CD4047BK

Overview

The CD4047BK is a CMOS monostable/astable multivibrator from the 4000 series, manufactured by Harris Corporation. It operates within a supply voltage range of 3 V to 18 V and supports an operating temperature range of -55 °C to +125 °C. The device features complementary outputs (Q and Q-bar) and includes inputs for astable mode selection, positive/negative edge triggering, external reset, and retriggering capabilities. It utilizes external resistors and capacitors connected to REXT and CEXT pins to define timing intervals in both operational modes.

Feature Summary

• Supports both free-running astable and gated astable operation modes via dedicated control inputs.
• Provides positive and negative edge-triggered monostable functionality with independent trigger inputs.
• Includes a retriggerable input allowing pulse extension during the output timing interval.
• Delivers complementary square wave outputs at Q and Q terminals.

Applications

• Timing circuits requiring precise pulse width generation
• Frequency division and waveform generation systems
• Digital clock signal sources using astable configuration

Procurement Notes

Verify the manufacturer origin as Harris Corporation, noting that this entity has undergone corporate restructuring. Confirm the package type matches the required footprint, typically ceramic dual-in-line for the BK suffix. Ensure compatibility with the 4000 series logic family voltage levels and check for RoHS compliance status relative to current manufacturing standards.

Selection Notes

Select this component when a single-channel multivibrator with both monostable and astable capabilities is required. It is suitable for designs needing wide supply voltage flexibility and high-temperature operation. Consider the complementary output availability if phase-inverted signals are necessary without additional inverters.

Part Context

The CD4047BK belongs to the standard 4000 series CMOS logic family, widely used in general-purpose digital electronics. Harris Corporation produced this variant before its semiconductor assets were acquired by other entities. The part remains a fundamental building block for analog-digital interface timing applications due to its low power consumption and robust noise margins typical of CMOS technology.

Replacement Considerations

Direct substitutes include the CD4047BE or CD4047BEE4 from Texas Instruments, which share identical pinouts and electrical characteristics. Other compatible alternatives may include variants from Renesas or STMicroelectronics within the same 4000 series lineage, provided the package style and temperature ratings align with the design requirements.