Equivalent & Substitute Parts for PF24-24 Semi-Toroidal Power Transformer

Part Overview

The PF24-24 is a 24VA semi-toroidal power transformer manufactured by Tamura, designed for through-hole mounting applications. It features dual primary and secondary windings with selectable output configurations (parallel 12V at 2A or series 24V at 1A) and supports dual input voltages (115V or 230V). The product is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and component procurement.

Key Parameters

Parameter	Value
Power Rating	24VA
Primary Voltage Options	115V, 230V
Secondary Voltage (Parallel)	12V
Secondary Voltage (Series)	24V
Output Current (Parallel)	2A
Output Current (Series)	1A
Primary Winding Configuration	Dual
Secondary Winding Configuration	Dual
Mounting Type	Through Hole
Termination Style	PC Pin
Isolation Voltage	1500Vrms
Transformer Type	Semi-Toroidal
Center Tap	No

Substitute Part Grouping Explanation

Substitution eligibility for the PF24-24 is determined by strict equivalence across the following critical parameters:

Electrical Specifications:

Power rating of 24VA
Primary voltage support for both 115V and 230V
Secondary output configuration: dual windings supporting parallel 12V/2A and series 24V/1A
Isolation voltage of 1500Vrms
Dual primary and dual secondary winding architecture
No center tap requirement

Mechanical and Interface Specifications:

Semi-toroidal form factor
Through-hole mounting compatibility
PC pin termination style
Physical dimensions within acceptable tolerance ranges for PCB mounting

Compliance and Regulatory:

ECCN classification: EAR99
HTSUS code: 8504.31.4035

The LP-24-1000 manufactured by Signal Transformer meets all specified electrical and mechanical parameters, confirming direct substitution capability.

Parameter Comparison

Parameter	PF24-24 (Tamura)	LP-24-1000 (Signal Transformer)	Match Status
Power Rating	24VA	24VA	Equivalent
Primary Voltage	115V, 230V	115V, 230V	Equivalent
Secondary Voltage (Parallel)	12V	12V	Equivalent
Secondary Voltage (Series)	24V	24V	Equivalent
Output Current (Parallel)	2A	2A	Equivalent
Output Current (Series)	1A	1A	Equivalent
Primary Winding Configuration	Dual	Dual	Equivalent
Secondary Winding Configuration	Dual	Dual	Equivalent
Mounting Type	Through Hole	Through Hole	Equivalent
Termination Style	PC Pin	PC Pin	Equivalent
Isolation Voltage	1500Vrms	1500Vrms	Equivalent
Transformer Type	Semi-Toroidal	Semi-Toroidal	Equivalent
Center Tap	No	No	Equivalent
Length	72.00mm	72.90mm	Within tolerance
Width	58.00mm	57.20mm	Within tolerance
Height (Seated Max)	31.80mm	31.80mm	Equivalent
Product Status	Obsolete	Active	Substitute is active
RoHS Status	Not specified	ROHS3 Compliant	Substitute exceeds requirement
ECCN	EAR99	EAR99	Equivalent
HTSUS	8504.31.4035	8504.31.4035	Equivalent

Engineering Selection Recommendations

Primary Substitute: LP-24-1000 (Signal Transformer)

The LP-24-1000 is the direct functional equivalent for the obsolete PF24-24. All electrical specifications, winding configurations, and mechanical interfaces are identical. The substitute maintains the same 24VA power rating, dual primary/secondary winding architecture, and through-hole PC pin termination required for PCB integration.

Compliance Advantages:

The LP-24-1000 carries active product status with ROHS3 compliance certification, providing regulatory advantage over the obsolete PF24-24. Both parts share identical ECCN (EAR99) and HTSUS (8504.31.4035) classifications, ensuring consistent export and tariff treatment.

Physical Compatibility:

Dimensional variance between the two parts is minimal. The LP-24-1000 measures 72.90mm length and 57.20mm width compared to the PF24-24 at 72.00mm and 58.00mm respectively. Height is identical at 31.80mm seated maximum. These dimensional differences fall within standard PCB layout tolerances for through-hole transformer mounting.

Inventory and Availability:

The LP-24-1000 is currently in active production with 1,048 units in stock, compared to 673 units of the obsolete PF24-24. Selection of the active substitute ensures long-term component availability and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can the LP-24-1000 directly replace the PF24-24 without PCB modifications?

A: Yes. The LP-24-1000 is electrically and mechanically equivalent. Through-hole mounting, PC pin termination, and physical dimensions are compatible with existing PF24-24 PCB layouts. Dimensional tolerances are within standard manufacturing ranges for transformer mounting.

Q: Are the winding configurations identical between the two parts?

A: Yes. Both the PF24-24 and LP-24-1000 feature dual primary and dual secondary windings with identical voltage and current ratings. The parallel 12V/2A and series 24V/1A output configurations are functionally equivalent.

Q: What is the significance of the LP-24-1000 being ROHS3 compliant?

A: ROHS3 compliance indicates the LP-24-1000 meets current environmental and hazardous substance restrictions. This provides regulatory advantage for new designs and systems subject to ROHS directives. The PF24-24 RoHS status is not specified.

Q: Are there any isolation or safety rating differences?

A: No. Both parts maintain 1500Vrms isolation voltage. Both carry identical ECCN (EAR99) classification, indicating equivalent regulatory treatment for export and compliance purposes.

Q: Why is the PF24-24 classified as obsolete?

A: The PF24-24 is no longer in active production. The LP-24-1000 serves as the current production equivalent, ensuring continued availability and support for this transformer specification.

Q: How do the physical dimensions affect PCB layout?

A: The LP-24-1000 is 0.9mm longer and 0.8mm narrower than the PF24-24. Height is identical. These variations are within standard PCB design tolerances for through-hole component placement and do not require layout modifications.

Q: Is the LP-24-1000 available in the same packaging as the PF24-24?

A: The LP-24-1000 is supplied in bulk packaging, while the PF24-24 packaging specification is not provided. Both parts use identical PC pin termination and through-hole mounting, ensuring functional compatibility regardless of packaging format.

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