This Product Selection Guide contains information to help select products in the Power Transformers category on DigiKey.com
Products in the power transformers family include those designed for transformation of AC utility power at nominal frequencies of 400 Hz or less that contain galvanically isolated primary and secondary windings. They are not packaged or equipped with the common connectors used for AC utility powered products, making them unserviceable as an end-use product in an isolation transformer capacity.
SelectionCharacteristics
Type: Refers to the specific construction or design configuration of the transformer’s core and winding arrangement.
Voltage - Primary: Indicates nominal AC input voltages with which a device is designed for use: multiple values indicate different connection options, allowing production of the listed secondary voltages from any of the listed primary voltages.
Voltage - Secondary (Full Load): Nominal AC RMS output voltage appearing at the device output windings when the rated output current is being drawn and the nominal primary voltage is applied.
Current - Output (Max): The maximum amount of current that can be output by the device.
Primary Winding(s): Describes the configuration of the transformer’s primary winding(s), which are those typically connected to a power source.
Secondary Winding(s): Indicates the number of separate windings present on the side of the transformer that is typically used to deliver power to a load.
Center Tap: Indicates whether or not a user-accessible connection to the midpoint of the secondary winding is present.
Power - Max: Typically this represents the maximum power rating to which a device will meet its given specifications. Exceeding this power rating may damage the device and other system components.
Mounting Type: Indicates how the device is attached.
Termination Style: Selection of termination style used to connect the device to a system, such as PC pin, solder pad, or wire leads.
Size / Dimension: The physical dimensions of the device, typically listed in length and width or diameter.
Height - Seated (Max): Indicates how far the device will extend above the surface to which it has been attached.
Voltage - Isolation: Indicates the level of electrical isolation provided between the primary and secondary windings of the transformer.
Weight: Indicates the overall weight of the transformer, typically listed in pounds or grams.
ProductExamples
| MFR PART # | 186D48 |
|---|---|
| DIGI-KEY PART # | HM4699-ND |
| MANUFACTURER | Hammond Manufacturing |
| DESCRIPTION | PWR XFMR LAMINATED 30VA CHAS MT |
| DATASHEET | Click Here |
| MFR PART # | 161C10 |
|---|---|
| DIGI-KEY PART # | HM4168-ND |
| MANUFACTURER | Hammond Manufacturing |
| DESCRIPTION | PWR XFMR LAMINATED 0.5VA TH |
| DATASHEET | Click Here |
| MFR PART # | VPT48-3300 |
|---|---|
| DIGI-KEY PART # | 237-1349-ND |
| MANUFACTURER | Triad Magnetics |
| DESCRIPTION | PWR XFMR TORO 160VA CHAS MT |
| DATASHEET | Click Here |
SchematicSymbol
Schematic symbol courtesy of Scheme-it. Please see their website for more information and symbols.
MediaLinks
Videos
VPT Series of Toroidal Power Transformers
WEbinar Powered by DigiKey: Basics of Power
TechForum
Power Transformer - inherently and non-inherently limited - Power / Transformers
Transformers vs. Power Supplies
Transformer Rated Power Capacity
Triad Magnetics Transformers “B” Suffix
Transformer Primary / Secondary Impedance