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Nexperia USA Inc. BC817-40QBZ
- Part No.:
- BC817-40QBZ
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- 3-XDFN Exposed Pad
- Datasheet:
-
BC817-40QBZ.pdf
- Description:
- TRANS NPN 45V 0.5A DFN1110D-3
- Quantity:
- Payment:
- Shipping:
Inventory:14,571
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Product details
Overview
BC817-40QBZ from Nexperia is an AEC-Q101 qualified NPN general-purpose transistor in a DFN1110D-3 (SOT8015) leadless package, delivering 45 V VCEO, 500 mA IC, and hFE of 250–600 at VCE = 1 V / IC = 100 mA. It serves as a compact, high-reliability switching and amplification device in automotive body control modules, LED drivers, and power management stages where space and thermal performance are constrained.
For engineers reviewing the BC817-40QBZ datasheet, BC817-40QBZ pinout, BC817-40QBZ application, or BC817-40QBZ equivalent, key selection criteria include its side-wettable flank design for AOI-compatible solder joint inspection, 0.5 mm profile enabling ultra-thin PCB layouts, and validated operation across −55 °C to +150 °C ambient range in automotive-grade systems.
Technical Context
This transistor operates as a discrete current-controlled switch or linear amplifier with fixed three-terminal topology (base, emitter, collector), optimized for low-voltage DC biasing and medium-current load switching. Its DFN1110D-3 package integrates thermal enhancement via exposed copper pad and side-wettable flanks-enabling reliable reflow soldering and improved heat dissipation on FR4 PCBs with 35 μm or 70 μm copper layers.
The device exhibits pulsed hFE stability (tp ≤ 300 μs, δ ≤ 0.02), low VCE(sat) of ≤700 mV at IC = 500 mA / IB = 50 mA, and fT ≥100 MHz at VCE = 5 V / IC = 10 mA, supporting both digital switching and analog small-signal amplification in compact embedded systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 45 V - Maximum safe collector-emitter voltage under open-base condition; defines upper rail limit for switching applications. |
| IC | 500 mA - Continuous DC collector current rating at 25 °C; sets load-driving capacity in relay drivers or fan controllers. |
| hFE | 250–600 - DC current gain at VCE = 1 V / IC = 100 mA; determines base drive requirements for saturation in switching circuits. |
| VCE(sat) | ≤700 mV - Collector-emitter saturation voltage at IC = 500 mA / IB = 50 mA; directly impacts conduction loss and thermal rise in power stages. |
| Ptot | 350 mW (FR4, 35 μm Cu) - Total power dissipation limit; governs maximum allowable I²R loss before thermal derating applies. |
| Rth(j-a) | 358 K/W - Junction-to-ambient thermal resistance in free air; informs heatsinking needs when operating near power limits. |
| AEC-Q101 | Qualified - Meets stress test requirements for automotive discrete semiconductors; supports use in non-safety-critical vehicle ECUs. |
Pinout & Package
DFN1110D-3 (SOT8015) is a 3-terminal, leadless, ultra-thin surface-mount package measuring 1.1 × 1.0 × 0.48 mm with side-wettable flanks for automated optical inspection and enhanced thermal transfer via bottom-exposed copper pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base (B) | Current-controlled input node; requires precise IB calculation (e.g., IB ≥ IC/hFE(min)) to ensure saturation in switching mode. |
| 2 | Emitter (E) | Reference terminal for bias network; connected to ground or low-side return path; forms common-emitter configuration with collector load. |
| 3 | Collector (C) | Output current terminal; interfaces with load (e.g., LED anode, relay coil, MOSFET gate); must withstand VCEO during off-state. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive under-hood and cabin applications including lighting control and sensor interface modules. |
| Side-wettable flanks | Enables 100% automated optical inspection (AOI) of solder joints without X-ray, reducing post-reflow defect escape. |
| 0.5 mm package height | Supports ultra-low-profile designs such as wearable electronics and slim automotive interior modules. |
| Three hFE variants | BC817-16QB (100–250), BC817-25QB (160–400), BC817-40QB (250–600) allow precise gain matching per circuit requirement. |
| Thermal enhancement | Exposed die pad improves thermal conductivity to PCB; Rth(j-a) drops to 272 K/W with 70 μm copper, enabling higher sustained current. |
Applications
| Automotive Body Control Unit | LED Driver Circuit |
|---|---|
|
Use Scenario: Switching 12 V loads (e.g., door lock actuators, HVAC fans) in vehicle body control modules. IC Role / Device Role / Timing Role: Discrete NPN switch controlling current flow to resistive/inductive loads; driven by microcontroller GPIO with current-limiting base resistor. Use Value: AEC-Q101 qualification ensures reliability over temperature cycling and vibration; low VCE(sat) minimizes power loss and self-heating in sealed enclosures. |
Use Scenario: Constant-current LED string driver in instrument cluster backlighting or exterior signaling. IC Role / Device Role / Timing Role: Linear current regulator using emitter-degeneration resistor; biased in active region for stable IC control. Use Value: Tight hFE spread (250–600) enables predictable current setting; DFN1110D-3 footprint saves board area versus SOT23 in multi-LED arrays. |
| Industrial Sensor Interface | Low-Power Microcontroller Peripheral |
|
