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FSA839UCX
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Product Detailed Parameters
- Description：IC SWITCH SPDTX1 750MOHM 6WLCSP
- Series：-
- Mfr：Fairchild Semiconductor
- Package：Bulk
- Switch Circuit：SPDT
- Multiplexer/Demultiplexer Circuit：2:01
- On-State Resistance (Max)：750mOhm
- Channel-to-Channel Matching (ΔRon)：-
- Voltage - Supply, Single (V+)：1.65V ~ 5.5V
- Voltage - Supply, Dual (V±)：-
- Switch Time (Ton, Toff) (Max)：25ns, 20ns
- -3db Bandwidth：60MHz
- Charge Injection：70pC
- Channel Capacitance (CS(off), CD(off))：50pF
- Current - Leakage (IS(off)) (Max)：10nA
- Crosstalk：-55dB @ 1MHz
- Operating Temperature：-40°C ~ 85°C (TA)
- Mounting Type：Surface Mount
- Package / Case：6-UFBGA, WLCSP
- Supplier Device Package：6-WLCSP (1.23x0.88)
- Number of Circuits：1
- Grade：-
- Qualification：-
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Overview
The FSA839UCX is a high-performance Single-Pole Double-Throw (SPDT) analog switch designed for audio applications. It operates within a wide supply voltage range of 1.65 V to 5.5 V and features an ultra-low on-resistance of 0.8 Ω maximum at 4.5 V VCC. The device utilizes a 6-WLCSP package with dimensions of 1.23 mm x 0.88 mm. It supports low-voltage baseband signals, including 1.8 V operation, making it suitable for portable electronics requiring minimal signal distortion.
Feature Summary
- Ultra-low on-resistance ensures minimal signal attenuation in audio paths
- Wide supply voltage range supports diverse low-power system architectures
- Compact WLCSP footprint optimizes board space in mobile devices
Applications
- Audio path switching in smartphones and tablets
- Headset jack detection circuits
- Microphone input selection in portable media players
Procurement Notes
Verify the manufacturer origin as Fairchild Semiconductor or acquired entities like onsemi. Confirm the specific suffix UCX denotes the 6-WLCSP package variant. Ensure compliance with RoHS standards if required by the target market regulations. Cross-reference the datasheet revision date to confirm current production status.
Selection Notes
Select this component when low on-resistance is critical for maintaining audio fidelity in SPDT switching scenarios. The wide voltage compatibility allows integration into systems ranging from 1.65 V to 5.5 V. Consider the small package size for dense PCB layouts in consumer electronics where space is constrained.
Part Context
This part belongs to the FSA series of analog switches, which are optimized for multimedia and audio applications. The series typically includes variants with different pin counts and resistance profiles. The FSA839 specifically targets single-channel switching needs with emphasis on low distortion and fast switching times for digital audio interfaces.
Replacement Considerations
Check for direct substitutes within the same family such as FSA839LUCX if lead time variations exist. Verify pinout compatibility before substituting with other SPDT switches from different manufacturers. Ensure the alternative component meets the same 0.8 Ω maximum on-resistance specification.
