Texas Instruments SN74LV240APWRG4

Overview

SN74LV240APWRG4 from Texas Instruments is an octal inverting buffer/driver with 3-state outputs, designed for 2V–5.5V V_CC operation. It provides inverted signal buffering for memory address, clock, and bus applications, delivering up to 16 mA output drive at 5 V, 8 mA at 3.3 V, and features I_off support for live insertion and partial power-down mode.

For engineers reviewing the SN74LV240APWRG4 datasheet, SN74LV240APWRG4 pinout, SN74LV240APWRG4 application, or SN74LV240APWRG4 equivalent, key selection considerations include its 20-pin TSSOP (PW) package, 3.3-V/5-V mixed-mode voltage compatibility, 6.5 ns max propagation delay at 5 V, 5.5-V tolerant inputs, and high-impedance output control via dual independent OE pins.

Technical Context

The SN74LV240APWRG4 implements two independent 4-bit inverting buffer sections, each with dedicated output-enable (OE) control - 1OE controls Y1–Y4 outputs, 2OE controls Y1'–Y4' (labeled 1Y1–1Y4 in pin table). Its CMOS design enables rail-to-rail output swing and supports down-translation: inputs tolerate up to 5.5 V regardless of V_CC, enabling interfacing between higher-voltage logic and lower-voltage buses.

It operates across –40°C to +125°C, meets JESD17 latch-up >250 mA, and incorporates I_off circuitry that disables input/output leakage when V_CC = 0 V - critical for hot-swap and back-drive protection in powered-backplane systems. Ground bounce (V_OLP) and undershoot (V_OHV) are characterized at <0.8 V and >2.3 V respectively under 3.3-V operation.

Key Specifications

Pinout & Package

TSSOP-20 (PW) package: 6.50 mm × 6.40 mm body size, 20-pin surface-mount, lead-free (NIPDAU), moisture sensitivity level 1 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC240APWR and 74AHC240PW,118, the SN74LV240APWRG4 uniquely combines 5.5-V input tolerance, I_off protection, and industrial temperature range - making it the only option among the three qualified for mixed-voltage hot-swap bus interfaces in ruggedized equipment.

Availability

SN74LV240APWRG4 is available at Aetrix Electronics and suitable for industrial bus interface, smartphone baseband timing, and network switch control plane applications requiring stable component supply across extended temperature and mixed-voltage conditions.

Supply support for SN74LV240APWRG4 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 over 90 years of innovation in high-reliability, industry-standard components.

The SN74LV240APWRG4 belongs to TI's LV family of low-voltage logic devices, engineered for robust performance in mixed-voltage digital systems - particularly targeting memory, clock, and bus interface applications demanding voltage translation, 3-state control, and hot-swap resilience.

FAQ

What is the maximum operating voltage for SN74LV240APWRG4 inputs?

The SN74LV240APWRG4 inputs are rated for 0 V to 5.5 V regardless of V_CC level - this 5.5-V tolerance enables direct interfacing with 5-V logic while operating from 2.5-V or 3.3-V supplies. This specification is explicitly confirmed in Section 5.3 (Recommended Operating Conditions) and Section 7.3 (Feature Description) of the official TI datasheet SCLS384K.

Does SN74LV240APWRG4 support independent control of its two 4-bit sections?

Yes, SN74LV240APWRG4 provides fully independent control via two separate active-low output-enable inputs: 1OE controls outputs Y1–Y4 (inverted from A1–A4), and 2OE controls outputs 1Y1–1Y4 (inverted from 2A1–2A4). This dual-OE architecture is documented in the functional description (Section 7.1), pin table (Table 4-1), and function table (Table 7-1) of the SN74LV240APWRG4 datasheet.

What is the propagation delay of SN74LV240APWRG4 at 3.3 V supply?

At V_CC = 3.3 V ±0.3 V and C_L = 15 pF, the SN74LV240APWRG4 exhibits a typical propagation delay (t_pd) of 4.6 ns and a maximum of 7.5 ns (Section 5.7, Switching Characteristics). This value applies specifically to the A→Y path and is measured under standard load and temperature conditions (T_A = 25°C).

Is SN74LV240APWRG4 suitable for hot-swap applications?

Yes, SN74LV240APWRG4 supports hot-swap via its I_off feature, which limits input/output leakage to <5 µA when V_CC = 0 V (Section 5.5, Electrical Characteristics). This behavior is validated per JESD78 and enables safe insertion into powered backplanes - a key requirement explicitly cited in the device description (Section 3) and feature list (Section 1).

What package type is used for SN74LV240APWRG4?

SN74LV240APWRG4 uses the TSSOP-20 (PW) package: 6.50 mm × 6.40 mm body size, 20-pin surface-mount, lead-free (NIPDAU), and moisture sensitivity level 1 (260°C peak reflow). This is confirmed in the Package Information table (page 3), Mechanical Information section (page 16), and Package Option Addendum (page 1) of the official TI datasheet.