Texas Instruments CD74HC4049EG4

Overview

CD74HC4049EG4 from Texas Instruments is a high-speed CMOS hex inverting buffer with level-shifting capability, supporting 15-V input down-conversion to 0–5-V logic levels while operating from a 2–6-V VCC supply. It delivers 6ns typical propagation delay at 5V/15pF, −55°C to 125°C operation, and 25mA output drive per pin - used in mixed-voltage interface translation between legacy 15-V analog subsystems and modern 5-V digital controllers.

For engineers reviewing the CD74HC4049EG4 datasheet, CD74HC4049EG4 pinout, CD74HC4049EG4 application, or CD74HC4049EG4 equivalent, key selection criteria include its verified 15-V tolerant inputs, true inverting logic function, wide temperature range, and compatibility with PDIP-16 packaging for through-hole prototyping and industrial control boards.

Technical Context

The CD74HC4049EG4 implements six independent inverting buffer stages using silicon-gate CMOS technology with a modified input protection structure that enables safe operation with input voltages up to 16V - exceeding VCC by up to 11V - while maintaining standard CMOS output swing (0V to VCC). Its architecture supports both level translation and standard buffering without external components.

It features balanced tPLH/tPHL propagation delays (≤22ns max at 6V/50pF) and transition times (≤19ns max), low input leakage (±1µA max), and high noise immunity (NIL/NIL = 30% of VCC at 5V). The device draws only 40µA quiescent current over full temperature range.

Key Specifications

Pinout & Package

CD74HC4049EG4 is supplied in a 16-pin plastic dual in-line package (PDIP), with 0.3-inch body width and standard through-hole footprint. Pin 1 is located at the top-left corner adjacent to the notch or dot marking.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar inverting level translation applications.

Compared with SN74LVX4049N and MC74HC4049AD, CD74HC4049EG4 uniquely combines 15-V input tolerance, PDIP-16 packaging, and full –55°C to 125°C qualification - making it the only drop-in solution for ruggedized through-hole industrial interface designs requiring guaranteed 16V absolute maximum input handling.

Availability

CD74HC4049EG4 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, motor drive feedback circuits, and legacy sensor integration projects requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for CD74HC4049EG4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions, with decades of heritage in high-reliability logic families including HC, HCT, and AHC series.

CD74HC4049EG4 belongs to TI's CD74HC high-speed CMOS logic family, designed specifically for robust voltage-level translation and noise-immune signal conditioning in harsh industrial and automotive environments.

FAQ

What is the maximum input voltage rating for CD74HC4049EG4?

The CD74HC4049EG4 supports an absolute maximum input voltage of 16V, with DC input voltage range specified from –0.5V to 15V. This allows direct connection to 12–15V legacy sensors, industrial switches, or analog comparators without external clamping diodes or resistive dividers - a key differentiator versus standard 5V-tolerant logic devices.

Does CD74HC4049EG4 require separate high- and low-voltage supplies for level translation?

No. CD74HC4049EG4 performs high-to-low level translation using only a single VCC supply (2–6V). Its modified input protection structure enables 15-V inputs to be safely down-converted to 0–VCC logic levels - for example, 15-V pulses become clean 0–5-V inverted outputs when VCC = 5V. No auxiliary supply or external components are needed.

Can CD74HC4049EG4 be used as a non-inverting buffer?

No. CD74HC4049EG4 contains six inverting buffers only. For non-inverting level translation, the pin-compatible CD74HC4050EG4 is required. Both share identical input voltage ratings, package options, and temperature range, but differ exclusively in logic polarity - confirmed by functional diagrams and truth tables in the official TI datasheet SCHS205I.

What is the thermal performance of CD74HC4049EG4 in PDIP packaging?

In its PDIP-16 package (designated "E"), CD74HC4049EG4 has a junction-to-ambient thermal resistance (θJA) of 67°C/W. At maximum rated power dissipation and 125°C ambient, this allows ~0.75W total device power before reaching the 150°C plastic package limit - sufficient for typical 6-channel operation at 1–5MHz with moderate capacitive loads.

Is CD74HC4049EG4 pin-compatible with other members of the '4049 family?

Yes. CD74HC4049EG4 shares identical pinout and functionality with CD54HC4049F3A (ceramic DIP), CD74HC4049M96 (SOIC), and CD74HC4049PWR (TSSOP). All variants use the same 16-pin arrangement: inputs on odd pins 1/3/5/9/11/13, outputs on even pins 2/4/6/10/12/14, GND at pin 7, VCC at pin 16, and NC at pins 8/15 - verified across TI's official package drawings and functional diagrams.