Siglent SPD3303C
#5 in Multi-outputFull review
The lower-cost triple-output Siglent, for benches that want three linear rails and USB control.
Amazon $344$344
The Siglent SPD3303C rates 3.4 among multi-output bench power supplys; the B&K Precision 1687B rates 3.1 among single output ones. The Siglent SPD3303C costs $64 less ($344 vs $408).
Prices were last checked November 9, 2026. Product prices and availability are accurate as of that date and are subject to change; the price and availability shown on Amazon or the retailer's site at the time of purchase apply. As an Amazon Associate we earn from qualifying purchases.
B&K Precision 1687B
#7 in Single outputFull review
A durable name-brand switching supply for service benches and 24 V equipment, with a warranty the import brands do not offer.
Amazon $408$408
Scores side by side
These two sit in different type classes (multi-output and single output), and each is scored against the reference points for its own class, so a rating says how well each does among its own type peers. How we rank explains each factor.
| Factor weight | Siglent SPD3303C | B&K Precision 1687B |
|---|---|---|
| Overall rating | 3.4/5 | 3.1/5 |
| Value 25% | 33 $1.56 per watt ($344, 220 W rated) | 42 $1.13 per watt ($408, 360 W rated) |
| Output quality 20% | 71 1 mVrms ripple and noise | 33 5 mVrms ripple and noise |
| Resolution 15% | 25 10 mV / 10 mA setting resolution | 50 resolution not published (neutral score used) |
| PC control 15% | 80 USB with SCPI | 50 USB |
| Protection & features 10% | 20 stored setups | 50 over-voltage protection, stored setups |
| Warranty 15% | 100 3-year warranty | 50 2-year warranty |
Specifications
| Siglent SPD3303C | B&K Precision 1687B | |
|---|---|---|
| Output | ||
| Type | Power supply | Power supply |
| Regulation | Linear | Switching |
| Channels | 3 | 1 |
| Channel ratings | 32 V/3.2 A, 32 V/3.2 A, 2.5/3.3/5 V/3.2 A | 1-36 V/10 A |
| Max voltage | 32 V | 36 V |
| Max current | 3.2 A | 10 A |
| Rated power | 220 W | 360 W |
| Ripple and noise | 1 mVrms | 5 mVrms / 50 mVp-p |
| Precision | ||
| Setting resolution | 10 mV / 10 mA | - |
| Readback resolution | 10 mV / 10 mA | - |
| Control | ||
| PC interfaces | USB | USB, analog remote |
| SCPI | Yes | - |
| Stored setups | 5 | 3 |
| Over-voltage protection | - | Yes |
| Build | ||
| Weight | 16.5 lb | 5.2 lb |
| Warranty | 3 years | 2 years |