onsemi 74LCX00MX

Overview

74LCX00MX from ON Semiconductor is a low-voltage quad 2-input NAND gate IC with 5V-tolerant inputs, designed for level-shifting between 3.3V and 5V logic domains. It operates from 2.3V to 3.6V V_CC, delivers ≤5.2ns propagation delay at 3.3V, supports ±24mA output drive, and features power-down high-impedance I/O for bus-hold compatibility in mixed-voltage systems.

For engineers reviewing the 74LCX00MX datasheet, pinout, applications, or equivalent options, this device is selected for voltage translation in FPGA I/O expansion, microcontroller peripheral interfacing, and legacy 5V-to-modern 3.3V system bridging where input overvoltage resilience and low static current (≤10µA) are critical.

Technical Context

The 74LCX00MX implements four independent NAND gates using advanced CMOS process technology optimized for speed-power trade-off at sub-3.6V supply. Its input structure incorporates protection circuitry enabling safe operation with DC input voltages up to 7V - exceeding standard 5V TTL levels - while maintaining rail-to-rail output swing referenced to V_CC.

All inputs and outputs enter high-impedance state during power-down (V_CC = 0V), preventing back-driving of powered subsystems. Propagation delay skew between outputs is limited to ≤1.0ns, ensuring timing coherence across all four gates under identical load conditions (CL = 50pF, RL = 500Ω).

Key Specifications

Pinout & Package

74LCX00MX is supplied in a 14-terminal DQFN (Depopulated Quad Very-Thin Flat Pack No Leads) package, JEDEC MO-241 compliant, measuring 2.5 × 3.0 mm with 0.5 mm pitch. The exposed die attach pad (DAP) is electrically unconnected and intended for thermal enhancement only.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar NAND gate logic applications.

Compared with SN74LVC00APWR and 74ALVC00MTCX, the 74LCX00MX uniquely provides 7V input tolerance at 3.3V operation - making it the only option among the three qualified for direct 5V-to-3.3V level translation without external components, while maintaining low ICC and DQFN footprint.

Availability

74LCX00MX is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, FPGA configuration interfaces, and USB-to-parallel bridge designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant leadless packaging.

Supply support for 74LCX00MX 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

ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power management, analog, logic, and sensor solutions for automotive, industrial, and cloud infrastructure markets.

The 74LCX00MX belongs to the LCX family of low-voltage, high-speed CMOS logic devices engineered for mixed-voltage system interoperability - specifically targeting seamless 5V-to-3.3V signal translation in space-constrained, thermally sensitive applications.

FAQ

What is the maximum input voltage rating for 74LCX00MX?

The 74LCX00MX supports DC input voltages up to 7.0V regardless of V_CC level - a key differentiator enabling direct connection to 5V buses without external protection. This specification is validated per Absolute Maximum Ratings table in the Fairchild/ON Semiconductor datasheet Rev. 1.7.1, and applies to all input pins (An, Bn) under continuous operation.

Does 74LCX00MX support power-down mode with high-impedance I/O?

Yes, the 74LCX00MX enters a true high-impedance state on all inputs and outputs when V_CC = 0V, as confirmed in the General Description and Pin Description sections. This behavior prevents back-driving of powered subsystems and is critical for hot-swap and partial-power-down architectures - distinct from standard 74HC/LVC families that may leak current during power loss.

What package type is used for 74LCX00MX and is it RoHS-compliant?

The 74LCX00MX is packaged in a 14-terminal DQFN (JEDEC MO-241, 2.5 × 3.0 mm) with leadless terminations. Per Ordering Information section, all packages - including the DQFN variant - are lead-free and compliant with JEDEC J-STD-020B reflow standards. The DAP (Die Attach Pad) is electrically unconnected but recommended for thermal grounding.

Can 74LCX00MX replace 74LCX00M or 74LCX00SJ in existing designs?

The 74LCX00MX shares identical logic functionality, AC/DC electrical characteristics, and pinout with 74LCX00M (SOIC) and 74LCX00SJ (SOP), but differs in package - DQFN vs. SOIC/SOP. PCB redesign is required due to footprint and soldering profile differences; however, schematic connectivity and timing behavior remain fully interchangeable per datasheet Rev. 1.7.1 Section "Ordering Information".

What is the typical propagation delay of 74LCX00MX at 3.3V supply?

The 74LCX00MX exhibits a maximum propagation delay (t_PHL/t_PLH) of 5.2ns at V_CC = 3.3V ± 0.3V, CL = 50pF, and TA = –40°C to +85°C, as specified in the AC Electrical Characteristics table. Typical delay is lower (1.5ns), but design validation must use the 5.2ns worst-case value for timing closure in synchronous systems.