CD4033 CMOS Decade Counter Divider
The CD4033B is part of the 4000-series CMOS logic family, offering a self-contained counter and 7-segment decoder suitable for direct interfacing with common‑cathode numeric displays. It handles decimal counting from 0–9 and simplifies circuit design by eliminating external drivers.
With a wide operating voltage range (3–18 V) and ultra-low quiescent current (under 1 µA typical), it’s ideal for battery- or panel-powered displays. The CD4033B also includes ripple-blanking capability to suppress leading zeros and a lamp test input for full-digit display checks.
🛠 Technical Details
| Specification | Details |
|---|---|
| Core Function | 5‑stage Johnson counter + 7‑segment decoder |
| Supply Voltage (VDD) | 3 V – 18 V (Supports 5 V, 10 V, 15 V ranges) |
| Max Clock Frequency | ≈ 6 MHz at VDD = 10 V |
| Output Type | Push‑pull segment outputs (a–g) |
| Auxiliary Signals | RESET, CLOCK INHIBIT, R‑BLANK IN/OUT, LAMP TEST, CARRY‑OUT |
| Current Draw | < 1 µA typical at 18 V |
| Package Types | DIP‑16, SOP‑16 CMOS |
| Operating Temperature | –55 °C to +125 °C (JEDEC standard) |
| Clock Input | Schmitt-triggered for clean transitions |
💡 Use Cases & Applications
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🔢 Single‑digit decimal displays: Drive “0–9” presentation with minimal external components.
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⏱ Frequency dividers or counters: Useful in time‑display panels or meter readouts.
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🏁 Cascaded displays: Use CARRY‑OUT to chain multiple CD4033s for multi‑digit counters.
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🔄 Ripple-blanking: Suppresses leading zeros in multi‑digit displays for cleaner visuals.
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🧠 Educational logic circuits: Helps demonstrate Johnson counters, display decoding, and ripple chaining effects.
🛠️ Pair With
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🌐 Use with Electronics Components such as display modules and pull‑up resistors
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🛠 Combine with Tools & Accessories like breadboards, test probes, and logic analyzers
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⚡ Power from Power Supply Modules providing stable 5 V or 12 V rails
🎥 YouTube Tutorial
📺 CD4033 7 segment counter tutorial
⚠️ Precautions & Tips
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Ensure you use a common‑cathode display, as CD4033 sink current ability is limited (typical ≈5 mA)—still sufficient for modern low‑current LEDs.
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Keep input signals stable; tie unused control pins (e.g., RESET, INHIBIT, LAMP TEST) to defined logic levels to avoid erratic counting.
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For multi-digit setups, link CARRY‑OUT → CLOCK of next chip and manage ripple‑blanking (RBO/RBI) to suppress leading zeros cleanly.
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Stick within rated supply range—higher voltages increase drive but don’t exceed absolute maximum of 20 V.
🏁 Summary & Call‑to‑Action
The CD4033B CMOS decade counter/driver offers a compact, reliable way to add numeric display capability to your project with minimal wiring. Built‑in blanking and test logic, low power consumption, and CMOS voltage tolerance make it a reliable choice for digital instrumentation, display counters, and educational demonstrations.
🛒 Available now at Electroway — your source for dependable display counter logic ICs.
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