Key Selection Information
| Selection Parameter | Confirmed Information |
|---|---|
| Switch type | Reflective SPDT RF switch |
| Frequency range | DC to 3 GHz |
| Isolation | 50 dB headline specification |
| Control | Positive control from 0/+3 V to 0/+7 V |
| Off-state RF ports | Reflective open |
| Logic compatibility | CMOS and most TTL families |
| Package | 8-lead MSOP |
| Family guidance | Recommended for new designs |
Product Overview
The HMC194AMS8ETR is the tape-and-reel 8-lead MSOP version of Analog Devices’ HMC194A high-isolation SPDT RF switch. It controls signals from DC to 3 GHz and is optimized for applications that need strong separation between two selectable RF paths.
Its defining system behavior is reflective switching: RF1 and RF2 are open when turned off rather than internally matched to 50 Ω. Analog Devices highlights 50 dB isolation and positive-voltage control compatible with CMOS and most TTL logic families. These traits make the part materially different from absorptive SPDT switches even when the operating band overlaps.
Technical Specifications
| Parameter | Confirmed Information |
|---|---|
| Topology | SPDT |
| Off-state behavior | Reflective open |
| Frequency range | DC to 3 GHz |
| Isolation | 50 dB headline specification |
| Positive control range | 0/+3 V to 0/+7 V |
| Control compatibility | CMOS and most TTL logic families |
| Package | 8-lead MSOP |
| Order form | Tape and reel |
| Family design guidance | Recommended for new designs |
Design Considerations
Reflective off-state ports can interact with filters, amplifiers and resonant networks differently from a terminated switch. Check source and load stability in both switch states rather than assuming the high isolation figure also implies a matched inactive port.
The positive-control operating range gives flexibility in logic interfacing, but the selected control voltage must still meet the exact switching-state thresholds and timing conditions in the datasheet. Preserve the MSOP footprint and RF grounding arrangement when comparing replacements.
Related Engineering Resources
Quality & Verification Support
Third-party inspection or testing can be arranged according to customer requirements. Testing fees are borne by the buyer. Additional verification requirements can be discussed before shipment. After an order is placed, physical product, label, packaging, and Date Code photos may be provided where appropriate.
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