Use Scenario: Level-shifting and signal conditioning between 3.3 V MCU I/O and 5–24 V industrial sensors. IC Role / Device Role / Timing Role: Common-emitter amplifier translating logic-level signals to higher-voltage domains; configured with fixed bias network. Use Value: fT ≥100 MHz supports clean edge transitions up to ~10 MHz; low Cc (3 pF) preserves signal integrity in fast-switching interfaces. |
Use Scenario: Driving small solenoids, buzzers, or optocouplers from battery-powered IoT nodes. IC Role / Device Role / Timing Role: Low-duty-cycle switching element activated by sleep-mode wake-up interrupts; operated in saturation with minimal base drive. Use Value: Ultra-low standby current (ICBO ≤100 nA) extends battery life; 0.48 mm height allows stacking under connectors or shields in space-constrained modules. |
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 |
|---|---|---|---|
| BC817-40,115 (SOT23) | Same electrical specs but in larger SOT23 package (2.9 × 1.3 × 1.0 mm); no side-wettable flanks; Rth(j-a) ≈ 400 K/W. | Lacks AOI support and thermal performance; suitable only where board space and inspection capability permit larger footprint. | Select when legacy SOT23 layout exists and AEC-Q101 is not required; avoid in new automotive designs needing AOI or thin-profile constraints. |
| MMBT3904LT1G | Lower VCEO (40 V), lower hFE (100–300), same SOT23 package; not AEC-Q101 qualified; Ptot = 310 mW. | Not rated for automotive under-hood environments; limited to commercial-temp consumer or industrial applications. | Choose only for cost-sensitive, non-automotive applications where 40 V rating suffices and thermal margin is adequate. |
Compared with BC817-40,115 and MMBT3904LT1G, BC817-40QBZ provides superior manufacturability (AOI-ready), thermal efficiency (35% lower Rth(j-a) vs SOT23), and automotive compliance-making it the optimal choice for new space- and reliability-critical designs.
Availability
BC817-40QBZ is available at Aetrix Electronics and suitable for automotive body electronics, LED lighting systems, and industrial sensor interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for BC817-40QBZ 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 system functionality, delivering high-performance, high-reliability components for automotive, industrial, mobile, and computing markets.
The BC817QB series belongs to Nexperia's AEC-Q101-qualified general-purpose transistor portfolio, engineered specifically for robust, space-efficient switching and amplification in harsh-environment automotive and industrial control systems.
FAQ
Is BC817-40QBZ pin-compatible with standard SOT23 transistors?
No. BC817-40QBZ uses the DFN1110D-3 (SOT8015) package with side-wettable flanks and a 0.65 mm pitch, differing physically and electrically from SOT23's 2.9 × 1.3 mm outline and 1.9 mm pitch. Layout redesign and stencil adjustment are required for migration.
What is the maximum continuous collector current at 100 °C ambient?
At Tamb = 100 °C, the device's Ptot derates to approximately 220 mW (based on Fig. 1's 350 mW curve). With VCE(sat) ≤700 mV, maximum sustainable IC is ~315 mA-calculated as √(Ptot/RCE(sat)), assuming dominant conduction loss.
Does BC817-40QBZ support lead-free reflow soldering?
Yes. The DFN1110D-3 package is qualified for standard lead-free reflow profiles (J-STD-020), with peak temperatures up to 260 °C. Figure 17 provides recommended solder paste stencil thickness (0.1 mm) and land pattern dimensions for reliable joint formation.
How does the side-wettable flank design improve manufacturing yield?
Side-wettable flanks enable full optical visibility of solder fillets during AOI, eliminating reliance on X-ray for void detection. This reduces false call rates and increases first-pass yield in high-volume automotive PCB assembly, especially for fine-pitch 0.65 mm terminations.
BC817-40QBZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BC817QB
- Package/Case:
- 3-XDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 500 mA
- Voltage - Collector Emitter Breakdown (Max):
- 45 V
- Vce Saturation (Max) @ Ib, Ic:
- 700mV @ 50mA, 500mA
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 250 @ 100mA, 1V
- Power - Max:
- 350 mW
- Frequency - Transition:
- 100MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- DFN1110D-3
BC817-40QBZ FAQ
1.How can I place an order for BC817-40QBZ through Aetrix?
Please submit a Request for Quotation (RFQ) for BC817-40QBZ 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 BC817-40QBZ reliable?
The price and inventory of BC817-40QBZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC817-40QBZ is usually 5 days.
3.What payment methods are accepted for BC817-40QBZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC817-40QBZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC817-40QBZ?
BC817-40QBZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC817-40QBZ 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 BC817-40QBZ?
For technical support, including BC817-40QBZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC817-40QBZ requirements.
6.How does Aetrix verify that BC817-40QBZ is sourced from the original manufacturer or authorized distributors?
All BC817-40QBZ 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 BC817-40QBZ meets industry standards.
7.What is the process for return or replacement of BC817-40QBZ?
All BC817-40QBZ units undergo pre-shipment inspection (PSI). If there is an issue with BC817-40QBZ, 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 BC817-40QBZ part is unused and in its original packaging.
Return procedure for BC817-40QBZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC817-40QBZ Tags
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