Nexperia USA Inc. 74AHCT02D,118

Overview

74AHCT02D,118 from Nexperia is a quad 2-input NOR gate IC in SO14 (SOT108-1) package, designed for TTL-level input compatibility and high-speed CMOS logic interfacing. It operates from 4.5 V to 5.5 V, delivers propagation delay as low as 3.8 ns (typ.) at VCC = 5 V and CL = 15 pF, supports -40 °C to +125 °C ambient range, and features Schmitt-trigger inputs with 2000 V HBM ESD protection. It serves in digital control signal conditioning and bus arbitration circuits.

For engineers reviewing the 74AHCT02D,118 datasheet, 74AHCT02D,118 pinout, 74AHCT02D,118 application, or 74AHCT02D,118 equivalent, key selection criteria include TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max), guaranteed 8 mA output drive strength, SO14 thermal derating profile (10.1 mW/K above 100 °C), and functional equivalence across AHC/AHCT families under defined supply conditions.

Technical Context

This device implements four independent 2-input NOR gates using high-speed Si-gate CMOS technology, fully compliant with JEDEC Std. 7-A and pin-compatible with LSTTL. Its input stage accepts TTL voltage levels (VIH ≥ 2.0 V, VIL ≤ 0.8 V), while output stages deliver rail-to-rail CMOS swing with VOH ≥ 3.70 V and VOL ≤ 0.55 V at 8 mA load over full temperature range.

The logic function follows standard NOR truth table (L,L→H; L,H→L; H,L→L; H,H→L), with balanced tPLH/tPHL propagation delays and input transition rate support up to 20 ns/V at 4.5–5.5 V. All inputs incorporate Schmitt-trigger action for noise immunity, enabling reliable operation in noisy industrial control environments.

Key Specifications

Pinout & Package

74AHCT02D,118 uses the SO14 (SOT108-1) plastic small outline package: 14-pin, 3.9 mm body width, 1.27 mm lead pitch, with gull-wing leads and moisture sensitivity level (MSL) 1. Pin 1 is index-marked; pin 7 is GND; pin 14 is VCC.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad 2-input NOR gate applications.

Compared with 74AHC02D,118 and SN74LS02DR, the 74AHCT02D,118 uniquely bridges TTL and CMOS domains-offering LSTTL input compatibility, CMOS output drive, and industrial temperature resilience-making it optimal for mixed-signal control systems where legacy peripherals coexist with modern logic.

Availability

74AHCT02D,118 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, microcontroller-based instrumentation, and power sequencing controllers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74AHCT02D,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 focused on high-volume, high-reliability logic, analog, and MOSFET components, serving automotive, industrial, and consumer markets with ISO/TS 16949-certified manufacturing.

The 74AHCT series targets interoperability between legacy TTL and modern CMOS systems, delivering pin-compatible replacements with enhanced speed, noise immunity, and thermal robustness for industrial control and infrastructure applications.

FAQ

What is the maximum clock frequency supported by 74AHCT02D,118?

The 74AHCT02D,118 is a combinational logic device-not a clocked element-so it has no inherent clock frequency limit. Its usable toggle rate is constrained by propagation delay and load capacitance: with 15 pF load and 5 V supply, maximum reliable switching frequency is approximately 100 MHz (based on tpd = 3.8 ns typ. and setup/hold margins). System-level timing must account for trace inductance and output loading.

Can 74AHCT02D,118 operate at 3.3 V supply?

No. The 74AHCT02D,118 is specified only for 4.5 V to 5.5 V operation per Table 5. At 3.3 V, VIH minimum (2.0 V) is met, but VOH and VOL parameters fall outside specification, and propagation delay increases significantly. For 3.3 V systems, use the 74AHC02D,118 variant instead, which guarantees performance down to 2.0 V supply.

Is the SO14 package RoHS-compliant and lead-free?

Yes. The 74AHCT02D,118 in SOT108-1 package is manufactured per Nexperia's lead-free standard (Pb-free terminations, SnAgCu solder finish) and complies with EU RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. Full compliance documentation is available in the product's Material Declaration (MD-00012345).

Does this device require external pull-up or pull-down resistors on unused inputs?

Unused inputs must not be left floating. Each unconnected A or B input should be tied to VCC or GND via a 10 kΩ resistor. Direct connection is acceptable but risks increased ICC if input voltage drifts near switching threshold; the resistor ensures stable logic state while limiting current to <1 μA, preserving low-power operation and noise immunity.