Nexperia USA Inc. 74LVCH245ABQ,115

Overview

74LVCH245ABQ,115 from Nexperia is an octal 3-state bus transceiver with bidirectional data flow controlled by DIR and output enable (OE) inputs, operating from 1.2 V to 3.6 V supply, featuring bus hold on all data inputs, IOFF partial power-down protection, and 5.5 V overvoltage-tolerant inputs for mixed-voltage interfacing in industrial control backplanes.

For engineers reviewing the 74LVCH245ABQ,115 datasheet, 74LVCH245ABQ,115 pinout, 74LVCH245ABQ,115 application, or 74LVCH245ABQ,115 equivalent, this device serves as a level-translating bidirectional data buffer in FPGA-to-ASIC interconnects, microcontroller peripheral expansion buses, and legacy 5 V–to–3.3 V system bridging where bus stability and power sequencing robustness are critical.

Technical Context

The 74LVCH245ABQ,115 implements dual 8-bit bidirectional data paths with independent direction (DIR) and 3-state enable (OE) logic. Its Schmitt-trigger inputs tolerate slow-rising signals, and bus hold circuitry maintains valid logic states on un-driven A-side data lines without external pull resistors.

IOFF functionality disables outputs and blocks backflow current when VCC = 0 V, enabling hot-insertion and safe partial power-down in multi-rail systems. Input voltage tolerance up to 5.5 V allows direct connection to 5 V TTL sources while powered from 1.2–3.6 V supplies.

Key Specifications

Pinout & Package

DHVQFN20 package (SOT764-1): 2.5 mm × 4.5 mm × 0.85 mm body, 20-terminal leadless quad flat no-lead (QFN) with exposed thermal pad; optimized for high-density PCB layouts and thermal performance in space-constrained applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74LVC245ABQ,115 and SN74LVC8T245RHLR, the 74LVCH245ABQ,115 uniquely combines bus hold, IOFF, and 5.5 V tolerance-enabling simplified, robust, and sequenced-power designs where other variants require supplemental circuitry.

Availability

74LVCH245ABQ,115 is available at Aetrix Electronics and suitable for industrial PLC backplanes, FPGA peripheral expansion buses, microcontroller memory-mapped I/O bridges, and automotive body control subsystems requiring stable component supply across extended temperature and mixed-voltage conditions.

Supply support for 74LVCH245ABQ,115 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

Nexperia is a global semiconductor expert delivering high-performance logic, analog, and MOSFET solutions with emphasis on reliability, efficiency, and miniaturization for industrial, automotive, and consumer applications.

The 74LVCH series targets robust, mixed-voltage digital interfacing-designed specifically for systems requiring bus stability, power sequencing resilience, and wide supply flexibility without external support components.

FAQ

Does the 74LVCH245ABQ,115 support true bidirectional operation without external control logic?

Yes. The DIR pin directly controls data direction: DIR = HIGH enables A→B flow; DIR = LOW enables B→A flow. OE independently places both ports in high-impedance state. No external latches or clocking are needed-operation is purely combinatorial and synchronous with input edges.

Can the bus hold feature be disabled or overridden?

No. Bus hold is permanently enabled on all A-side inputs (A0–A7) and cannot be disabled. It activates automatically when input voltage falls below VIH or rises above VIL thresholds. Control inputs (DIR, OE) lack bus hold and must be actively driven.

What is the thermal pad connection requirement for the DHVQFN20 package?

The exposed thermal pad (terminal 10, GND) must be soldered to a PCB copper pour tied to system ground. This is mandatory for thermal performance and electrical stability. Floating or unconnected pads cause excessive junction temperature rise and potential functional failure above 60 °C ambient.

How does IOFF behave when VCC is ramping during power-up?

IOFF activates immediately once VCC drops below ~0.8 V and remains active until VCC exceeds ~1.0 V. During ramp-up, outputs stay in high-impedance until VCC stabilizes within specification-preventing glitch-induced contention on shared buses during power sequencing.