Nexperia USA Inc. 74LVCH2T45DC,125

Overview

74LVCH2T45DC,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, and active bus hold. Used in mixed-voltage SoC interconnects, such as FPGA-to-ASIC communication across 1.8 V/3.3 V domains.

For engineers reviewing the 74LVCH2T45DC,125 datasheet, 74LVCH2T45DC,125 pinout, 74LVCH2T45DC,125 application, or 74LVCH2T45DC,125 equivalent, this device supports critical voltage translation tasks in industrial controllers, automotive body electronics, and portable computing where supply domain isolation and suspend-mode leakage control are mandatory.

Technical Context

The 74LVCH2T45DC,125 implements true dual-rail operation: port A (pins 1A, 2A, DIR, VCC(A)) references VCC(A); port B (pins 1B, 2B, VCC(B)) references VCC(B). Direction control is asynchronous - DIR HIGH enables A→B data flow; DIR LOW enables B→A flow. Both ports enter high-impedance OFF-state when either VCC(A) or VCC(B) = GND (suspend mode).

Its IOFF circuitry disables outputs during power-down, limiting backflow current to ±2 μA at -40 °C to +125 °C. Active bus hold on all I/O pins maintains valid logic levels on floating inputs without external pull resistors, with IBHL/IBHH up to ±100 μA at VCCI = 4.5 V.

Key Specifications

Pinout & Package

VSSOP8 package (SOT765-1), 2.3 mm body width, 0.5 mm pitch, 8-pin surface-mount with exposed pad not present. Pin 1 indicator located below marking code in lower-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AVC2T245RSWR and TXS0202DCUR, the 74LVCH2T45DC,125 uniquely supports 5.5 V B-side operation, includes bus hold for floating-input resilience, and delivers 420 Mbps throughput - making it the sole choice for mixed-domain, high-speed, and hot-swap-critical designs.

Availability

74LVCH2T45DC,125 is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive ADAS sensor hubs, portable medical monitors, and server baseboard management requiring stable component supply across extended temperature and mixed-voltage environments.

Supply support for 74LVCH2T45DC,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 focused on high-volume, high-reliability logic, analog, and MOSFET solutions, serving automotive, industrial, and consumer markets with ISO/TS 16949-certified manufacturing.

The 74LVCH2T45DC,125 belongs to Nexperia's LVC/LVCH advanced logic family, engineered specifically for robust voltage translation in thermally demanding, mixed-rail embedded systems where power sequencing, ESD immunity, and long-term parametric stability are non-negotiable.

FAQ

Can 74LVCH2T45DC,125 translate between 1.2 V and 5.0 V simultaneously?

Yes. VCC(A) may be set to 1.2 V while VCC(B) is set to 5.0 V - the device fully supports this combination per its recommended operating conditions (1.2 V–5.5 V on each rail). Propagation delay remains within spec (≤10.6 ns A→B), and output VOH/VOL meet 5.0 V logic thresholds with ±24 mA drive capability at VCC(B) = 3.0 V.

Does the DIR pin require termination when unused?

No. The DIR input has active bus hold, which maintains a valid logic level (HIGH or LOW depending on last driven state) without external resistors. However, for deterministic startup behavior, tie DIR to VCC(A) or GND via a 10 kΩ resistor - especially in systems where power-on sequencing may leave DIR floating longer than bus hold activation time (~100 ns).

What happens if only VCC(A) is powered and VCC(B) = 0 V?

The device enters suspend mode: both port A and port B outputs go to high-impedance OFF-state, and IOFF limits leakage to ±2 μA. Port A inputs remain functional (if driven), but port B pins are electrically isolated. This behavior protects downstream 5 V circuitry from backfeed when the B-side rail is off.

Is the 74LVCH2T45DC,125 RoHS and REACH compliant?

Yes. Nexperia certifies the 74LVCH2T45DC,125 as RoHS Directive 2011/65/EU compliant (Pb-free, halogen-free) and REACH SVHC-free per latest declaration. The VSSOP8 package uses matte tin lead finish, and material content reports are available through Nexperia's Product Change Notification portal.