Texas Instruments SN74HC258DR

Overview

SN74HC258DR 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 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) input. It serves as a bus interface device in digital logic systems requiring signal routing from dual sources per channel.

For engineers reviewing the SN74HC258DR datasheet, SN74HC258DR pinout, SN74HC258DR application, or SN74HC258DR equivalent, key selection criteria include its inverted output logic, 3-state bus isolation, SOIC-16 package compatibility, and performance under 2–6 V operation with defined timing margins at 50 pF load.

Technical Context

The SN74HC258DR implements four independent 2:1 multiplexers sharing common address (A/B) and active-low enable (G) inputs. Each channel selects between two complementary data inputs (A or B) and drives an inverted output (Y), with all outputs entering high-impedance state when G is high.

Its CMOS HC-family architecture ensures low static current (≤80 µA ICC), rail-to-rail output swing, and compatibility with LSTTL loads. Timing behavior is characterized by propagation delay (tpd), enable/disable times (ten/tdis), and transition time (tt), all specified across VCC = 2 V, 4.5 V, and 6 V with CL = 50 pF and CL = 150 pF.

Key Specifications

Pinout & Package

SN74HC258DR is housed in a 16-pin SOIC (D) package measuring 9.90 mm × 3.90 mm with standard 1.27 mm pitch. Pin numbering follows JEDEC MS-012, with Pin 1 located at the top-left corner marked by a beveled edge or dot.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC257DR and 74LVC257PW, SN74HC258DR uniquely delivers inverted outputs across the full 2–6 V range in SOIC-16, making it optimal for bus arbitration and active-low enable architectures where polarity alignment simplifies system-level logic.

Availability

SN74HC258DR is available at Aetrix Electronics and suitable for industrial control systems, test instrumentation, and embedded microcontroller peripheral expansion requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for SN74HC258DR 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 for industrial, automotive, and personal electronics markets.

SN74HC258DR 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 tolerance are critical.

FAQ

What is the function of the G pin on the SN74HC258DR?

The G pin on the SN74HC258DR is the active-low output enable input. When G is logic high, all four Y outputs enter a high-impedance (Hi-Z) state, effectively disconnecting them from the bus. When G is logic low, the multiplexer operates normally, routing either A or B inputs to each Y output with inversion. This enables clean bus sharing across multiple devices without contention.

Does SN74HC258DR support 3.3 V operation?

Yes, SN74HC258DR fully supports 3.3 V operation within its specified 2 V to 6 V supply range. At VCC = 3.3 V, it maintains guaranteed logic thresholds, 3-state behavior, and timing performance - though propagation delay increases slightly versus 4.5 V operation. The device is commonly deployed in mixed-voltage systems interfacing 3.3 V MCUs with 5 V peripherals.

How does SN74HC258DR differ from SN74HC257DR?

SN74HC258DR and SN74HC257DR share identical pinout, package, supply range, and timing specifications, but differ in output polarity: SN74HC258DR delivers inverted outputs (Y = NOT(selected input)), while SN74HC257DR provides non-inverted outputs (Y = selected input). This makes SN74HC258DR ideal for active-low bus enable schemes or direct interface with inverters or NAND-based logic.

Can SN74HC258DR drive LSTTL loads directly?

Yes, SN74HC258DR can directly drive up to 15 LSTTL loads per output. Its ±6 mA output drive capability at VCC = 5 V meets the LSTTL input current requirements (IIL ≤ 0.4 mA, IIH ≤ 20 µA), eliminating the need for buffer stages in most legacy TTL interfacing scenarios while maintaining valid logic levels and timing margins.

What is the recommended bypass capacitor for SN74HC258DR?

Texas Instruments recommends a 0.1 µF ceramic capacitor placed as close as possible to the VCC pin (Pin 15) and GND (Pin 8) of SN74HC258DR. This minimizes high-frequency supply noise induced by switching transients. For enhanced noise suppression, a parallel 1 µF tantalum or ceramic capacitor may be added, but the 0.1 µF unit is mandatory for stable operation per the datasheet guidelines.