Texas Instruments SN74LVT240APWRE4

Overview

SN74LVT240APWRE4 from Texas Instruments is an octal buffer/line driver IC with dual 4-bit noninverting outputs, designed for 3.3-V V_CC operation while supporting 5-V TTL-level inputs and outputs. It features I_off and power-up 3-state for hot insertion, operates down to 2.7 V, and delivers t_PLH/t_PHL ≤ 3.8 ns at V_CC = 3.3 V - used in mixed-voltage bus interface and backplane driver applications.

For engineers reviewing the SN74LVT240APWRE4 datasheet, SN74LVT240APWRE4 pinout, SN74LVT240APWRE4 application, or SN74LVT240APWRE4 equivalent, key selection considerations include its 20-pin TSSOP package, 3.3-V supply with 5-V tolerant I/O, hot-plug capability via I_off, output ground bounce < 0.8 V, and compliance with JESD 78 Class II latch-up and JESD 22 ESD standards.

Technical Context

This device implements two independent 4-bit noninverting buffer sections, each with dedicated output-enable (OE) control. Each section passes A-input data to Y-outputs when OE is low; outputs enter high-impedance state when OE is high. The architecture supports mixed-mode signal translation between 3.3-V logic domains and legacy 5-V systems without level shifters.

Power sequencing is managed by built-in power-up 3-state circuitry that forces outputs into high-Z when V_CC is below 1.5 V, and I_off blocks current flow during power-down. Absolute maximum ratings include −0.5 V to 4.6 V V_CC, −0.5 V to 7 V input/output voltage range, and 64 mA per-output sink current capability.

Key Specifications

Pinout & Package

TSSOP-20 (PW) package: 4.4 mm × 6.5 mm body, 0.65 mm lead pitch, 1.2 mm max height, RoHS-compliant NiPdAu finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVTH240PWRE4 and SN74ALVCH16240DLR, the SN74LVT240APWRE4 uniquely combines 5-V I/O tolerance, hot-insertion support, and sub-4 ns propagation in a compact 20-pin TSSOP - making it the only option among the three qualified for mixed-voltage, hot-swap-critical designs.

Availability

SN74LVT240APWRE4 is available at Aetrix Electronics and suitable for industrial PLC backplanes, automated test equipment I/O modules, and communications baseband boards requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for SN74LVT240APWRE4 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies, with decades of experience in high-reliability logic and interface solutions.

The SN74LVT240APWRE4 belongs to TI's LVT (Low-Voltage BiCMOS Technology) logic family, engineered specifically for mixed-voltage system interfacing, hot-plug operation, and industrial-grade robustness in 3.3-V-centric designs.

FAQ

What is the recommended operating voltage range for SN74LVT240APWRE4?

The SN74LVT240APWRE4 is specified for V_CC between 2.7 V and 3.6 V. Operation within this range ensures compliance with all electrical characteristics including VOL, VOH, and timing parameters. Supply voltages below 2.7 V may cause undefined output states or increased propagation delay, while exceeding 3.6 V risks violating absolute maximum ratings and long-term reliability.

Does SN74LVT240APWRE4 support hot insertion, and how is it implemented?

Yes, SN74LVT240APWRE4 supports hot insertion via two integrated features: I_off circuitry disables outputs and limits reverse current to ±100 µA when V_CC = 0 V, and power-up 3-state holds outputs in high-impedance until V_CC exceeds 1.5 V. These functions prevent bus contention and backdrive damage during live board replacement - confirmed in the device's functional description and absolute maximum ratings table.

Can SN74LVT240APWRE4 interface directly with 5-V logic devices?

Yes, SN74LVT240APWRE4 accepts input voltages up to 5.5 V and tolerates output voltages up to 7 V in high-impedance or power-off states - enabling direct connection to 5-V TTL systems without external level shifters. Its VIH/VIL thresholds (2.0 V/0.8 V) and 5-V-compatible output swing ensure interoperability while powered from 3.3 V.

What is the maximum output drive capability of SN74LVT240APWRE4 per channel?

SN74LVT240APWRE4 provides 64 mA sink current (I_OL) and −32 mA source current (I_OH) per output at V_CC = 3.6 V. This drive strength supports driving multiple TTL loads or moderate PCB trace capacitance. Derating applies above 70°C ambient, and total package current must remain within thermal limits defined by θ_JA = 83°C/W for the PW package.

Is SN74LVT240APWRE4 pin-compatible with other members of the SN74LVT240x family?

Yes, SN74LVT240APWRE4 shares identical pinout and functionality with all variants in the SN74LVT240x family (e.g., SN74LVT240ADBR, SN74LVT240APWR), differing only in package type (TSSOP vs. SSOP vs. SOIC) and reel/tube packaging. The 20-pin TSSOP (PW) footprint matches TI's standardized layout for this logic function, enabling drop-in substitution across same-package variants.