NXP Semiconductors 74AVCH2T45GD,125

Overview

74AVCH2T45 from Nexperia is a dual-bit, dual-supply voltage level translator/transceiver enabling bidirectional logic-level translation between 0.8 V and 3.6 V domains. It features two I/O ports (1A/2A referenced to VCC(A), 1B/2B to VCC(B)), DIR-controlled directionality, IOFF partial power-down, and integrated bus hold on all data pins. Used in mixed-voltage SoC interconnects, such as translating between a 1.2 V FPGA I/O bank and a 3.3 V sensor interface.

For engineers reviewing the 74AVCH2T45 datasheet, 74AVCH2T45 pinout, 74AVCH2T45 application, or 74AVCH2T45 equivalent, key selection criteria include bidirectional translation capability across ultra-low voltages (0.8 V), IOFF protection during asymmetric power-down, bus hold elimination of external resistors, and verified 500 Mbps throughput in 1.8 V → 3.3 V mode.

Technical Context

The 74AVCH2T45 implements a dual-rail CMOS transceiver architecture with independent VCC(A) and VCC(B) supplies, where DIR input (referenced to VCC(A)) controls signal flow direction: HIGH enables A→B, LOW enables B→A. Its IOFF circuitry actively disables outputs when either supply drops to GND, preventing backflow current and ensuring safe suspend-mode operation.

Bus hold circuitry maintains valid logic states on floating 1A/2A/1B/2B inputs without external biasing-sourcing/sinking ≥100 μA at 3.0 V VCC-and supports full industrial temperature range (−40 °C to +125 °C) with JEDEC-compliant voltage standards across five logic families (JESD8-12 through JESD8-B).

Key Specifications

Pinout & Package

74AVCH2T45 is packaged in VSSOP8 (SOT765-1), an 8-pin plastic very thin shrink small outline package with 2.3 mm body width and 0.5 mm pitch. Pin 1 indicator is located below the marking code (K45) in the lower-left corner.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-supply voltage translation applications.

Compared with SN74AVC2T245RSWR and TXB0102DCUR, the 74AVCH2T45 uniquely combines 500 Mbps throughput, IOFF protection, and bus hold-making it optimal for high-reliability, high-density, mixed-voltage embedded systems requiring minimal external components and guaranteed suspend-mode safety.

Availability

74AVCH2T45 is available at Aetrix Electronics and suitable for mobile SoC interconnects, FPGA-to-peripheral bridging, automotive body control modules, and industrial sensor hubs requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74AVCH2T45 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 technologies, delivering high-performance logic, analog, and MOSFET solutions for automotive, industrial, and consumer markets.

The 74AVCH2T45 belongs to Nexperia's advanced voltage translator product line, engineered specifically for ultra-low-voltage system integration where power efficiency, signal integrity, and robustness across mixed-rail environments are critical.

FAQ

What is the minimum allowed VCC(A) and VCC(B) voltage for functional operation?

The 74AVCH2T45 operates reliably down to 0.8 V on both VCC(A) and VCC(B) rails, with static and dynamic specifications fully guaranteed across this range. Below 0.8 V, parameters like VOL, VOH, and tpd degrade outside datasheet limits-so 0.8 V is the absolute functional floor, not just an absolute maximum rating.

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

No-DIR is strictly referenced to VCC(A), and its input thresholds (VIH/VIL) scale directly with VCC(A). Driving DIR from a different rail (e.g., VCC(B)) violates the absolute maximum ratings and may cause undefined behavior or latch-up. Always drive DIR from the same supply as VCC(A).

How does bus hold behave when one supply is powered and the other is at 0 V?

When VCC(A) = 0 V and VCC(B) = 1.8 V, bus hold remains active only on the B-side pins (1B, 2B), while A-side pins (1A, 2A) enter high-impedance with no hold. Conversely, if VCC(B) = 0 V, only A-side pins retain bus hold. This asymmetry ensures signal integrity on the powered side during partial power-down.

Is there a recommended power-up sequence for reliable initialization?

Yes-GND must be established first, followed by ramping either or both VCC(A) and VCC(B). No specific sequencing between VCC(A) and VCC(B) is required, and DIR may float during power-up; the device enters a known high-impedance state until valid VCC and DIR levels are applied.