Nexperia USA Inc. 74HC42D,652

Overview

74HC42D,652 from Nexperia USA Inc. is a high-speed CMOS BCD-to-decimal decoder designed for decimal output selection, logic expansion, display-related decoding, control-line generation, demultiplexing, and embedded digital logic applications. The device accepts four BCD inputs and provides ten mutually exclusive active LOW decimal outputs, with all outputs remaining HIGH when binary input codes greater than nine are applied.

As part of the Nexperia 74HC logic portfolio, 74HC42D,652 combines a 2.0V to 6.0V supply range, CMOS input levels, low power dissipation, high noise immunity, 1-of-10 decoding, 1-of-8 demultiplexing capability, disabled outputs for invalid BCD codes, and clamp-diode input protection for flexible digital logic integration. For engineers reviewing the 74HC42D,652 datasheet, 74HC42D,652 pinout, 74HC42D,652 application, or 74HC42D,652 equivalent, this device is widely used in decimal decoding, BCD logic systems, digital control circuits, microcontroller output expansion, display selection logic, industrial boards, and general-purpose CMOS logic designs.

Technical Context

In digital systems, 74HC42D,652 operates as a BCD-to-decimal decoder by translating the four BCD inputs, 0A to 3A, into one selected output among 0Y to 9Y. The outputs are active LOW, so the selected decimal output goes LOW while the remaining outputs stay HIGH.

The logic design disables all outputs for binary input codes above nine. This behavior is useful in BCD-based systems because invalid input combinations from 1010 to 1111 do not incorrectly select a decimal output. The most significant input, 3A, can also act as an inhibit function when the device is used as a 1-of-8 decoder.

74HC42D,652 can also be used in 1-of-8 demultiplexer applications. In this mode, the 3A input can function as the data input while the lower address inputs select the output path. This makes the device useful not only for decimal decoding but also for simple signal routing and address-qualified control-line generation in CMOS logic systems.

Key Specifications

Pinout & Package

The 74HC42D,652 pinout uses a 16-lead SO16 package with four BCD inputs, ten active LOW decimal outputs, VCC, and GND. The output polarity is active LOW, so downstream decimal-select, enable, display, or control circuits should be checked for correct logic polarity during schematic design.

For PCB implementation, VCC should be bypassed close to the SO16 package, BCD inputs should be routed with clean logic transitions, and output loading should remain within logic-family limits. Since all outputs are HIGH for invalid BCD inputs above nine, the surrounding logic should define how these invalid states are handled at the system level.

Key Features

• BCD-to-decimal decoder with ten mutually exclusive active LOW outputs.
• Four BCD inputs decode valid decimal values from 0 through 9.
• All outputs remain HIGH for input codes above nine.
• Wide 2.0V to 6.0V operating supply range for CMOS logic systems.
• CMOS low power dissipation and high noise immunity.
• 1-of-8 demultiplexing capability using the most significant input as data input.
• Input clamp diodes support interfacing through current-limiting resistors.
• Useful for decimal selection, BCD logic, and control-line expansion.
• HBM and CDM ESD protection support robust handling and assembly.
• SO16 package supports standard surface-mount PCB designs.

Applications

Equivalent & Alternatives

When evaluating 74HC42D,652 equivalent devices, engineers should compare logic family, input threshold type, output polarity, supply-voltage range, package footprint, propagation delay, temperature range, ESD rating, invalid-code behavior, and pin-to-pin compatibility.

Compared with 74HCT42D, 74HC42D,652 is optimized for CMOS-input logic systems and wider 2.0V to 6.0V operation rather than TTL-level 5V input compatibility. 74HC42D,652 vs CD4028B selection depends on logic-family speed, voltage range, output loading, package footprint, invalid-code behavior, and sourcing continuity requirements.

Quality

74HC42D,652 should be sourced as original Nexperia components through traceable and controlled supply channels. Quality verification procedures may include package inspection, top-mark validation, solderability testing, pin continuity checks, input threshold verification, functional truth-table testing, invalid-code output verification, output-level measurement, and incoming inspection according to digital logic production requirements.

Because the device is often used for decimal decoding and control-line generation, system reliability depends on correct active LOW output interpretation, stable supply decoupling, clean BCD input timing, valid output loading, and proper handling of invalid BCD states. Traceable sourcing supports manufacturing quality and reduces counterfeit supply-chain risk for standard logic production programs.

Availability

74HC42D,652 available at Aetrix Electronics and suitable for BCD-to-decimal decoding, decimal output selection, demultiplexer circuits, embedded digital logic, industrial control boards, microcontroller expansion, display selection logic, and general-purpose CMOS logic systems requiring stable component supply and repeatable production support.

Supply support may include scheduled delivery planning, volume procurement support, BOM continuity assistance, traceable sourcing management, and long-term availability support for OEM manufacturers, embedded-system developers, industrial-control designers, logic-board builders, and electronics production programs.

For production deployment, confirming logic family, supply voltage, input threshold compatibility, output polarity, package footprint, invalid-code behavior, and sourcing continuity helps reduce procurement risk and improve manufacturing stability.

Manufacturer

Nexperia USA Inc. is part of Nexperia, a semiconductor manufacturer specializing in standard logic, ESD protection devices, MOSFETs, bipolar transistors, diodes, analog switches, power discretes, and interface components for automotive, industrial, communication, computing, and consumer electronics.

The Nexperia standard logic portfolio focuses on CMOS logic families, compact package options, broad voltage support, low power dissipation, high noise immunity, automotive and industrial-grade availability, and long-term supply continuity for embedded logic, interface control, level-compatible systems, and board-level digital designs.

FAQ

What is 74HC42D,652 used for?

74HC42D,652 is used for BCD-to-decimal decoding, decimal output selection, microcontroller output expansion, demultiplexing, display selection logic, control-line generation, and general-purpose CMOS digital logic.

Where can I find the 74HC42D,652 datasheet download?

The 74HC42D,652 datasheet is available from Nexperia and includes the functional description, pinout, truth table, operating conditions, static characteristics, switching specifications, package data, and ordering information.

What should be considered in 74HC42D,652 PCB design?

PCB implementation should provide close VCC decoupling, clean BCD input routing, correct active-low output polarity, controlled output loading, and suitable handling of invalid BCD input states above nine.

Are the outputs of 74HC42D,652 active LOW?

Yes. 74HC42D,652 provides ten active LOW decimal outputs. For valid BCD inputs, one selected output goes LOW while the other outputs remain HIGH.

What are common 74HC42D,652 equivalent solutions?

Common alternatives include 74HCT42D, CD4028B, SN74HC42D, and 74HC138D depending on input threshold requirements, output count, invalid-code behavior, package footprint, timing, and sourcing continuity.