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SN74HC Series DIP-16 CMOS Logic ICs — 74HC221 237 251 253 257 258 259 (2pcs)
SN74HC Series DIP-16 CMOS Logic ICs 74HC221 237 251 253 257 258 259 (2pcs)
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SN74HC Series — DIP-16 CMOS Logic ICs
A selection of 74HC-series DIP-16 CMOS logic ICs covering multivibrators, decoders, multiplexers, and latches. Each listing provides 2 pieces of the selected type — new and original parts for digital logic design, prototyping, and repair.
Available IC Types & Functions
| Part Number | Function | Key Feature |
|---|---|---|
| SN74HC221 | Dual Monostable Multivibrator | Retriggerable, clear input, RC timing |
| SN74HC237 | 3-to-8 Line Decoder/Demultiplexer | Address latch, active-high outputs |
| SN74HC251 | 8-to-1 Data Selector/Multiplexer | 3-state output, complementary outputs |
| SN74HC253 | Dual 4-to-1 Multiplexer | 3-state output, common select |
| SN74HC257 | Quad 2-to-1 Multiplexer | 3-state output, non-inverting |
| SN74HC258 | Quad 2-to-1 Multiplexer | 3-state output, inverting |
| SN74HC259 | 8-Bit Addressable Latch | Individual output enable, set/reset |
Key Specifications (All Types)
| Parameter | Value |
|---|---|
| Logic Family | 74HC (High-Speed CMOS) |
| Package | DIP-16 |
| Supply Voltage (Vcc) | 2V – 6V |
| Output Current (IOL/IOH) | 25mA / -25mA |
| Propagation Delay (typ.) | 8–12ns @ 5V |
| Operating Temperature | -40°C to +85°C |
| Quantity | 2 PCS |
Why Choose 74HC Series?
- ✅ High-speed CMOS — 8–12ns propagation delay, suitable for MHz-range logic
- ✅ Wide voltage range 2–6V — compatible with 3.3V and 5V systems
- ✅ 25mA output drive — directly drives LEDs and bus lines
- ✅ DIP-16 breadboard compatible — ideal for prototyping and repair
- ✅ Industry-standard pinout — compatible with 74LS, 74HCT, 74ACT equivalents
Typical Applications by Type
- 74HC221 — pulse stretcher, debounce circuit, one-shot timer for switch inputs
- 74HC237 — address decoder for memory-mapped I/O, LED matrix row select
- 74HC251 — 8-channel analog/digital multiplexer for ADC input selection
- 74HC253/257 — bus multiplexer for shared data bus between two sources
- 74HC259 — addressable latch for expanding GPIO output pins
FAQ
Q: What is the difference between 74HC257 and 74HC258?
A: Both are quad 2-to-1 multiplexers with 3-state output. 74HC257 has non-inverting outputs (Y = selected input); 74HC258 has inverting outputs (Y = ¬selected input). Use 257 for transparent data routing, 258 when inversion is needed.
Q: Can 74HC251 replace 74LS251?
A: Yes in most cases. 74HC251 has higher output drive (25mA vs 8mA for LS) and lower power. Ensure Vcc is 5V for LS-compatible input thresholds, or use 74HCT251 for guaranteed TTL-level compatibility.
Q: Is 74HC221 the same as 74HC123?
A: Both are dual retriggerable monostable multivibrators. 74HC221 has separate A (falling-edge) and B (rising-edge) trigger inputs; 74HC123 has similar functionality with slightly different trigger logic. Check the datasheet for your specific timing requirements.
Package Contents
- 2× Selected SN74HC Series DIP-16 Logic IC (type per variant selected)
