RT9819F-40GV Equivalent & Substitute Parts

Part Overview

The RT9819F-40GV is a single-channel power management supervisor IC manufactured by Richtek USA Inc., designed for reset and power-on reset applications. This Surface Mount device operates across the industrial temperature range of -40°C to 85°C and provides push-pull, totem pole output configuration with active high reset signaling. The part is currently in active product status with 866 units available in inventory.

Identification of substitute parts becomes necessary when the primary part experiences supply constraints, extended lead times, or when design requirements permit functional equivalents that meet the same electrical and mechanical specifications.

Substiute Parts

RT9819F-40GV

Richtek USA Inc.In Stock: 936RT9819F-40GV Datasheet

Current PartRFQ

MAX6800UR40D3+T

Analog Devices Inc./Maxim IntegratedIn Stock: 1549MAX6800UR40D3+T Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RT9819F-40GV is determined by strict alignment of the following critical parameters:

• Package Compatibility: Both parts must use SOT-23-3 (TO-236-3, SC-59) surface mount packaging to ensure PCB footprint compatibility
• Functional Type: Single-channel simple reset/power-on reset supervisor with push-pull, totem pole output
• Voltage Threshold: 4V monitoring threshold for reset trigger determination
• Reset Logic: Active high reset output configuration
• Mounting Technology: Surface mount assembly compatibility
• Regulatory Compliance: ROHS3 compliance and EAR99 ECCN classification

The MAX6800UR40D3+T qualifies as a substitute part based on matching all critical electrical and mechanical parameters. Differences in reset timeout specification (100ms minimum versus 35ms minimum) and operating temperature range extension do not preclude substitution when the application design accommodates these variations.

Parameter Comparison

Engineering Selection Recommendations

The RT9819F-40GV remains the primary selection for new designs due to its active product status and current manufacturing availability. The part meets all regulatory requirements including ROHS3 compliance and carries EAR99 ECCN classification.

The MAX6800UR40D3+T serves as a functional equivalent when supply of the primary part is unavailable. This substitute maintains identical electrical performance for the core reset supervision function and shares the same package footprint. The extended operating temperature range (-40°C to 125°C versus -40°C to 85°C) and improved moisture sensitivity rating (MSL 1 versus MSL 3) represent performance enhancements. However, the longer reset timeout specification (100ms minimum versus 35ms minimum) requires circuit-level verification to confirm compatibility with the application's reset timing requirements. The obsolete product status of the MAX6800UR40D3+T indicates limited future availability.

Frequently Asked Questions (FAQ)

Q: Can the MAX6800UR40D3+T be used as a direct replacement for the RT9819F-40GV?

A: The MAX6800UR40D3+T shares identical package footprint (SOT-23-3), voltage threshold (4V), output configuration (push-pull, totem pole), and reset logic (active high). Substitution is electrically and mechanically compatible. The reset timeout difference (100ms versus 35ms) must be evaluated against application timing requirements.

Q: What are the key differences between these two parts?

A: The primary differences are reset timeout specification (RT9819F-40GV: 35ms minimum; MAX6800UR40D3+T: 100ms minimum), operating temperature range (RT9819F-40GV: -40°C to 85°C; MAX6800UR40D3+T: -40°C to 125°C), moisture sensitivity level (RT9819F-40GV: MSL 3; MAX6800UR40D3+T: MSL 1), and product status (RT9819F-40GV: Active; MAX6800UR40D3+T: Obsolete).

Q: Are both parts RoHS compliant?

A: Yes, both the RT9819F-40GV and MAX6800UR40D3+T are ROHS3 compliant and carry EAR99 ECCN classification.

Q: Does the extended temperature range of the MAX6800UR40D3+T affect substitution suitability?

A: The extended operating temperature range of the MAX6800UR40D3+T (-40°C to 125°C) does not restrict substitution. Applications operating within the RT9819F-40GV temperature range (-40°C to 85°C) will function within the MAX6800UR40D3+T specifications.

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

A: The RT9819F-40GV carries MSL 3 (168 hours maximum floor life), while the MAX6800UR40D3+T carries MSL 1 (unlimited floor life). The MAX6800UR40D3+T offers superior moisture handling characteristics and reduced sensitivity to storage conditions.

Q: Should reset timeout differences be considered in circuit design?

A: Yes. The RT9819F-40GV specifies 35ms minimum reset timeout, while the MAX6800UR40D3+T specifies 100ms minimum. Applications with timing-critical reset sequences must verify that the longer timeout of the substitute part does not conflict with system initialization requirements.