Texas Instruments SN74AHC158NSRE4

Overview

SN74AHC158NSRE4 from Texas Instruments is a quadruple 2-line to 1-line data selector/multiplexer IC operating from 2 V to 5.5 V, featuring a common strobe (G) input, inverted output logic, and 16-pin SOP (NS) package. It routes one of two 4-bit data sources to four outputs based on select input A/B, with propagation delays as low as 4.1 ns at 5 V and ±8 mA output drive capability. It is used in digital logic routing, address/data bus selection, and signal path arbitration in industrial control and embedded systems.

For engineers reviewing the SN74AHC158NSRE4 datasheet, SN74AHC158NSRE4 pinout, SN74AHC158NSRE4 application, or SN74AHC158NSRE4 equivalent, key selection considerations include its 2–5.5 V supply range, inverted output behavior, strobe-controlled 4-channel multiplexing, guaranteed latch-up immunity (>250 mA), and ESD robustness per JESD22 (2000-V HBM).

Technical Context

The SN74AHC158NSRE4 implements four independent 2:1 multiplexers sharing a single active-low strobe (G) and a common select input (A/B). When G is high, all Y outputs are forced high regardless of A/B or data inputs; when G is low, each Yn selects between An and Bn based on A/B state and inverts the selected input. Its CMOS AHC logic family ensures rail-to-rail swing, low static current, and compatibility with TTL and CMOS interfaces across the full 2–5.5 V range.

It operates within –40°C to +85°C ambient temperature, supports 15 pF and 50 pF load capacitances, and delivers specified tPLH/tPHL down to 4.1 ns (VCC = 5 V, CL = 15 pF). Input thresholds scale with VCC (VIH = 0.7×VCC min, VIL = 0.3×VCC max), and unused inputs must be tied to VCC or GND to prevent floating-node instability.

Key Specifications

Pinout & Package

SOP (NS) package: 16-pin small-outline plastic package, 5.3 mm × 10.2 mm body, 1.75 mm height, 0.65 mm lead pitch, gull-wing leads, RoHS-compliant NiPdAu finish, MSL Level-1 (260 °C peak reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LV158APWR and 74HC158D,653, the SN74AHC158NSRE4 delivers superior speed (4.1 ns), stronger drive (±8 mA), and certified industrial ESD/latch-up performance - making it optimal for real-time control and mixed-voltage industrial interfaces where timing predictability and reliability are critical.

Availability

SN74AHC158NSRE4 is available at Aetrix Electronics and suitable for industrial automation, test equipment, and embedded computing applications requiring stable component supply, long-term manufacturability, and RoHS-compliant sourcing.

Supply support for SN74AHC158NSRE4 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 specializing in analog, embedded processing, and logic ICs, with decades of leadership in industrial-grade logic families and broad distribution infrastructure.

The SN74AHC158NSRE4 belongs to TI's Advanced High-Speed CMOS (AHC) logic portfolio, designed specifically for high-speed, low-noise, mixed-voltage digital systems in industrial, automotive, and communications infrastructure.

FAQ

What is the maximum clock frequency supported by SN74AHC158NSRE4?

The SN74AHC158NSRE4 does not operate on a clock; it is a combinational logic device. Its maximum usable data rate depends on propagation delay and load. With 4.1 ns typical tPLH/tPHL at 5 V and 15 pF, it supports clean signal routing up to ~100 MHz toggle frequency in well-designed PCB layouts with controlled impedance and proper termination.

Does SN74AHC158NSRE4 require external pull-up or pull-down resistors on its inputs?

No - SN74AHC158NSRE4 inputs are CMOS and do not require external biasing. However, TI explicitly requires all unused inputs (A/B, G, A1–A4, B1–B4) to be tied to VCC or GND to prevent floating nodes that could cause excessive ICC or erratic output behavior. Leaving inputs unconnected violates recommended operating conditions.

Is SN74AHC158NSRE4 pin-compatible with SN74HC158N?

Yes - SN74AHC158NSRE4 (SOP-16 NS package) shares identical pinout, terminal functions, and footprint with SN74HC158N (PDIP-16 N package) and other variants like SN74AHC158DR (SOIC-16 D package). The logic function, pin numbering, and I/O assignment are fully consistent across the SN74AHC158 family, enabling drop-in replacement where package fit allows.

What is the meaning of "inverted output" in SN74AHC158NSRE4 functionality?

SN74AHC158NSRE4 outputs are inverted: when A/B = low and G = low, Y = NOT(A); when A/B = high and G = low, Y = NOT(B). This means the device passes the logical complement of the selected input. For non-inverted routing, an external inverter or logic inversion in firmware is required - the IC itself does not provide true non-inverting 2:1 multiplexing.

Can SN74AHC158NSRE4 operate reliably at 2.0 V supply voltage?

Yes - SN74AHC158NSRE4 is fully specified down to 2.0 V VCC. At 2 V, it guarantees VOH ≥ 1.9 V, VOL ≤ 0.1 V, and tPLH/tPHL ≤ 11.5 ns (CL = 15 pF), meeting standard AHC logic thresholds. It maintains full functionality and timing compliance across the entire 2–5.5 V range without derating or configuration changes.