Nexperia USA Inc. 74AVCH2T45DC,125

Overview

74AVCH2T45DC,125 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 active bus hold. Used in mixed-voltage SoC interconnects, such as translating between a 1.8 V FPGA I/O bank and a 3.3 V peripheral interface.

For engineers reviewing the 74AVCH2T45DC,125 datasheet, 74AVCH2T45DC,125 pinout, 74AVCH2T45DC,125 application, or 74AVCH2T45DC,125 equivalent, key selection criteria include bidirectional translation capability across sub-1.2 V to 3.3 V rails, suspend-mode behavior during partial power-down, bus hold current specifications at 1.2 V/1.65 V, and propagation delay asymmetry (A→B vs B→A) under varying VCC combinations.

Technical Context

The device implements a dual-rail CMOS transceiver architecture with independent VCC(A) and VCC(B) supplies, where DIR-referenced solely to VCC(A)-controls data flow direction: HIGH enables A→B, LOW enables B→A. Both ports support 3-state operation and IOFF circuitry disables outputs when either supply drops to GND, preventing backflow current.

Bus hold circuitry actively maintains unused inputs at valid logic levels without external resistors, with specified IBHL/IBHH currents at 1.2 V, 1.65 V, and 2.3 V. Dynamic performance is characterized by asymmetric propagation delays (e.g., 5.7 ns A→B vs 4.5 ns B→A at VCC(A)=2.5 V/VCC(B)=1.8 V, -40 °C to +85 °C), and enable/disable timing derived from tpd + tdis combinations per direction.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with TXS0102DCUR and SN74AVC2T245RSWR, the 74AVCH2T45DC,125 uniquely combines 500 Mbps capability, integrated bus hold, and full 0.8–3.6 V compatibility - making it optimal for compact, high-speed, low-BOM mixed-voltage interconnects where reliability across wide temperature and partial power-down conditions is mandatory.

Availability

74AVCH2T45DC,125 is available at Aetrix Electronics and suitable for mobile SoC integration, FPGA peripheral bridging, automotive ADAS sensor hubs, and industrial PLC I/O modules requiring stable component supply across extended temperature ranges and mixed-voltage domain interoperability.

Supply support for 74AVCH2T45DC,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 leading semiconductor manufacturer specializing in high-performance logic, analog, and discrete components, with global R&D and manufacturing infrastructure focused on automotive, industrial, and computing markets.

The 74AVCH2T45 belongs to Nexperia's advanced voltage translator product line, engineered specifically for ultra-low-voltage, high-speed, and power-aware system-level interconnects in next-generation portable and embedded platforms.

FAQ

Can 74AVCH2T45DC,125 translate between 0.8 V and 1.2 V simultaneously?

Yes. VCC(A) and VCC(B) operate independently within 0.8 V to 3.6 V, allowing simultaneous 0.8 V ↔ 1.2 V translation. The device guarantees correct logic thresholds and output drive at both rails, with static characteristics validated down to 0.8 V in the datasheet's Table 8 and dynamic performance confirmed in Table 9.

What happens to the I/O ports when DIR is floating?

DIR is referenced to VCC(A) and has no internal pull-up/down. A floating DIR may result in undefined direction control, causing unpredictable data flow or bus contention. The datasheet mandates explicit control: tie DIR to VCC(A) or GND via a dedicated GPIO or resistor. Bus hold does not apply to DIR.

Does the device support hot insertion with one supply powered and the other off?

Yes. IOFF circuitry ensures that when either VCC(A) or VCC(B) is at GND, both ports enter high-impedance OFF-state with leakage ≤ ±5 μA (Table 8). This prevents back-driving and damage during hot-swap events, satisfying JEDEC JESD78 Class II latch-up immunity (>100 mA).

How does bus hold behave during suspend mode?

Bus hold remains active on both A and B ports during suspend mode (when either VCC is at GND), maintaining last-valid logic state on floating inputs. Measured IBHL/IBHH values at 1.2 V and 1.65 V (Table 8) confirm sustained holding current even under partial power-down conditions.