RT7322ELGSP LED Driver IC Equivalent & Substitute Parts

Part Overview

The RT7322ELGSP is a linear LED driver IC manufactured by Richtek USA Inc., designed for single-output LED lighting applications with a fixed 20mA output current. This Surface Mount device operates across a wide supply voltage range of 1V to 90V and is housed in an 8-SOP-EP package with exposed pad. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Substiute Parts

RT7322ELGSP

Richtek USA Inc.In Stock: 850RT7322ELGSP Datasheet

Current PartRFQ

BCR401WH6327XTSA1

Infineon TechnologiesIn Stock: 959BCR401WH6327XTSA1 Datasheet

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CL520N3-G

Microchip TechnologyIn Stock: 2315CL520N3-G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the RT7322ELGSP is determined by the following critical parameters:

Primary Substitution Criteria:

• Single output LED driver topology
• Linear driver architecture with internal switching capability
• Output current capability of 20mA (exact match) or higher
• Supply voltage range compatibility (minimum 1V, maximum 90V or higher)
• Surface mount packaging suitable for PCB integration
• RoHS3 compliance and REACH unaffected status

Identified Substitute Parts:

The CL520N3-G (Microchip Technology) qualifies as a direct functional equivalent, matching the 20mA output current specification and supporting the full 1V to 90V supply voltage range. This part maintains identical electrical performance while offering active product status and unlimited MSL rating.

The BCR401WH6327XTSA1 (Infineon Technologies) functions as a higher-current alternative with 60mA output capability, suitable for applications requiring increased LED current capacity. However, this part operates within a reduced supply voltage range (1.2V to 18V), limiting its applicability to lower-voltage LED systems.

Parameter Comparison

Engineering Selection Recommendations

CL520N3-G (Microchip Technology) - Recommended Primary Substitute

The CL520N3-G provides the closest functional match to the RT7322ELGSP. Both devices deliver identical 20mA output current and support the full 1V to 90V supply voltage range. The CL520N3-G maintains active product status, ensuring long-term availability and supply chain stability. This part carries ROHS3 compliance and unlimited MSL rating, improving handling and storage flexibility compared to the original part's MSL-3 classification. The primary design consideration is the transition from Surface Mount (8-SOIC) to Through Hole (TO-92-3) packaging, which requires PCB layout modification but presents no electrical incompatibility.

BCR401WH6327XTSA1 (Infineon Technologies) - Higher-Current Alternative

The BCR401WH6327XTSA1 serves applications requiring increased LED current capacity at 60mA output. This part maintains active product status and Surface Mount compatibility (SOT-343 package). However, the reduced supply voltage range (1.2V to 18V maximum) restricts its use to lower-voltage LED systems and eliminates compatibility with designs requiring the full 90V upper limit of the original specification. Selection of this part is appropriate only when LED current requirements exceed 20mA and system voltage remains within the 1.2V to 18V envelope.

Both substitute parts satisfy RoHS3 compliance and REACH unaffected requirements, ensuring regulatory alignment with the original design.

Frequently Asked Questions (FAQ)

Q: Can the CL520N3-G directly replace the RT7322ELGSP without circuit modification?

A: The CL520N3-G provides electrical equivalence in output current (20mA) and supply voltage range (1V to 90V). However, packaging differs: the original uses 8-SOIC Surface Mount while the CL520N3-G uses TO-92-3 Through Hole. PCB layout and assembly process modifications are required. Functional circuit operation remains unchanged.

Q: What is the primary limitation of the BCR401WH6327XTSA1 as a substitute?

A: The BCR401WH6327XTSA1 operates within a maximum supply voltage of 18V, compared to the RT7322ELGSP's 90V maximum. This part is unsuitable for applications requiring the full original voltage range. Selection is appropriate only for systems operating at 18V or below.

Q: Are both substitute parts RoHS3 compliant?

A: Yes. Both the CL520N3-G and BCR401WH6327XTSA1 carry ROHS3 compliance certification, matching the regulatory status of the original RT7322ELGSP.

Q: What is the MSL (Moisture Sensitivity Level) difference between the original and substitutes?

A: The RT7322ELGSP carries MSL-3 (168 hours), requiring controlled storage and handling. Both substitute parts carry MSL-1 (unlimited), eliminating moisture sensitivity constraints and simplifying inventory management and assembly processes.

Q: Does the CL520N3-G support dimming functionality?

A: The CL520N3-G specification does not indicate dimming capability. The original RT7322ELGSP explicitly specifies no dimming. Both parts function as fixed-current LED drivers without dimming control.

Q: Which substitute is recommended for new designs?

A: The CL520N3-G is recommended for designs requiring direct electrical equivalence to the RT7322ELGSP. The BCR401WH6327XTSA1 is appropriate only when higher LED current (60mA) is required and system voltage remains within 1.2V to 18V limits.