onsemi 74LCX06M

Overview

74LCX06M from onsemi is a low-voltage hex inverter/buffer with open-drain outputs, designed for level-shifting between 5 V and 3 V systems. It features 5 V-tolerant inputs, 3.7 ns max propagation delay at 3.3 V, ±24 mA output drive capability, and operates across 1.65–5.5 V supply range - used in I²C bus buffering and mixed-voltage logic interfacing.

For engineers reviewing the 74LCX06M datasheet, pinout, applications, or equivalent options, key selection criteria include open-drain compatibility, 5 V input tolerance, thermal performance (150 °C/W θ_JA), and Pb-free TSSOP-14 packaging for high-density PCB layouts.

Technical Context

The 74LCX06M implements six independent inverting buffers with open-drain outputs, enabling wired-AND logic and I²C-compatible bus driving. Its CMOS process delivers high-speed operation while maintaining low ICC (≤10 µA) and supports power-down mode with high-impedance I/Os when V_CC = 0 V.

Input voltage tolerance up to 5.5 V allows direct connection to legacy 5 V logic without external level shifters. Propagation delay varies with V_CC: 3.7 ns max at 3.0–3.6 V, 3.2 ns max at 4.5–5.5 V, and 6.5 ns max at 1.65–1.95 V - confirming its use in multi-rail voltage domains.

Key Specifications

Pinout & Package

TSSOP-14 wide-body package (Case 948G), 5.0 mm × 4.4 mm footprint, 0.65 mm pitch, Pb-free and RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar hex inverter applications.

Compared with SN74LVC06APW and 74AHC06PW, the 74LCX06M uniquely combines 5 V input tolerance with open-drain outputs - making it irreplaceable for mixed-voltage I²C expansion and hot-swap-safe signal routing where bus arbitration and level translation are both required.

Availability

74LCX06M is available at Aetrix Electronics and suitable for I²C bus extension, mixed-voltage logic interfacing, and hot-swappable module design requiring stable component supply across automotive, industrial, and embedded computing programs.

Supply support for 74LCX06M 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 is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The 74LCX06M belongs to the LCX low-voltage logic family, engineered for interoperability between 3.3 V and 5 V systems while minimizing power consumption and EMI in space-constrained designs.

FAQ

What is the maximum operating temperature range for the 74LCX06M?

The 74LCX06M is rated for operation from −40 °C to +125 °C ambient temperature. This extended range supports deployment in under-hood automotive modules, industrial PLCs, and outdoor sensor nodes where thermal stress exceeds commercial-grade limits. The device maintains full DC and AC specifications across this range when operated within recommended V_CC and load conditions.

Can the 74LCX06M be used as a level shifter between 5 V and 3.3 V logic?

Yes, the 74LCX06M supports 5 V-tolerant inputs while operating from a 3.3 V supply, making it suitable as a unidirectional level shifter for 5 V → 3.3 V signal translation. Its open-drain outputs require an external pull-up to the destination rail (e.g., 3.3 V), and propagation delay remains ≤3.7 ns - preserving timing integrity in high-speed control interfaces.

Does the 74LCX06M support I²C bus operation?

Yes, the 74LCX06M is commonly used for I²C bus buffering and extension due to its open-drain outputs, 5 V-tolerant inputs, and guaranteed VOL ≤0.4 V at 3.0 V supply with 24 mA sink current. It complies with I²C standard-mode (100 kHz) and fast-mode (400 kHz) voltage thresholds when paired with appropriate pull-up resistors.

What is the thermal resistance (θ_JA) of the 74LCX06M in its TSSOP-14 package?

The 74LCX06M has a junction-to-ambient thermal resistance (θ_JA) of 150 °C/W when mounted on a standard FR4 PCB with minimum pad spacing and no airflow. This value assumes 2-ounce copper traces per JESD51-7; actual thermal performance improves with enhanced copper pour or thermal vias beneath the exposed pad (if present).

Is the 74LCX06M pin-compatible with other hex inverters like the 74HC06?

No, the 74LCX06M is not pin-compatible with 74HC06. While both are hex inverters in 14-pin packages, the 74HC06 uses SOIC-14 (wide-body) with different pin spacing and thermal pad layout. The 74LCX06M uses TSSOP-14 (Case 948G) with 0.65 mm pitch and tighter footprint - requiring dedicated PCB layout. Electrical differences (open-drain vs. push-pull) also preclude direct substitution.