Diodes Incorporated 74AHCT1G08SE-7

Overview

74AHCT1G08SE-7 from Diodes Incorporated is a single 2-input positive AND gate in SOT353 package, operating at 4.5V–5.5V supply, delivering ±8 mA output drive at 5.0V, with Schmitt-trigger inputs for noise immunity, and RoHS-compliant lead-free finish. It implements Boolean Y = A • B in general-purpose logic applications including PC peripherals and consumer audio/video systems.

For engineers reviewing the 74AHCT1G08SE-7 datasheet, 74AHCT1G08SE-7 pinout, 74AHCT1G08SE-7 application, or 74AHCT1G08SE-7 equivalent, key selection criteria include input hysteresis tolerance, propagation delay under 8.0 ns (CL=50pF), output drive capability at TTL-compatible levels, and thermal resistance of 371°C/W in SOT353.

Technical Context

This device belongs to the AHCT logic family, offering TTL-compatible input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) while maintaining CMOS power efficiency. Its Schmitt-trigger inputs provide hysteresis (typ. 0.3 V), enabling robust operation with slow-rising or noisy signals.

The gate uses standard totem-pole CMOS output structure, supporting rail-to-rail switching with VOH ≥ 3.70 V and VOL ≤ 0.55 V at IOL/IOH = ±8 mA. It is rated for operation from –40°C to +125°C ambient temperature and features latch-up immunity exceeding 100 mA per JESD78 Class II.

Key Specifications

Pinout & Package

SOT353 (5-pin small outline transistor) package with gull-wing leads, 1.2 mm body width, 2.1 mm length, and 0.65 mm pitch. Thermal resistance θJA = 371°C/W on FR-4 board with minimum pad layout.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 2-input AND gate applications.

Compared with 74AHCT1G08SE-7, the W5 variant offers superior thermal management in compact designs, while the SN74LVC1G08DBVR enables voltage translation but requires external filtering for marginal edge rates.

Availability

74AHCT1G08SE-7 is available at Aetrix Electronics and suitable for PC peripherals interface, consumer audio control, DVD player system reset, and industrial sensor signal conditioning requiring stable component supply across production lifecycles.

Supply support for 74AHCT1G08SE-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, headquartered in Plano, Texas, serving industrial, computing, communications, and consumer markets since 1966.

The AHCT logic family targets 5 V systems needing TTL-compatible inputs with CMOS efficiency; 74AHCT1G08SE-7 specifically addresses space-constrained, noise-prone logic gating in consumer and industrial edge devices.

FAQ

What is the maximum allowable input voltage for 74AHCT1G08SE-7?

The absolute maximum input voltage is –0.5 V to 6.5 V per the datasheet. However, recommended operation limits VI to 0–5.5 V. Exceeding 5.5 V risks damage or undefined behavior, even briefly. Inputs tied to 5 V systems with overshoot should include clamping diodes or series resistors to stay within safe margins.

Can unused inputs be left floating?

No. Unused inputs must be tied to VCC or GND per Note 3 in the datasheet. Floating inputs cause increased ICC, unpredictable output states, and potential oscillation due to internal node instability. For this single-gate device, if only one input is used, tie the other to VCC to force Y = A (buffer mode) or to GND to force Y = LOW (disable mode).

Does 74AHCT1G08SE-7 support hot-swap or live-insertion?

No. The device lacks Ioff protection or power-off isolation. Applying input signals while VCC is unpowered may forward-bias internal ESD diodes, causing excessive current flow and potential damage. Always ensure VCC is stable before applying logic signals, especially in modular backplane or card-edge applications.

How does the Schmitt-trigger input affect timing analysis?

Schmitt-trigger inputs introduce hysteresis (~0.3 V), meaning rising and falling thresholds differ (e.g., ~1.5 V and ~1.2 V). This delays effective switching relative to non-hysteresis gates but improves noise margin. Timing parameters (tpd) in the datasheet already account for this behavior under specified test conditions (VM = 1.5 V, tr/tf ≤ 3 ns), so no derating is needed for standard use.