DST7-24B55 Equivalent & Substitute Parts

Part Overview

The DST7-24B55 is a 36VA laminated core power transformer manufactured by Pulse Electronics, designed for through-hole mounting applications. It features dual primary windings (115V/230V) and dual secondary windings (parallel 12V/series 24V configuration) with PC pin termination. The product is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance and new design implementations where this transformer specification remains applicable.

Substiute Parts

DST7-24B55

Pulse ElectronicsIn Stock: 886DST7-24B55 Datasheet

Current PartRFQ

DST-7-24

Signal TransformerIn Stock: 1518DST-7-24 Datasheet

DirectRFQ

FS24-1500

Triad MagneticsIn Stock: 1152FS24-1500 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the DST7-24B55 are qualified based on electrical and mechanical parameter equivalence within the following criteria:

Electrical Parameters (Must Match):

• Power rating: 36VA
• Primary voltage options: 115V and 230V
• Secondary voltage configuration: Parallel 12V and series 24V
• Output current capacity: Parallel 3A and series 1.5A
• Primary and secondary winding configuration: Dual windings
• Isolation voltage: 2500Vrms
• Core type: Laminated

Mechanical Parameters (Must Match):

• Mounting type: Through hole
• Termination style: PC pin
• Physical dimensions: Within tolerance of 66.80mm L × 55.63mm W × 39.62mm H (seated)

Compliance Parameters:

• RoHS compliance status
• REACH compliance status
• ECCN and HTSUS classifications

The DST-7-24 (Signal Transformer) and FS24-1500 (Triad Magnetics) meet all specified electrical and mechanical requirements and are therefore direct functional equivalents.

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts are functionally equivalent to the DST7-24B55 and meet all specified electrical and mechanical requirements. Selection between DST-7-24 and FS24-1500 should be based on the following factors:

DST-7-24 (Signal Transformer): This part maintains active product status with 1462 units in stock. It carries ROHS3 compliance certification and is packaged in box format. The maximum seated height is 40.40mm, which is 0.78mm greater than the original part.

FS24-1500 (Triad Magnetics): This part also maintains active product status with 1054 units in stock. It carries ROHS3 compliance certification and is packaged in box format. The maximum seated height is 39.67mm, which is 0.05mm greater than the original part, providing closer dimensional alignment.

Both parts share identical electrical specifications, isolation voltage, winding configurations, and compliance certifications. Physical dimension variations are within typical manufacturing tolerances for through-hole mounted transformers.

Frequently Asked Questions (FAQ)

Q: Can DST-7-24 or FS24-1500 be used as direct replacements for DST7-24B55?

A: Yes. Both parts meet all electrical and mechanical specifications required for functional equivalence. They feature identical power ratings (36VA), voltage configurations (115V/230V primary, 12V/24V secondary), output current ratings, winding configurations, isolation voltage, and termination styles.

Q: What are the dimensional differences between the substitute parts and the original?

A: The DST-7-24 has a maximum seated height of 40.40mm compared to the original 39.62mm (0.78mm difference). The FS24-1500 has a maximum seated height of 39.67mm (0.05mm difference). Length and width dimensions are within 0.12mm of the original across all parts. These variations are within standard manufacturing tolerances for laminated core transformers.

Q: Are there any compliance differences between the parts?

A: The original DST7-24B55 carries RoHS Compliant status. Both substitute parts carry ROHS3 Compliant status, which represents a more recent compliance standard. All three parts maintain REACH Unaffected status and share identical ECCN (EAR99) and HTSUS (8504.31.4035) classifications.

Q: What is the availability status of each part?

A: The DST7-24B55 is classified as obsolete with 871 units in stock. The DST-7-24 is active with 1462 units in stock. The FS24-1500 is active with 1054 units in stock. Active status parts provide better long-term availability for ongoing procurement.

Q: Do the substitute parts have the same packaging?

A: The original DST7-24B55 is packaged with a dash designation. Both substitute parts are packaged in box format. Packaging format should be verified against specific assembly and storage requirements.