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Nexperia USA Inc. BCX55-10-QX
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- Part No.:
- BCX55-10-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- TO-243AA
- Datasheet:
-
BCX55-10-QX.pdf
- Description:
- TRANS NPN 60V 1A SOT-89
- Quantity:
- Payment:
- Shipping:
Inventory:1,000
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Product details
Overview
BCX55-10-QX from Nexperia is a 60 V, 1 A NPN medium power transistor in SOT89 (SC-62) package, optimized for linear voltage regulation and low-side switching with hFE = 63–160 at IC = 150 mA, VCE = 2 V, and qualified to AEC-Q101 for automotive use.
For engineers reviewing the BCX55-10-QX datasheet, BCX55-10-QX pinout, BCX55-10-QX application, or BCX55-10-QX equivalent, this device serves as a thermally robust, high-current-gain discrete switch or driver stage where precise DC current gain selection, exposed heatsink capability, and automotive-grade reliability are required.
Technical Context
This NPN bipolar junction transistor operates in active and saturation regions for analog amplification and switching functions. Its design supports continuous collector currents up to 1 A and peak pulses of 2 A, with VCEO = 60 V and VBE ≤ 1 V at IC = 500 mA, enabling stable operation in battery-driven and power management circuits.
Thermal performance is defined by Rth(j-sp) = 16 K/W to solder point and Ptot = 1.35 W with 6 cm² copper pad-critical for thermal management in compact SMT layouts. The exposed collector pad serves dual roles: electrical connection and thermal conduction path.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 60 V - Maximum safe collector-emitter voltage under open-base condition; defines upper rail limit in low-side switch designs. |
| IC | 1 A continuous - Sustained load current capacity; enables direct drive of relays, LEDs, or MOSFET gates without external buffering. |
| hFE | 63–160 at VCE = 2 V, IC = 150 mA - Tighter gain binning than BCX55-Q (63–250), improving predictability in current mirror or feedback loop applications. |
| VCE(sat) | ≤ 0.5 V at IC = 500 mA, IB = 50 mA - Low saturation voltage minimizes conduction loss and self-heating in switching mode. |
| fT | 100–180 MHz - Transition frequency confirms usable bandwidth for audio-frequency amplification and fast-switching gate driving. |
| Rth(j-sp) | 16 K/W - Junction-to-solder-point thermal resistance enables efficient heat transfer to PCB copper, critical for sustained 1 A operation. |
Pinout & Package
SOT89 (SC-62) surface-mount plastic package with exposed collector pad for enhanced thermal and electrical conductivity; 3-pin flat-lead configuration compatible with standard reflow and wave soldering footprints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Emitter | Current return path; connected to ground or low-side reference in common-emitter configurations. |
| 2 | Collector | Main current output terminal and thermal interface; electrically and thermally tied to exposed metal pad on underside of package. |
| 3 | Base | Control input; requires current-limited drive (max IB = 0.3 A) to ensure reliable saturation without overdrive stress. |
Key Features
| Feature | Design Value |
|---|---|
| Three hFE bins (Q/10-Q/16-Q) | Enables precise gain matching across production batches for current mirrors, differential pairs, and feedback networks. |
| Exposed collector pad | Provides dual-path functionality: low-impedance current path + 16 K/W thermal conduction to PCB, reducing junction temperature rise by >40 % vs. standard SOT23. |
| AEC-Q101 qualification | Validated for automotive underhood environments including temperature cycling (-55 °C to 150 °C), humidity, and mechanical shock per JESD22 standards. |
| High Ptot = 1.35 W | Supports continuous 1 A operation with adequate PCB copper area, eliminating need for discrete heatsinks in space-constrained modules. |
Applications
| Linear Voltage Regulators | Power Management |
|---|---|
Use Scenario: Pass transistor in adjustable LDOs delivering 500 mA–1 A output with <1 % line/load regulation. IC Role / Device Role / Timing Role: NPN pass element controlled by error amplifier; handles full load current while dissipating variable power based on input-output delta. Use Value: Low VCE(sat) and high hFE reduce dropout voltage and improve efficiency at full load, especially with 12 V automotive inputs. |
Use Scenario: Load switch or OR-ing diode replacement in dual-battery backup systems for industrial controllers. IC Role / Device Role / Timing Role: Discrete low-side switch controlling power domain enablement; driven by microcontroller GPIO with base resistor network. Use Value: 1 A continuous rating and AEC-Q101 qualification support fail-safe power sequencing in automotive body control modules. |
| Low-Side Switches | MOSFET Drivers |
Use Scenario: Driving solenoids, fans, or indicator LEDs in vehicle HVAC and lighting subsystems. IC Role / Device Role / Timing Role: High-current saturated switch interfacing between MCU logic and inductive/resistive loads. Use Value: Robust 2 A peak pulse rating accommodates inrush currents; exposed pad ensures thermal stability during repeated actuation cycles. |
