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Nexperia USA Inc. BC817-40QCZ
- Part No.:
- BC817-40QCZ
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- 3-XDFN Exposed Pad
- Datasheet:
-
BC817-40QCZ.pdf
- Description:
- TRANS NPN 45V 0.5A DFN1412D-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,276
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Product details
Overview
BC817-40QCZ from Nexperia is a 45 V, 500 mA NPN general-purpose transistor in a leadless DFN1412D-3 (SOT8009) package with side-wettable flanks, designed for space-constrained switching and amplification in automotive and industrial PCBs. It delivers DC current gain (hFE) of 250–600 at VCE = 1 V, IC = 100 mA, supports 1 A peak collector current, and is AEC-Q101 qualified.
For engineers reviewing the BC817-40QCZ datasheet, BC817-40QCZ pinout, BC817-40QCZ application, or BC817-40QCZ equivalent, this page provides verified pin functions, thermal derating curves, saturation voltage behavior under 500 mA load, and validated automotive-grade alternatives - all critical for high-reliability board-level design and AOI-compatible assembly.
Technical Context
This NPN bipolar junction transistor operates as a low-voltage, medium-current switch or linear amplifier with base-controlled conduction. Its DFN1412D-3 package enables automated optical inspection via side-wettable flanks and achieves 0.5 mm profile height for ultra-thin designs.
Thermal performance is defined by two Rth(j-a) values: 329 K/W on 35 μm FR4 copper and 261 K/W on 70 μm FR4 copper. The device sustains 150 °C junction temperature and exhibits VCE(sat) ≤ 700 mV at IC = 500 mA / IB = 50 mA, ensuring efficient power-stage operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 45 V - Maximum safe collector-emitter voltage before breakdown under open-base conditions; defines rail compatibility in 24 V and 36 V automotive systems. |
| IC | 500 mA continuous - Sustained collector current rating at 25 °C ambient; supports logic-level load switching without forced cooling. |
| hFE | 250–600 at VCE = 1 V, IC = 100 mA - High and tightly binned DC current gain enables stable biasing with minimal base drive overhead. |
| VCE(sat) | ≤ 700 mV at IC = 500 mA, IB = 50 mA - Low saturation voltage reduces conduction loss and self-heating in switching applications. |
| Ptot | 480 mW on 70 μm FR4 - Total power dissipation limit determines maximum usable current under natural convection in compact layouts. |
| Tj(max) | 150 °C - Maximum junction temperature enabling operation in under-hood automotive environments and sealed industrial enclosures. |
| AEC-Q101 | Qualified - Meets stress test requirements for discrete semiconductors in automotive applications, including temperature cycling and HTRB. |
Pinout & Package
DFN1412D-3 (SOT8009) is a 3-terminal, leadless, ultra-thin plastic package measuring 1.4 × 1.2 × 0.48 mm with side-wettable flanks for solder-joint inspection. It features a 0.8 mm pitch and requires reflow footprint per Figure 17 (Nexperia doc Rev. 2).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base (B) | Current-controlled input node; requires ~50 mA drive to saturate at 500 mA collector load, enabling direct MCU GPIO interfacing. |
| 2 | Emitter (E) | Reference terminal tied to ground or low-side return path; forms common-emitter configuration with fixed voltage gain and phase inversion. |
| 3 | Collector (C) | High-side output node connected to load; handles up to 45 V supply rails and dissipates heat through exposed pad (via PCB copper area). |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use including temperature cycling, HTRB, and ESD testing - eliminates need for additional qualification effort in Tier-1 designs. |
| Side-wettable flanks (SWF) | Enables automated optical inspection (AOI) of solder joints without X-ray; improves first-pass yield in high-volume SMT lines. |
| 0.5 mm package height | Reduces overall board thickness in portable and stacked-module applications where Z-axis clearance is constrained below 1.0 mm. |
| Three hFE bins (16/25/40) | BC817-40QCZ's 250–600 gain range allows precise bias selection for noise-sensitive amplifiers or low-drive switching circuits. |
| Thermal enhancement | 480 mW power dissipation on 70 μm FR4 copper supports higher continuous current than comparable SOT-23 devices without heatsinking. |
Applications
| Automotive Door Module | Industrial PLC Output Stage |
|---|---|
Use Scenario: Driving window lift motor relays and LED status indicators in door control units. IC Role / Device Role / Timing Role: NPN switch controlling 12 V/300 mA inductive loads with fast turn-on/turn-off for PWM dimming and relay debouncing. Use Value: AEC-Q101 qualification ensures reliability across -40 °C to +125 °C ambient; low VCE(sat) minimizes heat generation during sustained actuation. |
Use Scenario: Isolating microcontroller outputs from 24 V DC solenoid valves and indicator lamps in programmable logic controllers. IC Role / Device Role / Timing Role: General-purpose interface transistor providing level translation and current gain between 3.3 V/5 V logic and 24 V field-side loads. Use Value: 45 V VCEO withstands inductive kickback from 24 V solenoids; DFN1412D-3 footprint saves >40% board area versus SOT-23. |
| USB-C Power Delivery Monitor | Medical Sensor Signal Conditioning |
Use Scenario: Enabling/disabling auxiliary power paths and fault reporting LEDs in USB-C PD sink controllers. IC Role / Device Role / Timing Role: Low-power switching element toggling status signals and enable lines with <100 ns propagation delay. Use Value: Tight hFE binning (250–600) ensures consistent base drive requirements across production lots, simplifying firmware calibration. |
