Nexperia USA Inc. 74LVC2T45DC,125

Overview

74LVC2T45DC,125 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), direction control (DIR), IOFF partial power-down protection, and operates across –40 °C to +125 °C. Used in mixed-voltage FPGA-to-ASIC interconnects, microcontroller GPIO expansion, and battery-powered sensor hubs.

For engineers reviewing the 74LVC2T45DC,125 datasheet, 74LVC2T45DC,125 pinout, 74LVC2T45DC,125 application, or 74LVC2T45DC,125 equivalent, key selection criteria include dual-rail supply flexibility, IOFF-enabled safe power sequencing, suspend-mode high-impedance behavior, and verified 420 Mbps data rate for 3.3 V ↔ 5.0 V translation.

Technical Context

The device implements a bidirectional bus transceiver architecture where DIR controls signal flow direction: HIGH enables A→B translation, LOW enables B→A. Each port is referenced to its own supply (VCC(A) and VCC(B)), allowing independent voltage domain operation without level-shifting external components.

IOFF circuitry disables outputs when either VCC(A) or VCC(B) is at GND, preventing backflow current during partial power-down. Suspend mode forces both ports into high-impedance OFF-state, while bus hold (on 74LVCH2T45 variant) is not present in the 74LVC2T45DC,125 - confirmed by absence of IBHL/IBHH specs in its static characteristics table.

Key Specifications

Pinout & Package

VSSOP8 package (SOT765-1): plastic very thin shrink small outline, 8 leads, 2.3 mm body width, lead pitch 0.5 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC2T45DCTR, the 74LVC2T45DC,125 offers superior thermal performance in compact designs; compared with 74LVCH2T45DC,125, it trades bus-hold functionality for lower static current and reduced input capacitance - critical for high-speed, low-power sensor aggregation.

Availability

74LVC2T45DC,125 is available at Aetrix Electronics and suitable for industrial sensor hubs, automotive body control modules, battery-powered wearables, and FPGA-to-MCU bridges requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74LVC2T45DC,125 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, discrete, and MOSFET solutions optimized for efficiency, reliability, and miniaturization in automotive, industrial, and mobile applications.

The 74LVC2T45DC,125 belongs to Nexperia's LVC logic family - engineered for low-voltage, high-speed bidirectional translation in space- and power-constrained embedded systems with mixed-supply architectures.

FAQ

Does the 74LVC2T45DC,125 support asymmetric voltage translation such as 1.2 V ↔ 3.3 V?

Yes. The device fully supports asymmetric dual-supply operation: VCC(A) and VCC(B) may be set independently within 1.2 V to 5.5 V. Translation between 1.2 V and 3.3 V is explicitly validated in the datasheet's dynamic characteristics tables, with measured tPLH/tPHL delays and guaranteed 75 Mbps data rate at that combination.

What happens to the outputs when only VCC(A) is powered and VCC(B) = 0 V?

In this condition, the device enters suspend mode: both port A and port B outputs go to high-impedance OFF-state. The IOFF circuitry actively disables output drivers to prevent backflow current from VCC(A) into the grounded VCC(B) rail, protecting downstream circuitry and meeting IEC 61000-4-5 surge immunity requirements.

Is the DIR input 5 V tolerant when VCC(A) = 1.8 V?

No. DIR is referenced to VCC(A), so its VIH/VIL thresholds scale with VCC(A). At VCC(A) = 1.8 V, VIH(min) = 0.65 × 1.8 V = 1.17 V and VIL(max) = 0.35 × 1.8 V = 0.63 V. Applying 5 V to DIR violates absolute maximum rating (VCC(A) + 0.5 V max), risking latch-up or permanent damage.

How does the 74LVC2T45DC,125 differ from the 74LVCH2T45DC,125 in terms of bus-hold functionality?

The 74LVC2T45DC,125 lacks bus-hold circuitry entirely - its I/O pins float when undriven. In contrast, the 74LVCH2T45DC,125 integrates active bus-hold on all A/B port pins (IBHL/IBHH ≥ ±19 μA at 1.2 V), holding unused inputs at valid logic levels without external resistors. This difference is reflected in distinct static current specs and absence of bus-hold parameters in the LVC variant's datasheet tables.