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Nexperia USA Inc. BC817W-QF
- Part No.:
- BC817W-QF
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- SC-70, SOT-323
- Datasheet:
-
BC817W-QF.pdf
- Description:
- TRANS NPN 45V 0.5A SOT-323
- Quantity:
- Payment:
- Shipping:
Inventory:3,937
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Product details
Overview
BC817W-Q from Nexperia is an AEC-Q101-qualified NPN general-purpose transistor in SOT323 (SC-70) package, rated for 45 V VCEO, 500 mA IC, and DC current gain (hFE) of 100–600 at VCE = 1 V, IC = 100 mA. It serves as a compact, automotive-grade switching and amplification device in space-constrained PCBs.
For engineers reviewing the BC817W-Q datasheet, BC817W-Q pinout, BC817W-Q application, or BC817W-Q equivalent, this part supports high-reliability automotive signal conditioning, low-power load switching, and discrete amplifier stages where thermal performance and AEC-Q101 compliance are mandatory design requirements.
Technical Context
This NPN bipolar junction transistor operates with open-base collector-emitter breakdown voltage of 45 V and emitter-base breakdown voltage of 5 V, enabling robust operation in 12 V/24 V automotive supply rails. Its pulsed peak collector current reaches 1 A with tp ≤ 1 ms, supporting transient load handling in relay drivers and LED matrix controls.
Thermal resistance Rth(j-a) is 625 K/W on standard FR4 PCB (single-sided copper), and derates linearly above 25 °C ambient - critical for thermal design in sealed enclosures. The device exhibits fT = 100 MHz at VCE = 5 V, IC = 10 mA, confirming suitability for low-frequency switching (<10 MHz) and audio preamplifier biasing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 45 V - Maximum safe collector-emitter voltage under open-base condition; defines rail compatibility with 36 V automotive systems. |
| IC | 500 mA continuous - Sustained DC load current capability; supports driving small solenoids, fans, or logic-level MOSFET gates. |
| hFE | 100–600 at VCE = 1 V, IC = 100 mA - Wide DC current gain range enables flexible base drive design without tight tolerance matching. |
| VCE(sat) | ≤ 700 mV at IC = 500 mA, IB = 50 mA - Low saturation voltage minimizes power loss and self-heating in switching applications. |
| Ptot | 200 mW (standard footprint) - Power dissipation limit determines maximum steady-state switching frequency before thermal throttling. |
| fT | 100 MHz - Transition frequency confirms usable bandwidth for audio-range amplification and fast digital switching up to ~10 MHz. |
| Rth(j-a) | 625 K/W - Junction-to-ambient thermal resistance on standard FR4; informs heatsinking needs for >150 mW average power. |
Pinout & Package
SOT323 (SC-70) plastic surface-mounted package: ultra-compact 3-lead outline with 0.65 mm lead pitch, optimized for high-density routing and reflow soldering per IPC-7351B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base (B) | Current-controlled input node; requires 5–50 mA drive for full saturation at 500 mA collector load. |
| 2 | Emiter (E) | Reference terminal for current flow; connected to ground or low-side return path in common-emitter configuration. |
| 3 | Collector (C) | High-current output node; handles switched loads up to 500 mA with <700 mV drop when saturated. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive temperature range (−40 °C to +150 °C) and mechanical stress; eliminates need for additional qualification testing. |
| Three hFE variants | BC817-16W-Q (100–250), BC817-25W-Q (160–400), BC817-40W-Q (250–600) - Enables precise gain binning for consistent switching thresholds across production lots. |
| Low VCE(sat) | ≤ 700 mV at IC/IB = 10 - Reduces conduction loss by >30% vs. legacy general-purpose transistors, improving efficiency in battery-powered modules. |
| SC-70 footprint | 2.2 × 1.35 mm body size - Saves >60% board area vs. SOT23, enabling miniaturized ECU sensor interfaces and ADAS sub-modules. |
| High fT | 100 MHz - Supports stable operation in 1–5 MHz PWM dimming circuits and analog front-end buffering without phase margin loss. |
Applications
| Automotive Door Module Switching | Industrial Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Controlling window lift motors and mirror actuators in door control units using 12 V supply rails. IC Role / Device Role / Timing Role: NPN switch driving MOSFET gate or directly switching resistive/inductive loads up to 500 mA. Use Value: AEC-Q101 qualification ensures reliability over 15-year vehicle lifetime; low VCE(sat) reduces heat buildup in sealed module housings. |
Use Scenario: Amplifying low-level analog outputs (e.g., thermistor, RTD, or bridge sensor) before ADC sampling in PLC I/O modules. IC Role / Device Role / Timing Role: Discrete common-emitter amplifier stage providing 20–40 dB voltage gain with stable DC bias point. Use Value: Wide hFE range allows predictable gain setting via emitter degeneration resistor; fT supports bandwidth up to 100 kHz. |
| Consumer Appliance Motor Control | Medical Portable Device Load Switching |
