DST5-56B35 Equivalent & Substitute Parts

Part Overview

The DST5-56B35 is a laminated core power transformer manufactured by Pulse Electronics, rated at 12VA with dual primary and secondary windings. This through-hole mounted component operates at 115V or 230V primary voltage with configurable secondary output (28V parallel or 56V series), delivering up to 440mA in parallel mode or 220mA in series mode. The part is RoHS compliant and maintains 2500Vrms isolation voltage. As an active product with 932 units in stock, equivalent alternatives are available for applications requiring component substitution due to supply constraints, design flexibility, or regional availability.

Substiute Parts

DST5-56B35

Pulse ElectronicsIn Stock: 980DST5-56B35 Datasheet

Current PartRFQ

3FD-556

TamuraIn Stock: 8103FD-556 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DST5-56B35 is determined by strict equivalence across the following critical parameters:

• Power Rating: 12VA maximum
• Primary Voltage Configuration: Dual primary windings supporting 115V and 230V operation
• Secondary Voltage Output: Dual secondary windings with parallel 28V and series 56V capability
• Output Current Capacity: Parallel mode 440mA maximum; series mode 220mA maximum
• Core Type: Laminated construction
• Mounting and Termination: Through-hole mounting with PC pin termination
• Electrical Isolation: 2500Vrms minimum isolation voltage
• Compliance: RoHS compliant status

The Tamura 3FD-556 meets all specified electrical and mechanical parameters, confirming direct substitution capability within the same functional class.

Parameter Comparison

Engineering Selection Recommendations

Both the DST5-56B35 and 3FD-556 are active products with RoHS compliance and equivalent electrical specifications. Selection between these parts should be based on:

DST5-56B35 (Pulse Electronics): Primary choice when inventory availability is critical, with 932 units currently in stock. Dimensions are 47.24mm L x 39.62mm W x 36.58mm H (seated).

3FD-556 (Tamura): Suitable alternative with 706 units available. Physical dimensions are slightly larger at 48.50mm L x 41.52mm W x 38.00mm H (seated), requiring verification of PCB layout clearance. Supplied in tube packaging.

Both parts satisfy identical electrical requirements and isolation specifications. PCB footprint and mounting clearance must be confirmed before substitution, as dimensional variance exists between manufacturers.

Frequently Asked Questions (FAQ)

Q: Can the 3FD-556 directly replace the DST5-56B35 in existing designs?

A: Electrical substitution is valid. Both parts provide identical voltage, current, and power specifications with equivalent isolation ratings. Physical dimensions differ slightly; verify PCB layout accommodates the 3FD-556 footprint (48.50mm L x 41.52mm W x 38.00mm H seated) before implementation.

Q: What are the critical parameters for transformer substitution?

A: Power rating (12VA), primary voltage configuration (115V/230V dual), secondary voltage output (28V parallel, 56V series), output current capacity (440mA parallel, 220mA series), core type (laminated), mounting method (through-hole PC pin), and isolation voltage (2500Vrms) must all match exactly.

Q: Are both parts RoHS compliant?

A: Yes. Both DST5-56B35 and 3FD-556 are RoHS compliant and suitable for applications requiring regulatory compliance.

Q: What is the packaging difference?

A: DST5-56B35 is supplied with standard packaging. 3FD-556 is supplied in tube packaging, which may affect handling and storage procedures.

Q: Do dimensional differences affect circuit performance?

A: Dimensional differences do not affect electrical performance. However, PCB layout must accommodate the larger footprint of the 3FD-556 (1.26mm longer, 1.90mm wider, 1.42mm taller) to ensure proper mounting and clearance.