Single op-amp in SOT-23-5, 5 MHz GBW
The Maxim MAX4122EUK is a single general-purpose operational amplifier in a 5-pin SOT-23-5 surface-mount package. It delivers a 5 MHz gain-bandwidth product and a 2V/µs slew rate, with rail-to-rail output swing. Quiescent current is 725 µA per channel. Input offset voltage is specified at 350 µV, and input bias current at 50 nA. Output drive capability is 50 mA per channel.
RoHS non-compliant — verify assembly line compatibility
However, it is marked as RoHS non-compliant. This is a critical sourcing constraint: if your assembly process requires lead-free solder and RoHS-compliant materials, this part cannot go through a standard reflow profile without a waiver or exemption. For legacy or exempted military/aerospace builds where tin-lead solder is still permitted, the active status is an advantage — no end-of-life clock is ticking on this order code.
The 2V/µs slew rate limits the large-signal bandwidth to roughly 320 kHz for a 2 V peak-to-peak output swing (slew rate / π × Vpp). For smaller swings the 5 MHz GBW dominates. This is adequate for general-purpose filtering, sensor conditioning, and audio-frequency stages, but too slow for high-speed ADC drivers or video buffers. The rail-to-rail output stage helps preserve dynamic range in low-voltage single-supply designs.
Sourcing and availability
Because the MAX4122EUK is active but RoHS non-compliant, it is not stocked by every distributor. Submit an RFQ for this order code to verify stock position and lead time against your BOM line. The SOT-23-5 footprint is standard and shared with many single op-amps, so if a RoHS-compliant alternative is needed, parts like the MAX4122EUK+ (lead-free suffix) may be cross-shopped — confirm the full order code before substituting.