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Nexperia USA Inc. BCX51-10-QX
- Part No.:
- BCX51-10-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- TO-243AA
- Datasheet:
-
BCX51-10-QX.pdf
- Description:
- TRANS PNP 45V 1A SOT-89
- Quantity:
- Payment:
- Shipping:
Inventory:1,000
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Product details
Overview
BCX51-10-QX from Nexperia is a PNP medium-power bipolar junction transistor in SOT89 package, rated for −45 V VCEO, −1 A continuous collector current, and 160 hFE at −150 mA/−2 V, optimized for high-side switching and linear regulation in automotive-grade power management circuits.
For engineers reviewing the BCX51-10-QX datasheet, BCX51-10-QX pinout, BCX51-10-QX application, or BCX51-10-QX equivalent, this device is selected for its AEC-Q101 qualification, exposed heatsink thermal performance, and three-gain-bin availability-critical for stable biasing in battery-driven and MOSFET driver stages.
Technical Context
This PNP transistor operates with open-base VCEO = −45 V and supports peak pulsed collector current up to −2 A (tp ≤ 1 ms). Its DC current gain is binned at 63–160 (BCX51-10-Q), measured under VCE = −2 V, IC = −150 mA, Tamb = 25 °C.
Thermal design relies on SOT89's exposed collector pad: Rth(j-a) drops from 250 K/W (standard footprint) to 93 K/W (6 cm² copper pad), enabling 1.35 W total power dissipation at Tamb ≤ 25 °C when optimally mounted.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −45 V - Maximum safe collector-emitter voltage with base open; defines high-side switch blocking capability |
| IC | −1 A - Continuous DC collector current rating; sets steady-state load drive limit |
| hFE | 63–160 - Gain bin for BCX51-10-Q at −150 mA/−2 V; ensures predictable base drive sizing |
| Ptot | 1.35 W - Max power dissipation with 6 cm² copper pad; enables compact thermal layout in space-constrained PCBs |
| Rth(j-a) | 93 K/W - Junction-to-ambient thermal resistance with optimized pad; critical for junction temperature control below 150 °C |
| VCE(sat) | −0.5 V @ IC = −500 mA, IB = −50 mA - Low saturation voltage minimizes conduction loss in switching applications |
| fT | 145 MHz - Transition frequency at −5 V VCE, −50 mA IC; supports moderate-speed switching and amplification |
Pinout & Package
SOT89 (SC-62) surface-mount plastic package with 4.5 mm × 2.5 mm × 1.5 mm body, 1.5 mm lead pitch, and exposed collector pad for thermal and electrical conduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Emitter | Current exit node; connected to higher potential rail in PNP high-side configuration |
| 2 | Collector | Main current sink terminal; electrically and thermally tied to exposed pad for heat spreading |
| 3 | Base | Control input; requires negative bias relative to emitter to turn on; low-impedance drive needed for fast switching |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use per stress test standard; supports under-hood and safety-critical subsystems |
| Exposed collector pad | Enables direct thermal coupling to PCB copper; reduces Rth(j-a) by up to 63% vs. standard footprint |
| Three hFE bins | BCX51-10-Q (63–160), BCX51-16-Q (100–250), BCX51-Q (63–250); allows precise gain matching in production |
| High peak current | −2 A single-pulse rating (tp ≤ 1 ms); supports surge handling in motor drivers and power sequencing |
Applications
| Linear Voltage Regulators | High-Side Switches |
|---|---|
|
Use Scenario: Pass element in adjustable LDOs delivering 3.3 V/1 A from 12 V automotive battery. IC Role / Device Role / Timing Role: PNP pass transistor regulating output via emitter-follower configuration with feedback-controlled base bias. Use Value: −45 V VCEO provides 3× headroom over nominal 12 V rail; −0.5 V VCE(sat) limits dropout and thermal load at full load. |
Use Scenario: Load switch controlling 5 V/0.8 A infotainment module powered from vehicle ignition circuit. IC Role / Device Role / Timing Role: High-side PNP switch enabling/disabling power rail with logic-level base drive. Use Value: AEC-Q101 qualification ensures reliability across −40 °C to +125 °C ambient; exposed pad maintains Tj < 125 °C at full load. |
| Battery-Driven Devices | MOSFET Drivers |
|
Use Scenario: Power path controller in portable medical monitor using Li-ion battery (2.7–4.2 V). IC Role / Device Role / Timing Role: Reverse-polarity protection and load disconnect switch upstream of DC-DC converter. Use Value: −5 V VEBO rating prevents emitter-base breakdown during battery insertion transients; −1 A IC supports peak sensor burst loads. |
