PCA9511D,118 Equivalent & Substitute Parts

Part Overview

The PCA9511D,118 is an I2C/SMBus buffer accelerator manufactured by NXP USA Inc., designed for hotswap applications requiring single-channel 400kHz signal conditioning. This component operates across a 2.7V to 5.5V supply range with 8-SOIC surface mount packaging. The part is currently obsolete, making equivalent and substitute components necessary for ongoing system support and new designs requiring similar functionality.

Key Parameters

Parameter	Value
Manufacturer Part Number	PCA9511D,118
Manufacturer	NXP USA Inc.
Category	Interface
Type	Buffer, Accelerator
Applications	I2C - Hotswap
Data Rate (Max)	400kHz
Number of Channels	1
Voltage - Supply	2.7V ~ 5.5V
Current - Supply	6mA
Operating Temperature	-40°C ~ 85°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the PCA9511D,118 is determined by the following critical parameters:

Primary Substitution Criteria:

I2C/SMBus hotswap buffer functionality
Single-channel configuration
400kHz maximum data rate capability
2.7V to 5.5V supply voltage compatibility
8-SOIC package form factor
Operating temperature range -40°C to 85°C
ROHS3 compliance and EAR99 classification

Substitute parts are grouped into two categories:

Direct Equivalents (NXP PCA Series): Parts maintaining identical electrical specifications, package type, and active product status. These include PCA9511AD,118 (active status, identical specifications), PCA9512AD,118 (parametric equivalent with reduced supply current), and PCA9510AD,118 (redriver variant with similar electrical envelope).

Cross-Manufacturer Alternatives: Parts from Texas Instruments and Analog Devices providing equivalent I2C buffer acceleration functionality within the specified electrical and thermal parameters, though with potential package variations (8-SOIC versus SOT-23-5).

Parameter Comparison

Part Number	Manufacturer	Type	Data Rate (Max)	Channels	Supply Voltage	Supply Current	Temp Range	Package	Status
PCA9511D,118	NXP USA Inc.	Buffer, Accelerator	400kHz	1	2.7V ~ 5.5V	6mA	-40°C ~ 85°C	8-SOIC	Obsolete
PCA9511AD,118	NXP USA Inc.	Buffer, Accelerator	400kHz	1	2.7V ~ 5.5V	6mA	-40°C ~ 85°C	8-SOIC	Active
PCA9512AD,118	NXP USA Inc.	Buffer, Accelerator	400kHz	1	2.7V ~ 5.5V	1.8mA	-40°C ~ 85°C	8-SOIC	Active
PCA9510AD,118	NXP USA Inc.	Buffer, ReDriver	400kHz	1	2.7V ~ 5.5V	6mA	-40°C ~ 85°C	8-SOIC	Active
TCA4311ADR	Texas Instruments	Buffer, Accelerator	Not specified	1	2.7V ~ 5.5V	5.1mA	-40°C ~ 85°C	8-SOIC	Active
LTC1694-1IS5#TRPBF	Analog Devices Inc.	Buffer, Accelerator	100kHz	1	2.7V ~ 6V	60µA	-40°C ~ 85°C	SOT-23-5	Active
LTC1694CS5#TRPBF	Analog Devices Inc.	Buffer, Accelerator	400kHz	1	2.7V ~ 6V	60µA	0°C ~ 70°C	SOT-23-5	Active

Engineering Selection Recommendations

Tier 1 - Direct Replacement (Recommended): PCA9511AD,118 is the primary substitute, offering identical electrical specifications and active product status from the original manufacturer. This part maintains 100% functional compatibility with existing designs and requires no circuit modifications.

Tier 2 - Parametric Equivalent: PCA9512AD,118 provides equivalent functionality with reduced supply current consumption (1.8mA versus 6mA), beneficial for power-constrained applications. Electrical and thermal specifications remain compatible with the original design envelope.

Tier 3 - Functional Alternatives (Same Package): PCA9510AD,118 (NXP ReDriver variant) and TCA4311ADR (Texas Instruments) maintain 8-SOIC packaging and compatible supply voltage/temperature ranges. These parts support I2C hotswap applications at 400kHz with active product status and full compliance certifications.

Tier 4 - Package Variant Alternatives: LTC1694CS5#TRPBF (Analog Devices) provides 400kHz I2C buffer acceleration in SOT-23-5 package with significantly reduced supply current (60µA). This option requires PCB layout modification due to package change but offers superior power efficiency. Operating temperature range is 0°C to 70°C, which may not cover full industrial specifications.

All recommended substitutes maintain ROHS3 compliance, EAR99 classification, and unlimited moisture sensitivity level (MSL 1).

Frequently Asked Questions (FAQ)

Q: Can PCA9511AD,118 directly replace PCA9511D,118 without circuit modifications? A: Yes. PCA9511AD,118 is electrically and mechanically identical to the obsolete PCA9511D,118, with the same 8-SOIC package, supply voltage range (2.7V ~ 5.5V), operating temperature (-40°C ~ 85°C), and 400kHz data rate specification. No design changes are required.

Q: What is the difference between PCA9511AD,118 and PCA9512AD,118? A: Both parts are single-channel I2C buffer accelerators with 400kHz capability in 8-SOIC packaging. The primary difference is supply current: PCA9512AD,118 draws 1.8mA compared to 6mA for PCA9511AD,118. Input capacitance is identical at 10pF. PCA9512AD,118 is preferred for power-sensitive applications.

Q: Why is TCA4311ADR listed as a substitute if it does not specify maximum data rate? A: TCA4311ADR is functionally equivalent for I2C hotswap buffer acceleration with compatible supply voltage (2.7V ~ 5.5V), operating temperature (-40°C ~ 85°C), and 8-SOIC packaging. The unspecified data rate does not preclude substitution in applications where 400kHz operation is required, as the part is designed for I2C acceleration. Verification with Texas Instruments datasheet is recommended for critical timing applications.

Q: Can Analog Devices LTC1694 series parts replace the PCA9511D,118? A: LTC1694 parts provide I2C buffer acceleration functionality with compatible supply voltage and active product status. However, package differences (SOT-23-5 versus 8-SOIC) require PCB redesign. LTC1694-1IS5#TRPBF maintains the full -40°C ~ 85°C temperature range but operates at 100kHz maximum. LTC1694CS5#TRPBF supports 400kHz operation but is limited to 0°C ~ 70°C. These are suitable only when package change is feasible.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance and are classified as EAR99 for export control purposes, matching the original PCA9511D,118 certifications.

Q: What packaging options are available for substitutes? A: NXP PCA series substitutes (PCA9511AD,118, PCA9512AD,118, PCA9510AD,118) maintain the original 8-SOIC (0.154", 3.90mm width) package. TCA4311ADR also uses 8-SOIC. Analog Devices LTC1694 variants use SOT-23-5 Thin package, requiring circuit board layout modifications if selected.

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