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BC817-40-Q
+BOMTRANS NPN 45V 0.8A SOT23-3
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ManufacturerDiotec Semiconductor
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Mfr. Part #BC817-40-Q
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In Stock14547
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Specifications
| Attribute | Value |
| Part Status | Discontinued at DigiKey |
| 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 (ICBO) |
| DC Current Gain (h FE) (Min) @ Ic, Vce | 250 @ 100mA, 1V |
| Power - Max | 310 mW |
| Frequency - Transition | 100MHz |
| Operating Temperature | -55°C ~ 150°C (TJ) |
| Mounting Type | Surface Mount |
| Package / Case | TO-236-3, SC-59, SOT-23-3 |
| Supplier Device Package | SOT-23-3 (TO-236) |
| Packaging | Cut Tape (CT), Tape & Reel (TR) |
| Grade | Automotive |
| Qualification | AEC-Q101 |
Overview
Description
BC817-40-Q is a small-signal NPN transistor from the BC817 family. It comes in a SOT-23 package. The “-40” indicates a Vceo of about 40 V and a maximum collector current around 0.5 A. The device offers moderate to high current gain (hFE) that varies with lot and bias, suitable for both switching and amplification in low‑power designs. The “-Q” suffix typically means RoHS/lead‑free compliance (vendor-specific). Because exact specs (hFE, Vcesat, leakage) and the pinout can vary by manufacturer, always consult the supplier’s datasheet for the specific part you’re using. Common uses include microcontroller interfacing, signal buffering, level shifting, and simple switches. In short: a general-purpose, low‑to‑medium power NPN transistor with 40 V rating, suitable for many small-signal tasks when the precise electrical parameters are checked in the chosen vendor’s datasheet.
Equivalent
BC817-40-Q is an NPN general-purpose transistor (Vceo ~45V, Ic up to 500mA, high gain; automotive grade). Close equivalents:
- Through-hole: 2N2222A, 2N4401
- SMD: MMBT2222A, MMBT4401
- Other BC817 family parts: BC817-40 (or BC817-16/25)
- Automotive-grade substitutes from other vendors with similar specs
Note: pinouts may differ; verify orientation and hFE range for your circuit.
- Through-hole: 2N2222A, 2N4401
- SMD: MMBT2222A, MMBT4401
- Other BC817 family parts: BC817-40 (or BC817-16/25)
- Automotive-grade substitutes from other vendors with similar specs
Note: pinouts may differ; verify orientation and hFE range for your circuit.
Features
BC817-40-Q features (concise):
- NPN general‑purpose transistor for switching and amplification
- Ic up to 500 mA; Vceo = 45 V
- High DC gain (hFE in the BC817-40 group; high‑gain variant)
- Low Vce(sat) around 0.2–0.3 V at moderate Ic/ Ib currents
- Fast switching capability; suitable for logic, drivers, small motors, etc.
- Package: TO‑92 (through‑hole); automotive‑grade variant available in Pb‑free, RoHS compliant format (-Q)
- Temperature range: roughly −55 °C to +150 °C (industrial/automotive qualified)
- Complementary to BC807 series
Note: Exact hFE and packaging options can vary by supplier; the -Q suffix indicates automotive qualification and Pb‑free/RoHS compliance.
- NPN general‑purpose transistor for switching and amplification
- Ic up to 500 mA; Vceo = 45 V
- High DC gain (hFE in the BC817-40 group; high‑gain variant)
- Low Vce(sat) around 0.2–0.3 V at moderate Ic/ Ib currents
- Fast switching capability; suitable for logic, drivers, small motors, etc.
- Package: TO‑92 (through‑hole); automotive‑grade variant available in Pb‑free, RoHS compliant format (-Q)
- Temperature range: roughly −55 °C to +150 °C (industrial/automotive qualified)
- Complementary to BC807 series
Note: Exact hFE and packaging options can vary by supplier; the -Q suffix indicates automotive qualification and Pb‑free/RoHS compliance.
Pinout
- Pin count: 3 pins (SOT-23 package)
- Function: NPN general‑purpose transistor for switching or amplification (BC817 family; -40‑Q denotes a high‑gain variant).
- Function: NPN general‑purpose transistor for switching or amplification (BC817 family; -40‑Q denotes a high‑gain variant).
Manufacturer
Manufacturer: Nexperia.
What kind of company: A global semiconductor company (Dutch-based, headquartered in Nijmegen) that designs and manufactures discrete components, such as transistors, diodes, and logic/MOSFET devices.
What kind of company: A global semiconductor company (Dutch-based, headquartered in Nijmegen) that designs and manufactures discrete components, such as transistors, diodes, and logic/MOSFET devices.
Application
BC817-40-Q is a general‑purpose NPN transistor in an SOT‑23 package. Common application areas include:
- Low‑power switching and small‑signal amplification
- Relay and LED driver circuits
- Microcontroller interface, level shifting and buffering
- Sensor signal conditioning and pre‑amplification
- General purpose amplification/switching in consumer, automotive and industrial electronics
- Low‑power switching and small‑signal amplification
- Relay and LED driver circuits
- Microcontroller interface, level shifting and buffering
- Sensor signal conditioning and pre‑amplification
- General purpose amplification/switching in consumer, automotive and industrial electronics
Package
SOT-23 (3-pin) surface-mount package; the “-Q” suffix typically denotes RoHS-compliant/lead-free.
