Product Overview
Dual-Tone Multi-Frequency DTMF Receiver IC DIP-18 5V
Condition
New old stock vintage inventory. Original card package with DIP-18 integrated circuit seated in protective black foam backing. IC markings show Sierra Semiconductor logo, date code 8624B, and part number SC11202CN.
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Product Overview
Archer catalog number 276-1303 is a dedicated CMOS Touch-Tone (DTMF) receiver and decoder integrated circuit packaged for Radio Shack. The internal chip is a Sierra Semiconductor SC11202CN, an industry-standard second-source equivalent to the SSI 202 device. Designed for standard telephone dual-tone decoding, it incorporates integrated switched-capacitor band-split filtering to detect 12 or 16 tone pairs directly from an analog signal line.
Key Features
- Dual-tone multi-frequency (DTMF) detection for 12 or 16 standard tone pairs
- CMOS architecture operating from a single +5V DC power supply
- Integrated front-end switched-capacitor band-split filtering eliminates external filter networks
- Selectable hexadecimal or binary-coded 2-of-8 digital logic outputs
- Requires an external 3.579545 MHz colorburst crystal reference
- Standard 18-pin dual in-line package (DIP-18)
Applications
- Bench testing, repair, or restoration of vintage telephony gear and automated call-handling units
- Adding DTMF tone remote-control capabilities to amateur radio repeaters and field transceivers
- Custom microcontroller interface projects requiring audio tone decoding without software DSP overhead
- Home automation and remote relay switching via telephone or two-way audio links
Frequently Asked Questions
Does this chip decode all 16 Touch-Tone combinations?
Yes. The IC is designed to decode both standard 12-key matrices (0-9, *, #) and the full 16-key DTMF set (including A, B, C, D tone pairs).
What operating voltage does this integrated circuit require?
This CMOS decoder operates from a single +5V DC power source.
What crystal frequency is required for timing?
It utilizes a standard 3.579545 MHz TV colorburst crystal for internal frequency reference.
Why buy this single vintage IC instead of bulk surplus lots?
You receive the exact NOS Archer piece shown in the photographs, preserved in its original branded packaging with clean pins, rather than unsorted pulls or loose lots with unverified storage history. Domestic orders ship flat-rate for $8, with free shipping on orders over $28, departing our Idaho warehouse the same or next business day.
Nothing quite matches the satisfying click of a vintage DTMF decoder locking onto a clean tone pair. Wire it up, dial in the signal, and let your legacy hardware listen.
Shipping? $8 flat rate, free once your order passes $28 - and it leaves the Idaho warehouse the same or next business day.
