Diodes Incorporated 74AHCT1G02W5-7

Overview

74AHCT1G02W5-7 from Diodes Incorporated is a single 2-input positive NOR gate in SOT25 package, operating at 4.5V–5.5V supply, delivering ±8 mA output drive at 5.0V, with Schmitt-trigger inputs for noise immunity and CMOS low-power operation. It implements the Boolean function Y = A + B and is used in logic-level translation and signal conditioning within compact digital subsystems.

For engineers reviewing the 74AHCT1G02W5-7 datasheet, 74AHCT1G02W5-7 pinout, 74AHCT1G02W5-7 application, or 74AHCT1G02W5-7 equivalent, key selection criteria include input hysteresis margin, propagation delay under 7.0 ns (CL = 50 pF), output drive capability at 5 V, and compatibility with TTL-level input thresholds in mixed-logic systems.

Technical Context

This device belongs to the AHCT logic family, offering TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max) while maintaining CMOS power efficiency. Its Schmitt-trigger inputs provide 0.4 V typical hysteresis, enabling robust operation with slow-rising or noisy control signals.

The NOR gate uses standard totem-pole CMOS output stage, supporting rail-to-rail switching with VOH ≥ 3.70 V and VOL ≤ 0.55 V at IOL/IOH = ±8 mA. Propagation delay is specified down to 0.6 ns (typical) at CL = 15 pF and 5 V supply.

Key Specifications

Pinout & Package

SOT25 (5-pin SC-74A) package: ultra-compact surface-mount outline with 0.95 mm body height and 0.65 mm pitch; thermally optimized for FR-4 PCBs with θJA = 204°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AHCT1G02DBVR and 74LVC1G02GW, the 74AHCT1G02W5-7 offers superior noise margin via Schmitt inputs and best-in-class thermal performance in SOT25, making it optimal for industrial control and automotive body electronics where signal integrity and thermal reliability are critical.

Availability

74AHCT1G02W5-7 is available at Aetrix Electronics and suitable for PC motherboard management, industrial PLC I/O modules, and consumer audio/video control logic requiring stable component supply across extended temperature ranges.

Supply support for 74AHCT1G02W5-7 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability, cost-optimized components for industrial, computing, and consumer markets.

The 74AHCT logic family targets interoperability between legacy TTL and modern CMOS systems, emphasizing robust input thresholds, low static power, and compact packaging for space-constrained digital interfaces.

FAQ

What is the maximum operating temperature range for the 74AHCT1G02W5-7?

The device is rated for operation from –40°C to +125°C ambient temperature, with junction temperature reaching up to +150°C under defined thermal conditions. This rating is validated per JEDEC JESD78 Class II latch-up testing and supported by θJA = 204°C/W in SOT25 mounting per Diodes Inc. AP02001 layout guidelines.

Does the 74AHCT1G02W5-7 require external pull-up or pull-down resistors on unused inputs?

Yes - unused inputs must be tied to either VCC or GND to prevent floating states that cause increased ICC, erratic output behavior, or localized heating. The datasheet explicitly states this in Note 3 under Recommended Operating Conditions, as floating CMOS inputs can bias internal transistors into linear conduction.

Can the 74AHCT1G02W5-7 drive a 50 pF capacitive load within its specified propagation delay?

Yes - the datasheet guarantees tpd ≤ 9.5 ns (max) at CL = 50 pF and VCC = 4.5 V over –40°C to +125°C. Measured at 5 V, typical delay is 4.9 ns, confirming reliable timing margin for moderate-speed digital interconnects such as front-panel controls or sensor interface buses.

Is the 74AHCT1G02W5-7 compatible with 3.3 V logic systems?

No - it is not designed for 3.3 V operation. Its minimum VCC is 4.5 V, and VIH/VIL thresholds are fixed for TTL compatibility. Applying 3.3 V supply risks undefined output states and excessive ICC due to partial transistor turn-on; use 74LVC1G02 or similar for 3.3 V systems.