PI4IOE5V9555LE I/O Expander Equivalent & Substitute Parts

Part Overview

The PI4IOE5V9555LE is a 16-bit I/O expander manufactured by Diodes Incorporated, designed for I2C communication at 400 kHz. This interface component operates across a wide supply voltage range of 2.3V to 5.5V and is housed in a 24-TSSOP surface mount package. The device is currently in active production status with 2100 units in stock.

Substitute parts become necessary when the primary component experiences supply constraints, end-of-life transitions, or when alternative manufacturers' offerings provide equivalent functionality within the same electrical and mechanical specifications.

Substiute Parts

PI4IOE5V9555LE

Diodes IncorporatedIn Stock: 2119PI4IOE5V9555LE Datasheet

Current PartRFQ

PCA9535CPW,118

NXP USA Inc.In Stock: 3285PCA9535CPW,118 Datasheet

MFR RecommendedRFQ

PCA9535ECDTR2G

onsemiIn Stock: 36200PCA9535ECDTR2G Datasheet

MFR RecommendedRFQ

PCF8575CPW

Texas InstrumentsIn Stock: 726PCF8575CPW Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PI4IOE5V9555LE is determined by the following critical parameters:

• 16 I/O channels via I2C interface
• 400 kHz clock frequency operation
• 2.3V to 5.5V supply voltage compatibility
• 24-TSSOP package footprint
• Interrupt output capability
• ROHS3 compliance and MSL 1 rating

The substitute parts listed below maintain these core electrical and mechanical specifications, ensuring functional equivalence in circuit applications. Variations in product status, output type, and current ratings are noted but do not preclude substitution when application requirements permit.

Parameter Comparison

Engineering Selection Recommendations

PCA9535CPW,118 (NXP USA Inc.) is the primary recommended substitute. This part maintains identical electrical specifications including 400 kHz I2C operation, 2.3V to 5.5V supply range, and -40°C to 85°C temperature rating. The device is in active production status with 3200 units available. SMBus compatibility provides enhanced protocol flexibility. Open drain output configuration with 10mA and 25mA current ratings supports standard I2C bus topologies.

PCA9535ECDTR2G (onsemi) offers extended operating temperature range (-55°C to 125°C) and lower minimum supply voltage (1.65V), making it suitable for demanding thermal environments. However, this part is obsolete and clock frequency is limited to 100 kHz, which may not meet applications requiring 400 kHz I2C operation. Use only when extended temperature performance is critical and lower I2C speed is acceptable.

PCF8575CPW (Texas Instruments) maintains 400 kHz I2C operation and identical package footprint. This part is obsolete with limited inventory (631 units). The supply voltage range is restricted to 4.5V to 5.5V, eliminating compatibility with lower voltage applications supported by the primary part. Selection should be limited to legacy system maintenance where supply voltage constraints do not apply.

Frequently Asked Questions (FAQ)

Q: Can PCA9535ECDTR2G replace PI4IOE5V9555LE in all applications?

A: PCA9535ECDTR2G is electrically compatible for 16-bit I2C I/O expansion. However, the 100 kHz clock frequency limitation may not satisfy applications requiring 400 kHz I2C bus speed. Verify application I2C speed requirements before selection.

Q: What is the primary difference between the substitute parts?

A: PCA9535CPW,118 matches the original part's 400 kHz clock frequency and is in active production. PCA9535ECDTR2G operates at 100 kHz with extended temperature range but is obsolete. PCF8575CPW operates at 400 kHz but has a narrower supply voltage range (4.5V to 5.5V) and is obsolete.

Q: Are all substitute parts pin-compatible with PI4IOE5V9555LE?

A: All substitute parts use the 24-TSSOP package with identical pinout for I2C interface, interrupt output, and power connections. PCB layout modifications are not required for mechanical substitution.

Q: Which substitute part has the best long-term availability?

A: PCA9535CPW,118 from NXP USA Inc. is in active production status with 3200 units in stock, providing the most reliable long-term supply chain position.

Q: Does SMBus compatibility affect I2C operation?

A: SMBus is a subset protocol of I2C. Devices with SMBus support (PCA9535CPW,118 and PCA9535ECDTR2G) operate fully in standard I2C mode and are directly compatible with I2C-only applications.