SN74AHCT573NE4 Texas Instruments Integrated Circuit (Dual-In-Line Packages) In Stock
The Texas Instruments SN74AHCT573NE4 is an octal D-type transparent latch with 3-state outputs, accepting 5 V TTL-level inputs while operating from a 3.3 V or 5 V supply in the AHCT logic family. Housed in a 20-pin PDIP package with active-low output enable, it drives 8-bit data buses in embedded, industrial, and digital logic systems.
- Manufacturer
- Texas Instruments
- Package
- Dual-In-Line Packages
- Pin Count
- 20
- Lifecycle
- OBSOLETE
- Datasheet
- SN74AHCT573NE4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of SN74AHCT573NE4?
- Octal D-type transparent latch with 3-state outputs for 8-bit bus interface applications
- AHCT family accepts 5 V TTL input levels from a 3.3 V or 5 V supply rail
- Active-low output enable (OE) pin for easy bus multiplexing and isolation
- 50 pF load capacitance rating supporting standard bus-line drive requirements
- 20-pin PDIP package enabling through-hole prototyping and socketed production assembly
What is SN74AHCT573NE4 used for?
SN74AHCT573NE4 is used in address and data bus buffering on embedded processor boards, FPGA development cards, and microcontroller expansion interfaces where 8 bits of latched output need to be held stable while the source changes. It is also applied in industrial PLCs and test equipment backplanes to isolate bus segments and prevent signal contention between multiple bus masters.
What are the specifications of SN74AHCT573NE4?
| YTEOL | 0 |
| Additional Feature | BROADSIDE VERSION OF 373 |
| Control Type | ENABLE LOW |
| Count Direction | UNIDIRECTIONAL |
| Family | AHCT/VHCT/VT |
| JESD-30 Code | R-PDIP-T20 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 50pF |
| Logic IC Type | BUS DRIVER |
| Max I(ol) | 0.008A |
| Number of Bits | 8 |
| Number of Functions | 1 |
| Number of Ports | 2 |
| Output Characteristics | 3-STATE |
| Output Polarity | TRUE |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | DIP20,.3 |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Packing Method | TUBE |
| Power Supply Current-Max (ICC) | 0.04mA |
| Prop. Delay@Nom-Sup | 10ns |
| Propagation Delay (tpd) | 10ns |
| 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 | AUTOMOTIVE |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| Package | Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| HTS Code | 8542.39.00.60 |
| Country of Origin | Malaysia |
Where can I find the SN74AHCT573NE4 datasheet?
SN74AHCT573NE4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for SN74AHCT573NE4?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
Can SN74AHCT573NE4 interface directly with 5 V TTL logic outputs when powered from a 3.3 V rail?
Yes. SN74AHCT573NE4 belongs to the AHCT logic family, which accepts TTL input thresholds compatible with 5 V logic levels while drawing supply current only from its VCC rail. Powered at 3.3 V, it reliably captures 5 V TTL-driven data lines, making it a bridging latch for mixed 3.3 V and 5 V bus systems without additional level-shift ICs.
How does the output enable pin of SN74AHCT573NE4 help manage bus contention in a multi-master system?
The active-low OE pin places all 8 outputs in a high-impedance state when deasserted, effectively disconnecting the latch from the bus. With OE held high, the 3-state outputs present less than 5 µA leakage, allowing other bus drivers to assert values without back-driving through SN74AHCT573NE4, which prevents contention damage and ensures clean signal integrity.
What load capacitance is SN74AHCT573NE4 rated to drive, and how does this affect propagation delay on the output bus?
SN74AHCT573NE4 is characterized with a 50 pF load capacitance on its outputs. At this load, the AHCT family typically achieves propagation delays under 8 ns, which is fast enough to meet setup and hold time requirements on 8 MHz to 25 MHz address/data buses common in embedded systems and industrial controllers.
Is SN74AHCT573NE4 a direct drop-in alternative to the 74HC573 for a 5 V-tolerant input requirement?
SN74AHCT573NE4 is pin-compatible with the 74HC573 in the 20-pin PDIP footprint. The key difference is input threshold: the HC variant requires CMOS-level inputs with a VIH above 3.5 V at 5 V supply, while the AHCT accepts TTL VIH of only 2.0 V. When the driving source is a 5 V TTL device, SN74AHCT573NE4 is the correct selection to guarantee valid logic recognition.
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About Texas Instruments
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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