Texas Instruments SN74F258DRE4

Overview

SN74F258DRE4 from Texas Instruments is a quadruple 2-line-to-1-line data selector/multiplexer with 3-state outputs, designed for bus-organized systems requiring signal routing from four 2-bit sources to four independent outputs. It operates at 4.5–5.5 V, supports 0°C to 70°C ambient, and delivers tPLH/tPHL propagation delays as low as 1 ns (typical) with 24 mA sink capability per output.

For engineers reviewing the SN74F258DRE4 datasheet, SN74F258DRE4 pinout, SN74F258DRE4 application, or SN74F258DRE4 equivalent, key selection criteria include its 3-state bus interface capability, A/B select logic control, OE-enabled output disable, and SOIC-16 package compatibility with legacy TTL system designs.

Technical Context

The SN74F258DRE4 implements four independent 2:1 multiplexers sharing a common A/B select line and global output-enable (OE) input. Each channel routes either the A or B input to its Y output based on the logic level of A/B, while OE controls high-impedance state across all four outputs simultaneously.

It uses standard F-series TTL circuitry with guaranteed operation under 5 V ±10%, supports 50 pF capacitive loads, and exhibits defined switching behavior across temperature extremes (0°C to 70°C), making it suitable for deterministic timing in backplane and motherboard data path applications.

Key Specifications

Pinout & Package

SN74F258DRE4 is packaged in a 16-pin SOIC (D package), 7.5 mm wide, with standard 1.27 mm pitch. Pin numbering follows JEDEC MS-012, top-view orientation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar data selector/multiplexer applications.

Compared with SN74LS258N and SN74HC257DR, the SN74F258DRE4 uniquely balances 24 mA drive, sub-10 ns propagation, and strict TTL voltage compatibility-making it irreplaceable in high-fanout, timing-critical 5 V bus architectures where both speed and robustness are required.

Availability

SN74F258DRE4 is available at Aetrix Electronics and suitable for computer backplane bus switching, industrial PLC I/O multiplexing, and legacy test equipment signal routing requiring stable component supply and long-term obsolescence management.

Supply support for SN74F258DRE4 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 founded in 1930, specializing in analog, embedded processing, and logic solutions with broad industrial and automotive reach.

The SN74F258DRE4 belongs to TI's 74F TTL logic family, engineered for high-speed, low-noise digital signal routing in mission-critical commercial systems where reliability and timing predictability are non-negotiable.

FAQ

What is the function of the A/B pin on the SN74F258DRE4?

The A/B pin on the SN74F258DRE4 is a common select input that determines which of the two data inputs (A or B) is routed to each of the four Y outputs. When A/B = LOW, all 1Y–4Y outputs reflect their respective 1A–4A inputs; when A/B = HIGH, they reflect 1B–4B. This single-line control simplifies synchronization across all four channels in bus-switching applications.

Does the SN74F258DRE4 support hot insertion into a live bus?

The SN74F258DRE4 is not rated for hot insertion. Its absolute maximum ratings specify that output voltages must remain within −0.5 V to 5.5 V when disabled, and no current-limiting or ESD-hardened architecture is documented. For live-bus applications, external protection circuitry or a purpose-built hot-swap controller is required alongside the SN74F258DRE4.

Can the SN74F258DRE4 be used with 3.3 V logic systems?

No-the SN74F258DRE4 requires a minimum VCC of 4.5 V and is specified only for 4.5–5.5 V operation. Its input thresholds (VIH = 2.0 V, VIL = 0.8 V) and output VOH/VOL levels are optimized for 5 V TTL signaling. Direct connection to 3.3 V logic risks undervoltage lockout, incorrect switching, or excessive input current; level translation is mandatory if interfacing with 3.3 V systems.

What is the maximum capacitive load the SN74F258DRE4 can drive reliably?

The SN74F258DRE4 is characterized for reliable operation with a 50 pF capacitive load, as confirmed in its switching characteristics table (CL = 50 pF). Driving >50 pF may increase propagation delay beyond specification limits and degrade edge rate; for heavier loads, buffer stages or reduced trace length are recommended to maintain timing integrity in the SN74F258DRE4 signal path.

Is the SN74F258DRE4 pin-compatible with the SN74F157?

No-the SN74F258DRE4 and SN74F157 are not pin-compatible. While both are quadruple 2:1 multiplexers, the SN74F157 uses dual independent select lines (S0/S1) and has different pin assignments (e.g., S0 on pin 1, S1 on pin 15), whereas the SN74F258DRE4 uses a single A/B select (pin 9) and shares OE on pin 7. PCB layout cannot be reused between them without redesign.