CAT809MSDI-GT3 Equivalent & Substitute Parts

Part Overview

The CAT809MSDI-GT3 is a single-channel power management supervisor IC manufactured by onsemi, designed for reset and power-on reset applications. This device features push-pull, totem pole output configuration with active low reset control and a 140ms minimum reset timeout. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

CAT809MSDI-GT3

onsemiIn Stock: 956CAT809MSDI-GT3 Datasheet

Current PartRFQ

MAX809SQ438T1G

onsemiIn Stock: 2173MAX809SQ438T1G Datasheet

DirectRFQ

MAX809MEXR+T

Analog Devices Inc./Maxim IntegratedIn Stock: 10175MAX809MEXR+T Datasheet

SimilarRFQ

MIC809MYC3-TR

Microchip TechnologyIn Stock: 1062MIC809MYC3-TR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CAT809MSDI-GT3 are qualified based on the following critical parameters that determine functional and mechanical compatibility:

Core Substitution Criteria:

• Single-channel voltage monitoring with 4.38V threshold
• Push-pull, totem pole output configuration
• Active low reset control
• 140ms minimum reset timeout
• SC-70 / SOT-323 surface mount package
• Moisture Sensitivity Level 1 (Unlimited)
• REACH Unaffected and EAR99 compliance status

The substitute parts are categorized as follows:

Direct Manufacturer Equivalent: MAX809SQ438T1G (onsemi) — identical electrical specifications with extended operating temperature range (-40°C ~ 105°C TJ) and Tape & Reel packaging.

Similar Manufacturer Part: MAX809MEXR+T (Analog Devices Inc./Maxim Integrated) — meets all core electrical and mechanical parameters with extended operating temperature range (-40°C ~ 125°C TA) and active product status.

Parametric Equivalent: MIC809MYC3-TR (Microchip Technology) — matches all critical electrical specifications and package requirements with active product status.

Parameter Comparison

Engineering Selection Recommendations

For Active Product Status Requirement: MAX809MEXR+T and MIC809MYC3-TR are both active products, providing long-term availability and supply chain stability compared to the obsolete CAT809MSDI-GT3. Both parts meet all electrical and mechanical specifications.

For Extended Temperature Range: MAX809MEXR+T supports the widest operating temperature range (-40°C ~ 125°C TA), suitable for applications requiring higher thermal performance margins.

For RoHS3 Compliance: All three substitute parts carry explicit ROHS3 Compliant certification, meeting modern regulatory requirements. The original CAT809MSDI-GT3 does not specify RoHS status.

For Packaging and Inventory: MAX809MEXR+T offers the highest inventory availability (10,095 pcs) with Tape & Reel packaging, supporting high-volume production requirements. MAX809SQ438T1G provides direct onsemi sourcing with 2,100 pcs available. MIC809MYC3-TR offers 1,020 pcs from Microchip Technology.

Frequently Asked Questions (FAQ)

Q: Can MAX809MEXR+T directly replace CAT809MSDI-GT3 in existing designs? A: Yes. MAX809MEXR+T meets all core electrical specifications: 4.38V threshold, push-pull totem pole output, active low reset, 140ms minimum reset timeout, and SC-70 SOT-323 package. The extended operating temperature range (-40°C ~ 125°C) provides additional thermal margin.

Q: What is the difference between the three substitute parts? A: All three parts meet identical electrical and mechanical specifications. MAX809MEXR+T (Analog Devices/Maxim) and MIC809MYC3-TR (Microchip) are active products with long-term availability. MAX809SQ438T1G (onsemi) is obsolete but offers direct manufacturer sourcing. MAX809MEXR+T has the widest temperature range and highest inventory.

Q: Are there package compatibility concerns? A: No. All parts use SC-70 / SOT-323 surface mount packages with identical pinouts and mechanical dimensions. No PCB layout modifications are required.

Q: Do all substitute parts meet compliance requirements? A: Yes. All substitute parts carry ROHS3 Compliant certification, REACH Unaffected status, and EAR99 ECCN classification, matching the regulatory profile of the original part.

Q: Which substitute part should be selected for new designs? A: MAX809MEXR+T is recommended for new designs due to active product status, highest inventory availability, extended operating temperature range, and explicit RoHS3 compliance certification.

Q: Is the operating temperature difference between parts significant? A: The operating temperature ranges differ: CAT809MSDI-GT3 and MIC809MYC3-TR operate to 85°C, MAX809SQ438T1G to 105°C, and MAX809MEXR+T to 125°C. Selection depends on application thermal requirements. For standard industrial applications (-40°C ~ 85°C), all parts are equivalent.