RT9819C-29GV Equivalent & Substitute Parts

Part Overview

The RT9819C-29GV is a single-channel power management supervisor IC manufactured by Richtek USA Inc., designed for reset and power-on reset applications. This device operates as a push-pull, totem pole output supervisor with active-low reset functionality. The part is currently in active product status with 20,498 units in stock.

Substitute parts become necessary when the RT9819C-29GV reaches end-of-life status, experiences supply constraints, or when design requirements permit operation within the electrical parameter tolerances of alternative supervisors. The substitute parts listed maintain functional equivalence through matching package type, output configuration, and core electrical characteristics.

Substiute Parts

RT9819C-29GV

Richtek USA Inc.In Stock: 20597RT9819C-29GV Datasheet

Current PartRFQ

CAT809STBI-GT3

onsemiIn Stock: 95367CAT809STBI-GT3 Datasheet

DirectRFQ

CAT809TTBI-GT3

onsemiIn Stock: 71301CAT809TTBI-GT3 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RT9819C-29GV is determined by the following critical parameters:

Package Compatibility: All substitute parts must use the SOT-23-3 package (TO-236-3, SC-59) to ensure mechanical and electrical pin compatibility without PCB redesign.

Functional Equivalence: Substitute parts must operate as single-channel supervisors with push-pull, totem pole output configuration and active-low reset logic.

Voltage Threshold Tolerance: The RT9819C-29GV monitors at 2.9V. Substitute parts with voltage thresholds within the range of 2.93V to 3.08V are acceptable for applications where the threshold variation does not impact system reset behavior.

Reset Timeout: Substitute parts must provide reset timeout values of 140ms minimum or greater, maintaining timing compatibility with the original specification of 143ms minimum.

Operating Temperature Range: All substitute parts must support the full -40°C to 85°C operating temperature range.

Regulatory Compliance: All substitute parts must maintain ROHS3 compliance and REACH unaffected status.

The two substitute parts identified—CAT809STBI-GT3 and CAT809TTBI-GT3—meet these criteria despite their obsolete product status.

Parameter Comparison

Engineering Selection Recommendations

RT9819C-29GV (Primary Selection): This part maintains active product status with substantial inventory availability (20,498 units). It is the preferred choice for new designs and ongoing production due to its current lifecycle status and ROHS3 compliance.

CAT809STBI-GT3 (Secondary Selection): This onsemi supervisor provides the closest voltage threshold match at 2.93V, representing a 0.03V deviation from the RT9819C-29GV specification. The part is obsolete but maintains high inventory levels (95,300 units). The MSL rating of 1 (Unlimited) provides superior moisture handling compared to the primary part. This substitute is suitable for applications where the threshold tolerance is acceptable and supply of the primary part is constrained.

CAT809TTBI-GT3 (Tertiary Selection): This onsemi supervisor operates at a higher voltage threshold of 3.08V, representing a 0.18V deviation from the RT9819C-29GV specification. The part is obsolete with inventory of 71,200 units. The MSL rating of 1 (Unlimited) provides superior moisture handling. This substitute is applicable only in designs where the higher threshold voltage does not compromise system reset behavior.

All substitute parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with the original part.

Frequently Asked Questions (FAQ)

Q: Can CAT809STBI-GT3 be used as a direct replacement for RT9819C-29GV?

A: CAT809STBI-GT3 is functionally equivalent within the specified electrical parameters. Both parts operate as single-channel supervisors in SOT-23-3 packages with push-pull, totem pole output and active-low reset logic. The voltage threshold difference of 0.03V (2.93V vs. 2.9V) is within acceptable tolerance for most applications. However, the part is obsolete; verify long-term availability before committing to production use.

Q: What is the significance of the voltage threshold difference between RT9819C-29GV (2.9V) and CAT809TTBI-GT3 (3.08V)?

A: The voltage threshold determines the supply voltage level at which the supervisor triggers a reset signal. A 0.18V difference may impact system behavior if the design operates near the threshold boundary. CAT809TTBI-GT3 is suitable only for applications where this higher threshold does not prevent proper reset operation under minimum supply voltage conditions.

Q: Why do the substitute parts have lower Moisture Sensitivity Level (MSL) ratings?

A: CAT809STBI-GT3 and CAT809TTBI-GT3 both carry MSL ratings of 1 (Unlimited), compared to the RT9819C-29GV rating of 3 (168 Hours). A lower MSL rating indicates superior moisture resistance and longer shelf life without baking. This is a favorable characteristic for storage and handling, though it does not affect functional performance in the application.

Q: Are all substitute parts available in Cut Tape (CT) packaging?

A: Yes. RT9819C-29GV is available in Cut Tape (CT) and Digi-Reel® packaging. CAT809STBI-GT3 and CAT809TTBI-GT3 are both available in Cut Tape (CT) packaging, ensuring compatibility with standard component handling and assembly processes.

Q: Do the substitute parts maintain the same operating temperature range?

A: Yes. All three parts—RT9819C-29GV, CAT809STBI-GT3, and CAT809TTBI-GT3—operate across the full -40°C to 85°C temperature range, ensuring thermal compatibility across industrial and commercial applications.

Q: What is the impact of the reset timeout difference (143ms vs. 140ms)?

A: The reset timeout specifies the minimum duration the reset signal remains active after a power-on or supply voltage recovery event. The 3ms difference between RT9819C-29GV (143ms minimum) and the substitute parts (140ms minimum) is negligible for most applications. Both values exceed typical microcontroller reset requirements.