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PCA9554TS,112 Equivalent & Substitute Parts
Part Overview
The PCA9554TS,112 is an 8-bit I/O Expander with I2C and SMBus interface operating at 400 kHz, manufactured by NXP USA Inc. in a 20-SSOP package. This component is classified as Obsolete, making identification of compatible substitutes essential for ongoing system support and new design implementations. The part provides push-pull output configuration with interrupt capability and power-on reset (POR) functionality, suitable for applications requiring expanded I/O capabilities in I2C-based systems.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer | NXP USA Inc. |
| Category | Interface |
| Number of I/O | 8 |
| Interface Type | I2C, SMBus |
| Clock Frequency | 400 kHz |
| Voltage Supply Range | 2.3V ~ 5.5V |
| Output Type | Push-Pull |
| Current Output Source/Sink | 10mA, 25mA |
| Operating Temperature | -40°C ~ 85°C |
| Mounting Type | Surface Mount |
| Package | 20-LSSOP (0.173", 4.40mm Width) |
| RoHS Status | ROHS3 Compliant |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitution of the PCA9554TS,112 is determined by the following critical parameters:
- I/O Configuration: 8-bit I/O expander functionality
- Interface Protocol: I2C and SMBus compatibility at 400 kHz clock frequency
- Electrical Characteristics: Push-pull output type with 10mA/25mA source/sink capability
- Supply Voltage: Operating range compatibility (minimum 2.3V required)
- Temperature Range: -40°C to 85°C operational envelope
- Compliance: ROHS3 compliance and REACH unaffected status
The PCA9554BPWJ qualifies as a direct substitute based on matching all critical functional parameters while offering improved product status (Active) and enhanced supply voltage range (1.65V ~ 5.5V). Package differences (16-TSSOP vs. 20-LSSOP) require PCB layout verification but do not affect electrical compatibility.
Parameter Comparison
| Parameter | PCA9554TS,112 (Main) | PCA9554BPWJ (Substitute) |
|---|---|---|
| Manufacturer | NXP USA Inc. | NXP USA Inc. |
| Number of I/O | 8 | 8 |
| Interface Type | I2C, SMBus | I2C, SMBus |
| Clock Frequency | 400 kHz | 400 kHz |
| Voltage Supply Range | 2.3V ~ 5.5V | 1.65V ~ 5.5V |
| Output Type | Push-Pull | Push-Pull |
| Current Output Source/Sink | 10mA, 25mA | 10mA, 25mA |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
| Package / Case | 20-LSSOP (0.173", 4.40mm Width) | 16-TSSOP (0.173", 4.40mm Width) |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant |
| Product Status | Obsolete | Active |
Engineering Selection Recommendations
The PCA9554BPWJ is the qualified substitute for PCA9554TS,112 based on the following engineering criteria:
Functional Equivalence: Both devices provide identical 8-bit I/O expansion with I2C/SMBus 400 kHz interface, push-pull output configuration, and matching current drive specifications.
Compliance Alignment: Both parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory consistency in production environments.
Product Lifecycle: The PCA9554BPWJ carries Active product status, providing long-term availability and supply chain stability compared to the Obsolete PCA9554TS,112.
Supply Voltage Advantage: The PCA9554BPWJ extends the minimum supply voltage to 1.65V, enabling operation in lower-voltage applications while maintaining full compatibility with 2.3V ~ 5.5V systems.
Package Consideration: The transition from 20-LSSOP to 16-TSSOP requires PCB layout modification. Both packages maintain 0.173" width and surface mount compatibility, but pin count and footprint differ. Design verification is necessary for existing board layouts.
Frequently Asked Questions (FAQ)
Q: Can PCA9554BPWJ directly replace PCA9554TS,112 without design changes?
A: Electrical and functional compatibility is complete. However, the package change from 20-LSSOP to 16-TSSOP requires PCB footprint modification. Pin assignments must be verified against the respective datasheets to ensure correct signal routing.
Q: What is the significance of the supply voltage range difference?
A: The PCA9554BPWJ supports 1.65V minimum supply, compared to 2.3V for the PCA9554TS,112. This provides flexibility for lower-voltage applications. Systems already operating at 2.3V ~ 5.5V experience no functional change.
Q: Are both parts suitable for new designs?
A: The PCA9554BPWJ is recommended for new designs due to Active product status and assured long-term availability. The PCA9554TS,112 is Obsolete and should be used only for legacy system maintenance.
Q: Do the parts share identical I2C protocol and register maps?
A: Both devices implement I2C and SMBus protocols at 400 kHz with matching functional specifications. Register-level compatibility is maintained, allowing firmware and software to operate without modification.
Q: What packaging options are available for the substitute?
A: The PCA9554BPWJ is supplied in Cut Tape (CT) and Digi-Reel® packaging formats, supporting both prototype and production volume requirements.
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