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

Nexperia USA Inc. BCX55-QF

Name: BCX55-QF
Brand: Nexperia USA Inc.
SKU: BCX55-QF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BCX55-QF

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

Package:: TO-243AA

Datasheet:: BCX55-QF.pdf

Description:: TRANS NPN 60V 1A SOT-89

Quantity:: RFQ Add To RFQ list

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Inventory:7,447

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Product details

Overview

BCX55-Q from Nexperia is an AEC-Q101-qualified NPN medium power transistor in SOT89 (SC-62) package, rated for 60 V V_CEO, 1 A continuous collector current, and 1.35 W total power dissipation with 6 cm² copper pad. It delivers h_FE = 63–250 at I_C = 150 mA, V_CE = 2 V, and supports automotive-grade linear voltage regulators and low-side switching.

For engineers reviewing the BCX55-Q datasheet, BCX55-Q pinout, BCX55-Q application, or BCX55-Q equivalent, this device is selected for thermally demanding medium-power amplification and switching where exposed die-pad thermal performance, AEC-Q101 qualification, and three h_FE variants (Q, -10-Q, -16-Q) enable precise gain matching in production designs.

Technical Context

This NPN bipolar junction transistor operates as a linear amplifier or saturated switch with V_CEO = 60 V and I_C = 1 A, supporting DC and pulsed operation up to I_CM = 2 A (tp ≤ 1 ms). Its exposed collector pad enables direct thermal coupling to PCB copper, reducing R_th(j-sp) to 16 K/W.

It features guaranteed h_FE bins (63–250), V_BE ≤ 1 V at I_C = 500 mA, and V_CE(sat) ≤ 0.5 V at I_C/I_B = 10 - enabling predictable base drive design in MOSFET driver and regulator feedback stages.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	60 V - Maximum safe collector-emitter voltage with base open; defines maximum supply rail compatibility in linear regulators and switch-mode drivers.
I_C (continuous)	1 A - Continuous DC collector current rating; sets upper limit for sustained load switching or bias current in amplifier stages.
h_FE	63–250 - DC current gain range at V_CE = 2 V, I_C = 150 mA; enables precise gain selection across BCX55-Q variants for stable loop compensation.
P_tot	1.35 W - Max power dissipation with 6 cm² collector pad on FR4; determines minimum required PCB copper area for thermal compliance at full load.
R_th(j-sp)	16 K/W - Junction-to-solder-point thermal resistance; quantifies thermal path efficiency from die to PCB, critical for reliability in automotive under-hood environments.
f_T	100–180 MHz - Transition frequency at V_CE = 5 V, I_C = 50 mA; confirms suitability for high-speed switching and RF pre-driver applications up to ~50 MHz.

Pinout & Package

SOT89 (SC-62) surface-mount plastic package with exposed collector pad for enhanced thermal and electrical conduction; 3-pin flat-lead outline measuring 4.6 × 2.6 × 1.8 mm (L × W × H), compliant with JEITA SC-62 standard.

Pin/Terminal	Circuit Role	Design Meaning
1	Emitter (E)	Current return path; connected to ground or low-side reference; requires low-impedance trace routing for stability in feedback loops.
2	Collector (C)	Main power output terminal; electrically and thermally tied to exposed die pad; must be soldered to ≥1 cm² copper for rated P_tot.
3	Base (B)	Control input; driven with current-limited source (e.g., resistor from MCU GPIO); V_BE ≤ 1 V ensures predictable turn-on with 5 V logic.

Key Features

Feature	Design Value
AEC-Q101 qualification	Qualified per Automotive Electronics Council stress test standard - enables use in engine control, body electronics, and ADAS without additional qualification effort.
Exposed collector pad	Direct thermal interface to PCB copper reduces R_th(j-a) to 93 K/W (6 cm² pad), improving long-term reliability in ambient temperatures up to 150 °C.
Three h_FE bins	BCX55-Q (63–250), BCX55-10-Q (63–160), BCX55-16-Q (100–250) - allows gain-matched selection for consistent loop gain in multi-channel regulators or matched pair amplifiers.
High peak current capability	I_CM = 2 A (tp ≤ 1 ms) - supports surge handling in motor start-up, battery protection, and transient load switching without secondary protection circuitry.

Applications

Linear Voltage Regulators

Power Management

Use Scenario: Pass transistor in adjustable LDOs delivering 1–5 A output with <1 % line/load regulation.

IC Role / Device Role / Timing Role: Medium-power series pass element controlling output voltage via feedback loop; operates in linear region with continuous I_C up to 1 A.

Use Value: High h_FE and low V_CE(sat) minimize base drive loss and improve regulation accuracy; exposed pad maintains T_j < 125 °C at full load.

Use Scenario: Load switch or current limiter in 12 V/24 V automotive subsystems (e.g., infotainment power sequencing).

