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Diodes Incorporated BC817-40-7
- Part No.:
- BC817-40-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BC817-40-7.pdf
- Description:
- TRANS NPN 45V 0.8A SOT-23-3
- Quantity:
- Payment:
- Shipping:
Inventory:9,409
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Product details
Overview
BC817-40-7 from Diodes Incorporated is a 45 V, 500 mA NPN small-signal transistor in SOT23 package, featuring hFE = 250–600 at IC = 100 mA and VCE = 1.0 V, VCE(SAT) ≤ 0.7 V at IC = 500 mA/IB = 50 mA, and fT = 100 MHz - used for switching and audio-frequency amplification in automotive and industrial control circuits.
For engineers reviewing the BC817-40-7 datasheet, BC817-40-7 pinout, BC817-40-7 application, or BC817-40-7 equivalent, key selection criteria include DC current gain spread (250–600), AEC-Q101 qualification, SOT23 thermal resistance (RθJA = 403 °C/W), and complementary PNP availability (BC807 series).
Technical Context
This NPN bipolar junction transistor uses epitaxial planar die construction for stable gain and low leakage. It operates with VCEO = 45 V, IC = 500 mA continuous, and supports pulsed base drive up to IBM = 200 mA.
Designed for automatic insertion and RoHS-compliant manufacturing, it delivers verified ESD robustness (HBM = 8 kV) and operates across –65 °C to +150 °C. Its gain-bandwidth product of 100 MHz enables reliable AF amplifier and digital switching performance up to ~10 MHz edge rates.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 45 V - maximum safe collector-emitter voltage before breakdown in common-emitter configuration |
| hFE (IC = 100 mA) | 250–600 - wide DC current gain range enabling consistent biasing across production lots |
| VCE(SAT) | ≤ 0.7 V at IC = 500 mA / IB = 50 mA - low saturation voltage reduces conduction loss in switching applications |
| fT | 100 MHz - usable bandwidth for audio amplification and medium-speed digital switching |
| PD | 310 mW on FR-4 PCB - power handling limited by SOT23 thermal resistance (403 °C/W) |
| ESD HBM | 8,000 V - high electrostatic discharge immunity suitable for automated assembly environments |
Pinout & Package
Package: SOT23 - surface-mount plastic case, 0.008 g weight, UL 94V-0 rated, matte tin-plated leads, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Emission terminal for majority carriers | Reference node for bias network; connects to ground or low-impedance return path |
| 2 (Base) | Control electrode for carrier injection | Receives current-limited drive signal; requires series resistor to limit IB ≤ 200 mA peak |
| 3 (Collector) | Current collection terminal | Connects to load or supply rail; handles up to 500 mA continuous current with VCE ≤ 45 V |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTOL, and ESD stress |
| Lead-free & halogen-free | Meets RoHS 2 (2011/65/EU) and "Green" definition (<900 ppm Br/Cl, <1000 ppm Sb) |
| Complementary PNP pairing | Direct match with BC807 series for push-pull and differential pair designs |
| Epitaxial planar construction | Ensures tight parameter distribution and low leakage (ICES ≤ 100 nA at VCE = 45 V) |
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 relay coils and 20 mA indicator LEDs. Use Value: Low VCE(SAT) minimizes heat rise in confined module space; AEC-Q101 rating ensures field reliability. |
Use Scenario: Level-shifting and current amplification for 24 V DC output drivers in programmable logic controllers. IC Role / Device Role / Timing Role: Interface transistor translating microcontroller GPIO signals to higher-current loads. Use Value: hFE ≥ 250 enables single-stage drive of 500 mA solenoid loads without Darlington stacking. |
| Consumer Audio Preamp | Medical Sensor Signal Conditioning |
|
Use Scenario: Low-noise voltage amplification stage in portable headphone amplifiers. IC Role / Device Role / Timing Role: Common-emitter AF amplifier with emitter degeneration for linearity. Use Value: fT = 100 MHz provides headroom for clean 20 kHz signal reproduction with minimal phase shift. |
Use Scenario: Amplifying weak analog outputs from thermistor or photodiode front-ends in patient monitoring devices. IC Role / Device Role / Timing Role: Low-leakage DC-coupled gain stage with ICES ≤ 100 nA at 45 V. Use Value: Ultra-low collector cutoff current preserves accuracy in high-impedance sensor interfaces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN small-signal transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BC817-40-7-F | Same silicon die and SOT23 package; differs only in tape-and-reel marking (K6C vs K6C-F) and RoHS compliance documentation | No functional difference; identical electrical specs and thermal behavior | Select when full AEC-Q101 traceability and formal RoHS 2 certification are required |
| MMBT4401-7-F | Higher VCEO = 40 V (vs 45 V), hFE = 100–300 (narrower range), fT = 250 MHz | Better high-frequency response but lower gain consistency and reduced voltage margin | Prefer for RF-adjacent signal paths where speed outweighs gain stability needs |
Compared with BC817-40-7, BC817-40-7-F offers identical performance with enhanced compliance documentation, while MMBT4401-7-F trades gain consistency and voltage headroom for higher fT, making it suitable for faster-switching, lower-voltage applications.
