns rise/fall time capability.

Use Value: f_T ≥ 100 MHz ensures fast turn-on/turn-off; low V_CE(sat) minimizes driver-stage power loss during switching transitions.

Low-Side Switches

Battery-Driven Devices

Use Scenario: Load switch enabling/disabling 12 V accessory circuits (e.g., USB-C PD port, LED lighting) in EV cabin modules.

IC Role / Device Role / Timing Role: High-current saturated switch controlled by microcontroller GPIO; duty cycle up to 100%.

Use Value: I_CM = 2 A peak handles inrush current of capacitive loads; AEC-Q101 qualification guarantees reliability over 15-year vehicle life.

Use Scenario: Power path controller in portable medical monitor with Li-ion battery input and dual-rail analog/digital supplies.

IC Role / Device Role / Timing Role: Current-limited pass element in battery protection circuit; monitors load current via emitter resistor.

Use Value: Tight h_FE binning (63–250) enables accurate current sensing across temperature; T_j max = 150 °C supports sealed enclosure operation.

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
BCP56-16-Q	Higher h_FE min = 100 (vs. 63), same V_CEO/I_C/package	Better suited for low-base-drive applications like microcontroller-driven switches where I_B < 20 mA	Select when base drive current is limited and gain consistency at low I_C is critical.
ZTX653	TO-92 package, V_CEO = 60 V, I_C = 1 A, h_FE = 100–800, no AEC-Q101	Limited to non-automotive consumer/industrial use; lower thermal performance (R_th(j-a) ≈ 200 K/W)	Choose only for cost-sensitive, non-automotive prototypes where board space permits TO-92 and qualification is not required.

Compared with BCP56-16-Q, the BCP56-Q offers broader h_FE tolerance for flexible base drive design, while ZTX653 lacks automotive qualification and thermal capability - making BCP56-Q the optimal choice for production automotive power stages requiring AEC-Q101 compliance and SOT223 thermal efficiency.

Availability

BCP56-Q is available at Aetrix Electronics and suitable for automotive linear voltage regulators, MOSFET drivers, and low-side switches requiring stable component supply across extended temperature ranges and long lifecycle commitments.

Supply support for BCP56-Q 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 semiconductors, delivering high-performance, reliable components for automotive, industrial, and consumer markets.

The BCP56-Q belongs to Nexperia's AEC-Q101-qualified medium-power transistor family, engineered specifically for robust linear and switching functions in automotive power management and body electronics.

FAQ

What is the maximum allowable junction temperature for continuous operation?

The BCP56-Q has a maximum junction temperature (T_j) of 150 °C. This limit applies under all operating conditions, including continuous DC conduction and pulsed loads. To maintain T_j ≤ 150 °C at 1 A, the PCB must provide at least 6 cm² of copper for the collector pad, achieving R_th(j-a) = 93 K/W per datasheet condition [3].

Can BCP56-Q replace BCP56-10-Q in existing designs?

Yes - BCP56-Q and BCP56-10-Q share identical voltage, current, and thermal ratings, differing only in h_FE range (63–250 vs. 63–160). If the original design uses base resistors sized for minimum h_FE = 63, substitution is fully compatible; if optimized for higher gain, verify saturation margin at worst-case h_FE = 63.

Is the SOT223 thermal pad (pin 4) electrically isolated?

No - pin 4 is internally connected to the collector (same as pin 2). The thermal pad must be soldered to a collector-referenced copper pour. Using it as a floating heatsink or connecting it to ground will cause short-circuit failure. Layout must ensure collector net continuity between pins 2 and 4.

Does BCP56-Q support pulse operation beyond 1 A?

Yes - the device supports I_CM = 2 A for single pulses ≤1 ms (duty cycle ≤0.02). This capability is validated per IEC 60134 limiting values and enables inrush current handling in motor drivers and hot-swap circuits, provided thermal recovery time between pulses maintains average power within P_tot limits.

BCP56-QX Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: BCP56-Q

Package/Case:: TO-261-4, TO-261AA

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:: 650 mW

Frequency - Transition:: 180MHz

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-223

BCP56-QX FAQ

1.How can I place an order for BCP56-QX through Aetrix?

Please submit a Request for Quotation (RFQ) for BCP56-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 BCP56-QX reliable?

The price and inventory of BCP56-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BCP56-QX is usually 5 days.

3.What payment methods are accepted for BCP56-QX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BCP56-QX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BCP56-QX?

BCP56-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BCP56-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 BCP56-QX?

For technical support, including BCP56-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BCP56-QX requirements.

6.How does Aetrix verify that BCP56-QX is sourced from the original manufacturer or authorized distributors?

All BCP56-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 BCP56-QX meets industry standards.

7.What is the process for return or replacement of BCP56-QX?

All BCP56-QX units undergo pre-shipment inspection (PSI). If there is an issue with BCP56-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 BCP56-QX part is unused and in its original packaging.

Return procedure for BCP56-QX:

1.Submit a request within 90 days.

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

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