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 is the better bench power supply overall, rated 3.4 to 2.5. The Siglent SPD3303C leads on warranty, PC control and resolution. The Tekpower TP3003D-3 wins on value and protection & features. The Tekpower TP3003D-3 costs $164.01 less ($179.99 vs $344).
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.
Tekpower TP3003D-3
#7 in Multi-outputFull review
The cheapest way to get three linear rails on a hobby bench, if PC control is not needed.
Amazon $179.99$179.99
Which should you buy?
- Choose the Siglent SPD3303C for warranty (3-year warranty vs 1-year warranty), PC control (USB with SCPI vs no PC interface) and resolution (10 mV / 10 mA setting resolution vs 100 mV / 10 mA readback resolution).
- Choose the Tekpower TP3003D-3 for value ($0.92 per watt ($179.99, 195 W from the channel ratings) vs $1.56 per watt ($344, 220 W rated)) and protection & features (over-current protection vs stored setups).
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 SPD3303C | Tekpower TP3003D-3 |
|---|---|---|
| Overall rating | 3.4/5 | 2.5/5 |
| Value 25% | 33 $1.56 per watt ($344, 220 W rated) | 48 $0.92 per watt ($179.99, 195 W from the channel ratings) |
| Output quality 20% | 71 1 mVrms ripple and noise | 71 1 mVrms ripple and noise |
| Resolution 15% | 25 10 mV / 10 mA setting resolution | 0 100 mV / 10 mA readback resolution |
| PC control 15% | 80 USB with SCPI | 0 no PC interface |
| Protection & features 10% | 20 stored setups | 30 over-current protection |
| Warranty 15% | 100 3-year warranty | 0 1-year warranty |
Specifications
| Siglent SPD3303C | Tekpower TP3003D-3 | |
|---|---|---|
| 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, 5 V/3 A |
| Max voltage | 32 V | 30 V |
| Max current | 3.2 A | 3 A |
| Rated power | 220 W | 195 W (channels added) |
| Ripple and noise | 1 mVrms | 1 mVrms / 20 mVp-p |
| Precision | ||
| Setting resolution | 10 mV / 10 mA | - |
| Readback resolution | 10 mV / 10 mA | 100 mV / 10 mA |
| Control | ||
| PC interfaces | USB | None |
| SCPI | Yes | - |
| Stored setups | 5 | - |
| Over-current protection | - | Yes |
| Build | ||
| Weight | 16.5 lb | 28 lb |
| Warranty | 3 years | 1 year |