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ASM Pacific Technology Turret Wafer Level Test System SUNBIRD
SUNBIRD provides an efficient, reliable and flexible wafer testing solution for the semiconductor industry through innov...
Semiconductor device handling
Gravity Handler Equipment for Controlled Device Transfer
A semiconductor gravity handler moves packaged devices through inclined tubes or guided tracks, but gravity only supplies the motion. Tracks, escapements, stoppers, sensors and output modules control spacing, orientation, position and destination so each device reaches the next station in a repeatable condition.
Transport principlePackages move along a constrained incline rather than through uncontrolled free fall.
Control hardwareGuides, separators, stops and sensors release and position one device at a time.
Application fitPackage geometry, media and the installed track kit matter before rated speed.
What makes gravity handling controlled?
The Device Follows a Defined Route, Not an Open Chute
The architecture is useful only when the machine can keep each package oriented, release it individually and send it to a known station or output. These three controls separate a gravity handler from passive material flow.
01
Constrained Motion
Tubes, rails or machined tracks support the package while the incline creates movement. Track profile, surface condition and package geometry determine whether travel remains stable.
02
Single-Device Release
Escapements, gates and stoppers separate a column of devices into timed releases. Reliable separation prevents overlapping parts, bridging and double feeding.
03
Controlled Destination
Sensors, station stops and output gates keep the device associated with the required process result, grade or destination instead of allowing it to leave the route arbitrarily.
Current equipment
Request Current Availability
Available Gravity Handler Equipment
Open the listed machine page, then confirm the actual input module, track set, package tooling, installed stations and output arrangement. Machines from the same family may have very different usable routes.
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Typical device route
How a Device Moves Through a Gravity Handler
The exact route depends on the installed machine. The sequence below shows how gravity transport becomes controlled handling; test, inspection, marking or thermal processing appears only when the actual unit includes that station.
Load the Input Media
Devices enter from tubes, magazines, a bowl or another supported feeder. The input module must preserve the required orientation and maintain a stable column of parts.
Separate One Device
Guides, sensors and escapements confirm device presence and release one package into the controlled track position without allowing a second device to follow prematurely.
Travel Through the Guided Track
The package slides or rolls along a constrained route. Track angle, friction, center of mass, lead geometry and contamination influence whether movement stays consistent.
Stop at the Required Station
A stopper or indexing mechanism positions the device for orientation, inspection, marking, testing, transfer or another installed operation.
Apply the Routing Decision
After the operation, the control system releases the package according to the grade, pass/fail state or routing instruction received from the installed process.
Collect at the Correct Output
Devices move to tubes, bins, trays or bulk collection. The output module must keep result categories separate and preserve orientation where the next process requires it.
Package and track compatibility
Will the Package Move Reliably Through the Installed Route?
A gravity-fed device handler is suitable only when the package can pass through the track without unstable rotation, bridging, excessive friction or damage. The package drawing and the installed track kit should be reviewed together.
Compatibility areaWhat must be checkedWhat can go wrong
Body Geometry
Length, width, thickness, center of mass, chamfers, mold flash and the surfaces that contact the track.
The package rotates, tips, accelerates unevenly or reaches the stopper in an unstable position.Leads and Terminals
Lead span, pitch, coplanarity, exposed pads and possible contact with rails, guides and separators.
Leads bend, surfaces scratch, movement slows or the package bridges during release.Input Media
Tube profile, magazine, bowl or bulk feeder, device orientation, stack pressure and the transition into the machine track.
Presentation becomes inconsistent, devices double-feed or gaps and jams appear at the transfer point.Track and Device Kit
Installed rails, guides, inserts, escapements, stoppers, sensors and the package-specific adjustment range.
A machine from the correct family still cannot run the device without another track set or change parts.Process Environment
Temperature, contamination, ESD control, device fragility and whether orientation must remain fixed throughout the route.
Friction changes, sticking, cosmetic damage, ESD exposure or unreliable downstream positioning.
Choose the motion architecture
Gravity, Pick-and-Place or Turret?
The decision starts with the package route, not the handler label. Each architecture solves a different movement problem and carries a different conversion burden.
Can the Package Travel Reliably Through a Constrained Track?
This route suits repeatable tube or guided-track flow when devices can be separated, positioned and released without unstable sliding or rotation.
Main limitation: the package and track must behave consistently together.Does the Device Require Active Pickup and Controlled Placement?
A motion head moves each device between trays, carriers, sockets, nests or inspection positions when passive guided transfer is unsuitable.
Main limitation: nozzles, grippers, vision and placement force add conversion work.Must the Device Pass Through Several Indexed Stations?
A turret coordinates a repeating circular route through test, inspection, marking, sorting or packaging positions.
Main limitation: usable capability depends on the installed station sequence and tooling.
Confirm the actual machine
Record the Installed Device Route, Not Only the Model Name
The platform name describes the general architecture. The actual media modules, track kit, station hardware, jam-recovery logic and output arrangement determine whether a specific machine can support the required application.
Configuration areaWhat should be recorded
Input Module
Tube loader, magazine, bowl, bulk feeder or manual input; orientation method; sensors; capacity and the included change parts.
Track and Device Kit
Rails, guides, inserts, escapements, stoppers, separators, sensors and the exact package drawing for which the route was built.
Installed Stations
Orientation, inspection, marking, test, thermal, sorting or transfer positions, together with the interface hardware and software required to operate them.
Output and Grade Routing
Tube, tray, bin or bulk output; number of destinations; orientation requirement; grade mapping and reject protection.
Release and Jam Recovery
Escapement timing, double-feed protection, empty-track detection, jam alarms, safe release after a stop and restart behaviour.
Feeding Demonstration
The package used for the run, sample quantity, observed rotation or bridging, output separation and any missing tracks, inserts or conversion parts.
Frequently asked questions
Gravity Handler FAQ
These answers cover device compatibility, track behaviour and the information needed before equipment matching.
What is a semiconductor gravity handler?
It is a semiconductor device handling machine that uses an inclined, constrained track as the main transport route. Guides, escapements, stoppers, sensors and output modules control spacing, orientation, position and destination.
Does the device simply fall through the machine?
No. The package remains supported by tubes, rails or tracks and is released through controlled positions. Stable operation depends on package geometry, media, surface condition and the installed device kit.
Can one gravity handler run several package types?
Sometimes, but a second package may require different rails, guides, escapements, stoppers, sensors or recipes. A shared platform name does not mean the installed route supports every package in the same family.
What causes devices to jam or bridge in a gravity handler?
Common causes include unsuitable track geometry, excessive friction, contamination, lead interference, incorrect angle, unstable package orientation, double feeding and worn or misadjusted escapements.
Is every gravity handler a test handler?
No. Gravity describes the transport architecture. A gravity test handler also needs test sites, contact hardware, interface boards, tester communication and result routing tied to the electrical test.
What information is needed for a quotation?
Provide the package drawing, input and output media, required process steps, target capacity, temperature condition, existing tooling, preferred machine condition and destination country.
Request a matched configuration
Request a Quote →
Start With the Package Drawing and Required Device Route
Send the package, input media, output format, required station, target capacity and preferred condition so the available gravity handler can be checked against the application.
