Texas Instruments SN74HC258PWR

Overview

SN74HC258PWR from Texas Instruments is a quadruple 2-line to 1-line inverting data selector/multiplexer with 3-state outputs, operating from 2 V to 6 V supply. It features 12 ns typical propagation delay at 4.5 V, ±6-mA output drive, 80-µA max ICC, and high-impedance outputs controlled by active-low strobe (G). It enables bus interface selection in digital logic systems such as industrial control I/O expansion.

For engineers reviewing the SN74HC258PWR datasheet, SN74HC258PWR pinout, SN74HC258PWR application, or SN74HC258PWR equivalent, key selection criteria include its inverted output logic, TSSOP-16 package footprint, 3-state enable timing (15 ns enable time at 4.5 V), and compatibility with HC-family voltage thresholds across 2–6 V operation.

Technical Context

The SN74HC258PWR implements four independent 2:1 multiplexers sharing common address (A/B) and active-low strobe (G) inputs. Each channel selects between two input sources (A or B) and delivers an inverted output (Y), with all outputs entering high-impedance state when G is high.

Its 3-state outputs support bidirectional bus interfacing without external pull-ups; propagation delay varies with supply voltage (12 ns typ. at 4.5 V, 17 ns max at 6 V) and load capacitance (CL = 50 pF), while input leakage remains ≤1 µA across temperature.

Key Specifications

Pinout & Package

TSSOP-16 package (5.00 mm × 4.40 mm body, 1.2 mm max height), lead finish NIPDAU/SN, moisture sensitivity level 1, RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC257PWR and 74LVC258PW, SN74HC258PWR provides guaranteed inverted output behavior across 2–6 V operation, making it optimal for bus arbitration and legacy-compatible signal conditioning where polarity inversion is functionally required.

Availability

SN74HC258PWR is available at Aetrix Electronics and suitable for industrial control I/O expansion, embedded system address decoding, digital test equipment signal routing, and legacy interface level translation requiring stable component supply and long-term production continuity.

Supply support for SN74HC258PWR 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 delivering analog and embedded processing solutions, with over 90 years of innovation in logic, power management, and signal chain technologies.

The SN74HC258PWR belongs to TI's 74HC logic family, designed for robust, low-power, wide-supply-voltage digital interfacing in industrial, automotive, and communications equipment where reliability and compatibility with legacy HC standards are critical.

FAQ

What is the logic function of SN74HC258PWR?

The SN74HC258PWR is a quadruple 2-line to 1-line inverting data selector/multiplexer. For each of its four channels, it selects either input A or B based on the A/B address pin and delivers the inverted value at output Y. When the active-low strobe (G) is HIGH, all outputs enter high-impedance state. This function is confirmed in the device functional table and block diagram of the official TI datasheet SCLS224C.

Does SN74HC258PWR support 3.3-V operation?

Yes, SN74HC258PWR operates across 2 V to 6 V, including standard 3.3-V supply rails. At VCC = 3.3 V, it meets all recommended operating conditions: VIH ≥ 2.31 V, VIL ≤ 0.99 V, and maintains 3-state functionality and specified propagation delay. Electrical characteristics tables in the TI datasheet confirm performance across this full range.

What is the pinout compatibility between SN74HC258PWR and SN74HC257PWR?

SN74HC258PWR and SN74HC257PWR share identical TSSOP-16 pinouts and package dimensions. The only functional difference is output polarity: SN74HC258PWR outputs are inverted, while SN74HC257PWR outputs are non-inverted. All control, data, power, and ground pins map 1:1, enabling drop-in replacement where logic inversion is acceptable or compensated in firmware.

What is the maximum capacitive load SN74HC258PWR can drive reliably?

SN74HC258PWR is characterized for CL = 50 pF and CL = 150 pF in its switching characteristics tables. At CL = 150 pF and VCC = 4.5 V, typical propagation delay is 30 ns and transition time is 42 ns. Driving loads beyond 150 pF may increase delay and degrade edge integrity; for heavier loads, consider buffering or reducing trace capacitance per TI layout guidelines.

How does the SN74HC258PWR handle unused inputs?

All unused inputs of SN74HC258PWR must be tied to VCC or GND to prevent floating states that cause excessive ICC, noise susceptibility, or undefined outputs. The TI datasheet explicitly states this in Section 5.2 and Section 9.1. Leaving inputs unconnected violates recommended operating conditions and risks erratic behavior - no internal pull-ups or pull-downs are provided on address or data pins.