Tamura PF24-16 Semi-Toroidal Power Transformer: Equivalent & Substitute Parts

Part Overview

The Tamura PF24-16 is a semi-toroidal power transformer rated at 24VA with dual primary and secondary windings. It features selectable output configurations (parallel 8V/3A or series 16V/1.5A) and is designed for through-hole mounting applications. The product is classified as obsolete, making identification of compatible substitute components essential for ongoing system support and procurement planning.

Key Parameters

Parameter	Value
Power Rating	24VA
Primary Voltage Options	115V, 230V
Secondary Voltage (Parallel)	8V
Secondary Voltage (Series)	16V
Output Current - Parallel	3A (Max)
Output Current - Series	1.5A (Max)
Transformer Type	Semi-Toroidal
Primary Windings	Dual
Secondary Windings	Dual
Center Tap	No
Isolation Voltage	1500Vrms
Mounting Type	Through Hole
Termination Style	PC Pin
Dimensions (L x W)	72.00mm x 58.00mm
Height (Seated Max)	31.80mm
Isolation Rating	1500Vrms
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the Tamura PF24-16 is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Requirements:

Identical power rating: 24VA
Matching primary voltage options: 115V and 230V dual configuration
Matching secondary voltage outputs: Parallel 8V and Series 16V
Matching output current specifications: Parallel 3A and Series 1.5A
Identical isolation voltage: 1500Vrms
Matching winding configuration: Dual primary and dual secondary

Mechanical Equivalence Requirements:

Transformer type: Semi-toroidal construction
Mounting method: Through-hole
Termination: PC pin connections
Physical dimensions compatible with 72.00mm L x 58.00mm W x 31.80mm H envelope

Regulatory & Compliance Equivalence:

ECCN classification: EAR99
HTSUS code: 8504.31.4035

The Signal Transformer LP-16-1500 meets all specified electrical and mechanical parameters and is classified as an active product, providing continuity for applications currently using the obsolete Tamura PF24-16.

Parameter Comparison

Parameter	Tamura PF24-16	Signal Transformer LP-16-1500	Match Status
Manufacturer	Tamura	Signal Transformer	Different Manufacturer
Power Rating	24VA	24VA	Equivalent
Primary Voltage	115V, 230V	115V, 230V	Equivalent
Secondary Voltage (Parallel)	8V	8V	Equivalent
Secondary Voltage (Series)	16V	16V	Equivalent
Output Current - Parallel	3A	3A	Equivalent
Output Current - Series	1.5A	1.5A	Equivalent
Transformer Type	Semi-Toroidal	Semi-Toroidal	Equivalent
Primary Windings	Dual	Dual	Equivalent
Secondary Windings	Dual	Dual	Equivalent
Center Tap	No	No	Equivalent
Isolation Voltage	1500Vrms	1500Vrms	Equivalent
Mounting Type	Through Hole	Through Hole	Equivalent
Termination Style	PC Pin	PC Pin	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 Compliant
ECCN	EAR99	EAR99	Equivalent
HTSUS	8504.31.4035	8504.31.4035	Equivalent

Engineering Selection Recommendations

Primary Substitute: Signal Transformer LP-16-1500

The Signal Transformer LP-16-1500 is the qualified substitute for the obsolete Tamura PF24-16. Selection is based on the following engineering criteria:

Electrical Compatibility: All electrical parameters are equivalent, including power rating, voltage configurations, current ratings, and isolation specifications. The transformer supports identical dual primary (115V/230V) and dual secondary (8V parallel / 16V series) configurations.

Mechanical Compatibility: Physical dimensions are within acceptable tolerance ranges for through-hole PCB mounting. The maximum seated height of 31.80mm is identical to the original part. Minor variations in length (72.90mm vs. 72.00mm) and width (57.20mm vs. 58.00mm) are within standard manufacturing tolerances and do not affect mounting compatibility.

Product Status & Availability: The LP-16-1500 is classified as an active product with confirmed inventory availability (1763 units), ensuring long-term procurement viability compared to the obsolete Tamura PF24-16.

Regulatory Compliance: Both parts share identical ECCN (EAR99) and HTSUS (8504.31.4035) classifications. The Signal Transformer LP-16-1500 carries ROHS3 compliance certification, meeting current environmental standards.

Termination & Mounting: PC pin termination and through-hole mounting are identical, eliminating the need for circuit board redesign or connector modifications.

Frequently Asked Questions (FAQ)

Q: Can the Signal Transformer LP-16-1500 directly replace the Tamura PF24-16 without circuit modifications?

A: Yes. The LP-16-1500 is electrically and mechanically equivalent. All voltage outputs, current ratings, winding configurations, and mounting specifications are identical. No circuit board redesign is required.

Q: Are there dimensional differences that could affect PCB layout?

A: Minor dimensional variations exist: length differs by 0.90mm (72.90mm vs. 72.00mm) and width differs by 0.80mm (57.20mm vs. 58.00mm). These variations are within standard manufacturing tolerances and do not affect through-hole mounting compatibility. The seated height is identical at 31.80mm.

Q: What is the difference in product status between these two transformers?

A: The Tamura PF24-16 is classified as obsolete, meaning it is no longer manufactured and inventory is limited. The Signal Transformer LP-16-1500 is an active product with ongoing manufacturing and confirmed stock availability, providing long-term supply chain security.

Q: Do both transformers meet the same regulatory requirements?

A: Yes. Both parts share identical ECCN (EAR99) and HTSUS (8504.31.4035) classifications. The Signal Transformer LP-16-1500 additionally carries ROHS3 compliance certification.

Q: Are the dual winding configurations identical?

A: Yes. Both transformers feature dual primary windings (115V/230V selectable) and dual secondary windings (8V parallel or 16V series). Neither transformer includes a center tap.

Q: What is the isolation voltage rating for both transformers?

A: Both the Tamura PF24-16 and Signal Transformer LP-16-1500 are rated for 1500Vrms isolation voltage.

Q: Can these transformers be used in parallel or series configurations?

A: Yes. Both transformers support dual secondary winding configurations allowing parallel connection (8V at 3A maximum) or series connection (16V at 1.5A maximum).

Q: Is there any difference in packaging between the two parts?

A: The Tamura PF24-16 packaging is listed as "-" (not specified). The Signal Transformer LP-16-1500 is supplied in bulk packaging. Both are through-hole mounted components with PC pin termination.

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