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

Nexperia USA Inc. BCX56-QF

Name: BCX56-QF
Brand: Nexperia USA Inc.
SKU: BCX56-QF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BCX56-QF

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

Package:: TO-243AA

Datasheet:: BCX56-QF.pdf

Description:: TRANS NPN 80V 1A SOT-89

Quantity:: RFQ Add To RFQ list

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Inventory:7,255

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Product details

Overview

BCX56-Q from Nexperia is an AEC-Q101-qualified NPN medium power transistor in SOT89 (SC-62) package, rated for 80 V V_CEO, 1 A continuous collector current, and 1.35 W power dissipation on 6 cm² copper pad - used as low-side switch in automotive linear voltage regulators and MOSFET drivers.

For engineers reviewing the BCX56-Q datasheet, BCX56-Q pinout, BCX56-Q application, or BCX56-Q equivalent, key selection criteria include its 80 V breakdown voltage, 63–250 h_FE gain range, AEC-Q101 qualification, thermal resistance of 93 K/W (with 6 cm² pad), and SOT89 surface-mount compatibility with standard reflow footprints.

Technical Context

This discrete NPN bipolar junction transistor operates in linear or switching mode with V_CEO = 80 V and I_C = 1 A DC rating. Its pulsed peak current reaches 2 A (t_p ≤ 1 ms), and it delivers h_FE = 63–250 at V_CE = 2 V, I_C = 150 mA under pulsed conditions.

Thermal performance is defined by three mounting configurations: R_th(j-a) = 250 K/W (standard footprint), 132 K/W (1 cm² collector pad), and 93 K/W (6 cm² collector pad). It features V_BE ≈ 1 V and V_CE(sat) ≤ 0.5 V at I_C = 500 mA / I_B = 50 mA.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	80 V - maximum safe collector-emitter voltage with base open; defines high-voltage capability in low-side switching.
I_C	1 A - continuous DC collector current rating; supports robust load driving in power management circuits.
h_FE	63–250 - DC current gain range at V_CE = 2 V, I_C = 150 mA; enables predictable base drive sizing.
P_tot	1.35 W - total power dissipation with 6 cm² copper pad; sets thermal design margin for sustained operation.
R_th(j-a)	93 K/W - junction-to-ambient thermal resistance with optimized 6 cm² collector pad; critical for thermal layout planning.
f_T	100–180 MHz - transition frequency at V_CE = 5 V, I_C = 50 mA; indicates usable bandwidth for moderate-speed switching.
V_CE(sat)	≤ 0.5 V - saturation voltage at I_C = 500 mA / I_B = 50 mA; determines conduction loss and heat generation in switch mode.

Pinout & Package

SOT89 (SC-62) plastic surface-mount package: 4.5 mm × 2.5 mm × 1.5 mm body, 1.5 mm lead pitch, flat leads for thermal enhancement via collector pad soldering.

Pin/Terminal	Circuit Role	Design Meaning
1	Emitter (E)	Current return path; connected to ground or low-side reference in switching applications.
2	Collector (C)	Main power output terminal; thermally coupled to PCB pad for heat dissipation.
3	Base (B)	Control input; requires ~50 mA drive for full saturation at 500 mA collector current.

Key Features

Feature	Design Value
AEC-Q101 qualification	Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JESD22 standards.
Three h_FE variants	BCX56-Q (63–250), BCX56-10-Q (63–160), BCX56-16-Q (100–250) - enables precise gain matching across production batches.
High thermal power handling	1.35 W P_tot with 6 cm² copper pad - supports higher ambient temperatures in engine bay or power supply modules.
Low V_CE(sat)	≤ 0.5 V at I_C/I_B = 10 - reduces conduction losses and improves efficiency in battery-driven low-side switches.
Standard SOT89 footprint	Compatible with IPC-7351B reflow land pattern (sot089_fr); enables drop-in replacement and automated assembly.

Applications

Linear Voltage Regulators

MOSFET Drivers

Use Scenario: Pass transistor in adjustable linear regulators powering infotainment or ADAS subsystems.

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

Use Value: 80 V V_CEO accommodates wide input ranges (e.g., 12 V–48 V automotive systems), while 1.35 W P_tot sustains thermal stability under load transients.

Use Scenario: Gate driver stage for N-channel power MOSFETs in motor control or DC-DC converters.

IC Role / Device Role / Timing Role: Low-side level-shifting switch enabling fast turn-on of high-side FETs via bootstrap circuitry.

Use Value: 180 MHz f_T and ≤ 0.5 V V_CE(sat) ensure rapid gate charging with minimal delay and conduction loss.

Low-Side Switches

Battery-Driven Devices

Use Scenario: Load switching in automotive body electronics (e.g., LED lighting, solenoid control).

