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2SC3356 R25 SOT-23 NPN RF Transistor 20V 100mA 7GHz fT (10-Pack)
2SC3356 R25 SOT-23 NPN RF Transistor 20V 100mA 7GHz fT (10-Pack)
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2SC3356 R25 SOT-23 NPN RF Transistor — 7GHz fT, UHF/VHF Amplifier (10-Pack)
The 2SC3356 (marking: R25) is a high-frequency NPN silicon RF transistor from ROHM in a SOT-23 surface-mount package. With a transition frequency of 7GHz and a noise figure of just 2dB at 1GHz, it is the standard transistor for UHF/VHF low-noise amplifiers (LNA), satellite receiver front-ends, and high-frequency oscillator circuits.
Key Specifications
| Parameter | Value |
|---|---|
| Part Number | 2SC3356 (R25) |
| Package | SOT-23 (SMD) |
| Type | NPN Silicon RF Transistor |
| VCEO (Collector-Emitter Voltage) | 20V |
| IC (Collector Current) | 100mA |
| PC (Power Dissipation) | 200mW @ 25°C |
| fT (Transition Frequency) | 7GHz typical |
| hFE (DC Current Gain) | 40–120 @ IC=10mA |
| Noise Figure (NF) | 2dB @ 1GHz, VCE=3V, IC=5mA |
| Operating Temperature | −55°C to +125°C |
| Quantity | 10 pieces |
Why Choose 2SC3356?
- 7GHz Transition Frequency — Provides useful gain well into the UHF band (300MHz–3GHz)
- 2dB Noise Figure @ 1GHz — Low-noise performance for LNA and satellite receiver front-ends
- SOT-23 Package — Compact SMD footprint for RF PCB designs with short trace lengths
- 20V VCEO — Adequate headroom for typical RF amplifier bias voltages
- Industry Standard — Widely used in consumer electronics RF circuits; extensive reference designs available
Typical Applications
- UHF/VHF low-noise amplifier (LNA) for TV tuners and SDR dongles
- Satellite receiver (LNB) front-end amplifier
- FM/AM radio RF amplifier stage
- High-frequency oscillator (Colpitts, Hartley) up to 1GHz
- Wideband RF buffer amplifier
- Cellular and WiFi band pre-amplifier
Typical Bias Point (LNA)
VCE = 3V, IC = 5mA for minimum noise figure. Use common-emitter topology with 50Ω input/output matching network. Add bypass capacitors (100pF + 10nF) on VCC supply line to prevent RF feedback.
FAQ
Q: What does the “R25” marking mean on 2SC3356?
A: “R25” is the SOT-23 date/lot code marking for 2SC3356. The full part number is 2SC3356-R25 (ROHM designation).
Q: Can 2SC3356 amplify 2.4GHz WiFi signals?
A: With fT=7GHz, it has gain at 2.4GHz but performance degrades above 1GHz. For 2.4GHz LNA, use dedicated MMIC amplifiers (e.g., SPF5189Z, BGA2803).
Package Contents
- 10× 2SC3356 R25 SOT-23 NPN RF Transistor
