Renesas 74HC42FPEL-E

Overview

74HC42FPEL-E from Renesas Electronics is a high-speed CMOS BCD-to-decimal decoder IC in 16-pin SOP package, operating from 2 V to 6 V supply, with typical propagation delay of 13 ns (CL = 50 pF), fanout of 10 LSTTL loads, and low quiescent current (4 µA max at 25°C). It drives one of ten active-low outputs based on valid BCD input (0–9), used in address decoding, display multiplexing, and digital logic selection circuits.

For engineers reviewing the 74HC42FPEL-E datasheet, 74HC42FPEL-E pinout, 74HC42FPEL-E application, or 74HC42FPEL-E equivalent, key selection criteria include its BCD decoding function, active-low open-drain-compatible outputs, wide VCC range (2–6 V), guaranteed operation from –40°C to +85°C, and JEITA-standard SOP-16 (FP-16DAV) packaging for surface-mount compatibility.

Technical Context

The 74HC42FPEL-E implements combinational logic decoding using standard HC-series CMOS circuitry, with all inputs and outputs referenced to a single VCC/GND rail. Its truth table strictly enforces BCD validity: only inputs 0000–1001 activate exactly one output low; all other combinations force all outputs high.

No internal latching or clocking is present - it is purely asynchronous. Output drive capability supports ±25 mA per pin under absolute maximum ratings, while recommended operating conditions specify input rise/fall times ≤ 400 ns (at VCC = 6 V) to ensure reliable switching behavior across temperature.

Key Specifications

Pinout & Package

SOP-16 package (JEITA PRSP0016DH-B, Renesas code FP-16DAV), 3.95 mm × 9.9 mm body, 1.27 mm pitch, gull-wing leads, Ni/Pd/Au plating, mass 0.24 g.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar BCD decoding applications.

Compared with 74HC42FPEL-E, SN74HC42DR offers identical functionality with marginal timing degradation, while 74HCT42PW,118 trades universal VCC flexibility for guaranteed TTL input compatibility - making the 74HC42FPEL-E optimal for cost-sensitive, wide-voltage industrial control where BCD decoding stability across 2–6 V is essential.

Availability

74HC42FPEL-E is available at Aetrix Electronics and suitable for industrial control panels, test equipment front-ends, and embedded display subsystems requiring stable component supply, long-term manufacturability, and RoHS-compliant sourcing.

Supply support for 74HC42FPEL-E 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

Renesas Electronics Corporation is a Japanese semiconductor manufacturer specializing in microcontrollers, analog, power, and logic devices for industrial, automotive, and infrastructure markets.

The HD74HC42 product line delivers standardized high-speed CMOS logic functions targeting cost-effective, reliable digital interfacing in non-safety-critical industrial and consumer equipment.

FAQ

What is the logic family and technology node of the 74HC42FPEL-E?

The 74HC42FPEL-E belongs to the high-speed CMOS (HC) logic family, fabricated using silicon-gate CMOS process technology. It is not a deep-submicron or advanced-node device; rather, it implements standard HC-series characteristics including high noise immunity, low power, and compatibility with both 3.3 V and 5 V systems. The 74HC42FPEL-E operates reliably across its full 2–6 V supply range without requiring process-specific biasing or derating.

Does the 74HC42FPEL-E support latched or registered operation?

No, the 74HC42FPEL-E is purely combinational logic with no internal storage elements. It performs real-time BCD-to-decimal translation without clocks, registers, or memory. All outputs respond asynchronously to input changes within the specified propagation delay. If latched behavior is required, external flip-flops or a microcontroller must be used to hold BCD inputs stable during decode - the 74HC42FPEL-E itself provides no edge-triggered or level-sensitive latch functionality.

Can the 74HC42FPEL-E drive LEDs directly?

Yes, the 74HC42FPEL-E can drive common-anode LEDs directly via its active-low outputs (0Y–9Y), provided current-limiting resistors are used. Each output sinks up to 4 mA (typical) at VOL ≤ 0.33 V with VCC = 4.5 V, and up to 5.2 mA under worst-case conditions. For standard 2 mA LED segments, a 1 kΩ resistor with 5 V supply yields ~3 mA sink current - well within specification. Always verify thermal dissipation if multiple outputs are active simultaneously.

What happens when invalid BCD codes (e.g., 1010) are applied to the 74HC42FPEL-E inputs?

When invalid BCD inputs (1010 through 1111) are applied to the 74HC42FPEL-E, all ten outputs (0Y–9Y) remain in the high state. This fail-safe behavior prevents unintended activation of downstream devices. The 74HC42FPEL-E does not assert any output or enter an undefined state - it simply holds all outputs high until a valid BCD code (0000–1001) is presented. This feature is intrinsic to the logic design and requires no external supervision.

Is the 74HC42FPEL-E pin-compatible with the older HD74HC42P (DIP-16) version?

No, the 74HC42FPEL-E (SOP-16, FP-16DAV) is not physically pin-compatible with the HD74HC42P (DIP-16, DP-16FV), though their electrical pin functions are identical. Pin numbering and physical layout differ: SOP uses gull-wing leads with 1.27 mm pitch and different pad geometry, while DIP uses through-hole leads with 2.54 mm pitch. PCB layout, stencil design, and reflow profile must be adapted - the 74HC42FPEL-E cannot be substituted onto a DIP footprint without adapter hardware or board revision.