Overview

A lead frame is the stamped or etched metal skeleton that carries a semiconductor die and provides the electrical leads and heat path of a packaged IC. micro IC lead frame for electric motors programs are driven by motor-driver packages: high pin counts, fine pitch, and the need for reliable current carrying in a small, vibration-prone module. Photochemical etching forms the fingers, die pad and half-etched locking features in one copper-alloy sheet, so a new pin layout is a new film rather than a progressive die.

Compared with stamping, etching holds fine fingers down to 0.10 mm without burrs or coplanarity drift, and it images half-etched lead-roughening and pad recesses in the same pass. Frames are made in C194/C7025 copper alloys, Kovar or Alloy 42 between 0.10 mm and 0.50 mm, with selective Ag/Ni/Pd plating on the bond areas. That is why micro IC lead frame for electric motors is used for motor-driver ICs, power-device frames, sensor packages and connector leads where fine pitch, flatness and plating quality must hold across reel-to-reel volume.

Parameter Window

• Available Materials: C194/C7025 copper alloys, Kovar, Alloy 42, pure copper
• Material Thickness Range: 0.10–0.50 mm
• Tolerance: ±0.015 mm on finger width, ±0.02 mm on outline
• Minimum Feature: 0.10 mm finger width, 0.15 mm pitch, half-etch depth ±0.01 mm
• Surface Options: selective Ag/Ni/Pd plating, anti-tarnish, roughening half-etch
• Compliance: ISO 9001 process control, RoHS/REACH material traceability

Manufacturing Process / Workflow (8 Steps)

1. Artwork & DFM Review — Convert the lead pattern into vector artwork and check finger width, pitch and half-etch zones against 0.10–0.50 mm stock.
2. Material Selection — Choose C194/C7025 copper, Kovar or Alloy 42 and confirm temper, conductivity and flatness.
3. Cleaning & Lamination — Degrease the strip and laminate dry-film photoresist on both faces for reel-to-reel processing.
4. UV Exposure — Expose the lead and pad pattern through high-resolution film registered to the strip datum.
5. Development — Wash out unexposed resist to open through-cut and half-etch areas, then inspect the finest fingers.
6. Controlled Etching — Spray chemistry matched to the alloy, holding half-etch depth and finger width to ±0.015 mm.
7. Stripping & Plating — Remove resist, then apply selective Ag/Ni/Pd plating on bond and lead areas and neutralize.
8. Inspection & Packaging — Verify finger width, coplanarity and plating thickness against the approved article, then reel or tray pack.

Core Advantages

1. Fine, burr-free fingers: Etched leads hold 0.10 mm width without cut burrs that could short neighboring pins.
2. Half-etch in one pass: Pad recesses and lead-locking roughening are imaged with the outline, improving mold adhesion.
3. Stable coplanarity: No stamping force means leads stay flat for reliable wire bonding and die attach.
4. Fast layout changes: micro IC lead frame for electric motors iterations change only the film, so pin variants turn in days.
5. Selective plating: Bond areas get Ag/Ni/Pd while the rest stays bare, cutting precious-metal cost.
6. Reel-to-reel volume: Etched frames run on continuous strip for automated assembly of motor-driver packages.

Typical Applications

• Motor-driver ICs: Lead frames for brushless and stepper motor control chips.
• Power device frames: Frames for MOSFETs and power modules in drive circuits.
• Sensor packages: Fine-pitch frames for position and current sensors.
• Connector leads: Etched contact fingers for motor wiring harnesses.
• LED and opto frames: Fine leads for indicator and encoder emitters.
• Multi-chip modules: Dense frames carrying several dies in one package.

Design Notes & Process Considerations

1. Finger versus thickness: Keep the minimum finger at or above ~1× material thickness so narrow leads do not lift during etching.
2. Half-etch callout: State half-etch depth separately from through-cut dimensions to hold the locking and recess features.
3. Coplanarity: Specify lead flatness per strip, since wire bonding and molding are sensitive to any twist.
4. Plating zones: Name the plating metal, thickness and masked areas, as these drive both bond quality and cost.
5. Etch factor: Allow for sidewall undercut on fine pitch; a slightly compensated artwork holds the final finger width.
6. Reel format: Define strip width, pitch and sprocket holes for reel-to-reel assembly; agreeing these six items, a micro IC lead frame for electric motors program reaches qualification with fewer review cycles.