Texas Instruments CD4050BDWR

Overview

CD4050BDWR from Texas Instruments is a noninverting hex buffer IC designed for CMOS-to-TTL/DTL logic-level conversion and high-current sinking/source driving in single-supply systems. It operates from 3V to 18V, delivers ≥3.2mA sink current at VCC = 5V and TA = 25°C, features ≤0.05V output low voltage, and supports −55°C to +125°C industrial temperature range - used in mixed-voltage interface circuits between legacy TTL subsystems and modern CMOS controllers.

For engineers reviewing the CD4050BDWR datasheet, CD4050BDWR pinout, CD4050BDWR application, or CD4050BDWR equivalent, this page provides verified functional identity, confirmed SOIC-16 pin mapping, validated level-shifting capability up to 15V input with 5V supply, real-world drive strength data for two TTL loads, and cross-reference alternatives with documented functional differences.

Technical Context

The CD4050BDWR implements six independent noninverting buffer stages in a single monolithic CMOS die, each capable of translating input signals exceeding VCC (e.g., 15V inputs with 5V supply) while maintaining rail-to-rail output swing. Its input structure lacks internal clamping diodes to VCC, enabling true high-to-low level conversion without external components.

Each buffer exhibits symmetrical DC characteristics: VOH ≥ 4.95V (VCC = 5V), VOL ≤ 0.05V, IIN ≤ ±0.1µA at 18V/25°C, and propagation delays of 70–140ns (tPLH) and 55–110ns (tPHL) under standard 50pF load conditions - optimized for robust noise immunity and stable operation across wide voltage and temperature ranges.

Key Specifications

Pinout & Package

CD4050BDWR uses a 16-pin SOIC (DW) package measuring 10.30mm × 7.50mm, with standard 1.27mm pitch and surface-mount compatibility.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD4050BE and SN74HC244N, CD4050BDWR uniquely combines SOIC-16 surface-mount packaging, 3–18V operation, and 15V-input-with-5V-supply capability - making it irreplaceable in compact, mixed-voltage industrial and automotive modules requiring direct high-side signal injection.

Availability

CD4050BDWR is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control units, legacy system integration, and programmable logic interfaces requiring stable component supply across extended temperature and voltage ranges.

Supply support for CD4050BDWR 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 over 90 years of innovation in high-reliability components.

The CD4050BDWR belongs to TI's legacy CMOS logic family, engineered for robust voltage-level translation and mixed-signal interfacing in harsh environments - targeting automotive, industrial automation, and aerospace applications demanding wide supply range and extreme temperature resilience.

FAQ

What is the maximum input voltage the CD4050BDWR can accept when VCC = 5V?

The CD4050BDWR supports input voltages up to 15V with VCC = 5V, as specified in the VIH(Min) parameter table for CD4050B under VCC = 5V and VOUT = 13.5V conditions. This allows direct interfacing with higher-voltage logic families without external level-shifting components. The device achieves this using a specialized input structure that does not clamp to VCC, unlike standard CMOS buffers. Always verify actual application conditions against the Absolute Maximum Ratings to avoid damage.

Can the CD4050BDWR drive two standard TTL loads simultaneously?

Yes, the CD4050BDWR can drive two standard TTL loads per buffer. At VCC = 5V and TA = 25°C, its guaranteed output sink current (IOL) is ≥3.2mA, which exceeds the 1.6mA total required by two TTL inputs (each drawing ~0.4mA low-level input current). This capability is explicitly stated in the Applications section and confirmed in the Recommended Operating Conditions table. No external pull-up resistors or current-limiting components are needed for compliant TTL interfacing.

Is the CD4050BDWR pin-compatible with older CD4010B devices?

Yes, the CD4050BDWR is pin-compatible with the CD4010B, as confirmed in Section 7.1 of the datasheet: "CD4050B is a designated replacement for CD4010B" and "pin compatible... can be substituted for these devices in existing as well as in new designs." Both share identical 16-pin SOIC (DW) pinout, function mapping (A–F inputs, G–L outputs), and NC pin locations (13 and 16). This allows drop-in replacement without PCB modification in legacy designs.

What is the typical propagation delay of the CD4050BDWR at 5V supply?

The typical propagation delay of the CD4050BDWR at VCC = 5V is 70ns (tPLH, low-to-high) and 55ns (tPHL, high-to-low), based on the Electrical Characteristics: AC table under TA = 25°C, CL = 50pF, and VIN = 5V test conditions. These values represent median performance across production lots and are usable for timing budget calculations in synchronous digital interfaces operating below 10MHz. Delays increase at temperature extremes and higher capacitive loads.

Does the CD4050BDWR require external bypass capacitors?

Yes, the CD4050BDWR requires a 0.1µF ceramic bypass capacitor placed as close as possible to the VCC (pin 1) and VSS (pin 8) pins, as recommended in Section 8.3. This suppresses high-frequency noise and prevents supply rail collapse during output switching transitions. Without proper decoupling, the device may exhibit erratic behavior, increased propagation delay variation, or failure to meet VOL/VOH specifications - especially under heavy load or fast edge rates. Multiple capacitors (e.g., 0.1µF + 1µF) in parallel improve broadband noise rejection.