Siglent SMM3311X SMU Single Channel Source Measure Unit | 210V 3A 10.5A Pulse
Siglent SMM3311X SMU Single Channel Source Measure Unit is a Precision 4‑quadrant SMU with 10 fA/100 nV resolution, ±210 V, ±3.03 A DC and ±10.5 A pulse, touchscreen UI, SCPI, USB & LAN control.
SMM3311X — single-channel precision SMU
The SMM3311X is a single-channel four-quadrant Source Measure Unit: it sources voltage or current and measures voltage, current and resistance at the same time, down to 100 nV and 10 fA. One instrument replaces the supply, the DMM and the electrometer a characterisation bench would otherwise need.
Four-quadrant operation means it sources and sinks, so the same terminals that drive a device can also load it. Add 6½-digit readings at up to 100,000 per second, pulses down to 50 µs, linear and logarithmic sweeps, list sequencing from 10 µs, and a 5″ touchscreen that plots the curve as it is measured.
What an SMU does that a supply and a meter cannot
Sourcing and measuring in the same instrument, at resolutions that reach into the femtoamps.
High-precision pulse emulation
Pulsed output to ±10.5 A with a minimum width of 50 µs. Short pulses put energy into the device without letting it heat up, which is the only honest way to measure on-resistance and switching behaviour on GaN and SiC power devices — a DC measurement would be reading the temperature rise as much as the device.
Linear & logarithmic sweep
Step voltage or current point by point and log every reading automatically — the direct route to a full I-V curve. Logarithmic sweeps concentrate points where the interesting behaviour is, which matters for diodes, solar cells and anything with an exponential region.
Flexible custom sequencing
List mode runs linear, non-linear or entirely arbitrary point sequences with a minimum interval of 10 µs — so a test profile can be defined once and replayed identically every run.
Data visualisation & analysis
Graph, roll and measurement-results views plot the curve in real time on the 5″ touchscreen and summarise the statistics — you see the result at the bench, not after exporting it.
Efficient programmable control
SCPI over USB or LAN, plus an embedded web server and a TCP/IP socket interface. 100 k points of timestamped internal storage mean the unit can run a sequence standalone and hand back the data afterwards.
Key features
- Single-channel four-quadrant SMU — sources and sinks, so it can drive and load the same device
- ±210 V and ±3.03 A DC (±10.5 A pulsed), 31.8 W per channel
- Resolution down to 100 nV and 10 fA — measurements an ordinary DMM cannot make
- Voltage accuracy 0.015% + 225 µV · current accuracy 0.1% + 100 pA
- 6½ digits (2,100,000 count) at up to 100,000 readings/s
- Minimum pulse width 50 µs — characterise GaN and SiC without self-heating
- Linear and logarithmic sweeps · list mode down to a 10 µs interval
- 100 k points of timestamped internal storage · graph, roll and results views on a 5″ touchscreen
- Guarded triaxial force/sense connections for genuine low-current work
- USB, LAN with embedded web server, SCPI and TCP/IP socket · USB-GPIB optional
Application examples
Semiconductor device characterisation
Sweep gate and drain, capture the full I-V family and read gate leakage in the femtoamp range — the four-quadrant output sources and sinks, so the device can be driven and loaded from the same terminals.
GaN and SiC power devices
±10.5 A pulses as short as 50 µs let you characterise on-resistance and switching behaviour without self-heating distorting the result — the measurement that DC-only instruments simply cannot make.
Nano-scale devices and materials
10 fA resolution with a guarded triaxial front end measures leakage and high-impedance materials where an ordinary DMM is blind.
Solar cells and LEDs
Linear or logarithmic sweeps plot the full I-V curve point by point with automatic logging, giving you Voc, Isc and the knee in a single run.
Automated production test
SCPI over USB or LAN, a built-in web server and 100 k points of timestamped internal storage — the unit can run a list sequence standalone and hand back the results.
Every angle
The SMM3311X up close — note the guarded triaxial force and sense terminals.
Specifications
| Channels | 1 channel — four-quadrant source and sink |
| Source voltage | ±210 V · programming resolution 100 nV |
| Source current | ±3.03 A DC · ±10.5 A pulsed · resolution down to 10 fA |
| Power per channel | 31.8 W |
| Functions | Source voltage or current · measure voltage, current and resistance |
| Voltage accuracy | 0.015% of reading + 225 µV |
| Current accuracy | 0.1% of reading + 100 pA |
| Display digits | 6½ digits (2,100,000 count) |
| Acquisition rate | Up to 100,000 readings/s · sampling interval from 0.0005 PLC, up to 100 PLC |
| Pulse | Minimum programmable pulse width 50 µs |
| Sweep & list | Linear and logarithmic sweep · list mode with 10 µs minimum interval · arbitrary point sequences |
| Internal storage | 100,000 points with timestamps |
| Display | 5″ capacitive touchscreen — graph, roll and measurement-results views |
| Connections | Triaxial force and sense terminals with guard |
| Connectivity | USB · LAN with embedded web server · SCPI · TCP/IP socket · GPIB via the optional USB-GPIB adapter |
From the official SMM3000X series data sheet (EN02A); subject to change, errors & omissions excepted.
In the box
Standard configuration for the SMM3311X.
To connect to the triaxial force/sense terminals, add one of the banana-to-triaxial adapters below — the guarded versions are what enable genuine low-current measurement.
Adapters & accessories
The optional accessories Siglent lists for the SMM3000X series.
Banana-to-triaxial 4-wire (Kelvin) adapter — the one to use for low-resistance and low-level measurements where lead resistance would otherwise dominate.
Banana-to-triaxial 2-wire adapter with guard — keeps the guard shield intact, which is what makes femtoamp measurements possible.
Banana-to-triaxial 2-wire adapter without guard — the economical choice for general sourcing and measurement.
Adds GPIB alongside the standard USB and LAN interfaces, for racks built around a GPIB controller.
Which adapter do I need?
Use STC6P4W for 4-wire (Kelvin) measurements where lead resistance matters, STC6P2W when you need 2-wire with the guard for low-current work, and STC6P2W-B for straightforward 2-wire sourcing. The adapter data sheet is in the downloads below.
The dual-channel version — two independent SMU channels for three-terminal device characterisation without re-cabling.
One channel or two?
If you characterise three-terminal devices, the dual-channel SMM3312X saves you re-cabling on every sweep. Tell us what you measure and we will advise — including which triaxial adapter fits your fixture.