Product Overview
TTL 16-Line to 1-Line Inverting Multiplexer 5V Logic - 74150N
Product Condition
Unused, New Old Stock Signetics 74150N in 24-pin plastic DIP package. Clean body, straight leads, clear markings. No original retail packaging included.
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Product Overview
Signetics 74150N is a 16-line to 1-line data selector and multiplexer in the 7400-series TTL family. Designed for 5V operation, it routes one of sixteen data inputs to a single output using four binary select lines. The output is inverted, meaning the selected input appears logically inverted at the output pin.
Housed in a 24-pin PDIP package, the 74150N was widely used in late 1970s and 1980s digital systems for data routing, address decoding, and control logic. With typical propagation delay around 23ns and a fan-out of 10 standard TTL loads, it served as a core building block in arcade boards, industrial controls, and early computing hardware.
Key Features
- Device: 74150N 16-to-1 Data Selector / Multiplexer
- Logic Family: 7400-series TTL
- Inputs: 16 data lines (E0-E15)
- Select Lines: 4 binary address inputs (S0-S3)
- Strobe/Enable: Active-low control input
- Output: Single inverted data output
- Supply Voltage: 5V nominal (4.75V to 5.25V range)
- Typical Propagation Delay: 23ns (select to output)
- Fan-Out: 10 standard TTL loads
- Package: 24-pin plastic DIP, 0.600 inch row spacing
Applications
- Vintage arcade PCB repair and restoration
- Retrocomputing systems and bus logic
- Data routing in 8-bit and 16-bit designs
- Address decoding and signal selection
- Industrial control panels using TTL logic
- Educational digital logic trainers
- Replacement for failed 74150 devices in legacy boards
Frequently Asked Questions
Is the output inverted?
Yes. The 74150 provides an inverted output. The selected input appears logically inverted at the output pin. If non-inverted logic is required, an external inverter such as a 7404 must be used.
What voltage does it require?
Standard 5V TTL supply. Recommended operating range is approximately 4.75V to 5.25V.
Can this replace other 74150 variants?
It can replace other standard 74150 TTL versions in a 24-pin DIP package, provided voltage and logic family requirements match your board.
Can I substitute a 74HC150?
A 74HC150 CMOS equivalent may function in some 5V systems, but input thresholds and current characteristics differ. Verify compatibility before substitution.
What happens if inputs are left floating?
In TTL logic, floating inputs tend to read as High. For stable operation, tie unused inputs to a defined logic level.
Before programmable logic and dense CMOS, large-scale data routing meant rows of TTL like this. If you are keeping classic digital hardware alive, this chip fits right into its original logic map.
