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Nexperia USA Inc. BCX56-QX
- Part No.:
- BCX56-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- TO-243AA
- Datasheet:
-
BCX56-QX.pdf
- Description:
- TRANS NPN 80V 1A SOT-89
- Quantity:
- Payment:
- Shipping:
Inventory:8,045
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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 VCEO, 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, this page delivers verified electrical parameters, thermal derating behavior, junction-to-ambient resistance values, and validated automotive-grade substitution options aligned with production design requirements.
Technical Context
This device operates as a silicon NPN bipolar junction transistor with DC current gain (hFE) ranging 63–250 at VCE = 2 V and IC = 150 mA, supporting linear and switching modes. Its 80 V VCEO rating enables use in 24 V and 48 V automotive subsystems where transient overvoltage immunity is required.
Thermal performance is defined by three mounting configurations: Rth(j-a) = 250 K/W (standard footprint), 132 K/W (1 cm² collector pad), and 93 K/W (6 cm² collector pad). The 150 °C maximum junction temperature and AEC-Q101 qualification confirm suitability for under-hood environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 80 V - supports operation in 24 V/48 V automotive power rails with margin against load-dump transients |
| IC | 1 A continuous - drives medium-power loads such as gate resistors of 100 V-class MOSFETs |
| Ptot | 1.35 W at Tamb ≤ 25 °C with 6 cm² copper pad - enables compact PCB layout without forced cooling |
| hFE | 63–250 - provides stable current amplification across IC = 5 mA to 500 mA for predictable base drive design |
| fT | 100–180 MHz - sufficient for high-speed switching in PWM-based power management circuits |
| Rth(j-a) | 93 K/W - achievable with 6 cm² copper area; defines minimum heatsinking requirement for 1 A DC operation |
| VCE(sat) | ≤ 0.5 V at IC = 500 mA, IB = 50 mA - limits conduction loss to < 250 mW in saturated low-side switch applications |
Pinout & Package
SOT89 (SC-62) surface-mount plastic package: 3-pin flat lead outline, 4.5 mm × 2.5 mm × 1.5 mm body, 1.5 mm lead pitch, with collector tab thermally and electrically connected to Pin 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Emitter | Reference node for current return path; connects to ground or low-side rail in switch configurations |
| 2 | Collector | Main power output terminal; electrically and thermally tied to exposed metal tab for heat transfer to PCB |
| 3 | Base | Control input requiring ~50 mA drive for full saturation at 500 mA collector current |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood use per stress test standard, including temperature cycling and HTRB |
| Three hFE variants | BCX56-Q (63–250), BCX56-10-Q (63–160), BCX56-16-Q (100–250) - enables precise gain matching in production batches |
| High Ptot capability | 1.35 W with optimized PCB copper - reduces need for external heatsinks in space-constrained modules |
| Low VCE(sat) | ≤ 0.5 V at IC/IB = 10 - minimizes power loss and self-heating during sustained conduction |
Applications
| Linear Voltage Regulators | MOSFET Drivers |
|---|---|
Use Scenario: Pass transistor in adjustable 3-terminal linear regulator supplying 12 V/500 mA to infotainment subsystems. IC Role / Device Role / Timing Role: NPN pass element controlling output voltage via base bias; handles full load current with minimal dropout. Use Value: 80 V VCEO withstands 12 V rail transients up to ±60 V; 1.35 W dissipation supports 12 V→5 V conversion at 500 mA without heatsink. | Use Scenario: Gate driver stage for high-side N-channel MOSFET in 48 V battery disconnect circuit. IC Role / Device Role / Timing Role: Low-side switch enabling fast turn-on of bootstrap capacitor charging path. Use Value: fT ≥ 100 MHz ensures < 50 ns switching transitions; VCE(sat) ≤ 0.5 V keeps driver-stage losses below 250 mW. |
| Low-Side Switches | Battery-Driven Devices |
Use Scenario: Load switch controlling 24 V solenoid actuator in ADAS camera module housing. IC Role / Device Role / Timing Role: Saturated NPN switch interfacing microcontroller GPIO to inductive load. Use Value: ICM = 2 A peak handles solenoid inrush; AEC-Q101 qualification ensures reliability across -40 °C to +125 °C ambient. | Use Scenario: Power enable switch for portable diagnostic tool powered by 18 V Li-ion pack. IC Role / Device Role / Timing Role: Reverse-polarity protection and ON/OFF control transistor in main power path. Use Value: VEBO = 5 V prevents base-emitter breakdown during hot-plug events; 150 °C Tj(max) accommodates sealed enclosure thermal buildup. |
