RT9818D-12GV Equivalent & Substitute Parts

Part Overview

The RT9818D-12GV is a single-channel supervisor IC manufactured by Richtek USA Inc., designed for power management applications. This Surface Mount device operates as a Simple Reset/Power-On Reset supervisor with an open drain or open collector output configuration. The part is currently in Active product status with 870 pieces available in new original inventory.

Identifying equivalent and substitute parts for the RT9818D-12GV becomes necessary when addressing supply chain constraints, inventory availability, or specific application requirements that align with alternative supervisor ICs meeting identical electrical and mechanical specifications.

Substiute Parts

RT9818D-12GV

Richtek USA Inc.In Stock: 922RT9818D-12GV Datasheet

Current PartRFQ

NCP803SN120T1G

onsemiIn Stock: 17137NCP803SN120T1G Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RT9818D-12GV is determined by strict alignment across the following critical parameters:

• Single-channel voltage monitoring configuration
• 1.2V voltage threshold specification
• Open drain or open collector output topology
• Active Low reset polarity
• SOT-23-3 package form factor
• Surface mount mounting type
• ROHS3 compliance and REACH unaffected status

The NCP803SN120T1G from onsemi meets all core electrical and mechanical substitution criteria. Both devices function as single-channel supervisors with identical voltage thresholds, output configurations, reset polarity, and package specifications. Compliance certifications align across both parts.

Parameter Comparison

Engineering Selection Recommendations

The RT9818D-12GV maintains Active product status with established supply availability. The NCP803SN120T1G functions as an electrical and mechanical equivalent but carries Obsolete product status, indicating discontinued manufacturing and limited future availability.

Both parts satisfy ROHS3 compliance and REACH unaffected requirements. The NCP803SN120T1G demonstrates superior moisture sensitivity characteristics (MSL 1 versus MSL 3) and extended operating temperature range (-40°C to 105°C versus -40°C to 85°C). The RT9818D-12GV specifies a longer reset timeout period (292ms minimum versus 140ms minimum).

For new designs and applications requiring long-term component availability, the RT9818D-12GV is the preferred selection. The NCP803SN120T1G remains functionally compatible for existing applications where supply constraints necessitate substitution, provided that the shorter reset timeout and extended temperature range do not conflict with system requirements.

Frequently Asked Questions (FAQ)

Q: Can the NCP803SN120T1G directly replace the RT9818D-12GV in existing designs?

A: Yes, from an electrical and mechanical standpoint. Both devices share identical voltage thresholds (1.2V), output configurations (open drain/open collector), reset polarity (active low), and package specifications (SOT-23-3). However, the NCP803SN120T1G has a shorter reset timeout (140ms minimum versus 292ms minimum), which may affect timing-sensitive applications.

Q: What is the significance of the different reset timeout values?

A: The reset timeout defines the minimum duration the reset output remains asserted after power supply stabilization. The RT9818D-12GV specifies 292ms minimum, while the NCP803SN120T1G specifies 140ms minimum. Applications requiring extended reset assertion periods must account for this difference.

Q: Why does the NCP803SN120T1G have Obsolete product status?

A: Obsolete status indicates the manufacturer has discontinued production. While existing inventory may be available, future procurement cannot be guaranteed. The RT9818D-12GV, with Active status, represents the current production alternative.

Q: Are the moisture sensitivity levels interchangeable?

A: The RT9818D-12GV specifies MSL 3 (168 hours), while the NCP803SN120T1G specifies MSL 1 (unlimited). MSL 1 provides superior moisture tolerance and longer shelf life without baking requirements. Applications in high-humidity environments benefit from the NCP803SN120T1G's superior moisture characteristics.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the RT9818D-12GV and NCP803SN120T1G are ROHS3 compliant and REACH unaffected, satisfying equivalent regulatory requirements.

Q: What is the operating temperature difference between these parts?

A: The RT9818D-12GV operates from -40°C to 85°C (TA), while the NCP803SN120T1G operates from -40°C to 105°C (TJ). Applications requiring operation above 85°C benefit from the NCP803SN120T1G's extended temperature range.