Limited Stock

Signetics 74F240N Octal Inverting Buffer Line Driver FAST TTL 20-PDIP IC 1 PC

ICs / Integrated Circuits • SKU RFB00575

$4.95

Genuine vintage Signetics 74F240N FAST TTL octal inverting buffer and line driver integrated circuit in a 20-pin through-hole DIP package. Sold individually as one IC.

The 74F240N contains eight inverting buffer/driver channels arranged as two independent groups of four. Each group has its own active-low output-enable input, allowing the outputs to enter a high-impedance 3-state condition. This configuration was designed for high-speed bus buffering, memory address driving, clock distribution, data routing, logic isolation, and digital interface applications.

Specifications:

Device Type: Octal Inverting Buffer / Line Driver
Logic Family: 74F FAST TTL
Number of Channels: 8
Configuration: Two Groups of Four
Logic Function: Inverting
Output Type: 3-State
Output Enable: Active Low
Supply Voltage: 5V TTL
Recommended Supply Range: 4.5V to 5.5V
Output Sink Current: Up to 64mA
Output Source Current: Up to 15mA
Package: 20-PDIP
Pin Count: 20
Mounting Type: Through Hole
Operating Temperature Range: 0°C to +70°C
Quantity Included: 1 PC

This original Signetics-branded 74F240N is an obsolete legacy semiconductor. Signetics production of this device has long ended, making original examples useful for vintage equipment repair, restoration, and period-correct replacement work. The underlying 74F240 logic function remains available from some other semiconductor manufacturers, but original Signetics-branded devices are obsolete.

The 74F240 is especially useful in older digital systems where high-current TTL bus drivers were required to isolate logic stages and drive heavily loaded address, data, or control lines. Applications include vintage arcade PCBs, early computer hardware, industrial control boards, communications equipment, instrumentation, test equipment, and other legacy digital electronics.

HISTORICAL BACKGROUND:

Signetics was an important American semiconductor manufacturer known for analog, digital logic, memory, timer, communications, and interface integrated circuits. Its devices became common throughout industrial electronics, computers, communications hardware, test equipment, consumer electronics, and arcade-era digital systems.

The 74F FAST TTL family was developed as a higher-speed evolution of traditional bipolar TTL logic. FAST devices provided substantially improved switching performance while retaining familiar 5V TTL architecture and were widely used during the 1980s and 1990s in bus-oriented digital systems.

The 74F240 became particularly useful as a bus interface device because its eight high-current 3-state outputs could drive memory address lines, control buses, clock paths, and other heavily loaded digital signals. Original Signetics 74F240N devices are now obsolete and represent useful legacy repair stock for equipment requiring the original FAST TTL device characteristics.