Texas Instruments SN74HCS153QPWRQ1

Overview

SN74HCS153QPWRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive dual 4-to-1 CMOS multiplexer with Schmitt-trigger inputs, operating from 2 V to 6 V supply, delivering ±7.8-mA output drive at 6 V, and featuring typical ICC of 100 nA for ultra-low-power data routing in engine control units and ADAS sensor interfaces.

For engineers reviewing the SN74HCS153QPWRQ1 datasheet, SN74HCS153QPWRQ1 pinout, SN74HCS153QPWRQ1 application, or SN74HCS153QPWRQ1 equivalent, key selection criteria include automotive temperature range (–40°C to +125°C), Schmitt-trigger noise immunity, dual independent strobe control (1G/2G), and wettable-flank WQFN-16 package compatibility with AOI inspection.

Technical Context

The SN74HCS153QPWRQ1 implements two independent 4:1 multiplexers sharing common address inputs (A, B) but each with dedicated active-low strobe inputs (1G, 2G) that force respective outputs (1Y, 2Y) low regardless of select state. Its asynchronous operation enables real-time signal routing without clock dependency.

Schmitt-trigger inputs provide hysteresis (ΔVT = 0.6 V min at 6 V), enabling robust operation with slow-rising signals and noise rejection up to ±0.3 V peak-to-peak. Balanced CMOS push-pull outputs support bidirectional drive capability with matched sourcing/sinking performance across the full 2–6 V supply range.

Key Specifications

Pinout & Package

SN74HCS153QPWRQ1 is packaged in a 16-pin wettable-flank WQFN (WBQB) measuring 3.60 mm × 2.60 mm, optimized for automated optical inspection (AOI) via side-fillet solder joint visibility. Thermal pad is optional and may be connected to GND or left floating.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual 4-to-1 multiplexer applications.

Compared with SN74LV4052AQPWRQ1, SN74HCS153QPWRQ1 provides superior noise immunity for digital control signals; compared with SN74HCS253QPWRQ1, it offers manufacturability advantages via wettable-flank WQFN and identical pinout across Q1-grade variants.

Availability

SN74HCS153QPWRQ1 is available at Aetrix Electronics and suitable for automotive engine control, ADAS sensor fusion, and body electronics requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for SN74HCS153QPWRQ1 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 and embedded processing technologies, with over 90 years of innovation in automotive, industrial, and consumer electronics.

The SN74HCS153QPWRQ1 belongs to TI's HCS logic family designed specifically for automotive-grade signal routing-emphasizing low power, noise resilience, and AEC-Q100 compliance for safety-critical subsystems.

FAQ

What is the maximum operating frequency of the SN74HCS153QPWRQ1?

The SN74HCS153QPWRQ1 supports a maximum switching frequency of 36 MHz at 6 V supply voltage, as specified in the switching characteristics table. This value decreases to 31 MHz at 4.5 V and 5 MHz at 2 V. The actual achievable frequency depends on load capacitance (CL ≤ 50 pF recommended) and signal edge rates; propagation delay remains below 14 ns across the full operating range, making SN74HCS153QPWRQ1 suitable for high-speed digital selection in automotive timing-critical applications.

Does the SN74HCS153QPWRQ1 require external pull-up or pull-down resistors on unused inputs?

No, external resistors are not required on unused inputs of the SN74HCS153QPWRQ1 because its Schmitt-trigger inputs tolerate undefined states without excessive current draw. However, TI recommends tying unused inputs to VCC or GND to prevent floating nodes that could cause erratic behavior in noisy automotive environments. The SN74HCS153QPWRQ1 exhibits only ±100 nA leakage current, so direct connection poses no risk of overloading driving sources, and this practice ensures deterministic logic states during EMI events.

Can the SN74HCS153QPWRQ1 drive LED indicators directly?

Yes, the SN74HCS153QPWRQ1 can drive standard indicator LEDs directly when operated at 5 V or 6 V supply, as its ±7.8-mA output drive capability exceeds typical LED forward currents (2–20 mA). For a red LED with 1.8 V VF, a 390 Ω series resistor limits current to ~8 mA at 5 V - well within SN74HCS153QPWRQ1's rated sink/source capacity. Always verify VOL ≤ 0.33 V and VOH ≥ 4.3 V under load per the electrical characteristics table to ensure compatible logic levels with downstream circuitry.

What is the purpose of the thermal pad on the SN74HCS153QPWRQ1 WQFN package?

The thermal pad on the SN74HCS153QPWRQ1 WBQB package serves as a secondary heat dissipation path and improves mechanical stability during reflow. TI specifies it may be connected to GND or left floating - no electrical connection is mandatory. When tied to GND, it enhances thermal resistance (RθJB = 66.4°C/W) and provides additional grounding for noise suppression. Leaving it unconnected does not impair functionality but forfeits thermal and EMI benefits; the pad must never be connected to VCC or signal nets to avoid short circuits or latch-up risks in the SN74HCS153QPWRQ1.

How does the Schmitt-trigger input architecture improve noise immunity in the SN74HCS153QPWRQ1?

The Schmitt-trigger inputs in the SN74HCS153QPWRQ1 provide hysteresis (ΔVT = 0.6 V minimum at 6 V), meaning the threshold for detecting a rising edge (VT+ = 4.2 V) differs from that for a falling edge (VT− = 3.6 V). This 0.6 V window prevents multiple toggles caused by noise spikes smaller than the hysteresis band. As a result, SN74HCS153QPWRQ1 reliably interprets slow-rising signals from mechanical switches or noisy harnesses without external filtering - a critical advantage in automotive applications where EMI from ignition systems or motors would otherwise corrupt digital selections.