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Nexperia USA Inc. BSR41-QX
- Part No.:
- BSR41-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- TO-243AA
- Datasheet:
-
BSR41-QX.pdf
- Description:
- TRANS NPN 60V 1A SOT-89
- Quantity:
- Payment:
- Shipping:
Inventory:6,899
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Product details
Overview
BSR41-QX from Nexperia is an AEC-Q101-qualified NPN medium-power transistor in SOT89 package, rated for 60 V VCEO, 1 A continuous collector current, and 1.35 W power dissipation at Tamb ≤ 25 °C. It serves as a linear regulator pass element, low-side switch, or MOSFET driver in automotive power management systems.
For engineers reviewing the BSR41-QX datasheet, BSR41-QX pinout, BSR41-QX application, or BSR41-QX equivalent, key selection criteria include its 50–300 hFE range at 100 mA–500 mA, 250 ns turn-on time, 1 µs turn-off time, and thermal resistance of 13 K/W to solder point - critical for thermally constrained PCB layouts.
Technical Context
This discrete NPN bipolar junction transistor operates in active, saturation, and cutoff regions with verified DC current gain (hFE) from 50 to 300 across 100 µA–500 mA collector currents. Its 60 V VCEO and 70 V VCBO support robust operation in 12 V/24 V automotive supply rails with transient margin.
Thermal design is enabled by the exposed die pad in the SOT89 package, delivering Rth(j-sp) = 13 K/W to solder point and Rth(j-a) = 93 K/W in free air. Switching performance is characterized with 250 ns ton and 1 µs toff under defined pulsed conditions (tp ≤ 300 µs, δ ≤ 0.01).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 60 V - Maximum safe collector-emitter voltage with base open; defines rail tolerance for 24 V automotive systems. |
| IC | 1 A - Continuous DC collector current rating; supports medium-power switching and regulation loads. |
| hFE | 50–300 - DC current gain range at VCE = 5 V, IC = 100 mA to 500 mA; enables predictable base drive sizing. |
| VCE(sat) | ≤ 500 mV at IC = 500 mA, IB = 50 mA - Low saturation voltage minimizes conduction loss in switching applications. |
| Rth(j-sp) | 13 K/W - Junction-to-solder-point thermal resistance; enables direct thermal coupling to copper pour on FR4 PCB. |
| fT | 100 MHz - Transition frequency at VCE = 10 V, IC = 50 mA; confirms suitability for high-speed switching up to ~10 MHz. |
| toff | 1 µs - Turn-off time with IC = 100 mA, IBoff = −5 mA; constrains maximum PWM frequency in driver circuits. |
Pinout & Package
SOT89 (SC-62) plastic surface-mounted package with exposed collector pad for thermal conduction; dimensions 4.5 mm × 2.5 mm × 1.5 mm, 1.5 mm lead pitch, 6 cm² mounting pad recommended.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Emitter | Current exit path; connected to ground or low-side reference in switch configurations. |
| 2 | Collector | Main current input; electrically and thermally tied to exposed pad for heat sinking. |
| 3 | Base | Control terminal; requires current-limited drive (max IBM = 0.2 A pulse) to avoid damage. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Qualified for automotive use per Stress Test Qualification for Discrete Semiconductors - enables deployment without requalification. |
| Exposed collector pad | Integrated thermal path to PCB copper; achieves 13 K/W junction-to-solder-point resistance on standard FR4. |
| High hFE consistency | 50–300 hFE over 100 µA–500 mA range - reduces base drive circuit complexity and component count. |
| Low VCE(sat) | ≤ 500 mV at 500 mA - limits power loss to ≤ 250 mW in saturation, easing thermal design. |
Applications
| Linear Voltage Regulators | Low-Side Switches |
|---|---|
Use Scenario: Pass transistor in adjustable 5 V/3.3 V linear regulators for infotainment microcontrollers. IC Role / Device Role / Timing Role: NPN pass element controlling output voltage via base bias; operates in active region with feedback loop. Use Value: 60 V VCEO accommodates load-dump transients; 1.35 W Ptot supports ≥1 W dissipation at ambient ≤ 85 °C. |
Use Scenario: Controlling 12 V solenoid valves in engine control modules. IC Role / Device Role / Timing Role: Low-side switch sinking current to ground; driven by MCU GPIO with base resistor. Use Value: 1 µs toff enables 500 kHz PWM control; 2 A ICM handles inrush without derating. |
| Battery-Driven Devices | MOSFET Drivers |
Use Scenario: Power enable switch for 24 V battery-powered telematics units with reverse-polarity protection. IC Role / Device Role / Timing Role: High-side or low-side series switch managing main power rail entry. Use Value: 5 V VEBO ensures safe operation with Li-ion or lead-acid battery voltage ranges and ESD events. |