Availability
BC817-40-7 is available at Aetrix Electronics and suitable for automotive door modules, industrial PLC output stages, consumer audio preamplifiers, and medical sensor signal conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for BC817-40-7 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the Americas.
The BC817 series belongs to Diodes' AEC-Q101-qualified small-signal transistor portfolio, engineered specifically for automotive body electronics and industrial control systems demanding high reliability and consistent parametric performance.
FAQ
Is BC817-40-7 suitable for automotive applications?
Yes - BC817-40-7 is qualified to AEC-Q101 standards and specified for operation from –65 °C to +150 °C. Its construction, testing, and packaging meet automotive requirements for temperature cycling, humidity, and ESD robustness, making it appropriate for non-safety-critical body electronics such as lighting controls and window modules.
What is the maximum continuous collector current for BC817-40-7?
The absolute maximum continuous collector current is 500 mA at TA = +25 °C. Derating applies above 25 °C: power dissipation drops linearly to zero at 150 °C, governed by RθJA = 403 °C/W on standard FR-4 PCB layout. Peak pulsed current is rated at 1.0 A with duty cycle ≤ 2%.
How does BC817-40-7 differ from BC817-25-7?
BC817-40-7 has a higher guaranteed hFE range (250–600 at IC = 100 mA) versus BC817-25-7 (160–400). Both share identical VCEO, VCE(SAT), fT, and package. The -40 variant allows simpler bias design in high-gain applications like low-level amplification or low-drive switching.
Can BC817-40-7 replace BC847C in existing designs?
Not directly - BC847C has VCEO = 45 V and hFE = 420–800, but uses SOT23-3 with different pinout (E-B-C vs E-B-C same order) and higher fT (300 MHz). While electrically similar, BC817-40-7's lower fT and tighter gain range may require revalidation of switching timing and stability margins in high-speed circuits.
BC817-40-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 800 mA
- Voltage - Collector Emitter Breakdown (Max):
- 45 V
- Vce Saturation (Max) @ Ib, Ic:
- 700mV @ 50mA, 500mA
- Current - Collector Cutoff (Max):
- 100nA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 250 @ 100mA, 1V
- Power - Max:
- 310 mW
- Frequency - Transition:
- 100MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
BC817-40-7 FAQ
1.How can I place an order for BC817-40-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for BC817-40-7 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 BC817-40-7 reliable?
The price and inventory of BC817-40-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC817-40-7 is usually 5 days.
3.What payment methods are accepted for BC817-40-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC817-40-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC817-40-7?
BC817-40-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC817-40-7 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 BC817-40-7?
For technical support, including BC817-40-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC817-40-7 requirements.
6.How does Aetrix verify that BC817-40-7 is sourced from the original manufacturer or authorized distributors?
All BC817-40-7 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 BC817-40-7 meets industry standards.
7.What is the process for return or replacement of BC817-40-7?
All BC817-40-7 units undergo pre-shipment inspection (PSI). If there is an issue with BC817-40-7, 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 BC817-40-7 part is unused and in its original packaging.
Return procedure for BC817-40-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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