Nexperia USA Inc. 74LVCH2T45GS,115

Overview

74LVCH2T45GS,115 from Nexperia is a dual-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 two 2-bit I/O ports (A and B), a direction control (DIR) input referenced to VCC(A), and separate supply pins VCC(A) and VCC(B). With ±24 mA drive at 3.0 V, IOFF partial power-down protection, and active bus hold on data inputs, it is used in mixed-voltage SoC interconnects, FPGA I/O bridging, and industrial sensor interface subsystems.

For engineers reviewing the 74LVCH2T45GS,115 datasheet, 74LVCH2T45GS,115 pinout, 74LVCH2T45GS,115 application, or 74LVCH2T45GS,115 equivalent, key selection criteria include dual-supply translation range (1.2–5.5 V per rail), suspend-mode high-impedance behavior during power loss, bus hold functionality for floating inputs, and guaranteed timing across -40 °C to +125 °C.

Technical Context

This device implements a bidirectional, direction-controlled data path where DIR determines signal flow: HIGH enables A→B translation, LOW enables B→A. Each port operates independently under its own supply, with inputs tolerant up to 5.5 V regardless of VCC level. The IOFF circuit disables outputs and blocks backflow current when either VCC(A) or VCC(B) is at GND, ensuring safe partial power-down operation.

Active bus hold circuitry maintains unused A/B port inputs at valid logic levels without external pull resistors. Propagation delays are voltage- and temperature-dependent - e.g., tPLH from A to B ranges from 0.7 ns (VCC(A)=5.0 V, VCC(B)=5.0 V) to 23.5 ns (VCC(A)=1.5 V, VCC(B)=1.5 V) over -40 °C to +125 °C.

Key Specifications

Pinout & Package

XSON8 package (SOT1203), 1.35 × 1.0 × 0.35 mm, no leads, 8-terminal surface-mount construction optimized for space-constrained PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TXS0102DCUR and SN74AVC2T244RSWR, the 74LVCH2T45GS,115 uniquely combines explicit DIR control, bus hold, IOFF, and full suspend-mode behavior - making it the only option among the three qualified for mixed-voltage, hot-pluggable, or floating-bus industrial systems.

Availability

74LVCH2T45GS,115 is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and IoT sensor hub designs requiring stable component supply across extended temperature and mixed-voltage operating conditions.

Supply support for 74LVCH2T45GS,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 focused on essential efficiency-enhancing components, delivering high-performance, reliable, and scalable solutions for automotive, industrial, and consumer markets.

The 74LVCH2T45 belongs to Nexperia's LVC/LVCH logic family, engineered specifically for low-voltage, mixed-rail system interfacing with emphasis on power efficiency, robustness, and seamless integration into space- and thermal-constrained designs.

FAQ

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

The datasheet does not specify a maximum differential voltage limit. Both supplies are rated from 1.2 V to 5.5 V independently, and operation is fully characterized across all combinations within that range - including VCC(A) = 1.2 V and VCC(B) = 5.5 V. Absolute maximum ratings allow each supply to reach +6.5 V, but functional operation is only guaranteed within the 1.2–5.5 V recommended range.

Does the 74LVCH2T45GS,115 require external pull-up or pull-down resistors on its I/O pins?

No. The 74LVCH2T45GS,115 includes active bus hold circuitry on all A and B port inputs, which maintains a valid logic level (HIGH or LOW) when inputs are floating. This eliminates the need for external pull resistors in most applications, reducing component count and PCB footprint.

How does the device behave when only one supply (e.g., VCC(A)) is powered?

When either VCC(A) or VCC(B) is at GND while the other is powered, the device enters suspend mode: both A and B ports go to high-impedance OFF-state, and IOFF protection prevents damaging backflow current. This behavior is intrinsic and requires no external control - critical for staged power-up/down sequences.

Can DIR be driven from a different voltage domain than VCC(A)?

No. The DIR input is explicitly referenced to VCC(A), and its VIH/VIL thresholds scale with VCC(A) (e.g., VIH = 0.65×VCC(A) for 1.4–1.95 V operation). Driving DIR from a different supply violates the input specification and may cause undefined logic states or increased leakage.