---
product_id: 695769822
title: "FT-140-43 Ferrite Toroid Core - Amidon | 43 Material"
brand: "fair-rite"
price: "$982"
currency: MXN
in_stock: true
reviews_count: 5
category: "Fair Rite"
url: https://www.desertcart.mx/products/695769822-ft-140-43-ferrite-toroid-core-amidon-43-material
store_origin: MX
region: Mexico
---

# High AL value 885 ±20% Precision dimensions ±0.75mm Wideband freq. 5-400 MHz FT-140-43 Ferrite Toroid Core - Amidon | 43 Material

**Brand:** fair-rite
**Price:** $982
**Availability:** ✅ In Stock

## Summary

> ⚙️ Elevate your RF game with precision and power!

## Quick Answers

- **What is this?** FT-140-43 Ferrite Toroid Core - Amidon | 43 Material by fair-rite
- **How much does it cost?** $982 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.mx](https://www.desertcart.mx/products/695769822-ft-140-43-ferrite-toroid-core-amidon-43-material)

## Best For

- fair-rite enthusiasts

## Why This Product

- Trusted fair-rite brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Wideband frequency range:** Optimized for 5-400 MHz, perfect for versatile transformer and RFI suppression needs
- • **Trusted by RF enthusiasts:** Preferred choice for low SWR antennas and reliable power transformers
- • **Robust ferrite core design:** Lightweight yet durable at just 59g, built to last in demanding electronic environments
- • **High permeability 43 material:** Delivers superior inductance and minimal signal loss for professional-grade performance
- • **Precision-engineered dimensions:** Ensures seamless integration with your custom RF projects

## Overview

The FT-140-43 Ferrite Toroid Core by Fair-Rite features a high AL value of 885 ±20%, supporting wideband frequencies from 5 to 400 MHz. With precise dimensions (OD 35.55mm ±0.75mm, ID 23.0mm ±0.55mm, height 12.7mm ±0.50mm) and lightweight design (59g), it’s engineered for efficient wideband transformers, power transformers, and RFI suppression. Trusted by amateur radio and electronics professionals alike, this core delivers consistent, high-performance inductance for advanced RF applications.

## Description

One FT140-43 Toroid Core Brand: Fair-Rite AL=885 +/- 20 % uH=(AL*Turns2)/1000 Wideband Transformers 5 - 400 MHz Power Transformers 0.5 - 30 MHz RFI Suppression 5 - 500 MHz OD= 1.400 in / 35.55 mm +/- 0.75 mm ID = 0.900 in / 23.0 mm +/- 0.55 mm Ht = 0.500 in / 12.7 mm +/- 0.50 mm From bulk packaging, not in retail packaging.

Review: The folks at FW Electronics are great. This was a product I needed and wanted. I ordered it and the product arrived quickly and painlessly. Nearly all the way good. I opened the packaging and noticed a discrepancy between what I ordered and what I received. Quickly a mistake was realized and communicated to FW-Electronics. Of course, these discrepancies can cause problems if you aren't careful. FW-Electronics sent a replacement just as quickly and without additional cost to me. For most everyone, these are the critical details. Product sold, good product, fast turnaround, etc. All of those things I report about FW - Electronics. Here's the important part of the review: This company made a mistake, initially. These things happen and nobody was upset. Understanding that toroid core mixes are very specific for use in amateur radio applications (as in other applications). So there's a confidence concern in my case when I lack the test equipment to identify the different mixes. FW - Electronics helped me visually identify the core types and sent the correct (though properly labeled) toroid cores without cost to me, and let me keep the incorrect toroids (which I still will readily put to good use at my QTH or to a deserving ham learning to use RF chokes). My point in this detail is I appreciate great products and great service. But I appreciate it so much more when things *don't* go well and the company and staff make it right. Nobody's perfect, but making it perfect when it isn't shows me the company appreciates the customers' work product and respects their own. I'll keep coming back to FW! 73 DE K6RCS
Review: Used to make 9:1 end fed antennas. Works good. <1.5 swr 10 to 80 meters.