IC Role / Device Role / Timing Role: High-current NPN switch sinking load current to ground under microcontroller GPIO control.

Use Value: 2 A I_CM peak rating handles inrush currents; AEC-Q101 qualification ensures long-term reliability in cyclic duty environments.

Use Scenario: Power path control in portable medical devices or industrial handheld tools with Li-ion batteries.

IC Role / Device Role / Timing Role: Battery disconnect or enable switch isolating downstream circuitry during sleep or fault conditions.

Use Value: 5 V V_EBO and low leakage (<100 nA IEBO) prevent unintended discharge; SOT89 compactness saves board space in space-constrained designs.

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
ZTX653	Higher V_CEO = 100 V, lower h_FE = 100–300, TO-92 package (not SMT)	Lacks AEC-Q101 qualification; unsuitable for automotive; requires through-hole assembly	Select only for non-automotive prototyping where higher voltage margin outweighs SMT and qualification needs.
BC817-40-Q	Lower V_CEO = 45 V, same SOT-23 package, AEC-Q101 qualified	Insufficient voltage headroom for 48 V systems; limited to 500 mA I_C	Use only in 12 V/24 V consumer or industrial applications where space constraints prohibit SOT89.

Compared with ZTX653 and BC817-40-Q, BCX56-Q uniquely combines 80 V rating, 1 A current, AEC-Q101 compliance, and SOT89 thermal performance - making it the only option qualified for automotive low-side switching above 45 V with surface-mount manufacturability.

Availability

BCX56-Q is available at Aetrix Electronics and suitable for automotive power management, industrial linear regulators, and battery-powered equipment requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for BCX56-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 BCX56-Q belongs to Nexperia's AEC-Q101-qualified discrete transistor portfolio, engineered specifically for robust, thermally efficient switching in automotive power systems and industrial control applications.

FAQ

What is the maximum allowable junction temperature for BCX56-Q?

The absolute maximum junction temperature (T_j) is 150 °C per IEC 60134 limiting values. Operation beyond this threshold risks permanent degradation. Derating curves in Figure 1 show that full 1.35 W power dissipation is only valid up to 25 °C ambient when using a 6 cm² collector pad; above that, power must be reduced linearly per the 93 K/W thermal resistance slope.

Is BCX56-Q pin-compatible with BCX56-10-Q or BCX56-16-Q?

Yes - all BCX56-Q series variants share identical SOT89 pinout (Emitter–Collector–Base on pins 1–2–3), mechanical dimensions, and thermal footprint. The only difference is DC current gain (h_FE) binning: BCX56-Q (63–250), BCX56-10-Q (63–160), and BCX56-16-Q (100–250), allowing direct substitution where gain tolerance permits.

Can BCX56-Q replace a BCX56 in non-automotive designs?

Yes - BCX56-Q is functionally identical to legacy BCX56 but adds AEC-Q101 qualification, tighter parametric screening, and enhanced process controls. It meets all electrical specifications of the standard BCX56 while offering superior reliability for mission-critical applications; no design changes are needed for drop-in use in existing layouts.

What PCB layout practices maximize thermal performance of BCX56-Q?

To achieve the 93 K/W R_th(j-a) rating, the collector pad (pin 2) must be connected to a minimum 6 cm² copper area on the top layer, using multiple thermal vias to inner/ground planes. Avoid narrow traces; follow Nexperia's sot089_fr reflow footprint (Fig. 11) with 2.25 mm × 4.75 mm solder lands and 1.2 mm solder mask openings for optimal thermal transfer and solder joint integrity.

BCX56-QF Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: TO-243AA

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:: 500 mW

Frequency - Transition:: 180MHz

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-89

BCX56-QF FAQ

1.How can I place an order for BCX56-QF through Aetrix?

Please submit a Request for Quotation (RFQ) for BCX56-QF 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 BCX56-QF reliable?

The price and inventory of BCX56-QF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BCX56-QF is usually 5 days.

3.What payment methods are accepted for BCX56-QF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BCX56-QF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BCX56-QF?

BCX56-QF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BCX56-QF 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 BCX56-QF?

For technical support, including BCX56-QF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BCX56-QF requirements.

6.How does Aetrix verify that BCX56-QF is sourced from the original manufacturer or authorized distributors?

All BCX56-QF 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 BCX56-QF meets industry standards.

7.What is the process for return or replacement of BCX56-QF?

All BCX56-QF units undergo pre-shipment inspection (PSI). If there is an issue with BCX56-QF, 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 BCX56-QF part is unused and in its original packaging.

Return procedure for BCX56-QF:

1.Submit a request within 90 days.

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

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