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Nexperia USA Inc. BSP50-QX
- Part No.:
- BSP50-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
BSP50-QX.pdf
- Description:
- TRANS NPN DARL 45V 1A SOT-223
- Quantity:
- Payment:
- Shipping:
Inventory:3,011
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Product details
Overview
BSP50-QX from Nexperia is an AEC-Q101-qualified NPN Darlington transistor in SOT223 (SC-73) package, delivering 1 A continuous collector current, 45 V VCES, and DC current gain (hFE) ≥1000 at 150 mA - used as a high-gain switching or amplification device in automotive body control modules and industrial relay drivers.
For engineers reviewing the BSP50-QX datasheet, BSP50-QX pinout, BSP50-QX application, or BSP50-QX equivalent, this page provides verified electrical parameters, thermal resistance values (Rth(j-sp) = 17 K/W), switching timing (ton = 500 ns, toff = 1300 ns), and automotive qualification context to support reliability-driven design decisions.
Technical Context
The BSP50-QX implements a monolithic NPN Darlington pair with integrated base-emitter resistor and clamp diode, enabling simplified drive circuitry and reduced external component count. Its structure supports high DC gain at low base drive currents while maintaining stable saturation voltage under thermal stress.
Qualified per AEC-Q101, it operates across −65 °C to +150 °C junction temperature range and delivers 1.25 W total power dissipation on FR4 PCB with 1 cm² collector pad. Thermal resistance from junction to solder point is 17 K/W - critical for thermally constrained automotive PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCES | 45 V - maximum safe collector-emitter voltage with base shorted to emitter; defines upper rail limit in switching applications |
| IC | 1 A continuous - rated collector current for sustained operation without derating at Tamb ≤ 25 °C |
| hFE | ≥1000 at VCE = 10 V, IC = 150 mA - enables low-base-current drive for efficient interface with microcontrollers or logic gates |
| VCE(sat) | ≤1.3 V at IC = 500 mA, IB = 0.5 mA, Tj = 150 °C - ensures minimal conduction loss and heat generation in high-temp environments |
| Rth(j-sp) | 17 K/W - thermal resistance from junction to solder point; enables accurate thermal modeling when mounted on standard FR4 with exposed collector pad |
| toff | 1300 ns - turn-off delay under defined test conditions; constrains maximum switching frequency in PWM-controlled loads |
Pinout & Package
Package: SC-73 (SOT223) - surface-mount plastic package with 4 leads, 2.3 mm pitch, 6.5 mm × 3.5 mm × 1.65 mm body, and integrated heatsink tab (lead 2 and 4 are both collectors, electrically common).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base (B) | Control input terminal; internally connected to first transistor's base and second transistor's base via integrated resistor |
| 2 | Collector (C) | Main current-carrying output terminal; electrically tied to pin 4; serves as thermal path to PCB copper |
| 3 | Emitter (E) | Common emitter node for both transistors; referenced ground point for load return path |
| 4 | Collector (C) | Second collector terminal, internally bonded to pin 2; provides redundant connection for mechanical robustness and thermal spreading |
Key Features
| Feature | Design Value |
|---|---|
| Integrated base resistor and clamp diode | Reduces external component count by eliminating discrete biasing and flyback protection in relay/inductive load circuits |
| AEC-Q101 qualification | Validated for automotive use including temperature cycling, humidity testing, and ESD robustness - suitable for under-hood and body electronics |
| Dual collector terminals (pins 2 & 4) | Improves current handling and thermal dissipation by doubling conductor cross-section and enhancing solder joint reliability |
| High hFE ≥ 2000 at 500 mA | Enables direct drive from 3.3 V or 5 V logic outputs without additional pre-driver stages in medium-power switching |
Applications
| Automotive Door Lock Actuator | Industrial PLC Output Stage |
|---|---|
|
Use Scenario: Driving 12 V solenoid-based door lock mechanisms in vehicle body control units. IC Role / Device Role / Timing Role: High-gain Darlington switch providing >500 mA load current with <1 mA MCU GPIO drive. Use Value: Eliminates need for external driver IC or MOSFET gate driver; reduces BOM cost and board space while meeting AEC-Q101 reliability requirements. |
Use Scenario: Switching 24 V DC inductive loads (e.g., contactor coils) in programmable logic controller output modules. IC Role / Device Role / Timing Role: Medium-power discrete output stage interfacing field-programmable logic to industrial actuators. Use Value: Delivers 1 A continuous current with <1.3 V saturation drop, minimizing self-heating during extended duty cycles in enclosed cabinets. |
| LED Signage Power Booster | Heating Element Controller |
|
Use Scenario: Amplifying PWM signals to drive high-brightness LED arrays requiring >800 mA per channel. IC Role / Device Role / Timing Role: Current-boosting stage between microcontroller PWM output and LED string cathode. Use Value: Maintains linear dimming response up to 20 kHz due to predictable ton/toff behavior and avoids audible noise in LED drivers. |
