What the 100 kHz ceiling means for your circuit
The NE555D is a single 555-type timer/oscillator rated for a maximum frequency of 100 kHz. That's the astable top end — for a one-shot or missing-pulse detector you'll be well below that, but if you need a 200 kHz PWM or a fast clock, this isn't the part. Supply voltage spans 4.5V to 16V, so it runs happily off a 5V rail or a 9V battery. The 10 mA supply current is typical for a 555 at 5V — nothing to worry about for a breadboard project, but worth noting if you're running it off a coin cell.
Package and soldering reality
The NE555D comes in an 8-SOIC package (0.154" wide, 3.90 mm body width). That's a hand-solderable footprint with a fine-tip iron — no hot-air gun required. If you're a hobbyist, a cheap SOIC-8 breakout board makes it breadboard-friendly. It's a surface-mount part, so no through-hole legs. The 0.154" width is the narrow SOIC variant — fits standard SOIC-8 land patterns.
Lifecycle and compliance at a glance
ROHS3 compliant — no lead, no RoHS exemptions. That's the current EU standard, so it ships into Europe without paperwork headaches.