Product Overview
Signetics 1447-3557 Triple 3-Input AND Gate DIP-14 IC
Condition
Used condition. Package shows minor cosmetic wear consistent with handling and vintage storage. Markings on body legible: Signetics logo, 7145 date code, 1447, and 3557. Evaluation: Visual inspection only. Function testing not performed.
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Product Overview
This Signetics 1447-3557 is a vintage high-speed TTL triple 3-input positive-AND gate housed in a standard 14-pin dual in-line package (DIP-14). Manufactured in late 1971 (date code 7145), this component carries Burroughs Corporation OEM house numbering and serves as a direct functional equivalent to the standard 74H11 and SN74H11N logic integrated circuits. It provides high-speed TTL switching for vintage computing architectures, legacy logic card maintenance, and retro-electronics restoration.
Key Features
- Triple 3-input positive-AND gate logic configuration
- High-speed TTL logic family (74H series)
- Standard 5.0V nominal logic supply voltage
- 14-pin dual in-line package (DIP-14)
- Direct equivalent to industry-standard 74H11, N74H11A, and SN74H11N
- Marked with 1971 vintage date code (7145) and Burroughs part number 1447-3557
Applications
- Replacing failed 74H11 or Burroughs 1447-3557 logic ICs on mainframe or vintage computer processor boards
- Maintaining legacy industrial control boards requiring period-accurate high-speed TTL components
- Bench prototyping and retro-computing hobbyist builds requiring genuine early 1970s discrete logic
Frequently Asked Questions
What logic function does the 1447-3557 perform?
The 1447-3557 contains three independent 3-input positive-AND gates, operating as a functional equivalent to standard 74H11 / SN74H11N logic.
What do the top markings indicate?
The top face bears the vintage Signetics logo, date code 7145 indicating production in the 45th week of 1971, and Burroughs house part number 1447-3557.
Why buy this specific vintage pull instead of hunting through unsorted lots?
Vintage computer repairs stall when an exact house-coded part is buried in bulk untested scrap. Buying this specific, individually photographed unit gives you the exact component you see on the bench without gambling on unverified grab bags. Orders ship flat-rate at $8 or free once your total passes $28, departing our Idaho warehouse the same or next business day.
Real early-70s silicon built to drive mainframe logic - ready to plug into the socket and put an old machine back on the clock.
