LP28-430B117 Equivalent & Substitute Parts

Part Overview

The LP28-430B117 is a 12VA semi-toroidal power transformer manufactured by Pulse Electronics, designed for through-hole mounting applications. This Active product features dual primary and secondary windings with parallel output of 14V at 860mA or series output of 28V at 430mA. The semi-toroidal core design provides compact form factor with a maximum seated height of 27.05mm. Finding equivalent substitute parts becomes necessary when managing inventory optimization, supply chain continuity, or when alternative manufacturers offer comparable specifications with different availability or lead times.

Substiute Parts

LP28-430B117

Pulse ElectronicsIn Stock: 1055LP28-430B117 Datasheet

Current PartRFQ

FS28-420

Triad MagneticsIn Stock: 1483FS28-420 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

The FS28-420 from Triad Magnetics qualifies as a functional substitute based on the following critical parameters:

• Power Rating: Both parts rated at 12VA
• Secondary Voltage Output: Both provide parallel 14V and series 28V configurations
• Secondary Current Output: FS28-420 delivers parallel 840mA and series 420mA, within acceptable tolerance of the LP28-430B117 specifications
• Primary Winding Configuration: Both feature dual primary windings
• Secondary Winding Configuration: Both feature dual secondary windings
• Mounting Type: Both are through-hole mounted
• Termination Style: Both use PC pin termination
• Isolation Voltage: FS28-420 provides 2500Vrms, exceeding the 1500Vrms requirement

The FS28-420 uses a laminated core design rather than semi-toroidal construction, resulting in different physical dimensions and height characteristics. Both parts maintain Active product status and comply with RoHS and REACH requirements.

Parameter Comparison

Engineering Selection Recommendations

Both the LP28-430B117 and FS28-420 maintain Active product status with full RoHS and REACH compliance, ensuring regulatory alignment for current applications. The LP28-430B117 offers a lower profile design at 27.05mm maximum height with a semi-toroidal core, suitable for space-constrained applications. The FS28-420 provides enhanced isolation voltage at 2500Vrms compared to 1500Vrms, with a more compact footprint in length and width dimensions, though at increased height of 36.50mm.

Current output specifications differ marginally: the FS28-420 delivers 20mA less in parallel mode (840mA vs 860mA) and 10mA less in series mode (420mA vs 430mA). These differences remain within typical engineering tolerances for 12VA transformer applications. Selection between these parts should be based on specific PCB layout constraints, available mounting space, and isolation voltage requirements for the target application.

Frequently Asked Questions (FAQ)

Q: Can the FS28-420 directly replace the LP28-430B117 in existing designs?

A: Functional replacement is possible due to matching power ratings, secondary voltage outputs, and winding configurations. However, physical dimensions differ significantly. The FS28-420 is smaller in footprint but taller (36.50mm vs 27.05mm). PCB layout verification is required to confirm mounting compatibility.

Q: What is the significance of the current output difference between these parts?

A: The FS28-420 provides 20mA less in parallel mode and 10mA less in series mode. For 12VA applications, this represents approximately 2.3% and 2.3% reduction respectively. Applications requiring maximum current delivery should account for this specification variance.

Q: How do the core designs affect performance?

A: The LP28-430B117 uses semi-toroidal construction while the FS28-420 uses laminated core design. Both achieve the same 12VA power rating and secondary voltage specifications. Core design differences primarily affect physical form factor, weight, and electromagnetic characteristics not specified in the provided parameters.

Q: Is the higher isolation voltage of the FS28-420 a compatibility concern?

A: No. The FS28-420 isolation rating of 2500Vrms exceeds the LP28-430B117 requirement of 1500Vrms. Higher isolation voltage provides additional safety margin and is not a limiting factor for substitution.

Q: Are there packaging differences between these parts?

A: Yes. The LP28-430B117 uses standard packaging while the FS28-420 is packaged in boxes under Triad Magnetics' Split Pack™ series. Verify packaging requirements for your procurement and logistics processes.