> **Source:** Core Electronics is an Australian maker-electronics retailer and manufacturer based in Newcastle, NSW, run by a team of makers and educators. We design and manufacture our own product lines (PiicoDev, CE originals) and are official retailers for iconic maker and industrial brands including Raspberry Pi, Arduino, Adafruit, SparkFun and DFRobot. Orders ship Australia-wide from our Newcastle warehouse. Prices are in AUD and include GST. Pricing, stock and dispatch on this page are generated from the store's live catalog. Full machine-readable index: https://core-electronics.com.au/llms.txt

# FGSensors FG-3+ Sensor

**Type:** Product page · **SKU:** SEN-25531 · **Brand:** [Sparkfun](https://core-electronics.com.au/brands/sparkfun-australia)
**Page:** https://core-electronics.com.au/fgsensors-fg-3-sensor.html ([markdown](https://core-electronics.com.au/fgsensors-fg-3-sensor.html.md))

The FGM-X series of devices are very high sensitivity magnetic field sensors operating in the ±50 microtesla range ( ±0.5 oersted )...

## Pricing

- **Price:** $109.95 (inc GST) — $99.95 AUD, exc GST
- **Quantity discounts:** 5+ $96.95 (exc GST) · 25+ $94.95 (exc GST) · 100+ $90.95 (exc GST)

## Availability & dispatch

- Out of stock — the product page offers email notification when it returns.

## How to buy

- **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=SEN-25531:1` (comma-separated SKU:qty pairs) and share the link. Opening it shows a confirmation page with live pricing and stock before anything is added to the cart.
- **Verify the cart first:** fetch `https://core-electronics.com.au/cart/link/SEN-25531:1.md` for live line prices (inc & exc GST, quantity discounts applied), stock and dispatch estimates, and totals. Append `/to/{AU-postcode}` (or `/to/{country-code}:{postcode}`) before `.md` for delivery options and prices to that destination. Unknown, retired, or out-of-stock SKUs are flagged. (Query form `cart/link.md?items=...` also works but some robots parsers refuse query strings here.)
- **Checkout** is completed on-site and includes a captcha at the payment step. Share the cart link; checkout takes it from there.
- **Search the catalogue:** `https://core-electronics.com.au/search/{query}.md` (URL-encode the query; pages 2-3 at `search/{query}/{page}.md`; `search.md?q=` also works)
- **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt
## Description

The FGM-X series of devices are very high sensitivity magnetic field sensors operating in the ±50 microtesla range ( ±0.5 oersted). They are simple, essentially three terminal devices, operating from a single +5 volt supply, the connections being ground, +5v and output. The output is a robust 5 volt rectangular pulse whose period is directly proportional to the field strength, (giving a frequency which varies inversely with the field), making it very easy to interface to a computer or micro controller. The typical period swing for the full range of an FGM-3 is from 8.5 µs to 25µs (~120 KHz to ~50KHz), a clear indication of its high sensitivity.

Unlike Hall Effect field sensors, which are virtually unusable in this range because of their large temperature sensitivity, the FGM-series has a very low temperature coefficient. Since the lowest effective Nyquist sampling rate is ~50 KHz, appropriate filtering can provide an AC field bandwidth from DC to ~20kHz.

### Features

- Maximum Supply Voltage 7 volts
- Recommended supply Voltage 5 volts ±0.5 volts
- Typical Supply Current 12 mA
- Operating Temperature Range 0 - 50 °C
- Bandwidth: DC to 20 KHz Bandwidth
- Output freq. range: 120 kHz to 50 kHz ( 8.5 milliseconds to 25 milliseconds)

### Documents

- [Datasheet](https://core-electronics.com.au/attachments/localcontent/1593cf_c3b258ce927b47449402b387d8785a70_39257633cab.pdf)
- [Test Report](https://core-electronics.com.au/attachments/localcontent/7034a0_7c942a70f1074c8091d6ec67f5a69add_4453816c4e5.pdf)
- [App Note](https://core-electronics.com.au/attachments/localcontent/7034a0_505d6150a82448c8ae711f0df33e4a0d_90885ffe522.pdf)
- [Specifications](https://core-electronics.com.au/attachments/localcontent/7034a0_c59536c9022b4a5798fcc6045dcf6841_56895857ed6.pdf)

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/S/E/SEN-25531-1.jpg)