Texas Instruments SN74HC258D

Overview

SN74HC258D 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 voltage. It features 12 ns typical propagation delay at 4.5 V, ±6 mA output drive capability, and high-impedance enable control via active-low strobe (G). It serves in bus interface applications where signal routing from dual sources to shared data lines is required under logic-level control.

For engineers reviewing the SN74HC258D datasheet, SN74HC258D pinout, SN74HC258D application, or SN74HC258D equivalent, this page delivers verified electrical specs, SOIC-16 package details, functional mode truth table alignment, real-world use cases in digital bus arbitration and signal routing, and two validated alternative parts with documented differences.

Technical Context

The SN74HC258D implements four independent 2:1 multiplexers sharing common address select (A/B) and active-low output-enable (G) inputs. Each channel selects between two complementary input pairs (A_n/B_n) and drives an inverted output (Y_n) that enters high-impedance when G is high. Its CMOS architecture ensures low static current (≤80 µA ICC) and rail-to-rail output swing.

Logic operation follows a strict function table: when G = L, Y_n = NOT(A_n if A/B = L, else B_n); when G = H, all Y_n = Z. This enables synchronized bus isolation and source selection without contention, critical for time-multiplexed data paths in microcontroller peripherals and FPGA I/O expansion.

Key Specifications

Pinout & Package

SN74HC258D is housed in a 16-pin SOIC (Small Outline Integrated Circuit) package with nominal body dimensions of 9.90 mm × 3.90 mm and standard 1.27 mm lead pitch. The package is RoHS-compliant, moisture sensitivity level 1, and rated for operation from –40 °C to +85 °C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC257D, SN74HC258D provides inverted outputs enabling direct connection to active-low enable inputs; compared with 74LVC258PW, it offers broader voltage flexibility (2–6 V) and SOIC packaging but trades off speed and 3.3 V optimization.

Availability

SN74HC258D is available at Aetrix Electronics and suitable for industrial control panels, legacy system upgrades, and microcontroller peripheral interfaces requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for SN74HC258D 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, embedded processing, and connectivity solutions for industrial, automotive, and consumer applications.

The SN74HC258D belongs to TI's 74HC logic family, designed for robust, low-power digital signal routing in mixed-voltage systems where reliability, wide supply tolerance, and predictable timing are critical.

FAQ

What is the logic polarity of SN74HC258D outputs?

The SN74HC258D provides inverted outputs: when G = L and A/B = L, Y_n = NOT(A_n); when G = L and A/B = H, Y_n = NOT(B_n). This is explicitly defined in the function table of the SN74HC258D datasheet and distinguishes it from the non-inverting SN74HC257D. All four Y outputs follow this inversion behavior identically.

Can SN74HC258D operate reliably at 2.5 V supply?

Yes, SN74HC258D is fully specified from 2 V to 6 V, including at 2.5 V. At VCC = 2.5 V, the device maintains valid VIH/VIL thresholds (VIH ≥ 1.7 V, VIL ≤ 0.8 V), 150 ns max propagation delay, and ±4 mA output drive - meeting requirements for low-voltage mixed-signal systems such as battery-powered sensors interfaced to 2.5 V MCUs.

Is SN74HC258D pin-compatible with SN74HC257D?

Yes, SN74HC258D and SN74HC257D share identical SOIC-16 pinouts, supply ranges, timing specs, and DC characteristics - differing only in output polarity. This allows direct PCB replacement when logic inversion is acceptable or compensated elsewhere in the design, with no layout changes required.

What is the maximum capacitive load SN74HC258D can drive while maintaining 12 ns tpd?

The 12 ns typical propagation delay for SN74HC258D is specified at CL = 50 pF. Driving heavier loads increases tpd nonlinearly: at CL = 150 pF, tpd rises to 32 ns (max) at VCC = 6 V. For designs requiring ≤12 ns timing, total load (including trace capacitance and input capacitance of driven devices) must stay at or below 50 pF.

Does SN74HC258D require external pull-up resistors on its control inputs?

No - SN74HC258D has CMOS inputs with ≤1 µA leakage, so external pull-ups are not required for stability. However, TI recommends tying G to VCC via a pull-up resistor during power-up/power-down to guarantee high-impedance outputs before control logic initializes; a 10 kΩ resistor is typical and sufficient.