## Features

- FT140-43
- Ferrite

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0178IABXW |
| ASIN  | B0178IABXW |
| Batteries Included? | No |
| Batteries Required? | No |
| Customer Reviews | 4.7 4.7 out of 5 stars (292) |
| Customer reviews | 4.7 4.7 out of 5 stars (292) |
| Date First Available | 23 September 2024 |
| Date First Available  | 23 September 2024 |
| Is Discontinued By Manufacturer  | No |
| Item Weight | 59 g |
| Item model number | FT140-43 |
| Item model number  | FT140-43 |
| Manufacturer | FAIR-RITE |
| Manufacturer  | FAIR-RITE |
| Material | Type 43 Ferrite |
| Measurement System | English |
| Part number | FT140-43 |
| Product Dimensions | 5.08 x 2.54 x 5.08 cm; 58.97 g |
| Product Dimensions  | 5.08 x 2.54 x 5.08 cm; 58.97 g |

## Images

![FT-140-43 Ferrite Toroid Core - Amidon | 43 Material - Image 1](https://m.media-amazon.com/images/I/61diiIcIasL.jpg)
![FT-140-43 Ferrite Toroid Core - Amidon | 43 Material - Image 2](https://m.media-amazon.com/images/I/619Pnl6ygPL.jpg)
![FT-140-43 Ferrite Toroid Core - Amidon | 43 Material - Image 3](https://m.media-amazon.com/images/I/51HDZ2ngCKL.jpg)
![FT-140-43 Ferrite Toroid Core - Amidon | 43 Material - Image 4](https://m.media-amazon.com/images/I/61WzWH6mGxL.jpg)
![FT-140-43 Ferrite Toroid Core - Amidon | 43 Material - Image 5](https://m.media-amazon.com/images/I/618rQYE48lL.jpg)

## Questions & Answers

**Q: How much power will a balun made from an FT140-43 handle?**
A: The maximum power has to do with the permeability of the material and the field strength your coil generates. If you exceed the maximum power, you won't damage the unit, but will incur losses as the ferrite material is saturated and cannot support an increased magnetic field. 

I'm using a single FT140-43 for a 49:1 UNUN (16 gage wire) running at 10 watts max for portable field operations, and it works very well for this application. According to my calculations, it could handle up to 37.5 watts CW or 60 watts SSB. If you need more power, I would recommend stacking two FT140-43s, and you could double the power, i.e. 120 watts SSB / 75 watts CW. If you're looking for even higher power, I would look at using an FT240-43 or FT240-52 core.

**Q: What is the country of origin?**
A: Faur-Rite Brand (the manufacturer) FT140-43 are manufactured in China.

**Q: Where do you put these , on the wire or somewhere else ? I see some say wrapping the wire , do you run it in and out of the ring ?**
A: Yes you run it in and out of the ring as many times as it can.

**Q: Can this be used for long wire unun balun? some sites suggest t-130 hence the question.**
A: Yes. I wrapped mine with #12 antenna wire as a choke between my elevated radials and earth ground. Major improvement to my signal strength. K5AE

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by R***L on 1 November 2021*

The folks at FW Electronics are great. This was a product I needed and wanted. I ordered it and the product arrived quickly and painlessly. Nearly all the way good. I opened the packaging and noticed a discrepancy between what I ordered and what I received. Quickly a mistake was realized and communicated to FW-Electronics. Of course, these discrepancies can cause problems if you aren't careful. FW-Electronics sent a replacement just as quickly and without additional cost to me. For most everyone, these are the critical details. Product sold, good product, fast turnaround, etc. All of those things I report about FW - Electronics. Here's the important part of the review: This company made a mistake, initially. These things happen and nobody was upset. Understanding that toroid core mixes are very specific for use in amateur radio applications (as in other applications). So there's a confidence concern in my case when I lack the test equipment to identify the different mixes. FW - Electronics helped me visually identify the core types and sent the correct (though properly labeled) toroid cores without cost to me, and let me keep the incorrect toroids (which I still will readily put to good use at my QTH or to a deserving ham learning to use RF chokes). My point in this detail is I appreciate great products and great service. But I appreciate it so much more when things *don't* go well and the company and staff make it right. Nobody's perfect, but making it perfect when it isn't shows me the company appreciates the customers' work product and respects their own. I'll keep coming back to FW! 73 DE K6RCS

### ⭐⭐⭐⭐⭐ Review
*by A***R on 18 October 2025*

Used to make 9:1 end fed antennas. Works good. <1.5 swr 10 to 80 meters.

### ⭐⭐⭐⭐⭐ Review
*by D***N on 7 January 2026*

Because this is an Amidon core, I can rely on it to perform per its specs. Off-brand cores that "work like" Amidon or FairRite cores simply can't be relied upon to perform as well. This is especially true in antenna systems where high power is used.

## Frequently Bought Together

- FT-140-43 Ferrite Toroid Core - Amidon | 43 Material
- BNTECHGO 16 AWG Magnet Wire - Enameled Copper Wire - Enameled Magnet Winding Wire - 4 oz - 0.0492" Diameter 1 Spool Coil Red Temperature Rating 155℃ Widely Used for Transformers Inductors
- FT-240-43 FT240-43 Ferrite Toroid Core 43 Material

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---

*Product available on Desertcart Mexico*
*Store origin: MX*
*Last updated: 2026-03-09*