Nexperia USA Inc. 74LVCH8T245BQ,118

Overview

74LVCH8T245BQ,118 from Nexperia is an 8-bit dual-supply translating transceiver with 3-state outputs, enabling bidirectional level translation between independent voltage domains (1.2 V to 5.5 V). It features separate VCC(A) and VCC(B) supplies, DIR-controlled data direction, active-low OE for bus isolation, IOFF-enabled partial power-down, and active bus hold on all I/O pins. It is used in mixed-voltage system interconnects such as FPGA-to-ASIC communication, microcontroller peripheral bridging, and industrial I/O expansion.

For engineers reviewing the 74LVCH8T245BQ,118 datasheet, 74LVCH8T245BQ pinout, 74LVCH8T245BQ application, or 74LVCH8T245BQ equivalent, key selection criteria include dual-rail voltage flexibility (1.2–5.5 V per rail), guaranteed 420 Mbps max data rate (3.3 V → 5.0 V), ±24 mA output drive at 3.0 V, IOFF leakage < ±2 μA in suspend mode, and -40 °C to +125 °C operation in DHVQFN24 package.

Technical Context

This device implements a dual-supply CMOS transceiver architecture with independent A- and B-side I/O banks referenced to VCC(A) and VCC(B), respectively. Direction control is implemented via a single DIR input that selects An→Bn (DIR = HIGH) or Bn→An (DIR = LOW), while OE (active LOW) places both ports in high-impedance state.

The IOFF circuit ensures sub-2 μA off-state leakage when either supply is at GND, enabling safe hot-insertion and partial power-down. Bus hold circuitry actively maintains unused inputs at valid logic levels without external pull resistors, reducing board-level component count and improving noise immunity in floating-bus scenarios.

Key Specifications

Pinout & Package

DHVQFN24 package (SOT815-1): 3.5 mm × 5.5 mm × 0.85 mm body, 24-terminal leadless thermal-enhanced quad flat no-lead, exposed thermal pad (not electrically connected).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-supply translating transceiver applications.

Compared with SN74AVCH8T245RHLR and TXS0108EPRJR, the 74LVCH8T245BQ,118 offers broader voltage support (up to 5.5 V), higher drive capability (±24 mA), and faster propagation (5.4 ns), making it optimal for mixed-voltage, high-speed, and industrial-grade designs requiring robustness and flexibility.

Availability

74LVCH8T245BQ,118 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, FPGA-to-peripheral bridging, and server baseboard management requiring stable component supply across extended temperature and voltage ranges.

Supply support for 74LVCH8T245BQ,118 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, reliable, and energy-efficient components for automotive, industrial, computing, and consumer applications.

The 74LVCH8T245BQ,118 belongs to Nexperia's LVC/LVCH logic family, designed specifically for robust bidirectional level translation in mixed-voltage embedded systems demanding wide supply range, low power, and industrial temperature operation.

FAQ

What is the maximum allowable voltage difference between VCC(A) and VCC(B)?

The datasheet permits any combination within 1.2 V to 5.5 V per rail, meaning ΔVCC can reach up to 4.3 V (e.g., VCC(A) = 1.2 V, VCC(B) = 5.5 V). No derating is required, and IOFF protection remains fully functional across this full differential range.

Can the 74LVCH8T245BQ,118 operate with VCC(A) = 1.2 V and VCC(B) = 1.5 V while maintaining 420 Mbps data rate?

No - the 420 Mbps rating applies only to 3.3 V → 5.0 V translation. At 1.2 V ↔ 1.5 V, the maximum data rate is 60 Mbps per the datasheet's "Maximum data rates" table, due to reduced drive strength and increased propagation delay at lower voltages.

Is the exposed thermal pad on the DHVQFN24 package electrically connected?

No - the thermal pad (pin 1 index area) has no electrical function. Nexperia specifies it may remain floating or be connected to GND, but soldering is optional and does not affect electrical performance or thermal dissipation significantly.

How does bus hold functionality interact with externally pulled I/O lines?

Bus hold current (±19 μA min at 1.2 V) is intentionally weak - external pull resistors ≥10 kΩ will override it. Bus hold activates only when external bias is absent, ensuring compatibility with existing pull-up/down designs while eliminating them where unnecessary.