Product Overview
74AC11244NT Octal Buffer and Line Driver - AC CMOS, 3-State Outputs, 24-Pin Through-Hole DIP
Condition
Unused NOS. Sourced from an electronics distributor consolidating inventory. The photograph shows the device printed in white ink in two lines, S8745AN over 74AC11244NT, beside the Texas Instruments logo on a dark gray molded body with the pin 1 notch at one end and two round mold marks on the top face. All 24 pins are straight and evenly spaced, bright tin plating, no bent leads and no oxidation visible. No function testing has been performed - the inspection here is visual, and the photo is the spec.
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Product Overview
Texas Instruments 74AC11244NT is an octal buffer and line driver with 3-state outputs in a 24-pin plastic DIP (PDIP-24), the NT suffix confirming the through-hole package that is marked on the body in the photo. It is built on TI's EPIC (Enhanced-Performance Implanted CMOS) 1-micron process and works as one 8-bit buffer or two independent 4-bit buffers. The outputs are non-inverting and 3-state, so several devices can share a bus without fighting each other, and the center-pin VCC and GND arrangement with flow-through architecture was chosen to hold down switching noise and simplify board layout. Intended jobs are memory address drivers, clock drivers, and bus-oriented receivers and transmitters. Texas Instruments has withdrawn the part, with a last ship date of October 2016, which makes unused old stock the practical supply channel for anyone still building or repairing to it.
Key Features
- Logic family: AC (Advanced CMOS)
- Package: PDIP-24 through-hole, NT suffix
- 8 inputs, 8 outputs - non-inverting with 3-state control
- Configurable as one 8-bit buffer or two independent 4-bit buffers
- EPIC 1-micron process for high-speed switching
- Output drive: -24 mA (high) / 24 mA (low)
- Operating temperature: -40 C to 85 C
- Center-pin VCC and GND configuration to minimize switching noise
- Flow-through architecture for cleaner PCB routing
- 500 mA typical latch-up immunity at 125 C
- Input clamp diodes; balanced outputs
- Supply voltage: 4.5V to 5.5V typical operating range - not confirmed here, verify against the TI datasheet before use
- Photographed unit marked S8745AN / 74AC11244NT with the Texas Instruments logo - lot codes vary across our stock
Applications
- Board-level repair technician replacing a failed address buffer on a legacy industrial controller that still uses socketed DIP logic
- Retro computing restorer rebuilding a memory board and matching the original through-hole octal buffer rather than adapting a surface-mount part
- Hardware engineer prototyping a backplane transmitter and receiver stage on perfboard, where a 24-pin DIP is easier to probe than a fine-pitch package
- Maintenance shop stocking spares for a machine whose documentation calls out the 74AC11244 by number and cannot be requalified
Frequently Asked Questions
Is this the through-hole PDIP-24 or a surface-mount version?
Through-hole PDIP-24. The NT suffix in the marking on the body identifies the plastic DIP package, and the photo shows the two rows of 12 straight leads on 0.1 inch spacing. Surface-mount versions of this device carry other suffixes such as DW, DB, or PW.
What supply voltage does it want?
It is a 5V AC-family CMOS device in normal use. The 4.5V to 5.5V operating range is what the part family is generally cited for and is not confirmed by us - check the TI datasheet for the 74AC11244 before you design it in.
Does this buffer invert the signal?
No. The 74AC11244NT is non-inverting. If your circuit needs inversion, this is the wrong part number.
What has to happen to inputs I am not using?
Tie every unused input to VCC or GND. Floating CMOS inputs can cause erratic switching and can damage the device.
It says unused but not tested - what am I actually getting?
You are getting an unused NOS Texas Instruments 74AC11244NT out of this stock - pins straight and unoxidized, never installed and never soldered. The photo shows one representative unit from the lot rather than the specific piece reserved for you, so the lot code on yours may not read S8745AN. What we have not done is put it on a tester, so there is no functional test result behind it and no datasheet or paperwork in the package - TI's 74AC11244 datasheet is the reference document. The photo is the spec, the visual inspection is honest, and the part is old stock of a device TI stopped shipping in 2016. If a functional guarantee is what your job requires, buy it knowing that is the one thing not included here. Shipping is $8 flat rate, free once your order passes $28, and orders leave our Idaho warehouse the same or next business day.
TI put VCC and GND in the middle of this one so eight outputs could switch at once without shouting over each other, then stopped shipping it in 2016. If your board still has the 24 holes waiting, this is the buffer that was drawn for them.
