{"product_id":"udp3303c","title":"UDP3303C 3Ch 195W 30V\/3A Programmable Linear DC Power Supply","description":"\u003ch1\u003eUNI-T UDP3303C 3Ch Advanced Series Programmable Linear DC Power Supply\u003c\/h1\u003e\n\n\u003cdiv class=\"product-container\"\u003e\n\u003ch2\u003eOverview\u003c\/h2\u003e\n  \u003cp\u003eThe UDP3303C is the SCPI-programmable counterpart to the UDP3303A — same 195W three-channel linear hardware, same CH3 logic-rail selector cycling 1.8V \/ 2.5V \/ 3.3V \/ 5V at 3.2A, same ≤1 mVrms ripple — with a back-panel USB-Device port and RS-232 added for full SCPI control. CH1 and CH2 deliver 0–30V at 0–3A; series and parallel modes extend that to 60V or 6A.\u003c\/p\u003e\n  \u003cp\u003eProgramming accuracy holds inside ≤0.1% + 30 mV on voltage and ≤0.5% + 2 mA on current — fine enough for sleep-mode current characterization on IoT prototypes, battery-charge cut-off testing, and any automated sweep that needs the setpoint to land exactly where you asked it. Five preset storage groups (M1–M5), shutdown memory, OVP \/ OCP \/ OTP per channel, and a Digital I\/O hardware ON\/OFF pin pair round out a programmable supply built for benches that have to behave the same way every time. For 5A per adjustable channel, see the UDP3305C; for the knob-only manual variant, see the UDP3303A.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-container\"\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cdiv class=\"product-key-features\"\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThree Channels, 195W Total — SCPI Programmable\u003c\/strong\u003e — CH1 and CH2: 0–30V \/ 0–3A adjustable. CH3: switchable 1.8V \/ 2.5V \/ 3.3V \/ 5V at 3.2A. SCPI control over USB-Device or RS-232.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUSB-Device + RS-232 with SCPI\u003c\/strong\u003e — Back-panel data interfaces for PC connection. Standard accessories include both a USB cable (UT-D14) and RS-232 communication line — pick the bus your test rig already uses.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProgramming Accuracy ≤0.1% + 30 mV\u003c\/strong\u003e — Voltage programming accuracy ≤0.1% + 30 mV; current programming accuracy ≤0.5% + 2 mA. Set value matches output value across the full range.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCH3 Logic-Rail Selector\u003c\/strong\u003e — Single front-panel button cycles CH3 through 1.8V \/ 2.5V \/ 3.3V \/ 5V at 3.2A. CMOS, microcontroller cores, legacy TTL, USB-class — covered without sacrificing CH1\/CH2.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLinear Topology, ≤1 mVrms Ripple\u003c\/strong\u003e — Clean DC output for low-noise analog work. Load regulation ≤0.01% + 3 mV in CV mode.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e10 mV \/ 1 mA Resolution\u003c\/strong\u003e — Four-digit voltage and current display per channel on EBTN LCD.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries, Parallel, and Tracking Modes\u003c\/strong\u003e — Combine CH1+CH2 for up to 60V series or 6A parallel from the front panel. SCPI exposes the same modes for automated test integration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOVP \/ OCP \/ OTP Protection\u003c\/strong\u003e — Configurable per-channel thresholds, plus over-temperature shutdown and keypad lock.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFive Preset Storage Groups\u003c\/strong\u003e — M1–M5 store full instrument states for fast bench setup. Shutdown memory restores last settings on power-up.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFront-Panel 5V\/2A USB Charging Port (CH4)\u003c\/strong\u003e — Independent 5V\/2A USB-A charging output. Charging output only — the data interfaces are USB-Device and RS-232 on the back panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHardware Output Disable via Digital I\/O\u003c\/strong\u003e — Two-pin Digital I\/O terminal for emergency cutoff and external interlock circuits.