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Nexperia USA Inc. BSP51,115
- Part No.:
- BSP51,115
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
BSP51,115.pdf
- Description:
- TRANS NPN DARL 60V 1A SOT-223
- Quantity:
- Payment:
- Shipping:
Inventory:711
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Product details
Overview
BSP51 from Nexperia is an NPN Darlington transistor in SOT223 (SC-73) package, delivering 1 A continuous collector current, 60 V VCES, and DC current gain (hFE) ≥1000 at IC = 150 mA. It integrates base-emitter clamping diode and base resistor, enabling high-gain switching in industrial control and relay drivers.
For engineers reviewing the BSP51 datasheet, BSP51 pinout, BSP51 application, or BSP51 equivalent, key selection criteria include verified Darlington saturation voltage (VCE(sat) ≤ 1.3 V at IC = 500 mA), thermal resistance to solder point (Rth(j-sp) = 17 K/W), and non-automotive qualification status per revision v.4 (20250930).
Technical Context
The BSP51 implements a monolithic NPN Darlington pair with integrated base resistor and emitter-base clamp diode, eliminating external bias components. Its structure supports high DC gain amplification while maintaining low saturation voltage under moderate load currents up to 500 mA.
Designed for surface-mount industrial switching, it operates within −65 °C to 150 °C ambient range and requires FR4 PCB mounting with 1 cm² collector pad for rated 1.25 W power dissipation. Thermal performance is defined by Rth(j-a) = 96 K/W and Rth(j-sp) = 17 K/W under specified layout conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCES | 60 V - Maximum safe collector-emitter voltage with base shorted to emitter; defines upper limit for switching in 24–48 V industrial rails. |
| IC | 1 A - Continuous collector current rating; enables direct drive of small relays, solenoids, and LED arrays without heatsinking at <25 °C ambient. |
| hFE | ≥1000 @ VCE = 10 V, IC = 150 mA - High DC current gain reduces required base drive current, simplifying microcontroller GPIO interfacing. |
| VCE(sat) | ≤1.3 V @ IC = 500 mA, IB = 0.5 mA - Low saturation voltage minimizes conduction loss and self-heating during on-state operation. |
| Rth(j-sp) | 17 K/W - Junction-to-solder-point thermal resistance; enables accurate thermal modeling when mounted on standard FR4 with defined copper area. |
| fT | 200 MHz - Transition frequency; indicates usable bandwidth for low-speed switching (≤100 kHz) with margin for transient response. |
Pinout & Package
Package: SC-73 (SOT223), 4-lead surface-mount plastic package with extended heatsink tab (pin 4), 2.3 mm lead pitch, 6.5 mm × 3.5 mm × 1.65 mm body dimensions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Control input node; internally connected to base resistor and Darlington pair base; requires no external bias resistor. |
| 2 | Collector | Main current-carrying terminal; electrically tied to pin 4; serves as primary thermal path to PCB copper pour. |
| 3 | Emiter | Output reference node; common emitter configuration enables standard NPN switching topology with grounded load. |
| 4 | Collector | Second collector connection; identical to pin 2; provides redundant current path and enhanced thermal conduction to PCB. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated base resistor | Eliminates need for external base bias network; enables direct GPIO-level drive from 3.3 V or 5 V logic. |
| Emitter-base clamp diode | Prevents reverse-bias damage during inductive load turn-off; removes requirement for external flyback diode in basic relay drivers. |
| High hFE stability | hFE ≥2000 @ IC = 500 mA ensures robust gain across operating range, reducing sensitivity to temperature and process variation. |
| Low VCE(sat) at elevated Tj | VCE(sat) ≤1.3 V @ Tj = 150 °C maintains efficiency and thermal headroom in enclosed industrial enclosures. |
Applications
| Industrial Relay Driver | DC Motor On/Off Control |
|---|---|
|
Use Scenario: Driving 24 V DC coil relays in programmable logic controller (PLC) output modules. IC Role / Device Role / Timing Role: High-gain NPN Darlington switch providing galvanic isolation between microcontroller and inductive load. Use Value: Integrated base resistor and clamp diode reduce BOM count by two components; 1 A rating supports >10,000-cycle relay life without derating. |
Use Scenario: Enabling/disabling brushed 12–24 V DC motors in factory automation actuators. IC Role / Device Role / Timing Role: Single-stage power switch replacing discrete BJT + driver resistor + flyback diode. Use Value: VCE(sat) ≤1.3 V limits power loss to <0.65 W at 500 mA, avoiding active cooling in compact motor driver PCBs. |
| LED Array Power Switch | High-Gain Signal Amplifier |
|
Use Scenario: Switching multi-segment indicator LEDs or status lighting in HMI panels. IC Role / Device Role / Timing Role: Constant-current sink amplifier with fixed gain architecture for stable brightness control. Use Value: hFE ≥1000 allows full 1 A LED string drive with <1 mA base current, easing MCU GPIO sourcing requirements. |
