PCA8550DBR Equivalent & Substitute Parts

Part Overview

The PCA8550DBR is a 1 x 4:4 multiplexer IC manufactured by Texas Instruments in a 16-SSOP surface mount package. This part is classified as obsolete, making identification of functional equivalents essential for ongoing design support and procurement planning. The PCA8550DBR operates from a single 3V to 3.6V supply with output currents of 2mA (high and low), serving applications requiring multiplexed signal routing in compact form factors.

Substiute Parts

PCA8550DBR

Texas InstrumentsIn Stock: 1635PCA8550DBR Datasheet

Current PartRFQ

SN74LV157ADBR

Texas InstrumentsIn Stock: 992SN74LV157ADBR Datasheet

MFR RecommendedRFQ

PCA8550DB,118

NXP SemiconductorsIn Stock: 2434PCA8550DB,118 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the PCA8550DBR are classified into two categories based on substitution criteria:

Parametric Equivalent (Direct Functional Replacement): The PCA8550DB,118 from NXP Semiconductors maintains identical electrical specifications: 1 x 4:4 circuit configuration, 3V to 3.6V supply voltage, 2mA output current, and 0°C to 70°C operating temperature range. This part shares the same 16-SSOP package footprint and mechanical compatibility. Both parts are obsolete with equivalent compliance certifications (ROHS3, MSL 1).

MFR Recommended Substitute (Functional Alternative): The SN74LV157ADBR from Texas Instruments provides functional multiplexing capability with a different circuit topology (4 x 2:1 instead of 1 x 4:4). This part is active in production status and operates across a wider voltage range (2V to 5.5V) with higher output current capability (12mA). The 16-SSOP package footprint is identical. This substitute requires circuit-level evaluation due to differing multiplexer architecture and expanded operating specifications.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): The PCA8550DB,118 is the appropriate selection when maintaining exact electrical and thermal specifications is required. Both parts are obsolete with equivalent compliance status (ROHS3 Compliant, MSL 1 Unlimited). Mechanical compatibility is confirmed through identical 16-SSOP packaging. This substitute is suitable for applications where the 1 x 4:4 multiplexer topology and 3V to 3.6V supply voltage are design constraints.

For Production Continuity (Active Status): The SN74LV157ADBR offers the advantage of active production status, ensuring long-term availability and supply chain stability. This part maintains identical package footprint and surface mount compatibility. Selection of this substitute requires verification that the 4 x 2:1 circuit topology, expanded voltage range (2V to 5.5V), and increased output current (12mA) align with application requirements. The extended operating temperature range (-40°C to 85°C) provides additional thermal margin compared to the original part.

Frequently Asked Questions (FAQ)

Q: Can the PCA8550DB,118 be used as a direct drop-in replacement for the PCA8550DBR?

A: Yes. The PCA8550DB,118 maintains identical circuit configuration (1 x 4:4), voltage supply range (3V to 3.6V), output current specifications (2mA), operating temperature range (0°C to 70°C), and 16-SSOP package footprint. Both parts are obsolete with equivalent compliance certifications.

Q: What are the key differences between the PCA8550DBR and SN74LV157ADBR?

A: The primary differences are circuit topology (1 x 4:4 versus 4 x 2:1), voltage supply range (3V to 3.6V versus 2V to 5.5V), output current capability (2mA versus 12mA), operating temperature range (0°C to 70°C versus -40°C to 85°C), and product status (obsolete versus active). The 16-SSOP package footprint is identical.

Q: Is the SN74LV157ADBR suitable for applications originally designed for the PCA8550DBR?

A: The SN74LV157ADBR provides functional multiplexing capability with different circuit architecture. Suitability depends on whether the application can accommodate the 4 x 2:1 topology and whether the expanded electrical specifications (higher voltage range, increased output current, extended temperature range) are compatible with the design. Circuit-level evaluation is required.

Q: Are all three parts RoHS compliant?

A: Yes. The PCA8550DBR, PCA8550DB,118, and SN74LV157ADBR are all ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity level.

Q: What is the packaging difference between the PCA8550DB,118 and the other parts?

A: The PCA8550DB,118 is supplied in bulk packaging, while the PCA8550DBR is supplied in tape and reel format. The SN74LV157ADBR is also supplied in tape and reel format. All three parts use the identical 16-SSOP (0.209", 5.30mm Width) case.