Texas Instruments SN74HC258PWT

Overview

SN74HC258PWT from Texas Instruments is a quadruple 2-line to 1-line inverting data selector/multiplexer with 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 high-impedance enable control (G) for bus interface applications in digital logic systems.

For engineers reviewing the SN74HC258PWT datasheet, SN74HC258PWT pinout, SN74HC258PWT application, or SN74HC258PWT equivalent, this page delivers verified electrical specs, functional mode behavior, package-specific pin mapping, real-world use cases, and validated alternative parts for bus arbitration and signal routing designs.

Technical Context

The SN74HC258PWT implements four independent 2:1 multiplexers sharing common address (A/B) and active-low strobe (G) inputs. Each channel selects between two input signals (A or B) and passes the inverted version to its Y output. A high G forces all Y outputs into high-impedance state, enabling shared-bus operation without contention.

Its CMOS HC-family architecture ensures low static current (≤80 µA), rail-to-rail output swing, and compatibility with TTL loads. Input thresholds scale with VCC, supporting mixed-voltage system interfacing while maintaining noise margins per JEDEC standards.

Key Specifications

Pinout & Package

TSSOP-16 (PW) package: 5.00 mm × 4.40 mm body, 0.65 mm lead pitch, 1.2 mm max height, RoHS-compliant NiPdAu lead finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC257PWR and 74LVC257APW, SN74HC258PWT uniquely delivers inverted outputs within the robust 2–6 V HC family, making it optimal for applications needing polarity inversion plus wide-voltage interoperability and proven industrial reliability.

Availability

SN74HC258PWR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, digital test equipment signal routing, and embedded microcontroller peripheral sharing requiring stable component supply and long-term manufacturability.

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 specializing in analog, embedded processing, and logic solutions with over 50 years of industrial-grade product development.

The SN74HC258PWR belongs to TI's 74HC logic family, designed for robust, low-power digital signal routing in industrial automation, test instrumentation, and legacy-system upgrades where wide supply range and bus-interface capability are essential.

FAQ

What is the function of the G (strobe) pin on the SN74HC258PWR?

The G pin on the SN74HC258PWR is an active-low enable input that controls all four 3-state outputs simultaneously. When G is HIGH, all Y outputs enter high-impedance state, isolating them from the bus. When G is LOW, outputs become active and reflect the inverted selection of A or B inputs based on the A/B address line. This behavior is critical for bus arbitration and preventing signal contention in multi-source systems using SN74HC258PWR.

How does the SN74HC258PWR differ from the SN74HC257PWR?

The SN74HC258PWR provides inverted outputs (Y = NOT(selected input)), whereas the SN74HC257PWR provides non-inverted outputs (Y = selected input). Both share identical pinout, supply range (2–6 V), propagation delay (12 ns vs. 9 ns), and 3-state enable architecture. The choice depends strictly on whether system-level logic requires signal inversion - SN74HC258PWR is selected when downstream gates expect complemented data, avoiding extra inverters in the signal path.

Can the SN74HC258PWR operate reliably at 3.3 V?

Yes, the SN74HC258PWR operates reliably across 2 V to 6 V, including standard 3.3 V supply rails. At 3.3 V, its typical propagation delay is 15 ns (CL = 50 pF), output drive is ±4.2 mA, and input thresholds meet VIH ≥ 2.0 V and VIL ≤ 0.99 V - fully compatible with 3.3 V LVTTL and mixed-signal interfaces. No level-shifting circuitry is needed when interfacing with 3.3 V microcontrollers or FPGAs using SN74HC258PWR.

What is the recommended bypass capacitor for the SN74HC258PWR?

Texas Instruments recommends a 0.1 µF ceramic capacitor placed as close as possible to the VCC (pin 16) and GND (pin 8) pins of the SN74HC258PWR. This capacitor suppresses high-frequency supply noise generated during output switching transitions. For enhanced noise immunity in noisy environments, a parallel 1 µF capacitor may be added - but the 0.1 µF unit remains mandatory and must have low ESL/ESR characteristics to maintain stability in all operating conditions of SN74HC258PWR.

Is the SN74HC258PWR pin-compatible with through-hole versions like SN74HC258N?

Yes, the SN74HC258PWR (TSSOP-16) shares identical pin numbering and signal assignment with SN74HC258N (PDIP-16), SN74HC258DR (SOIC-16), and SN74HC258NSR (SOP-16). All variants implement the same logic function, electrical specifications, and pinout per TI's SCLS224C datasheet. However, due to differing package dimensions and soldering requirements, PCB layout must be adapted - SN74HC258PWR cannot be substituted without board revision, though schematic connectivity remains unchanged.