Nexperia USA Inc. 74HC237D,653

Overview

74HC237D,653 from Nexperia is a 3-to-8 line decoder/demultiplexer with integrated address latches, operating across 2.0 V–6.0 V supply, delivering active LOW mutually exclusive outputs, latch enable (LE) control for stored-address operation, and dual output enables (E1 active LOW, E2 active HIGH). It functions as a non-overlapping decoder in 3-state bus systems and supports strobe-based address storage in memory-mapped I/O designs.

For engineers reviewing the 74HC237D,653 datasheet, 74HC237D,653 pinout, 74HC237D,653 application, or 74HC237D,653 equivalent, key selection considerations include latch timing (t_su = 9 ns @ V_CC = 6.0 V), propagation delay (t_pd = 15 ns @ V_CC = 6.0 V, CL = 50 pF), output drive capability (±4.0 mA @ V_CC = 4.5 V), and industrial temperature range (-40 °C to +125 °C).

Technical Context

The 74HC237D implements a synchronous 3-bit address latch combined with a 3-to-8 decoder core, where LE transition from LOW to HIGH captures and holds A0–A2 inputs independently of subsequent address changes. Output state is governed by the logical AND of E1 (LOW) and E2 (HIGH), enabling independent gating of all eight Y0–Y7 outputs regardless of latch or decode state.

Its CMOS architecture ensures high noise immunity (VIH/VIL thresholds scale with V_CC), latch-up immunity >100 mA per JESD78 Class II Level B, and compatibility with TTL input levels. The device supports bus-oriented strobing via LE-controlled address freeze and permits cascaded expansion using E1/E2 for hierarchical decoding.

Key Specifications

Pinout & Package

74HC237D,653 is housed in a plastic small outline package (SO16, SOT109-1) with 16 leads and 3.9 mm body width, optimized for automated assembly and thermal reliability in industrial PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC237D,653, the 74HC238D,653 lacks latch capability and requires external storage, while the SN74LV138AD offers superior speed and drive but omits latching entirely - making the 74HC237D,653 uniquely suited for applications demanding integrated address capture and hold.

Availability

74HC237D,653 is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive engine control modules, medical diagnostic equipment, and test instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HC237D,653 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

Nexperia is a global semiconductor expert specializing in high-performance, energy-efficient logic, discrete, and MOSFET devices, with manufacturing rooted in process innovation and automotive-grade quality systems.

The 74HC237 belongs to Nexperia's HC logic family, designed for robust, low-power decoding and demultiplexing in industrial and automotive control systems where latch synchronization and wide voltage operation are critical.

FAQ

What is the minimum pulse width required on the LE input to reliably capture address data?

The LE input requires a minimum HIGH pulse width of 9 ns at V_CC = 6.0 V to ensure stable latching of A0–A2 inputs. This value increases to 13 ns at V_CC = 4.5 V and 75 ns at V_CC = 2.0 V per datasheet Table 7. Designers must ensure LE timing meets these limits under worst-case voltage and temperature conditions.

Can 74HC237D,653 drive LEDs directly without current-limiting resistors?

No. While the outputs can sink up to 4.0 mA at V_CC = 4.5 V, driving an LED directly risks exceeding absolute maximum ratings and causing premature wear. A series resistor (e.g., 330 Ω for 5 V supply and 10 mA target) is mandatory to limit current and ensure long-term reliability per JEDEC JESD78 latch-up specifications.

How does the dual-enable logic (E1 and E2) affect output states during power-up?

At power-up, E1 and E2 default to indeterminate states until stabilized. To prevent spurious outputs, tie E1 to GND (active LOW) and E2 to V_CC (active HIGH) via pull-down/pull-up resistors. Only then will outputs remain HIGH until valid enable conditions are met, avoiding unintended peripheral activation during boot.

Is 74HC237D,653 pin-compatible with older 74HCT237 variants?

Yes - 74HC237D,653 shares identical SO16 pinout, logic function, and DC characteristics with 74HCT237, but differs in AC performance and input threshold behavior. The HC version operates over wider V_CC (2.0–6.0 V) and exhibits slower propagation delays than HCT at 5 V, requiring timing revalidation in legacy HCT designs.