RT9818A-40GV Equivalent & Substitute Parts

Part Overview

The RT9818A-40GV is an active low reset supervisor IC manufactured by Richtek USA Inc., designed for power management applications requiring single-channel voltage monitoring. This Surface Mount device operates across the industrial temperature range of -40°C to 85°C and is ROHS3 compliant. The part is currently in active production status with 20,100 units available in inventory. Substitute parts are identified to provide design flexibility, extended temperature range options, or alternative sourcing when the primary part becomes unavailable.

Substiute Parts

RT9818A-40GV

Richtek USA Inc.In Stock: 20195RT9818A-40GV Datasheet

Current PartRFQ

MIC803-40D2VM3-TR

Microchip TechnologyIn Stock: 2392MIC803-40D2VM3-TR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RT9818A-40GV is determined by the following critical parameters:

• Voltage Threshold: Must be 4V
• Number of Channels: Must be 1 channel
• Output Type: Must be Open Drain or Open Collector
• Reset Logic: Must be Active Low
• Package: Must be SOT-23-3 (TO-236-3, SC-59)
• Mounting Type: Must be Surface Mount
• Compliance: Must maintain ROHS3 and REACH Unaffected status

The MIC803-40D2VM3-TR from Microchip Technology meets all critical substitution criteria. Both parts share identical voltage threshold, channel count, output configuration, reset logic, and package specifications. Differences in reset timeout and operating temperature range do not prevent substitution in applications where the RT9818A-40GV specifications are met.

Parameter Comparison

Engineering Selection Recommendations

Both the RT9818A-40GV and MIC803-40D2VM3-TR are active production parts with ROHS3 compliance and REACH Unaffected status, making either suitable for new designs and production environments.

The RT9818A-40GV is the primary selection when operating temperature requirements are limited to -40°C to 85°C and reset timeout specifications require 0ms typical response.

The MIC803-40D2VM3-TR is the appropriate substitute when extended operating temperature range (-40°C to 125°C) is required or when lower moisture sensitivity (MSL 1 vs. MSL 3) is beneficial for storage and handling conditions. The 20ms minimum reset timeout of the MIC803 is compatible with applications where the RT9818A-40GV's 0ms typical timeout is not a critical design constraint.

Frequently Asked Questions (FAQ)

Q: Can the MIC803-40D2VM3-TR directly replace the RT9818A-40GV in existing designs?

A: Yes, the MIC803-40D2VM3-TR is a direct substitute. Both parts share identical voltage threshold (4V), single-channel configuration, Open Drain output, Active Low reset logic, and SOT-23-3 package. Pin-to-pin compatibility is maintained.

Q: What is the difference in reset timeout between these parts?

A: The RT9818A-40GV specifies 0ms typical reset timeout, while the MIC803-40D2VM3-TR specifies 20ms minimum. Applications requiring faster reset response should retain the RT9818A-40GV. Applications with less stringent timing requirements can use either part.

Q: Why does the MIC803 have a higher operating temperature range?

A: The MIC803-40D2VM3-TR is rated to 125°C (TJ), compared to 85°C (TA) for the RT9818A-40GV. This extended range provides design margin for applications in elevated ambient or junction temperature environments.

Q: What does MSL 3 versus MSL 1 mean for component handling?

A: MSL 3 (168 Hours) indicates the RT9818A-40GV requires reflow within 168 hours of moisture exposure. MSL 1 (Unlimited) for the MIC803-40D2VM3-TR has no time restriction. For high-volume or long-lead-time procurement, the MIC803 offers greater handling flexibility.

Q: Are both parts available in the same packaging format?

A: Yes. Both use SOT-23-3 package (also designated TO-236-3 or SC-59). The MIC803-40D2VM3-TR is supplied in Tape & Reel format, while the RT9818A-40GV packaging format is not specified in available data.