What this NiMH charger is and where it fits
The LTC4123EDC#TRMPBF from Analog Devices is a single-cell Nickel Metal Hydride battery charger IC in a 6-DFN (2x2) package. It delivers a constant programmable charge current up to 25mA, with over-voltage fault protection built in. This part is meant for low-capacity NiMH cells — think small portable instruments, backup memory holders, or wireless sensor nodes that trickle-charge a single cell. The supply maxes out at 5V, so it runs comfortably off a USB port or a 5V rail.
Package and mounting — field-swap reality
It comes in a 6-DFN (2x2 mm) exposed pad package, surface mount. That tiny DFN is not socket-friendly — you need a hot-air station or a reflow oven to swap it. No lab, no bench, let us go: if you are troubleshooting in the field, plan to carry a pre-programmed board or a socket adapter. The exposed pad helps thermal dissipation, which matters if you push the charge current near the 25mA limit in a warm enclosure.
Lifecycle and sourcing posture
It is ROHS3 compliant. No LTB risk for ongoing production.