RT8258GE Equivalent & Substitute Parts

Part Overview

The RT8258GE is a buck switching regulator IC manufactured by Richtek USA Inc., designed for positive adjustable output applications. This Surface Mount device operates across a 4.5V to 24V input range with adjustable output from 0.8V to 15V at 1.2A maximum output current. The part is currently in Active product status with 19,328 units in stock. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility exist, enabling design flexibility and supply chain alternatives.

Substiute Parts

RT8258GE

Richtek USA Inc.In Stock: 19394RT8258GE Datasheet

Current PartRFQ

MP2359DT-LF-P

Monolithic Power SystemsIn Stock: 6408MP2359DT-LF-P Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RT8258GE is determined by strict alignment of the following critical parameters:

• Input voltage range: 4.5V minimum to 24V maximum
• Output voltage adjustability: 0.8V minimum to 15V maximum
• Output current capability: 1.2A
• Package type: SOT-23-6 Surface Mount
• Topology: Buck (Step-Down) switching regulator
• Output configuration: Positive adjustable
• Operating temperature range: -40°C to 85°C

The MP2359DT-LF-P from Monolithic Power Systems meets all substitution criteria. Both devices share identical input/output voltage ranges, equivalent current ratings, matching package specifications, and compatible operating temperature ranges. Differences in switching frequency (700kHz vs. 1.4MHz) and moisture sensitivity level do not preclude substitution when electrical and mechanical requirements are satisfied.

Parameter Comparison

Engineering Selection Recommendations

The RT8258GE is the primary selection for new designs, maintaining Active product status with established supply availability (19,328 units in stock). The MP2359DT-LF-P serves as a qualified substitute when supply constraints or design timeline requirements necessitate an alternative. The MP2359DT-LF-P carries a "Not For New Designs" status, indicating it is suitable for replacement or legacy applications but not recommended as the initial design choice.

Both devices are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements. Selection between these parts should prioritize the RT8258GE for new development. The MP2359DT-LF-P remains electrically and mechanically compatible for existing designs requiring component replacement or supply diversification.

Frequently Asked Questions (FAQ)

Q: Can the MP2359DT-LF-P directly replace the RT8258GE in an existing design?

A: Yes. Both devices share identical input voltage ranges (4.5V–24V), output voltage adjustability (0.8V–15V), current ratings (1.2A), and SOT-23-6 packaging. The output voltage minimum differs by 0.01V (0.8V vs. 0.81V), which is negligible for adjustable regulator applications. Pin-compatible operation is supported.

Q: What is the significance of the different switching frequencies?

A: The RT8258GE operates at 700kHz while the MP2359DT-LF-P operates at 1.4MHz. Higher switching frequency reduces output filter component size but may increase switching losses. This difference does not prevent substitution but should be considered in PCB layout and thermal design if component footprints or thermal requirements are critical.

Q: Why is the MP2359DT-LF-P marked "Not For New Designs"?

A: This designation indicates the part is in mature or declining production status. It remains fully functional and compliant but is reserved for replacement applications and legacy support. New designs should prioritize the RT8258GE.

Q: Are there packaging differences between these parts?

A: Both devices use SOT-23-6 Surface Mount packaging. The RT8258GE is supplied in Cut Tape (CT) and Digi-Reel format, while the MP2359DT-LF-P is supplied in Tape & Reel (TR) format. These are standard packaging variations and do not affect electrical compatibility.

Q: What is the moisture sensitivity difference?

A: The RT8258GE has MSL 3 (168 hours), while the MP2359DT-LF-P has MSL 1 (Unlimited). MSL 1 indicates superior moisture resistance. This difference does not affect substitution but may influence storage and handling procedures in high-humidity environments.