Siglent SPD3303X-E
#3 in Multi-outputFull review
A quiet triple-output linear supply for electronics labs that power analog and logic rails at once.
Amazon $459$459
The Siglent SPD3303X-E is the better bench power supply overall, rated 3.6 to 2.4. The Siglent SPD3303X-E leads on PC control, output quality and value. The Siglent SPD3303X-E costs $260 less ($459 vs $719).
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.
GW Instek GPD-3303D
#8 in Multi-outputFull review
A triple-output linear supply from a lab brand, outclassed here on price and setting resolution.
Amazon $719$719
Which should you buy?
- Choose the Siglent SPD3303X-E for PC control (USB, LAN with SCPI vs USB), output quality (0.3 mVrms ripple and noise vs 1 mVrms ripple and noise) and value ($2.09 per watt ($459, 220 W rated) vs $3.69 per watt ($719, 195 W rated)).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every multi-output bench power supply; a clear win is highlighted. How we rank explains each one.
| Factor weight | Siglent SPD3303X-E | GW Instek GPD-3303D |
|---|---|---|
| Overall rating | 3.6/5 | 2.4/5 |
| Value 25% | 25 $2.09 per watt ($459, 220 W rated) | 9 $3.69 per watt ($719, 195 W rated) |
| Output quality 20% | 96 0.3 mVrms ripple and noise | 71 1 mVrms ripple and noise |
| Resolution 15% | 25 10 mV / 10 mA setting resolution | 0 100 mV / 10 mA setting resolution |
| PC control 15% | 100 USB, LAN with SCPI | 50 USB |
| Protection & features 10% | 20 stored setups | 20 stored setups |
| Warranty 15% | 100 3-year warranty | 0 warranty not published, scored as none |
Specifications
| Siglent SPD3303X-E | GW Instek GPD-3303D | |
|---|---|---|
| Output | ||
| Type | Power supply | Power supply |
| Regulation | Linear | Linear |
| Channels | 3 | 3 |
| Channel ratings | 32 V/3.2 A, 32 V/3.2 A, 2.5/3.3/5 V/3.2 A | 30 V/3 A, 30 V/3 A, 2.5/3.3/5 V/3 A |
| Max voltage | 32 V | 30 V |
| Max current | 3.2 A | 3 A |
| Rated power | 220 W | 195 W |
| Ripple and noise | 0.3 mVrms | 1 mVrms |
| Precision | ||
| Setting resolution | 10 mV / 10 mA | 100 mV / 10 mA |
| Readback resolution | 10 mV / 10 mA | 100 mV / 10 mA |
| Control | ||
| PC interfaces | USB, LAN | USB |
| SCPI | Yes | - |
| Stored setups | 5 | 4 |
| Build | ||
| Weight | 17.6 lb | 15.4 lb |
| Warranty | 3 years | - |