RT9818C-33GVL Equivalent & Substitute Parts

Part Overview

The RT9818C-33GVL is a single-channel power management supervisor IC manufactured by Richtek USA Inc., designed for reset and power-on reset applications. This device monitors a 3.3V threshold voltage and provides an active-low open-drain output signal. The component is actively produced and maintains full RoHS3 compliance, making it suitable for modern electronic applications requiring voltage supervision and system reset control.

Identifying equivalent and substitute parts is necessary when the primary part experiences supply constraints, extended lead times, or when design flexibility permits component optimization across manufacturing sources while maintaining identical electrical and mechanical performance.

Substiute Parts

RT9818C-33GVL

Richtek USA Inc.In Stock: 1816RT9818C-33GVL Datasheet

Current PartRFQ

APX803L20-33SA-7

Diodes IncorporatedIn Stock: 3397APX803L20-33SA-7 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RT9818C-33GVL is determined by strict equivalence across the following critical parameters:

• Voltage Threshold: Must be 3.3V
• Channel Count: Must be 1 channel
• Output Configuration: Must be open-drain or open-collector
• Reset Polarity: Must be active-low
• Reset Timeout: Must be 143ms minimum
• Operating Temperature: Must support -40°C to 85°C range
• Package: Must be SOT-23-3 (TO-236-3, SC-59) for mechanical and thermal compatibility
• Compliance: Must maintain RoHS3 and REACH compliance status

The APX803L20-33SA-7 manufactured by Diodes Incorporated meets all specified parameters and qualifies as a parametric equivalent substitute.

Parameter Comparison

Engineering Selection Recommendations

Both the RT9818C-33GVL and APX803L20-33SA-7 are active production components with identical electrical specifications and mechanical compatibility. Selection between these parts may be based on:

• Supply Availability: The APX803L20-33SA-7 currently maintains higher inventory levels (3300 pcs vs. 1724 pcs), providing supply chain flexibility.
• Packaging Format: The RT9818C-33GVL is supplied in standard packaging, while the APX803L20-33SA-7 is available in Tape & Reel format, which may optimize manufacturing workflows for high-volume production.
• Compliance Certification: Both parts maintain equivalent RoHS3 and REACH compliance status, ensuring regulatory compatibility in target applications.
• Moisture Sensitivity: The APX803L20-33SA-7 has MSL 1 (Unlimited), compared to MSL 3 (168 Hours) for the RT9818C-33GVL, providing superior moisture tolerance during storage and handling.

Frequently Asked Questions (FAQ)

Q: Can the APX803L20-33SA-7 be used as a direct replacement for the RT9818C-33GVL?

A: Yes. Both parts are parametric equivalents with identical voltage threshold (3.3V), channel count (1), output type (open-drain), reset polarity (active-low), reset timeout (143ms minimum), operating temperature range (-40°C to 85°C), and SOT-23-3 package. No circuit modifications are required.

Q: Are there any differences in package dimensions or pin configuration?

A: No. Both parts use the SOT-23-3 package (TO-236-3, SC-59), which ensures identical PCB footprint, pin spacing, and thermal characteristics. Direct PCB substitution is possible without layout changes.

Q: What is the significance of the MSL rating difference?

A: The APX803L20-33SA-7 has MSL 1 (Unlimited moisture sensitivity level), while the RT9818C-33GVL has MSL 3 (168 hours). MSL 1 indicates superior moisture tolerance and longer shelf life without desiccant storage requirements, which may reduce handling and storage costs in manufacturing environments.

Q: Do both parts meet the same regulatory and compliance standards?

A: Yes. Both the RT9818C-33GVL and APX803L20-33SA-7 are ROHS3 compliant, REACH unaffected, and classified as EAR99 for export control purposes. They share the same HTSUS code (8542.39.0001).

Q: Which part should be selected for new designs?

A: Either part is suitable for new designs. Selection may prioritize the APX803L20-33SA-7 due to higher current inventory availability and superior moisture sensitivity rating, unless specific supply chain agreements or design history favor the RT9818C-33GVL.