Nexperia USA Inc. 74HCT4520D-Q100J

Overview

74HCT4520D-Q100 from Nexperia is an automotive-qualified dual 4-bit synchronous binary counter with two independent clock inputs (nCP0, nCP1), asynchronous master reset (nMR), and buffered outputs (nQ0–nQ3 per counter). It operates from 4.5 V to 5.5 V, supports -40 °C to +125 °C ambient range, and advances on either LOW-to-HIGH nCP0 (with nCP1 HIGH) or HIGH-to-LOW nCP1 (with nCP0 LOW). It is used in multistage synchronous counting and frequency division within engine control units and ADAS timing subsystems.

For engineers reviewing the 74HCT4520D-Q100 datasheet, 74HCT4520D-Q100 pinout, 74HCT4520D-Q100 application, or 74HCT4520D-Q100 equivalent, key selection criteria include its dual-counter architecture, TTL-compatible input thresholds, AEC-Q100 Grade 1 qualification, propagation delay ≤80 ns at 4.5 V, and SO16 package compatibility with automotive PCB layout constraints.

Technical Context

This device implements two independent 4-bit synchronous binary counters sharing no internal state-each has dedicated clock inputs (nCP0/nCP1), reset (nMR), and outputs (nQ0–nQ3). Clocking logic allows flexible edge-triggered operation: counter advances on rising edge of nCP0 when nCP1 = HIGH, or falling edge of nCP1 when nCP0 = LOW-enabling use as a gated or dual-edge counter.

The design includes clamp diodes on all inputs for overvoltage tolerance, CMOS-level power efficiency (<160 µA ICC max at 125 °C), and robust noise immunity (VIH ≥2.0 V, VIL ≤0.8 V at VCC = 4.5–5.5 V). It complies with JEDEC JESD8C and JESD7A standards and meets AEC-Q100 Grade 1 stress testing requirements.

Key Specifications

Pinout & Package

74HCT4520D-Q100 uses the plastic small outline package SOT109-1 (SO16) with 16 leads and 3.9 mm body width. Pin 1 is index-marked; pins are arranged in dual-in-line configuration with GND (pin 8) and VCC (pin 16) positioned for optimal decoupling.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual 4-bit synchronous counter applications.

Compared with 74HC4520D-Q100 and SN74LV4520ADT, the 74HCT4520D-Q100 uniquely balances TTL input compatibility, AEC-Q100 Grade 1 assurance, and 12.5 MHz worst-case operation at 125 °C - making it the preferred choice for 5 V engine and safety-critical subsystems where signal integrity and qualification rigor are non-negotiable.

Availability

74HCT4520D-Q100 is available at Aetrix Electronics and suitable for engine control units, ADAS camera synchronization, and transmission control modules requiring stable component supply across extended temperature ranges and automotive production lifecycles.

Supply support for 74HCT4520D-Q100 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 delivering high-performance, reliable logic, analog, and MOSFET solutions with focus on automotive, industrial, and mobile markets.

The 74HCT4520D-Q100 belongs to Nexperia's automotive-qualified logic portfolio, designed specifically for timing-critical subsystems in powertrain, chassis, and driver-assistance applications where AEC-Q100 compliance and thermal robustness are mandatory.

FAQ

What is the maximum clock frequency supported by 74HCT4520D-Q100 at 125 °C?

At VCC = 4.5 V and Tamb = +125 °C, the maximum guaranteed clock frequency is 20 MHz for both nCP0 and nCP1 inputs, based on tW (pulse width) and fmax specifications in the datasheet. This ensures reliable operation in under-hood environments without derating beyond the qualified temperature range.

Can 74HCT4520D-Q100 be used with a 3.3 V microcontroller I/O interface?

No - 74HCT4520D-Q100 requires VCC = 4.5–5.5 V and has TTL input thresholds (VIH ≥2.0 V, VIL ≤0.8 V). Driving it directly from 3.3 V logic risks marginal VIH margin and may cause metastability. A level shifter or 74LV4520ADT variant is recommended for 3.3 V systems.

How does the dual-clock architecture improve timing flexibility compared to single-clock counters?

The independent nCP0 (rising-edge) and nCP1 (falling-edge) inputs allow one to serve as a clock enable: holding nCP0 LOW disables counting while nCP1 toggles freely, and vice versa. This eliminates external gating logic and reduces propagation delay in cascaded or conditional counting schemes.

Is the SO16 (SOT109-1) package RoHS and REACH compliant?

Yes - Nexperia confirms the SOT109-1 package for 74HCT4520D-Q100 meets RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006, with lead-free terminations and halogen-free molding compound, as documented in Nexperia's material declarations.