Nexperia USA Inc. 74HCT4020PW-Q100J

Overview

74HCT4020PW-Q100 from Nexperia is an AEC-Q100 Grade 1 qualified 14-stage binary ripple counter with TTL-compatible inputs, asynchronous master reset (MR), and 12 buffered outputs (Q0, Q3–Q13). It advances on the HIGH-to-LOW clock edge, operates from 4.5 V to 5.5 V, delivers propagation delays as low as 18 ns (CP→Q0 at VCC = 4.5 V), and supports automotive ambient temperatures up to +125 °C - used in engine control timing dividers and ADAS clock domain isolation.

For engineers reviewing the 74HCT4020PW-Q100 datasheet, 74HCT4020PW-Q100 pinout, 74HCT4020PW-Q100 application, or 74HCT4020PW-Q100 equivalent, key selection criteria include its TTL-level input compatibility, guaranteed operation across -40 °C to +125 °C, 14-bit divide-by-16384 capability, MR-driven synchronous clear behavior, and TSSOP16 package suitability for high-density automotive PCBs.

Technical Context

This device implements a cascaded chain of 14 static toggle flip-flops, where each stage divides its input by two, yielding cumulative division ratios up to 2¹⁴ = 16384. The asynchronous MR input forces all outputs LOW independently of CP state, enabling deterministic reset without clock dependency.

Input clamping diodes allow safe interfacing to voltages exceeding VCC when used with current-limiting resistors. Output drive strength is specified at ±4.0 mA (VOH/VOL) under 4.5 V supply, supporting direct connection to standard CMOS/TTL loads without buffering.

Key Specifications

Pinout & Package

TSSOP16 plastic thin shrink small outline package (SOT403-1), 4.4 mm body width, 0.65 mm lead pitch, 16-terminal surface-mount design with exposed pad option (not electrically connected).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 14-stage binary counter applications.

Compared with 74HC4020PW-Q100 and SN74LV4020APWR, the 74HCT4020PW-Q100 uniquely bridges legacy TTL systems and automotive-grade reliability - its TTL input thresholds eliminate level shifters in existing 5 V controller designs while maintaining full AEC-Q100 compliance.

Availability

74HCT4020PW-Q100 is available at Aetrix Electronics and suitable for engine control units, ADAS camera synchronization, infotainment watchdog timers, and body control module time-delay circuits requiring stable component supply across automotive production lifecycles.

Supply support for 74HCT4020PW-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 specializing in high-volume, high-reliability logic, discrete, and MOSFET solutions for automotive, industrial, and mobile markets.

The 74HCT4020-Q100 belongs to Nexperia's automotive-qualified logic portfolio, engineered specifically for timing-critical functions in harsh-environment vehicle subsystems where AEC-Q100 Grade 1 validation is mandatory.

FAQ

What is the maximum clock frequency supported by the 74HCT4020PW-Q100?

The maximum operating frequency is 25 MHz at VCC = 4.5 V and CL = 50 pF, derived from the 54 ns maximum CP→Q0 propagation delay. At 5.0 V and CL = 15 pF, fmax rises to 52 MHz. Operation above these limits risks metastability and incorrect counting due to insufficient setup/hold margins between stages.

Can the 74HCT4020PW-Q100 be used with a 3.3 V supply?

No - the 74HCT4020PW-Q100 is specified only for 4.5 V to 5.5 V operation. Its TTL input thresholds require VIH ≥ 2.0 V and VIL ≤ 0.8 V, which are not guaranteed below 4.5 V. For 3.3 V systems, use the pin-compatible 74LVC4020 or 74AUP4020 families instead.

How does the asynchronous MR input behave during clock transitions?

The MR input is fully asynchronous: asserting MR HIGH immediately clears all internal flip-flops and forces Q0–Q13 LOW within tPHL(MR→Qn) ≤ 68 ns (max at VCC = 4.5 V), regardless of CP state or edge timing. This guarantees deterministic reset without waiting for clock edges or propagation through the ripple chain.

Are all 14 counter stages accessible at the package pins?

No - only Q0 and Q3 through Q13 (12 outputs total) are brought out to pins. Q1 and Q2 are internal nodes not available externally. This omission reduces pin count while retaining outputs needed for common division ratios (e.g., 8, 16, 32, 64, 128, ..., 8192, 16384).