Siglent SPD3303C 220W 3CH programmable power supply
The Siglent SPD3303C is a high-performance, programmable DC power supply with a resolution of 10 mV for voltage and 10 mA for current, offering precise and stable control for a wide range of test and development tasks. It provides three independent outputs (two adjustable up to 32 V / 3.2 A and one fixed 2.5 V / 3.3 V / 5 V), delivering a total output power of 220 W. Designed for laboratories, R&D, and educational applications, the SPD3303C also features advanced protection against overloads and short circuits, ensuring safe and reliable operation
SPD3303C — 3-channel 220 W linear power supply
The SPD3303C puts three isolated linear outputs on the bench for the price of a good single-channel supply: two adjustable 0–32 V / 3.2 A channels plus a fixed 2.5 / 3.3 / 5 V logic rail, 220 W in total — enough to power an entire prototype from one box, each rail with its own hard current limit.
The two main channels combine at a button press: series for up to 60 V, parallel for up to 6.4 A, or wire them as symmetric ± rails for op-amp work — the outputs are fully isolated, so the topology is yours to choose. Bright LED meters show voltage and current on both channels at once, the panel timer sequences five groups of timed settings without a PC, five memories store complete setups, and USB with SCPI plus the free EasyPower software covers remote control.
Every angle
The SPD3303C up close — with the accessory set included in the box.
One supply, three rails — and two channels that team up
Isolated outputs, series and parallel modes, and a timer that works without a PC.
Series mode: 60 V from a button press
Select series and the two 32 V channels stack into one 0–60 V output — the supply handles the master–slave tracking, you just wire across the outer terminals as shown. PoE and telecom rails, 48 V industrial electronics with tolerance headroom, or symmetric ± rails when you ground the midpoint: the isolated outputs make all of it a wiring choice, not a second instrument.
Parallel mode: one 6.4 A output
Parallel mode ties both channels behind a single pair of terminals for up to 6.4 A of linear-regulated current — the master channel sets voltage and the slave shares the load automatically. Motors, heaters, LED arrays and charging tests get the current they need with the same ≤ 1 mVrms ripple and ≤ 0.01% + 3 mV load regulation as a single channel.
LED meters you read across the lab
Four-digit voltage and three-digit current glow for both channels simultaneously — no menus, no squinting. Real knobs and keys set values fast, the lock key freezes the panel against accidental changes, and CV/CC indicators show each channel's state at a glance.
Timer, memories & EasyPower
The panel timer steps through five groups of timed voltage/current settings without a PC — power-cycling, staged start-ups, endurance runs. Five memories store complete setups, and the free EasyPower software adds PC-side control and sequencing over USB with SCPI.
Key features
- Three isolated outputs — 2 × 0–32 V / 3.2 A adjustable plus a fixed 2.5 / 3.3 / 5 V logic rail, 220 W total
- Independent, series and parallel modes — up to 60 V or 6.4 A at a button press
- LED display — 4-digit voltage / 3-digit current per channel
- 10 mV / 10 mA setting resolution · voltage accuracy ± (0.5% of reading + 2 digits)
- Linear regulation: ripple & noise ≤ 1 mVrms (5 Hz – 1 MHz), transient recovery < 50 µs
- Short-circuit and overload protected outputs on all three channels
- Panel timing output — 5 groups of timed V/I settings run without a PC
- 5 setup memories with external storage expansion · key lock · intelligent temperature-controlled fan
- USB with SCPI and the free EasyPower PC software
Application examples
Powering multi-rail prototypes
One box powers the whole board: the fixed channel holds the 3.3 V or 5 V logic rail while the two adjustable channels feed analog stages, motor drivers or radio modules — each output isolated, each with its own current limit, all switched on together or one at a time.
Symmetric supplies for op-amp circuits
Because the channels are isolated, wiring them in series with a grounded midpoint gives clean ±15 V (or any symmetric pair up to ±32 V) for amplifier and filter work — with channel tracking keeping both rails matched.
Education and training labs
Bright LED meters readable from across the room, real knobs and keys, a lock button, hard current limits and five recallable setups make it a supply students can use all day without breaking boards — or the supply.
48 V and high-current jobs
Series mode reaches 60 V for PoE, telecom and industrial 48 V rails with headroom; parallel mode delivers 6.4 A from a single pair of terminals for heaters, motors and charging tests.
Repair and service benches
Three rails cover most boards that arrive at the bench, the timer power-cycles a repair overnight, and stored setups bring back the exact test condition for repeat jobs — all controlled over USB when a script is faster.
Specifications
| Outputs | CH1 & CH2: 0 – 32 V / 0 – 3.2 A each · CH3 fixed: 2.5 / 3.3 / 5 V at 3.2 A (±8%) · 220 W total |
| Output modes | Independent · Series (up to 60 V) · Parallel (up to 6.4 A) — channels individually or all-on/all-off switchable |
| Display | LED display — 4-digit voltage / 3-digit current per channel |
| Setting resolution | 10 mV / 10 mA |
| Accuracy (program & readback) | Voltage ± (0.5% of reading + 2 digits) · Current ± (0.5% of reading + 2 digits) |
| Constant voltage mode | Line/load regulation ≤ 0.01% + 3 mV · ripple & noise ≤ 1 mVrms (5 Hz – 1 MHz) · recovery < 50 µs |
| Constant current mode | Line/load regulation ≤ 0.2% + 3 mA · ripple & noise ≤ 3 mArms |
| Protection | Short-circuit and overload protected outputs · intelligent temperature-controlled fan |
| Timer | Panel timing output — 5 groups of timed V/I settings · PC timer via EasyPower |
| Memories | 5 internal setup stores (save / recall) · external storage expansion · front-panel key lock |
| Connectivity | USB Device · SCPI |
| AC input | 100 / 120 / 220 / 230 V ±10%, 50/60 Hz — rear selector |
| Dimensions & weight | 275 × 225 × 136 mm · 7.5 kg |
From the official SPD3000C series datasheet; subject to change, errors & omissions excepted.
In the box
Everything included as standard with your SPD3303C. Output test leads are not included — most users pair it with their preferred banana leads.
Accessories & related
Want a colour display or network control? The X models add a 4.3" TFT with waveform view and LAN.
Adds a 4.3" colour TFT with real-time waveform view plus LAN networking — the connected-lab upgrade.
The precision model: 1 mV / 1 mA resolution, ±(0.03% + 10 mV) accuracy, 5-digit readout, TFT and LAN.
SPD3000X-RMK — 19″ kit (4U) that fits every SPD3000-series supply, for test racks and production lines.
Leads, adapters, cases and more for your Siglent bench.
Compare the full power-supply range
Linear and switching, one to three channels, 128 W to kilowatts — or ask us to match a supply to your application.
Downloads
Automating this supply? Our application notes cover SCPI programming, remote-control setup and measurement recipes.