Nexperia USA Inc. 74HCT4017BQ,115

Overview

74HCT4017BQ,115 from Nexperia is a TTL-level-compatible 5-stage Johnson decade counter IC with 10 decoded outputs (Q0–Q9), dual-edge-triggered clock inputs (CP0 rising-edge, CP1 falling-edge), asynchronous master reset (MR), and carry output Q5-9. It operates from 4.5 V to 5.5 V, delivers propagation delays as low as 20 ns at VCC = 4.5 V, and supports industrial temperature range (−40 °C to +125 °C). It is used in sequential LED drivers, divide-by-N timing circuits, and state-machine controllers where deterministic single-output activation per clock cycle is required.

For engineers reviewing the 74HCT4017BQ,115 datasheet, 74HCT4017BQ,115 pinout, 74HCT4017BQ,115 application, or 74HCT4017BQ,115 equivalent, this device serves as a precision decade counter for discrete logic sequencing, clock division, and decoded output control-requiring attention to MR timing constraints, CP0/CP1 mutual exclusion, and Q5-9 cascade enable logic.

Technical Context

The 74HCT4017BQ,115 implements a 5-flip-flop Johnson counter architecture that generates mutually exclusive active-HIGH decoded outputs across ten states. Its dual-clock interface allows flexible triggering: CP0 advances on LOW-to-HIGH while CP1 = LOW; CP1 advances on HIGH-to-LOW while CP0 = HIGH-preventing unintended counting when both clocks are active.

Internal automatic code correction ensures recovery from illegal states within ≤11 clocks. The Q5-9 output is LOW during states 5–9, enabling direct cascading to the CP0 of a downstream counter. MR is asynchronous, overriding all clock activity to force Q0 = HIGH and Q1–Q9 = LOW.

Key Specifications

Pinout & Package

DHVQFN16 (SOT763-1) package: 2.5 mm × 3.5 mm × 0.85 mm body, 16-terminal no-lead quad flat design with exposed thermal pad (non-soldered by default); optimized for space-constrained PCBs and improved thermal performance over SO16/TSSOP.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC4017BQ,115 and CD4017BE, the 74HCT4017BQ,115 uniquely balances TTL compatibility, dual-clock control, and industrial temperature rating-making it optimal for new 5 V embedded sequencer designs requiring robustness and interface simplicity.

Availability

74HCT4017BQ,115 is available at Aetrix Electronics and suitable for LED chaser circuits, divide-by-N timing generators, stepper motor controllers, and industrial state-machine supervisors requiring stable component supply across automotive, industrial automation, and consumer electronics programs.

Supply support for 74HCT4017BQ,115 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-volume, high-reliability logic, analog, and discrete components-delivering scalable solutions for automotive, industrial, and mobile markets.

The 74HCT4017BQ,115 belongs to Nexperia's 74HCT logic family, engineered for TTL-compatible interfacing in 5 V systems where noise immunity, low power, and guaranteed industrial temperature operation are essential.

FAQ

What is the function of the Q5-9 output?

The Q5-9 output is an active-LOW carry signal that remains LOW during counter states 5 through 9. It is designed specifically to drive the CP0 input of a second 74HCT4017BQ,115 in cascade configurations-enabling seamless expansion to 20, 30, or more decoded states without external combinational logic. Its timing aligns with internal Johnson counter progression and is validated across the full −40 °C to +125 °C operating range.

Can CP0 and CP1 be used simultaneously?

No-CP0 and CP1 must not be active simultaneously. The device advances only when CP0 receives a LOW-to-HIGH transition while CP1 = LOW, or CP1 receives a HIGH-to-LOW transition while CP0 = HIGH. Enabling both clocks concurrently violates the specified functional table and may cause unpredictable counting, skipped states, or metastability. Designers must enforce mutual exclusion via gating logic or controller sequencing.

How does the MR pin behave during power-up?

The MR pin is asynchronous and active HIGH, meaning any HIGH pulse-regardless of clock activity-forces immediate reset: Q0 goes HIGH, Q1–Q9 go LOW, and Q5-9 goes HIGH. During power-up, if MR is left floating or pulled LOW, the counter enters an undefined state until the first valid clock edge. For deterministic initialization, MR should be held LOW via RC network or supervisor IC until VCC stabilizes, then released to allow controlled start.

Is the DHVQFN16 package lead-free and RoHS compliant?

Yes-the 74HCT4017BQ,115 in SOT763-1 (DHVQFN16) package is manufactured with lead-free terminations and fully complies with EU RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. Nexperia confirms homogeneous material compliance for all package elements, including the copper leadframe, mold compound, and die attach-verified per J-STD-020 moisture sensitivity level 3 (MSL3) reflow profile.