PCA9517DG4 Equivalent & Substitute Parts

Part Overview

The PCA9517DG4 is a Buffer/ReDriver interface IC designed for I2C applications with 2-channel 400kHz capability in an 8-SOIC package. Manufactured by Texas Instruments, this component is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design requirements and component procurement.

Substiute Parts

PCA9517DG4

Texas InstrumentsIn Stock: 1081PCA9517DG4 Datasheet

Current PartRFQ

TCA9517DR

Texas InstrumentsIn Stock: 3720TCA9517DR Datasheet

MFR RecommendedRFQ

PCA9508D,118

NXP USA Inc.In Stock: 2131PCA9508D,118 Datasheet

DirectRFQ

PCA9517AD,118

NXP USA Inc.In Stock: 2063PCA9517AD,118 Datasheet

DirectRFQ

PCA9517D,118

NXP USA Inc.In Stock: 6089PCA9517D,118 Datasheet

DirectRFQ

PCA9517D

Texas InstrumentsIn Stock: 1342PCA9517D Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PCA9517DG4 is determined by the following critical parameters:

Primary Substitution Criteria:

• Type: Buffer/ReDriver interface IC
• Applications: I2C protocol support
• Number of Channels: 2 channels
• Data Rate: 400kHz maximum
• Package: 8-SOIC form factor
• Operating Temperature Range: -40°C ~ 85°C
• Supply Voltage Compatibility: Overlapping voltage ranges

Substitution Logic: Parts meeting all primary criteria are classified as direct substitutes. The PCA9517D,118 (NXP), PCA9517AD,118 (NXP), and PCA9517D (Texas Instruments) satisfy these requirements. The PCA9508D,118 (NXP) functions as a single-channel alternative for applications requiring reduced channel count. The TCA9517DR (Texas Instruments) operates as a voltage level translator with bidirectional capability, suitable for applications requiring signal conditioning across different voltage domains.

Parameter Comparison

Engineering Selection Recommendations

Tier 1 - Direct Substitutes (Recommended for Pin-Compatible Replacement):

PCA9517D,118 and PCA9517AD,118 (NXP USA Inc.) are active production alternatives with identical channel count, data rate, and operating temperature specifications. Both maintain ROHS3 compliance and unlimited moisture sensitivity rating. Supply current increases to 5mA compared to the original 1.5mA specification. These parts are suitable for applications where the increased current draw is acceptable within system power budgets.

Tier 2 - Functional Alternative (Single-Channel Application):

PCA9508D,118 (NXP USA Inc.) provides single-channel I2C ReDriver functionality at 400kHz with the lowest supply current (1mA) and maintains full compliance certifications. This part is appropriate for designs requiring only one I2C channel or where channel reduction is feasible.

Tier 3 - Specialized Alternative (Voltage Translation Requirement):

TCA9517DR (Texas Instruments) functions as a bidirectional voltage level translator with active product status. This part is suitable for applications requiring signal conditioning between different voltage domains while maintaining I2C protocol compatibility. Selection of this part requires confirmation that voltage translation functionality aligns with system requirements.

Obsolete Part Consideration:

PCA9517D (Texas Instruments) carries obsolete status and should not be selected for new designs despite parameter compatibility with the original part.

Frequently Asked Questions (FAQ)

Q: Can PCA9517D,118 or PCA9517AD,118 directly replace PCA9517DG4 in existing designs?

A: Both NXP alternatives maintain identical channel count (2), data rate (400kHz), operating temperature range (-40°C ~ 85°C), and package form factor (8-SO/8-SOIC). The primary design consideration is increased supply current (5mA versus 1.5mA). Verify that system power budgets accommodate this increase before implementation.

Q: What is the difference between PCA9517D,118 and PCA9517AD,118?

A: Both parts are manufactured by NXP USA Inc. with identical electrical specifications. The primary difference is packaging: PCA9517D,118 is supplied in Tape & Reel format, while PCA9517AD,118 is supplied in Cut Tape & Digi-Reel format. Selection depends on procurement and assembly requirements.

Q: Is the TCA9517DR suitable as a direct replacement?

A: TCA9517DR is a voltage level translator rather than a ReDriver. While it provides 2-channel bidirectional capability and maintains I2C compatibility, its functional purpose differs from the original part. Use this part only when voltage translation between different supply domains is a system requirement.

Q: Why does PCA9508D,118 have only one channel?

A: PCA9508D,118 is designed for single-channel I2C hotswap applications. It is suitable for designs requiring only one I2C channel or where system architecture permits channel reduction. Supply current is reduced to 1mA, providing power efficiency benefits.

Q: Are all substitute parts ROHS3 compliant?

A: All listed substitute parts maintain ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1), matching the original PCA9517DG4 specifications.

Q: Should I use the obsolete PCA9517D from Texas Instruments?

A: No. The PCA9517D carries obsolete product status and should not be selected for new designs. Active alternatives (PCA9517D,118 or PCA9517AD,118 from NXP) are available and recommended.