Renesas IDT74LVC4245AQG

Overview

IDT74LVC4245AQG from Integrated Device Technology is an octal noninverting bus transceiver with dual-supply voltage translation (3.3V ↔ 5V), ±24mA drive strength, rail-to-rail output swing, 5V-tolerant I/O, and industrial temperature range (–40°C to +85°C). It enables bidirectional asynchronous data transfer between mixed-voltage buses in embedded control and interface subsystems.

For engineers reviewing the IDT74LVC4245AQG datasheet, IDT74LVC4245AQG pinout, IDT74LVC4245AQG application, or IDT74LVC4245AQG equivalent, key selection criteria include VCCA/VCCB supply separation, DIR/OE control logic, 3-state output timing (tPLZ ≤ 9.8 ns), and compatibility with SOIC/SSOP/QSOP/TSSOP footprints in space-constrained industrial designs.

Technical Context

The IDT74LVC4245AQG implements a dual-rail CMOS architecture with independent VCCA (5V ±0.5V) and VCCB (2.7V–3.6V) supplies, enabling true bidirectional level shifting without external biasing. Its DIR pin controls data direction (A→B or B→A), while active-low OE forces both ports into high-impedance state regardless of DIR state.

All 16 I/O pins (A1–A8, B1–B8) are 5V tolerant and feature input hysteresis (100 mV typical) for noise immunity. The device uses 0.5 µm CMOS process, delivers rail-to-rail swing, supports hot insertion, and maintains <6.7 ns propagation delay (B→A) across full industrial temperature range.

Key Specifications

Pinout & Package

Package: 24-pin QSOP (QG suffix), lead-free, RoHS-compliant, body size 8.65 mm × 3.9 mm.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bus transceiver and voltage translation applications.

Compared with SN74LVC4245APWR and 74AVC4245PW, the IDT74LVC4245AQG provides guaranteed 5V tolerance, industrial temperature qualification, and optimized 3.3V↔5V performance - making it the preferred choice for ruggedized industrial and telecom equipment where reliability and voltage safety margins are critical.

Availability

IDT74LVC4245AQG is available at Aetrix Electronics and suitable for industrial PLC backplanes, telecom line card interfaces, and automated test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for IDT74LVC4245AQG 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

Integrated Device Technology (IDT), now part of Renesas Electronics, is a fabless semiconductor company specializing in timing, memory interface, RF, and high-performance interconnect solutions.

The IDT74LVC4245AQG belongs to IDT's LVC logic family, designed specifically for robust voltage translation and bus interfacing in industrial and communications infrastructure where mixed-supply interoperability and reliability are essential.

FAQ

What is the maximum capacitive load the IDT74LVC4245AQG can drive while maintaining specified timing?

The IDT74LVC4245AQG is characterized with CL = 50 pF in its switching specifications, and its ±24 mA drive strength ensures full timing compliance (e.g., tPLH ≤ 6.3 ns) under this load. Driving >50 pF may increase propagation delay and reduce noise margin; for heavier loads, verify timing margins using the device's output impedance model and board-level simulation. The IDT74LVC4245AQG datasheet specifies performance up to 50 pF at VCCA = 5V and VCCB = 3.3V.

Can the IDT74LVC4245AQG operate with VCCB = 2.7V and VCCA = 5.5V simultaneously?

Yes - the IDT74LVC4245AQG is fully specified for simultaneous operation at VCCB = 2.7V to 3.6V and VCCA = 4.5V to 5.5V. DC electrical characteristics (VIH/VIL, VOH/VOL) and switching parameters (tPLH, tPHL) are guaranteed across this combined operating range, including worst-case corners (–40°C, VCCA = 5.5V, VCCB = 2.7V). The IDT74LVC4245AQG maintains 5V tolerance on all I/O pins under these conditions.

Is the IDT74LVC4245AQG pin-compatible with the standard 74LVC4245A in SOIC-24 package?

Yes - the IDT74LVC4245AQG shares identical pinout, function mapping, and electrical behavior with the industry-standard 74LVC4245A in SOIC-24, SSOP-24, QSOP-24, and TSSOP-24 packages. The QG suffix denotes QSOP packaging with green (lead-free) finish, but the pin configuration and logic behavior match the base 74LVC4245A family. The IDT74LVC4245AQG may be used as a direct replacement in existing designs using compatible footprints.

Does the IDT74LVC4245AQG require external pull-up or pull-down resistors on DIR or OE?

No - the IDT74LVC4245AQG has no internal pull resistors on DIR or OE, but its inputs are CMOS-compatible with rail-to-rail thresholds and hysteresis. External biasing is only needed if floating states must be avoided in system power-up sequencing; typical practice is to tie OE to VCCA via a 10 kΩ resistor for default disable, and DIR to GND or VCCA depending on default direction. The IDT74LVC4245AQG does not mandate external resistors but benefits from controlled startup states.

How does the IDT74LVC4245AQG handle mismatched supply ramp rates during power-up?

The IDT74LVC4245AQG incorporates power-on reset circuitry that holds outputs in high-impedance until both VCCA and VCCB exceed their minimum thresholds (VCCA > 4.5V, VCCB > 2.7V). This prevents bus contention during asymmetric power sequencing. The device tolerates VCCA ramping before VCCB or vice versa, provided absolute maximum ratings (e.g., VTERM ≤ +6.5V) are not exceeded. The IDT74LVC4245AQG ensures safe initialization even with >100 ms supply skew.