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 OWON OEL8511 rates 3.1 among electronic loads ones. The Siglent SPD3303C costs $55 less ($344 vs $399).
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.
OWON OEL8511
A programmable 200 W load for benches that may later gang several units on RS485.
Amazon $399$399
Scores side by side
These two sit in different type classes (multi-output and electronic loads), 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 | OWON OEL8511 |
|---|---|---|
| Overall rating | 3.4/5 | 3.1/5 |
| Value 25% | 33 $1.56 per watt ($344, 220 W rated) | 26 $2 per watt ($399, 200 W rated) |
| Output quality 20% | 71 1 mVrms ripple and noise | 47 5 kHz dynamic mode |
| Resolution 15% | 25 10 mV / 10 mA setting resolution | 75 1 mV / 1 mA setting resolution |
| PC control 15% | 80 USB with SCPI | 80 USB, RS232, RS485 with SCPI |
| Protection & features 10% | 20 stored setups | 60 over-voltage protection, over-current protection |
| Warranty 15% | 100 3-year warranty | 0 warranty not published, scored as none |
Specifications
| Siglent SPD3303C | OWON OEL8511 | |
|---|---|---|
| Output | ||
| Type | Power supply | Electronic load |
| Regulation | Linear | - |
| Channels | 3 | 1 |
| Channel ratings | 32 V/3.2 A, 32 V/3.2 A, 2.5/3.3/5 V/3.2 A | 150 V/20 A, 200 W |
| Max voltage | 32 V | 150 V |
| Max current | 3.2 A | 20 A |
| Rated power | 220 W | 200 W |
| Ripple and noise | 1 mVrms | - |
| Dynamic mode | - | 5 kHz |
| Load modes | - | CC, CV, CR, CP |
| Precision | ||
| Setting resolution | 10 mV / 10 mA | 1 mV / 1 mA |
| Readback resolution | 10 mV / 10 mA | 1 mV / 0.1 mA |
| Control | ||
| PC interfaces | USB | USB, RS232, RS485 |
| SCPI | Yes | Yes |
| Stored setups | 5 | - |
| Over-voltage protection | - | Yes |
| Over-current protection | - | Yes |
| Build | ||
| Weight | 16.5 lb | 9.3 lb |
| Warranty | 3 years | - |