Texas Instruments SN74HCS237QDRQ1

Overview

SN74HCS237QDRQ1 from Texas Instruments is an automotive-qualified 3-to-8 decoder/demultiplexer with latched address inputs, Schmitt-trigger inputs, and dual strobe control (G0 active-high, G1 active-low). It operates from 2 V to 6 V, delivers ±7.8-mA output drive at 6 V, and features typical ICC of 100 nA - enabling low-power memory selection and data routing in harsh-temperature environments (–40°C to +125°C).

For engineers reviewing the SN74HCS237QDRQ1 datasheet, SN74HCS237QDRQ1 pinout, SN74HCS237QDRQ1 application, or SN74HCS237QDRQ1 equivalent, key selection criteria include latch-enable polarity (active-low LE), Schmitt-trigger hysteresis (ΔVT = 0.6 V min at 6 V), output enable logic interaction, and AEC-Q100 Grade 1 qualification for automotive infotainment and body control modules.

Technical Context

The SN74HCS237QDRQ1 implements a CMOS-based 3-bit latched decoder with independent strobe gating: G0 (active-high) and G1 (active-low) both force all outputs low when asserted. Its latch enable (LE) is active-low - when LE = L, the device functions as a standard 3:8 decoder; when LE = H, the internal address latches retain prior state regardless of A2–A0 transitions.

Schmitt-trigger inputs provide noise immunity (ΔVT ≥ 0.6 V at 6 V) and support slow input edges, while balanced push-pull outputs deliver symmetrical sourcing/sinking capability (±7.8 mA at 6 V) without requiring external pull-ups. The device uses silicon-gate CMOS technology and exhibits typical input leakage of ±100 nA at 6 V.

Key Specifications

Pinout & Package

SN74HCS237QDRQ1 is packaged in a 16-pin SOIC (D package) with nominal body size 9.90 mm × 3.90 mm, optimized for automated optical inspection and thermal reliability in reflow-soldered automotive PCBs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 3-to-8 decoder applications.

Compared with SN74HCS138QDRQ1, SN74HCS237QDRQ1 adds latching and Schmitt inputs at the cost of active-high outputs; versus MC74HC237ADTR2G, it provides guaranteed automotive qualification, wider temperature margin, and lower leakage - essential for production Tier-1 deployments.

Availability

SN74HCS237QDRQ1 is available at Aetrix Electronics and suitable for automotive infotainment systems, body control modules, and ADAS domain controllers requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for SN74HCS237QDRQ1 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 automotive ICs, with decades of experience delivering high-reliability components for transportation systems.

The SN74HCS237QDRQ1 belongs to TI's automotive-qualified HCS logic family, designed specifically for noise-immune, low-power signal routing and memory selection in electrically harsh vehicle environments.

FAQ

What is the latch enable (LE) polarity for SN74HCS237QDRQ1?

The latch enable (LE) input of the SN74HCS237QDRQ1 is active-low. When LE is low, the device operates as a standard 3-to-8 decoder responding immediately to changes on A2–A0. When LE is high, the internal address latches retain their previous state, holding the selected output regardless of subsequent address changes. This behavior is confirmed in the device functional modes table and timing diagrams of the official datasheet.

Does SN74HCS237QDRQ1 support 3.3-V operation?

Yes, SN74HCS237QDRQ1 fully supports 3.3-V operation within its recommended supply range of 2 V to 6 V. At 3.3 V, it delivers typical output drive of ±6 mA, maintains Schmitt-trigger hysteresis of ≥0.4 V, and exhibits ICC < 200 nA - making it compatible with modern low-voltage automotive microcontrollers and FPGA I/O banks without level shifting.

How do the G0 and G1 strobe inputs interact in SN74HCS237QDRQ1?

In SN74HCS237QDRQ1, G0 (active-high) and G1 (active-low) operate as independent enable controls: asserting either G0 = H or G1 = L forces all eight outputs (Y0–Y7) into the low state. Both must be deasserted (G0 = L and G1 = H) for normal decoded output behavior. This OR-style disable logic enables flexible hierarchical control - for example, G0 for functional enable and G1 for safety-critical shutdown.

Is SN74HCS237QDRQ1 pin-compatible with SN74HC237?

No, SN74HCS237QDRQ1 is not pin-compatible with the non-automotive SN74HC237. While both share identical pin numbering and basic 3:8 decoder functionality, SN74HCS237QDRQ1 incorporates Schmitt-trigger inputs and revised latch enable behavior (active-low LE vs. active-high in older HC variants), and its qualification documentation explicitly defines distinct electrical and timing parameters validated for automotive use.

What is the maximum capacitive load SN74HCS237QDRQ1 can drive while meeting datasheet timing specs?

SN74HCS237QDRQ1 is characterized for CL = 50 pF in its switching and timing specifications. Driving loads exceeding 50 pF will increase propagation delay and transition time beyond datasheet limits - for example, tpd increases from 17 ns (max at 6 V, CL = 50 pF) to >30 ns at 100 pF. TI recommends limiting total output capacitance to ≤50 pF via short PCB traces and minimal fanout to ensure timing compliance in automotive applications.