Synergy Tier-1 distributor Jarwey｜SY2322 vs SY2640 probe-housing quiescent density
Jarwey is a Synergy (Xinlijie) Tier-1 distributor for ultrasound HV switches: shortlist, datasheet, samples, and delivery.
Once the switch sits in the probe shell, going from 32 channels to 64 is a housing question. Quiescent power per channel can stay flat while the heat piles into one outline. This note compares only that: SY2322 (32-channel 1:2 MUX, about 5 mW, 9.0×9.0 mm QFN) against SY2640 (64-channel, about 10 mW, 10.0×10.0 mm BGA).
Shift-register blanking time, bleed-versus-clamp, and 32-channel logic levels are other articles. Those tables stay there.
Published idle power is not a junction temperature
The 5 mW and 10 mW figures are typical static dissipation from the public descriptions. They leave out switching loss. Do not treat the integrated 40 kΩ bleed as a resistor parked across ±100 V — it dumps residual charge on a capacitive probe. Continuous current belongs on a +5 V and HV-rail measurement. Outline area is only for power density. Without θJA from the datasheet, do not convert milliwatts into a die temperature. The product page carries the datasheet; if the PDF is missing, ask Jarwey for it.
| Placement | Channels / topology | Typical idle power | Outline | Density | Per channel | Logic |
|---|---|---|---|---|---|---|
| SY2322 ×1 | 32-ch 1:2 MUX | ~5 mW | 9.0×9.0 mm = 81 mm² | 5 / 81 ≈ 0.062 mW/mm² | 5 / 32 ≈ 0.16 mW | 1.8–5 V CMOS; 50 MHz shift clock; thermal shutdown |
| SY2640 ×1 | 64-ch; family table lists 2:1 MUX | ~10 mW | 10.0×10.0 mm = 100 mm² | 10 / 100 = 0.10 mW/mm² | 10 / 64 ≈ 0.16 mW | 3–5 V CMOS; 50 MHz shift clock; thermal shutdown |
| SY2322 ×2 | 64-ch as two 1:2 MUXes | ~10 mW total | 162 mm² | 10 / 162 ≈ 0.062 mW/mm² | still ~0.16 mW | two shift chains; still 1.8–5 V |
Idle power per channel matches, about 0.16 mW. The housing does not. One SY2640 runs about 0.10 / 0.062 ≈ 1.6× the static density of one SY2322, while the outline only grows from 81 mm² to 100 mm² and the channel count doubles. Two SY2322 devices dissipate the same ~10 mW as one SY2640, split across two spots and about 162 mm².
Both descriptions list roughly 0 V to ±100 V and an integrated ~40 kΩ bleed. Confirm topology on the channel diagram: SY2322 is specified as a 1:2 MUX; the family table tags SY2640 as a 2:1 MUX. An SPST aperture does not belong in this milliwatt comparison.
Which part enters the shell first
If the nose has room for one ~10×10 mm body and the FPGA I/O is 3.3 V or 5 V, start with SY2640 and budget the higher density. Measure supply current and read θJA before anyone quotes a junction temperature from 10 mW.
If the only logic rail is 1.8 V, or the shell prefers two cooler spots and can host two shift chains, stay with SY2322. The 1.8 V 64-channel package split is SY2642, covered separately.
Seven checks before layout freeze
- Is the aperture a 1:2 or 2:1 MUX? SPST belongs on SY2325 / SY2326, not on this table.
- Measure +5 V idle current at the real logic voltage and shell ambient. Treat ~5 mW and ~10 mW as typical, not as a maximum.
- Keep transmit switching loss and HV-rail current in their own column. Do not price the 40 kΩ bleed as a continuous ±100 V load.
- One SY2640 is about 1.6× the static density of one SY2322. Does the probe’s heat path cover that single spot?
- Two SY2322 devices for 64 channels still total ~10 mW, over ~162 mm², with two heat spots and two shift chains.
- Is the FPGA at 1.8 V or at 3.3 V / 5 V? SY2640 logic is 3–5 V. A 1.8 V rail is a reason to leave it off the first shortlist.
- Both parts include thermal shutdown. That is not a thermal model. No θJA, no junction-temperature claim. Ask Jarwey if the datasheet is not on the product page.
Related notes
Product pages
Samples and small lots can ship with the datasheet. Send the incumbent HV-switch part number and the free outline inside the probe; Jarwey returns a candidate list by channel count, logic voltage, and thermal spot. That is an evaluation path, not an unverified drop-in.
Jarwey · Synergy Tier-1 distributor · kerry.w@jarwey.cn · Contact.
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