SN74HCT245APW Equivalent & Substitute Parts

Part Overview

The SN74HCT245APW is a non-inverting transceiver logic integrated circuit manufactured by Texas Instruments, classified within the 74HCT series. This device functions as a single-element, 8-bit transceiver with 3-state output capability, housed in a 20-TSSOP surface mount package. The part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives that maintain identical electrical and mechanical specifications for direct component substitution in existing designs.

Substiute Parts

SN74HCT245APW

Texas InstrumentsIn Stock: 1017SN74HCT245APW Datasheet

Current PartRFQ

SN74HCT245PWT

Texas InstrumentsIn Stock: 1013SN74HCT245PWT Datasheet

Parametric EquivalentRFQ

SN74HCT245PW

Texas InstrumentsIn Stock: 2101SN74HCT245PW Datasheet

Parametric EquivalentRFQ

SN74HCT645PW

Texas InstrumentsIn Stock: 1396SN74HCT645PW Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74HCT245APW is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

• Logic Type: Transceiver, Non-Inverting (identical function)
• Number of Elements: 1 (single transceiver element)
• Number of Bits per Element: 8 (8-bit data width)
• Output Type: 3-State (tri-state output capability)
• Current - Output High, Low: 6mA, 6mA (identical drive capability)
• Voltage - Supply: 4.5V ~ 5.5V (identical supply range)
• Operating Temperature: -40°C ~ 85°C (identical thermal range)

Mechanical Equivalence Criteria:

• Mounting Type: Surface Mount (identical mounting method)
• Package / Case: 20-TSSOP (identical physical package)
• Supplier Device Package: 20-TSSOP (identical footprint)

Compliance Equivalence Criteria:

• RoHS Status: ROHS3 Compliant (identical regulatory compliance)

All substitute parts listed maintain 100% parametric equivalence across these criteria, enabling direct pin-for-pin and functional replacement without circuit modification.

Parameter Comparison

Engineering Selection Recommendations

SN74HCT245PW (Recommended Primary Substitute)

The SN74HCT245PW is the optimal substitute for the SN74HCT245APW. This part maintains complete parametric equivalence across all electrical and mechanical specifications. Although discontinued at DiGi Electronics, it maintains higher inventory availability (2000 units) compared to the original part (921 units). Packaging format is Tube, suitable for standard component handling and assembly processes. RoHS3 compliance and MSL rating of 1 (Unlimited) ensure compatibility with modern manufacturing standards.

SN74HCT245PWT (Secondary Substitute)

The SN74HCT245PWT provides full parametric equivalence with identical electrical performance and 20-TSSOP package specifications. This variant is supplied in Tape & Reel (TR) format, appropriate for high-volume automated assembly operations. Current product status is Obsolete; however, inventory availability (937 units) supports near-term procurement. MSL rating of 1 (Unlimited) and ROHS3 compliance maintain regulatory alignment.

SN74HCT645PW (Tertiary Substitute)

The SN74HCT645PW is a parametrically equivalent alternative with identical electrical specifications and 20-TSSOP package configuration. This part holds Active product status, indicating ongoing manufacturer support and long-term availability. Inventory level of 1344 units supports sustained procurement. Tube packaging format and ROHS3 compliance align with standard manufacturing requirements. The Active status makes this part suitable for new design implementations requiring long-term component availability assurance.

Selection Criteria Summary:

• For immediate replacement in existing inventory: SN74HCT245PW or SN74HCT245PWT
• For new designs requiring long-term availability: SN74HCT645PW (Active status)
• For high-volume automated assembly: SN74HCT245PWT (Tape & Reel format)
• For standard manual assembly: SN74HCT245PW (Tube format)

All three substitutes are electrically and mechanically interchangeable with the SN74HCT245APW without circuit modification or design changes.

Frequently Asked Questions (FAQ)

Q: Can SN74HCT245PW be used as a direct replacement for SN74HCT245APW?

A: Yes. The SN74HCT245PW is a direct pin-for-pin and functional equivalent. All electrical parameters (supply voltage, output current, operating temperature range) and mechanical specifications (20-TSSOP package, surface mount) are identical. No circuit modifications are required.

Q: What is the difference between SN74HCT245PW and SN74HCT245PWT?

A: Both parts are electrically and mechanically identical. The primary difference is packaging format: SN74HCT245PW is supplied in Tube format, while SN74HCT245PWT is supplied in Tape & Reel (TR) format. Selection depends on assembly process requirements. Tube format is suitable for manual or small-batch assembly; Tape & Reel format is optimized for automated high-volume production.

Q: Why is SN74HCT645PW listed as a substitute if it has a different base product number?

A: Although the base product numbers differ (74HCT245 versus 74HCT645), both parts are functionally equivalent non-inverting transceivers with identical electrical specifications and 20-TSSOP packaging. The different base numbers reflect internal design variations that do not affect pin compatibility or electrical performance in this application. Both are valid substitutes.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts (SN74HCT245PW, SN74HCT245PWT, SN74HCT645PW) maintain ROHS3 compliance, ensuring compatibility with modern manufacturing standards and regulatory requirements.

Q: What is the significance of the "Active" product status for SN74HCT645PW?

A: Active status indicates that Texas Instruments continues to manufacture and support this part. This status provides assurance of long-term availability and ongoing supply chain support, making SN74HCT645PW suitable for new design implementations where sustained component availability is a requirement.

Q: Can these parts be used interchangeably in existing PCB designs?

A: Yes. All substitute parts share identical 20-TSSOP package specifications and pin configurations. They can be used interchangeably in existing PCB designs without footprint modifications or design changes. Verify that your PCB assembly process accommodates the selected packaging format (Tube or Tape & Reel).

Q: What is the Moisture Sensitivity Level (MSL) rating, and why does it matter?

A: All substitute parts carry an MSL rating of 1 (Unlimited), indicating unlimited shelf life without moisture exposure precautions. This simplifies inventory management and reduces handling requirements compared to higher MSL ratings.

Q: Are there any electrical performance differences between the substitute parts?

A: No. All substitute parts maintain identical electrical specifications: 6mA output current (high and low), 4.5V to 5.5V supply voltage range, and -40°C to 85°C operating temperature range. Electrical performance is equivalent across all listed substitutes.