Texas Instruments CD4051BE

Overview

CD4051BE from Texas Instruments is a CMOS single 8-channel analog multiplexer/demultiplexer with logic-level conversion, operating from 3V to 20V single supply or ±3V to ±10V dual supply. It features 125Ω typical ON resistance at VDD = 15V, ±10pA typical channel leakage, 0.2µW typical quiescent power dissipation, and bidirectional signal path - enabling precise analog signal routing in microcontroller-based sensor interfaces and industrial I/O systems.

For engineers reviewing the CD4051BE datasheet, CD4051BE pinout, CD4051BE application, or CD4051BE equivalent, this page delivers verified electrical specs, functional truth table mapping, real-world use cases in keypad scanning and ADC multiplexing, and validated alternative options for voltage-range-flexible analog switching designs.

Technical Context

The CD4051BE integrates a binary-to-1-of-8 decoder with inhibit logic and on-chip level-shifting circuitry, allowing digital control inputs (A/B/C/INH) to operate across the full 3V–20V supply range while switching analog signals up to 20V_P-P between V_EE and V_DD. Its CMOS transmission-gate architecture ensures symmetrical ON resistance and negligible charge injection.

Channel selection follows break-before-make timing to prevent transient shorting; propagation delay ranges from 120ns (VDD = 15V) to 720ns (VDD = 5V) for address-to-signal transitions, with input capacitance of 5pF and output capacitance of 30pF - supporting reliable operation up to 20MHz cutoff frequency in channel-ON configuration.

Key Specifications

Pinout & Package

CD4051BE is supplied in 16-pin PDIP (plastic dual in-line package), 19.3mm × 9.4mm body size, with through-hole mounting and standard 0.3-inch lead spacing.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar analog multiplexer applications.

Compared with CD4051BEE4, the CD4051BE offers identical functionality but lacks extended-temperature qualification; versus MC14051BDR2G, it delivers superior analog fidelity, wider supply flexibility, and lower power - making it optimal for precision, multi-rail, or battery-constrained systems.

Availability

CD4051BE is available at Aetrix Electronics and suitable for industrial PLCs, consumer audio systems, factory automation controllers, and portable instrumentation requiring stable component supply across long production lifecycles.

Supply support for CD4051BE 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 signal chain solutions.

The CD4051BE belongs to TI's legacy CMOS logic and analog switch portfolio, designed specifically for robust, wide-supply-range analog signal routing in industrial, automotive, and consumer equipment where reliability and voltage flexibility are critical.

FAQ

What is the maximum analog signal voltage supported by the CD4051BE?

The CD4051BE supports analog signals up to 20V_P-P, with voltage swing constrained between V_EE and V_DD. When operated on single supply (e.g., V_DD = 15V, V_SS = 0V), the analog input/output range is 0V to 15V; with dual supply (e.g., V_DD = +10V, V_EE = –10V), it spans –10V to +10V. Exceeding these limits risks latch-up or permanent damage. The CD4051BE datasheet specifies absolute maximum ratings to guide safe design margins.

Does the CD4051BE require external pull-up or pull-down resistors on its A/B/C/INH pins?

No, the CD4051BE does not require external pull-up or pull-down resistors on A, B, C, or INH pins because its CMOS inputs have extremely high impedance (±0.6µA max input current at 25°C) and defined VIH/VIL thresholds across the full 3V–20V supply range. However, floating inputs must be avoided - tie unused control pins to V_DD or V_SS to prevent undefined channel states and increased noise susceptibility. This behavior is consistent across all CD4051BE operating conditions.

Can the CD4051BE be used in a demultiplexer configuration?

Yes, the CD4051BE operates bidirectionally and functions as a demultiplexer when the COM terminal is driven as the analog input and channels 0–7 serve as outputs. In this mode, the A/B/C address lines select which channel connects to COM, distributing one input signal to eight destinations. The CD4051BE maintains identical ON resistance, leakage, and bandwidth in both directions - confirmed by its I/O pin designation and functional block diagram in the official datasheet.

What is the purpose of the VEE pin on the CD4051BE, and can it be left unconnected?

The VEE pin on the CD4051BE is the negative supply terminal required for dual-supply operation (e.g., ±5V, ±10V). It must not be left unconnected: in single-supply configurations, VEE is tied to V_SS (ground); in dual-supply setups, it connects to the negative rail. Leaving VEE floating violates absolute maximum ratings and may cause erratic switching, increased leakage, or device failure. The CD4051BE's specified performance - including ±10pA leakage and 125Ω ON resistance - assumes proper VEE biasing per the recommended operating conditions.

How does the INH (inhibit) pin affect channel selection in the CD4051BE?

The INH pin on the CD4051BE overrides all A/B/C address inputs: when INH = high (≥V_DD – 0.8V), all eight channels disconnect from the COM terminal regardless of A/B/C state, placing the device in high-impedance isolation mode. When INH = low (≤0.8V), normal 3-bit decoding resumes. This feature enables system-level fault protection, power sequencing, or synchronized channel blanking - a function explicitly documented in the CD4051BE truth table and functional description sections.