|
Use Scenario: Driving small DC brush motors in smart home appliances (e.g., coffee grinders, air purifiers) with microcontroller GPIO. IC Role / Device Role / Timing Role: Low-side switch interfacing MCU output to motor winding, with flyback diode integration. Use Value: 1 A pulsed rating accommodates motor inrush currents; SC-70 package enables dense placement near motor connectors. |
Use Scenario: Enabling/disabling power to patient monitoring sensors (e.g., SpO₂ LEDs, ECG electrodes) in battery-operated handheld devices. IC Role / Device Role / Timing Role: Precision on/off control with minimal leakage (ICBO ≤ 100 nA) to preserve battery life during sleep mode. Use Value: Low ICBO and guaranteed hFE down to −40 °C ensure reliable wake-up behavior in cold clinical environments. |
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 |
|---|---|---|---|
| BC847BW-Q | Lower VCEO (45 V same), lower IC (100 mA), higher hFE (110–800), same SOT323 package | Optimized for low-current signal amplification, not power switching | Select when gain stability at µA–mA levels matters more than 500 mA load handling. |
| MMBT3904-7-F | Same VCEO (40 V), same IC (200 mA), hFE 100–300, SOT23 package (larger than SOT323) | Non-automotive grade; lacks AEC-Q101 qualification and thermal specs for automotive use | Acceptable only for cost-sensitive industrial prototypes where automotive reliability is not required. |
Compared with BC847BW-Q and MMBT3904-7-F, BC817W-Q uniquely balances 500 mA switching capability, AEC-Q101 compliance, and SC-70 miniaturization - making it the only choice for production automotive modules requiring both current drive and space constraints.
Availability
BC817W-Q is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and portable medical device designs requiring stable component supply with guaranteed long-term availability.
Supply support for BC817W-Q 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 BC817W-Q belongs to Nexperia's AEC-Q101-qualified general-purpose transistor family, engineered specifically for automotive subsystems demanding robustness, thermal resilience, and compact packaging in harsh environments.
FAQ
Is BC817W-Q pin-compatible with BC847BW-Q?
No - although both use SOT323 packages, BC817W-Q has base-collector-emitter pinout (1-B, 2-E, 3-C), while BC847BW-Q uses emitter-base-collector (1-E, 2-B, 3-C). Swapping them without PCB revision causes circuit failure due to reversed polarity.
What is the maximum operating temperature for BC817W-Q in continuous use?
The junction temperature must not exceed 150 °C. At ambient temperatures up to 85 °C, continuous operation at 500 mA requires thermal derating: power dissipation drops to ~120 mW above 25 °C ambient, per the 625 K/W Rth(j-a) curve.
Does BC817W-Q support PWM switching at 25 kHz?
Yes - with fT = 100 MHz and VCE(sat) ≤ 700 mV, it fully supports 25 kHz PWM for LED dimming or motor speed control. Switching losses remain low due to fast turn-on/off times (<100 ns typical) and negligible storage time.
How does the hFE variation affect base resistor selection?
With hFE spanning 100–600, base resistors must be sized for worst-case minimum gain (100) to guarantee saturation at 500 mA. For 3.3 V MCU drive, RB ≤ 5.6 kΩ ensures ≥5 mA IB, maintaining IC/IB ≤ 10 across all bins.
BC817W-QF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- 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:
- 100 @ 100mA, 1V
- Power - Max:
- 200 mW
- Frequency - Transition:
- 100MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
BC817W-QF FAQ
1.How can I place an order for BC817W-QF through Aetrix?
Please submit a Request for Quotation (RFQ) for BC817W-QF 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 BC817W-QF reliable?
The price and inventory of BC817W-QF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC817W-QF is usually 5 days.
3.What payment methods are accepted for BC817W-QF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC817W-QF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC817W-QF?
BC817W-QF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC817W-QF 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 BC817W-QF?
For technical support, including BC817W-QF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC817W-QF requirements.
6.How does Aetrix verify that BC817W-QF is sourced from the original manufacturer or authorized distributors?
All BC817W-QF 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 BC817W-QF meets industry standards.
7.What is the process for return or replacement of BC817W-QF?
All BC817W-QF units undergo pre-shipment inspection (PSI). If there is an issue with BC817W-QF, 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 BC817W-QF part is unused and in its original packaging.
Return procedure for BC817W-QF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC817W-QF Tags
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BC846BLT1G
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BC847B,215
Nexperia USA Inc.
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