NXP Semiconductors 74LVCH2T45GN,115

Overview

74LVCH2T45GN,115 from Nexperia is a dual-bit, dual-supply translating transceiver with 3-state outputs enabling bidirectional level translation between 1.2 V and 5.5 V domains. It features independent VCC(A) and VCC(B) supplies, DIR-controlled data flow (A↔B), IOFF-enabled partial power-down, and active bus hold on I/O pins. Used in mixed-voltage FPGA-to-ASIC interconnects where 1.8 V logic interfaces with 3.3 V peripherals.

For engineers reviewing the 74LVCH2T45GN,115 datasheet, 74LVCH2T45GN,115 pinout, 74LVCH2T45GN,115 application, or 74LVCH2T45GN,115 equivalent, key selection criteria include dual-rail voltage flexibility (1.2–5.5 V per port), 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 direction-controlled bidirectional buffer architecture with separate supply references: nA and DIR pins tied to VCC(A), while nB pins reference VCC(B). The IOFF circuit enforces high-impedance output states when either supply drops to GND, preventing backflow current during partial power-down sequences.

Bus hold circuitry actively maintains valid logic levels on unused A/B port inputs without external pull resistors-critical for robustness in hot-swap or low-power suspend scenarios. Propagation delays are asymmetric and voltage-dependent, with tPLH/tPHL ranging from 0.7 ns (5.0 V → 3.3 V) to 23.5 ns (1.5 V → 1.5 V) over full temperature range.

Key Specifications

Pinout & Package

XSON8 package (SOT1116), 1.2 mm × 1.0 mm × 0.35 mm body, no leads, 8-terminal surface-mount construction optimized for high-density PCB layouts and thermal performance in space-constrained modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AVCH2T45RSWR and TXS0102DCUR, the 74LVCH2T45GN,115 uniquely combines bus hold, IOFF, and full -40 °C to +125 °C suspend-mode operation - making it the only choice for automotive and industrial applications requiring guaranteed fault-safe isolation during supply transients.

Availability

74LVCH2T45GN,115 is available at Aetrix Electronics and suitable for industrial sensor hubs, automotive body control modules, FPGA-to-MCU interconnects, and low-power IoT edge nodes requiring stable component supply across extended temperature and voltage ranges.

Supply support for 74LVCH2T45GN,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, reliable components for automotive, industrial, and consumer electronics markets with focus on efficiency and sustainability.

The 74LVCH2T45GN,115 belongs to Nexperia's LVC/LVCH logic family designed specifically for robust, low-power, mixed-voltage digital interfacing in harsh environments and thermally constrained applications.

FAQ

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

VCC(A) and VCC(B) may differ by up to 4.3 V (e.g., 1.2 V and 5.5 V simultaneously), as both supplies are independently rated from -0.5 V to +6.5 V relative to GND. Absolute maximum ratings permit this differential, and functional operation is guaranteed across the full 1.2 V–5.5 V range for each rail per datasheet Table 5 and Table 6.

Does the 74LVCH2T45GN,115 support hot insertion?

Yes - IOFF circuitry ensures outputs enter high-impedance state when either VCC drops to GND, preventing back-current flow during live board insertion. Combined with bus hold, this allows safe hot-plug operation in modular backplane systems without risk of latch-up or supply rail disturbance.

How does bus hold behave when VCC(A) = 0 V but VCC(B) is active?

In suspend mode (VCC(A) = 0 V), bus hold remains inactive on A-port pins since its circuitry requires VCC(A) bias; however, B-port pins retain bus hold functionality powered by VCC(B). This asymmetry ensures B-side signals remain stable while A-side floats safely in high-Z.

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

No - DIR is strictly referenced to VCC(A) and must be driven within 0.2×VCC(A) to 0.8×VCC(A) for valid logic thresholds per Table 8. Driving DIR from VCC(B) or another rail violates input voltage limits and risks undefined operation or increased leakage.