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FSA1259AK8X
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Product Detailed Parameters
- Description：IC SWITCH SPST-NOX2 850MOHM US8
- Series：-
- Mfr：onsemi
- Package：Tape & Reel (TR),Cut Tape (CT)
- Switch Circuit：SPST - NO
- Multiplexer/Demultiplexer Circuit：1:01
- On-State Resistance (Max)：850mOhm
- Channel-to-Channel Matching (ΔRon)：50mOhm
- Voltage - Supply, Single (V+)：1.65V ~ 5.5V
- Voltage - Supply, Dual (V±)：-
- Switch Time (Ton, Toff) (Max)：7.5ns, 17ns
- -3db Bandwidth：240MHz
- Charge Injection：15pC
- Channel Capacitance (CS(off), CD(off))：21pF
- Current - Leakage (IS(off)) (Max)：10nA
- Crosstalk：-73dB @ 1MHz
- Operating Temperature：-40°C ~ 85°C (TA)
- Mounting Type：Surface Mount
- Package / Case：8-VFSOP (0.091", 2.30mm Width)
- Supplier Device Package：US8
- Number of Circuits：2
- Grade：-
- Qualification：-
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Overview
The FSA1259AK8X is a dual single-pole single-throw (SPST) normally open analog switch manufactured by onsemi. It operates within a supply voltage range of 1.65V to 5.5V and features a maximum on-resistance of 850 milliohms with a channel-to-channel matching of 50 milliohms. The device provides a -3dB bandwidth of 240MHz, charge injection of 15pC, and off-state leakage current of 10nA. Switching times are specified at 7.5ns for turn-on and 17ns for turn-off. It is housed in an 8-VFSOP package and supports an operating temperature range from -40°C to 85°C.
Feature Summary
- Dual SPST configuration with low on-resistance for signal routing
- High bandwidth capability supporting frequencies up to 240MHz
- Low power consumption with minimal off-state leakage current
Applications
- Portable multimedia devices requiring low-voltage signal switching
- Audio and video signal path management in consumer electronics
- Battery-powered equipment utilizing single-supply operation
Procurement Notes
This component has been officially declared obsolete by the manufacturer as of December 15, 2022. Verification of availability should focus on surplus distributors or secondary market sources rather than direct manufacturing channels. Designers must confirm the authenticity of existing stock through authorized supply chain partners to ensure compliance with quality standards.
Selection Notes
Engineers replacing this part should evaluate alternative switches that match the 1.65V to 5.5V supply range and similar on-resistance specifications. The transition requires checking pin compatibility with the US8 package and verifying that the substitute device meets the required 240MHz bandwidth and switching speed parameters for the specific application circuit.
Part Context
The FSA1259AK8X belongs to the FSA1259A series of low-voltage analog switches designed for portable applications. This series emphasizes small form factors and efficient power usage. The specific K8X suffix denotes the 8-VFSOP package variant, distinguishing it from other packaging options within the broader family of dual SPST switches offered by the manufacturer.
Replacement Considerations
Publicly confirmed substitute part numbers include FSA1256AL8X and FSA1256L8X. These alternatives share similar dual SPST configurations but may differ in on-resistance values and package types such as MicroPak-8. Engineers must verify electrical parameter compatibility before implementation.
