PCA9539BSHP Equivalent & Substitute Parts

Part Overview

The PCA9539BSHP is a 16-bit I/O Expander with I2C interface operating at 400 kHz, manufactured by NXP USA Inc. in a 24-HVQFN (4x4) surface mount package. This part is classified as Obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

The PCA9539BSHP provides 16 programmable I/O lines with open drain output configuration, interrupt output capability, and power-on reset (POR) feature. It operates across a supply voltage range of 2.3V to 5.5V and temperature range of -40°C to 85°C, with 50mA source/sink current capability per output.

Substiute Parts

PCA9539BSHP

NXP USA Inc.In Stock: 2119PCA9539BSHP Datasheet

Current PartRFQ

PCA9539AHF,128

NXP USA Inc.In Stock: 28364PCA9539AHF,128 Datasheet

MFR RecommendedRFQ

PI4IOE5V9673ZDEX

Diodes IncorporatedIn Stock: 2308PI4IOE5V9673ZDEX Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the PCA9539BSHP is determined by the following critical parameters:

• I/O Count: 16 lines (mandatory match)
• Interface Protocol: I2C at 400 kHz (mandatory match)
• Supply Voltage Range: 2.3V ~ 5.5V (minimum requirement)
• Operating Temperature: -40°C ~ 85°C (mandatory match)
• Package Type: 24-pin QFN surface mount (physical compatibility)
• Interrupt Output: Yes (functional requirement)
• RoHS3 Compliance: Required for regulatory alignment

Two substitute parts meet these criteria with varying output configurations and voltage specifications.

Parameter Comparison

Engineering Selection Recommendations

PCA9539AHF,128 (NXP USA Inc., Active Status)

This part is the manufacturer-recommended substitute from NXP. It maintains the same I/O count, interface protocol, and operating temperature range as the original PCA9539BSHP. The extended lower supply voltage limit (1.65V vs. 2.3V) provides additional design flexibility for low-power applications. The push-pull output configuration differs from the open-drain design of the original part, requiring circuit topology evaluation. Current output capability is reduced (10mA/25mA vs. 50mA), which may impact applications requiring higher drive strength. Active product status ensures long-term availability and supply chain continuity. ROHS3 compliance and MSL-1 rating match the original specification.

PI4IOE5V9673ZDEX (Diodes Incorporated, Active Status)

This alternative from Diodes Incorporated provides functional equivalence with matching I/O count, I2C interface at 400 kHz, and identical supply voltage range (2.3V ~ 5.5V). Operating temperature range and RoHS3 compliance align with the original part. The 24-TQFN package differs from the 24-VFQFN of the original, requiring PCB layout verification for pin compatibility. Output type and current specifications are not provided in available documentation. Active product status supports procurement continuity. This option is suitable for designs where package footprint compatibility can be accommodated.

Frequently Asked Questions (FAQ)

Q: Can PCA9539AHF,128 directly replace PCA9539BSHP in existing designs?

A: Functional replacement is possible with circuit evaluation. The key difference is output configuration: PCA9539AHF,128 uses push-pull outputs versus open-drain on the original. This affects pull-up resistor requirements and circuit topology. Current output capability is also reduced (10mA/25mA vs. 50mA), which must be verified against load requirements.

Q: What is the primary advantage of PCA9539AHF,128 over the original part?

A: PCA9539AHF,128 is an active product with guaranteed long-term availability, addressing the obsolescence of PCA9539BSHP. It also supports SMBus protocol in addition to I2C, providing protocol flexibility. The extended lower voltage limit (1.65V) enables operation in lower-power supply systems.

Q: Are there package compatibility concerns with PI4IOE5V9673ZDEX?

A: Yes. PI4IOE5V9673ZDEX uses a 24-TQFN package while PCA9539BSHP uses 24-VFQFN. Although both are 24-pin QFN packages with 4x4mm dimensions, pin assignments and footprint details must be verified against the original design before PCB layout modification.

Q: Do all substitute parts meet the same compliance requirements?

A: Yes. Both PCA9539AHF,128 and PI4IOE5V9673ZDEX are ROHS3 compliant with MSL-1 (Unlimited) moisture sensitivity rating, matching the original PCA9539BSHP specifications.

Q: Which substitute is recommended for new designs?

A: Selection depends on specific circuit requirements. PCA9539AHF,128 is the manufacturer-recommended option from NXP with proven compatibility in existing PCA9539 designs. PI4IOE5V9673ZDEX is suitable for applications where Diodes Incorporated supply chain preference exists and package footprint can be accommodated.