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HMC542BLP4ETR broadband
The HMC542BLP4ETR is a broadband SPDT GaAs switch offering DC–8 GHz operation, low loss, and high isolation for advanced RF and microwave applications.
HMC542BLP4ETR – Broadband SPDT Switch
The HMC542BLP4ETR is a high-performance broadband single-pole double-throw (SPDT) switch designed by Analog Devices (formerly Hittite Microwave). It offers excellent isolation, low insertion loss, and fast switching speed across a broad frequency range from DC to 8 GHz, making it ideal for RF, microwave, and high-frequency communication systems.
Built using GaAs pHEMT technology, this switch ensures superior linearity, low power consumption, and high reliability in compact surface-mount packaging. The HMC542BLP4ETR operates with positive control logic and can handle both small-signal and moderate power levels, suitable for signal routing, transmit/receive switching, and test instrumentation.
Key Features:
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Broadband frequency range: DC to 8 GHz
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Low insertion loss: typically < 1.5 dB
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High isolation: up to 50 dB at 4 GHz
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Fast switching speed: < 6 ns
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High linearity: +50 dBm input IP3 (typical)
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Single positive control voltage (0/5V logic)
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Compact 4×4 mm LFCSP package
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50 Ω matched design for easy integration
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RoHS compliant and lead-free

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Text to Speech TTL Module (Serial to Speech)
- Single row 0.1″ header for easy connection to a host system
- Power requirements: +5 VDC
- 30 mA idle
- 46-220 mA active (depending on speech parameters and output load)
- Communication: Asynchronous 9600 bps serial (8N1)
- Dimensions: 1.25″x1.5″x0.37″
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Text support rate is better
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Interface operation is simpler
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5V single power supply.
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Output directly connected to the speaker, can drive 4 ohms 3W / 8 ohm 2W speakers
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Busy status output, can be connected to the microcontroller IO or indicator light, no need to be left floating.
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Voice effect optimization
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Module miniaturization and easy integration
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Dimension: 33*27.5mm
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With mounting holes

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