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PCA9508DP,118 Equivalent & Substitute Parts
Part Overview
The PCA9508DP,118 is a Buffer/ReDriver interface IC designed for I2C hotswap applications. Manufactured by NXP USA Inc., this single-channel 400kHz device operates across a 2.7V to 5.5V supply range with minimal current consumption of 1mA. The part is currently in Active product status with 2100 units in stock. Substitute parts become necessary when the original component reaches end-of-life, when alternative packaging or mounting types are required for design flexibility, or when supply constraints necessitate qualified alternatives that meet equivalent electrical and mechanical specifications.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | PCA9508DP,118 |
| Manufacturer | NXP USA Inc. |
| Category | Interface |
| Type | Buffer, ReDriver |
| Applications | I2C - Hotswap |
| Number of Channels | 1 |
| Data Rate (Max) | 400kHz |
| Input/Output | 2-Wire Bus |
| Voltage - Supply | 2.7V ~ 5.5V |
| Current - Supply | 1mA |
| Capacitance - Input | 5.2 pF |
| Operating Temperature | -40°C ~ 85°C |
| Package / Case | 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) |
| Mounting Type | Surface Mount |
| Product Status | Active |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution eligibility for the PCA9508DP,118 is determined by the following critical parameters: I2C interface compatibility (2-Wire Bus input/output), single-channel configuration, 400kHz data rate capability, supply voltage range overlap (minimum 2.7V operation), operating temperature range (-40°C to 85°C), and surface-mount packaging with equivalent or compatible footprints. Substitute parts are grouped into three categories based on packaging and channel configuration:
Category 1: Single-Channel 400kHz Surface Mount (8-SOIC Package) Parts P82B715D, P82B715DR, and P82B96D/P82B96DR meet the 400kHz I2C requirement with single or dual-channel configurations. These parts operate at higher supply voltages (4.5V minimum) and are available in 8-SOIC surface-mount packages, providing direct functional equivalence with different thermal and mechanical characteristics.
Category 2: Single-Channel 400kHz Through-Hole (8-DIP Package) Parts P82B715P and P82B96P provide identical electrical functionality in through-hole 8-DIP packaging, suitable for applications requiring manual assembly or breadboard prototyping while maintaining 400kHz I2C performance.
Category 3: Dual-Channel 400kHz Surface Mount (8-TSSOP Package) Parts P82B96PW and P82B96PWR offer dual-channel configurations in 8-TSSOP surface-mount packaging, matching the original package form factor while providing extended channel capacity. These parts maintain 400kHz operation and compatible supply voltage ranges.
Category 4: Advanced I2C ReDriver (8-VSSOP Package) Part PCA9517DGKR provides dual-channel 400kHz I2C redrive functionality in 8-VSSOP packaging with extended supply voltage flexibility (0.9V to 5.5V), though marked as Not For New Designs.
Category 5: Legacy I2C Repeater (8-MSOP Package) Part PCA9617ADMR2G is an obsolete single-channel I2C repeater in 8-MSOP packaging with ultra-low quiescent current (8µA) and extended temperature range (-55°C to 125°C), suitable only for legacy system maintenance.
Parameter Comparison
| Parameter | PCA9508DP,118 | P82B715D | P82B715DR | P82B715P | P82B96D | P82B96DR | P82B96P | P82B96PW | P82B96PWR | PCA9517DGKR | PCA9617ADMR2G |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | NXP USA Inc. | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | onsemi |
| Type | Buffer, ReDriver | Buffer, ReDriver | Buffer, ReDriver | Buffer, ReDriver | Buffer, ReDriver | Buffer, ReDriver | Buffer, ReDriver | Buffer, ReDriver | Buffer, ReDriver | Buffer, ReDriver | Buffer, ReDriver |
| Applications | I2C - Hotswap | I2C | I2C | I2C | I2C | I2C | I2C | I2C | I2C | I2C | I2C |
| Number of Channels | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 2 | 2 | 2 | 1 |
| Data Rate (Max) | 400kHz | — | — | — | 400kHz | 400kHz | 400kHz | 400kHz | 400kHz | 400kHz | — |
| Input/Output | 2-Wire Bus | 2-Wire Bus | 2-Wire Bus | 2-Wire Bus | 2-Wire Bus | 2-Wire Bus | 2-Wire Bus | 2-Wire Bus | 2-Wire Bus | 2-Wire Bus | 2-Wire Bus |
| Voltage - Supply | 2.7V ~ 5.5V | 4.5V ~ 12V | 4.5V ~ 12V | 4.5V ~ 12V | 2V ~ 15V | 2V ~ 15V | 2V ~ 15V | 2V ~ 15V | 2V ~ 15V | 0.9V ~ 5.5V, 2.7V ~ 5.5V | 2.7V ~ 5.5V |
| Current - Supply | 1mA | 22mA | 22mA | 22mA | 4mA | 4mA | 4mA | 4mA | 4mA | 1.5mA | 8µA |
| Capacitance - Input | 5.2 pF | 3000 pF | 3000 pF | 3000 pF | 4 pF | 4 pF | 4 pF | 4 pF | 4 pF | 6 pF | 10 pF |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -55°C ~ 125°C |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Through Hole | Surface Mount | Surface Mount | Through Hole | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| Package / Case | 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) | 8-SOIC (0.154", 3.90mm Width) | 8-SOIC (0.154", 3.90mm Width) | 8-DIP (0.300", 7.62mm) | 8-SOIC (0.154", 3.90mm Width) | 8-SOIC (0.154", 3.90mm Width) | 8-DIP (0.300", 7.62mm) | 8-TSSOP (0.173", 4.40mm Width) | 8-TSSOP (0.173", 4.40mm Width) | 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) | 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) |
| Product Status | Active | Last Time Buy | Active | Active | Last Time Buy | Active | Active | Last Time Buy | Active | Not For New Designs | Obsolete |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
Engineering Selection Recommendations
Recommended Primary Substitutes (Active Status)
For new designs and ongoing production requiring direct functional equivalence, P82B96DR and P82B96PWR are the preferred substitutes. Both parts maintain Active product status, offer 400kHz I2C performance, and provide superior supply voltage range (2V to 15V) compared to the original PCA9508DP,118. P82B96DR operates in 8-SOIC surface-mount packaging with 37,600 units in stock, while P82B96PWR provides identical functionality in 8-TSSOP packaging with 15,600 units available. Both are ROHS3 compliant and suitable for long-term production commitments.