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 |
|---|---|---|---|
| BCX56-16-Q | Higher hFE range (100–250) vs. BCX56-Q (63–250); identical VCEO, IC, package | Better suited for low-base-drive designs where microcontroller GPIO current is limited to < 10 mA | Select when base drive capability is constrained and higher gain stability at IC = 150 mA is required |
| ZTX653 | Same SOT89 package; VCEO = 100 V, IC = 1 A, hFE = 100–800, but not AEC-Q101 qualified | Lacks automotive qualification; suitable only for industrial or consumer applications with lower reliability demands | Choose only for non-automotive designs needing wider hFE spread and higher VCEO margin |
Compared with BCX56-16-Q, BCX56-Q offers broader hFE tolerance for cost-sensitive designs where base drive margin exists; versus ZTX653, it trades off gain range and voltage headroom for guaranteed automotive qualification and tighter thermal resistance specification.
Availability
BCX56-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 production 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 efficiency-enhancing components, delivering high-performance logic, discrete, and MOSFET devices for automotive, industrial, and mobile markets.
The BCX56-Q belongs to Nexperia's AEC-Q101-qualified medium-power bipolar transistor product line, engineered for robust switching and linear regulation in harsh automotive environments.
FAQ
What is the maximum allowable base current for continuous operation?
The absolute maximum DC base current (IB) is 0.3 A per limiting values table. However, for reliable continuous operation at IC = 1 A, base current should be limited to 100 mA to maintain safe junction temperature and avoid second breakdown. Derating is required above Tamb = 25 °C per Fig. 1 power derating curves.
Can BCX56-Q replace BCX56-10-Q in existing designs?
Yes - both share identical VCEO, IC, package, and thermal characteristics. The only difference is hFE range: BCX56-Q (63–250) vs. BCX56-10-Q (63–160). If the original design operates within the lower hFE bound and has sufficient base drive margin, substitution is functionally safe and requires no layout change.
Is the collector tab electrically isolated from other pins?
No - the collector (Pin 2) is directly connected to the exposed metal tab on the SOT89 package. This tab must be routed to the collector net on the PCB and may serve as the primary thermal path. Electrical isolation requires insulating thermal interface material if mounted to a grounded heatsink.
What is the typical transition frequency at 50 mA collector current?
The typical fT is 180 MHz at VCE = 5 V, IC = 50 mA, and f = 100 MHz, as specified in Table 7. This value remains stable across -55 °C to +125 °C ambient, making it suitable for high-speed gate driving in automotive power stages.
BCX56-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):
- 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-QX FAQ
1.How can I place an order for BCX56-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BCX56-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 BCX56-QX reliable?
The price and inventory of BCX56-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BCX56-QX is usually 5 days.
3.What payment methods are accepted for BCX56-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BCX56-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BCX56-QX?
BCX56-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BCX56-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 BCX56-QX?
For technical support, including BCX56-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BCX56-QX requirements.
6.How does Aetrix verify that BCX56-QX is sourced from the original manufacturer or authorized distributors?
All BCX56-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 BCX56-QX meets industry standards.
7.What is the process for return or replacement of BCX56-QX?
All BCX56-QX units undergo pre-shipment inspection (PSI). If there is an issue with BCX56-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 BCX56-QX part is unused and in its original packaging.
Return procedure for BCX56-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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