# Transformer Cores, Toroid, 73.65mm x 38.85mm x 12.7mm, 77

![Product image](https://novapart.co/image/farnell:4154610/)

**URL**: https://novapart.co/products/5977011101/transformer-cores-toroid-7365mm-x-3885mm-127mm-77
**SKU**: 5977011101
**Manufacturer**: FAIR-RITE
**Category**: Transformers || Transformer Cores
**Price**: €9.3700
**Stock**: 50+
**Lead Time**: 172 days (indicative)

## Specifications

| Parameter | Value |
|---|---|
| Svhc | No SVHC (25-Jun-2025) |
| Core Size | 73.65mm x 38.85mm x 12.7mm |
| Core Type | Toroid |
| For Use With | Power Input Filters, Ground-Fault Interrupters, Common-Mode filters , Pulse & Broadband Transformers |
| Product Range | - |
| Core Material Grade | 77 |
| Inductance Factor Al | 3.5µH |
| Effective Magnetic Path Length | 167mm |
| Ae Effective Cross Section Area | 215mm² |

## Datasheet

📄 [Download PDF](https://novapart.co/datasheet/farnell:4154610/)

## Toroids (5977011101) 

Part Number: 5977011101 

77 TOROID 

## Explanation of Part Numbers: 

– Digits 1 & 2 = Product Class 

– Digits 3 & 4 = Material Grade 

•– 9th digit 1 = Parylene Coating, 2 = Thermo- Set Plastic Coating 

**A ring configuration provides the ultimate utilization of the intrinsic ferrite material properties. Toroidal cores are used in a wide variety of applications such as power input filters, ground- fault interrupters, common- mode filters and in pulse and broadband transformers.** 

•All toroidal cores are supplied burnished to break sharp edges. 

## Coating Options: 

••– Toroids with an outside diameter of 9.5 mm (0.375″) or smaller can be supplied Parylene C coated. The Parylene coating will increase the “A” and “C” dimensions and decrease the “B” dimension a maximum of 0.038 mm (0.0015″). The ninth digit of a Parylene coated toroid part number is a “1”. See reference tables for the material characteristics of Parylene C. Parylene C coating is RoHS compliant. 

•– Toroids with an outside diameter of 9.5 mm (0.375″) or larger can be supplied with a uniform coating of thermo- set plastic coating. This coating will increase the “A” and “C” dimensions and decrease the “B” dimension a maximum of 0.5 mm (0.020″). The 9th digit of the thermo- set plastic coated toroid part number is a “2”. Thermo- set plastic coating is RoHS compliant. •– Thermo- set plastic coated parts can withstand a minimum breakdown voltage of 1000 Vrms, uniformly applied across the “C” dimension of the toroid. 

**•For any toroidal core requirement not listed in the catalog, please contact our customer service department for availability and pricing.** 

The “C” dimension may be modified to suit specific applications. 

|Weight:<br>Dim<br>~~a~~<br>a|Weight:<br>188 (g)<br>mm<br>ee<br>ee|mm tol<br>ee|nominal inch|inch misc.|
|---|---|---|---|---|
|A<br>~~a~~<br>a|73.65<br>ee<br>ee|±1.50<br>ee|2.9|_|
|B<br>a|38.85<br>ee|±0.75<br> ee|1.53|_|
|C|12.7|±0.40|0.5|_|



## **Chart Legend** 

Σl/ A  :  Core Constant,    le :  Effective Path Length,    Ae :  Effective Cross- Sectional Area,    Ve : Effective Core Volume 

AL :  Inductance Factor (hel 

|Electrical Properties|Electrical Properties|
|---|---|
|AL(nH)|3500 ±25%|
|Ae(cm<br>2)|2.15|
|Σl/ A(cm<br>-1)|7.8|
|le(cm)|16.7|
|Ve(cm<br>3)|35.9|



Toroids are tested for AL values at 10 kHz. 

Fair- Rite Products Corp.   •   One Commercial Row, Wallkill, New York 12589-0288 

888-324-7748   •   845-895-2055   •   Fax: 845-895-2629   •   ferrites@fair- rite.com   •   www.fair- rite.com 



## Links

- [View this product on Novapart](https://novapart.co/products/5977011101/transformer-cores-toroid-7365mm-x-3885mm-127mm-77)
- [Request a quote for this part](https://novapart.co/quote/)
- [Supplier page](https://es.farnell.com/fair-rite/5977011101/transformer-core-77-toroid-167mm/dp/4154610)
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