Texas Instruments CD74HC151EE4

Overview

CD74HC151EE4 from Texas Instruments is a high-speed CMOS 8-input digital multiplexer with complementary non-inverting (Y) and inverting (W) outputs, three binary select inputs (A/B/C), and active-low enable (G). It operates from 2 V to 6 V, delivers propagation delays as low as 14 ns (VCC = 4.5 V, CL = 15 pF), supports -55°C to +125°C industrial/military temperature range, and features buffered inputs/outputs with 10 LSTTL fanout. It is used in data routing, address decoding, and logic function generation within embedded control and instrumentation systems.

For engineers reviewing the CD74HC151EE4 datasheet, CD74HC151EE4 pinout, CD74HC151EE4 application, or CD74HC151EE4 equivalent, key selection considerations include its dual-output architecture, wide supply voltage range, guaranteed operation across extreme temperatures, and compatibility with both HC- and HCT-family logic families in mixed-voltage designs.

Technical Context

The CD74HC151EE4 implements a single 8:1 multiplexer using standard CMOS process technology, with fully buffered input and output stages to ensure noise immunity and drive capability. Its select logic decodes A, B, and C as a 3-bit binary address to route one of eight data inputs (D0–D7) to the Y (non-inverting) and W (inverting) outputs simultaneously.

Enable (G) is active-low and overrides all select inputs - when asserted, both outputs enter high-impedance state. Propagation delay symmetry between Y and W paths is maintained, and transition times are balanced to minimize skew in timing-critical routing applications.

Key Specifications

Pinout & Package

CD74HC151EE4 is supplied in a 16-pin plastic dual in-line package (PDIP-N), with 19.31 mm × 6.35 mm body size and through-hole mounting. Pin 1 is located at the left end of the top row, identified by a notch or dot marking.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-input multiplexer applications.

Compared with SN74HC151N and MC74HC151N, CD74HC151EE4 offers identical functionality and timing performance but carries legacy TI part marking and tube packaging optimized for manual prototyping and small-batch assembly - making it ideal for lab validation and engineering builds prior to volume production ramp.

Availability

CD74HC151EE4 is available at Aetrix Electronics and suitable for industrial data acquisition, automotive sensor interfacing, and test equipment signal routing requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for CD74HC151EE4 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 high-reliability logic families.

CD74HC151EE4 belongs to TI's CD74HC high-speed CMOS logic series, designed specifically for robust digital signal routing in mission-critical industrial, aerospace, and defense applications demanding wide temperature operation and proven long-term reliability.

FAQ

What is the maximum clock frequency supported by CD74HC151EE4?

The CD74HC151EE4 does not operate on a clock signal - it is a combinational logic device whose output responds asynchronously to input changes. Its usable data rate is governed by propagation delay: at VCC = 4.5 V and CL = 15 pF, tpd is 14 ns (typ), supporting reliable operation up to approximately 70 MHz for repetitive channel selection patterns. Actual system bandwidth depends on input slew rate, load capacitance, and PCB layout.

Can CD74HC151EE4 interface directly with 3.3 V microcontrollers?

Yes, CD74HC151EE4 supports 2 V to 6 V operation, making it fully compatible with 3.3 V logic levels. Its VIH(min) = 1.35 V and VIL(max) = 0.33 V at VCC = 3.3 V ensure unambiguous recognition of 3.3 V MCU GPIO outputs as valid HIGH/LOW signals, and its VOH(min) = 3.17 V and VOL(max) = 0.22 V meet 3.3 V input thresholds of downstream receivers.

Does CD74HC151EE4 require external pull-up or pull-down resistors on unused inputs?

Yes - all unused inputs (A, B, C, D0–D7, G) must be terminated to a defined logic level (VCC or GND) to prevent floating states that cause excessive current draw, logic glitches, or undefined output behavior. TI recommends tying unused select or data inputs to GND for predictable default channel selection and stable power consumption.

What is the purpose of the complementary W output on CD74HC151EE4?

The W output provides the logical inverse of the Y output, enabling simultaneous access to true and complemented versions of the selected data channel. This eliminates the need for an external inverter in applications requiring both polarities - such as differential signaling interfaces, XOR-based parity generation, or dual-rail logic synthesis - improving timing predictability and reducing component count.

Is CD74HC151EE4 suitable for automotive under-hood applications?

Yes - CD74HC151EE4 is rated for -55°C to +125°C operation and qualified to TI's enhanced industrial standards. While not AEC-Q100 certified, its extended temperature range, robust ESD protection (per JEDEC JESD22), and proven reliability in military-grade variants (CD54HC151) make it suitable for non-safety-critical under-hood functions like HVAC sensor aggregation or lighting control logic where full automotive qualification is not mandated.