TMR vs Hall Effect switches
TMR is the newest sensor under the same magnet. It does not change what a magnetic switch does — adjustable actuation and rapid trigger behave identically — it changes how precisely and how efficiently the PCB reads the magnet.
Same switch, different sensor
Both families put a magnet in the stem and read its position from the PCB:
- Hall Effect (HE): a Hall sensor outputs voltage proportional to magnetic flux. Proven, cheap, ubiquitous — every HE board shipped so far uses it.
- TMR (Tunneling Magnetoresistance): a sensor whose resistance changes with field direction via quantum tunneling. It is far more sensitive to small field changes and needs less current — which is why it took over gaming-controller thumbsticks first.
What that buys a keyboard: finer position resolution (smoother rapid-trigger curves at 0.01 mm-class sensitivity), better behaviour at the edges of the flux window, and lower sensor power draw — the last one matters mainly for wireless magnetic boards, where sensor current is a real battery line item.
What does not change
| Hall Effect | TMR |
|---|
| Magnet in stem | Yes | Yes — same switches physically |
| Adjustable actuation / rapid trigger | Yes | Yes |
| SOCD / analog features | Board firmware | Board firmware |
| Keycaps | MX-style stems | MX-style stems |
| Socket rules | Board-family specific | Board-family specific |
The compatibility logic in the checker — socket, polarity, keycap tolerance — applies unchanged. A TMR board is still an HE-style board to your keycaps.
Where TMR actually wins — and where it doesn't
- Wins: wireless magnetic boards (battery life), extreme-sensitivity rapid trigger, headroom against sensor saturation with very strong magnets.
- Doesn't: wired 60HE-style gaming. At 1–8 kHz polling the bottleneck is the game and the PCB, not the sensor physics. "TMR is faster" claims don't survive a stopwatch on wired boards.
- Ecosystem: still young. Cross-compatibility charts are thinner than HE's; vendors are only starting to publish dual-protocol switches (Gateron's Magnetic Jade Silent explicitly targets HE + TMR boards).
Buying checklist for a "TMR" board
- Confirm the board actually has a TMR sensor per model — some lines mix sensor types across revisions.
- Check which switches the board validates (socket + polarity), same as HE. Start from the board's shipped switch family.
- Ask what you're buying it for: wireless battery life or analog feel → TMR is a genuine reason. Pure wired speed → any competent HE board is equivalent in practice.
- If a dual-protocol switch exists for your board (e.g. Jade Silent), it removes the guesswork entirely.
FAQ
What is a TMR keyboard switch?
A switch that works exactly like a Hall Effect switch — magnet in the stem, sensor on the PCB — but uses a Tunneling Magnetoresistance (TMR) sensor instead of a Hall sensor. The keyboard still reads continuous stem position, so adjustable actuation and rapid trigger work the same way.
Is TMR better than Hall Effect for keyboards?
In principle yes, in practice marginally. TMR sensors react to smaller magnetic-field changes, so they can resolve finer position steps and draw less power — useful for wireless magnetic boards. On a wired gaming board at 1000 Hz+ polling you will not feel a difference; treat TMR as a refinement, not a new category.
Can TMR switches work in Hall Effect boards (and vice versa)?
The switch itself is just a magnet and a stem, so the gate is the socket and PCB calibration, not the sensor type — exactly like HE. Gateron ships its Magnetic Jade Silent as one switch for both HE and TMR boards. Always check the vendor board table before mixing.
Why do gamepad TMR sticks keep coming up in switch searches?
TMR became known through controller thumbsticks (finer resolution analog, no drift), so TMR autocomplete mixes joystick and keyboard results. For switches, scope searches to "TMR switch keyboard".