Siglent SPD3303X Linear DC 3CH programmable power supply
The Siglent SPD3303X is a high-performance, programmable DC power supply with a resolution of 1 mV for voltage and 1 mA for current, offering precise control for a wide range of test and development tasks. It provides three independent outputs (two adjustable up to 32 V / 3 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 SPD3303X also features advanced protection against overloads and short circuits, ensuring safe and reliable operation.
SPD3303X — 3-channel 220 W linear power supply
The SPD3303X is the precision model of the three-channel family: two adjustable 0–32 V / 3.2 A linear outputs plus a fixed 2.5 / 3.3 / 5 V logic rail (220 W total), set and read back at 1 mV / 1 mA with ±(0.03% + 10 mV) voltage accuracy — ten times finer than its siblings, on a 4.3" colour TFT with 5-digit readout and a real-time waveform view.
The two main channels combine at a button press: series for up to 60 V, parallel for up to 6.4 A, or symmetric ± rails for analog work — the outputs are fully isolated. The on-screen timer runs five groups of timed voltage/current settings standalone, five memories store complete setups, and SCPI over USB or LAN plus the free EasyPower software and a LabVIEW driver make it a first-class citizen in automated test.
Every angle
The SPD3303X up close — note the USB and LAN ports standard on the rear.
One supply, three rails — and two channels that team up
Isolated outputs, series and parallel modes, and a timer that works without a PC.
A five-step timer you can watch run
Program five groups of voltage, current and duration per channel and the supply executes them standalone — power-cycle endurance, staged start-up rails, brown-out simulation. The 4.3" TFT draws the sequence as a live waveform while the table counts down each step, so you see the profile happen instead of trusting it did. EasyPower extends the same idea on the PC with longer sequences and logging.
Series to 60 V, parallel to 6.4 A
The two 32 V channels combine at a button press: series stacks them into one 0–60 V output for PoE, telecom and 48 V industrial work, parallel ties them behind one pair of terminals for 6.4 A — the supply handles master–slave tracking in both cases. And because the outputs are isolated, a grounded midpoint in series mode gives clean symmetric ± rails for analog work.
Parallel: current that shares itself
In parallel mode the master channel sets the voltage and the slave shares the load automatically — up to 6.4 A of linear-regulated current with the same ≤ 1 mVrms ripple as a single channel.
USB & LAN standard — automation ready
Both interfaces ship on every unit: script the supply with SCPI from any environment, use the free LabVIEW driver, drive sequences from EasyPower, or drop it into a LAN-connected rack — no options, no adapters. The rear AC selector switches between 100, 120, 220 and 230 V, so the same instrument travels between labs and grids.
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
- 4.3" colour TFT (480×272) — 5-digit voltage / 4-digit current, real-time waveform view
- 1 mV / 1 mA setting resolution · voltage accuracy ± (0.03% of reading + 10 mV)
- 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 & LAN with SCPI, free EasyPower software and a LabVIEW driver
Application examples
Millivolt-level margin testing
Step a rail in 1 mV increments to find the exact brown-out point of an MCU or the dropout of a regulator — with ±(0.03% + 10 mV) accuracy, the number on the display is the number at the board.
Current profiling with 4-digit readback
Watch a design's supply current settle at milliamp resolution on the 5-digit display, and let the real-time waveform view draw start-up inrush and mode changes as they happen — often enough to skip a shunt-and-scope setup.
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 at precisely set voltages — each output isolated, each with its own current limit.
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 — set to the millivolt on both rails.
Automated characterisation
SCPI over USB or LAN with the LabVIEW driver: sweep supply voltage across the tolerance band, log readback current at every point, and repeat the run identically next week — EasyPower covers it without writing code.
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 | 4.3" colour TFT (480×272) — 5-digit voltage / 4-digit current, real-time waveform view |
| Setting resolution | 1 mV / 1 mA |
| Accuracy (program & readback) | Voltage ± (0.03% of reading + 10 mV) · Current ± (0.3% of reading + 10 mA) |
| 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 · LAN · SCPI · LabVIEW driver |
| AC input | 100 / 120 / 220 / 230 V ±10%, 50/60 Hz — rear selector |
| Dimensions & weight | 225 × 143 × 278 mm · ≈ 8 kg |
From the official SPD3000X series datasheet; subject to change, errors & omissions excepted.
In the box
Everything included as standard with your SPD3303X. Output test leads are not included — most users pair it with their preferred banana leads.
Accessories & related
The same 3-channel platform at other price points — the X-E with 10 mV / 10 mA, the C with an LED display.
The same TFT, timer, waveform view and LAN at 10 mV / 10 mA resolution — save €129 where millivolt steps aren't needed.
The value model: identical outputs and modes with an LED display and USB only, for €260 less.
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.