The most commonly used imperial package size codes for chip passive components (resistors, capacitors, inductors), where the numbers represent the length × width in hundredths of an inch, with fixed conversions to metric millimeter sizes.
I. Size Conversion and Specification Summary
| Imperial Size | Imperial Length × Width (inch) | Metric Length × Width (mm) | Metric Code | Typical Thickness (mm) | Application Positioning |
| 01005 | 0.010×0.005 | 0.4×0.2 | 402 | ≈0.13 | Ultra-miniature, high-density portable devices |
| 0201 | 0.020×0.001 | 0.6×0.3 | 603 | ≈0.23 | Miniaturized mobile phones / wearables |
| 0402 | 0.040×0.020 | 1.0×0.5 | 1005 | ≈0.35 | Mainstream consumer electronics |
| 0603 | 0.060×0.030 | 1.6×0.8 | 1608 | ≈0.45 | General, industrial control / main household appliances |
| 0805 | 0.080×0.050 | 2.0×1.25 | 2012 | ≈0.55 | Power / stability priority scenarios |
II. Characteristics and Applicable Scenarios of Each Size
01005 (0.4×0.2mm) It is currently one of the smallest sizes in mass production, requiring extremely high precision from SMT equipment.
Applicable: TWS earphones, smartwatches, high-end smartphones, and other ultra-miniaturized PCBs.
Process challenges: Difficulty in placement, soldering, and rework, with strict control over soldering yield.
0201 (0.6×0.3mm) A mainstream miniature package for portable devices, balancing cost-effectiveness and miniaturization.
Applicable: Smartphones, tablets, fitness bands, small IoT modules.
Equipment requirements: High-precision pick-and-place machines, fine stencil apertures.
0402 (1.0×0.5mm)The most common mid-miniature package in consumer electronics, balancing density and manufacturability.
Applicable: Routers, set-top boxes, automotive head units, laptops, security cameras.
Advantages: Moderate difficulty in soldering/rework, high yield in tape-and-reel packaging.
0603 (1.6×0.8mm) A primary package for industrial control, home appliances, and automotive electronics, prioritizing reliability.
Applicable: Industrial control boards, power supply boards, automotive BMS, main control units in home appliances.
Advantages: Better heat dissipation, stronger resistance to vibration/mechanical stress.
0805 (2.0×1.25mm) The preferred choice for larger size, high power/high voltage withstand.
Applicable: Power filtering, power circuits, high-voltage capacitors, high-power sampling resistors. Higher capacitance/power ratings under the same specifications, better thermal stability
III. Key Principles for Selection
Space priority: Portable/wearables → 01005/0201
Balance of cost-effectiveness + reliability: Consumer electronics → 0402/0603
Power/withstand voltage/heat dissipation priority: Power supplies/industrial control/automotive-grade → 0603/0805
Smaller sizes demand higher precision, anti-static properties, and hot-seal strength for carrier and cover tapes, as well as more advanced placement and inspection equipment.
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