PCA9535DGVR Equivalent & Substitute Parts

Part Overview

The PCA9535DGVR is a 16-bit I/O expander designed for I2C and SMBus communication at 400 kHz, manufactured by Texas Instruments. This device is classified as Last Time Buy, indicating that the original part is approaching end-of-life status. The PCA9535DGVR operates across a supply voltage range of 2.3V to 5.5V and supports push-pull output configuration with source/sink current capabilities of 10mA and 25mA respectively. Finding equivalent substitute parts is necessary due to the Last Time Buy status, which may result in limited future availability and extended lead times.

Substiute Parts

PCA9535DGVR

Texas InstrumentsIn Stock: 3164PCA9535DGVR Datasheet

Current PartRFQ

TCA9535DBR

Texas InstrumentsIn Stock: 2445TCA9535DBR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PCA9535DGVR is determined by the following critical parameters:

Functional Equivalence: Both the main part and substitute must provide 16-bit I/O expansion with I2C and SMBus interface support at 400 kHz clock frequency.

Electrical Compatibility: Supply voltage range, output type (push-pull), and current source/sink ratings must meet or exceed the original specification. The substitute must support the same operating temperature range of -40°C to 85°C.

Compliance Requirements: Both parts must maintain ROHS3 compliance and equivalent moisture sensitivity levels to ensure manufacturing and long-term reliability consistency.

Package Consideration: While the main part uses 24-TFSOP packaging and the substitute uses 24-SSOP packaging, both are surface-mount 24-pin packages with different physical dimensions. PCB layout modifications are required when substituting between these package types.

The TCA9535DBR qualifies as a manufacturer-recommended substitute based on these criteria, with the primary distinction being the package form factor and an extended lower voltage supply limit.

Parameter Comparison

Engineering Selection Recommendations

The TCA9535DBR is the manufacturer-recommended substitute for the PCA9535DGVR. Both devices are manufactured by Texas Instruments and maintain ROHS3 compliance with identical moisture sensitivity levels, ensuring consistent manufacturing and environmental standards.

The primary advantage of selecting the TCA9535DBR is its Active product status, which guarantees continued availability and eliminates supply chain risk associated with the Last Time Buy designation of the PCA9535DGVR. The TCA9535DBR also provides an extended lower voltage supply limit of 1.65V compared to 2.3V, offering greater flexibility in low-voltage applications.

The critical consideration for substitution is the package form factor change from 24-TFSOP to 24-SSOP. This requires PCB layout redesign, as the two packages have different physical dimensions and pin spacing. The 24-SSOP package is wider (0.209" versus 0.173") and may affect board space allocation and component placement strategies.

All electrical parameters, including I/O count, interface protocols, clock frequency, output type, and current ratings, are identical between the two parts, ensuring functional compatibility at the circuit level once PCB layout modifications are completed.

Frequently Asked Questions (FAQ)

Q: Can the TCA9535DBR be used as a direct pin-for-pin replacement for the PCA9535DGVR?

A: No. While both devices are 24-pin packages, the PCA9535DGVR uses 24-TFSOP packaging and the TCA9535DBR uses 24-SSOP packaging. These packages have different physical dimensions and pin spacing, requiring PCB layout modifications. Direct socket substitution is not possible without redesigning the PCB footprint.

Q: Are the functional capabilities identical between these two parts?

A: Yes. Both devices provide 16-bit I/O expansion with I2C and SMBus interface support at 400 kHz. Output type, current ratings, operating temperature range, and all protocol specifications are identical.

Q: What is the significance of the voltage supply range difference?

A: The TCA9535DBR supports a lower minimum supply voltage of 1.65V compared to the PCA9535DGVR at 2.3V. This provides additional flexibility for applications requiring ultra-low voltage operation. Both devices support the same maximum voltage of 5.5V.

Q: Why is the PCA9535DGVR marked as Last Time Buy?

A: Last Time Buy status indicates that Texas Instruments is discontinuing this product. Existing inventory will be sold until depletion, after which the part will no longer be available. This status necessitates finding alternative parts for new designs and future production runs.

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

A: No. Both the PCA9535DGVR and TCA9535DBR are ROHS3 compliant with identical MSL ratings of 1 (Unlimited). They meet the same environmental and regulatory standards.

Q: What design considerations are necessary when switching from PCA9535DGVR to TCA9535DBR?

A: PCB layout redesign is required due to package form factor differences. The 24-SSOP package is wider than the 24-TFSOP package, which may affect component placement, trace routing, and overall board space allocation. Electrical schematic connections remain unchanged.