SN74HCT240APWR Equivalent & Substitute Parts

Part Overview

The SN74HCT240APWR is an inverting buffer logic integrated circuit manufactured by Texas Instruments. This device functions as a 2-element, 4-bit-per-element buffer with 3-state output capability, designed for signal buffering and inversion applications in digital logic circuits. The part is currently in active production status. Substitute parts may be required due to inventory constraints, packaging preferences, or supply chain considerations while maintaining identical electrical and mechanical specifications.

Substiute Parts

SN74HCT240APWR

Texas InstrumentsIn Stock: 3921SN74HCT240APWR Datasheet

Current PartRFQ

SN74HCT240PWT

Texas InstrumentsIn Stock: 1408SN74HCT240PWT Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74HCT240APWR is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Requirements:

• 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 capability)
• Current - Output High, Low: 6mA, 6mA (identical drive capability)
• Voltage - Supply: 4.5V ~ 5.5V (identical supply range)
• Operating Temperature Range: -40°C ~ 85°C (identical thermal specification)

Mechanical Equivalence Requirements:

• Package / Case: 20-TSSOP (identical physical form factor)
• Mounting Type: Surface Mount (identical assembly method)

Compliance Equivalence Requirements:

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

The substitute part SN74HCT240PWT meets all electrical, mechanical, and compliance parameters specified above. Substitution is valid only when all parameters remain unchanged.

Parameter Comparison

Engineering Selection Recommendations

SN74HCT240APWR (Main Part):

• Current product status: Active
• Recommended for new designs and ongoing production
• Packaging format: Prototype configuration
• Inventory availability: 3862 pieces in stock

SN74HCT240PWT (Substitute Part):

• Product status: Discontinued at DiGi Electronics
• Electrical and mechanical specifications: Fully equivalent to main part
• Packaging format: Tape & Reel (TR) configuration
• Inventory availability: 1309 pieces in stock
• Compliance: ROHS3 Compliant, REACH Unaffected

Selection between these parts should be based on packaging requirements and availability. The SN74HCT240APWR is the preferred choice for active production due to its active product status. The SN74HCT240PWT remains electrically and mechanically equivalent and may be used as a substitute when packaging format (Tape & Reel) is acceptable and inventory of the primary part is unavailable.

Frequently Asked Questions (FAQ)

Q: Can SN74HCT240PWT be used as a direct replacement for SN74HCT240APWR?

A: Yes. Both parts are electrically and mechanically equivalent. They share identical logic type, element configuration, bit width, output type, drive current, supply voltage range, operating temperature range, package form factor, and mounting type. The primary difference is packaging format (Tape & Reel versus Prototype) and product status.

Q: What is the difference between the packaging formats?

A: SN74HCT240APWR is supplied in Prototype packaging format. SN74HCT240PWT is supplied in Tape & Reel (TR) format, which is standard for high-volume production assembly. Both formats contain the identical die and lead configuration in the 20-TSSOP package.

Q: Are there any compliance differences between these parts?

A: No. Both parts are ROHS3 Compliant with Moisture Sensitivity Level 1 (Unlimited). The SN74HCT240PWT carries additional certifications: REACH Unaffected status and ECCN EAR99 classification.

Q: Why is SN74HCT240PWT discontinued at DiGi Electronics?

A: Product discontinuation at a specific distributor does not indicate end-of-life status from the manufacturer. Availability should be verified through current inventory channels.

Q: What parameters must remain identical for substitution to be valid?

A: All of the following parameters must match: Logic Type (Buffer, Inverting), Number of Elements (2), Number of Bits per Element (4), Output Type (3-State), Current ratings (6mA, 6mA), Supply Voltage (4.5V ~ 5.5V), Operating Temperature (-40°C ~ 85°C), Package/Case (20-TSSOP), and Mounting Type (Surface Mount).

Q: Can this part be used in applications requiring different supply voltages?

A: No. The SN74HCT240APWR and SN74HCT240PWT are specified for 4.5V to 5.5V supply voltage only. Operation outside this range is not supported.

Q: What is the significance of the 3-State output type?

A: 3-State output capability means the output can assume three states: logic high, logic low, or high-impedance (disabled). This allows multiple devices to share a common bus without contention when properly controlled.