QLS25ZE Equivalent & Substitute Parts Reference

Part Overview

The QLS25ZE is an isolated module DC-DC converter manufactured by Bel Power Solutions, designed to deliver 3.3V at 25A output from a 36V to 75V input range, with 83W power capacity. This component is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for ITE (Commercial) applications. Substitute parts must satisfy identical input voltage range, output voltage specification, isolation rating, and mounting configuration to ensure direct replacement capability.

Substiute Parts

QLS25ZE

Bel Power SolutionsIn Stock: 790QLS25ZE Datasheet

Current PartRFQ

CHB150-48S33

Cincon Electronics Co. LTDIn Stock: 1108CHB150-48S33 Datasheet

MFR RecommendedRFQ

ICH15048S3V3

XP PowerIn Stock: 1089ICH15048S3V3 Datasheet

MFR RecommendedRFQ

QSB35048S3V3

XP PowerIn Stock: 803QSB35048S3V3 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict alignment with the following critical parameters:

Mandatory Matching Criteria:

• Input voltage range: 36V minimum to 75V maximum
• Output voltage: 3.3V
• Isolation voltage: 1.5 kV
• Mounting type: Through Hole
• Number of outputs: 1
• Control features: Enable, Active High
• Applications: ITE (Commercial)
• RoHS3 compliance

Acceptable Variation Parameters:

• Current output capacity: Equal to or greater than 25A
• Power rating: Equal to or greater than 83W
• Efficiency: May vary
• Package form factor: Half Brick or DIP Module configurations acceptable
• Operating temperature: Must support -40°C to 100°C minimum
• Product status: Active preferred for long-term availability

Three substitute parts meet these criteria: CHB150-48S33 (Cincon Electronics), ICH15048S3V3 (XP Power), and QSB35048S3V3 (XP Power). All three maintain identical input/output voltage specifications, isolation rating, and control architecture while offering increased current capacity and power ratings.

Parameter Comparison

Engineering Selection Recommendations

CHB150-48S33 Selection Criteria: CHB150-48S33 is suitable for direct replacement in applications where the 25A output current requirement can be satisfied by the 30A capability. This part maintains identical electrical specifications while offering 99W power capacity. Active product status ensures long-term availability and supply chain continuity. Half Brick package form factor requires PCB layout verification for mechanical fit within existing mounting footprints. CE and cURus approvals provide additional regulatory compliance documentation.

ICH15048S3V3 Selection Criteria: ICH15048S3V3 provides equivalent electrical performance with 30A output capacity and 99W power rating. XP Power manufacturing ensures established supply chain presence. 9-DIP Module package configuration differs from the original 8-DIP specification; physical dimensions (61.0mm x 57.9mm x 12.7mm) require board layout confirmation. Active product status supports long-term procurement. Lower efficiency rating (79%) compared to QLS25ZE (89%) may impact thermal management in high-ambient-temperature environments.

QSB35048S3V3 Selection Criteria: QSB35048S3V3 offers significant current capacity margin (70A) and power headroom (350W), suitable for applications requiring future load expansion or thermal margin. Identical electrical interface and control architecture enable functional compatibility. 9-DIP Module package requires mechanical fit verification. Active product status and XP Power manufacturing support supply continuity. Efficiency rating (89%) matches the original part, minimizing thermal design changes.

Product Status Consideration: All three substitute parts maintain Active product status, ensuring availability for new designs and ongoing production. The QLS25ZE obsolete classification necessitates transition to one of these alternatives for continued component sourcing.

Frequently Asked Questions (FAQ)

Q: Can CHB150-48S33 directly replace QLS25ZE in existing designs? A: CHB150-48S33 satisfies all electrical requirements (36-75V input, 3.3V output, 1.5kV isolation, Enable/Active High control). Mechanical compatibility requires verification of Half Brick package dimensions (61.0mm x 57.9mm x 12.7mm) against the original 8-DIP Module footprint (57.9mm x 36.8mm x 11.0mm). PCB layout modification may be necessary.

Q: What is the difference between ICH15048S3V3 and QSB35048S3V3? A: Both are XP Power products with identical input/output voltage and isolation specifications. ICH15048S3V3 delivers 30A at 99W with 79% efficiency in a 9-DIP Module package. QSB35048S3V3 delivers 70A at 350W with 89% efficiency in a 9-DIP Module package. Selection depends on current requirement and thermal design constraints.

Q: Are all substitute parts RoHS3 compliant? A: Yes. QLS25ZE, CHB150-48S33, ICH15048S3V3, and QSB35048S3V3 are all ROHS3 Compliant with Moisture Sensitivity Level 1 (Unlimited).

Q: What mounting considerations apply to these substitutes? A: All parts use Through Hole mounting. CHB150-48S33 employs Half Brick package (61.0mm x 57.9mm x 12.7mm). ICH15048S3V3 and QSB35048S3V3 use 9-DIP Module packages (61.0mm x 57.9mm x 12.7mm and 13.2mm height respectively). Original QLS25ZE uses 8-DIP Module (57.9mm x 36.8mm x 11.0mm). Board layout verification is required for all substitutions.

Q: Do all substitutes support the same control interface? A: Yes. All substitute parts feature Enable control with Active High logic, matching the QLS25ZE specification.

Q: Which substitute offers the best efficiency match? A: QSB35048S3V3 matches the QLS25ZE efficiency rating at 89%. CHB150-48S33 operates at 82% efficiency, and ICH15048S3V3 at 79%. For thermally constrained applications, QSB35048S3V3 provides equivalent thermal performance.