--- type: product schema_version: 1 stock_number: "58037-1" canonical_url: "https://www.artisantg.com/TestMeasurement/58037-1/Stanford-Research-Systems-SR445A-350-MHz-Preamplifier" json_url: "https://www.artisantg.com/TestMeasurement/58037-1/Stanford-Research-Systems-SR445A-350-MHz-Preamplifier.json" generated_at: "2026-11-06T23:50:05.961Z" last_updated: "2026-10-14T13:00:51.160-05:00" --- # Stanford Research Systems SR445A 350 MHz Preamplifier _Summary and Categories are this item's record. The description sections and FAQ are machine-assisted and can contain errors; where they disagree with the record, the record is correct, and where description sections disagree with each other, Details wins._ ## Summary - Manufacturer: Stanford Research Systems - Model: SR445A - Condition: Used and in Excellent Condition - Price: Quote only - Availability: Not in Stock - Warranty: 1-Year Warranty with 30-Day Return Guarantee - ITAR restricted: No - Shipping weight: 3 lb - Shipping dimensions: 14X14X6 in ## Categories - Test Equipment > Electrical Test > Amplifiers (primary) ## Overview specification: A four-channel, DC to 350 MHz preamplifier housed in a single-width NIM (Nuclear Instrument Module) crate standard. It provides a fixed voltage gain of 5 for amplifying fast, low-level analog or digital signals. Each channel features a 50 O BNC input and two complementary 50 O BNC outputs (inverting and non-inverting) for interfacing with timing discriminators, counters, or oscilloscopes. Common applications include amplifying signals from photomultiplier tubes (PMTs), microchannel plates, and fast photodiodes for photon counting, fast-timing, and time-of-flight experiments. ## Function High-bandwidth AC-coupled voltage preamplifier providing gain up to 100x, designed for low-noise amplification of fast signals with input bandwidth up to 350 MHz; operates with 50 O input/output impedance and interfaces via BNC connectors; supports cascading for higher gain, suitable for fast photodiode, PMT, and other low-level pulsed signal amplification in laboratory measurement systems. ## Platform platforms: A standalone, DC-powered module designed for benchtop or system integration. Interfaces via BNC connectors for four independent 50 O input/output channels. A rear DB15 connector supplies power and remote gain control. Commonly used to amplify fast, low-level analog signals from photomultiplier tubes, photodiodes, or particle detectors for input into oscilloscopes, digitizers, lock-in amplifiers, or photon counters in physics, spectroscopy, and high-speed signal recovery applications. ## Application High-bandwidth preamplification of fast analog pulses in nuclear, particle physics, and time-resolved optical experiments; signal conditioning for photomultiplier tubes, fast photodiodes, and charge-sensitive detectors; noise reduction and signal-to-noise enhancement in high-speed digital systems; integration into modular instrument racks via standard BNC connectors for differential or single-ended signal interfacing. ## Accessories accessories: Requires SR445 DC Power Supply/Preamplifier Mainframe for operation. Interfaces include one BNC female signal input, four BNC female signal outputs, and one 9-pin D-sub (DB-9) female power connector. The power connector receives ±12 VDC, +5 VDC, and ground from the mainframe. Standard BNC coaxial cables are needed for signal connections. ## Interface Interfaces: Four BNC female connectors (input, output, monitor, offset input), 2-pin mini power connector (±15V DC), maximum input voltage ±5V, bandwidth DC to 350 MHz, input impedance 50 O or 1 MO, output impedance 50 O. ## Images - - - - -