NXP Semiconductors 74HC4017DB,118

Overview

74HC4017DB,118 from Nexperia is a CMOS Johnson decade counter IC with 10 decoded outputs (Q0–Q9), dual-edge-triggered clock inputs (CP0 and CP1), asynchronous master reset (MR), and carry output Q5-9 - operating across 2.0 V to 6.0 V supply, delivering 46 ns typical propagation delay at 4.5 V, and specified for -40 °C to +125 °C. It serves as a sequential state generator in LED chaser circuits, divide-by-N timing systems, and industrial step sequencers.

For engineers reviewing the 74HC4017DB,118 datasheet, 74HC4017DB,118 pinout, 74HC4017DB,118 application, or 74HC4017DB,118 equivalent, this device requires attention to its dual-clock edge sensitivity (CP0 rising / CP1 falling), Q5-9 carry logic for cascading, MR active-HIGH reset behavior, and SO16 package thermal derating above 110 °C.

Technical Context

The 74HC4017DB,118 implements a 5-stage Johnson counter architecture that auto-corrects illegal states within ≤11 clocks. Its decoding circuitry produces mutually exclusive HIGH pulses on Q0–Q9, with Q5-9 going LOW during states 5–9 to enable synchronous cascading of multiple devices.

It accepts CMOS-level inputs and features clamp diodes on all inputs, permitting safe interfacing to voltages exceeding VCC when used with current-limiting resistors. The device supports two independent clocking modes: CP0 advances on LOW-to-HIGH while CP1 = LOW; CP1 advances on HIGH-to-LOW while CP0 = HIGH.

Key Specifications

Pinout & Package

74HC4017DB,118 is housed in a plastic small outline package (SO16, SOT109-1) with 16 leads and 3.9 mm body width. Pin 1 is index-marked; the package is lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar decade counter applications.

Compared with 74HCT4017DB,118 and CD4017BE, the 74HC4017DB,118 offers optimal balance of speed, low-voltage operation, and ruggedness - making it preferred for modern embedded systems where 3.3 V compatibility and ESD resilience are critical.

Availability

74HC4017DB,118 is available at Aetrix Electronics and suitable for LED chaser displays, industrial step sequencers, divide-by-N timers, and automotive interior lighting control requiring stable component supply across extended temperature ranges.

Supply support for 74HC4017DB,118 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 leading semiconductor manufacturer specializing in high-performance logic, analog, and discrete components, with global R&D and manufacturing facilities focused on automotive-grade reliability.

The 74HC4017DB,118 belongs to Nexperia's 74HC logic family - designed for low-power, high-noise-immunity digital control in industrial automation, consumer electronics, and automotive subsystems.

FAQ

Can 74HC4017DB,118 operate at 3.3 V?

Yes. The 74HC4017DB,118 is fully specified from 2.0 V to 6.0 V, including 3.3 V operation. At VCC = 3.3 V, VOH ≥ 2.97 V and VOL ≤ 0.33 V with 4 mA load, meeting standard 3.3 V CMOS interface requirements. Propagation delay increases to ~65 ns, supporting up to ~15 MHz clock rates.

How does the Q5-9 output behave during counting?

Q5-9 is LOW only during counter states 5, 6, 7, 8, and 9 - remaining HIGH for states 0–4 and upon reset. This active-LOW carry signal is specifically intended to drive the CP0 input of a second 74HC4017DB,118, enabling seamless 20-step cascaded sequencing without external gating logic.

What happens if both CP0 and CP1 are HIGH simultaneously?

Per the function table, when CP0 = HIGH and CP1 = HIGH, the counter holds its current state - no advance occurs. However, the datasheet warns against enabling CP1 while CP0 is HIGH or CP0 while CP1 is LOW, as this may cause unintended extra counts due to metastability in the dual-clock latch structure.

Is the SO16 package thermally adequate for continuous 24 MHz operation?

At 24 MHz with CL = 50 pF and VCC = 4.5 V, dynamic power is ~12 mW. With SO16's 500 mW Ptot rating and 12.4 mW/K derating above 110 °C, junction temperature rise remains < 3 °C - well within safe limits. No heatsink is required for standard PCB layouts with 2 oz copper.