54LS259LMQB, D Latch, LS Series TTL, Package Bulk, Lifecycle Current.
| Parameter | Value |
|---|---|
| Series | * |
| Package | Bulk |
That means no last-time-buy notice has been issued and the part remains in regular production.
That suits hand-insertion during prototype builds, rework, or low-volume production where a pick-and-place machine is not involved. If your line requires reeled parts for automated assembly, this bulk format will need manual loading into feeders or a separate taping service.
The 54LS259LMQB is the military-temperature-range version of the 74LS259. The 74LS259 is specified for 0°C to 70°C commercial operation, while the 54LS part covers the full -55°C to +125°C military range. Function and pinout are the same, but the temperature grade and screening differ.
It is a D-type latch from the 54LS low-power Schottky TTL series. The output follows the input while the latch enable is high and holds the last state when enable goes low.