Nexperia USA Inc. 74HC21D,653

Overview

74HC21D,653 from Nexperia is a dual 4-input CMOS AND gate in SO14 package, operating from 2.0 V to 6.0 V supply, delivering propagation delays as low as 10 ns at 5.0 V/15 pF, with ±25 mA output drive capability and guaranteed operation from -40 °C to +125 °C - used for digital logic level combination in industrial control sequencers and sensor interface signal conditioning.

For engineers reviewing the 74HC21D,653 datasheet, 74HC21D,653 pinout, 74HC21D,653 application, or 74HC21D,653 equivalent, key selection criteria include input voltage thresholds (VIH = 3.15 V min at VCC = 4.5 V), output drive strength under load, thermal stability across extended temperature range, and SO14 package compatibility with legacy PCB footprints.

Technical Context

This device implements two independent 4-input AND functions using standard CMOS silicon technology, with integrated input clamp diodes enabling safe interfacing to voltages exceeding VCC when current-limiting resistors are used. Each gate exhibits symmetrical HIGH/LOW output voltage levels and supports rail-to-rail input logic thresholds compliant with JEDEC JESD7A and JESD8C standards.

Propagation delay is characterized across three supply voltages (2.0 V, 4.5 V, 6.0 V) and load conditions (CL = 15 pF), with worst-case tpd of 165 ns at 2.0 V and 33 ns at 4.5 V. Static power consumption remains ultra-low (ICC ≤ 2.0 μA typical at VCC = 6.0 V), while dynamic power is governed by CPD = 15 pF and switching frequency.

Key Specifications

Pinout & Package

74HC21D,653 uses the SOT108-1 (SO14) plastic small outline package: 14-pin, 3.9 mm body width, 1.27 mm lead pitch, gull-wing leads, JEDEC MS-012 compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual 4-input AND gate applications.

Compared with 74HC21D,653, the 74HC21PW,118 offers superior thermal efficiency in dense layouts, while SN74HC21DR trades marginally improved noise immunity for higher quiescent current - choice depends on footprint constraints and system-level power/noise trade-offs.

Availability

74HC21D,653 is available at Aetrix Electronics and suitable for industrial automation controllers, automotive body electronics, medical device safety logic, and test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HC21D,653 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 headquartered in Nijmegen, Netherlands, specializing in high-volume logic, analog, and discrete components with emphasis on reliability, efficiency, and manufacturability.

The 74HC21 belongs to Nexperia's 74HC High-Speed CMOS logic family, designed specifically for low-power, high-noise-immunity digital interfacing in industrial, automotive, and consumer applications where robustness and consistent timing are critical.

FAQ

Can 74HC21D,653 operate reliably at 2.0 V supply?

Yes - the device is fully specified from 2.0 V to 6.0 V. At 2.0 V, it delivers VIH ≥ 1.5 V, VIL ≤ 0.5 V, and tpd ≤ 110 ns (typical 33 ns) with CL = 15 pF. All DC and AC parameters are guaranteed across this range per Table 5 and Table 7 of the datasheet.

What is the maximum capacitive load the outputs can drive?

The outputs are characterized up to 15 pF (Table 7), but can drive higher loads with increased propagation delay and reduced edge rate. For CL > 50 pF, transition time increases to ~19 ns (VCC = 6.0 V), and output voltage swing degrades slightly - design margin should include 20 % derating for robust timing closure.

Are pins 3 and 11 internally connected?

No - pins 3 and 11 are explicitly designated "n.c." (not connected) in Table 2 and the pinning diagrams. They are electrically isolated from all internal circuitry and must remain unconnected; tying them to VCC, GND, or signals violates the datasheet and risks undefined behavior.

Does 74HC21D,653 support mixed-voltage interfacing?

Yes - input clamp diodes allow safe interfacing to voltages exceeding VCC when used with current-limiting resistors (Section 1). For example, 5 V signals can be applied to inputs while VCC = 3.3 V, provided series resistance limits IV to < ±20 mA per Table 4.