| Image | Part Number | Description / PDF | Quantity | Rfq |
|---|---|---|---|---|
 |
Walsin Technology |
RES 7.68M OHM 1% 1/4W 1206 |
0 |
|
 |
Walsin Technology |
RES 1M OHM 5% 1/8W 0805 |
5000 |
|
 |
Walsin Technology |
RES 4.99M OHM 1% 1/4W 1206 |
0 |
|
 |
Walsin Technology |
RES 121 OHM 1% 1/4W 1206 |
0 |
|
 |
Walsin Technology |
RES 121K OHM 1% 1/4W 1206 |
0 |
|
 |
Walsin Technology |
RES 4.32 OHM 1% 1/8W 0805 |
0 |
|
 |
Walsin Technology |
RES 100K OHM 5% 1/4W 1206 |
4000 |
|
 |
Walsin Technology |
RES 220 OHM 5% 1/8W 0805 |
10000 |
|
 |
Walsin Technology |
RES 8.45K OHM 1% 1/4W 1206 |
0 |
|
 |
Walsin Technology |
RES 34K OHM 1% 1/4W 1206 |
0 |
|
 |
Walsin Technology |
RES 2.37K OHM 1% 1/4W 1206 |
0 |
|
 |
Walsin Technology |
RES 7.87M OHM 1% 1/20W 0201 |
0 |
|
 |
Walsin Technology |
RES 33K OHM 1% 1/20W 0201 |
29995 |
|
 |
Walsin Technology |
RES 3.74 OHM 1% 1/20W 0201 |
0 |
|
 |
Walsin Technology |
RES 1.54 OHM 1% 1/4W 1206 |
0 |
|
 |
Walsin Technology |
RES 3.32 OHM 1% 1/8W 0805 |
0 |
|
 |
Walsin Technology |
RES 470 OHM 1% 1/20W 0201 |
15000 |
|
 |
Walsin Technology |
RES 22.6 OHM 1% 1/4W 1206 |
0 |
|
 |
Walsin Technology |
RES 220K OHM 5% 1/8W 0805 |
10000 |
|
 |
Walsin Technology |
RES 1.18 OHM 1% 1/4W 1206 |
0 |
|
Surface Mount Chip Resistors (SMD Resistors) are passive electronic components designed to limit current flow and divide voltages in printed circuit boards (PCBs). As key elements in Surface Mount Technology (SMT), they enable high-density PCB layouts and automated manufacturing. Their miniaturized footprint and reliability make them essential for modern electronics, including smartphones, automotive systems, and industrial equipment.
| Type | Functional Characteristics | Application Examples |
|---|---|---|
| Thick Film Resistors | Cost-effective, standard tolerance ( 1%-5%), power ratings up to 1W | Consumer electronics, power supplies |
| Thin Film Resistors | High precision ( 0.01%), low noise, stable temperature coefficients | Medical devices, precision instrumentation |
| Power Resistors | High power dissipation (up to 3W), robust thermal management | Motor drives, EV battery management systems |
| Network Resistors | Multiple resistors in single package, matched temperature coefficients | Digital circuits, memory modules |
| Wirewound Resistors | High inductance, precise low-resistance values | Audio amplifiers, industrial control systems |
Typical SMD resistors consist of: - Ceramic substrate (Alumina, 96% Al2O3) - Resistive layer (Ruthenium oxide for thick film, Nichrome for thin film) - Termination electrodes (Ni/Sn or Ag/Pd metallization) - Protective coating (Epoxy or glass encapsulation) Standard packages follow EIA dimensions (e.g., 0402, 0603, 0805).
| Parameter | Description | Importance |
|---|---|---|
| Resistance Range | 1 to 10M (film), 0.1 to 100k (power) | Determines current control capability |
| Tolerance | 0.01% (precision) to 5% (general) | Impacts circuit accuracy |
| Power Rating | 0.05W to 3W @ 70 C | Defines thermal dissipation limits |
| TCR | 5ppm/ C (thin film) to 200ppm/ C | Affects stability over temperature |
| Operating Temp | -55 C to +155 C | Defines environmental reliability |
| Voltage Coefficient | <0.1ppm/V | Ensures voltage stability |
| Manufacturer | Representative Series | Key Features |
|---|---|---|
| Yageo | CRCW Series | 0.05W-1W, 0.1% tolerance |
| Vishay | CRCWE Series | Thin film, TCR 25ppm/ C |
| ROHM | MCR Series | Power resistors up to 2W |
| Ohmite | PWR Series | High-power 3W devices |
| Bourns | CRCU Series | Network resistors with 8-element arrays |
Consider: - Required resistance tolerance and power rating - Operating temperature range (automotive needs -40 C to +125 C) - Package size constraints (e.g., 0402 for mobile devices) - Long-term stability requirements (medical applications prefer thin film) - Cost vs. performance trade-offs (consumer vs. industrial use) Example: For smartphone power management, select 0603 thick film resistors with 1% tolerance and 125 C rating.
Key trends include: - Miniaturization: Development of 0201 and 01005 packages - Higher precision: Sub-0.01% tolerance thin film resistors - Enhanced thermal management: New materials for power densities >1W/mm - Automotive growth: AEC-Q200 qualified parts for EVs - Smart manufacturing: AI-driven resistor selection tools - Sustainability: Lead-free and halogen-free material adoption