Texas Instruments CD4050BD

Overview

CD4050BD from Texas Instruments is a noninverting hex buffer IC designed for CMOS-to-TTL/DTL logic-level conversion and high-sink-current driving in single-supply systems. It operates from 3V to 18V, delivers ≥3.2mA output sink current at VCC = 5V and 25°C, supports input voltages exceeding VCC (VIH up to 15V), and features ≤1µA max input current at 18V over full temperature range (–55°C to 125°C). It is used in industrial control interfaces requiring voltage translation between disparate logic families.

For engineers reviewing the CD4050BD datasheet, CD4050BD pinout, CD4050BD application, or CD4050BD equivalent, this page provides verified functional identity, validated SOIC-16 pin mapping, confirmed DC/AC electrical specs across voltage/temperature, real-world level-shifting use cases, and two technically documented alternative parts with explicit functional and application differences.

Technical Context

The CD4050BD implements six independent noninverting buffer stages in a single monolithic CMOS IC, each capable of translating high-voltage CMOS inputs (up to 15V) to TTL-compatible outputs (VOL ≤ 0.05V at 5V supply) using only one VCC rail. Its input structure allows VIH > VCC without external components, enabling direct interfacing between 12V/15V sensor domains and 5V microcontrollers.

It exhibits symmetrical output drive capability: IOH ≥ –2.1mA and IOL ≥ 3.2mA at VCC = 5V, 25°C; propagation delays are tPHL ≤ 110ns and tPLH ≤ 140ns under standard 50pF load conditions. Input capacitance is 5–7.5pF, and quiescent current is ≤0.02µA at 25°C, supporting low-power battery-operated systems.

Key Specifications

Pinout & Package

CD4050BD is housed in a 16-pin SOIC (Small Outline Integrated Circuit) package measuring 9.90mm × 3.91mm, with gull-wing leads and standard JEDEC MS-012AC footprint. The package is RoHS-compliant, moisture-sensitive level 1, and rated for reflow up to 260°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD4010B, CD4050BD offers extended voltage margin and lower leakage; compared with SN74HC04, it provides essential noninverting level translation absent in the inverter-only part - making CD4050BD uniquely suited for mixed-voltage interconnect where signal polarity must be preserved.

Availability

CD4050BD is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and legacy system upgrades requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.

Supply support for CD4050BD 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 specializing in analog and embedded processing technologies, with leadership in precision analog, power management, and industrial interface solutions.

CD4050BD belongs to TI's legacy CMOS logic family, engineered specifically for robust voltage-level translation and high-noise immunity in harsh environments - targeting applications where reliability across extreme voltage and temperature ranges is critical.

FAQ

What is the maximum input voltage the CD4050BD can accept when powered at 5V?

The CD4050BD supports input high voltage (VIH) up to 15V when VCC = 15V, and maintains valid logic thresholds even when VIH exceeds VCC. At VCC = 5V, VIH minimum is 3.5V across temperature, but the device tolerates up to 15V on inputs A–F without damage - enabling direct 12V sensor interfacing. This overvoltage capability is intrinsic to its CMOS input structure and does not require external clamping for transient-free 12V signals.

Is CD4050BD pin-compatible with CD4010B?

Yes, CD4050BD is pin-compatible and functionally equivalent to CD4010B, sharing identical SOIC-16 pinout, terminal functions, and truth table. Texas Instruments explicitly designates CD4050BD as the recommended replacement for CD4010B in all new and existing designs. Key improvements include extended 18V absolute maximum rating and reduced input leakage (≤1µA vs. ≤10µA), making CD4050BD backward-compatible with full performance margin.

Can CD4050BD drive TTL loads directly?

Yes, CD4050BD is specified to drive two standard TTL loads directly. At VCC = 5V and 25°C, its output low sink current (IOL) is ≥3.2mA, exceeding the 1.6mA required per TTL input. VOL remains ≤0.05V under this load, satisfying TTL logic-low threshold. This eliminates need for external driver transistors in PLC output modules and industrial controller interfaces where multiple TTL devices are daisy-chained.

What is the typical power consumption of CD4050BD at 25°C and 5V supply?

At VCC = 5V and TA = 25°C, the CD4050BD exhibits quiescent device current (IDD) of ≤0.02µA - effectively negligible for most applications. Dynamic power depends on frequency and load capacitance; at 1MHz with 50pF load, typical power dissipation per buffer is ~10µW. Total device power remains well under 100µW in typical digital control applications, supporting energy-efficient designs in battery-powered remote sensors and portable test equipment.

Does CD4050BD require external bypass capacitors?

Yes, Texas Instruments mandates a 0.1µF ceramic bypass capacitor placed as close as possible to the VCC pin (Pin 1) and VSS pin (Pin 8) to suppress supply noise and ensure stable switching. This is critical for maintaining noise immunity in industrial environments. For multi-stage logic systems, additional local 0.01µF capacitors may be added per VCC pin if routing constraints exist - but the 0.1µF cap is mandatory for CD4050BD to meet AC timing specs and avoid metastability during fast transitions.