M74HCT573M1R STMicroelectronics Integrated Circuit (Small Outline Packages) In Stock
STMicroelectronics M74HCT573M1R is an octal D-type transparent latch in HCT logic family with active-low output enable, supporting 150 pF load capacitance and 20-pin SOIC package. Compatible with TTL input levels and 5 V CMOS logic for seamless bus interfacing. Available from global distributors in tape-and-reel format for automated SMT assembly.
- Manufacturer
- STMicroelectronics
- Package
- Small Outline Packages
- Pin Count
- 20
- Lifecycle
- OBSOLETE
- Datasheet
- M74HCT573M1R Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -55.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of M74HCT573M1R?
- HCT logic family provides TTL-compatible input thresholds at 5 V CMOS supply for direct interface with legacy TTL systems
- Active-low output enable (OE) allows bus isolation, making it ideal for tri-state data bus architectures
- Supports 150 pF load capacitance per output, enabling robust drive of capacitive bus lines without external buffers
- 20-pin SOIC package (R-PDSO-G20) balances compact footprint with easy hand-soldering and automated pick-and-place assembly
What is M74HCT573M1R used for?
The M74HCT573M1R is commonly used in microprocessor address and data bus demultiplexing where 8-bit parallel data needs to be latched and held stable during bus cycles. It is well suited for FPGA and CPLD peripheral interfacing, memory address latching in SRAM and Flash designs, and industrial control panel data capture where TTL-to-CMOS level bridging is required. Its unidirectional octal latch structure also fits LED display driver data hold applications.
What are the specifications of M74HCT573M1R?
| YTEOL | 0 |
| Additional Feature | BROADSIDE VERSION OF 373 |
| Control Type | ENABLE LOW |
| Count Direction | UNIDIRECTIONAL |
| Family | HCT |
| JESD-30 Code | R-PDSO-G20 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 150pF |
| Logic IC Type | BUS DRIVER |
| Max I(ol) | 0.006A |
| 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 | SOP20,.4 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Packing Method | TUBE |
| Power Supply Current-Max (ICC) | 70mA |
| Prop. Delay@Nom-Sup | 45ns |
| Propagation Delay (tpd) | 59ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 5.5V |
| Supply Voltage-Min (Vsup) | 4.5V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | MILITARY |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| HTS Code | 8542.39.00.60 |
Where can I find the M74HCT573M1R datasheet?
M74HCT573M1R Datasheet DownloadOfficial datasheet from STMicroelectronics
What are equivalent replacements for M74HCT573M1R?
Compatible alternatives and drop-in replacements for M74HCT573M1R:
Bus Driver, HCT Series, 1-Func, 8-Bit, True Output, CMOS, PDSO20
Frequently Asked Questions
How does the M74HCT573M1R differ from the 74HCT373 in pin layout and which designs prefer the 573?
The M74HCT573M1R is the broadside version of the 74HCT373, meaning inputs and outputs are arranged on opposite sides of the 20-pin SOIC package rather than intermixed. This layout simplifies PCB routing for 8-bit data bus lines, as all 8 data inputs on one side connect directly to a parallel bus without crossing traces. Designers working on memory address latching or microprocessor bus interfaces often prefer the 573 pinout for cleaner board layout.
What output drive capability does the M74HCT573M1R provide when driving 150 pF capacitive loads?
The M74HCT573M1R is specified to drive loads up to 150 pF per output while maintaining valid logic levels. Each output can sink up to 6 mA (I_OL = 6 mA) at the TTL low level. This drive strength is sufficient for most backplane bus segments and short PCB traces without additional buffer stages, making it suitable for data bus expansion in embedded systems operating at 5 V.
Can M74HCT573M1R be used alongside 3.3 V logic devices in a mixed-voltage system?
The M74HCT573M1R is a 5 V supply device with TTL-compatible input thresholds, meaning it accepts V_IH as low as 2 V. This allows 3.3 V CMOS logic outputs to directly drive its inputs without level-shift circuitry in most cases. However, the device outputs swing to the full 5 V rail, so any 3.3 V logic receiving M74HCT573M1R outputs must be 5 V tolerant to avoid damage.
What packaging and tape-and-reel options are available for M74HCT573M1R in volume production?
The M74HCT573M1R is offered in a 20-pin SOIC package (JEDEC R-PDSO-G20) with the M1R suffix indicating tape-and-reel delivery in quantities suitable for automated SMT lines. The device complies with the e4 JEDEC moisture sensitivity code and is RoHS-compliant per the e4 JESD-609 classification. Lead-free finish supports standard 260°C peak reflow profiles.
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About STMicroelectronics
STMicroelectronics is a global semiconductor leader serving customers across the spectrum of electronics applications. ST's products are found in a wide range of applications including automotive, industrial, personal electronics, and communications.
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