Diodes Incorporated 74LVC1T45Z6-7

Overview

74LVC1T45Z6-7 from Diodes Incorporated is a single-bit, dual-supply translating transceiver in SOT563 package with 3-state outputs, enabling bidirectional voltage-level translation between 1.65V–5.5V domains. It features independent VCCA and VCCB supplies, direction control via DIR pin referenced to VCCA, and I_OFF protection ensuring high-impedance isolation when either supply is at 0 V. Used in mobile interface bridging where 1.8V SoC communicates with 3.3V peripheral.

For engineers reviewing the 74LVC1T45Z6-7 datasheet, 74LVC1T45Z6-7 pinout, 74LVC1T45Z6-7 application, or 74LVC1T45Z6-7 equivalent, key selection criteria include dual-rail translation range, ±24mA drive at 3.3V, 16µA max ICC, I_OFF behavior, and SOT563 thermal resistance (290°C/W).

Technical Context

This transceiver implements a direction-controlled, bidirectional data path with separate input/output voltage references: A-side logic levels track VCCA (1.65–5.5V), B-side tracks VCCB (1.65–5.5V), and DIR is referenced solely to VCCA. The device supports true 3-state output disable and I_OFF functionality-both triggered when either VCCA or VCCB drops to 0 V-ensuring no backflow current and electrical isolation up to 5.5V on A/B pins during partial power-down.

Propagation delays are asymmetric and supply-dependent: e.g., tpLH(A→B) ranges from 0.7 ns (VCCA=3.3V, VCCB=3.3V) to 17.7 ns (VCCA=1.8V, VCCB=1.8V); enable/disable times (tpHZ/tpLZ) vary from 2.4 ns to 21.9 ns depending on rail combinations. Input hysteresis (~100mV typical) enhances noise immunity in noisy mixed-voltage environments.

Key Specifications

Pinout & Package

SOT563 (6-pin, 1.6mm × 1.6mm × 0.55mm) surface-mount package with exposed thermal pad; footprint compatible with JEDEC MO-252 standard. Pin 1 marked by chamfered corner.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar single-bit translating transceiver applications.

Compared with SN74LVC1T45DCKR and FXMA108MUTAG, the 74LVC1T45Z6-7 uniquely combines SOT563's compact thermal profile, full 1.65–5.5V dual-rail flexibility, and explicit DIR control-making it optimal for production-grade, size- and voltage-critical embedded interfaces.

Availability

74LVC1T45Z6-7 is available at Aetrix Electronics and suitable for mobile device integration, industrial sensor interfacing, USB-C power delivery subsystems, and automotive infotainment displays requiring stable component supply across extended temperature and mixed-voltage operating conditions.

Supply support for 74LVC1T45Z6-7 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

Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal solutions for power management, signal integrity, and connectivity applications.

The 74LVC1T45 belongs to Diodes' LVC logic family, engineered for ultra-low-voltage translation in portable, battery-powered, and thermally constrained systems where dual-rail interoperability and I_OFF safety are mandatory.

FAQ

Can 74LVC1T45Z6-7 translate between 1.2V and 3.3V domains?

No. The absolute minimum VCCA and VCCB is 1.65V per datasheet DS35804 Rev. 4–2. Operating below 1.65V violates recommended conditions and risks incorrect logic thresholds, increased propagation delay, and potential failure to meet VOL/VOH specifications. For 1.2V interfaces, consider dedicated ultra-low-voltage translators like TXS0102.

What happens to the A and B pins when VCCA = 0V and VCCB = 3.3V?

Both A and B pins enter I_OFF mode: output drivers disable, and leakage remains ≤±2μA. The A pin becomes high-impedance and tolerant up to 5.5V, preventing back-current into the dead VCCA rail. B pin remains functional only if DIR is asserted and VCCB is active-but no valid data transfer occurs without VCCA powering the direction logic.

Is the SOT563 package RoHS-compliant and lead-free?

Yes. Per Diodes Incorporated documentation (Notes 1–3 in DS35804), the 74LVC1T45Z6-7 uses totally lead-free construction, complies fully with EU RoHS directives 2002/95/EC, 2011/65/EU, and 2015/863/EU, and is halogen- and antimony-free ("Green" device with Br+Cl <1500ppm, Sb <1000ppm).

How does the 100mV typical hysteresis improve system reliability?

The input hysteresis reduces susceptibility to noise-induced glitches on DIR, A, or B pins-especially critical in shared PCB traces near switching regulators or RF sections. It ensures clean state transitions even with slow-rising signals or marginal noise margins, eliminating metastability in direction control and preventing unintended bus contention during voltage ramp-up/down sequences.