LEOAC244PT STMicroelectronics Integrated Circuit (Small Outline Packages) In Stock
The LEOAC244PT is a radiation-hardened octal bus buffer with 3-state outputs from STMicroelectronics in a 20-pin plastic SOP package. It provides unidirectional bus driving with active-low enable control, designed for space and high-reliability digital bus interface applications.
- Manufacturer
- STMicroelectronics
- Package
- Small Outline Packages
- Pin Count
- 20
- Lifecycle
- ACTIVE
- Datasheet
- LEOAC244PT 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
Key Features
- Radiation-hardened octal bus buffer for space and hi-rel applications
- 3-state outputs with active-low enable for reliable bus isolation
- Unidirectional data flow in the AC CMOS logic family
- Load capacitance rating of 50 pF for standard bus line driving
- 24 mA output sink current for robust logic level driving
- 20-pin plastic SOP package enabling compact SMT assembly
Applications
The LEOAC244PT is used in radiation-hardened digital bus interfaces for satellite data handling systems, aerospace payload electronics, and military avionics where AC CMOS logic switching speed and bus isolation are required. Its 3-state outputs allow multiple bus drivers to share a common data bus without contention, making it effective in spacecraft memory bus architectures and data router designs. Defense electronics designers also deploy it in backplane bus buffering where reliable 3-state control with rad-hard tolerance is mandatory.
Specifications
| YTEOL | 5 |
| Control Type | ENABLE LOW |
| Count Direction | UNIDIRECTIONAL |
| Family | AC |
| JESD-30 Code | R-PDSO-G20 |
| Load Capacitance (CL) | 50pF |
| Logic IC Type | BUS DRIVER |
| Max I(ol) | 0.024A |
| Number of Bits | 4 |
| Number of Functions | 2 |
| Number of Ports | 2 |
| Output Characteristics | 3-STATE |
| Output Polarity | TRUE |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | TSSOP20,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, THIN PROFILE, SHRINK PITCH |
| Packing Method | TR, 7 INCH |
| Peak Reflow Temperature (Cel) | NOT SPECIFIED |
| Prop. Delay@Nom-Sup | 10ns |
| Propagation Delay (tpd) | 10ns |
| Screening Level | AEC-Q100 |
| Supply Voltage-Max (Vsup) | 6V |
| Supply Voltage-Min (Vsup) | 2V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | YES |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.65mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | NOT SPECIFIED |
| Total Dose | 50k Rad(Si) V |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for LEOAC244PT:
Frequently Asked Questions
How does radiation hardening in LEOAC244PT affect its suitability for low-Earth orbit satellite bus designs?
The LEOAC244PT is radiation-hardened to tolerate the total ionizing dose and single-event upsets encountered in low-Earth orbit, where commercial AC244 bus buffers would suffer logic state corruption within months. Its hardened process ensures the 3-state outputs maintain correct logic levels across the full mission lifetime, which is critical for 8-bit data buses connecting payload processors to memory and I/O subsystems.
What output drive capability does LEOAC244PT provide, and how does this limit the number of bus loads it can drive?
The LEOAC244PT can sink up to 24 mA per output and is characterized for a 50 pF load capacitance. In a typical backplane bus application with multiple receivers, each standard CMOS load adds approximately 5 to 15 pF, allowing the buffer to drive 3 to 10 receiver inputs depending on PCB trace length and the capacitance of each downstream device's input pin.
Why is the active-low enable control on LEOAC244PT important for shared bus architectures?
The active-low enable control on LEOAC244PT places all 8 outputs into a high-impedance 3-state condition when the enable pin is deasserted high. This prevents bus contention when multiple drivers share the same 8-bit bus, allowing a bus arbiter or processor to grant bus access to one driver at a time. Correct 3-state management is especially important in rad-hard designs where a latch-up event could otherwise permanently damage bus lines.
What lifecycle risk does a YTEOL of 5 years present for programs using LEOAC244PT in satellite constellations?
A YTEOL of 5 years means the LEOAC244PT may reach end-of-life within approximately 5 years, which is shorter than many satellite mission design lifetimes of 10 to 15 years. Program managers should initiate lifetime-buy assessments immediately, identify pin-compatible rad-hard AC244 alternatives from other qualified suppliers, and coordinate with their radiation-hardened component library teams to qualify a replacement before the last order date passes.
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