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"product-container\"\u003e\n\u003ch2\u003eDetailed Features\u003c\/h2\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"product-container\"\u003e\n\u003cdiv class=\"product-row\"\u003e\n\u003cdiv class=\"product-box product-left\"\u003e\n\u003ch3\u003eCH3 Logic-Rail Selector — One Button, Four Voltages\u003c\/h3\u003e\n\u003cp\u003eMost three-channel bench supplies give you two adjustable channels and a fixed 5V rail you'll resent the moment you need 3.3V. The UDP3303C's CH3 cycles between 1.8V, 2.5V, 3.3V, and 5V at 3.2A — covering CMOS logic, modern microcontroller cores, legacy TTL, and USB-class devices — at a single front-panel button press. CH1 and CH2 stay free for the analog work the linear topology is genuinely good at — op-amp rails, sensor bias, charge-pump references, audio circuits — while CH3 handles whatever digital subsystem the project also needs powered. One supply, two adjustable analog rails, one switchable digital rail, all labeled, all protected, all SCPI-controllable.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-box product-right\"\u003e\n\u003cfigure class=\"product-figure\"\u003e\n\u003ca href=\"#lb-udp3303c-h3-1\" class=\"product-thumb-link\"\u003e\n\u003cimg src=\"https:\/\/res.cloudinary.com\/uni-t\/image\/upload\/udp3000-buttons.jpg\" alt=\"UNI-T UDP3303C — ch3 logic-rail selector\" class=\"product-image-thumb\"\u003e\n\u003c\/a\u003e\n\u003cfigcaption class=\"product-figcaption\"\u003eUNI-T UDP3303C — ch3 logic-rail selector\u003c\/figcaption\u003e\n\u003c\/figure\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ca id=\"lb-udp3303c-h3-1\" href=\"#_\" class=\"product-lightbox\"\u003e\n\u003cspan class=\"lightbox-close\"\u003e×\u003c\/span\u003e\n\u003cimg src=\"https:\/\/res.cloudinary.com\/uni-t\/image\/upload\/udp3000-buttons.jpg\" alt=\"UNI-T UDP3303C — ch3 logic-rail selector\"\u003e\n\u003cspan class=\"lightbox-caption\"\u003eUNI-T UDP3303C — ch3 logic-rail selector\u003c\/span\u003e\n\u003c\/a\u003e\n\n\u003cdiv class=\"product-container\"\u003e\n\u003cdiv class=\"product-row\"\u003e\n\u003cdiv class=\"product-box product-left\"\u003e\n\u003cfigure class=\"product-figure\"\u003e\n\u003ca href=\"#lb-udp3303c-h3-2\" class=\"product-thumb-link\"\u003e\n\u003cimg src=\"https:\/\/res.cloudinary.com\/uni-t\/image\/upload\/udp3000_save_recall.jpg\" alt=\"UNI-T UDP3303C — scpi programmable for repeatable bench work\" class=\"product-image-thumb\"\u003e\n\u003c\/a\u003e\n\u003cfigcaption class=\"product-figcaption\"\u003eUNI-T UDP3303C — scpi programmable for repeatable bench work\u003c\/figcaption\u003e\n\u003c\/figure\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-box product-right\"\u003e\n\u003ch3\u003eSCPI Programmable for Repeatable Bench Work\u003c\/h3\u003e\n\u003cp\u003eThe UDP3303C is the programmable counterpart to the UDP3303A — same hardware, same protection, same CH3 logic-rail selector — with a back-panel USB-Device port and RS-232 added for SCPI control. Script the rails over USB or RS-232, capture readbacks, document the run, and repeat it tomorrow morning the same way. Programming accuracy holds inside ≤0.1% + 30 mV on voltage and ≤0.5% + 2 mA on current — fine enough for IoT sleep-mode current characterization, battery-charge cut-off testing, and any sweep that needs the setpoint to land where you asked it to. Five preset storage groups (M1–M5) and a Digital I\/O hardware ON\/OFF pin pair round out a programmable supply built for benches that have to behave the same way every time.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ca id=\"lb-udp3303c-h3-2\" href=\"#_\" class=\"product-lightbox\"\u003e\n\u003cspan class=\"lightbox-close\"\u003e×\u003c\/span\u003e\n\u003cimg src=\"https:\/\/res.cloudinary.com\/uni-t\/image\/upload\/udp3000_save_recall.jpg\" alt=\"UNI-T UDP3303C — scpi programmable for repeatable bench work\"\u003e\n\u003cspan class=\"lightbox-caption\"\u003eUNI-T UDP3303C — scpi programmable for repeatable bench work\u003c\/span\u003e\n\u003c\/a\u003e\n\n\u003cdiv class=\"product-container\"\u003e\n\u003ch2\u003eApplications\u003c\/h2\u003e\n\u003cdiv class=\"product-app-grid\"\u003e\n\u003cdiv class=\"product-app-card\"\u003e\n\u003ch3\u003eR\u0026amp;D Bench \u0026amp; Prototyping\u003c\/h3\u003e\n\u003cp\u003eThree rails (two adjustable, one switchable digital) with SCPI control script the bench setup directly from your test framework. Linear topology and ≤1 mVrms ripple keep supply noise out of measurement on op-amp characterization, ADC reference rails, and sensor-bridge excitation work.