CD4049AE - Hex CMOS Buffer/Converter, 3-18V | Harris
MPN: CD4049AE ✓ ActiveCD4049AE Overview
A CMOS buffer or converter is a logic IC that isolates a source from a driven load while providing compatible voltage levels. In the device hierarchy, CD4049AE belongs to the CMOS logic family, with the broader categories of digital logic, integrated circuit, and semiconductor. Its wide supply-voltage range allows use in systems operating from low-voltage 3 V rails through traditional 18 V CMOS rails, although operating points must remain within the limits stated in the manufacturer datasheet.
The CD4049AE is described as a hex inverting/non-inverting buffer converter. Its primary advantages are flexible supply-voltage operation and the availability of multiple channels in one package. Because the AE package is a through-hole 16-pin DIP, it is appropriate for legacy industrial equipment, prototypes, repair assemblies, and control systems where surface-mount components would require a different physical footprint.
The CD4049 family is frequently considered when a logic signal must drive another circuit with a different input voltage requirement or when a signal source needs buffering. Input and output rise and fall times, propagation delay, output drive current, input leakage, and noise margins must be checked against the actual clock rate, load capacitance, supply voltage, and logic thresholds of the connected devices. The CD4049AE should not automatically be treated as a general-purpose level shifter for every interface.
Typical uses include industrial control logic, legacy instrumentation, display and interface control, signal conditioning between CMOS stages, and repair of systems originally designed around the CD4000 family. In these applications, the six buffered channels can reduce loading on sensitive logic outputs while maintaining compatible supply-domain operation.
When designing around the CD4049AE, begin with the manufacturer datasheet and confirm the exact pinout, input/output logic behavior, absolute maximum ratings, and timing limits for the relevant revision. Check that every connected signal remains within the permitted input-voltage range, that unused inputs are tied to a defined logic level, and that unused outputs are left unconnected unless the datasheet permits otherwise. Supply bypassing and breadboard or PCB layout quality also matter because long connections and high-impedance nodes can increase noise susceptibility and transition-time distortion.
This page combines verified distributor sourcing information, the referenced CD4049 family description, package details, structured engineering guidance, and clearly marked data gaps. It is intended to help engineers identify the CD4049AE quickly while separating confirmed facts from parameters that must be obtained from the official manufacturer datasheet before design release.
Drop-in alternatives for CD4049AE — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
CD4049UBE
✅ Drop-In📋 Reference alternative (not in catalog)
CD4049AE Maximum Ratings & Electrical Characteristics
| Product Type | Hex inverting/non-inverting buffer and logic-level converter |
| Supply Voltage Range | 3 V to 18 V |
| Maximum Supply Voltage | 18 V |
| Logic Family | CD4000 CMOS series |
| Number of Buffer Channels | 6 channels |
| Package | 16-pin DIP (16DIP) |
| Mounting Type | Through-hole |
CD4049AE 16-pin dip (16dip) Pin Configuration Guide
Pin configuration for CD4049AE (16-pin dip (16dip) package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for CD4049AE.
Refer to the datasheet for full pin configuration.
Typical Applications
CD4049AE is suitable for 6 applications: Legacy Industrial Control Logic, CMOS Logic-Level Conditioning, Instrumentation Signal Conditioning, Display and Interface Control, Repair of CD4000-Series Equipment, Audio Control Signal Buffering.
Legacy Industrial Control Logic
The CD4049AE fits legacy industrial control boards because it combines six CMOS buffer channels with a 3 V to 18 V supply range in a 16-pin DIP package. It can be placed between a control latch or counter and a driver stage to reduce loading when the original system used CD4000-series logic. Before schematic release, verify the exact pinout, output-current capability, and propagation delay against the manufacturer datasheet, because these parameters were not included in the supplied data.
Recommended
CMOS Logic-Level Conditioning
The CD4049AE is applicable to CMOS logic-level conditioning because it is identified as a hex buffer converter with a 3 V to 18 V operating range. A buffered channel can isolate a source from a load and accommodate compatible logic thresholds within that supply domain. The device should not be assumed to translate arbitrary TTL, 1.8 V, and 5 V domains; confirm input thresholds, permitted input voltages, output levels, and speed for the exact system before using it as a general level shifter.
