Product Overview
Texas Instruments SN7447N TTL BCD-to-7-Segment Decoder / Driver IC DIP-16
Condition
Unused new old stock (NOS). Markings legible: Texas Instruments logo, SN7447N. Straight factory pins with clean body molding.
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Product Overview
Texas Instruments SN7447N BCD-to-7-segment decoder and driver in a standard 16-pin plastic dual in-line package (DIP-16). Designed to accept 4-bit binary-coded decimal inputs and drive common-anode 7-segment LED displays directly via active-low open-collector outputs.
Key Features
- Standard TTL logic family operating from a nominal 5.0V supply
- Active-low open-collector outputs rated up to 15V breakdown voltage
- 40 mA low-level output sink current capacity per segment
- Includes Lamp Test (LT), Blanking Input / Ripple-Blanking Output (BI/RBO), and Ripple-Blanking Input (RBI) functions
- Standard 16-pin dual in-line package (DIP-16) with 0.1-inch lead spacing
Applications
- Bench repair and restoration of vintage test equipment, frequency counters, and digital panel meters
- Retro computing and vintage arcade board logic repairs
- Driving common-anode LED digital displays in hobby breadboards and microcontroller projects
Frequently Asked Questions
Does the SN7447N require external current-limiting resistors?
Yes. The open-collector outputs sink current from an external voltage rail through the display segments, requiring series current-limiting resistors sized for your display voltage and desired LED current.
Can this IC directly drive common-cathode displays?
No. The SN7447N features active-low outputs designed specifically for common-anode displays. Common-cathode displays require an active-high driver such as the 7448.
What display segments does one SN7447N chip drive?
One chip provides the seven outputs needed to decode and drive a single numeric 7-segment digit. Multi-digit readouts require one decoder per digit.
Few things capture the classic glow of early digital electronics quite like a 7447 pulling current through vintage common-anode red LED digits. Drop it into your socket, tie the lamp test high, and watch the segments snap right into line.
