Texas Instruments SN74LVTH240IPWREP

Overview

SN74LVTH240IPWREP from Texas Instruments is an octal buffer/line driver IC designed for 3.3-V V_CC operation with 5-V tolerant inputs and outputs, supporting mixed-mode signal interfacing between 3.3-V logic and legacy 5-V systems. It features dual 4-bit channels, independent output-enable (OE) controls, bus-hold circuitry on data inputs, I_off support for hot insertion, and operates across −40°C to 85°C in TSSOP-20 packaging.

For engineers reviewing the SN74LVTH240IPWREP datasheet, SN74LVTH240IPWREP pinout, SN74LVTH240IPWREP application, or SN74LVTH240IPWREP equivalent, key selection criteria include its 2.7–3.6-V supply range, 64-mA sink/output drive capability, <4.6-ns propagation delay at 3.3 V, bus-hold input retention, and enhanced reliability for industrial and defense-qualified embedded systems.

Technical Context

This device implements two independent 4-bit noninverting buffer/line driver sections, each with active-low output-enable control. Its TTL-compatible input thresholds (V_IL = 0.8 V, V_VIH = 2.0 V) and 5-V-tolerant I/O allow seamless interfacing with both 3.3-V and 5-V logic families without level-shifting components.

The integrated bus-hold circuitry actively maintains valid logic states on undriven or floating inputs-eliminating external pullup/pulldown resistors-while I_off and power-up 3-state functionality prevent backflow current and bus contention during hot-insertion or power sequencing events.

Key Specifications

Pinout & Package

TSSOP-20 (PW package), 0.65-mm pitch, 6.5-mm × 4.4-mm body, moisture sensitivity level 1 (260°C reflow compatible).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVTH240IPWREP, SN74LVT240PWRE lacks bus-hold and requires external biasing, while SN74LVCH240APWRE omits 5-V input tolerance-making SN74LVTH240IPWREP uniquely suitable for legacy interface bridging where input floating and voltage domain mixing are design constraints.

Availability

SN74LVTH240IPWREP is available at Aetrix Electronics and suitable for industrial backplane interfaces, military data bus buffering, avionics LRUs, and test equipment signal conditioning requiring stable component supply under extended temperature and enhanced reliability conditions.

Supply support for SN74LVTH240IPWREP 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 logic solutions, with decades of experience in high-reliability and aerospace-grade component development.

The SN74LVTH240IPWREP belongs to TI's enhanced-product (EP) logic family, engineered specifically for mission-critical applications demanding extended temperature operation, controlled manufacturing baselines, and JEDEC-qualified reliability across defense, avionics, and industrial infrastructure.

FAQ

What is the operating temperature range for SN74LVTH240IPWREP?

The SN74LVTH240IPWREP is rated for operation from −40°C to +85°C ambient temperature. This extended industrial temperature range is validated per JEDEC qualification standards-including temperature cycling, HAST, and autoclave testing-and supports deployment in harsh environments such as avionics, ground vehicles, and outdoor industrial control systems. The SN74LVTH240IPWREP maintains full electrical performance across this range without derating.

Does SN74LVTH240IPWREP support hot insertion?

Yes, SN74LVTH240IPWREP supports hot insertion via two complementary features: I_off circuitry that disables outputs and limits reverse current to ±100 µA when V_CC = 0, and power-up 3-state logic that forces outputs into high-impedance during power ramp-up/down. These features prevent bus contention and back-current damage in live backplane or modular chassis applications-verified per TI's enhanced product qualification protocol.

Can SN74LVTH240IPWREP interface directly with 5-V logic?

Yes, SN74LVTH240IPWREP accepts 5-V input signals while operating from a 3.3-V supply (V_CC = 2.7–3.6 V), and its outputs drive 5-V TTL loads with full 64-mA sink capability. Input voltage tolerance extends to 7 V, and output voltage swing reaches V_CC − 0.2 V (min) under load-enabling true mixed-mode interfacing without external level shifters. This capability is explicitly confirmed in the SCBS766 datasheet's "Mixed-Mode Signal Operation" section.

What is the purpose of bus-hold circuitry in SN74LVTH240IPWREP?

The bus-hold circuitry in SN74LVTH240IPWREP actively maintains the last-valid logic state on any undriven or floating data input (1A1–1A4, 2A1–2A4), eliminating the need for external pullup or pulldown resistors. With ±750 µA dynamic hold current at V_CC = 3.6 V, it ensures deterministic input levels during power-up, standby, or signal disconnection-reducing BOM cost, PCB space, and potential noise coupling from resistor networks. TI explicitly states "Use of pullup or pulldown resistors with the bus-hold circuitry is not recommended."

Is SN74LVTH240IPWREP pin-compatible with standard SN74LVTH240 variants?

Yes, SN74LVTH240IPWREP shares identical pinout, function mapping, and TSSOP-20 (PW) package dimensions with the commercial SN74LVTH240PWR and military SN54LVTH240, as confirmed by TI's package drawing SPAC039 and logic diagram in SCBS766. All variants use the same top-side marking layout (LH240EP), same terminal numbering, and identical OE/A/Y/GND/V_CC assignments-enabling drop-in replacement in existing layouts qualified for the LVTH240 family.