Texas Instruments SN74AHC158DR

Overview

SN74AHC158DR from Texas Instruments is a quadruple 2-line to 1-line data selector/multiplexer IC operating from 2 V to 5.5 V, featuring inverted outputs, a common strobe (G) input, and 16-pin SOIC packaging. It routes one of two 4-bit input sources to four outputs based on the A/B select line, with propagation delays as low as 4.1 ns at 5 V and ±8 mA output drive capability.

For engineers reviewing the SN74AHC158DR datasheet, SN74AHC158DR pinout, SN74AHC158DR application, or SN74AHC158DR equivalent, this device supports logic-level signal routing in digital control systems, address/data bus selection, and test instrumentation where low-power, high-speed CMOS multiplexing with enable-controlled output disable is required.

Technical Context

The SN74AHC158DR 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 inputs; when G is low, each Yn selects between An and Bn per the A/B state, delivering inverted output logic.

It uses advanced high-speed CMOS (AHC) technology with TTL-compatible input thresholds, rail-to-rail output swing, and ESD protection exceeding 2000-V HBM. Its switching behavior is characterized across 2–5.5 V VCC, with propagation delay tightly specified for both 15 pF and 50 pF loads at 3.3 V and 5 V supply conditions.

Key Specifications

Pinout & Package

SN74AHC158DR is housed in a 16-pin SOIC (D) package measuring 9.9 mm × 3.91 mm × 1.75 mm (max height), RoHS-compliant, with NIPDAU lead finish and moisture sensitivity level (MSL) 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 SN74AHC158DR, SN74LV158APWR trades speed and 2-V operation for lower voltage flexibility, while 74AHC157D,118 provides identical timing and drive but requires redesign of downstream logic to accommodate non-inverted outputs.

Availability

SN74AHC158DR is available at Aetrix Electronics and suitable for industrial automation, automotive diagnostics, and test equipment requiring stable component supply, long-term manufacturability, and RoHS-compliant SOIC packaging.

Supply support for SN74AHC158DR 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 experience in high-reliability logic families.

The SN74AHC158DR belongs to the AHC logic series designed for high-speed, low-power, TTL-compatible digital signal routing in industrial, automotive, and communications infrastructure applications.

FAQ

What is the maximum operating temperature for SN74AHC158DR?

The SN74AHC158DR is rated for operation from –40°C to +85°C ambient temperature. This industrial-grade temperature range ensures reliable performance in factory-floor controllers, automotive under-hood modules, and outdoor test equipment without derating. The SOIC package's θJA of 73°C/W supports thermal management in standard PCB layouts with moderate copper pour.

Does SN74AHC158DR support 3.3-V-only operation without level shifting?

Yes, SN74AHC158DR operates fully within specification at 3.3 V VCC, with VIH = 2.1 V and VIL = 0.9 V - compatible with standard 3.3-V CMOS logic levels. Its 2–5.5 V supply range eliminates need for external level shifters when interfacing with 3.3-V microcontrollers, FPGAs, or sensors, provided all inputs remain within 0–VCC.

How does the strobe (G) input affect output behavior in SN74AHC158DR?

When G is high, all four Y outputs are forced high regardless of A/B or data inputs - effectively disabling data routing and isolating downstream circuits. When G is low, the A/B select line determines whether A-inputs or B-inputs pass through to the outputs, with inversion applied. This enables synchronous bus gating and power-aware signal path control.

Can SN74AHC158DR drive a 50-pF load at 50 MHz without signal degradation?

At 5 V VCC and 50 pF load, SN74AHC158DR exhibits tPLH/tPHL ≤ 9.5 ns, supporting clean edges up to ~100 MHz fundamental frequency. However, sustained 50 MHz switching into 50 pF requires careful PCB layout (short traces, ground plane, local decoupling) due to cumulative capacitive loading and edge-rate limitations (∆t/∆v = 20 ns/V at 5 V).

Is SN74AHC158DR pin-compatible with older 74LS158 or 74HC158 devices?

No - SN74AHC158DR shares the same 16-pin SOIC footprint and pinout as SN74HC158 and SN74LS158, but its electrical characteristics differ significantly: AHC offers higher speed, lower power, and wider VCC range than LS or HC. Direct replacement is possible only if timing, drive strength, and voltage compatibility are verified for the target application.