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Nexperia USA Inc. BSR43-QX
- Part No.:
- BSR43-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- TO-243AA
- Datasheet:
-
BSR43-QX.pdf
- Description:
- TRANS NPN 80V 1A SOT-89
- Quantity:
- Payment:
- Shipping:
Inventory:2,312
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Product details
Overview
BSR43-QX from Nexperia is an NPN general-purpose bipolar junction transistor in SOT89 (SC-62) package, rated for 80 V VCEO, 1 A continuous collector current, and qualified to AEC-Q101 for automotive use; employed as low-side switch and MOSFET driver in linear voltage regulators and battery-powered power management circuits.
For engineers reviewing the BSR43-QX datasheet, BSR43-QX pinout, BSR43-QX application, or BSR43-QX equivalent, key selection criteria include DC current gain (hFE = 100–300 at IC = 100 mA), VCE(sat) ≤ 500 mV at IC = 500 mA/IB = 50 mA, thermal resistance Rth(j-sp) = 13 K/W, and AEC-Q101 qualification status.
Technical Context
The BSR43-QX operates as a medium-power NPN switching and amplification device with base-controlled current amplification. Its design supports stable DC biasing and pulsed switching up to 1 µs turn-off time, with guaranteed hFE ≥ 50 at IC = 500 mA and VCE = 5 V under pulsed conditions (tp ≤ 300 µs, duty ≤ 0.01).
Thermal performance is defined for FR4 PCB mounting with 6 cm² collector pad, delivering Rth(j-a) = 93 K/W in free air and Rth(j-sp) = 13 K/W to solder point. Absolute maximum ratings include VCBO = 90 V, VEBO = 5 V, and Tj = 150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 80 V - Maximum collector-emitter voltage with base open; defines safe blocking capability in low-side switch configurations. |
| IC | 1 A - Continuous DC collector current rating; supports load switching in battery-driven devices up to 1 A steady-state. |
| hFE | 100–300 - DC current gain at VCE = 5 V, IC = 100 mA; enables precise base drive sizing for saturation control. |
| VCE(sat) | ≤ 500 mV - Collector-emitter saturation voltage at IC = 500 mA / IB = 50 mA; ensures < 0.25 W conduction loss at full rated current. |
| Rth(j-sp) | 13 K/W - Junction-to-solder-point thermal resistance; allows direct thermal coupling to PCB copper for reliable 1.35 W power dissipation. |
| fT | 100 MHz - Transition frequency at VCE = 10 V, IC = 50 mA; supports high-speed switching in MOSFET gate driving applications. |
Pinout & Package
SOT89 (SC-62) plastic surface-mount package: 3-lead, 1.5 mm pitch, 4.5 mm × 2.5 mm × 1.5 mm body; collector tab forms exposed thermal pad on lead 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Emitter | Current return path; connected to ground or low-impedance reference in low-side switch topologies. |
| 2 | Collector | Main power output terminal; electrically and thermally coupled to PCB copper via exposed pad for heat dissipation. |
| 3 | Base | Control input; requires current-limited drive (IB ≤ 50 mA peak) to achieve full saturation at IC = 500 mA. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Stress-tested per automotive discrete semiconductor standard; validated for under-hood and chassis-mounted applications. |
| 1.35 W Ptot at Tamb ≤ 25 °C | Enables operation without heatsink in compact power management modules with adequate PCB copper area. |
| Low VCE(sat) (≤ 500 mV) | Reduces conduction losses in battery-powered systems where efficiency directly impacts runtime. |
| Fast switching (toff ≤ 1 µs) | Supports PWM frequencies up to ~100 kHz in MOSFET driver stages without significant delay penalties. |
| High hFE consistency (100–300) | Permits simplified base drive circuitry with reduced component count in linear regulator error amplifier stages. |
Applications
| Linear Voltage Regulators | Low-Side Switches |
|---|---|
|
Use Scenario: Pass transistor in adjustable LDO or emitter-follower regulator designs requiring <1 A output current. IC Role / Device Role / Timing Role: NPN pass element controlling output voltage via base bias; operates in active/linear region for regulation. Use Value: High hFE minimizes base drive current burden on error amplifier; low VCE(sat) reduces dropout voltage and improves efficiency at full load. |
Use Scenario: Ground-referenced load switch in automotive body control modules or portable instrumentation. IC Role / Device Role / Timing Role: NPN switch sinking current from resistive or inductive loads (e.g., solenoids, LEDs) to ground. Use Value: AEC-Q101 qualification ensures reliability in vibration-prone environments; 2 A peak ICM handles inrush currents safely. |
| Battery-Driven Devices | MOSFET Drivers |
|
Use Scenario: Power enable/control stage in handheld medical monitors or industrial data loggers powered by Li-ion cells. IC Role / Device Role / Timing Role: High-side or low-side power rail switch enabling/disabling subsystems to conserve battery energy. Use Value: Low standby leakage (ICBO ≤ 100 nA at 25 °C) extends shelf life; thermal robustness maintains performance across −40 °C to +125 °C ambient. |
