Texas Instruments CD4049UBE-NG

Overview

CD4049UBE-NG from Texas Instruments is a CMOS hex inverting buffer IC designed for high-sink-current logic-level conversion, featuring six independent inverting gates with input voltage tolerance exceeding V_CC, 3.3 mA output sink current at 5 V, 1 µA max input current at 18 V over full temperature range (–55°C to 125°C), and operation from 3 V to 18 V supply. It enables CMOS-to-TTL/DTL interfacing in industrial control signal conditioning.

For engineers reviewing the CD4049UBE-NG datasheet, CD4049UBE-NG pinout, CD4049UBE-NG application, or CD4049UBE-NG equivalent, this page delivers verified electrical specs, package mapping to PDIP-16, functional pin roles, real-world use cases in level-shifting and TTL driving, and two validated alternative parts with documented differences.

Technical Context

The CD4049UBE-NG implements six identical CMOS inverter stages with symmetrical output drive capability, supporting single-supply operation where input high-level voltage (V_IH) may exceed V_CC-enabling high-to-low logic translation without external biasing. Its architecture avoids internal clamp diodes to V_CC, permitting safe overvoltage input handling up to 20 V absolute maximum.

Each gate delivers ≥3.2 mA sink current at V_CC = 5 V and T_A = 25°C (V_OL ≤ 0.05 V), while maintaining ≤1 µA input leakage across –55°C to 125°C at 18 V. Propagation delays are asymmetrical: t_PHL = 15–32 ns (high-to-low) and t_PLH = 25–60 ns (low-to-high) depending on supply and load conditions.

Key Specifications

Pinout & Package

CD4049UBE-NG is supplied in a 16-pin plastic dual in-line package (PDIP, N package), measuring 6.35 mm × 19.30 mm, with through-hole mounting and industry-standard lead pitch (2.54 mm).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD4009UBM and MC14504BD, CD4049UBE-NG uniquely combines single-supply inverting operation, input overvoltage tolerance, and TTL-driving sink current - making it irreplaceable in applications requiring polarity inversion across mixed-voltage domains.

Availability

CD4049UBE-NG is available at Aetrix Electronics and suitable for industrial sensor interfaces, legacy TTL system integration, high-voltage microcontroller peripherals, and power supply sequencing control requiring stable component supply across extended temperature ranges.

Supply support for CD4049UBE-NG 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 CMOS technology development and industrial-grade component qualification.

The CD4049UBE-NG belongs to TI's legacy CD4000-series CMOS logic family, engineered specifically for robust, wide-supply-voltage digital interfacing in harsh environments where reliability, temperature resilience, and voltage translation are critical.

FAQ

What is the maximum input voltage allowed on CD4049UBE-NG inputs when V_CC = 5 V?

The CD4049UBE-NG permits input voltages up to 20 V absolute maximum, regardless of V_CC level. At V_CC = 5 V, inputs may safely accept up to 15 V high-level signals per the VIH(Min) specification - enabling direct interfacing with higher-voltage CMOS domains without external components. This overvoltage tolerance is intrinsic to its design and does not require clamping diodes.

Can CD4049UBE-NG drive standard 74LS TTL inputs directly?

Yes, CD4049UBE-NG can drive two 74LS TTL inputs per channel. At V_CC = 5 V and T_A = 25°C, it delivers ≥3.2 mA sink current with V_OL ≤ 0.05 V - exceeding the 74LS input requirement of 0.4 V max low-level voltage and 0.4 mA max sink current. This eliminates need for external pull-down resistors or transistor buffers in TTL interface designs.

Is CD4049UBE-NG pin-compatible with CD4009UBM?

Yes, CD4049UBE-NG is pin-compatible with CD4009UBM in the same PDIP-16 package. Both share identical pin numbering and terminal functions (V_CC, V_SS, six I/O pairs, and NC pins). However, CD4049UBE-NG operates on a single supply and supports input voltages exceeding V_CC, whereas CD4009UBM requires dual supplies and lacks overvoltage tolerance - making CD4049UBE-NG a functional upgrade with no PCB changes required.

What is the typical propagation delay of CD4049UBE-NG at 10 V supply?

At V_CC = 10 V and T_A = 25°C, CD4049UBE-NG exhibits t_PHL = 20 ns (high-to-low) and t_PLH = 32 ns (low-to-high) typical propagation delays into 50 pF load. These values reflect its asymmetrical CMOS output stage design optimized for fast falling edges - critical for clock distribution and timing-critical control signals in industrial systems.

Does CD4049UBE-NG require external pull-up or pull-down resistors on unused inputs?

Yes, all unused inputs on CD4049UBE-NG must be externally tied to either V_CC or V_SS - floating CMOS inputs cause undefined output states and increased power consumption due to partial conduction in internal transistors. TI explicitly recommends this practice in the datasheet to ensure stable operation across –55°C to 125°C and prevent latch-up or oscillation in unused channels of the CD4049UBE-NG.