Use Scenario: Amplifying low-level analog sensor signals (e.g., thermistor bridges) before ADC sampling. IC Role / Device Role / Timing Role: Linear-mode DC amplifier configured in emitter-follower or common-emitter topology. Use Value: Stable hFE over −40 °C to 125 °C ensures predictable gain drift <±5% across industrial temperature range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN Darlington transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor NSS12500UW3T1G | Lower VCES (45 V), higher fT (300 MHz), SOT-323 package (0.65 W Ptot). | Not suitable for 48 V rail switching; limited thermal capacity prevents 1 A continuous operation. | Select only for space-constrained, low-power (<300 mA), high-speed signal amplification. |
| Diodes Incorporated DXT691BK-13 | Same SOT223 package, 100 V VCES, but no integrated base resistor or clamp diode. | Requires external 10 kΩ base resistor and 1N4148 flyback diode; increases layout area and component count. | Choose when higher breakdown voltage is mandatory and design tolerates added passive components. |
Compared with NSS12500UW3T1G and DXT691BK-13, BSP51 uniquely combines 1 A current capability, integrated biasing/clamping, and SOT223 thermal performance-making it optimal for cost-sensitive, medium-power industrial switching where BOM reduction and thermal reliability are prioritized.
Availability
BSP51 is available at Aetrix Electronics and suitable for industrial relay drivers, DC motor on/off control, LED array switching, and high-gain signal amplification requiring stable component supply and long-term production continuity.
Supply support for BSP51 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 essential semiconductors for automotive, industrial, and consumer markets.
The BSP51 belongs to Nexperia's general-purpose bipolar transistor product line, engineered specifically for industrial-grade discrete switching and amplification where integration, thermal robustness, and qualification consistency are critical.
FAQ
Is BSP51 qualified for automotive applications?
No. Per revision v.4 (20250930), BSP51 is explicitly designated as non-automotive. It lacks AEC-Q101 qualification, automotive-specific testing, and guaranteed PPAP documentation. For automotive use, select Nexperia's BSP51-Q series or equivalent qualified alternatives.
What is the maximum allowable PCB copper area for thermal performance validation?
The datasheet specifies a 1 cm² single-sided copper pad for collector (pins 2 and 4) on FR4 board with tin plating. Using less than this area degrades Rth(j-a) beyond the rated 96 K/W and may cause premature thermal shutdown at >750 mA continuous load.
Can BSP51 replace a standard NPN transistor like BC817 in existing designs?
Only with circuit review. BSP51 has integrated base resistor (~10 kΩ typical), dual collector pins, and Darlington VBE(sat) ≈1.9 V-significantly higher than BC817's ~0.7 V. Direct substitution will cause incorrect biasing and potential failure unless base drive and load conditions are re-evaluated.
Does BSP51 require external flyback protection when driving inductive loads?
No external flyback diode is required for basic operation due to the integrated emitter-base clamp diode. However, for high-energy inductive loads (e.g., >100 mJ stored energy), an external TVS or RC snubber is recommended to suppress voltage overshoot exceeding 60 V VCES.
BSP51,115 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):
- 60 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
BSP51,115 FAQ
1.How can I place an order for BSP51,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for BSP51,115 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 BSP51,115 reliable?
The price and inventory of BSP51,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BSP51,115 is usually 5 days.
3.What payment methods are accepted for BSP51,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BSP51,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BSP51,115?
BSP51,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BSP51,115 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 BSP51,115?
For technical support, including BSP51,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BSP51,115 requirements.
6.How does Aetrix verify that BSP51,115 is sourced from the original manufacturer or authorized distributors?
All BSP51,115 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 BSP51,115 meets industry standards.
7.What is the process for return or replacement of BSP51,115?
All BSP51,115 units undergo pre-shipment inspection (PSI). If there is an issue with BSP51,115, 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 BSP51,115 part is unused and in its original packaging.
Return procedure for BSP51,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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