Texas Instruments SN74LV240APWG4

Overview

SN74LV240APWG4 from Texas Instruments is an octal inverting buffer/driver with 3-state outputs, designed for 2V–5.5V V_CC operation. It delivers 16 mA output drive at 5 V, achieves 6.5 ns max propagation delay at 5 V, and supports mixed-mode voltage translation - enabling 5.5 V-tolerant inputs while operating at 3.3 V or 2.5 V. It is used in bus interface circuits for memory address driving, clock distribution, and data line isolation in compact portable electronics.

For engineers reviewing the SN74LV240APWG4 datasheet, SN74LV240APWG4 pinout, SN74LV240APWG4 application, or SN74LV240APWG4 equivalent, key selection considerations include its dual 4-bit 3-state architecture with independent OE controls, I_off support for live insertion, ground-bounce performance (<0.8 V at 3.3 V), and TSSOP-20 packaging suitable for high-density PCB layouts.

Technical Context

The SN74LV240APWG4 implements two independent 4-bit inverting buffer sections, each with dedicated output-enable (OE) inputs - enabling selective tri-state control of Y1–Y4 and Y1'–Y4' groups. Its CMOS design ensures rail-to-rail output swing, low static current (20 µA max), and input leakage <±1 µA across temperature.

It features true 5.5 V-tolerant inputs regardless of V_CC level, allowing down-translation from higher-voltage logic domains into 3.3 V or 2.5 V systems. The I_off specification guarantees <5 µA power-off leakage when V_CC = 0 V, supporting hot-swap and partial power-down modes without back-drive risk.

Key Specifications

Pinout & Package

TSSOP-20 package (PW), body size 6.50 mm × 4.40 mm, 0.65 mm pitch, lead-free NiPdAu finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC240APWR and 74AHC240PW, the SN74LV240APWG4 uniquely balances 5.5 V input tolerance, I_off-enabled hot-swap safety, and industrial temperature range - making it optimal for mixed-voltage embedded systems requiring reliability over raw speed or ultra-low voltage operation.

Availability

SN74LV240APWG4 is available at Aetrix Electronics and suitable for industrial automation interfaces, wearable sensor hubs, and smartphone peripheral interconnects requiring stable component supply across extended temperature and mixed-voltage conditions.

Supply support for SN74LV240APWG4 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 leadership in logic IC design and manufacturing.

The SN74LV240APWG4 belongs to TI's LV-A family of low-voltage, high-noise-immunity logic devices - engineered specifically for reliable 3-state bus interfacing in space-constrained, mixed-supply industrial and portable electronics.

FAQ

What is the maximum output drive capability of the SN74LV240APWG4 at 3.3 V?

The SN74LV240APWG4 provides ±8 mA output drive at V_CC = 3 V, per output, as specified in Section 5.3 of the datasheet. This allows reliable interfacing with multiple CMOS loads or single LVTTL receivers while maintaining VOL ≤ 0.44 V and VOH ≥ 2.48 V - ensuring noise margins exceed 0.6 V in typical 3.3 V systems. The SN74LV240APWG4 maintains this performance across –40°C to +125°C.

Does the SN74LV240APWG4 support hot-swap or live insertion?

Yes, the SN74LV240APWG4 supports live insertion via its I_off feature, which limits input/output leakage to <5 µA when V_CC = 0 V. This prevents back-driving of powered circuitry during board insertion or removal. The SN74LV240APWG4 also meets JESD17 latch-up immunity (>250 mA), further enhancing robustness in hot-swap applications like modular PLC I/O cards.

Can the SN74LV240APWG4 interface 5 V signals with a 2.5 V microcontroller?

Yes - the SN74LV240APWG4 accepts input voltages up to 5.5 V regardless of V_CC, enabling direct connection of 5 V peripherals to a 2.5 V-powered host. When V_CC = 2.5 V, the SN74LV240APWG4 outputs swing rail-to-rail (0 V to 2.5 V), preserving logic thresholds for downstream 2.5 V receivers. Input thresholds scale with V_CC, ensuring compatibility across the full 2–5.5 V range.

What is the thermal resistance (RθJA) of the SN74LV240APWG4 in its TSSOP-20 package?

The SN74LV240APWG4 in the PW (TSSOP-20) package has a junction-to-ambient thermal resistance (RθJA) of 128.2°C/W, per Section 5.4 of the datasheet. This value assumes standard JEDEC 2-layer board conditions. For sustained operation at 125°C ambient, total power dissipation should remain below ~39 mW - achievable given its 20 µA max ICC and low C_pd (14 pF at 3.3 V).

How does the SN74LV240APWG4 differ from the non-G4 suffix variant?

The "G4" suffix in SN74LV240APWG4 denotes TI's green packaging standard: lead-free, RoHS-compliant, NiPdAu terminal finish, and MSL Level-1 rating. Electrically and functionally identical to SN74LV240APWR, the SN74LV240APWG4 meets modern environmental compliance requirements without altering timing, drive, or voltage specifications - making it drop-in compatible in new designs requiring green certification.