Diodes Incorporated 74AHC1G09SE-7

Overview

74AHC1G09SE-7 from Diodes Incorporated is a single 2-input positive AND gate with open-drain output, designed for level-shifted wired-AND/wired-OR logic in mixed-voltage systems. It operates from 2.0V to 5.5V, delivers 8mA sink current at 5.0V, features Schmitt-trigger inputs for noise immunity, and is packaged in RoHS-compliant SOT353.

For engineers reviewing the 74AHC1G09SE-7 datasheet, 74AHC1G09SE-7 pinout, 74AHC1G09SE-7 application, or 74AHC1G09SE-7 equivalent, key selection criteria include open-drain drive capability, input hysteresis, supply voltage flexibility, and compatibility with 1.8V/3.3V/5V interface domains.

Technical Context

This device implements standard Boolean Y = A · B logic but requires an external pull-up resistor to assert high output states. Its open-drain architecture enables bidirectional bus sharing and voltage-level translation across domains without level-shifter ICs.

Schmitt-trigger inputs provide ≥0.8V hysteresis at VCC = 3.3V, ensuring robust operation with slow-rising signals (e.g., RC-filtered microcontroller GPIO). ESD protection exceeds 2000V HBM and latch-up immunity exceeds 100mA per JESD78 Class II.

Key Specifications

Pinout & Package

74AHC1G09SE-7 is housed in a 5-pin SOT353 package (1.2mm × 2.1mm × 0.95mm), optimized for space-constrained PCB layouts and automated placement.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC1G09DBVR and 74AUP1G09GW,125, the 74AHC1G09SE-7 uniquely balances 5V tolerance, Schmitt-trigger noise immunity, and 8mA drive-making it optimal for industrial I/O and mixed-voltage USB detection where reliability trumps raw speed.

Availability

74AHC1G09SE-7 is available at Aetrix Electronics and suitable for industrial control I/O expansion, USB device enumeration logic, low-power sensor wake-up logic, and legacy parallel port handshaking requiring stable component supply and long-term lifecycle support.

Supply support for 74AHC1G09SE-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, energy-efficient components for industrial, computing, and consumer markets.

The 74AHC logic family targets cost-sensitive, space-constrained applications requiring rail-to-rail voltage compatibility, low static power, and robust noise immunity-particularly in interface bridging and signal conditioning roles.

FAQ

What pull-up resistor value is recommended for the open-drain output?

A 4.7kΩ resistor to VCC is typical for 5V operation, yielding ~1mA quiescent current and <10ns rise time into 15pF load. For 3.3V systems, 2.2kΩ provides similar timing while maintaining >2mA sink margin. Values below 1kΩ increase power consumption unnecessarily; above 10kΩ degrade rise time in noisy environments.

Can multiple 74AHC1G09SE-7 outputs be tied together?

Yes-its open-drain output allows direct wire-AND connection with other open-drain devices. Ensure all shared outputs use identical pull-up voltage and that total sink current does not exceed 8mA per device. Avoid mixing with push-pull outputs, which may cause contention and excessive current draw.

Does this device support 1.8V input logic levels?

No-minimum high-level input voltage (VIH) is 1.5V at VCC = 2.0V, making it incompatible with 1.8V logic thresholds. For true 1.8V-compatible AND gates, consider the 74AUP1G09, which specifies VIH = 0.63V at VCC = 1.8V and supports down to 0.8V VCC.

Is thermal derating required for continuous 8mA sink operation?

At TA = 85°C, θJA = 371°C/W for SOT353 yields ~2.2°C temperature rise at 8mA sink (P = 0.04W), well within the −40°C to +125°C junction limit. No derating is needed up to 125°C ambient if board copper area meets Diodes' suggested pad layout (C1 = 1.9mm, C2 = 0.65mm).