PCAL9539APW,118 Equivalent & Substitute Parts

Part Overview

The PCAL9539APW,118 is a 16-bit I/O Expander manufactured by NXP USA Inc., designed for I2C and SMBus communication at 400 kHz. This interface component operates across a wide supply voltage range of 1.65V to 5.5V and is housed in a 24-TSSOP surface mount package. The device is currently in active production status with 2474 units available in stock. Substitute parts are identified when equivalent functional performance can be achieved while accommodating different packaging requirements or supply voltage specifications.

Substiute Parts

PCAL9539APW,118

NXP USA Inc.In Stock: 2490PCAL9539APW,118 Datasheet

Current PartRFQ

SX1509BIULTRT

Semtech CorporationIn Stock: 27353SX1509BIULTRT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PCAL9539APW,118 is determined by the following critical parameters:

• 16-bit I/O count
• I2C protocol support at 400 kHz minimum clock frequency
• Interrupt output capability
• Open Drain and Push-Pull output types
• Operating temperature range of -40°C to 85°C
• Surface mount technology
• Active product status and ROHS3 compliance

The SX1509BIULTRT qualifies as a substitute based on matching I/O count, I2C protocol support, clock frequency, interrupt capability, output types, and operating temperature range. Differences in supply voltage range and package configuration are acceptable variations within the substitution criteria for this component category.

Parameter Comparison

Engineering Selection Recommendations

Both the PCAL9539APW,118 and SX1509BIULTRT are active production components with ROHS3 compliance and REACH unaffected status. Selection between these parts depends on system-level requirements:

The PCAL9539APW,118 is appropriate for applications requiring the extended supply voltage range of 1.65V to 5.5V and higher output current capability of 25mA sink/source. The 24-TSSOP package provides a compact footprint suitable for space-constrained designs.

The SX1509BIULTRT is suitable for applications operating within the 1.425V to 3.6V supply range and where the 28-UFQFN package footprint is acceptable. This substitute provides additional features including keypad controller and LED output functionality. The lower output current specification of 15mA requires verification against application load requirements.

Frequently Asked Questions (FAQ)

Q: Can the SX1509BIULTRT directly replace the PCAL9539APW,118 in all applications?

A: Direct replacement is possible only when the application supply voltage operates within 1.425V to 3.6V and output current requirements do not exceed 15mA. The SX1509BIULTRT does not support SMBus protocol; applications requiring SMBus must retain the PCAL9539APW,118.

Q: What are the package differences between these parts?

A: The PCAL9539APW,118 uses a 24-TSSOP package with 0.173" width and 4.40mm height. The SX1509BIULTRT uses a 28-UFQFN package with exposed pad. PCB layout and routing requirements differ between these packages.

Q: Are both parts suitable for the same operating temperature range?

A: Yes, both parts operate from -40°C to 85°C, making them equivalent in this specification.

Q: What is the impact of different output current ratings?

A: The PCAL9539APW,118 provides 25mA source/sink capability, while the SX1509BIULTRT provides 15mA. Applications requiring higher current drive must use the PCAL9539APW,118.

Q: Do both parts support I2C at 400 kHz?

A: Yes, both parts support I2C communication at 400 kHz clock frequency. The PCAL9539APW,118 additionally supports SMBus protocol.