RT8252BLGSP Equivalent & Substitute Parts

Part Overview

The RT8252BLGSP is a buck switching regulator IC manufactured by Richtek USA Inc., designed for positive adjustable output applications with 2A output current capability. This device operates across a 4.5V to 23V input voltage range and supports adjustable output from 0.8V to 20V, making it suitable for various power management applications requiring step-down conversion with synchronous rectification.

The RT8252BLGSP is classified as obsolete, necessitating identification of functionally equivalent alternatives for new designs and ongoing production support. Substitute parts must maintain compatibility across critical electrical parameters including input voltage range, output voltage adjustability, output current capacity, and package form factor.

Substiute Parts

RT8252BLGSP

Richtek USA Inc.In Stock: 663RT8252BLGSP Datasheet

Current PartRFQ

TPS54340DDAR

Texas InstrumentsIn Stock: 20704TPS54340DDAR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the RT8252BLGSP is determined by the following critical parameters:

• Input voltage range compatibility: Substitute must support minimum 4.5V input and accommodate the original 23V maximum specification
• Output voltage adjustability: Substitute must support 0.8V minimum output with adjustable range capability
• Output current rating: Substitute must meet or exceed 2A output current requirement
• Package compatibility: Substitute must utilize 8-pin SOIC form factor with 0.154" (3.90mm) width to ensure PCB layout compatibility
• Topology: Substitute must employ buck (step-down) switching regulator topology with positive output configuration

The TPS54340DDAR from Texas Instruments qualifies as a functional substitute based on these parameters. While the TPS54340DDAR provides enhanced specifications in certain areas (higher output current at 4.6A, extended input voltage range to 42V, and wider output voltage range to 41.1V), it maintains full backward compatibility with the RT8252BLGSP across all minimum required parameters.

Parameter Comparison

Engineering Selection Recommendations

The TPS54340DDAR serves as a direct functional substitute for the RT8252BLGSP in applications requiring buck regulation with adjustable positive output. Both devices are classified with limited product status (Obsolete and Not For New Designs respectively), indicating reduced manufacturer support and potential long-term availability constraints.

Selection of the TPS54340DDAR is supported by:

• Full parameter compatibility across minimum input voltage (4.5V), minimum output voltage (0.8V), and package form factor (8-pin SOIC, 0.154" width)
• Enhanced electrical specifications providing design margin: 4.6A output current versus 2A requirement, 42V maximum input versus 23V specification, and 41.1V maximum output versus 20V specification
• Extended operating temperature range (-40°C to 150°C junction temperature) providing thermal performance advantage
• RoHS3 compliance and REACH unaffected status matching regulatory requirements of the original part
• Identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications for export and tariff purposes

Design considerations include the absence of synchronous rectification in the TPS54340DDAR compared to the RT8252BLGSP, which may affect efficiency in specific low-voltage, high-current applications. Additionally, the TPS54340DDAR switching frequency range (100kHz to 2.5MHz) encompasses the RT8252BLGSP fixed 1.2MHz frequency, allowing frequency optimization for specific application requirements.

Frequently Asked Questions (FAQ)

Q: Can the TPS54340DDAR directly replace the RT8252BLGSP without PCB modifications?

A: The TPS54340DDAR maintains compatible 8-pin SOIC package dimensions (0.154", 3.90mm width), enabling direct footprint compatibility. However, pin-level functional verification is required, as internal architecture differences may necessitate feedback network adjustments for output voltage regulation.

Q: What is the impact of the TPS54340DDAR lacking synchronous rectification compared to the RT8252BLGSP?

A: Synchronous rectification improves efficiency by replacing the body diode with a low-resistance MOSFET. The absence of this feature in the TPS54340DDAR results in higher conduction losses, particularly in low-voltage output applications. Efficiency impact is application-dependent and should be evaluated through thermal analysis and power dissipation calculations.

Q: Are both the RT8252BLGSP and TPS54340DDAR suitable for new designs?

A: Neither device is recommended for new designs. The RT8252BLGSP is classified as Obsolete, while the TPS54340DDAR is classified as Not For New Designs. Both represent legacy components with limited manufacturer support. New designs should evaluate current-generation buck regulator offerings from active product lines.

Q: What are the compliance and regulatory differences between these parts?

A: Both devices share identical ECCN (EAR99), HTSUS (8542.39.0001), and REACH Unaffected status. The TPS54340DDAR carries RoHS3 compliance certification, while the RT8252BLGSP compliance status is not specified in available documentation. Both devices are suitable for applications with equivalent regulatory requirements.

Q: How do the switching frequency specifications affect circuit design?

A: The RT8252BLGSP operates at fixed 1.2MHz, while the TPS54340DDAR provides a programmable range of 100kHz to 2.5MHz. This flexibility allows optimization of output filter component sizing and EMI characteristics. Applications requiring fixed-frequency operation must configure the TPS54340DDAR accordingly through external frequency-setting components.

Q: What inventory and availability considerations apply to these parts?

A: The RT8252BLGSP shows 642 pieces in stock as new original inventory. The TPS54340DDAR shows significantly higher availability at 20,600 pieces in stock. Given the obsolete status of the RT8252BLGSP, the TPS54340DDAR represents a more reliable long-term sourcing option for ongoing production requirements.