Recommended
Instrumentation Signal Conditioning
The CD4049AE can condition compatible digital control signals in legacy instrumentation where the original design relies on 18 V CMOS devices. Its six channels provide separate buffering points for measurement-control, alarm, mode-select, or actuator-enable signals. Because the verified material does not provide noise, timing, or output-drive figures, engineers must evaluate fanout, capacitance, propagation delay, and noise margin in the actual instrument rather than treating the broad 3 V to 18 V range as a complete interface specification.
Recommended
Display and Interface Control
The CD4049AE is suitable for older display and interface control boards that operate from traditional CMOS supplies. Its six buffered outputs can provide separate drive paths for display-enable, latch-control, mode, and status signals while reducing the burden on an upstream counter or microcontroller. The exact channel functions and pin assignments require the official datasheet. Engineers should also verify output rise and fall times against display and transceiver input capacitance to avoid ringing or incomplete transitions.
Recommended
Repair of CD4000-Series Equipment
The CD4049AE is appropriate for repairing or extending equipment originally built around the CD4000 CMOS family because its 16-pin DIP package supports through-hole maintenance and replacement strategies. The verified distributor listing confirms the Harris Corporation origin and 16DIP format, while the family information confirms a 3 V to 18 V range. Repair engineers should compare the failed device marking, socket orientation, supply voltage, and signal timing with the official datasheet, and should investigate systematic failures rather than assuming every symptom indicates a failed buffer.
Recommended
Audio Control Signal Buffering
The CD4049AE can buffer compatible control signals in older audio equipment where the circuit uses CMOS logic to coordinate mode, bypass, relay, or channel-selection functions. Buffering reduces loading on the originating counter or latch, while the 3 V to 18 V supply range supports legacy rails. It does not directly provide low-noise audio amplification; its benefit is control-signal isolation. Verify switching edges, output drive, ground return paths, and any noise coupling into nearby analog stages before production use.
Recommended
Recommended Products Summary
Engineering reference data for CD4049AE — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | CD4049UBE |
|---|---|---|
| Manufacturer | Harris Corporation | Harris Corporation |
| Package | 16-pin DIP (16DIP) | 16-pin DIP (16DIP) |
| Product Function | Hex inverting/non-inverting buffer and converter | Hex buffer converter, unbuffered version |
| Supply Voltage Range | 3 V to 18 V | 3 V to 18 V |
| Number of Channels | 6 channels | 6 channels |
| Buffering | Buffered | Unbuffered |
Key Differentiators
- Buffered implementation for legacy interface designs (vs CD4049UBE)
- Direct 16-pin DIP heritage-package support (vs CD4049UBE)
- Broad CMOS supply compatibility (vs CD4049UBE)
Design Notes
Do not substitute CD4049UBE for CD4049AE without checking the original timing and loading requirements. The verified alternatives discussion identifies CD4049UBE as unbuffered, while CD4049AE is a buffered converter. A different drive stage and propagation delay can alter edge behavior in a feedback or synchronizing circuit. Verify the pin arrangement, propagation delay, output current, and transition times against the applicable manufacturer datasheet.
Confirm that the selected supply voltage is between 3 V and 18 V and that every input remains within the CD4049AE input-voltage limits. Do not assume the buffer can safely accept signals above its supply rail. Review absolute maximum ratings, input leakage, quiescent current, and output dissipation in the official datasheet. Place the supply bypass capacitor close to the device pins and maintain a low-impedance return path.
Check output rise and fall times against the capacitance of the receiving gate, cable, display, or driver. Long traces can add propagation delay and ringing, especially in legacy 18 V systems. When substituting parts, compare transition-time and propagation-delay limits at the intended supply voltage rather than comparing nominal catalog values. High-impedance unused inputs must be tied to a defined state according to the datasheet.
Use the 16-pin DIP footprint and verify socket orientation, notch position, and pin-1 marking before assembly. In repair designs, inspect sockets for oxidized contacts and confirm that a replacement device is electrically seated rather than relying only on visual alignment. Maintain conventional logic-layout practices by keeping supply and ground connections short and avoiding long parallel routes between noisy switching nodes and buffer inputs.
Compliance Information
The supplied verified search results do not contain an explicit RoHS, REACH, lead-free, halogen-free, or conflict-minerals declaration. The device is a general-purpose logic IC rather than an automotive-qualified product, so AEC-Q100 is recorded as not applicable.
