PCA9557DR Equivalent & Substitute Parts

Part Overview

The PCA9557DR is an 8-bit I/O expander IC manufactured by Texas Instruments, designed for I2C and SMBus communication at 400 kHz. This device provides 8 programmable input/output lines with open drain and push-pull output capabilities, operating across a supply voltage range of 2.3V to 5.5V. The part is currently in active production status and is RoHS3 compliant. Substitute parts are identified when equivalent electrical specifications, functional capabilities, and mechanical compatibility are maintained across the same package footprint and interface protocol.

Substiute Parts

PCA9557DR

Texas InstrumentsIn Stock: 154594PCA9557DR Datasheet

Current PartRFQ

PCA9557D,118

NXP SemiconductorsIn Stock: 4796PCA9557D,118 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the PCA9557DR are qualified based on strict equivalence of the following electrical and mechanical parameters:

• I/O Configuration: 8 programmable input/output lines
• Communication Protocol: I2C and SMBus compatibility at 400 kHz clock frequency
• Output Characteristics: Open drain and push-pull output types with identical current ratings (10mA, 25mA source/sink)
• Supply Voltage Range: 2.3V to 5.5V operation
• Temperature Range: -40°C to 85°C operating specification
• Package Footprint: 16-SOIC mechanical compatibility (0.154", 3.90mm width)
• Compliance: RoHS3 and REACH compliance status

The PCA9557D,118 manufactured by NXP Semiconductors meets all electrical and functional requirements for direct substitution. Both parts share identical I/O count, interface protocols, output configurations, and supply specifications. The primary difference is packaging format: the main part uses Cut Tape (CT) & Digi-Reel® delivery, while the substitute uses Tape & Reel (TR) format. Both maintain the same 16-SOIC package footprint suitable for surface mount assembly.

Parameter Comparison

Engineering Selection Recommendations

Both the PCA9557DR and PCA9557D,118 are active production devices with full RoHS3 and REACH compliance. Selection between these parts should be based on packaging and supply chain requirements rather than electrical performance, as all functional specifications are identical.

The PCA9557DR in Cut Tape format is suitable for lower-volume applications, prototyping, and component-level procurement. The PCA9557D,118 in Tape & Reel format is optimized for high-volume manufacturing and automated assembly processes. Both parts maintain identical electrical performance, thermal characteristics, and interface compatibility within the specified operating ranges.

Frequently Asked Questions (FAQ)

Q: Can PCA9557D,118 be used as a direct replacement for PCA9557DR in existing designs?

A: Yes. Both parts are electrically and functionally identical with matching I/O count, interface protocols, output configurations, supply voltage ranges, and operating temperature specifications. The 16-SOIC package footprint is identical, ensuring mechanical compatibility on PCBs designed for either part.

Q: What is the difference between Cut Tape and Tape & Reel packaging?

A: Cut Tape (CT) & Digi-Reel® format is supplied in individual component strips suitable for manual handling and lower-volume applications. Tape & Reel (TR) format provides components on continuous tape reels optimized for automated pick-and-place assembly in high-volume manufacturing. Both formats contain the same component in the same package.

Q: Are there any compliance or certification differences between these parts?

A: No. Both the PCA9557DR and PCA9557D,118 maintain identical RoHS3 compliance, REACH unaffected status, and Moisture Sensitivity Level 1 (Unlimited) ratings. Regulatory and environmental compliance is equivalent across both parts.

Q: What determines substitution eligibility for I/O expander ICs?

A: Substitution eligibility is determined by matching I/O count, communication protocol (I2C/SMBus frequency), output type and current ratings, supply voltage range, operating temperature range, package footprint, and compliance certifications. All these parameters must be identical for direct substitution without design modification.

Q: Can the PCA9557D,118 operate in the same temperature and voltage ranges as the PCA9557DR?

A: Yes. Both parts operate across -40°C to 85°C and support supply voltages from 2.3V to 5.5V. Thermal and electrical operating specifications are fully equivalent.