Keithley 2604B Dual-Channel System SourceMeter SMU Instrument, Benchtop Version (3A DC, 10A Pulse)Key Features At A Glance Family spans nine models with output ranges from 200 V down to 0.1 fA sensitivity and pulse currents up to 10 A Tightly integrated 4-quadrant voltage/current source and measure with 6½-digit resolution for source and measurement Built-in Java-based test software runs directly from any web browser for plug-and-play I-V characterization with no PC installation Test Script Processor (TSP) embeds complete test programs inside the instrument to eliminate PC-bus overhead during automated test TSP-Link expansion interface synchronizes multiple units as a single multi-channel system without a mainframe (not available on 2604B/2614B/2634B) Standard interfaces include USB 2.0, LXI Class C Ethernet (10/100BT), IEEE-488 GPIB, RS-232, and 14-bit digital I/O High-capacitance mode supports capacitive loads up to 50 µF (typical) for stable sourcing into reactive devices Software-compatible with the Keithley Model 2400 SourceMeter for migration of legacy test code The Keithley Series 2600B System SourceMeter SMU instruments are a family of source-measure units built on Keithley's third-generation SMU architecture. Each model combines the capabilities of a precision power supply, true current source, 6½-digit DMM, arbitrary waveform generator, pulse generator, and electronic load into a single tightly integrated instrument. The family includes single- and dual-channel configurations across three performance tiers — the 2601B/2602B/2604B for 3 A DC and 10 A pulse operation, the 2611B/2612B/2614B for 200 V and 10 A pulse operation, and the 2634B/2635B/2636B for low-current work down to 0.1 fA sensitivity.The datasheet identifies I-V functional test and characterization across a wide range of devices as the primary application set. Listed device categories include two- and three-leaded discrete and passive components — sensors, disk drive heads, metal oxide varistors, diodes, zener diodes, capacitors, thermistors, small-signal BJTs, and FETs — along with simple ICs such as optos, drivers, switches, sensors, converters, and regulators. The datasheet also calls out integrated devices including analog ICs, RFICs, ASICs, and system-on-a-chip parts; optoelectronic devices such as LEDs, laser diodes, HBLEDs, VCSELs, and displays; wafer level reliability work including NBTI, TDDB, HCI, and electromigration; and solar cells and batteries.ValueTronics is an authorized Keithley channel partner with a 20,000 sq ft secure facility at 1675 Cambridge Drive in Elgin, Illinois. Every Series 2600B unit we list — whether new or pre-owned — is processed through our in-house receiving, inspection, and test workflow before it ships. That work is performed by our own technicians in our own facility, not drop-shipped from a third party. The result is a documented condition report on every used unit and a single accountable contact if anything needs follow-up after delivery.Brand HeritageKeithley Instruments was founded in 1946 in Cleveland, Ohio and built its reputation on precision low-level current and voltage measurement. The company was acquired by Danaher Corporation in 2010 and, following Danaher's 2016 spin-off of its instrumentation businesses, became part of Fortive. Keithley today operates as a Tektronix company within the Fortive portfolio — the corporate co-branding visible on this datasheet's footer reflects that structure. Product development, calibration, and service support for the Series 2600B continue under the Keithley brand.Compare Other Models in This SeriesThe Series 2600B is organized into three I-V envelopes that share a common architecture, common firmware, common TSP scripting, and a common set of host interfaces. The 2601B/2602B/2604B group is the 3 A / 40 V tier, optimized for higher-current source work with a 10 A pulse capability. The 2611B/2612B/2614B group is the 200 V / 1.5 A tier, optimized for higher-voltage work on the same physical chassis. The 2634B/2635B/2636B group shares the 200 V / 1.5 A envelope of the 2611B family but adds the low-current measurement ranges — down to 0.1 fA display resolution — needed