Nexperia USA Inc. 74HC21PW,118

Overview

74HC21PW,118 from Nexperia is a dual 4-input CMOS AND gate in TSSOP14 package, operating from 2.0 V to 6.0 V supply, with propagation delay as low as 10 ns at 5.0 V/15 pF, ±25 mA output drive, and specified for -40 °C to +125 °C industrial temperature range - used in digital logic control, bus gating, and enable signal conditioning in embedded microcontroller interfaces.

For engineers reviewing the 74HC21PW,118 datasheet, 74HC21PW,118 pinout, 74HC21PW,118 application, or 74HC21PW,118 equivalent, key selection criteria include input voltage thresholds (VIH = 3.15 V min at VCC = 4.5 V), output drive capability (VOH = 3.98 V min at IO = -4.0 mA), thermal derating (7.3 mW/K above 81 °C), and n.c. pin handling in PCB layout.

Technical Context

The 74HC21PW 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 across its full operating voltage and temperature range.

Its logic behavior follows strict Boolean AND truth table: output is HIGH only when all four inputs per gate are HIGH; all other combinations yield LOW. Propagation delays are characterized separately for rising (tPLH) and falling (tPHL) edges, with typical values of 10 ns (VCC = 5.0 V, CL = 15 pF) and transition times under 13 ns at 6.0 V.

Key Specifications

Pinout & Package

TSSOP14 package (SOT402-1): 4.4 mm body width, 0.65 mm lead pitch, 1.20 mm max height - optimized for high-density PCB routing and automated optical inspection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC21DR and 74AHC21PW,118, the 74HC21PW,118 offers optimal balance of density, thermal performance, and 6 V tolerance - making it preferred for space-constrained industrial controllers where mixed-voltage interoperability and +125 °C operation are mandatory.

Availability

74HC21PW,118 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, medical infusion pump controllers, and test equipment signal gating requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HC21PW,118 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 with focus on efficiency, reliability, and sustainability - headquartered in Nijmegen, Netherlands.

The 74HC21 belongs to Nexperia's industry-standard 74HC logic family, designed for robust, low-power digital signal conditioning in harsh environments where wide voltage operation and extended temperature stability are essential.

FAQ

What is the maximum clock frequency supported by the 74HC21PW,118?

The 74HC21PW,118 is not a clocked device but a combinational logic gate with propagation delay of 10 ns typical at 5.0 V/15 pF. Its usable toggle rate depends on system-level timing margins, but it reliably supports asynchronous signal paths up to ~30 MHz in well-designed layouts with controlled trace impedance and proper decoupling.

Can pins 3 and 11 be connected to ground or left floating?

Pins 3 and 11 are explicitly marked "n.c." (not connected) in the datasheet and have no internal bond wire. They must remain unconnected - neither tied to GND nor VCC - to avoid parasitic coupling or unintended current paths that could affect noise immunity or thermal performance in the TSSOP package.

Does the 74HC21PW,118 support 3.3 V-only operation with guaranteed VIH/VIL margins?

Yes: at VCC = 3.3 V, VIH is guaranteed ≥2.0 V and VIL ≤1.1 V per datasheet Table 6, providing >0.9 V noise margin for standard 3.3 V CMOS drivers. Input thresholds scale linearly with VCC, ensuring compatibility with 3.3 V microcontrollers without level translation.

How does thermal derating affect power dissipation in the TSSOP package?

For the SOT402-1 (TSSOP14) package, total power dissipation is rated at 500 mW up to 81 °C ambient; above that, it derates linearly at 7.3 mW/°C. At 100 °C ambient, maximum allowable Ptot drops to 364 mW - requiring careful thermal design including copper pour, airflow, and adjacent heat source isolation.