Use Scenario: Amplifying low-level analog signals from thermistor or pressure sensor bridges in portable diagnostic equipment. IC Role / Device Role / Timing Role: Linear-mode NPN amplifier in common-emitter configuration delivering stable voltage gain with minimal thermal drift. Use Value: 150 °C Tj(max) supports sterilization cycles; low Cc (3 pF) preserves signal integrity up to 100 MHz bandwidth. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN switching and amplification applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BC847BW | SOT-323 package (2.1 × 1.25 × 0.95 mm); lower IC = 100 mA; hFE = 200–450; not AEC-Q101 qualified. | Limited to low-power consumer electronics; unsuitable for automotive or industrial load switching due to lower current and qualification gap. | Select only for cost-sensitive, non-automotive applications where board height >0.9 mm is acceptable and 100 mA load ceiling suffices. |
| MMBT3904LT1G | SOT-23 package (3.0 × 1.4 × 1.1 mm); same VCEO = 40 V; hFE = 100–300; AEC-Q101 qualified but larger footprint and 0.5 mm taller. | Compatible in automotive signal routing but occupies 2.5× more PCB area; higher Rth(j-a) limits thermal headroom at 500 mA. | Choose when legacy SOT-23 tooling exists and space constraints allow; avoid if minimizing Z-height or maximizing power density is critical. |
Compared with BC817-40QCZ, BC847BW lacks automotive qualification and current capability, while MMBT3904LT1G meets AEC-Q101 but sacrifices 60% board area efficiency and adds 0.02 °C/mW thermal resistance - making BC817-40QCZ optimal for next-gen compact, high-reliability designs.
Availability
BC817-40QCZ is available at Aetrix Electronics and suitable for automotive door modules, industrial PLC output stages, USB-C power delivery monitors, and medical sensor signal conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for BC817-40QCZ 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 efficiency technologies, delivering high-performance, reliable discrete and logic devices for automotive, industrial, and consumer markets.
The BC817QC series belongs to Nexperia's AEC-Q101-qualified general-purpose transistor product line, engineered specifically for robust, space-efficient switching and amplification in harsh-environment electronics where miniaturization and qualification compliance are mandatory.
FAQ
Is BC817-40QCZ pin-compatible with BC817-25QC or BC817-16QC?
Yes - all BC817QC variants share identical DFN1412D-3 (SOT8009) package, pin 1 (base), pin 2 (emitter), pin 3 (collector) assignment, and mechanical footprint. Only DC current gain (hFE) differs: 250–600 for BC817-40QCZ, 160–400 for BC817-25QC, and 100–250 for BC817-16QC. No layout change is required when upgrading gain bins.
What is the recommended reflow profile for BC817-40QCZ?
Nexperia specifies a standard lead-free reflow profile with peak temperature of 260 °C for ≤ 30 seconds, ramp-up rate ≤ 3 °C/s, and time above 217 °C of 60–150 seconds. The DFN1412D-3 package requires stencil-defined solder paste volume matching Figure 17 (0.1 mm thickness, 0.45 × 0.75 mm pads) to ensure wetting on side-wettable flanks and prevent tombstoning.
Does BC817-40QCZ support pulsed operation beyond 500 mA?
Yes - the datasheet specifies ICM = 1 A for single pulses ≤ 1 ms at 25 °C ambient. This enables short-duration surge handling in motor startup or fault-clearing circuits. However, pulse duty cycle must remain ≤ 0.02 (2%) to avoid exceeding Tj(max) = 150 °C, as confirmed by transient thermal impedance curves in Figures 2 and 3.
How does the side-wettable flank (SWF) design impact solder joint inspection?
The SWF geometry exposes solder along the package sidewall, allowing standard AOI systems to capture high-contrast top-down images of the solder meniscus. This eliminates reliance on X-ray for void detection and enables real-time process feedback during reflow, improving yield in high-mix manufacturing without adding inspection cost or cycle time.
BC817-40QCZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BC817QC
- 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:
- 380 mW
- Frequency - Transition:
- 100MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- DFN1412D-3
BC817-40QCZ FAQ
1.How can I place an order for BC817-40QCZ through Aetrix?
Please submit a Request for Quotation (RFQ) for BC817-40QCZ 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 BC817-40QCZ reliable?
The price and inventory of BC817-40QCZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC817-40QCZ is usually 5 days.
3.What payment methods are accepted for BC817-40QCZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC817-40QCZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC817-40QCZ?
BC817-40QCZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC817-40QCZ 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 BC817-40QCZ?
For technical support, including BC817-40QCZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC817-40QCZ requirements.
6.How does Aetrix verify that BC817-40QCZ is sourced from the original manufacturer or authorized distributors?
All BC817-40QCZ 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 BC817-40QCZ meets industry standards.
7.What is the process for return or replacement of BC817-40QCZ?
All BC817-40QCZ units undergo pre-shipment inspection (PSI). If there is an issue with BC817-40QCZ, 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 BC817-40QCZ part is unused and in its original packaging.
Return procedure for BC817-40QCZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC817-40QCZ Tags
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