Texas Instruments SN74HC258PW

Overview

SN74HC258PW from Texas Instruments is a quadruple 2-line to 1-line data selector/multiplexer with inverted 3-state outputs, operating across 2 V to 6 V supply. It features 12 ns typical propagation delay at 4.5 V, ±6 mA output drive, and low 80 µA max ICC. Used in bus interface applications where signal routing from dual sources to shared data lines requires active-low enable control and output inversion.

For engineers reviewing the SN74HC258PW datasheet, SN74HC258PW pinout, SN74HC258PW application, or SN74HC258PW equivalent, this page delivers verified functional mode behavior, TSSOP-16 package dimensions, CL = 50 pF switching characteristics, thermal resistance (RθJA = 108 °C/W), and precise logic-level compatibility per TI SCLS224C Rev C.

Technical Context

The SN74HC258PW implements four independent 2:1 multiplexers sharing common address (A/B) and active-low strobe (G) inputs. Each channel selects between two inputs (A or B) and drives an inverted output (Y), entering high-impedance state when G is high. Its HC logic family ensures CMOS-level input thresholds and TTL-compatible output drive.

Functionally distinct from the non-inverting SN74HC257PW, the SN74HC258PW's inverted outputs enable direct integration into systems requiring polarity inversion during data selection-e.g., complementing bus drivers or enabling negative-logic control paths without external inverters.

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 2:1 multiplexer applications.

Compared with SN74HC257PW and 74LVC257APW, the SN74HC258PW uniquely provides inverted outputs across the full 2–6 V range, making it irreplaceable in designs requiring polarity inversion without added gate count or voltage translation.

Availability

SN74HC258PW is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, medical diagnostic equipment, and test & measurement instrumentation requiring stable component supply and long-term lifecycle support.

Supply support for SN74HC258PW 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 ICs, with over 90 years of innovation in industrial, automotive, and communications markets.

The SN74HC258PW belongs to TI's 74HC logic family, designed for high-noise-immunity, low-power digital signal routing in bus-oriented systems where 3-state control and wide supply flexibility are essential.

FAQ

What is the function of the G pin on the SN74HC258PW?

The G pin on the SN74HC258PW is the active-low output enable terminal. When G is high, all four Y outputs enter high-impedance (Hi-Z) state regardless of A/B or data inputs. When G is low, outputs reflect the inverted, selected input (A or B). This enables bus sharing and prevents contention in multi-driver systems.

Does the SN74HC258PW support 3.3 V operation?

Yes, the SN74HC258PW fully supports 3.3 V operation within its 2 V to 6 V supply range. At VCC = 3.3 V, VIH is 2.31 V min and VIL is 1.09 V max per TI SCLS224C, ensuring compatibility with standard 3.3 V logic families without level shifters.

How does the SN74HC258PW differ from the SN74HC257PW?

The SN74HC258PW provides inverted outputs (Y = NOT(A·NOT(B)+B·A)), whereas the SN74HC257PW provides true outputs (Y = A·NOT(B)+B·A). All other specifications-including pinout, timing, supply range, and 3-state behavior-are identical. The inversion is intrinsic to the SN74HC258PW silicon design.

What is the maximum capacitive load the SN74HC258PW can drive reliably?

The SN74HC258PW switching characteristics (tpd, tt, ten, tdis) are specified for CL = 50 pF and CL = 150 pF loads. Driving >150 pF may increase propagation delay and transition time beyond datasheet limits; for loads exceeding 150 pF, buffer amplification or layout optimization is recommended to maintain timing integrity.

Is the SN74HC258PW pin-compatible with other TSSOP-16 logic devices?

The SN74HC258PW uses standard TSSOP-16 mechanical dimensions (5.00 mm × 4.40 mm) and JEDEC MO-153-compliant pinout. However, pin compatibility with other logic functions (e.g., SN74HC00, SN74HC138) is not guaranteed-only identical part numbers or explicitly documented drop-in replacements ensure functional and electrical equivalence.