IC Role / Device Role / Timing Role: Low-side controlled switch enabling/disabling power rails; driven by microcontroller GPIO with simple RC base network.

Use Value: 60 V rating accommodates load dump transients; AEC-Q101 qualification ensures functional safety compliance without derating.

MOSFET Drivers

Battery-Driven Devices

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

IC Role / Device Role / Timing Role: Current-amplifying buffer between logic-level controller and MOSFET gate; delivers fast turn-on with I_B > 50 mA peak.

Use Value: f_T ≥ 100 MHz ensures sub-100 ns switching transitions; low V_CE(sat) reduces driver-stage conduction loss.

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

IC Role / Device Role / Timing Role: Battery isolation or reverse-polarity protection switch; biased in saturation for minimal forward drop during normal operation.

Use Value: V_CEO = 60 V supports 2S–4S battery stacks with margin; low I_CBO (<100 nA) minimizes standby leakage in always-on systems.

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
BCX54-Q	PNP complement; same V_CEO, I_C, package, and AEC-Q101 rating but opposite polarity.	Used in high-side switching or complementary push-pull output stages where PNP topology is required.	Select when designing symmetrical driver circuits or needing matched PNP/NPN pairs for rail-to-rail output swing.
ZTX653	Higher V_CEO = 100 V, lower h_FE = 100–300, TO-92 package; no AEC-Q101 qualification.	Suitable for industrial non-automotive power supplies where higher voltage margin is needed but automotive qualification is not required.	Choose only for non-automotive applications requiring >60 V breakdown; avoid where AEC-Q101 compliance or SMT assembly is mandatory.

Compared with BCX54-Q and ZTX653, BCX55-Q provides optimal balance of automotive qualification, SOT89 thermal performance, and gain binning - making it the preferred choice for space-constrained, thermally demanding automotive linear and switching functions where NPN polarity is specified.

Availability

BCX55-Q is available at Aetrix Electronics and suitable for linear voltage regulators, automotive power management modules, and MOSFET driver circuits requiring stable component supply with AEC-Q101 assurance and SMT manufacturability.

Supply support for BCX55-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 specializing in high-performance, reliable discrete and analog components, with leadership in automotive-qualified power transistors and ESD protection devices.

The BCX55-Q belongs to Nexperia's AEC-Q101-qualified medium-power transistor family, designed specifically for automotive linear regulation, load switching, and driver applications where thermal robustness and parametric consistency are critical.

FAQ

What is the maximum allowable junction temperature for BCX55-Q?

The absolute maximum junction temperature (T_j) is 150 °C per IEC 60134 limiting values. Operation above this threshold causes permanent degradation. Derating is required above Tamb = 25 °C - for example, at Tamb = 75 °C, maximum usable P_tot drops to ~0.95 W with 1 cm² collector pad, per Figure 1.

Can BCX55-Q replace BCX55-16-Q in a design?

Yes, but with gain trade-offs: BCX55-Q has h_FE = 63–250 while BCX55-16-Q guarantees 100–250. If the circuit relies on minimum h_FE ≥ 100 for stable biasing (e.g., in a current mirror), BCX55-Q may exhibit lower gain at low I_C, potentially affecting regulation accuracy or switching speed.

Is the exposed pad on BCX55-Q electrically connected to any internal node?

Yes - the exposed pad is internally connected to the collector terminal. It must be soldered to a PCB copper area designated as collector potential and sized per thermal requirements (1 cm² for 0.95 W, 6 cm² for 1.35 W). Floating or grounding the pad creates short-circuit risk and violates thermal specs.

Does BCX55-Q require external base current limiting in digital switching applications?

Yes - unlike MOSFETs, BCX55-Q is current-controlled. For reliable saturation at I_C = 500 mA, I_B ≥ 50 mA is required (I_C/I_B = 10). A series base resistor (e.g., 100 Ω from 5 V logic) is mandatory to prevent excessive base current and ensure V_CE(sat) ≤ 0.5 V.

BCX55-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):: 60 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

BCX55-QF FAQ

1.How can I place an order for BCX55-QF through Aetrix?

Please submit a Request for Quotation (RFQ) for BCX55-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 BCX55-QF reliable?

The price and inventory of BCX55-QF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BCX55-QF is usually 5 days.

3.What payment methods are accepted for BCX55-QF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BCX55-QF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BCX55-QF?

BCX55-QF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BCX55-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 BCX55-QF?

For technical support, including BCX55-QF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BCX55-QF requirements.

6.How does Aetrix verify that BCX55-QF is sourced from the original manufacturer or authorized distributors?

All BCX55-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 BCX55-QF meets industry standards.

7.What is the process for return or replacement of BCX55-QF?

All BCX55-QF units undergo pre-shipment inspection (PSI). If there is an issue with BCX55-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 BCX55-QF part is unused and in its original packaging.

Return procedure for BCX55-QF:

1.Submit a request within 90 days.

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

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