onsemi MC74VHC08MELG

Overview

MC74VHC08MELG from onsemi is a high-speed CMOS quad 2-input AND gate in SOIC-14 package, operating from 2.0 V to 5.5 V, with 4.3 ns typical propagation delay at 5.0 V and full 5.0 V CMOS-level output swing. It features TTL-compatible input thresholds only in the VHCT variant; this MC74VHC08MELG uses standard CMOS input levels and supports 3.3 V/5.0 V level translation in mixed-voltage logic interfaces.

For engineers reviewing the MC74VHC08MELG datasheet, pinout, applications, or equivalent options, key selection criteria include its 2.0–5.5 V supply range, 4.3 ns (typ) tPLH/tPHL at 5 V/50 pF, CMOS-input compatibility, ±25 mA output drive, and SOIC-14 footprint for legacy board compatibility and signal integrity in digital control and interface circuits.

Technical Context

The MC74VHC08MELG implements four independent AND gates using silicon-gate CMOS technology, with three-stage internal circuitry including a buffered output stage that ensures high noise immunity (VNIH/VNIL = 28%) and stable switching. Its inputs tolerate up to 5.5 V regardless of VCC, enabling safe interfacing between 3 V and 5 V systems.

It delivers rail-to-rail CMOS output swings (VOH ≥ 4.4 V, VOL ≤ 0.1 V at 4.5 V/4 mA), low dynamic noise (VOLP ≤ 0.8 V), and latchup immunity exceeding 100 mA. The device lacks tristate capability and does not support power-off protection - a feature reserved for the MC74VHCT08A variant.

Key Specifications

Pinout & Package

MC74VHC08MELG is housed in a 14-pin SOIC (Small Outline Integrated Circuit) package per case 751A, with standard 1.27 mm pitch, 8.75 mm body width, and 3.9 mm body height. Pin 1 is marked by a beveled corner or dot; the package is Pb-free and RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC08APWR and MC74VHCT08ADTR2G, the MC74VHC08MELG uniquely supports 2.0–5.5 V operation with CMOS-input compatibility, making it the only option among the three capable of bidirectional 3.3 V ↔ 5.0 V level translation without external components.

Availability

MC74VHC08MELG is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, and medical infusion pump logic requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MC74VHC08MELG 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 management, analog, logic, and sensing solutions for automotive, industrial, and cloud infrastructure markets.

The MC74VHC08MELG belongs to the VHC (Very High Speed CMOS) logic family, designed to replace bipolar TTL in cost-sensitive, low-power, and wide-supply applications while maintaining pin compatibility and predictable timing behavior.

FAQ

What logic family does MC74VHC08MELG belong to, and how does it differ from 74HC?

The MC74VHC08MELG belongs to the VHC (Very High Speed CMOS) family. It differs from standard 74HC by offering faster propagation delay (4.3 ns vs. ~7 ns at 5 V), lower input capacitance (10 pF), and enhanced input overvoltage tolerance (−0.5 V to +6.5 V). Unlike 74HC, VHC devices use silicon-gate CMOS process for improved speed-power trade-offs and wider supply range (2.0–5.5 V).

Can MC74VHC08MELG interface directly between a 3.3 V microcontroller and a 5 V peripheral?

Yes, MC74VHC08MELG can serve as a level translator: its inputs tolerate up to 5.5 V regardless of VCC, so 5 V peripheral outputs may safely drive its inputs even when VCC = 3.3 V; its outputs swing rail-to-rail, delivering full 3.3 V logic highs to the peripheral if powered at 3.3 V, or full 5 V highs if powered at 5 V. No external resistors or translators are needed.

Is MC74VHC08MELG pin-compatible with other quad 2-input AND gates like 74LS08 or 74HC08?

Yes, MC74VHC08MELG is pin- and function-compatible with 74LS08, 74HC08, and 74AHC08 in SOIC-14 packages. Pin assignments (1–14) match the industry-standard layout: inputs A1/B1–A4/B4 occupy pins 1,2,4,5,9,10,12,13; outputs Y1–Y4 are on pins 3,6,8,11; GND is pin 7; VCC is pin 14. This enables drop-in replacement in existing designs.

Does MC74VHC08MELG support tristate or open-drain outputs?

No, MC74VHC08MELG does not support tristate or open-drain outputs. All four AND gates feature standard CMOS push-pull outputs with active high and low states only. Outputs are not designed to be wire-ORed or shared on a common bus. For bus-oriented designs, consider dedicated tristate logic families such as 74LVCH or 74ALVC series.

What is the maximum capacitive load MC74VHC08MELG can drive reliably at 5 V supply?

MC74VHC08MELG is characterized up to 50 pF load capacitance in AC specifications, with 4.3 ns typical propagation delay at VCC = 5.0 V and CL = 50 pF. Driving heavier loads increases delay nonlinearly and may cause ringing or reduced noise margin. For >50 pF, add series termination or buffer stages; the device's ±8 mA output drive limits practical fan-out to ~10 standard CMOS inputs (CIN ≈ 5 pF each) at 5 V.