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CD4047BE Astable / Monostable Multivibrator CMOS IC — DIP-14, 3–15V, 50% Duty (5-Pack)
CD4047BE Astable / Monostable Multivibrator CMOS IC DIP-14, 3–15V, 50% Duty (5-Pack)
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CD4047BE Astable / Monostable Multivibrator CMOS IC — DIP-14, 3–15V, 50% Duty Cycle (5-Pack)
The CD4047BE is a CMOS low-power astable/monostable multivibrator IC in a DIP-14 package. In astable mode, it generates a continuous square wave with a precise 50% duty cycle using a single external R/C network. In monostable mode, it generates a single output pulse of defined width triggered by a rising or falling edge. With 3–15V supply range and complementary Q/̅Q outputs, it is widely used as the oscillator and gate driver in low-power inverter circuits, DC-AC inverters, and pulse generation applications.
Key Specifications
| Parameter | Value |
|---|---|
| Package | DIP-14 (through-hole) |
| Supply Voltage | 3V – 15V |
| Operating Modes | Astable (free-running) + Monostable (one-shot) |
| Duty Cycle (astable) | 50% (fixed, complementary Q/̅Q outputs) |
| Frequency (astable) | f ≈ 1 / (4.4 × R × C) |
| Pulse Width (monostable) | t ≈ 2.48 × R × C |
| Output Current | ±1mA (CMOS, low drive) |
| Operating Temperature | -55°C to +125°C |
| Quantity | 5 pieces |
CD4047 vs NE555 vs CD4047 — Oscillator Comparison
| Feature | CD4047BE | NE555 (astable) | CD4060 |
|---|---|---|---|
| Duty cycle | Fixed 50% | Adjustable (>50%) | 50% (with divider) |
| Complementary outputs | Yes (Q + ̅Q) | No | No |
| Supply voltage | 3–15V | 4.5–15V | 3–15V |
| Best for | 50% duty inverter driver, push-pull oscillator | Adjustable duty PWM, timer | Frequency divider chain |
Why Choose CD4047BE?
- Fixed 50% duty cycle — essential for push-pull and half-bridge inverter topologies that require equal on-time for both switches
- Complementary Q/̅Q outputs — directly drives both sides of a push-pull transformer driver without additional logic
- 3–15V supply — works from 3V battery to 12V/15V supply
- Both astable and monostable — one IC covers oscillator and one-shot timer applications
- 5-pack value — sufficient for multiple inverter and timer builds
Compatible With / Common Use Cases
- DC-AC inverter oscillator: CD4047BE astable mode at 50Hz (R=47kΩ, C=100nF) drives push-pull MOSFET stage (IRF540N) for 12V→220V inverter
- Half-bridge inverter driver: Q and ̅Q outputs drive two MOSFETs/IGBTs in complementary switching
- Ultrasonic transducer driver: 40kHz astable oscillator for ultrasonic cleaner or distance sensor
- Monostable pulse generator: One-shot pulse for debounce, delay, or trigger circuits
- Frequency generator: Adjustable frequency square wave from audio (20Hz) to ~500kHz
Frequently Asked Questions
Q: How do I calculate R and C for a 50Hz inverter oscillator with CD4047?
A: In astable mode: f = 1 / (4.4 × R × C). For f=50Hz: R × C = 1 / (4.4 × 50) = 0.00454. Choose C=100nF (0.1μF), then R = 0.00454 / 0.0000001 = 45.4kΩ. Use 47kΩ standard value for ~48Hz, or 43kΩ for ~52Hz. Fine-tune with a trimmer potentiometer in series with R.
Q: Can CD4047BE directly drive MOSFET gates for an inverter?
A: CD4047BE output current is only ~1mA (CMOS), insufficient to drive MOSFET gates directly at high frequency. Use a gate driver IC (IR2104S, TC4420, UCC27524) or a totem-pole buffer (two BC547/BC557 transistors) between CD4047 outputs and MOSFET gates. For low-frequency (50–60Hz) inverters with small MOSFETs (<10nC gate charge), direct drive may work at reduced switching speed.
Q: What is the maximum frequency for CD4047BE?
A: CD4047BE can oscillate up to approximately 1–2MHz at 15V supply. At 5V, maximum reliable frequency is ~500kHz. For audio and ultrasonic frequencies (20Hz–100kHz), CD4047BE is fully adequate. For higher frequencies, use a dedicated oscillator IC (74HC14 RC oscillator, Si5351 PLL).