Use Scenario: Controlling resistive heating elements (e.g., HVAC cabin heaters) in automotive climate systems. IC Role / Device Role / Timing Role: Robust on/off switch operating at elevated ambient temperatures near engine bays. Use Value: Supports 150 °C junction temperature and 17 K/W Rth(j-sp), enabling reliable operation without forced cooling in thermally dense assemblies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN Darlington switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor NSS12500UW3T1G | Lower VCES (40 V), lower hFE (min 500), no integrated diode, SOT-323 package | Not qualified to AEC-Q101; limited to consumer-grade portable equipment | Select only for space-constrained non-automotive designs where thermal performance is secondary |
| Diodes Incorporated DXT75000QE-13 | Higher VCES (60 V), same SOT223 package, AEC-Q101 qualified, but hFE min = 500 at 500 mA | Supports higher bus voltages but requires higher base drive current for equivalent gain | Prefer when system voltage exceeds 45 V or when tighter thermal margin is needed via identical footprint |
Compared with NSS12500UW3T1G and DXT75000QE-13, the BSP50-QX uniquely balances AEC-Q101 compliance, high hFE ≥1000 at low IC, and dual-collector thermal design - making it optimal for automotive and industrial applications demanding both reliability and drive efficiency.
Availability
BSP50-QX is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC output stages, and LED signage power boosting requiring stable component supply and long-term lifecycle assurance.
Supply support for BSP50-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 BSP50-QX belongs to Nexperia's AEC-Q101-qualified Darlington transistor family, engineered specifically for robust, low-component-count switching in automotive body electronics and industrial control systems.
FAQ
Is BSP50-QX pin-compatible with BSP60?
No - BSP50-QX is an NPN Darlington; BSP60 is its PNP complement. They share the same SOT223 package and pinout (base-collector-emitter-collector), but polarity reversal means they cannot substitute directly in circuit. Designers must invert biasing and load placement when swapping between them.
What is the maximum allowable base current for continuous operation?
The absolute maximum limiting base current is 100 mA per datasheet Table 5. However, typical operation uses ≤0.5 mA to drive 500 mA collector current due to hFE ≥2000. Exceeding 100 mA risks permanent damage even at room temperature.
Does BSP50-QX include a built-in flyback diode?
Yes - the device integrates a base-emitter clamp diode, confirmed in Section 2 ("Features and benefits") and functional block diagrams in Nexperia's official documentation. This protects against negative base-emitter voltage transients during inductive load switching.
Can BSP50-QX be used in linear amplifier configurations?
It is not recommended - the BSP50-QX is optimized for saturated switching, not linear operation. Its high hFE variation with IC and temperature, plus lack of specified linearity parameters (e.g., THD, fT stability), makes it unsuitable for analog amplification despite DC gain capability.
BSP50-QX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- TO-261-4, TO-261AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Transistor Type:
- NPN - Darlington
- Current - Collector (Ic) (Max):
- 1 A
- Voltage - Collector Emitter Breakdown (Max):
- 45 V
- Vce Saturation (Max) @ Ib, Ic:
- 1.3V @ 500µA, 500mA
- Current - Collector Cutoff (Max):
- 50nA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 2000 @ 500mA, 10V
- Power - Max:
- 1.25 W
- Frequency - Transition:
- 200MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223
BSP50-QX FAQ
1.How can I place an order for BSP50-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BSP50-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 BSP50-QX reliable?
The price and inventory of BSP50-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BSP50-QX is usually 5 days.
3.What payment methods are accepted for BSP50-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BSP50-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BSP50-QX?
BSP50-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BSP50-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 BSP50-QX?
For technical support, including BSP50-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BSP50-QX requirements.
6.How does Aetrix verify that BSP50-QX is sourced from the original manufacturer or authorized distributors?
All BSP50-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 BSP50-QX meets industry standards.
7.What is the process for return or replacement of BSP50-QX?
All BSP50-QX units undergo pre-shipment inspection (PSI). If there is an issue with BSP50-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 BSP50-QX part is unused and in its original packaging.
Return procedure for BSP50-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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