Texas Instruments SN74LV240ADWR

Overview

SN74LV240ADWR 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 with 5.5-V-tolerant inputs. It is used in memory address buffering, bus transceivers, and clock distribution in industrial and communications systems.

For engineers reviewing the SN74LV240ADWR datasheet, SN74LV240ADWR pinout, SN74LV240ADWR application, or SN74LV240ADWR equivalent, this page provides verified functional mode behavior, SOIC-20 package details, 3-state timing specs, I_off live-insertion capability, and validated alternative options for bus interface redesigns.

Technical Context

The SN74LV240ADWR implements two independent 4-bit inverting buffers, each with dedicated active-low output-enable (OE) control. Its CMOS design enables rail-to-rail output swing, 5.5-V input tolerance across all ports, and I_off protection that disables current flow when V_CC = 0 V - critical for hot-swap and partial power-down systems.

It operates across –40°C to +125°C with guaranteed switching performance at 2.5 V, 3.3 V, and 5 V supply levels. Propagation delay (t_pd) is specified down to 3.4 ns (min) at 5 V/15 pF, while enable/disable timing (t_en/t_dis) remains under 8.5 ns (max) at 5 V - enabling high-speed bus arbitration and dynamic load isolation.

Key Specifications

Pinout & Package

SN74LV240ADWR uses a 20-pin SOIC (DW) package measuring 12.80 mm × 10.3 mm (body: 12.80 mm × 7.50 mm), with standard 0.050″ lead pitch and gull-wing leads compatible with IPC-7351B SOIC-20 footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LV240ADWR, SN74LVC240APW offers better speed at lower voltages but sacrifices 5 V interface capability, while 74LVX240M matches voltage range but lacks modern reliability features and supply chain availability - making SN74LV240ADWR the optimal choice for mixed-voltage, hot-swap-capable industrial designs.

Availability

SN74LV240ADWR is available at Aetrix Electronics and suitable for memory address buffering, industrial bus transceivers, and smartphone baseband interface applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74LV240ADWR 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 industrial, automotive, and communications markets.

The SN74LV240A product line targets high-density, low-power bus interface applications - specifically engineered to replace TTL and older CMOS buffers in memory subsystems, clock trees, and control-plane signal routing where 3-state isolation and voltage translation are critical.

FAQ

What is the maximum output drive capability of the SN74LV240ADWR at 3.3 V?

The SN74LV240ADWR delivers ±8 mA output current at V_CC = 3.3 V, as specified in Section 5.3 of the datasheet. This drive strength supports fan-out to four LVTTL inputs or termination of short PCB traces without external buffering. The value is measured under recommended operating conditions with I_OL = 8 mA (low-level) and I_OH = –8 mA (high-level), ensuring reliable signal integrity in real-world industrial bus implementations using SN74LV240ADWR.

Does the SN74LV240ADWR support hot-swap or live-insertion applications?

Yes, the SN74LV240ADWR 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 powered circuitry during card insertion and eliminates latch-up risk per JESD17. The specification is validated across –40°C to +125°C and applies directly to SN74LV240ADWR in SOIC-20 packaging, making it suitable for modular backplane systems where SN74LV240ADWR manages dynamic bus isolation.

Can the SN74LV240ADWR interface between 5 V and 3.3 V logic domains?

Yes, the SN74LV240ADWR accepts input voltages up to 5.5 V regardless of V_CC level - enabling direct connection to 5 V controllers while operating at 3.3 V or 2.5 V. Its output swing remains rail-to-rail (0 V to V_CC), so SN74LV240ADWR outputs are compatible with downstream 3.3 V receivers. This dual-voltage capability eliminates external level shifters in mixed-domain systems using SN74LV240ADWR.

What is the propagation delay of the SN74LV240ADWR at 5 V supply?

The maximum propagation delay (t_pd) of the SN74LV240ADWR is 6.5 ns at V_CC = 5 V ±0.5 V and C_L = 15 pF, as confirmed in Section 5.8 of the datasheet. This value represents worst-case delay from input transition to valid output transition under standard test conditions. Engineers designing high-speed memory or clock distribution paths must account for this timing when calculating setup/hold margins for SN74LV240ADWR-based interfaces.

Is the SN74LV240ADWR pin-compatible with other members of the 'LV240A family?

Yes, all 'LV240A variants - including SN74LV240ADBR (SSOP), SN74LV240ADGVR (TVSOP), and SN74LV240ADWR (SOIC) - share identical pin functions and logic behavior per Table 4-1 and Figure 4-1. The SN74LV240ADWR uses Pin 1 = 1OE, Pins 2–9 = 1A1–1Y4, Pin 10 = GND, Pins 11–19 = 2A1–2OE, and Pin 20 = V_CC. This uniformity allows drop-in replacement across packages when board layout permits, provided thermal and routing constraints are met for SN74LV240ADWR.