Toshiba Semiconductor and Storage 74HC237D

Overview

74HC237D from Toshiba is a high-speed CMOS 3-to-8 decoder with address latch functionality, implementing binary-to-octal decoding and data latching via a gated latch (GL) input. It features dual enable inputs (G1, G2) for cascadeable memory address decoding, operates from 2.0 V to 6.0 V, and delivers 12 ns typical propagation delay at 5 V. It is used in microprocessor-based memory subsystems for chip select generation.

For engineers reviewing the 74HC237D datasheet, 74HC237D pinout, 74HC237D application, or 74HC237D equivalent, key selection criteria include latch-enabled address decoding timing, SOIC16 package compatibility, wide VCC range support, and cascading capability via G1/G2 enables - critical for legacy and industrial control bus architectures.

Technical Context

The 74HC237D integrates a 3-bit transparent latch controlled by GL and a 3-to-8 active-low decoder with independent G1 (active-low) and G2 (active-high) enables. Latched input data determines which of eight outputs (Y0–Y7) goes low; all outputs remain high when decoding is inhibited (G1 = low or G2 = high).

Its C2MOS silicon gate process enables LSTTL-compatible speed with CMOS power efficiency: tPLH/tPHL are balanced (~12 ns typ. at 5 V), and ICC remains ≤4.0 µA max at 25 °C. Input protection circuits guard against ESD and transient overvoltage.

Key Specifications

Pinout & Package

74HC237D is housed in a 16-pin Small Outline Integrated Circuit (SOIC16) package, 7.5 mm wide, with standard 1.27 mm pitch and gull-wing leads. The package is RoHS-compliant and rated for surface-mount reflow assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC237N and 74HCT237D, the 74HC237D offers optimal surface-mount manufacturability and CMOS input compatibility across 2.0–6.0 V, making it preferred for modern industrial PCBs where density and mixed-voltage interoperability are critical.

Availability

74HC237D is available at Aetrix Electronics and suitable for memory address decoding, industrial PLC I/O expansion, legacy bus interface logic, and embedded system boot configuration requiring stable component supply across extended temperature ranges.

Supply support for 74HC237D 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

Toshiba Electronic Devices & Storage Corporation designs and manufactures high-reliability semiconductor components for industrial, automotive, and consumer applications, with emphasis on logic, power, and analog ICs.

The 74HC237D belongs to Toshiba's HC-series high-speed CMOS logic family, engineered specifically for robust address decoding and latching in resource-constrained embedded systems operating across wide voltage and temperature ranges.

FAQ

What is the primary function of the 74HC237D?

The 74HC237D is a 3-to-8 line decoder with integrated address latch functionality. It accepts three binary address inputs (A, B, C), stores them when the GL (gate latch) input is high, and drives exactly one of eight active-low outputs (Y0–Y7) based on the latched value. Dual enable inputs (G1, G2) allow cascading for larger decode structures. This makes the 74HC237D ideal for memory-mapped peripheral selection and hierarchical address decoding in microcontroller systems.

Does the 74HC237D support operation at 3.3 V?

Yes, the 74HC237D fully supports 3.3 V operation. Its specified supply voltage range is 2.0 V to 6.0 V, and all DC and AC parameters-including VIH/VIL thresholds, propagation delay (12 ns typ. at 5 V, scalable), and output drive-are guaranteed across this range. At 3.3 V, it maintains CMOS-compatible input levels and delivers sufficient fan-out for interfacing with 3.3 V microcontrollers and peripherals without level translation.

How does the GL input differ from the G1 and G2 enable inputs on the 74HC237D?

The GL (Gate Latch) input controls data capture: when high, it transparently latches the A/B/C address inputs; when low, the latch holds its previous state. In contrast, G1 (active-low) and G2 (active-high) are decode enables: decoding is active only when G1 = high AND G2 = low. All outputs go high if either enable condition fails-making G1/G2 ideal for hierarchical chip selection, while GL provides timing-controlled address sampling.

What package type is used for the 74HC237D?

The 74HC237D is supplied in a 16-pin Small Outline Integrated Circuit (SOIC16) package, 7.5 mm wide, with 1.27 mm lead pitch and gull-wing terminations. This surface-mount package is RoHS-compliant, optimized for reflow soldering, and widely supported in automated PCB assembly. Pinout matches industry-standard 74HC237 logic devices, ensuring drop-in compatibility in existing SOIC16 footprints.

Is the 74HC237D suitable for automotive applications?

The 74HC237D is not AEC-Q100 qualified and is not recommended for automotive safety-critical systems. While it operates from -40 °C to +125 °C - a range overlapping some automotive under-hood conditions - Toshiba explicitly restricts its use in equipment requiring extraordinarily high reliability, including automotive ECUs, airbag controllers, and powertrain systems. For such applications, AEC-Q100-qualified alternatives must be selected; the 74HC237D is intended for industrial, commercial, and general-purpose embedded use.