SN74HCT574NIn StockTexas Instruments
SN74HCT574N is an octal D-type edge-triggered flip-flop IC with 3-state outputs, featuring independent control, 27 MHz max frequency, and 150 pF load capacitance. Ideal for bus interfacing in digital systems. Available in 20-pin DIP package with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Dual-In-Line Packages
- Pin Count
- 20
- Lifecycle
- ACTIVE
- Datasheet
- SN74HCT574N Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Octal D-type edge-triggered flip-flops with independent control for maximum design flexibility
- 3-state outputs enable direct bus driving and high-impedance mode for shared bus architectures
- HCT family device with 27 MHz maximum operating frequency and TTL-compatible input levels
- 20-pin PDIP package (R-PDIP-T20) for easy breadboard prototyping and through-hole assembly
- Pb-free (e4) compliant construction meeting RoHS environmental requirements
Applications
The SN74HCT574N is widely used as an 8-bit data bus driver and register in microprocessor and microcontroller systems, enabling bidirectional data buffering between buses of different drive capabilities. It is commonly employed in address latching, data storage registers, and output port expansion in embedded systems, PLCs, and industrial control boards. Its TTL-compatible HCT logic family makes it ideal for interfacing 5V CMOS logic with legacy TTL systems in communication equipment and computing peripherals.
Specifications
| Pbfree Code | Yes |
| YTEOL | 15 |
| Control Type | INDEPENDENT CONTROL |
| Count Direction | UNIDIRECTIONAL |
| Family | HCT |
| JESD-30 Code | R-PDIP-T20 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 150pF |
| Logic IC Type | BUS DRIVER |
| Max Frequency@Nom-Sup | 27000000Hz |
| Max I(ol) | 0.006A |
| Number of Bits | 8 |
| Number of Functions | 8 |
| Number of Ports | 2 |
| Output Characteristics | 3-STATE |
| Output Polarity | TRUE |
| Package Body Material | PLASTIC/EPOXY |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Power Supply Current-Max (ICC) | 0.08mA |
| Prop. Delay@Nom-Sup | 45ns |
| Propagation Delay (tpd) | 66ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 5.5V |
| Supply Voltage-Min (Vsup) | 4.5V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | NO |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | Nickel/Palladium/Gold (Ni/Pd/Au) |
| Terminal Form | THROUGH-HOLE |
| Terminal Position | DUAL |
| Trigger Type | POSITIVE EDGE |
| Package | Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.90 |
| Country of Origin | Malaysia |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for SN74HCT574N:
Frequently Asked Questions
What is the maximum operating frequency of the SN74HCT574N?
The SN74HCT574N supports a maximum operating frequency of 27 MHz (27,000,000 Hz) at nominal supply voltage, making it suitable for mid-speed digital bus applications. Its HCT family design provides TTL-compatible input thresholds while operating from a standard 5V supply.
What package does the SN74HCT574N come in and how many pins does it have?
The SN74HCT574N is housed in a 20-pin Dual-In-Line Package (DIP), designated as R-PDIP-T20. This through-hole package is ideal for prototyping on breadboards and for designs requiring easy soldering or socketed replacement in industrial and educational applications.
What are the 3-state outputs on the SN74HCT574N used for?
The 3-state outputs allow the SN74HCT574N to be connected directly to shared data buses. When the output-enable pin is deasserted, all outputs enter a high-impedance state, preventing bus contention when multiple devices share the same bus lines. This is critical in microprocessor memory and I/O bus designs.
Is the SN74HCT574N RoHS compliant?
Yes, the SN74HCT574N carries a Pb-free code of 'Yes' and JESD-609 code e4, confirming it meets RoHS lead-free requirements. It is suitable for use in environmentally compliant end products across consumer electronics, industrial equipment, and automotive applications.
What are common alternatives or compatible replacements for the SN74HCT574N?
Compatible alternatives include the SN74HC574N (CMOS-level inputs instead of TTL-compatible), the CD74HCT574E from Texas Instruments, and similar octal flip-flops from other manufacturers such as the 74HCT574 series from NXP or ON Semiconductor. Ensure pin compatibility and verify input threshold levels before substituting in your design.
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Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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