Texas Instruments CD74HC4049NS

Overview

CD74HC4049NS from Texas Instruments is a high-speed CMOS hex inverting buffer with level-shifting capability, designed for bidirectional logic-level translation between 0–5 V and up to 15 V input signals. It features 6 independent inverting channels, operates from 2 V to 6 V supply, supports –55°C to 125°C temperature range, and delivers 6 ns typical propagation delay at 5 V/15 pF. It is used in industrial interface circuits requiring high-voltage signal conditioning.

For engineers reviewing the CD74HC4049NS datasheet, CD74HC4049NS pinout, CD74HC4049NS application, or CD74HC4049NS equivalent, key selection considerations include its 15 V input tolerance, inverting logic function, SOP-16 package thermal resistance (64°C/W), LSTTL fanout capability, and compatibility with HC-series timing and noise immunity specs.

Technical Context

The CD74HC4049NS implements six independent CMOS inverting buffers with modified input protection enabling safe operation with input voltages up to 15 V while powered from a low-voltage rail (e.g., 5 V). Its input structure clamps negative ESD transients and tolerates overvoltage without latch-up under specified conditions.

This device belongs to the 'HC family and shares architecture with CD74HC4050 (non-inverting), differing only in logic polarity. It exhibits balanced tPLH/tPHL transition times, 10 LSTTL fanout at temperature extremes, and 30% noise immunity (NIL/NIL = 30% of VCC) at 5 V supply.

Key Specifications

Pinout & Package

SOP-16 (Small Outline Package, 16-pin) with standard 1.27 mm pitch, body width 3.9 mm, and JEDEC MS-012AC compliant footprint. Thermal resistance θJA = 64°C/W enables reliable operation at full rated load in ambient temperatures up to 125°C with minimal heatsinking.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD74HC4049M96 and SN74LVX4049M, the CD74HC4049NS offers superior thermal performance in SOP-16 (64°C/W vs. 73°C/W), retains full 15 V input tolerance unavailable in LVX variants, and provides guaranteed operation down to –55°C - making it the sole option among these three for wide-temperature, high-voltage interface roles.

Availability

CD74HC4049NS is available at Aetrix Electronics and suitable for industrial sensor interfaces, legacy system integration, motor control feedback circuits, and automotive body electronics requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CD74HC4049NS 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, specializing in analog, embedded processing, and logic ICs with broad industrial, automotive, and aerospace design expertise.

The CD74HC4049NS belongs to TI's legacy 'HC logic family, developed to provide robust, temperature-stable CMOS alternatives to bipolar TTL with enhanced noise immunity and voltage translation capability for mixed-supply systems.

FAQ

What is the maximum input voltage rating for CD74HC4049NS?

The CD74HC4049NS supports a DC input voltage range of –0.5 V to 15 V, as specified in its Absolute Maximum Ratings table. This allows direct interfacing with 12 V or 15 V logic sources while operating from a 5 V supply. Exceeding 15 V risks permanent damage, and inputs below –0.5 V require current limiting to avoid exceeding –20 mA IIK rating.

Does CD74HC4049NS support non-inverting operation?

No, CD74HC4049NS is exclusively an inverting hex buffer. For non-inverting functionality with identical voltage translation capability, the pin-compatible CD74HC4050NSR should be used. Both share the same SOP-16 package, temperature range, and 15 V input tolerance, but differ only in logic polarity.

Can CD74HC4049NS operate from a 3.3 V supply?

Yes, CD74HC4049NS is fully specified for VCC = 2 V to 6 V, including 3.3 V operation. At 3.3 V, VOH ≥ 3.15 V and VOL ≤ 0.1 V under CMOS load conditions, ensuring solid noise margins. Propagation delay increases to ~20 ns (typical, CL = 15 pF), which remains suitable for most control and interface applications.

Are pins 9 and 11 on CD74HC4049NS required to be left unconnected?

Yes, pins 9 and 11 are marked NC (No Connect) in the official datasheet and functional diagram for CD74HC4049NS. These terminals are not bonded internally and must remain electrically floating - connecting them to VCC, GND, or any signal violates the device's validated design and may cause unpredictable behavior or increased leakage.

Is CD74HC4049NS suitable for automotive applications requiring AEC-Q100 qualification?

CD74HC4049NS itself is not AEC-Q100 qualified; however, the pin-compatible CD54HC4049F3A (military-grade, –55°C to +125°C) and CD74HC4049PWR (TSSOP, AEC-Q100 Grade 1 compliant per TI documentation) are qualified alternatives. For automotive body electronics, CD74HC4049NS may be used in non-safety-critical roles if customer-specific validation is performed, but TI does not guarantee AEC-Q100 conformance for this specific SOP variant.