Guide
Hall Effect vs TMR vs Potentiometer Sticks: What Actually Causes Drift
Stick drift is a wear problem, not a software one. We fit these modules every day, so here is how the three sensor types actually differ — including what the magnetic ones do not fix.
The short answer. Stock controllers use potentiometer sticks, where a physical wiper scrapes a resistive track. That contact wears, sheds conductive dust, and the controller starts reading movement you are not making. Hall Effect and TMR sticks read position magnetically, with nothing touching, which removes the cause. TMR is the newer and more precise of the two, but the gap between Hall Effect and TMR is far smaller than the gap between either and a stock stick.
What stick drift actually is
Drift is when your character keeps walking, or your aim keeps pulling, with your thumb off the stick. It gets blamed on software and on firmware updates. It is almost always mechanical.
A controller has to convert a physical stick position into a number. In a stock DualSense, Xbox pad or Joy-Con, that job is done by two potentiometers, one for each axis.
Potentiometer sticks: why they wear out
A potentiometer is a resistive track with a small metal arm, the wiper, pressed against it. Move the stick, the wiper slides along the track, the resistance changes, and the controller reads that change as position.
The weakness is in the description: the wiper is physically touching the track, and it moves across it every time you play. Over thousands of hours that contact does two things. It wears a groove into the resistive material, and it sheds fine conductive dust into the housing.
Once the track is worn or contaminated, the resistance reading at rest is no longer the resistance the controller expects at centre. The controller reads a small permanent offset and acts on it. That is drift.
Recalibrating tells the controller to treat the new, wrong reading as centre. It genuinely helps, briefly. But the wear continues, so the offset keeps moving, and you end up recalibrating more and more often until the dead zone needed to hide the fault is large enough to hurt your aim.
Hall Effect sticks: measuring without touching
A Hall Effect stick puts a small magnet on the stick shaft and a sensor beneath it. As the stick moves, the magnet moves relative to the sensor, and the sensor measures the strength of the magnetic field it is sitting in. Field strength varies with distance, so that reading becomes position.
Nothing touches anything. There is no wiper, no track, no groove and no conductive dust. The wear mechanism that produces drift in a potentiometer stick simply is not present.
This is why Hall Effect is the upgrade that matters most on a controller you intend to keep. It is also why we fit the modules during the build rather than retrofitting them afterwards.
TMR sticks: the newer magnetic option
TMR stands for tunnel magnetoresistance. It is also magnetic and also contactless, so it solves the same wear problem. The difference is in what it measures.
Where a Hall sensor measures how strong the field is — effectively, how far away the magnet sits — a TMR sensor measures the orientation of the field. That turns out to be a more sensitive thing to measure, which gives TMR finer resolution and a faster response to very small movements. It also draws less power, which matters on a wireless controller.
TMR is better than Hall Effect. It is also a smaller improvement than the marketing around it suggests. The meaningful jump is from potentiometer to magnetic. The jump from Hall Effect to TMR is a refinement on top of that, and most players will not feel it in the way they will feel the absence of drift.
| Potentiometer | Hall Effect | TMR | |
|---|---|---|---|
| How it reads position | Wiper on a resistive track | Magnetic field strength | Magnetic field orientation |
| Physical contact | Yes | No | No |
| Wear-based drift | Expected over time | Cause removed | Cause removed |
| Precision | Adequate, degrades | High, stable | Highest |
| Power draw | Low | Moderate | Lowest |
| Found in | Most stock controllers | Aftermarket and custom builds | Newer aftermarket modules |
What magnetic sticks do not fix
This is the section most articles on this subject leave out, and it is the reason we would rather you read it here than find it out after buying something.
Hall Effect and TMR remove one failure mode, and it happens to be the most common one. They do not make a controller immortal.
The mechanism around the sensor still wears
The sensor is contactless. The gimbal it sits in is not. The plastic pivot, the return spring and the stick housing are all still moving parts under thumb pressure, and they age. A magnetic stick that has taken a hard drop or worn its gimbal can develop a genuine centring problem, and no sensor technology prevents that.
Calibration faults are firmware, not sensors
If a controller applies the wrong dead zone or stores a bad centre point, it will behave like it is drifting regardless of what is underneath. That is a software fault with a software fix, and swapping the sensor will not touch it.
Module quality varies, and it matters
“Hall Effect” describes a sensing method, not a standard of manufacture. A cheaply made magnetic module with sloppy tolerances or a poorly seated magnet can read worse than a well-made potentiometer stick. Buying on the label alone is how people end up disappointed by a technology that was never the problem.
It does not fix the rest of the controller
Worn stick caps, mushy triggers, tired face buttons and a failing battery are all separate wear items. A stick upgrade addresses the sticks. Keeping the rest in good order is covered in our controller care guide.
Hall Effect and TMR remove the mechanism that causes the overwhelming majority of stick drift. That is a genuine and substantial improvement, and it is the single upgrade most likely to extend the useful life of a controller. It is not a guarantee against every possible fault, and anyone telling you otherwise is selling rather than explaining.
Which should you choose?
If your controller is already drifting
Try recalibration first — it costs nothing and occasionally the fault really is software. If the drift returns within days, the track is worn and no amount of recalibration will hold. At that point the choice is a sensor replacement or a new controller.
Our step-by-step guide to fixing stick drift walks through the free options first, in the order we would actually try them.
If you are buying a controller to keep
Fit magnetic sticks from the start. Retrofitting later means opening a controller that has already worn, and paying twice. This is why we install the modules during the build rather than as an afterthought — the upgrade options are chosen alongside the build.
Hall Effect or TMR?
Either ends the drift problem. Choose TMR if you play competitively and want the finest resolution and the lowest power draw. Choose Hall Effect if you want the wear problem solved at a lower cost. It is the difference between excellent and marginally more excellent, not between working and broken.
Not every controller and platform supports every module. The options that are actually available depend on the platform and the build, which is worth checking on the individual product before ordering.
Common questions
Does Hall Effect completely stop stick drift?
It removes the cause of the common kind, which is the wear of a physical contact. It cannot prevent drift-like behaviour caused by a damaged gimbal, a firmware calibration fault or a badly manufactured module. In normal use, on a well-made module, wear-based drift stops being a concern.
Is TMR worth paying more for?
For competitive play, yes. Finer resolution and lower power draw are real. For most players the honest answer is that moving off potentiometer sticks is the upgrade they will feel, and the choice between the two magnetic options matters much less.
Can I fit these to a controller I already own?
Physically, often yes. Practically it means opening a controller that has already accumulated wear elsewhere. Fitting during a build is cleaner and usually cheaper overall.
Will magnets near my controller cause problems?
In ordinary use, no. The sensor is reading a magnet a couple of millimetres away, and ambient household magnetic fields are nowhere near strong enough to matter.
Why do stock controllers still use potentiometers?
Cost, mostly, at the scale the platform holders manufacture. It is also why the aftermarket exists.
Controllers built with magnetic sticks
Newer Switch Lite builds ship with Hall Effect sticks already fitted. Switch 2 Joy-Cons and our other products can have them added as an option — Switch 2 Pro Controllers not yet.
