PCA9538D,112 Equivalent & Substitute Parts

Part Overview

The PCA9538D,112 is an 8-bit I/O expander interface circuit manufactured by NXP USA Inc., designed for I2C and SMBus communication at 400 kHz. This component operates across a supply voltage range of 2.3V to 5.5V and features push-pull output capability with 10mA/25mA source/sink current. The device is classified as obsolete, which necessitates identification of functionally equivalent alternatives for new designs and ongoing production requirements.

Substiute Parts

PCA9538D,112

NXP USA Inc.In Stock: 1110PCA9538D,112 Datasheet

Current PartRFQ

PCA9538PW,118

NXP SemiconductorsIn Stock: 3151PCA9538PW,118 Datasheet

MFR RecommendedRFQ

PCA9538DW

Texas InstrumentsIn Stock: 947PCA9538DW Datasheet

DirectRFQ

PCA9538PW,118

NXP SemiconductorsIn Stock: 3151PCA9538PW,118 Datasheet

MFR RecommendedRFQ

PCA9538DW

Texas InstrumentsIn Stock: 947PCA9538DW Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PCA9538D,112 is determined by strict equivalence across the following parameters: 8 I/O lines, I2C/SMBus interface protocol, 400 kHz clock frequency, push-pull output configuration, 10mA/25mA output current capability, 2.3V to 5.5V supply voltage range, and -40°C to 85°C operating temperature. Package compatibility is secondary; substitutes may employ different surface-mount packages (16-SOIC or 16-TSSOP) provided all electrical specifications remain identical. All identified substitutes maintain ROHS3 compliance and MSL Level 1 rating.

Parameter Comparison

Engineering Selection Recommendations

The PCA9538PW,118 manufactured by NXP Semiconductors is the primary recommended substitute. This part maintains active product status and full electrical equivalence to the PCA9538D,112. The package differs (16-TSSOP versus 16-SOIC), requiring PCB layout modification but offering reduced footprint dimensions. This substitute is suitable for new designs and ongoing production where board space optimization is beneficial.

The PCA9538DW manufactured by Texas Instruments provides direct package compatibility (16-SOIC) with the original part. However, this device carries Last Time Buy status, indicating limited future availability. Selection of this substitute is appropriate only for short-term production runs or maintenance applications where existing PCB designs cannot be modified.

Both substitutes maintain ROHS3 compliance and identical electrical specifications, ensuring functional interchangeability within the specified operating parameters.

Frequently Asked Questions (FAQ)

Q: Can PCA9538PW,118 replace PCA9538D,112 in existing designs? A: Electrical substitution is complete. PCB layout modification is required due to package change from 16-SOIC to 16-TSSOP. Pin-to-pin compatibility exists, but footprint differs.

Q: What is the primary advantage of selecting PCA9538PW,118? A: Active product status ensures long-term availability and supply chain stability. The 16-TSSOP package provides reduced board footprint (4.40mm width versus 7.50mm).

Q: Is PCA9538DW suitable for new production? A: PCA9538DW carries Last Time Buy status, indicating manufacturer discontinuation. This part is suitable only for maintenance production or designs with existing 16-SOIC footprints where supply remains available.

Q: Are all three parts electrically identical? A: Yes. All three parts maintain identical electrical specifications: 8 I/O lines, I2C/SMBus 400 kHz interface, push-pull output, 10mA/25mA current capability, 2.3V to 5.5V supply range, and -40°C to 85°C operating temperature.

Q: What compliance certifications apply to substitute parts? A: Both PCA9538PW,118 and PCA9538DW maintain ROHS3 compliance, REACH Unaffected status, and MSL Level 1 rating, matching the original PCA9538D,112 specifications.

Q: Does package selection affect I2C/SMBus communication? A: No. Package differences (16-SOIC versus 16-TSSOP) do not affect electrical performance or protocol compatibility. Selection is based on PCB layout requirements and design constraints.