Nexperia USA Inc. 74LVCH2T45GT,115

Overview

74LVCH2T45GT,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 direction (A↔B), IOFF-enabled partial power-down, and active bus hold on all I/O pins. It is used in mixed-voltage FPGA-to-ASIC interconnects requiring voltage domain isolation and low-power suspend operation.

For engineers reviewing the 74LVCH2T45GT,115 datasheet, 74LVCH2T45GT,115 pinout, 74LVCH2T45GT,115 application, or 74LVCH2T45GT,115 equivalent, key selection criteria include dual-supply translation range (1.2–5.5 V), maximum 420 Mbps data rate (3.3 V → 5.0 V), IOFF leakage < ±2 μA at 125 °C, bus hold current up to ±500 μA, and XSON8 package thermal performance (3.1 mW/K derating above 68 °C).

Technical Context

This device implements a dual-port, direction-controlled bidirectional buffer architecture where DIR selects signal path: HIGH enables A→B translation, LOW enables B→A. Each port is referenced to its own supply (VCC(A) for A-side signals and DIR, VCC(B) for B-side), allowing independent voltage domain operation without level-shifting external components.

IOFF circuitry actively disables outputs when either VCC(A) or VCC(B) is at GND, preventing backflow current during partial power-down. Bus hold logic maintains valid logic states on floating A/B inputs-critical for hot-swap and unpowered interface scenarios-without external pull resistors.

Key Specifications

Pinout & Package

XSON8 plastic extremely thin small outline package (SOT833-1); 8-terminal, no-lead surface-mount; body dimensions 1.0 mm × 1.95 mm × 0.5 mm; thermal pad optional; moisture sensitivity level MSL3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AVC2T244RSVR and TXS0102DCUR, the 74LVCH2T45GT,115 uniquely supports asymmetric 1.2–5.5 V translation, provides deterministic DIR-controlled directionality, guarantees IOFF isolation, and delivers 2.1× higher bandwidth than the TXS0102DCUR in 3.3 V → 5.0 V mode.

Availability

74LVCH2T45GT,115 is available at Aetrix Electronics and suitable for industrial automation gateways, automotive domain controllers, 5G infrastructure basebands, and medical imaging subsystems requiring stable component supply across extended temperature and voltage ranges.

Supply support for 74LVCH2T45GT,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 logic, discrete, and MOSFET solutions optimized for efficiency, miniaturization, and robustness in high-volume applications.

The 74LVCH2T45GT,115 belongs to Nexperia's LVC/LVCH logic family, engineered specifically for low-voltage, mixed-rail digital interfacing in space-constrained, thermally demanding environments such as automotive ECUs and portable medical devices.

FAQ

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

No minimum voltage difference is specified-the device operates correctly with VCC(A) = 1.2 V and VCC(B) = 5.5 V, or vice versa. The absolute minimum and maximum for each supply are independent: 1.2 V to 5.5 V per rail. This allows full flexibility in bridging disparate voltage domains without constraint on relative rail magnitudes.

Does the 74LVCH2T45GT,115 require external pull-up or pull-down resistors on its I/O pins?

No. The 74LVCH2T45GT,115 integrates active bus hold circuitry on all A- and B-port pins, providing ±500 μA holding current at 3.6 V. This eliminates the need for external resistors to prevent floating inputs, reducing PCB area, BOM cost, and potential noise coupling from resistor networks.

How does IOFF behavior differ between 74LVCH2T45GT,115 and standard 74LVC2T45 variants?

The 74LVCH2T45GT,115 includes enhanced IOFF circuitry that actively disables outputs and limits leakage to ±2 μA at +125 °C when either VCC(A) or VCC(B) is at GND. Standard 74LVC2T45 lacks this feature and may allow damaging backflow current during partial power-down, making the LVCH variant mandatory for rail-sequenced systems.

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) (LOW) to 0.65×VCC(A) (HIGH) for guaranteed switching. Driving DIR from VCC(B) or another supply violates input voltage specifications and risks undefined operation or latch-up. A level shifter is required if DIR originates outside the VCC(A) domain.