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Nexperia USA Inc. BC817-40W,115
- Part No.:
- BC817-40W,115
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- SC-70, SOT-323
- Datasheet:
-
BC817-40W,115.pdf
- Description:
- TRANS NPN 45V 0.5A SOT-323
- Quantity:
- Payment:
- Shipping:
Inventory:47,504
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Product details
Overview
BC817-40W,115 from Nexperia is an NPN general-purpose transistor in SOT323 (SC-70) package, rated for 45 V VCEO, 500 mA continuous IC, and DC current gain (hFE) of 250–600 at VCE = 1 V, IC = 100 mA. It serves as a compact, surface-mount switching and amplification device in low-power signal paths, power management blocks, and interface circuitry of industrial control modules.
For engineers reviewing the BC817-40W,115 datasheet, BC817-40W,115 pinout, BC817-40W,115 application, or BC817-40W,115 equivalent, key selection criteria include verified hFE range, thermal resistance (Rth(j-a) = 431 K/W on 1 cm² collector pad), VCE(sat) ≤ 700 mV at IC = 500 mA/IB = 50 mA, and SC-70 footprint compatibility with high-density PCB layouts.
Technical Context
This discrete NPN bipolar junction transistor operates in linear or saturated switching modes with base-controlled current amplification. Its hFE binning (250–600) ensures predictable gain across production lots, while the 45 V VCEO rating supports operation in 24 V and 36 V industrial bus interfaces without derating.
Thermal performance is defined by two mounting conditions: Rth(j-a) = 625 K/W on standard FR4 footprint and 431 K/W with extended 1 cm² collector pad - enabling design flexibility between space-constrained and thermally demanding applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 45 V - Maximum safe collector-emitter voltage under open-base condition; enables use in 24 V systems with 2× safety margin. |
| IC (continuous) | 500 mA - Continuous collector current at Tamb = 25 °C; sufficient for driving LEDs, small relays, and logic-level MOSFET gates. |
| hFE | 250–600 at VCE = 1 V, IC = 100 mA - Tight gain binning reduces base drive variability in production designs. |
| VCE(sat) | ≤ 700 mV at IC = 500 mA, IB = 50 mA - Low saturation voltage minimizes power loss and self-heating during switching. |
| fT | 100 MHz - Transition frequency supports stable amplification up to audio and low-speed digital signal frequencies. |
| Rth(j-a) | 431 K/W with 1 cm² collector pad - Enables 290 mW power dissipation at ambient temperatures up to 125 °C in thermally optimized layouts. |
Pinout & Package
SOT323 (SC-70) is a 3-pin, surface-mount plastic package measuring 2.2 mm × 1.35 mm × 0.95 mm (L × W × H), optimized for automated placement and reflow soldering on high-density PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base (B) | Current-controlled input node; requires ~12 mA base drive for full 500 mA collector conduction (IC/IB = 42 typical). |
| 2 | Emitter (E) | Reference terminal for biasing; connected to ground or common return path in low-side switch configurations. |
| 3 | Collector (C) | High-current output node; routed to load or next stage; thermal pad connection point for enhanced heat dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Three hFE bins | BC817-40W provides 250–600 hFE, enabling precise base resistor selection without post-production gain sorting. |
| Low VCE(sat) | 700 mV max at full-rated current reduces conduction losses by >30% versus legacy general-purpose transistors. |
| SC-70 footprint | 0.65 mm pitch and 2.2 mm length allow placement in <1.5 mm² board area - critical for wearables and sensor nodes. |
| 150 °C Tj(max) | Extended junction temperature rating supports operation in sealed enclosures or near heat sources without derating. |
Applications
| Industrial Sensor Interface | LED Driver Circuit |
|---|---|
|
Use Scenario: Amplifying low-level analog signals from RTD or thermistor bridges before ADC sampling in programmable logic controllers. IC Role / Device Role / Timing Role: Linear-mode NPN amplifier configured in common-emitter topology with emitter degeneration for stable DC gain. Use Value: 100 MHz fT and 250–600 hFE ensure bandwidth and gain consistency across temperature (−55 °C to +150 °C). |
Use Scenario: Driving 350 mA white LED strings from 3.3 V or 5 V microcontroller GPIO pins in smart lighting modules. IC Role / Device Role / Timing Role: Low-side saturated switch with fixed base resistor; toggled at ≤1 kHz PWM frequency. Use Value: VCE(sat) ≤ 700 mV limits power loss to <250 mW, eliminating need for heatsinking in compact housings. |
| Power Supply Enable Switch | Level Translation Interface |
|
Use Scenario: Enabling/disabling 12 V auxiliary rails in embedded power management units using 3.3 V logic control signals. IC Role / Device Role / Timing Role: High-side or low-side enable switch operating in saturation with minimal propagation delay. Use Value: 45 V VCEO and 500 mA IC support direct control of 12 V/300 mA loads without external driver stages. |
