Texas Instruments SN74AHC158PW

Overview

SN74AHC158PW from Texas Instruments is a quadruple 2-line to 1-line data selector/multiplexer in TSSOP-16 package, operating from 2 V to 5.5 V, featuring inverted outputs, common strobe (G) control, and ±8 mA output drive at 5 V. It routes one of two 4-bit input sources to four outputs based on select line state, used in digital logic routing, address/data path selection, and bus multiplexing in embedded controllers.

For engineers reviewing the SN74AHC158PW datasheet, SN74AHC158PW pinout, SN74AHC158PW application, or SN74AHC158PW equivalent, key selection criteria include its 2–5.5 V supply range, 11.5 ns max propagation delay (VCC = 3.3 V, CL = 15 pF), latch-up immunity (>250 mA), ESD robustness (2000-V HBM), and TSSOP-16 thermal resistance (108°C/W).

Technical Context

The SN74AHC158PW implements four independent 2:1 multiplexers sharing a single active-low strobe (G) input 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 per the A/B state. All outputs are inverted - a logical '0' on selected input yields '1' at output.

It uses advanced high-speed CMOS (AHC) process technology, delivering rail-to-rail output swing, low static current (max 40 µA at 5.5 V), and noise immunity with dynamic VIH(D) = 3.5 V and VIL(D) = 1.5 V at VCC = 5 V. Input transition rate limits (20 ns/V at 5 V) ensure reliable timing under fast edge conditions.

Key Specifications

Pinout & Package

TSSOP-16 package (PW), 4.4 mm × 5.0 mm body, 1.2 mm max height, 0.65 mm lead pitch, exposed pad not present, RoHS-compliant NiPdAu finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC158PW and 74AHC157PW, the SN74AHC158PW uniquely combines 5 V-tolerant inputs, inverted outputs, and 2–5.5 V operation - making it the only option for mixed-voltage, polarity-critical routing where external inversion adds cost or timing skew.

Availability

SN74AHC158PW is available at Aetrix Electronics and suitable for industrial control panels, test instrumentation, and legacy system upgrades requiring stable component supply, long-lifecycle support, and guaranteed traceability.

Supply support for SN74AHC158PW 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 SN74AHC158PW belongs to the AHC advanced high-speed CMOS logic family, designed for low-power, high-noise-immunity digital routing in industrial, automotive, and communications equipment where supply flexibility and robustness are essential.

FAQ

What is the maximum clock frequency supported by SN74AHC158PW in a data-select application?

The SN74AHC158PW does not operate on a clock; it is asynchronous. Its usable data rate is governed by propagation delay (7.5 ns max at 5 V) and input transition rate (20 ns/V). For reliable operation with clean edges, the effective maximum toggle rate is ~50 MHz in worst-case routing - verified by tPLH/tPHL measurements under CL = 15 pF load. The SN74AHC158PW must be used with proper setup/hold timing relative to control signals (A/B, G), not a system clock.

Does SN74AHC158PW support 5 V logic inputs when powered from 3.3 V?

No. The SN74AHC158PW has 5 V-tolerant inputs only when VCC = 5 V. At VCC = 3.3 V, the absolute maximum input voltage is 7 V, but DC input thresholds scale with VCC (VIH = 2.1 V, VIL = 0.9 V at 3.3 V), and exceeding VCC + 0.5 V on any input risks damage. For 5 V input interfacing at 3.3 V supply, external level translation is required. The SN74AHC158PW specification explicitly ties 5 V tolerance to VCC ≥ 4.5 V operation.

Can SN74AHC158PW outputs drive LEDs directly?

Yes, with current-limiting resistors. Each SN74AHC158PW output can sink or source up to 8 mA at VCC = 5 V. To drive a typical 2 V, 10 mA LED, use a 390 Ω resistor from VCC to LED anode and connect cathode to SN74AHC158PW output - the device will sink 7.7 mA (within spec) when output is low. Do not exceed 8 mA per output or 50 mA total across VCC/GND pins. The SN74AHC158PW's inverted output means LED turns ON when output is low.

Is there a pin-compatible non-inverting alternative to SN74AHC158PW?

Yes - the 74AHC157PW is functionally identical except for output polarity: it provides true (non-inverted) outputs. Pinout is identical (TSSOP-16), including shared A/B select (pin 1), G strobe (pin 10), and I/O positions. However, the SN74AHC158PW and 74AHC157PW differ in truth table behavior: SN74AHC158PW outputs ¬A or ¬B; 74AHC157PW outputs A or B. No PCB change is needed, but firmware or upstream logic must compensate for polarity reversal.

What is the thermal resistance (θJA) of SN74AHC158PW and how does it affect power dissipation?

The SN74AHC158PW has θJA = 108°C/W (JEDEC JESD 51-7, 2-layer board). At max ICC = 40 µA and 8 mA output load (worst-case dynamic), power dissipation remains below 50 mW - resulting in <5.4°C junction rise above ambient. This confirms suitability for sealed enclosures or high-temperature industrial environments without heatsinking. The SN74AHC158PW's low Cpd (11 pF) and CMOS topology inherently minimize self-heating even at 10 MHz toggle rates.