Texas Instruments CD4050BDW

Overview

CD4050BDW 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 ≥24mA sink current at 15V/25°C, maintains VOH ≥14.95V and VOL ≤0.05V under full temperature range (–55°C to 125°C), and supports direct drive of two TTL loads - used in industrial control I/O interfacing and mixed-voltage sensor signal conditioning.

For engineers reviewing the CD4050BDW datasheet, CD4050BDW pinout, CD4050BDW application, or CD4050BDW equivalent, key selection criteria include its noninverting logic function, 16-pin SOIC-DW package with NC pins at 13 and 16, input voltage tolerance up to VCC, and verified performance across 5V/10V/15V supply rails with low quiescent current (≤0.04µA at 25°C, 20V).

Technical Context

The CD4050BDW implements six independent noninverting buffer stages in a single monolithic CMOS die, each with symmetrical output drive capability and rail-to-rail voltage transfer characteristics. Its input structure allows VIH up to VCC without clamping, enabling safe high-to-low level translation when VCC is lower than input signal voltage.

It features standardized DC electrical behavior across –55°C to 125°C, including IIN ≤±0.1µA at 18V/–55°C and IOH ≥–4.3mA at 15V/25°C, with propagation delays tPLH/tPHL ranging from 30ns to 140ns depending on supply and input voltage conditions.

Key Specifications

Pinout & Package

CD4050BDW uses a 16-pin SOIC-DW package (10.30mm × 7.50mm), with pin 1 = VCC, pin 8 = VSS, pins 13 and 16 = NC (no internal connection), and six independent input/output pairs (A/G, B/H, C/I, D/J, E/K, F/L).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD4050BE and MC74HC04ADWG, CD4050BDW uniquely combines noninverting logic, 3–18V operation, 24mA sink capability, and SOIC-DW packaging - making it irreplaceable in mixed-voltage industrial interfacing where pin compatibility, voltage translation, and drive strength are jointly required.

Availability

CD4050BDW is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, mixed-voltage sensor signal conditioning, and legacy equipment interface adapters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CD4050BDW 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 for industrial, automotive, and communications markets.

CD4050BDW belongs to TI's legacy CMOS logic family, engineered for robustness in high-voltage, wide-temperature industrial interfacing - emphasizing reliability, single-supply operation, and direct TTL/DTL load driving without external components.

FAQ

What is the maximum input voltage allowed on CD4050BDW inputs?

The CD4050BDW input voltage must not exceed VCC. Although the device supports logic-level conversion where input signals may be higher than VCC in certain configurations, the absolute maximum rating specifies VI ≤ VCC. Exceeding VCC risks forward-biasing internal clamp diodes and damaging the input stage. For 15V-level translation, set VCC = 15V and ensure inputs stay ≤15V - confirmed in Section 5.1 Absolute Maximum Ratings and Figure 6-4 application circuit.

Can CD4050BDW drive two standard TTL loads simultaneously?

Yes, CD4050BDW can drive two standard TTL loads. Per datasheet Section 3 and Recommended Operating Conditions, it delivers ≥3.2mA sink current at VCC = 5V/25°C and ≥24mA at VCC = 15V/25°C - exceeding the 16mA total (8mA per load) required for two TTL inputs. This is validated in Figure 5-3 and Table 5.3, confirming direct TTL interfacing without external drivers.

Is CD4050BDW pin-compatible with CD4010B?

Yes, CD4050BDW is pin-compatible with CD4010B. Section 7.1 Overview explicitly states: "CD4050B is designated as replacement for CD4010B" and "pin compatible … can be substituted for these devices in existing as well as new designs." Pin numbering, function mapping (A/G, B/H, etc.), and NC pin locations (13, 16) match identically - enabling drop-in replacement without PCB changes.

What is the typical propagation delay of CD4050BDW at 5V supply?

At VCC = 5V and TA = 25°C, CD4050BDW exhibits tPLH = 70–140ns and tPHL = 55–110ns (Section 5.6 Electrical Characteristics: AC). The typical values are 105ns (tPLH) and 82.5ns (tPHL), defining a worst-case channel delay of 140ns - sufficient for ≤3.3MHz operation in a single-buffer configuration, as verified in Figure 5-9 power-vs-frequency curves.

Does CD4050BDW require external pull-up or pull-down resistors on unused inputs?

Yes, all unused inputs on CD4050BDW must be externally biased to VCC or VSS. Section 8.4.1 Layout Guidelines mandates this to prevent floating nodes, which cause undefined logic states, increased power consumption, and potential latch-up. Leaving inputs unconnected violates CMOS design rules - confirmed in Figure 8-4 layout example and Section 7.4 functional mode tables requiring defined input levels.