Use Scenario: Gate driver stage for N-channel power MOSFETs in DC-DC converter synchronous rectifiers. IC Role / Device Role / Timing Role: Current amplifier boosting MCU GPIO output to deliver ≥50 mA gate charge current. Use Value: 100–300 hFE provides stable current gain across temperature; 250 ns ton supports <100 ns dead-time control. |
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 |
|---|---|---|---|
| BSR31-Q | PNP complement; identical package, ratings, and AEC-Q101 qualification but opposite polarity. | Used where high-side sourcing or complementary push-pull stages are required. | Select when circuit topology demands PNP configuration - not a drop-in replacement. |
| ZTX653 | Higher VCEO = 100 V, lower hFE = 100–300, same SOT89 package; not AEC-Q101 qualified. | Suitable for industrial power supplies but lacks automotive qualification evidence. | Choose only for non-automotive designs requiring higher voltage headroom. |
Compared with BSR31-Q and ZTX653, the BSR41-QX uniquely combines AEC-Q101 compliance, 60 V/1 A rating, and optimized thermal resistance in SOT89 - making it the sole qualified choice for automotive low-side switching and linear regulation where qualification traceability is mandatory.
Availability
BSR41-QX is available at Aetrix Electronics and suitable for automotive power management, battery-driven devices, and MOSFET driver circuits requiring stable component supply and full AEC-Q101 documentation traceability.
Supply support for BSR41-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.
The BSR41-QX belongs to Nexperia's AEC-Q101-qualified general-purpose transistor product line, engineered specifically for automotive power control, linear regulation, and interface driver functions in harsh-environment ECUs.
FAQ
Is BSR41-QX pin-compatible with BSR31-Q?
No - BSR41-QX (NPN) and BSR31-Q (PNP) share the same SOT89 package and pinout order (E-C-B), but their polarity is opposite. Swapping them without circuit redesign will cause functional failure. Base drive polarity, current direction, and bias network must be inverted for PNP use.
What is the maximum allowable PCB copper area for optimal thermal performance?
Nexperia specifies a 6 cm² single-sided copper pad for the collector (Pin 2) on FR4 to achieve the rated 1.35 W power dissipation and 13 K/W Rth(j-sp). Reducing pad area below this increases thermal resistance nonlinearly - e.g., 2 cm² raises Rth(j-sp) to ~25 K/W, limiting usable current to ~600 mA at 85 °C ambient.
Does BSR41-QX support pulse-width modulation (PWM) at 100 kHz?
Yes - with ton = 250 ns and toff = 1 µs, total switching time is 1.25 µs, supporting PWM frequencies up to ~400 kHz before duty-cycle distortion occurs. At 100 kHz, switching losses remain below 5% of conduction loss when driving resistive loads ≤ 10 Ω.
Can BSR41-QX replace BC817 in automotive applications?
No - BC817 is not AEC-Q101 qualified, has lower VCEO (45 V), smaller SOT23 package (no exposed pad), and higher Rth(j-a) (~300 K/W). BSR41-QX provides automotive qualification, 60 V rating, and superior thermal performance - substitution requires full revalidation of thermal and reliability behavior.
BSR41-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:
- 100 @ 100mA, 5V
- Power - Max:
- 1.35 W
- Frequency - Transition:
- 100MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-89
BSR41-QX FAQ
1.How can I place an order for BSR41-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BSR41-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 BSR41-QX reliable?
The price and inventory of BSR41-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BSR41-QX is usually 5 days.
3.What payment methods are accepted for BSR41-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BSR41-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BSR41-QX?
BSR41-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BSR41-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 BSR41-QX?
For technical support, including BSR41-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BSR41-QX requirements.
6.How does Aetrix verify that BSR41-QX is sourced from the original manufacturer or authorized distributors?
All BSR41-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 BSR41-QX meets industry standards.
7.What is the process for return or replacement of BSR41-QX?
All BSR41-QX units undergo pre-shipment inspection (PSI). If there is an issue with BSR41-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 BSR41-QX part is unused and in its original packaging.
Return procedure for BSR41-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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