onsemi NLV74LCX245DTR2G

Overview

NLV74LCX245DTR2G from onsemi is a low-voltage CMOS octal transceiver with 5 V-tolerant inputs/outputs, non-inverting bidirectional data flow, 1.65–5.5 V supply operation, and 24 mA output drive at 3.0 V - used for memory address driving and TTL-level bus interfacing in mixed-voltage systems.

For engineers reviewing the NLV74LCX245DTR2G datasheet, pinout, applications, or equivalent options, key selection criteria include 5 V tolerance with sub-2 V VCC operation, T/R-controlled directionality, OE-gated 3-state outputs, and TSSOP-20 packaging for space-constrained board designs.

Technical Context

The NLV74LCX245DTR2G implements a dual-bus, bidirectional transceiver architecture where the Transmit/Receive (T/R) input selects data direction between A and B ports, while Output Enable (OE) independently places both ports into high-impedance state. It supports live insertion and withdrawal via IOFF protection that guarantees high-impedance when VCC = 0 V.

Its logic interface is compatible with both LVTTL and LVCMOS families, and its 5.5 V absolute maximum input voltage rating enables safe interfacing with legacy 5 V TTL devices even when VCC is as low as 1.65 V - critical for voltage translation in heterogeneous digital subsystems.

Key Specifications

Pinout & Package

TSSOP-20 package (Case 948E), 0.65 mm pitch, 4.4 mm × 6.5 mm body, lead-free (G suffix), moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal transceiver applications.

Compared with SN74LVC245APWR and 74ALVC245PW,118, the NLV74LCX245DTR2G uniquely combines 5 V tolerance, IOFF protection, and 5.0 ns max propagation delay - making it the only option among the three qualified for hot-swap-capable, mixed-voltage industrial backplanes requiring sub-10 ns timing.

Availability

NLV74LCX245DTR2G is available at Aetrix Electronics and suitable for memory address driving, industrial bus interfacing, hot-swappable module backplanes, and legacy system upgrade bridges requiring stable component supply across automotive, industrial, and telecom end markets.

Supply support for NLV74LCX245DTR2G 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient electronics, delivering silicon solutions for automotive, industrial, cloud, medical, and IoT applications.

The NLV74LCX245DTR2G belongs to the LCX low-voltage CMOS logic family - designed specifically for mixed-voltage system interfacing, voltage translation, and bus isolation in harsh-environment industrial and automotive control units.

FAQ

What is the maximum operating temperature range for NLV74LCX245DTR2G?

The NLV74LCX245DTR2G is rated for operation from −55 °C to +125 °C ambient temperature. This extended range is validated per the datasheet's Recommended Operating Conditions table and supports deployment in under-hood automotive modules, industrial motor drives, and outdoor telecom equipment where thermal stress exceeds commercial-grade limits. The NLV74LCX245DTR2G maintains full electrical performance across this range without derating.

Does NLV74LCX245DTR2G support true bidirectional data flow without external control logic?

Yes, NLV74LCX245DTR2G supports true bidirectional data flow using only two control inputs: T/R determines direction (A→B or B→A), and OE enables/disables both ports simultaneously. No external latches, clocks, or direction registers are needed - the internal transceiver architecture handles real-time, cycle-by-cycle direction switching. This makes NLV74LCX245DTR2G ideal for dynamic bus arbitration in microcontroller-based systems.

Can NLV74LCX245DTR2G be used to interface a 1.8 V FPGA to a 5 V ADC without level shifters?

Yes, NLV74LCX245DTR2G can safely interface a 1.8 V FPGA to a 5 V ADC because its inputs and outputs are 5 V-tolerant up to 5.5 V, and it operates down to 1.65 V VCC. When powered at 1.8 V, the NLV74LCX245DTR2G accepts 5 V logic levels on either port and outputs valid 1.8 V-compatible signals - eliminating external level-shifting components while preserving timing margins verified in the AC Electrical Characteristics table.

Is NLV74LCX245DTR2G pin-compatible with standard 74LCX245 variants?

Yes, NLV74LCX245DTR2G uses the same TSSOP-20 pinout as MC74LCX245DTG and other 74LCX245 variants in TSSOP-20 packaging - including identical pin numbering, function mapping, and mechanical footprint. However, the NLV prefix denotes enhanced automotive qualification (AEC-Q100) and extended temperature support, not a pinout change. Board designs using MC74LCX245DTG can directly substitute NLV74LCX245DTR2G without layout modification.

What is the purpose of the IOFF specification in NLV74LCX245DTR2G?

IOFF ensures that all I/O pins enter a high-impedance state when VCC = 0 V - preventing current backflow, signal contention, or unintended powering of downstream circuits during power sequencing, hot-swap events, or partial system shutdown. This behavior is explicitly tested and guaranteed in the NLV74LCX245DTR2G datasheet, with leakage limited to 10 µA max, making it critical for fault-tolerant industrial and automotive architectures where power domains activate asynchronously.