SN74ALS240ADB Equivalent & Substitute Parts

Part Overview

The SN74ALS240ADB is an active-status logic buffer integrated circuit manufactured by Texas Instruments. This device functions as an inverting buffer with 2 elements, each containing 4 bits, and features 3-state output capability. The component is designed for digital logic applications requiring signal buffering and inversion with tri-state control.

The SN74ALS240ADB is supplied in Surface Mount packaging (20-SSOP) and is ROHS3 compliant with MSL Level 1 rating. Finding equivalent substitute parts is necessary when the primary packaging format (tube or cut tape) is unavailable, when alternative inventory sources are required, or when design flexibility in procurement is needed while maintaining identical electrical and mechanical specifications.

Substiute Parts

SN74ALS240ADB

Texas InstrumentsIn Stock: 1101SN74ALS240ADB Datasheet

Current PartRFQ

SN74ALS240ADBR

Texas InstrumentsIn Stock: 3304SN74ALS240ADBR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SN74ALS240ADB are determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

• Logic Type: Buffer, Inverting (identical function)
• Number of Elements: 2 (identical configuration)
• Number of Bits per Element: 4 (identical bit width)
• Output Type: 3-State (identical output control)
• Current - Output High, Low: 15mA, 24mA (identical drive capability)
• Voltage - Supply: 4.5V ~ 5.5V (identical supply range)
• Operating Temperature: 0°C ~ 70°C (identical thermal range)

Mechanical Equivalence Criteria:

• Mounting Type: Surface Mount (identical assembly method)
• Package / Case: 20-SSOP (identical physical footprint and pinout)
• Series: 74ALS (identical logic family)

Compliance Equivalence Criteria:

• RoHS Status: ROHS3 Compliant (identical environmental compliance)
• Moisture Sensitivity Level: 1 (identical handling requirements)

The only permitted variation is packaging format (tube/cut tape versus Tape & Reel), which does not affect electrical performance or mechanical compatibility on the PCB.

Parameter Comparison

Engineering Selection Recommendations

The SN74ALS240ADBR is a direct parametric equivalent to the SN74ALS240ADB. Both components are manufactured by Texas Instruments, carry Active product status, and maintain identical electrical specifications, thermal operating range, and mechanical footprint.

Selection Basis:

The SN74ALS240ADBR differs only in packaging format (Tape & Reel versus tube/cut tape). This variation affects procurement and assembly logistics but does not impact circuit performance, PCB layout, or functional compatibility.

Compliance Status:

Both parts are ROHS3 compliant and carry MSL Level 1 rating, indicating unlimited shelf life under standard storage conditions. Both maintain identical supply voltage tolerance (4.5V ~ 5.5V) and output drive capability (15mA high, 24mA low).

Inventory Consideration:

The SN74ALS240ADBR currently maintains higher inventory availability (3200 Pcs) compared to the SN74ALS240ADB (1075 Pcs), making it suitable for high-volume production requirements or extended lead-time mitigation strategies.

Frequently Asked Questions (FAQ)

Q: Can the SN74ALS240ADBR be used as a direct replacement for the SN74ALS240ADB on a PCB?

A: Yes. Both components share identical electrical specifications, pinout, and 20-SSOP package dimensions. The physical footprint and solder pad layout are identical, permitting direct substitution without PCB redesign.

Q: What is the difference between the two part numbers?

A: The suffix "R" in SN74ALS240ADBR indicates Tape & Reel packaging format, while SN74ALS240ADB is supplied in tube or cut tape format. The electrical and mechanical specifications are identical.

Q: Are there any thermal or voltage differences between these parts?

A: No. Both components operate across the identical supply voltage range (4.5V ~ 5.5V) and temperature range (0°C ~ 70°C). Output drive currents (15mA high, 24mA low) are identical.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the SN74ALS240ADB and SN74ALS240ADBR are ROHS3 compliant with MSL Level 1 rating. Compliance certifications are equivalent.

Q: Which part should be selected for high-volume production?

A: The SN74ALS240ADBR (Tape & Reel format) is optimized for automated assembly processes and high-volume production due to its packaging format and current inventory availability.

Q: Can these parts be mixed in the same production batch?

A: Yes. Since both parts are electrically and mechanically identical, they can be used interchangeably within the same design and production run without functional impact.