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Product Detailed Parameters
- Description：RF TRANS NPN 20V TO-92-3
- Series：-
- Mfr：onsemi
- Package：Tape & Box (TB)
- Transistor Type：NPN
- Voltage - Collector Emitter Breakdown (Max)：20V
- Frequency - Transition：-
- Noise Figure (dB Typ @ f)：-
- Gain：-
- Power - Max：350mW
- DC Current Gain (hFE) (Min) @ Ic, Vce：67 @ 1mA, 10V
- Current - Collector (Ic) (Max)：30mA
- Operating Temperature：150°C (TJ)
- Mounting Type：Through Hole
- Package / Case：TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Supplier Device Package：TO-92-3
- Grade：-
- Qualification：-
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Overview
The BF494_D74Z is an NPN small signal transistor manufactured by onsemi, housed in a TO-92 three-pin through-hole package. It is designed for general-purpose amplification and switching applications. Key electrical characteristics include a maximum collector-emitter voltage of 20 V, a maximum collector-base voltage of 30 V, and a continuous collector current rating of 30 mA. The device operates within a junction temperature range of -55°C to +150°C and features a minimum DC current gain (hFE) of 67.
Feature Summary
- NPN silicon construction optimized for low-voltage amplification
- Through-hole TO-92 packaging for standard board mounting
- High thermal stability with extended operating temperature range
Applications
- General-purpose audio amplification stages
- Low-voltage switching circuits
- Signal processing pre-amplifiers
Procurement Notes
Verify the specific suffix D74Z against official datasheets to confirm pinout orientation and marking codes. Ensure compatibility with existing PCB footprints for TO-92 packages. Confirm RoHS compliance status if required by project specifications. Cross-reference part numbers with authorized distributors to avoid counterfeit components.
Selection Notes
Select this component when a low-cost NPN transistor with moderate current handling is required. Compare hFE ranges and voltage ratings against circuit requirements. Consider thermal management needs given the plastic package limitations. Verify availability of direct replacements if supply chain constraints exist.
Part Context
This part belongs to onsemi's discrete semiconductor portfolio, specifically the bipolar junction transistor category. It serves as a fundamental active component in analog and digital logic interfaces. The TO-92 form factor ensures broad compatibility with legacy and modern through-hole designs.
Replacement Considerations
Direct substitutes may include other NPN transistors from Fairchild or onsemi with identical voltage and current ratings. Verify pinout compatibility before substitution. Alternative packages such as SOT-23 require adapter considerations.