Use Scenario: Gate driver for N-channel power MOSFETs in DC-DC converter half-bridge or synchronous rectifier stages. IC Role / Device Role / Timing Role: Current amplifier stage translating logic-level signals into high-current gate charge/discharge pulses. Use Value: 100 MHz fT and 1 µs toff support fast gate transitions; low Cc (12 pF) minimizes Miller effect during switching. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN general-purpose transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BSR43 | Non-automotive grade; lacks AEC-Q101 qualification; identical electrical specs and SOT89 package. | Not suitable for automotive production; acceptable for industrial or consumer prototypes where qualification is not required. | Select BSR43 only if AEC-Q101 compliance is unnecessary and cost sensitivity outweighs long-term reliability requirements. |
| MMBT4401 | Lower VCEO (40 V), lower IC (600 mA), TO-236 (SOT-23) package; no AEC-Q101 rating. | Limited to low-voltage (<40 V) battery systems; unsuitable for 12 V/24 V automotive rails or 80 V transient-tolerant designs. | Choose MMBT4401 only for space-constrained, non-automotive applications below 40 V and 600 mA. |
Compared with BSR43-QX, BSR43 omits automotive qualification but matches all electrical and thermal specs, while MMBT4401 trades voltage/current headroom and package thermal performance for smaller footprint-making BSR43-QX the sole option meeting AEC-Q101, 80 V, and 1 A requirements in SOT89.
Availability
BSR43-QX is available at Aetrix Electronics and suitable for linear voltage regulators, low-side switches, and MOSFET drivers requiring stable component supply in automotive, industrial, and battery-powered embedded systems.
Supply support for BSR43-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 semiconductors, delivering high-performance, reliable components for automotive, industrial, and consumer markets.
The BSR43-QX belongs to Nexperia's AEC-Q101-qualified general-purpose transistor product line, engineered for robust switching and amplification in harsh-environment power control applications.
FAQ
Is BSR43-QX pin-compatible with BSR33-Q?
No, BSR43-QX (NPN) and BSR33-Q (PNP) are complementary devices with identical SOT89 package and pinout (E-C-B), but opposite polarity. They share mechanical compatibility for layout symmetry in push-pull or H-bridge driver designs, but cannot be substituted electrically without circuit redesign.
What is the maximum allowable base current for continuous operation?
The absolute maximum peak base current is 0.2 A for single pulses ≤1 ms, but continuous base current must be limited to ensure IC ≤ 1 A and Tj ≤ 150 °C. At IC = 500 mA and hFE = 100, typical IB = 5 mA; sustained IB > 50 mA risks thermal overload without forced cooling.
Does BSR43-QX support operation at −55 °C?
Yes, BSR43-QX is specified from −65 °C to +150 °C for storage and −55 °C to +150 °C for operation. Electrical characteristics including hFE and VBE(sat) are characterized down to −55 °C, confirming suitability for extended-temperature automotive and industrial deployments.
How does the SOT89 package enhance thermal performance over SOT-23?
The SOT89 package features a large exposed collector tab (lead 2) that provides direct thermal conduction to PCB copper, achieving Rth(j-sp) = 13 K/W-over 4× better than typical SOT-23 Rth(j-sp). This enables 1.35 W power dissipation at Tamb = 25 °C with only 6 cm² of 1 oz copper, unlike SOT-23 which saturates below 350 mW.
BSR43-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:
- 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
BSR43-QX FAQ
1.How can I place an order for BSR43-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BSR43-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 BSR43-QX reliable?
The price and inventory of BSR43-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BSR43-QX is usually 5 days.
3.What payment methods are accepted for BSR43-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BSR43-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BSR43-QX?
BSR43-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BSR43-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 BSR43-QX?
For technical support, including BSR43-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BSR43-QX requirements.
6.How does Aetrix verify that BSR43-QX is sourced from the original manufacturer or authorized distributors?
All BSR43-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 BSR43-QX meets industry standards.
7.What is the process for return or replacement of BSR43-QX?
All BSR43-QX units undergo pre-shipment inspection (PSI). If there is an issue with BSR43-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 BSR43-QX part is unused and in its original packaging.
Return procedure for BSR43-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BSR43-QX Tags
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