Texas Instruments CD74HC258M

Overview

CD74HC258M from Texas Instruments is a high-speed CMOS quad 2-input multiplexer with 3-state outputs, designed for data routing in digital logic systems. It operates at supply voltages from 2V to 6V, supports propagation delay of 19 ns (at VCC = 4.5 V), and features low power consumption (8 µA typical ICC). It is commonly used in address/data bus selection and signal gating in industrial control logic.

For engineers reviewing the CD74HC258M datasheet, CD74HC258M pinout, CD74HC258M application, or CD74HC258M equivalent, key selection criteria include its 3-state output enable control, rail-to-rail input compatibility, TTL-compatible input thresholds, and guaranteed AC/DC performance across the full 2V–6V supply range.

Technical Context

The CD74HC258M implements four independent 2:1 multiplexers sharing a common output-enable (OE) input. Each channel selects between two inputs (I0, I1) based on a single select line (S), with outputs placed in high-impedance state when OE is high. Its HC-family silicon ensures compatibility with both CMOS and TTL logic families.

It uses standard silicon-gate CMOS technology, delivering symmetrical output drive capability (±5.2 mA at VCC = 4.5 V), noise immunity exceeding 1 V (at VCC = 4.5 V), and operation over the full −55°C to +125°C military temperature range. No internal pull-ups or latching is present - all inputs are static CMOS.

Key Specifications

Pinout & Package

CD74HC258M is housed in a 16-pin plastic dual in-line package (PDIP) with 0.3-inch body width and standard through-hole footprint.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad 2:1 multiplexer applications.

Compared with SN74HC157N and CD74HCT258E, the CD74HC258M uniquely combines full military temperature range, wide 2V–6V supply support, and guaranteed 3-state timing - making it the only option qualified for high-reliability, multi-voltage, and extended-environment applications.

Availability

CD74HC258M is available at Aetrix Electronics and suitable for industrial PLCs, automated test equipment, legacy microcontroller interfaces, and redundant control logic requiring stable component supply across long production lifecycles.

Supply support for CD74HC258M 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 industrial, automotive, and communications markets.

The CD74HC258M belongs to TI's legacy HC logic family, engineered for robust, low-power, wide-supply digital signal routing in mission-critical and extended-temperature applications.

FAQ

What is the maximum operating frequency supported by the CD74HC258M?

The CD74HC258M does not specify a maximum clock frequency, but its 19 ns typical propagation delay at VCC = 4.5 V supports reliable operation in data routing paths up to approximately 25 MHz. System-level timing must account for setup/hold times relative to the select (S) and output-enable (OE) signals. The CD74HC258M is not intended for use as a synchronous clocked mux - it is purely combinational logic.

Does the CD74HC258M support 3.3 V operation?

Yes, the CD74HC258M fully supports 3.3 V operation within its specified 2V–6V supply range. At VCC = 3.3 V, it maintains TTL-compatible input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V), 4 mA output drive, and guaranteed propagation delay under 25 ns. This makes the CD74HC258M suitable for mixed-voltage systems interfacing with both 3.3 V and 5 V logic domains.

Is the CD74HC258M pin-compatible with the SN74HC157N?

Yes, the CD74HC258M is pin-compatible with the SN74HC157N: both use the same 16-pin PDIP package and identical pin assignments for inputs, outputs, select (S), output-enable (OE), VCC, and GND. However, the CD74HC258M is characterized for −55°C to +125°C, while the SN74HC157N is limited to −40°C to +85°C - a critical distinction for thermal design validation.

What is the purpose of the common select line (S) in the CD74HC258M?

The common select line (S) in the CD74HC258M simultaneously controls all four internal 2:1 multiplexers. When S = LOW, each channel routes its A-input (1A–4A) to the corresponding output (1Y–4Y); when S = HIGH, it routes the B-inputs (1B–4B). This synchronized selection simplifies control logic and ensures atomic signal path switching across all channels in the CD74HC258M.

Can the CD74HC258M be used in place of a bus transceiver?

The CD74HC258M is not a bidirectional bus transceiver, but its 3-state outputs allow controlled unidirectional bus sharing when paired with external direction logic. Unlike true transceivers (e.g., SN74LVC245), the CD74HC258M lacks built-in direction control and cannot drive bidirectional data flow. It serves best as a multiplexer or gated signal selector - not as a replacement for dedicated bus transceivers in the CD74HC258M application context.