Texas Instruments SN74HCS151QDRQ1

Overview

SN74HCS151QDRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified 8-to-1 CMOS multiplexer with Schmitt-trigger inputs, operating from 2V to 6V supply, delivering ±7.8mA output drive at 6V and featuring typical ICC of 100nA for low-power data routing in engine control units and body electronics.

For engineers reviewing the SN74HCS151QDRQ1 datasheet, SN74HCS151QDRQ1 pinout, SN74HCS151QDRQ1 application, or SN74HCS151QDRQ1 equivalent, key selection criteria include its hysteresis-enabled noise immunity (ΔVT = 0.67–1.29V), dual complementary outputs (Y/W), strobe-controlled enable logic, and support for slow input transitions in harsh automotive environments.

Technical Context

The SN74HCS151QDRQ1 implements asynchronous 8:1 data selection using three binary address inputs (A, B, C) to route one of eight data sources to the non-inverting Y output while simultaneously providing the inverted W output. Its strobe (G) input forces Y = LOW and W = HIGH when high, overriding all address and data inputs.

All inputs integrate Schmitt-trigger architecture with defined VT+ (1.13–3.49V) and VT− (0.65–2.45V) thresholds across 2V–6V supply, yielding hysteresis ΔVT of 0.29–1.29V for robust noise rejection and tolerance to slow-rising/falling signals-critical for sensor interface and switch debouncing in automotive systems.

Key Specifications

Pinout & Package

SN74HCS151QDRQ1 is supplied in a 16-pin SOIC (D) package measuring 9.90mm × 3.90mm with standard gull-wing leads. The package supports automated optical inspection (AOI) via wettable flanks and includes thermal pad grounding option for enhanced thermal performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-to-1 multiplexer applications.

Compared with SN74LV151A-Q1 and MC74HC151A-D, SN74HCS151QDRQ1 uniquely combines automotive qualification, Schmitt-trigger noise immunity, and nanoampere quiescent current-making it the only choice for safety-critical, low-power, and electrically noisy vehicle subsystems.

Availability

SN74HCS151QDRQ1 is available at Aetrix Electronics and suitable for engine control units, body control modules, ADAS camera synchronization, and infotainment display backlight control requiring stable component supply across automotive production lifecycles.

Supply support for SN74HCS151QDRQ1 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 company specializing in analog and embedded processing technologies, with leadership in automotive IC design, functional safety, and high-reliability manufacturing.

The SN74HCS151QDRQ1 belongs to TI's HCS logic family, engineered specifically for automotive signal routing applications demanding AEC-Q100 compliance, ultra-low power, and robust noise immunity in harsh electrical environments.

FAQ

What is the maximum operating temperature for SN74HCS151QDRQ1?

The SN74HCS151QDRQ1 is rated for ambient temperatures from –40°C to +125°C per AEC-Q100 Grade 1 qualification. This specification is validated across the full supply voltage range (2V–6V) and applies to continuous operation in automotive under-hood and cabin environments where thermal cycling and long-term reliability are critical.

Does SN74HCS151QDRQ1 require external pull-up or pull-down resistors on unused inputs?

Yes - unused address (A/B/C) or data (D0–D7) inputs on SN74HCS151QDRQ1 must be terminated to either VCC or GND to prevent floating states that cause undefined output behavior and increased dynamic current. TI recommends 10kΩ resistors for default HIGH or LOW biasing, consistent with Schmitt-trigger input leakage limits (±100nA max).

Can SN74HCS151QDRQ1 drive a 50pF capacitive load while meeting all timing specifications?

Yes - SN74HCS151QDRQ1 switching characteristics (tpd ≤17ns, tt ≤8ns) are guaranteed with CL = 50pF, as specified in Section 5.6 of the datasheet. Exceeding this load increases propagation delay and transition time; TI advises limiting total trace + input capacitance to ≤50pF for full spec compliance in timing-critical automotive functions.

What is the purpose of the strobe (G) input on SN74HCS151QDRQ1?

The strobe (G) input on SN74HCS151QDRQ1 is an active-low enable control: when G = LOW, the multiplexer operates normally, routing the selected Dn input to Y/W based on A:B:C; when G = HIGH, Y is forced LOW and W is forced HIGH regardless of address or data states - enabling global output disable for bus isolation or power sequencing.

Is SN74HCS151QDRQ1 compatible with 3.3V logic systems?

Yes - SN74HCS151QDRQ1 operates across 2V–6V, making it fully compatible with 3.3V logic systems. At VCC = 3.3V, it delivers VOH ≥3.2V (IOH = –20µA) and VOL ≤0.1V (IOL = 20µA), ensuring robust noise margins with standard 3.3V CMOS interfaces while maintaining Schmitt-trigger hysteresis (ΔVT ≈0.52–1.03V).