Use Scenario: Level-shifting and current-boosting stage for driving N-channel MOSFET gates in motor control half-bridges. IC Role / Device Role / Timing Role: Active pull-down transistor in totem-pole gate driver configuration, complementing high-side driver IC. Use Value: fT ≥ 100 MHz and fast VBE response (<100 ns) enable clean 10–100 kHz PWM edge transitions with minimal shoot-through risk. |
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 |
|---|---|---|---|
| BCX55-16-Q | Higher hFE bin: 100–250 vs. 63–160; identical VCEO, IC, package, and thermal specs. | Better suited for low-base-drive applications (e.g., microcontroller GPIO directly driving base without buffer). | Select when minimizing base current is critical and gain variation must be constrained above 100. |
| ZTX653 | Same SOT89 package, but higher VCEO = 100 V and lower hFE = 50–200; not AEC-Q101 qualified. | Used in industrial power supplies requiring higher breakdown margin but no automotive compliance. | Choose only for non-automotive designs needing >60 V headroom and accepting wider gain spread and unqualified reliability. |
Compared with BCX55-10-QX, BCX55-16-Q offers tighter high-gain assurance for low-drive scenarios, while ZTX653 trades automotive qualification and gain consistency for higher voltage tolerance-making BCX55-10-QX optimal for cost-sensitive, thermally demanding automotive switches where predictable mid-range hFE is essential.
Availability
BCX55-10-QX is available at Aetrix Electronics and suitable for linear voltage regulators, low-side switches, MOSFET drivers, and battery-driven devices requiring stable component supply across automotive, industrial, and embedded power designs.
Supply support for BCX55-10-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 discrete and logic devices, with leadership in automotive-qualified components and advanced packaging technologies.
The BCX55-Q series belongs to Nexperia's AEC-Q101-qualified medium-power transistor product line, engineered specifically for thermally demanding automotive power management and switching applications where SOT89 footprint and exposed-pad thermal performance are critical.
FAQ
What is the maximum allowable base current for BCX55-10-QX?
The absolute maximum base current is 0.3 A continuous, with peak pulses up to 0.3 A for ≤1 ms. Exceeding this risks metallization failure or bond wire damage. For reliable saturation at IC = 1 A, design base drive for IB ≥ 10 mA using hFE(min) = 63, verified by VCE(sat) ≤ 0.5 V in actual layout.
Is BCX55-10-QX suitable for switching inductive loads like relays or solenoids?
Yes-its 2 A peak collector current rating and 60 V VCEO safely handle typical relay coil energy and flyback transients. Use a reverse-biased freewheeling diode across the load, and verify that PCB copper area provides ≥1.35 W dissipation capability during sustained activation.
How does the exposed collector pad affect PCB layout and thermal design?
The exposed pad must be connected to a minimum 6 cm² copper pour on the top layer, thermally vias to inner/ground planes, and solder mask opening per Nexperia's SOT89 footprint (Fig. 10). This achieves Rth(j-a) = 93 K/W and enables full 1.35 W power dissipation without derating below 70 °C ambient.
What distinguishes BCX55-10-QX from BCX55-Q in practical circuit design?
BCX55-10-QX guarantees hFE ≥ 63 and ≤ 160 at IC = 150 mA, whereas BCX55-Q spans 63–250. This narrower gain range improves predictability in current-source biasing and feedback loops, reducing design margin requirements and simplifying worst-case analysis for production yield.
BCX55-10-QX 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
BCX55-10-QX FAQ
1.How can I place an order for BCX55-10-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BCX55-10-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 BCX55-10-QX reliable?
The price and inventory of BCX55-10-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BCX55-10-QX is usually 5 days.
3.What payment methods are accepted for BCX55-10-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BCX55-10-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BCX55-10-QX?
BCX55-10-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BCX55-10-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 BCX55-10-QX?
For technical support, including BCX55-10-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BCX55-10-QX requirements.
6.How does Aetrix verify that BCX55-10-QX is sourced from the original manufacturer or authorized distributors?
All BCX55-10-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 BCX55-10-QX meets industry standards.
7.What is the process for return or replacement of BCX55-10-QX?
All BCX55-10-QX units undergo pre-shipment inspection (PSI). If there is an issue with BCX55-10-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 BCX55-10-QX part is unused and in its original packaging.
Return procedure for BCX55-10-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BCX55-10-QX Tags
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