Alternative Surface-Mount Options
P82B715DR represents an Active-status alternative with single-channel 400kHz capability in 8-SOIC packaging. This part operates at higher minimum supply voltage (4.5V) and exhibits significantly higher input capacitance (3000 pF) and supply current (22mA) compared to the original specification. Use this substitute only when 4.5V minimum supply voltage is acceptable and higher power consumption does not impact system design.
Through-Hole Alternatives
P82B715P and P82B96P provide through-hole 8-DIP packaging options for applications requiring manual assembly or breadboard implementation. Both maintain Active product status and 400kHz I2C performance. P82B96P offers superior availability (186,300 units) and lower supply current (4mA) compared to P82B715P (1,343 units, 22mA).
Legacy and End-of-Life Considerations
Parts marked Last Time Buy (P82B715D, P82B96D, P82B96PW) remain available but should not be selected for new designs due to limited future supply. PCA9517DGKR is marked Not For New Designs and should be avoided for new product development. PCA9617ADMR2G is Obsolete and suitable only for legacy system maintenance or repair applications requiring exact form-factor compatibility.
Frequently Asked Questions (FAQ)
Q: Can P82B96DR directly replace PCA9508DP,118 in existing designs?
A: P82B96DR provides functional I2C 400kHz redrive capability with 2-Wire Bus input/output and compatible operating temperature range. However, the 8-SOIC package differs from the original 8-TSSOP footprint, requiring PCB layout modification. Supply voltage range differs (2V to 15V versus 2.7V to 5.5V), which is acceptable if your system operates within the original voltage specification. Input capacitance (4 pF) is lower than the original (5.2 pF), and supply current is higher (4mA versus 1mA), which may impact power budget calculations.
Q: What is the difference between single-channel and dual-channel configurations?
A: The PCA9508DP,118 is a single-channel device, meaning it conditions one I2C bus pair (SDA and SCL). Dual-channel substitutes like P82B96DR and P82B96PWR condition two independent I2C bus pairs simultaneously. In applications requiring only one I2C bus, dual-channel parts operate with one channel unused, consuming additional power but providing no functional advantage. Single-channel alternatives (P82B715DR, P82B715P) are more power-efficient for single-bus applications.
Q: Are there supply voltage compatibility concerns with substitute parts?
A: Yes. The original PCA9508DP,118 operates from 2.7V to 5.5V. P82B715D and P82B715DR require minimum 4.5V supply, making them incompatible with 3.3V systems. P82B96 series parts (P82B96D, P82B96DR, P82B96P, P82B96PW, P82B96PWR) operate from 2V to 15V, providing broader compatibility. PCA9517DGKR supports 0.9V to 5.5V or 2.7V to 5.5V depending on configuration, offering maximum flexibility for low-voltage applications. Verify your system supply voltage before selecting a substitute.
Q: How do packaging differences affect PCB design?
A: The original PCA9508DP,118 uses 8-TSSOP packaging (0.118" width, 3.00mm). P82B715D/P82B715DR use 8-SOIC packaging (0.154" width, 3.90mm), requiring different PCB footprints and potentially larger board space. P82B715P and P82B96P use 8-DIP through-hole packaging (0.300" width, 7.62mm), suitable for breadboards but incompatible with surface-mount assembly. P82B96PW and P82B96PWR use 8-TSSOP packaging (0.173" width, 4.40mm), which is mechanically similar to the original but with slightly different dimensions. PCA9517DGKR and PCA9617ADMR2G use 8-TSSOP/8-MSOP packaging (0.118" width, 3.00mm), matching the original footprint exactly.
Q: What is the significance of product status (Active, Last Time Buy, Obsolete)?
A: Active status indicates the manufacturer continues production and supports long-term availability, suitable for new designs and ongoing production. Last Time Buy status signals the manufacturer will cease production after a specified date, with limited remaining inventory. Parts in Last Time Buy status should not be selected for new designs but may be acceptable for short-term production runs if inventory is sufficient. Obsolete status indicates production has ended and parts are available only through remaining inventory channels, suitable only for legacy system maintenance or repair.
Q: Does input capacitance affect I2C bus performance?
A: Input capacitance contributes to total I2C bus capacitance, which affects signal rise time and maximum bus length. The original PCA9508DP,118 has 5.2 pF input capacitance. P82B96 series parts have 4 pF (lower), while P82B715 series parts have 3000 pF (significantly higher). Higher input capacitance may require slower I2C clock speeds or shorter bus lengths to maintain signal integrity. For 400kHz I2C operation, the difference is typically negligible, but for future upgrades to faster I2C speeds (1MHz or higher), lower input capacitance substitutes are preferable.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All listed substitute parts are ROHS3 compliant, matching the original PCA9508DP,118 compliance status. This ensures compatibility with environmental regulations and procurement requirements across all regions.
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