PCA9515AD I2C ReDriver Buffer Equivalent & Substitute Parts

Part Overview

The PCA9515AD is a 2-channel I2C ReDriver buffer manufactured by Texas Instruments, designed for 400kHz I2C bus applications. This interface IC operates across a 2.3V to 3.6V supply range and is housed in an 8-SOIC package. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design considerations. Substitute parts maintain functional compatibility while offering alternative packaging options, manufacturers, and product statuses.

Key Parameters

Parameter	Value
Part Number	PCA9515AD
Manufacturer	Texas Instruments
Type	Buffer, ReDriver
Applications	I2C
Number of Channels	2
Data Rate (Max)	400kHz
Input/Output	2-Wire Bus
Voltage - Supply	2.3V ~ 3.6V
Current - Supply	500µA
Operating Temperature	-40°C ~ 85°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the PCA9515AD is determined by the following critical parameters:

Data Rate Compatibility: All substitutes must support 400kHz I2C operation
Channel Configuration: 2-channel architecture is mandatory
Bus Interface: 2-Wire Bus input and output required
Supply Voltage Range: Must operate within or encompass the 2.3V to 3.6V range
Package Compatibility: Physical form factor determines PCB integration feasibility
Operating Temperature Range: Extended temperature support (-40°C to 85°C) preferred for industrial applications

Substitute parts are grouped into two categories:

Category 1: Texas Instruments PCA9515 Series — Direct manufacturer alternatives with identical base product number, varying in packaging format and product status.

Category 2: Analog Devices LTC4301 Series — Cross-manufacturer alternatives with enhanced specifications (wider supply voltage range 2.7V to 5.5V, higher current consumption 4.5mA, I2C Hotswap capability). These parts maintain core 2-channel, 400kHz I2C functionality but introduce additional features and operational differences.

Parameter Comparison

Part Number	Manufacturer	Channels	Data Rate	Supply Voltage	Supply Current	Temp Range	Package	Product Status
PCA9515AD	Texas Instruments	2	400kHz	2.3V ~ 3.6V	500µA	-40°C ~ 85°C	8-SOIC	Obsolete
PCA9515ADR	Texas Instruments	2	400kHz	2.3V ~ 3.6V	500µA	-40°C ~ 85°C	8-SOIC	Not For New Designs
PCA9515BDGKR	Texas Instruments	2	400kHz	2.3V ~ 3.6V	500µA	-40°C ~ 85°C	8-VSSOP	Active
PCA9515AD,118	NXP USA Inc.	2	400kHz	2.3V ~ 3.6V	800µA	-40°C ~ 85°C	8-SOIC	Active
LTC4301CDD#PBF	Analog Devices Inc.	2	400kHz	2.7V ~ 5.5V	4.5mA	0°C ~ 70°C	8-DFN (3x3)	Active
LTC4301CDD#TRPBF	Analog Devices Inc.	2	400kHz	2.7V ~ 5.5V	4.5mA	0°C ~ 70°C	8-DFN (3x3)	Active
LTC4301CMS8#PBF	Analog Devices Inc.	2	400kHz	2.7V ~ 5.5V	4.5mA	0°C ~ 70°C	8-MSOP	Active
LTC4301CMS8#TRPBF	Analog Devices Inc.	2	400kHz	2.7V ~ 5.5V	4.5mA	0°C ~ 70°C	8-MSOP	Active
LTC4301IDD#PBF	Analog Devices Inc.	2	400kHz	2.7V ~ 5.5V	4.5mA	-40°C ~ 85°C	8-DFN (3x3)	Active
LTC4301IDD#TRPBF	Analog Devices Inc.	2	400kHz	2.7V ~ 5.5V	4.5mA	-40°C ~ 85°C	8-DFN (3x3)	Active
LTC4301IMS8#PBF	Analog Devices Inc.	2	400kHz	2.7V ~ 5.5V	4.5mA	-40°C ~ 85°C	8-MSOP	Active

Engineering Selection Recommendations

For Direct Replacement (Same Electrical Characteristics):

PCA9515ADR and PCA9515BDGKR are Texas Instruments parts maintaining identical electrical specifications to the PCA9515AD. PCA9515ADR is classified as "Not For New Designs" but remains functionally equivalent. PCA9515BDGKR carries Active product status and is suitable for new designs, though it uses an 8-VSSOP package instead of 8-SOIC, requiring PCB layout modification.

For Active Product Status with Identical Package:

PCA9515AD,118 from NXP USA Inc. maintains the 8-SOIC package and Active product status. Supply current is specified at 800µA compared to 500µA for the original part, representing a 60% increase in power consumption. This part is suitable for applications where the higher current draw is acceptable.

For Extended Supply Voltage Range:

The Analog Devices LTC4301 series (all variants) operates across 2.7V to 5.5V, providing wider supply voltage compatibility. These parts are classified as Active and ROHS3 compliant. The LTC4301I variants support the extended temperature range (-40°C to 85°C) matching the original part. Supply current is significantly higher at 4.5mA. Package options include 8-DFN (3x3) and 8-MSOP formats. Tape & Reel packaging variants (#TRPBF) are available for high-volume applications.

Compliance Considerations:

All substitute parts maintain ROHS3 compliance, Moisture Sensitivity Level 1 (Unlimited), and REACH Unaffected status, matching the original part's regulatory standing.

Frequently Asked Questions (FAQ)

Q: Can PCA9515BDGKR replace PCA9515AD directly on the PCB?

A: Electrically, yes. The PCA9515BDGKR maintains identical electrical specifications. However, the package differs: PCA9515AD uses 8-SOIC while PCA9515BDGKR uses 8-VSSOP. PCB footprint modification is required.

Q: What is the primary difference between Texas Instruments PCA9515 variants and Analog Devices LTC4301 variants?

A: The LTC4301 series operates across a wider supply voltage range (2.7V to 5.5V versus 2.3V to 3.6V) and includes I2C Hotswap capability. Supply current consumption is significantly higher at 4.5mA. The LTC4301 is suitable for systems requiring extended voltage tolerance or hotswap functionality.

Q: Which substitute part is recommended for new designs?

A: PCA9515BDGKR (Texas Instruments, Active status) or any LTC4301I variant (Analog Devices, Active status, extended temperature range). Both are actively manufactured and suitable for new product development.

Q: Does the NXP part PCA9515AD,118 have any disadvantages?

A: The primary consideration is increased supply current (800µA versus 500µA). This 60% increase may impact power budget calculations in battery-powered or low-power applications. Electrical functionality remains equivalent.

Q: Are Tape & Reel packaging variants functionally identical to Tube packaging?

A: Yes. Packaging format (Tube versus Tape & Reel) affects supply chain and assembly processes only. Electrical and functional specifications remain identical. The suffix #TRPBF indicates Tape & Reel packaging; #PBF indicates Tube packaging.

Q: What is the temperature range limitation of LTC4301C variants?

A: LTC4301C variants operate from 0°C to 70°C, narrower than the original PCA9515AD range of -40°C to 85°C. LTC4301I variants extend to -40°C to 85°C, matching the original specification.

Q: Can I use LTC4301 parts in a 2.3V to 3.6V system?

A: Yes. The LTC4301 supply voltage range (2.7V to 5.5V) encompasses the upper portion of the PCA9515AD range (2.3V to 3.6V). Systems operating above 2.7V are fully compatible. Systems requiring operation below 2.7V require verification against specific LTC4301 datasheet minimum voltage specifications.

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