STMicroelectronics 74LCX07TTR

Overview

74LCX07TTR from STMicroelectronics is a low-voltage CMOS hex buffer with open-drain outputs, 5 V tolerant inputs, 2.0–3.6 V operating supply, 5.2 ns max propagation delay at 3 V, and ±24 mA output drive capability. It serves as a level-shifting interface buffer in mixed-voltage digital systems, enabling 3.3 V logic to drive 5 V bus loads in PCI-compliant applications.

For engineers reviewing the 74LCX07TTR datasheet, 74LCX07TTR pinout, 74LCX07TTR application, or 74LCX07TTR equivalent, key selection criteria include open-drain output configuration, 5 V input tolerance, symmetrical 24 mA drive strength, latch-up immunity (>500 mA), and TSSOP14 package compatibility with space-constrained PCB layouts.

Technical Context

The 74LCX07TTR implements six independent non-inverting open-drain buffers using sub-micron C2MOS technology. Each channel accepts inputs up to 5.5 V while operating from a 2.0–3.6 V supply, enabling seamless interfacing between 3.3 V logic domains and legacy 5 V buses without external level shifters.

Its internal structure includes two-stage buffering for high noise immunity and stable output transitions. Power-down protection ensures safe I/O behavior during V_CC ramp-up/down, and ESD robustness (HBM: 2000 V, MM: 200 V, CDM: 1000 V) supports handling in industrial assembly environments.

Key Specifications

Pinout & Package

TSSOP14 (Thin Shrink Small Outline Package, 14-pin) - 4.9 mm × 6.4 mm body, 0.65 mm pitch, 1.2 mm height, lead-free and RoHS-compliant per ECOPACK® specifications.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar hex open-drain buffer applications.

Compared with SN74LVC07APWR and 74AHC07PW, the 74LCX07TTR uniquely delivers guaranteed 5 V input tolerance *with* 24 mA drive and 5.2 ns delay at 3.3 V - making it the only choice for PCI-compliant 3.3 V-to-5 V bus interfacing where both speed and robustness are required.

Availability

74LCX07TTR is available at Aetrix Electronics and suitable for PCI bus interface, industrial control backplane, automotive body control module, and 3.3 V to 5 V level translation applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for 74LCX07TTR 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.

The 74LCX series targets low-voltage, high-speed logic interfacing in mixed-supply systems, emphasizing 5 V tolerance, PCI compliance, and power efficiency in 3.3 V domains.

FAQ

Can 74LCX07TTR be used with a 5 V supply?

No - the 74LCX07TTR is rated for V_CC = 2.0–3.6 V only. Supplying 5 V to V_CC exceeds absolute maximum ratings and will cause permanent damage. Its 5 V tolerance applies solely to input pins, not the power rail.

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

A 1–4.7 kΩ resistor to 5 V is typical. At 24 mA sink current and 0.55 V max VOL, a 4.7 kΩ pull-up yields ~1 mA quiescent current and meets PCI VOL spec; lower values improve rise time but increase power consumption.

Does 74LCX07TTR support hot-plug operation?

Yes - its power-down protection prevents back-current flow when V_CC is unpowered, and inputs remain high-impedance with no leakage path. This allows safe insertion into live backplanes, provided GND and signal lines connect before V_CC.

Is the TSSOP14 package compatible with SO-14 footprints?

No - TSSOP14 has 0.65 mm pitch and 4.9 × 6.4 mm body; SO-14 uses 1.27 mm pitch and 8.65 × 3.9 mm body. They are mechanically incompatible and require separate PCB land patterns.