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-app-card\"\u003e\n\u003ch3\u003eAutomated Test Lab Integration\u003c\/h3\u003e\n\u003cp\u003eSCPI over USB-Device or RS-232 integrates with LabVIEW, Python-VISA, and shell-driven test frameworks. Five preset storage groups keep frequently used test setups one command away. Programming accuracy ≤0.1% + 30 mV keeps automated sweeps repeatable across runs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-app-card\"\u003e\n\u003ch3\u003eTeaching Labs \u0026amp; Automated Lab Exercises\u003c\/h3\u003e\n\u003cp\u003eFor curricula that introduce instrument automation alongside instrument operation, the UDP3303C lets a class go from manual front-panel work to scripted SCPI control without changing the instrument.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-app-card\"\u003e\n\u003ch3\u003eMixed-Signal Development\u003c\/h3\u003e\n\u003cp\u003eCH1 and CH2 power analog rails at low ripple; CH3 cycles through digital-side voltages without retuning. SCPI lets the test script raise or lower the digital rail while CH1\/CH2 hold the analog supplies steady — useful for power-sequencing and sleep-mode characterization on mixed-signal prototypes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"product-container\"\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"product-faq-item\"\u003e\n\u003cp class=\"product-faq-question\"\u003eWhat's the difference between the UDP3303A and the UDP3303C?\u003c\/p\u003e\n\u003cp\u003eThe UDP3303C adds SCPI programmability over USB-Device and RS-232. Hardware (channels, voltage, current, power, CH3 logic-rail selector, protection, display, dimensions) is otherwise identical. Choose the UDP3303A if your bench is knob-only; choose the UDP3303C if you need automated test integration. For 5A per adjustable channel instead of 3A, step up to the UDP3305C.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-faq-item\"\u003e\n\u003cp class=\"product-faq-question\"\u003eDoes the UDP3303C have LAN?\u003c\/p\u003e\n\u003cp\u003eNo. The UDP3303C's data interfaces are USB-Device (back-panel SCPI port for PC connection) and RS-232. If your workflow needs LAN with LXI\/web interface, the UDP3000S series adds it on the same linear-PSU platform. The Digital I\/O pin pair on the back panel handles hardware ON\/OFF — useful for external interlocks but not for data communication.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-faq-item\"\u003e\n\u003cp class=\"product-faq-question\"\u003eWhat is the front-panel USB port for?\u003c\/p\u003e\n\u003cp\u003eIt's a 5V\/2A USB-A charging output (CH4) — for charging a phone or powering a USB-powered demo board. It is explicitly not a data interface. The SCPI data ports are on the back panel: USB-Device and RS-232.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-faq-item\"\u003e\n\u003cp class=\"product-faq-question\"\u003eCan the UDP3303C run automated voltage\/current sweeps?\u003c\/p\u003e\n\u003cp\u003eYes — SCPI control over USB-Device or RS-232 supports remote voltage and current setpoint commands plus readbacks, and the five preset storage groups (M1–M5) keep frequently used configurations available for fast recall. For complex programmable waveform output (list\/delayer functions), the UDP3000S series adds those capabilities on the same linear platform.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-faq-item\"\u003e\n\u003cp class=\"product-faq-question\"\u003eWhy a linear supply instead of switching for SCPI work?\u003c\/p\u003e\n\u003cp\u003eLinear topology produces fundamentally cleaner output — no switching frequency, no harmonic spurs, ripple under 1 mVrms. SCPI control gives you automation; linear regulation keeps the output clean enough for the precision measurements that automated test usually exists to take in the first place. The trade-off is lower efficiency and more heat, which at 195W bench-supply scale is not a meaningful constraint.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-faq-item\"\u003e\n\u003cp class=\"product-faq-question\"\u003eWhat's included with the UDP3303C?\u003c\/p\u003e\n\u003cp\u003eThe UDP3303C ships with the instrument, power cord, USB communication cable (UT-D14), RS-232 communication line, alligator clip test leads, English user manual Ships from authorized US dealer.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"UNI-T","offers":[{"title":"Default Title","offer_id":46699364450588,"sku":"181730080304X","price":349.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/9208\/0924\/files\/UDP3303C_Cables.jpg?v=1720807343","url":"https:\/\/uni-trendus.com\/products\/udp3303c","provider":"Uni-Trend US","version":"1.0","type":"link"}