Use Scenario: Translating 1.8 V logic outputs to 5 V-compatible inputs in mixed-voltage MCU peripherals (e.g., UART, SPI). IC Role / Device Role / Timing Role: Single-transistor level shifter in open-collector configuration with pull-up to 5 V rail. Use Value: Fast turn-on/off (driven by fT = 100 MHz) ensures clean edge integrity up to 10 Mbps data rates. |
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,115 | Lower VCEO (45 V same), but hFE = 200–450 and higher fT (300 MHz); smaller die size. | Better for high-frequency amplification; less suitable for 500 mA switching due to lower IC rating (100 mA). | Select when signal bandwidth >50 MHz is required and load current <100 mA. |
| MMBT3904LT1G | Same SOT23 package (not SC-70), VCEO = 40 V, hFE = 100–300, Ptot = 310 mW. | Larger footprint (SOT23 vs SOT323) and wider hFE spread increase base resistor tolerance sensitivity. | Choose only if SOT23 is already standardized in the BOM and thermal margin >100 mW is available. |
Compared with BC817-40W,115, BC847BW,115 trades current capacity for speed, while MMBT3904LT1G sacrifices package miniaturization and gain consistency for broader industry availability - making BC817-40W optimal for space-constrained, medium-current switching where gain stability matters.
Availability
BC817-40W,115 is available at Aetrix Electronics and suitable for industrial sensor interfaces, LED driver circuits, and power supply enable switches requiring stable component supply, consistent hFE binning, and SC-70 footprint reliability.
Supply support for BC817-40W,115 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 essential semiconductors - delivering discrete, logic, and MOSFET solutions for automotive, industrial, and consumer markets.
The BC817W series belongs to Nexperia's general-purpose transistor product line, engineered for cost-sensitive, space-constrained applications demanding robust performance, tight parametric consistency, and seamless SMT manufacturability.
FAQ
What is the maximum allowable junction temperature for BC817-40W,115?
The absolute maximum junction temperature (Tj) is 150 °C, as specified in Table 6 of the Nexperia datasheet Rev. 8. Operation above this limit risks permanent degradation of hFE and increased leakage currents. Derating is required above 25 °C ambient per the power derating curves in Figure 1, especially when mounted on standard FR4 without extended copper.
Does BC817-40W,115 support automotive applications?
No - BC817-40W,115 is explicitly designated as non-automotive qualified per Section 13 of the datasheet. Nexperia states that automotive alternatives (e.g., BC817W-Q series) must be selected for AEC-Q101-compliant designs. This part lacks automotive-grade screening, qualification testing, and failure rate documentation.
How does the 250–600 hFE range affect base resistor selection?
The wide hFE bin requires base resistors sized for worst-case minimum gain (250) to guarantee saturation at full 500 mA load. For example, with IB = 2 mA, the transistor remains saturated even at hFE = 250 (IC/IB = 250), avoiding unintended linear-mode operation and thermal runaway.
Can BC817-40W,115 replace BC817-25W in an existing design?
Yes - both share identical package, pinout, and voltage/current ratings; only hFE differs (250–600 vs 160–400). Substitution is electrically safe and often improves base drive margin, but verify that higher gain doesn't cause instability in linear amplifier configurations or excessive overshoot in fast-switching loads.
BC817-40W,115 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:
- 250 @ 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
BC817-40W,115 FAQ
1.How can I place an order for BC817-40W,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for BC817-40W,115 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 BC817-40W,115 reliable?
The price and inventory of BC817-40W,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC817-40W,115 is usually 5 days.
3.What payment methods are accepted for BC817-40W,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC817-40W,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC817-40W,115?
BC817-40W,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC817-40W,115 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 BC817-40W,115?
For technical support, including BC817-40W,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC817-40W,115 requirements.
6.How does Aetrix verify that BC817-40W,115 is sourced from the original manufacturer or authorized distributors?
All BC817-40W,115 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 BC817-40W,115 meets industry standards.
7.What is the process for return or replacement of BC817-40W,115?
All BC817-40W,115 units undergo pre-shipment inspection (PSI). If there is an issue with BC817-40W,115, 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 BC817-40W,115 part is unused and in its original packaging.
Return procedure for BC817-40W,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC817-40W,115 Tags
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MMBT3906LT1G
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MMBT3904-7-F
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MMBT3904LT1G
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BC847B,215
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