onsemi 74LCXH245MTCX

Overview

74LCXH245MTCX from ON Semiconductor is a low-voltage bidirectional transceiver with bushold functionality, designed for 2.3V–3.6V bus interfacing between mixed-voltage domains. It features 8-bit bidirectional data flow controlled by T/R and OE inputs, ±24 mA output drive at 3.0V, 7.0 ns max propagation delay (VCC = 3.3V), and 5V-tolerant control inputs - enabling safe interface with legacy 5V logic in modern low-voltage systems such as embedded controllers and memory expansion buses.

For engineers reviewing the 74LCXH245MTCX datasheet, pinout, applications, or equivalent options, key selection criteria include bushold-enabled input stability without external resistors, 20-pin TSSOP package compatibility with high-density PCB layouts, 3-STATE output isolation timing (tPZL/tPLZ ≤ 10.5 ns), and compliance with JEDEC MO-153 mechanical standards for automated assembly.

Technical Context

The 74LCXH245MTCX implements non-inverting bidirectional buffering with independent 3-STATE control per port via OE and direction control via T/R. Its bushold circuitry actively maintains valid logic levels on A0–A7 and B0–B7 inputs during floating or unused states, eliminating external pull-up/pull-down components.

It operates across 2.3V–3.6V VCC with guaranteed AC performance down to −40°C and up to +85°C, supports 5V-tolerant OE/T/R inputs, and delivers rail-to-rail output swing with VOH ≥ VCC − 0.2V and VOL ≤ 0.55V at 24 mA sink current - critical for noise-immune signal integrity in multi-drop bus environments.

Key Specifications

Pinout & Package

74LCXH245MTCX is housed in a 20-lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153 compliant, 4.4 mm wide, with 0.65 mm lead pitch - optimized for fine-pitch automated placement and reflow soldering in space-constrained applications.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bidirectional transceiver applications.

Compared with 74LCXH245MTCX, the 74LVC245APW,118 offers faster speed but increases component count and layout risk, while the SN74AVC245DGVR extends voltage range downward but removes bushold - making 74LCXH245MTCX uniquely suited for robust, resistor-free 2.5V/3.3V bus bridging.

Availability

74LCXH245MTCX is available at Aetrix Electronics and suitable for industrial PLC backplanes, FPGA I/O expansion, automotive infotainment memory buses, and medical instrumentation data acquisition requiring stable component supply and long-term manufacturability.

Supply support for 74LCXH245MTCX 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 74LCXH245MTCX belongs to the LCX family of low-voltage logic devices engineered for mixed-signal interfacing in space- and power-constrained systems - emphasizing bushold reliability, 5V-tolerant control, and JEDEC-standard packaging.

FAQ

What is the maximum operating temperature range for the 74LCXH245MTCX?

The 74LCXH245MTCX is rated for free-air operating temperatures from −40°C to +85°C, validated across all electrical parameters including propagation delay, output drive, and bushold hold current. This range supports deployment in industrial control cabinets and automotive under-dash environments where ambient thermal cycling occurs.

Does the 74LCXH245MTCX require external pull-up resistors on its I/O pins?

No, the 74LCXH245MTCX does not require external pull-up or pull-down resistors thanks to integrated bushold circuitry on all A0–A7 and B0–B7 inputs. This feature actively maintains valid logic levels during floating or unused states, reducing BOM count and improving reliability in hot-swap or partial-power-down conditions.

Can the 74LCXH245MTCX interface safely between a 5V microcontroller and a 3.3V peripheral?

Yes - the 74LCXH245MTCX accepts 0–5.5V input voltages on OE and T/R control pins while operating from a 2.3V–3.6V VCC supply, enabling direct connection to 5V GPIOs. Its I/O pins are not 5V-tolerant, so A/B-side connections must remain within VCC + 0.5V (≤4.1V), making it ideal for 3.3V↔2.5V translation, not 5V↔3.3V data paths.

What is the significance of the "X" suffix in 74LCXH245MTCX?

The "X" suffix in 74LCXH245MTCX indicates tape-and-reel packaging per ON Semiconductor's ordering convention. This format supports automated SMT placement and is standard for production volumes. The device itself is functionally identical to the tray-packaged 74LCXH245MTC, with no electrical or thermal differences.

How does the bushold feature affect power consumption in the 74LCXH245MTCX?

The bushold circuitry in the 74LCXH245MTCX draws only ±75 µA minimum hold current at VCC = 3.0V - contributing negligibly to total ICC (10 µA quiescent). Unlike external resistors that continuously dissipate power, bushold activates only when inputs float, delivering zero static power penalty while ensuring deterministic logic levels.