for leakage, gate current, and other femtoamp-class characterization.Within each tier, the model number suffix indicates channel count and feature set: single-channel system models (2601B, 2611B, 2635B), dual-channel system models with full TSP-Link, contact check, and digital I/O (2602B, 2612B, 2636B), and dual-channel benchtop versions with TSP-Link, contact check, and digital I/O removed (2604B, 2614B, 2634B). The benchtop versions are positioned by the datasheet as value-priced alternatives for applications that do not require system-level automation.Each model on this page links to its own dedicated product page with condition-matched pricing. Whether you need a new 2602B for a multi-channel R&D bench or a new 2636B for femtoamp leakage work, the specifications and capabilities described here apply across both new and pre-owned units — the difference is condition, documentation, and price.The practical differences between the three tiers come down to the I-V envelope and the lowest measurable current. If the device under test runs at 3 A or higher current and below 40 V, the 2601B/2602B/2604B tier delivers the most usable power per channel (40.4 W vs. 30.3 W). If the device requires up to 200 V at lower currents, the 2611B/2612B/2614B tier or the 2634B/2635B/2636B tier are the correct choices. The deciding factor between those two 200 V tiers is the low end: the 2634B/2635B/2636B add the 100 pA and 1 nA current ranges (1 nA range on the 2635B; 100 pA range on the 2634B/2636B per the asterisked note) that the 2611B family does not have.Channel count and system features track the suffix. The single-channel models (2601B, 2611B, 2635B) are the right answer for applications that need one independent source/measure point. The dual-channel system models (2602B, 2612B, 2636B) double the channel density and retain TSP-Link expansion, contact check, and the 25-pin digital I/O — making them the building block for multi-SMU automated test. The dual-channel benchtop models (2604B, 2614B, 2634B) keep both channels but drop TSP-Link, contact check, and digital I/O. Model Channels Max Voltage Max Current (Pulse) 2604B 2 40 V 10 A 2601B 1 40 V 10 A 2602B 2 40 V 10 A 2611B 1 200 V 10 A Additional differences in specifications beyond the few shown above are not listed here — see each model's full specifications below.Accessories Supplied Operators and Programming Manuals 2600-KIT: Mating Screw Terminal Connectors with strain relief and covers CA-180-3A: TSP-Link/Ethernet Cable (two per unit) TSP Express Software Tool (embedded) Test Script Builder Software (supplied on CD) LabVIEW Driver Product Core & Specifications Specification Value Benchtop version — does not include TSP-Link, Contact Check, or Digital I/O capabilities. Voltage Source Voltage Ranges 100 mV, 1 V, 6 V, 40 V Voltage Programming Accuracy (1 Year) 0.02% + 250 µV (100 mV) to 0.02% + 12 mV (40 V) Maximum Output Power 40.4 W per channel Source/Sink Limits ±40.4 V @ ±1.0 A, ±6.06 V @ ±3.0 A Current Source Current Ranges 100 nA to 10 A (pulse) Current Programming Resolution (min) 2 pA Source/Sink Limits ±1.01 A @ ±40.0 V, ±3.03 A @ ±6.0 V Pulse Max Pulse Current 10 A @ 20 V (1.8 ms, 1% duty) Measurement Voltage Resolution (display) 100 nV Current Resolution (display) 100 fA Input Resistance >10 GΩ General Contact Check Not available on Model 2604B TSP-Link Not available on Model 2604B Digital I/O Not available on Model 2604B Interfaces IEEE-488, USB 2.0, RS-232, Ethernet (LXI Class C) Power Supply 100 V to 250 VAC, 50-60 Hz, 240 VA max Operating Temperature 0°-50°C Dimensions 89 mm H × 213 mm W × 460 mm D Weight 5.50 kg (12.0 lbs) Important: 200 V operation on the 2611B/2612B/2614B and 2634B/2635B/2636B requires the safety interlock pin on the digital I/O connector to be driven high (>3.4 V at 24 mA, absolute maximum 6 V). When the INTERLOCK signal is below 0.4 V, 200 V operation is blocked.Important: 200V operation on Models 2611B, 2612B, 2614B, 2634B, 2635B, and 2636B requires an active Safety Interlock signal (>3.4V @ 24mA) on the Digital I/O connector. 200V operation will be blocked when the INTERLOCK signal is
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