Package Contents
- 5× CD4047BE Astable/Monostable Multivibrator CMOS IC (DIP-14)
- ★Product Description
- ★About us
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CD4047BE Astable / Monostable Multivibrator CMOS IC — DIP-14, 3–15V, 50% Duty Cycle (5-Pack)
The CD4047BE is a CMOS low-power astable/monostable multivibrator IC in a DIP-14 package. In astable mode, it generates a continuous square wave with a precise 50% duty cycle using a single external R/C network. In monostable mode, it generates a single output pulse of defined width triggered by a rising or falling edge. With 3–15V supply range and complementary Q/̅Q outputs, it is widely used as the oscillator and gate driver in low-power inverter circuits, DC-AC inverters, and pulse generation applications.
Key Specifications
| Parameter | Value |
|---|---|
| Package | DIP-14 (through-hole) |
| Supply Voltage | 3V – 15V |
| Operating Modes | Astable (free-running) + Monostable (one-shot) |
| Duty Cycle (astable) | 50% (fixed, complementary Q/̅Q outputs) |
| Frequency (astable) | f ≈ 1 / (4.4 × R × C) |
| Pulse Width (monostable) | t ≈ 2.48 × R × C |
| Output Current | ±1mA (CMOS, low drive) |
| Operating Temperature | -55°C to +125°C |
| Quantity | 5 pieces |
CD4047 vs NE555 vs CD4047 — Oscillator Comparison
| Feature | CD4047BE | NE555 (astable) | CD4060 |
|---|---|---|---|
| Duty cycle | Fixed 50% | Adjustable (>50%) | 50% (with divider) |
| Complementary outputs | Yes (Q + ̅Q) | No | No |
| Supply voltage | 3–15V | 4.5–15V | 3–15V |
| Best for | 50% duty inverter driver, push-pull oscillator | Adjustable duty PWM, timer | Frequency divider chain |
Why Choose CD4047BE?
- Fixed 50% duty cycle — essential for push-pull and half-bridge inverter topologies that require equal on-time for both switches
- Complementary Q/̅Q outputs — directly drives both sides of a push-pull transformer driver without additional logic
- 3–15V supply — works from 3V battery to 12V/15V supply
- Both astable and monostable — one IC covers oscillator and one-shot timer applications
- 5-pack value — sufficient for multiple inverter and timer builds
Compatible With / Common Use Cases
- DC-AC inverter oscillator: CD4047BE astable mode at 50Hz (R=47kΩ, C=100nF) drives push-pull MOSFET stage (IRF540N) for 12V→220V inverter
- Half-bridge inverter driver: Q and ̅Q outputs drive two MOSFETs/IGBTs in complementary switching
- Ultrasonic transducer driver: 40kHz astable oscillator for ultrasonic cleaner or distance sensor
- Monostable pulse generator: One-shot pulse for debounce, delay, or trigger circuits
- Frequency generator: Adjustable frequency square wave from audio (20Hz) to ~500kHz
Frequently Asked Questions
Q: How do I calculate R and C for a 50Hz inverter oscillator with CD4047?
A: In astable mode: f = 1 / (4.4 × R × C). For f=50Hz: R × C = 1 / (4.4 × 50) = 0.00454. Choose C=100nF (0.1μF), then R = 0.00454 / 0.0000001 = 45.4kΩ. Use 47kΩ standard value for ~48Hz, or 43kΩ for ~52Hz. Fine-tune with a trimmer potentiometer in series with R.
Q: Can CD4047BE directly drive MOSFET gates for an inverter?
A: CD4047BE output current is only ~1mA (CMOS), insufficient to drive MOSFET gates directly at high frequency. Use a gate driver IC (IR2104S, TC4420, UCC27524) or a totem-pole buffer (two BC547/BC557 transistors) between CD4047 outputs and MOSFET gates. For low-frequency (50–60Hz) inverters with small MOSFETs (<10nC gate charge), direct drive may work at reduced switching speed.
Q: What is the maximum frequency for CD4047BE?
A: CD4047BE can oscillate up to approximately 1–2MHz at 15V supply. At 5V, maximum reliable frequency is ~500kHz. For audio and ultrasonic frequencies (20Hz–100kHz), CD4047BE is fully adequate. For higher frequencies, use a dedicated oscillator IC (74HC14 RC oscillator, Si5351 PLL).
Package Contents
- 5× CD4047BE Astable/Monostable Multivibrator CMOS IC (DIP-14)
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