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SN74HC541N / 74HC573N / 74HC273N / 74HC574N DIP-20 CMOS Logic IC (2pcs)
SN74HC541N / 74HC573N / 74HC273N / 74HC574N DIP-20 CMOS Logic IC (2pcs)
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SN74HC541N / 74HC573N / 74HC273N / 74HC574N — DIP-20 CMOS Logic ICs
A selection of essential 74HC-series octal logic ICs in DIP-20 through-hole package. These high-speed CMOS devices cover the most common bus buffering, latching, and flip-flop functions used in digital logic design. Each listing provides 2 pieces of the selected type.
IC Type Comparison
| Part Number | Function | Trigger | Output Enable |
|---|---|---|---|
| SN74HC541N | Octal Buffer/Line Driver (non-inverting) | N/A | Active-low ŋE1, ŋE2 |
| SN74HC573N | Octal D-Type Latch (transparent) | Level (LE high) | Active-low ŋOE |
| SN74HC273N | Octal D-Type Flip-Flop with Clear | Rising edge CLK | None (always enabled) |
| SN74HC574N | Octal D-Type Flip-Flop with 3-State Output | Rising edge CLK | Active-low ŋOE |
Key Specifications (All Types)
| Parameter | Value |
|---|---|
| Logic Family | 74HC (High-Speed CMOS) |
| Package | DIP-20 |
| Supply Voltage (Vcc) | 2V – 6V |
| Output Current (IOL/IOH) | 25mA / -25mA |
| Propagation Delay (typ.) | 7ns @ 5V |
| Input Voltage (VIH) | 3.5V min @ 5V Vcc |
| Operating Temperature | -40°C to +85°C |
| Quantity | 2 PCS |
Why Choose 74HC Series?
- ✅ High-speed CMOS — 7ns propagation delay, suitable for MHz-range logic
- ✅ Wide voltage range — 2V to 6V, compatible with 3.3V and 5V systems
- ✅ 25mA output drive — directly drives LEDs and bus lines
- ✅ DIP-20 package — breadboard and PCB compatible
- ✅ Industry-standard pinout — compatible with 74LS, 74HCT, 74ACT equivalents
Compatible With / Works With
- Arduino UNO/Mega data bus expansion (74HC573 as address latch)
- 8051 / Z80 / 6502 microprocessor bus demultiplexing (74HC573)
- FPGA I/O expansion and level shifting
- LED matrix row/column driver (74HC574 with 3-state output)
- Logic analyzer probe buffering (74HC541)
Typical Applications
- Address Latch — 74HC573 demultiplexes ALE signal on 8051/8085 bus
- Data Bus Buffer — 74HC541 isolates microcontroller from high-capacitance bus
- Register File — 74HC273/574 stores 8-bit data on clock edge
- LED Matrix Driver — 74HC574 drives 8 LEDs with 3-state output control
- Logic Level Conversion — 3.3V to 5V bus translation with 74HC541
FAQ
Q: What is the difference between 74HC573 and 74HC574?
A: 74HC573 is a transparent latch (output follows input when LE=high, latches when LE=low). 74HC574 is an edge-triggered flip-flop (captures input on rising clock edge). Use 573 for address latching, 574 for registered data storage.
Q: Can 74HC541 replace 74LS541?
A: Yes in most cases. 74HC541 has higher output drive (25mA vs 8mA for LS) and lower power consumption. Ensure Vcc is 5V for LS-compatible input thresholds, or use 74HCT541 for guaranteed TTL-level compatibility.
Q: Are these 3.3V compatible?
A: Yes. 74HC series operates from 2V to 6V. At 3.3V Vcc, VIH min = 2.31V, compatible with most 3.3V logic outputs.
Package Contents
- 2× Selected 74HC DIP-20 Logic IC (type per variant selected)
