Description
Overview
The UTP3315TFL-II is a single-channel linear bench supply at the size, weight, and price point that makes sense for the bench it's actually going to live on. UNI-T calls it "an economical benchtop tool for DIY electronics hobbyists, electronics manufacturing and testing" — which is the most accurate one-line description we can offer. 150W of linear DC at 0–30V / 0–5A, in a footprint of 105 × 165 × 249 mm and a 4 kg net weight.
A four-digit LED display reads voltage and current at 10 mV / 1 mA resolution per channel. Auto CV/CC crossover with current limit protection handles unknown loads safely. The 5A current rating handles small motors, transmitter front-ends, higher-current LED arrays, and the kind of higher-power prototyping that the 3A UTP3313TFL-II runs short on. No firmware, no network port, no PC software stack.
Key Features
- Single-Channel, 150W Linear Output — 0–30V / 0–5A from a linear regulator. Clean, low-ripple output (≤2 mVrms) suitable for analog work, transmitter projects, motor-drive prototyping, and higher-current bench tasks where switching noise is unwelcome.
- Four-Digit LED Display, 10 mV / 1 mA — High-resolution voltage and current readouts. Set the rail accurately; see what the load is actually drawing.
- Auto CV/CC Crossover with Current Limit Protection — The supply transitions automatically between constant-voltage and constant-current operation when the load steps. Protects the DUT during fault conditions and the supply during overload.
- Compact Footprint, Light Weight — 105 × 165 × 249 mm, 4 kg. Fits next to a scope on a crowded bench, lifts with one hand, packs into a service van without rearranging the back.
- Set-Point Programming Accuracy — <0.5% + 20 mV on voltage, <0.5% + 10 mA on current — published set-point accuracy that lets you trust the dial reading for precision work.
- Knob-and-Button Operation — No firmware to update, no PC software to install, no LAN port to configure. Front-panel only.
The Bench Supply Sized for the Bench It's Actually On
Most three-channel bench supplies are 8–10 kg in a 260+ mm-wide chassis — perfectly reasonable on a permanent lab bench, considerably less reasonable on a hobbyist workbench, a maker space's shared station, or a service tech's mobile cart. The UTP3315TFL-II is what UNI-T's product line offers when one channel is enough but the current rating needs headroom.
For DIY electronics with motor or RF loads, kit assembly, board-level repair work on power-stage circuits, and second-supply duty next to a multi-channel main supply, the value math here is clean. 150W of linear DC at 10 mV / 1 mA resolution, at a price the bench-supply line's three-channel models can't approach. When you only need one rail at higher current, you only pay for one rail.
Applications
DIY Electronics & Hobbyist Workshops
UNI-T's own datasheet positions this supply for "DIY electronics hobbyists, electronics manufacturing and testing." The 5A capability handles amateur radio rigs, EV-conversion bench testing, motor-driven robotics prototyping, and the higher-power projects that the 3A model runs short on.
Teaching Labs & Trade Schools
One supply per station at a per-station cost that lets a 30-bench classroom stay in budget — with the current capability for higher-power lab exercises (motor drive, power amplifiers, LED arrays). Compact footprint leaves bench space for the scope and the DMM.
Service & Repair
Reliable single-rail bench supply for board-level service work where the device under test is a higher-current load — small motor drives, switch-mode supplies under test, automotive electronics, audio amplifier service. CV/CC auto crossover handles unknown loads safely.
Second-Rail Bench Companion
When your main bench supply is occupied with the primary DUT, the UTP3315TFL-II handles auxiliary rails at higher current — supplying motor drivers under separate test, larger-load adapter boards, or quick test setups that don't justify reconfiguring the main supply.
Frequently Asked Questions
Does the UTP3315TFL-II have USB or SCPI?
No. The UTP3315TFL-II is a fully analog, knob-and-button bench supply — no USB data interface, no LAN, no SCPI command set, no PC software. The "Programming accuracy" specification on the datasheet refers to set-point accuracy (how close the actual output is to the dial reading), not remote programmability. If your workflow needs SCPI control, the programmable counterparts in the UNI-T linear PSU family are the UDP3303C and UDP3305C (USB + RS-232) and the UDP3000S series (USB + LAN + LXI).
What's the difference between the UTP3315TFL-II and the UTP3313TFL-II?
Output current. UTP3315TFL-II delivers 0–5A (150W total). UTP3313TFL-II delivers 0–3A (90W total). Voltage range, display, and physical dimensions are identical between the two. The 5A model has a slightly relaxed ripple spec (≤2 mVrms vs ≤1 mVrms) reflecting the higher-current rectifier stage. Choose the 3A model for general analog work; choose the 5A model when current headroom matters more than the last factor-of-two on ripple.
Why a linear supply instead of switching?
Linear topology produces fundamentally cleaner output — no switching frequency, no harmonic spurs, ripple under 2 mVrms. For analog bench work, audio circuits, low-noise sensor development, and any precision measurement where supply noise shows up in the result, the difference is measurable. The trade-off is lower efficiency and more heat, which at 150W in a 4 kg chassis is acceptable for the price-to-cleanliness ratio.
What's included with the UTP3315TFL-II?
The UTP3315TFL-II ships with the instrument, an international standard power cord, test output line Ships from authorized US dealer.
Specifications
| Model | UTP3315TFL-II |
| Channels | 1 |
| Output Voltage | 0–30V |
| Output Current | 0–5A |
| Total Output Power | 150W |
| Voltage Resolution | 10 mV |
| Current Resolution | 1 mA |
| Load Regulation | CV ≤0.01% + 5 mV CC ≤0.1% + 10 mA |
| Programming Accuracy (25°C ±5°C) | Voltage: <0.5% + 20 mV Current: <0.5% + 10 mA |
| Output Regulation Resolution | CV: 10 mV (typical) CC: 1 mA (typical) |
| Ripple & Noise | ≤2 mVrms |
| Display | LED voltage and current dual display |
| Protection | Auto CV/CC crossover with current limit protection |
| Reliability | MTBF ≥ 2,000 hrs |
| AC Input | 110V / 220V ±5% AC, 50/60 Hz |
| Dimensions (W×H×D) | 105 × 165 × 249 mm |
| Weight | 4 kg |
| Certifications | CE |
Documentation
Options & Accessories
Included in box:
- Power cord
- English download guide
- multi-language safety manual
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