Texas Instruments CD74HC4049PWR

Overview

CD74HC4049PWR from Texas Instruments is a high-speed CMOS hex inverting buffer with level-shifting capability, functioning as a high-to-low voltage translator (up to 15 V input) while operating from a 2–6 V supply. It delivers 6 ns typical propagation delay at 5 V/15 pF, supports –55°C to 125°C operation, and drives up to 10 LSTTL loads per output - used in industrial interface translation between legacy 15 V logic and modern 5 V microcontrollers.

For engineers reviewing the CD74HC4049PWR datasheet, CD74HC4049PWR pinout, CD74HC4049PWR application, or CD74HC4049PWR equivalent, key selection criteria include its verified 15 V tolerant inputs, rail-to-rail output swing referenced to VCC, TSSOP-16 thermal performance (θJA = 108°C/W), and compatibility with mixed-voltage system-level signal conditioning in harsh-environment control modules.

Technical Context

The CD74HC4049PWR implements six independent inverting buffer stages with modified input protection circuitry enabling safe 15 V DC input application while powered from 2–6 V. Its silicon-gate CMOS process ensures balanced rise/fall times and low quiescent current (≤40 µA over temperature).

This device operates without external biasing for level translation: input thresholds remain valid across VCC = 2–6 V, and output VOH/VOL meet CMOS and TTL load specifications simultaneously - supporting direct interfacing to both legacy high-voltage peripherals and modern low-voltage logic families.

Key Specifications

Pinout & Package

TSSOP-16 package (4.4 mm × 5.0 mm, 0.65 mm pitch), thermally rated for 108°C/W junction-to-ambient, RoHS-compliant NiPdAu lead finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar hex inverting buffer applications.

Compared with SN74LVX4049PW and CD74HC4050PWR, the CD74HC4049PWR uniquely combines 15 V input tolerance with inverting logic and 2–6 V operation - making it irreplaceable in mixed-voltage industrial interfaces requiring polarity inversion and wide supply flexibility.

Availability

CD74HC4049PWR is available at Aetrix Electronics and suitable for industrial PLC I/O interface, automotive sensor signal conditioning, military data acquisition systems, and legacy equipment retrofit requiring stable component supply across extended temperature ranges.

Supply support for CD74HC4049PWR 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.

The CD74HC4049PWR belongs to TI's High-Speed CMOS Logic family, designed specifically for robust voltage-level translation and noise-immune buffering in mixed-signal systems operating across extreme environmental conditions.

FAQ

What is the maximum input voltage rating for CD74HC4049PWR?

The CD74HC4049PWR supports a maximum DC input voltage of 15 V, as specified in its Absolute Maximum Ratings table. This allows direct connection to 12 V industrial sensors or legacy logic without external clamping. The device maintains this rating across its full operating temperature range (–55°C to +125°C) and is validated for continuous 15 V input application when powered from 2–6 V.

Does CD74HC4049PWR require external pull-up or pull-down resistors on unused inputs?

No, CD74HC4049PWR does not require external pull-up or pull-down resistors on unused inputs. Its CMOS inputs have negligible leakage (≤±1 µA at 125°C), and floating inputs are electrically stable due to internal structure. However, TI recommends tying unused inputs to VCC or GND to prevent noise-induced switching and minimize dynamic power consumption in high-noise environments.

Can CD74HC4049PWR operate from a 3.3 V supply while accepting 5 V inputs?

Yes, CD74HC4049PWR can operate from a 3.3 V supply while safely accepting 5 V inputs - and up to 15 V inputs. Its input protection architecture isolates the gate oxide from overvoltage stress regardless of VCC level. At VCC = 3.3 V, outputs swing 0–3.3 V, meeting standard CMOS logic thresholds for downstream 3.3 V devices.

Is CD74HC4049PWR pin-compatible with CD4049UB?

CD74HC4049PWR is functionally compatible but not mechanically pin-compatible with CD4049UB. While both are hex inverters with identical logic functions and pin numbering (1A–6A, 1Y–6Y, VCC, GND, NC), CD4049UB uses 16-pin PDIP or CDIP packages, whereas CD74HC4049PWR uses 16-pin TSSOP. A socket adapter or PCB redesign is required for drop-in replacement.

What is the thermal resistance (θJA) of CD74HC4049PWR in its TSSOP package?

The CD74HC4049PWR in TSSOP-16 package has a junction-to-ambient thermal resistance (θJA) of 108°C/W, as specified in the Thermal Information section of the datasheet. This value assumes standard JEDEC 2-layer board conditions (1 sq-in copper pad). For high-power-density layouts, thermal vias under the exposed pad (if present) or increased copper area can reduce effective θJA by up to 25%.