Texas Instruments SN74AHC158DBR

Overview

SN74AHC158DBR 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 outputs, and 16-pin SSOP (DB) package. It routes one of two 4-bit input sources to four outputs based on select control (A/B), with propagation delays as low as 4.1 ns at 5 V and ±8 mA output drive capability.

For engineers reviewing the SN74AHC158DBR datasheet, SN74AHC158DBR pinout, SN74AHC158DBR application, or SN74AHC158DBR equivalent, key selection considerations include its 2–5.5 V supply range, guaranteed 16 ns max propagation delay at 3.3 V/50 pF, latch-up immunity >250 mA per JESD 17, and ESD protection exceeding 2000-V HBM - critical for industrial logic interfacing and signal routing in noise-prone environments.

Technical Context

The SN74AHC158DBR 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 high regardless of inputs; when G is low, each Yn selects between An and Bn based on A/B state, delivering inverted output logic.

Its CMOS AHC-family architecture ensures TTL-compatible input thresholds, rail-to-rail output swing, and low static current (ICC ≤ 40 µA at 5.5 V). The device supports mixed-voltage system interfacing across 2 V–5.5 V domains and meets JESD 22 ESD standards (2000-V HBM, 200-V MM, 1000-V CDM).

Key Specifications

Pinout & Package

SN74AHC158DBR uses a 16-pin SSOP (Shrink Small Outline Package) with 0.65 mm pitch, 7.4 mm × 5.3 mm body size, and 2.0 mm max height. Pin 1 is located in Quadrant Q1 per tape-and-reel orientation standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LV158APWR and 74AHC157PW, the SN74AHC158DBR uniquely delivers inverted outputs with best-in-class 4.1 ns min propagation delay at 5 V and superior 2000-V HBM ESD rating - making it optimal for industrial signal routing where noise immunity and timing predictability are prioritized over minimal supply voltage.

Availability

SN74AHC158DBR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, test equipment signal switching, and medical diagnostic data routing requiring stable component supply and long-term production continuity.

Supply support for SN74AHC158DBR 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 over 50 years of innovation in high-reliability logic families.

The SN74AHC158DBR belongs to TI's advanced high-speed CMOS (AHC) logic product line, designed specifically for low-power, high-noise-immunity digital signal routing in industrial automation, automotive electronics, and portable instrumentation.

FAQ

What is the maximum operating temperature range for the SN74AHC158DBR?

The SN74AHC158DBR is rated for operation from –40°C to +85°C ambient temperature, as confirmed in TI's official ordering information and recommended operating conditions table. This range aligns with commercial and extended industrial applications, and thermal derating is not required up to 85°C under specified load and airflow conditions. The SSOP (DB) package has a θJA of 82°C/W, supporting reliable thermal performance in enclosed enclosures with moderate airflow.

Does the SN74AHC158DBR support 3.3 V logic levels without level shifters?

Yes, the SN74AHC158DBR fully supports 3.3 V operation: its VIH is 2.1 V and VIL is 0.9 V at VCC = 3.3 V, providing 1.2 V high-state and 2.4 V low-state noise margins. Input thresholds are internally scaled to VCC, and outputs swing rail-to-rail - enabling direct interface with 3.3 V microcontrollers, FPGAs, and other AHC/LV/AHCT logic without external translation.

How does the strobe (G) pin function on the SN74AHC158DBR?

The strobe (G) pin on the SN74AHC158DBR is an active-low enable: when G = high, all four Y outputs are forced high regardless of A/B or data inputs; when G = low, normal 2:1 multiplexing resumes. This allows synchronous blanking of outputs during bus arbitration or state transitions - a feature absent in non-strobed equivalents like the 74AHC157, making SN74AHC158DBR preferable for time-critical signal gating.

Is the SN74AHC158DBR pin-compatible with other 16-pin multiplexers like the 74AHC157?

No, the SN74AHC158DBR is not pin-compatible with the 74AHC157: although both are 16-pin SSOP devices with identical power and ground pin locations (pins 7, 12, 16), their signal pin assignments differ - notably, SN74AHC158DBR places A/B on pin 9 and G on pin 8, whereas 74AHC157 uses pin 1 for 1A and pin 15 for 1B. Board redesign is required for substitution.

What packaging and reel specifications apply to the SN74AHC158DBR?

The SN74AHC158DBR ships in SSOP-16 (DB) package with 2000 units per large tape-and-reel (reel diameter 330 mm, width 16.4 mm, quadrant Q1). It carries RoHS-compliant NiPdAu lead finish, MSL Level-1 (unlimited floor life at <30°C/60% RH), and is marked "HA158" on top. Tape dimensions follow JEDEC MO-150, with cavity pitch P1 = 12.0 mm and pocket width B0 = 6.6 mm.