SY2320 / SY2322 32-Ch HV Switch: MUX vs SPST Path
When probe channel count moves from 16 to 32, HV analog-switch selection usually hinges on two decisions at once: topology (2:1 MUX vs SPST) and supply architecture (legacy high-voltage rails vs +5V control). Synergy’s 32-channel lineup splits cleanly:
- SY2320FN: 32-ch 2:1 MUX, closer to traditional HV supply practice; evaluate against Microchip HV2901-class parts
- SY2322: 32-ch 2:1 MUX, focused on +5V single-supply logic-side control; evaluate against Hitachi HDL6M06531B-class parts
If you need 32-channel SPST (not MUX), look at SY2325 / SY2326 instead of forcing a MUX device into an SPST architecture. This article focuses on the listed SY2320FN and SY2322 pages so you can shortlist quickly and move to datasheet checks.
First split: MUX or SPST?
2:1 MUX fits architectures that choose one of two HV analog paths—common in channel expansion, shared TX/RX, and array switching.
SPST is closer to independent on/off per channel, with different routing and control semantics. In Synergy’s cross-reference table, SY2320 / SY2322 are 2:1 MUX devices; SY2325 / SY2326 are 32-ch SPST. Lock topology before debating voltage rating or package.
Same 32-ch MUX class: SY2320FN vs SY2322
If the board already uses ~120V HV supply habits and the BOM looks like HV2901, start with SY2320FN.
If you want simpler supplies and +5V logic-side control, prioritize SY2322.
Public product notes for both highlight low charge injection, integrated bleed resistors, and target uses in medical ultrasound, NDT, and piezoelectric drive. Differences sit mainly in supply architecture, signal-voltage class, and package—confirm with the latest datasheets.
| Checkpoint | SY2320FN | SY2322 |
|---|---|---|
| Channels / topology | 32-ch 2:1 MUX | 32-ch 2:1 MUX |
| Supply approach | Multiple HV supply configurations (often mapped to ~120V architectures) | +5V single-supply logic control; no extra ±HV control rails required |
| Signal range (typical class) | ~100V class (confirm in datasheet) | 0V to ±100V; family materials also list higher-voltage mappings |
| Bleed resistors | Integrated on outputs | Integrated ~40kΩ bleed resistors |
| Interface / control | 32-bit shift register + latch | ~50MHz shift clock; 1.8V–5V CMOS logic |
| Package | 64-Lead LGA | 64-pin QFN (9.0×9.0mm, 0.50mm pitch) |
| Import cross-ref (guide) | HV2901 | HDL6M06531B |
Note: Cross-references help shortlisting; they are not drop-in guarantees. Validate voltage rating, Ron, charge injection, timing, and layout before production.
Six questions for a 32-ch MUX shortlist
- Must the topology be 2:1 MUX? If you need SPST, move to SY2325 / SY2326.
- Will you keep a ~120V HV supply habit, or push control to +5V?
- Does the signal voltage class cover transmit peaks for your probe?
- Do charge injection, off-isolation, and bleed resistors meet the receive noise budget?
- Do shift-clock, latch, and power-up timing match the FPGA / sequencer?
- Can LGA64 vs QFN64 pass your assembly, thermal, and creepage rules?
How this fits 16-ch and 64-ch paths
For fewer channels, see the SY2160 / SY2162 16-ch guide. For 64 channels, evaluate SY2640 / SY2642. Full cross-reference:
Synergy HV analog switch alternative overview
Datasheets and inquiry
SY2320FN product page / datasheet · SY2322 product page / datasheet
If you are also scoping the transmit chain, read: Ultrasound front-end: pulser + HV switch pairing.
Summary
Do not pick a 32-channel HV switch by channel count alone. Confirm MUX vs SPST first, then split SY2320FN vs SY2322 by supply architecture, and evaluate HV2901 / HDL6M06531B as second-source or alternative paths. Datasheet previews are available on the Jarwey product pages for pilot builds.
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