Texas Instruments SN74HC253QDRG4Q1

Overview

SN74HC253QDRG4Q1 from Texas Instruments is an automotive-qualified dual 4-line to 1-line data selector/multiplexer with 3-state outputs, implementing full binary decoding for channel selection and independent output-enable control per section. It operates from 2V to 6V, delivers ±6mA drive at 5V, exhibits typical propagation delay of 9ns (CL = 50pF, VCC = 4.5V), and supports bus-oriented systems via high-impedance outputs - used in vehicle body control modules for signal routing between sensor banks and microcontroller inputs.

For engineers reviewing the SN74HC253QDRG4Q1 datasheet, SN74HC253QDRG4Q1 pinout, SN74HC253QDRG4Q1 application, or SN74HC253QDRG4Q1 equivalent, key selection criteria include its AEC-Q100 qualification, dual independent 4:1 multiplexing capability, 3-state output timing (ten/tdis), supply voltage flexibility (2–6V), and SOIC-16 package compatibility with automotive PCB layout constraints.

Technical Context

This device integrates two independent 4-input multiplexers sharing common select lines (A/B) but featuring separate 3-state output enables (1OE/2OE), enabling selective bus arbitration without contention. Each section decodes A/B inputs to route one of four data inputs (C0–C3) to its respective output (1Y/2Y) while supporting parallel-to-serial conversion through controlled channel enable sequencing.

Its HC logic family ensures CMOS-level power efficiency (ICC ≤ 160µA) and TTL-compatible drive strength (15 LSTTL loads), with input thresholds scaled to VCC (VIH = 3.15V min at 4.5V). The 3-state outputs support bidirectional bus interfacing, where only one output is enabled at a time to avoid bus conflicts in distributed automotive subsystems.

Key Specifications

Pinout & Package

SN74HC253QDRG4Q1 is housed in a 16-pin SOIC (D) package measuring 9.9mm × 6mm (including pins), with body dimensions of 9.9mm × 3.9mm. The package is RoHS-compliant, NIPDAU lead-finished, and rated MSL Level-1 (260°C reflow unlimited).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC253QDRG4Q1, SN74HC153QDRG4Q1 lacks 3-state capability - limiting bus integration - while MC74HC253ADTR2G offers identical functionality but with higher junction-to-ambient thermal resistance, requiring tighter airflow or lower ambient limits in sealed enclosures.

Availability

SN74HC253QDRG4Q1 is available at Aetrix Electronics and suitable for automotive body control modules, instrument clusters, and diagnostic interface designs requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.

Supply support for SN74HC253QDRG4Q1 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-grade logic, power management, and interface solutions.

The SN74HC253QDRG4Q1 belongs to TI's automotive-qualified HC logic family, designed specifically for signal routing and data consolidation in harsh-environment electronic control units where reliability, wide voltage operation, and precise timing are critical.

FAQ

What is the maximum operating frequency supported by SN74HC253QDRG4Q1?

The SN74HC253QDRG4Q1 does not specify a maximum clock frequency in its datasheet because it is a combinational logic device without an internal clock. Its usable data rate depends on propagation delay (tpd ≤ 38ns at VCC = 6V, CL = 50pF) and system timing margins. For reliable operation with 50pF load, SN74HC253QDRG4Q1 supports data switching up to approximately 10MHz in typical bus applications, assuming setup/hold times are met by the driving controller.

Does SN74HC253QDRG4Q1 support 3.3V-only operation?

Yes, SN74HC253QDRG4Q1 fully supports 3.3V operation: VIH is guaranteed ≥ 2.0V at VCC = 3.3V (per recommended operating conditions), and VOH/VOL meet 3.3V logic thresholds with adequate noise margin. It drives 3.3V LVTTL loads and interfaces seamlessly with 3.3V microcontrollers - confirmed by electrical characteristics tables showing performance at VCC = 4.5V (representative of 3.3V–5V range) and functional operation down to 2V.

How does the 3-state output control work on SN74HC253QDRG4Q1?

SN74HC253QDRG4Q1 implements independent active-low 3-state control via pins 1OE and 15 (2OE): when either OE is high, its corresponding output (1Y or 2Y) enters high-impedance state regardless of select or data inputs. This allows one channel to drive the bus while the other is electrically disconnected - essential for avoiding contention in shared-data-path architectures like automotive LIN or proprietary sensor buses.

Is SN74HC253QDRG4Q1 pin-compatible with the commercial-grade SN74HC253?

Yes, SN74HC253QDRG4Q1 is pin-compatible with the catalog SN74HC253 in the same SOIC-16 (D) package, sharing identical pin configuration, function mapping, and DC/AC electrical behavior. The Q1 suffix denotes AEC-Q100 qualification and extended temperature range (−40°C to +125°C), but no pinout or logic changes are introduced - enabling drop-in replacement in automotive designs requiring enhanced reliability validation.

What bypass capacitor value is recommended for SN74HC253QDRG4Q1?

Texas Instruments recommends a 0.1µF ceramic bypass capacitor placed as close as possible to the VCC pin (pin 16) with a low-inductance ground return path. For improved noise suppression across wider frequency bands, pairing this with a 1µF capacitor in parallel is acceptable. Layout guidelines emphasize minimizing trace length and using wide copper pours to reduce impedance - critical for maintaining signal integrity in automotive EMI-prone environments where SN74HC253QDRG4Q1 is deployed.