onsemi 74LVTH162245MTX

Overview

74LVTH162245MTX from onsemi (formerly Fairchild) is a low-voltage 16-bit bidirectional transceiver with 3-STATE outputs, bushold inputs on all data pins, and integrated 25 Ω series termination on A-port outputs. It operates at 2.7–3.6 V, supports 5 V-tolerant I/O, and delivers ±12 mA drive on A port and ±32/±64 mA on B port - designed for memory address, clock, and bus interface applications in mixed-voltage systems.

For engineers reviewing the 74LVTH162245MTX datasheet, pinout, applications, or equivalent options, this device requires attention to byte-level direction control (T/R1/T/R2), dual OE inputs, bushold behavior on unused inputs, and differential drive capability between A and B ports in high-speed 3.3 V bus environments.

Technical Context

The 74LVTH162245MTX implements two independent 8-bit transceiver sections (A0–A7/B0–B7 and A8–A15/B8–B15), each with dedicated T/R and OE controls. Its bushold circuitry maintains valid logic states on floating inputs without external pull-ups, reducing BOM count and layout complexity.

A-port outputs integrate 25 Ω series resistance in both HIGH and LOW states, suppressing transmission-line overshoot/undershoot and eliminating need for discrete termination resistors. B-port outputs provide higher drive strength (32 mA sink / 64 mA sink) for driving heavier loads or longer traces.

Key Specifications

Pinout & Package

74LVTH162245MTX is packaged in a 48-lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1 mm wide, with exposed pad not electrically connected. Pin pitch is 0.5 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC16245ADGGR and 74ALVCH162245GR, the 74LVTH162245MTX uniquely combines bushold, 5 V-tolerant I/O, and A-port 25 Ω series termination - reducing component count and improving signal fidelity in mixed-voltage industrial bus designs without sacrificing controllability.

Availability

74LVTH162245MTX is available at Aetrix Electronics and suitable for memory interface, industrial backplane, clock distribution, and legacy bus bridging applications requiring stable component supply and long-term industrial lifecycle support.

Supply support for 74LVTH162245MTX 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 Fairchild Semiconductor) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The 74LVTH162245MTX belongs to onsemi's legacy LVT/LVTH logic family - engineered for reliable 3.3 V/5 V mixed-signal interfacing in industrial and telecom infrastructure where robustness, ESD immunity, and bus noise suppression are critical.

FAQ

What is the function of the bushold feature in the 74LVTH162245MTX?

The bushold feature in the 74LVTH162245MTX actively maintains the last-valid logic state on any unused A0–A15 or B0–B15 input pin, eliminating the need for external pull-up or pull-down resistors. This reduces bill-of-materials count and PCB area while preventing undefined states during power-up, reset, or partial bus usage - a key advantage in space-constrained industrial control modules where the 74LVTH162245MTX is commonly deployed.

Can the 74LVTH162245MTX be used to interface a 3.3 V FPGA with a 5 V ADC?

Yes, the 74LVTH162245MTX supports 5 V-tolerant inputs and outputs, allowing direct connection between a 3.3 V FPGA and a 5 V ADC without level-shifting circuitry. Its A-port 25 Ω series resistance helps dampen signal reflections on the ADC data bus, and bushold prevents floating inputs if some ADC channels remain unconnected - making the 74LVTH162245MTX well-suited for mixed-voltage data acquisition subsystems.

What does "MTX" signify in the part number 74LVTH162245MTX?

The "MTX" suffix in 74LVTH162245MTX indicates tape-and-reel packaging in the 48-lead TSSOP (MTD48) format - specifically optimized for automated SMT assembly. This differs from "MTD", which denotes tube packaging. Both share identical electrical specifications and pinout, but the 74LVTH162245MTX is supplied in reels compatible with high-volume pick-and-place equipment used in industrial electronics manufacturing.

Is the 74LVTH162245MTX still recommended for new designs?

No - the 74LVTH162245MTX is marked "DISCONTINUED" and "NOT RECOMMENDED FOR NEW DESIGN" by onsemi. While Aetrix Electronics maintains legacy inventory and supports existing production, engineers designing new systems should consult onsemi's current-generation alternatives such as the 74LVC16245A series or ALVC variants, which offer improved speed, lower power, and active lifecycle support - though they lack the integrated A-port termination and bushold of the 74LVTH162245MTX.

How does the 25 Ω series resistance on the A port of the 74LVTH162245MTX improve signal integrity?

The 25 Ω series resistance on the A port of the 74LVTH162245MTX acts as source termination matched to typical PCB trace impedance (50–75 Ω), reducing signal overshoot, undershoot, and ringing - especially on unterminated stubs or medium-length traces. This eliminates the need for discrete 25–33 Ω resistors per line, simplifying layout and improving timing margins in memory address or control bus applications where the 74LVTH162245MTX is frequently applied.