Texas Instruments SN74F157ANG4

Overview

SN74F157ANG4 from Texas Instruments is a quadruple 2-input data selector/multiplexer with common strobe (G) control, operating at 4.5–5.5 V supply, delivering true logic outputs, 6.5 ns max tPHL on A/B-to-Y paths, and rated for 0°C to 70°C industrial temperature range. It routes one of two 4-bit input words to four outputs based on the A/B select line, used in address/data bus switching and digital logic control systems.

For engineers reviewing the SN74F157ANG4 datasheet, SN74F157ANG4 pinout, SN74F157ANG4 application, or SN74F157ANG4 equivalent, this page delivers verified functional behavior, validated DIP-16 package mapping, timing-critical propagation delays, absolute maximum ratings, and real-world multiplexer use cases without generic assumptions.

Technical Context

The SN74F157ANG4 implements four independent 2:1 multiplexers sharing a single active-low strobe (G) and a common select line (A/B). When G is high, all Y outputs are forced low regardless of A/B or input states; when G is low, each Yn follows the selected input (An or Bn) as determined by A/B. This enables synchronous 4-bit word selection with guaranteed glitch-free output enable/disable control.

It uses bipolar TTL F-series logic with buffered inputs and outputs, supporting 20 mA sink current per output and compatible with standard 5-V TTL logic families. Its electrical characteristics are specified over 0°C to 70°C, with VIH = 2 V min, VIL = 0.8 V max, VOL = 0.5 V max at 20 mA, and VOH = 2.5 V min at –1 mA - ensuring robust noise margin and interfacial reliability in mixed-logic systems.

Key Specifications

Pinout & Package

SN74F157ANG4 is supplied in a 16-pin plastic dual in-line package (PDIP-N), with 0.3-inch body width, through-hole mounting, and industry-standard pin spacing (0.1 inch). The package includes internal no-connect (NC) pins at positions 3 and 12, and features VCC (pin 16) and GND (pin 8) on opposite corners for decoupling stability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LS157N and SN74HC157N, the SN74F157ANG4 delivers the fastest propagation (6.5 ns), highest drive strength (20 mA), and strictest TTL compatibility - making it optimal for legacy 5-V systems where speed and interface fidelity are prioritized over static power.

Availability

SN74F157ANG4 is available at Aetrix Electronics and suitable for microprocessor bus switching, test equipment signal routing, digital prototyping, legacy controller upgrades, and industrial logic consolidation requiring stable component supply and long-term obsolescence management.

Supply support for SN74F157ANG4 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 U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and logic solutions with broad industrial, automotive, and communications reach.

The SN74F series was designed for high-speed TTL-compatible logic applications in computing, instrumentation, and control systems - emphasizing speed, noise immunity, and drop-in replaceability across generations of 5-V digital hardware.

FAQ

Is SN74F157ANG4 pin-compatible with SN74LS157N?

Yes, SN74F157ANG4 is pin-compatible with SN74LS157N: both use PDIP-16 packaging with identical pin assignments for all inputs (1A–4A, 1B–4B, A/B, G), outputs (1Y–4Y), VCC, and GND. No PCB changes are required for substitution, though timing and drive strength differ.

What is the maximum clock frequency supported by SN74F157ANG4?

SN74F157ANG4 does not operate on a clock; it is combinatorial logic. Its usable data rate depends on propagation delay: with 6.5 ns max tPHL and setup/hold margins, reliable operation supports data switching up to ~80 MHz in ideal conditions, assuming clean edges and matched trace lengths.

Can SN74F157ANG4 drive LEDs directly?

Yes, SN74F157ANG4 can drive LEDs directly in active-low configuration: connect LED anode to VCC and cathode to any Y output. With 20 mA sink capability and 0.5 V max VOL, it supports standard 2–20 mA indicator LEDs without external transistors or current-limiting resistors beyond the series resistor.

Does SN74F157ANG4 require pull-up or pull-down resistors on unused inputs?

Yes - unused inputs (e.g., A/B or G) must be terminated to valid logic levels. Floating TTL inputs bias unpredictably and increase power consumption. Tie A/B to GND or VCC, and G to GND for enabled operation or VCC for disabled (all-Y-low) state using 1–10 kΩ resistors.

What is the meaning of "NG4" in SN74F157ANG4?

The "NG4" suffix in SN74F157ANG4 indicates a specific TI packaging and marking variant: N = PDIP package, G4 = fourth revision of the tube packaging standard per TI's internal ordering nomenclature, including RoHS-compliant lead finish and updated traceability marking - fully compatible with base SN74F157AN functionality and pinout.