onsemi MC74AC08D

Overview

MC74AC08D from onsemi is a quad 2-input AND gate in high-performance silicon-gate CMOS technology, operating at supply voltages from 2.0 V to 6.0 V, delivering ±24 mA output drive, with propagation delays as low as 5.5 ns at 5.0 V and 50 pF load, used in digital logic interfacing and signal conditioning within industrial control and instrumentation systems.

For engineers reviewing the MC74AC08D datasheet, pinout, applications, or equivalent options, this page provides verified functional identity, SOIC-14 package mapping, confirmed DC/AC electrical parameters, thermal and ESD ratings, and two validated alternative parts for logic-level compatibility and supply voltage range matching.

Technical Context

The MC74AC08D implements four independent 2-input AND gates using CMOS circuitry with rail-to-rail input voltage tolerance (−0.5 V to VCC + 0.5 V) and guaranteed noise margins across its full operating temperature range of −40°C to +85°C. Its input thresholds scale with VCC - VIH = 2.1 V min at 3.0 V, 3.15 V at 4.5 V, and 3.85 V at 5.5 V - ensuring robust logic discrimination.

It supports dynamic output currents up to ±75 mA for short-duration pulses (≤2.0 ms), while maintaining static output drive of ±24 mA under continuous DC conditions. Input capacitance is 4.5 pF and power dissipation capacitance is 20 pF at 5.0 V, enabling predictable timing behavior in high-speed combinatorial logic paths.

Key Specifications

Pinout & Package

MC74AC08D is packaged in a 14-lead SOIC (Small Outline Integrated Circuit) with case outline 751A, body dimensions 8.55–8.75 mm × 3.80–4.00 mm, 1.27 mm pitch, and Pb-free finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC74AC08D, SN74AC08DR offers identical logic timing and drive strength without automotive qualification, while 74VHC08M trades 6 V tolerance and ±24 mA drive for sub-microamp quiescent current - making MC74AC08D optimal for mixed-voltage industrial systems needing robustness and flexibility.

Availability

MC74AC08D is available at Aetrix Electronics and suitable for industrial automation, test equipment, and embedded control systems requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for MC74AC08D 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power and signal management solutions for automotive, industrial, cloud, and IoT applications.

The MC74AC08D belongs to the 74AC logic family, designed for high-speed, low-power, mixed-voltage digital interfacing in industrial and instrumentation systems where reliability and wide supply range are essential.

FAQ

What is the maximum supply voltage rating for MC74AC08D?

The MC74AC08D has an absolute maximum DC supply voltage (VCC) rating of +6.5 V, with recommended operation from 2.0 V to 6.0 V. Operation above 6.0 V is permissible only for brief transient conditions and must remain below 6.5 V to avoid permanent damage. The MC74AC08D maintains full logic functionality and output drive capability across this entire range.

Does MC74AC08D support 3.3 V logic systems?

Yes, MC74AC08D fully supports 3.3 V operation: it guarantees VIH ≥ 2.1 V and VIL ≤ 0.9 V at VCC = 3.0 V, delivering >1.2 V noise margin. Propagation delay is 9.5 ns max at 3.3 V/50 pF, and output drive remains ±24 mA - making MC74AC08D compatible with standard 3.3 V CMOS and LVTTL interfaces.

Is MC74AC08D pin-compatible with MC74ACT08D?

Yes, MC74AC08D and MC74ACT08D share identical pinouts and SOIC-14/TSSOP-14 packages, but differ in input threshold compatibility: MC74ACT08D has TTL-compatible inputs (VIH = 2.0 V min at 4.5 V), whereas MC74AC08D uses CMOS thresholds (VIH = 3.15 V min at 4.5 V). The MC74AC08D cannot directly replace MC74ACT08D in TTL-driven systems without level translation.

What is the thermal resistance of MC74AC08D in SOIC-14 package?

The MC74AC08D in SOIC-14 package (suffix D) has a junction-to-ambient thermal resistance (θJA) of 116 °C/W, measured per JESD51-7. This value enables the device to dissipate up to 1077 mW in still air at 25°C ambient, supporting continuous ±24 mA output loading without exceeding the 150°C maximum junction temperature limit.

Does MC74AC08D require external pull-up or pull-down resistors on unused inputs?

Yes, unused inputs on MC74AC08D must be terminated to VCC or GND - floating CMOS inputs cause increased ICC, unpredictable logic states, and potential oscillation. Each unused input draws up to ±1.0 µA leakage, but uncontrolled bias risks shoot-through current and EMI. For robust design, tie all unused MC74AC08D inputs directly to VCC or GND using short traces.