Use Scenario: Level-shifting stage driving N-channel high-side MOSFET gate in BLDC motor controller. IC Role / Device Role / Timing Role: PNP current source/sink providing fast gate charge/discharge with controlled edge rates. Use Value: 145 MHz fT ensures adequate bandwidth for 20 kHz PWM gate drive; 160 hFE bin enables predictable base current calculation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP medium-power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BCX51-16-Q | Higher hFE bin (100–250 vs. 63–160); identical VCEO, IC, package, and AEC-Q101 status | Better suited for low-base-drive designs where precise gain stability at light loads is required | Select when base drive current must be minimized without sacrificing switching speed or saturation margin |
| MMBT5401 | Lower VCEO (−60 V), same SOT23 package; not AEC-Q101 qualified; hFE 60–250 (unbinned) | Limited to non-automotive industrial or consumer applications due to qualification gap and smaller thermal pad | Choose only for cost-sensitive, non-automotive designs where −60 V rating suffices and thermal derating is acceptable |
Compared with BCX51-10-QX, BCX51-16-Q offers tighter gain control for precision biasing, while MMBT5401 trades automotive reliability and thermal performance for smaller size and lower cost in non-critical systems.
Availability
BCX51-10-QX is available at Aetrix Electronics and suitable for automotive power management, battery protection circuits, and industrial linear regulators requiring stable component supply with AEC-Q101 compliance and thermal robustness.
Supply support for BCX51-10-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 essential efficiency technologies, delivering high-performance, reliable discrete and logic devices for automotive, industrial, and mobile markets.
BCX51-Q series belongs to Nexperia's AEC-Q101-qualified medium-power transistor portfolio, engineered for high-reliability linear and switching functions in harsh-environment automotive power systems.
FAQ
What is the maximum allowable junction temperature for BCX51-10-QX?
The absolute maximum junction temperature (Tj) is 150 °C, as defined in the Absolute Maximum Ratings table. Operation above this value risks permanent degradation. Thermal design must ensure Tj remains within limits using the specified Rth(j-a) values and appropriate PCB copper area.
Is BCX51-10-QX suitable for switching 24 V industrial loads?
Yes-its −45 V VCEO rating provides 1.88× voltage margin over 24 V systems, and its −2 A pulsed current capability handles inductive kickback. However, thermal design must account for increased power dissipation at higher VCE during switching transitions.
How does the SOT89 exposed pad affect PCB layout?
The exposed collector pad must be soldered to a dedicated copper pour (minimum 1 cm² recommended, 6 cm² for full 1.35 W rating). The pad requires thermal vias to inner/ground planes and must avoid isolation gaps that impede heat flow-standard SOT89 reflow footprints from Nexperia's Fig. 10 apply.
Can BCX51-10-QX replace BCX51-16-Q in an existing design?
Yes, electrically and mechanically-it shares identical package, voltage/current ratings, and thermal specs. However, the lower hFE range (63–160 vs. 100–250) may require base resistor adjustment to maintain target IC and switching speed, especially at light loads.
BCX51-10-QX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- TO-243AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Transistor Type:
- PNP
- Current - Collector (Ic) (Max):
- 1 A
- Voltage - Collector Emitter Breakdown (Max):
- 45 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:
- 145MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-89
BCX51-10-QX FAQ
1.How can I place an order for BCX51-10-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BCX51-10-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 BCX51-10-QX reliable?
The price and inventory of BCX51-10-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BCX51-10-QX is usually 5 days.
3.What payment methods are accepted for BCX51-10-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BCX51-10-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BCX51-10-QX?
BCX51-10-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BCX51-10-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 BCX51-10-QX?
For technical support, including BCX51-10-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BCX51-10-QX requirements.
6.How does Aetrix verify that BCX51-10-QX is sourced from the original manufacturer or authorized distributors?
All BCX51-10-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 BCX51-10-QX meets industry standards.
7.What is the process for return or replacement of BCX51-10-QX?
All BCX51-10-QX units undergo pre-shipment inspection (PSI). If there is an issue with BCX51-10-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 BCX51-10-QX part is unused and in its original packaging.
Return procedure for BCX51-10-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BCX51-10-QX Tags
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