PCA9518PWT Equivalent & Substitute Parts

Part Overview

The PCA9518PWT is a specialized interface buffer IC manufactured by Texas Instruments, designed for I2C communication applications. This 20-TSSOP surface mount device operates within a 3V to 3.6V supply voltage range and is classified as a Last Time Buy product, indicating discontinued production with limited inventory availability. The identification of equivalent substitute parts is necessary to ensure design continuity and long-term component sourcing for applications currently utilizing this part number.

Substiute Parts

PCA9518PWT

Texas InstrumentsIn Stock: 1701PCA9518PWT Datasheet

Current PartRFQ

PCA9518PWR

Texas InstrumentsIn Stock: 6115PCA9518PWR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PCA9518PWT is determined by the following critical parameters:

• Base Product Number: Both parts must share the PCA9518 base designation
• Package / Case: Identical 20-TSSOP form factor (0.173", 4.40mm Width)
• Mounting Type: Surface Mount compatibility
• Voltage - Supply Range: 3V ~ 3.6V operational specification
• Interface Protocol: I2C communication standard
• RoHS Compliance: ROHS3 Compliant status
• Moisture Sensitivity Level: MSL 1 (Unlimited)

The PCA9518PWR qualifies as a direct substitute based on matching all critical electrical and mechanical parameters required for functional equivalence in I2C buffer applications.

Parameter Comparison

Engineering Selection Recommendations

The PCA9518PWR is the designated manufacturer-recommended substitute for the PCA9518PWT. Selection between these parts should be based on product status and availability requirements:

PCA9518PWT is classified as Last Time Buy with 1646 units in stock. This status indicates production discontinuation with finite inventory. Use this part number only when existing design documentation or supply chain agreements specifically require it.

PCA9518PWR is classified as Active with 6100 units in stock. This part number represents the current production equivalent and is recommended for new designs, design revisions, and long-term supply chain planning. Both parts maintain identical electrical specifications, package geometry, and compliance certifications (ROHS3, REACH Unaffected, EAR99).

The PCA9518PWR provides extended interface support including SMBus protocol compatibility in addition to I2C, offering enhanced functionality within the same physical and electrical constraints.

Frequently Asked Questions (FAQ)

Q: Can PCA9518PWR be used as a direct replacement for PCA9518PWT in existing designs?

A: Yes. Both parts share identical package geometry (20-TSSOP), supply voltage range (3V ~ 3.6V), mounting type (Surface Mount), and compliance certifications. No PCB layout modifications or design changes are required for substitution.

Q: What is the difference between PCA9518PWT and PCA9518PWR?

A: The primary difference is product status. PCA9518PWT is Last Time Buy (discontinued), while PCA9518PWR is Active (current production). Electrically and mechanically, both parts are equivalent. PCA9518PWR additionally supports SMBus protocol alongside I2C.

Q: Why is PCA9518PWT classified as Last Time Buy?

A: Last Time Buy status indicates Texas Instruments has discontinued production of this specific part number variant. Existing inventory is available for a limited time. The PCA9518PWR serves as the active production replacement.

Q: Are there any compliance or certification differences between these parts?

A: No. Both parts maintain identical compliance status: ROHS3 Compliant, REACH Unaffected, EAR99 classification, and MSL 1 (Unlimited) moisture sensitivity rating.

Q: What is the packaging difference between PCA9518PWT and PCA9518PWR?

A: Both parts use identical packaging: 20-TSSOP (0.173", 4.40mm Width) in Tape & Reel format. No packaging differences exist between these part numbers.

Q: Is SMBus compatibility a functional requirement for substitution?

A: No. SMBus support in PCA9518PWR is an additional capability. If your application uses only I2C protocol, both parts function identically. SMBus compatibility does not affect I2C operation.