Nexperia USA Inc. 74HC4520D-Q100J

Overview

74HC4520D-Q100 from Nexperia is an automotive-grade dual 4-bit synchronous binary counter IC with two independent clock inputs (nCP0, nCP1), asynchronous master reset (nMR), and buffered outputs (nQ0–nQ3 per counter). It operates from 2.0 V to 6.0 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 circuits within engine control units and body electronics.

For engineers reviewing the 74HC4520D-Q100 datasheet, 74HC4520D-Q100 pinout, 74HC4520D-Q100 application, or 74HC4520D-Q100 equivalent, key selection considerations include its dual-clock edge-triggering flexibility, AEC-Q100 Grade 1 qualification, SO16 package compatibility, and CMOS-level input compatibility for low-power automotive timing systems.

Technical Context

This device implements two independent 4-bit synchronous binary counters sharing no internal logic coupling-each has dedicated clock (nCP0/nCP1), reset (nMR), and output (nQ0–nQ3) terminals. Clocking is asymmetric: one input triggers on rising edge while the other triggers on falling edge, enabling flexible clock-enable or dual-signal synchronization roles without external gating.

The counter advances only when exactly one clock is active (nCP0↑ with nCP1=HIGH, or nCP1↓ with nCP0=LOW); all other combinations hold state. Asynchronous nMR overrides clocking and forces all eight outputs (1Q0–1Q3, 2Q0–2Q3) LOW regardless of clock states or supply voltage level.

Key Specifications

Pinout & Package

74HC4520D-Q100 uses the SOT109-1 plastic small outline package (SO16) with 16 leads and 3.9 mm body width. Pin numbering follows standard SO16 convention with pin 1 index marker at top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HCT4520D-Q100, the HC variant offers superior noise immunity and wider VCC tolerance but requires CMOS-level drivers; versus SN74LV4040APWR, it trades raw speed for architectural flexibility essential in multi-signal synchronization tasks.

Availability

74HC4520D-Q100 is available at Aetrix Electronics and suitable for engine control units, transmission control modules, and body control modules requiring stable component supply across automotive production lifecycles.

Supply support for 74HC4520D-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 logic, analog, and MOSFET solutions optimized for automotive, industrial, and consumer applications.

The 74HC4520-Q100 belongs to Nexperia's automotive-qualified logic family, designed specifically for robust timing, counting, and signal conditioning in harsh-temperature vehicle subsystems.

FAQ

What clock edge combinations cause counting to occur?

Counting advances only under two mutually exclusive conditions: (1) a LOW-to-HIGH transition on nCP0 while nCP1 is held HIGH, or (2) a HIGH-to-LOW transition on nCP1 while nCP0 is held LOW. All other clock transitions-including simultaneous edges or both clocks LOW/HIGH-hold the counter state unchanged, as confirmed in Table 3 (Function table) of the Rev. 4 datasheet.

Can nMR be used to reset only one counter?

No. Pins 7 (1MR) and 15 (2MR) are electrically isolated but functionally identical: each resets only its associated counter (1MR → Counter 1, 2MR → Counter 2). There is no shared reset; asserting 1MR does not affect outputs 2Q0–2Q3, and vice versa. This is verified by the functional diagram (Fig. 1) and pin description (Table 2).

Is the SO16 package RoHS-compliant and lead-free?

Yes. The SOT109-1 package used for 74HC4520D-Q100 is lead-free and fully compliant with RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006, as documented in Nexperia's official compliance statements and material declarations dated 2024.

How does input clamping diode protection affect interfacing with 12 V signals?

The integrated clamp diodes allow safe connection of inputs to voltages up to VCC + 0.5 V. To interface with 12 V signals, a series current-limiting resistor must be used-e.g., 10 kΩ limits IIK to <1.2 mA when VCC = 5 V, staying within the ±20 mA absolute maximum rating (Table 4). This method is explicitly endorsed in Section 1 of the datasheet.