Texas Instruments SN74AHC157DR

Overview

SN74AHC157DR from Texas Instruments is a quadruple 2-line to 1-line data selector/multiplexer in SOIC-16 package, operating from 2 V to 5.5 V supply, with 4.1 ns typical propagation delay at 5 V, ±8 mA output drive, and true (non-inverted) data routing. It serves as a digital signal routing switch in microcontroller peripheral expansion, bus arbitration, and logic-level data path selection.

For engineers reviewing the SN74AHC157DR datasheet, SN74AHC157DR pinout, SN74AHC157DR application, or SN74AHC157DR equivalent, key selection criteria include its active-low strobe control (G), A/B address select input, quad-channel independent data switching capability, and compatibility with mixed-voltage 3.3 V/5 V systems.

Technical Context

The SN74AHC157DR implements four independent 2:1 multiplexers sharing a common active-low strobe (G) and a single address select (A/B) input. When G is high, all Y outputs are forced low regardless of A/B or data inputs; when G is low, each Yn selects either An or Bn based on A/B state.

Its CMOS AHC logic family ensures rail-to-rail output swing, low static current (4 µA typical ICC), and robust ESD protection (±2000 V HBM). The device supports both 3.3 V and 5 V operation without level-shifting, with propagation delays scaling predictably across VCC (e.g., 4.1 ns @ 5 V, 6.2 ns @ 3.3 V).

Key Specifications

Pinout & Package

SN74AHC157DR is housed in a 16-pin SOIC (D) package measuring 9.90 mm × 6.00 mm (body: 9.90 mm × 3.90 mm), RoHS-compliant with NiPdAu lead finish and MSL Level-1 rating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LV157A and 74HC157, the SN74AHC157DR delivers superior speed at low voltage, lower quiescent power than HC, and broader supply flexibility-making it optimal for new 3.3 V/5 V mixed-signal designs requiring deterministic timing.

Availability

SN74AHC157DR is available at Aetrix Electronics and suitable for industrial automation, embedded test equipment, and legacy interface bridging requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for SN74AHC157DR 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 decades of expertise in high-reliability logic families.

The SN74AHC157DR belongs to TI's advanced high-speed CMOS (AHC) logic portfolio, designed for low-power, high-speed digital signal routing in industrial, communications, and computing applications.

FAQ

What is the maximum recommended operating temperature for SN74AHC157DR?

The SN74AHC157DR is rated for operation from –40 °C to +125 °C ambient temperature. Its thermal resistance (RθJA) is 93.8 °C/W in the SOIC-16 package, so sustained operation near the upper limit requires adequate PCB copper area and airflow to maintain junction temperature within safe limits. Derating curves in the datasheet confirm full functionality across this range.

Can SN74AHC157DR operate reliably at 2.0 V supply voltage?

Yes, SN74AHC157DR is fully specified down to 2.0 V VCC, with guaranteed parameters including VIH/VIL thresholds, propagation delay (≤11.5 ns max at 2 V), and output drive. At 2 V, it delivers 0.05 µA IOH/IOL and maintains rail-to-rail swing-making it suitable for battery-powered or low-voltage portable systems.

Does SN74AHC157DR support hot insertion or live swapping?

No, SN74AHC157DR does not feature hot-swap or Ioff protection. Its inputs and outputs are not designed to tolerate back-driving while unpowered. Applying voltage to any pin before VCC is stable may cause latch-up or damage. Always power VCC before applying input signals.

How does the strobe (G) input affect output behavior in SN74AHC157DR?

When G is high, all four Y outputs (1Y–4Y) are forced low regardless of A/B state or data inputs-this is a hard-wired disable function. When G is low, the device performs normal 2:1 multiplexing: A/B selects whether An or Bn appears at Yn. This enables synchronized channel blanking in time-division systems.

Is SN74AHC157DR pin-compatible with older 74LS157 or 74HC157 devices?

SN74AHC157DR shares identical pinout and function table with 74HC157 and 74LS157 in the SOIC-16 package, but differs electrically: AHC offers higher speed, lower power, and wider VCC range. While mechanical fit is identical, verify timing margins and drive strength compatibility in LS/HC legacy designs before substitution.