STE Offers SMD-X1Y1 and SMC-X1Y2 Capacitor Options
Original report
STE edition
STE SMD-X1Y1 and SMC-X1Y2 capacitors were featured in Chongdiantou coverage of compact power supplies. The two families provide different safety classes and package-specific capacitance options.
STE's SMD-X1Y1 and SMC-X1Y2 ceramic safety capacitors were highlighted in an April 2025 Chongdiantou report on compact power supplies. The article described surface mount alternatives to upright leaded Y capacitors and introduced the available package and capacitance options in each family.
Y capacitors provide a controlled capacitive path for interference suppression at connections governed by the equipment's insulation requirements. The required safety class comes first. A smaller outline or an equal capacitance does not make a Y2 component interchangeable with a Y1 component.
SMD-X1Y1 covers several package sizes
The source named the SMD-X1Y1 3225, 3222 and 4522 outlines and described a family capacitance ceiling of 4700 pF. Package-specific documents make the distinction clearer: the 3225 and 3222 lists extend from 10 to 2200 pF, while the 4522 list contains 3300 and 4700 pF options.
The report also described a 2.5 mm maximum height. The relevant drawings specify a nominal height of 2.5 ± 0.3 mm, so the positive tolerance must be included in the mechanical design. Available body dimensions do not replace the terminal and land-pattern drawings or the board's insulation clearances.
SMC-X1Y2 provides two additional outlines
The SMC-X1Y2 family offers 1815 and 2522 outlines. The March 22, 2025 specifications distinguish them by body geometry, dielectric and the list of available capacitances:
| Parameter | SMC-X1Y2 1815 | SMC-X1Y2 2522 |
|---|---|---|
| Package-table capacitance range | 10–2200 pF | 390–4700 pF |
| Listed dielectric types | SL, Y5P, Y5U, Y5V | Y5P, Y5U, Y5V |
| Body length | 4.5 ± 0.3 mm | 6.0 ± 0.1 mm |
| Body width | 3.9 ± 0.3 mm | 5.55 ± 0.1 mm |
| Body height | 2.2 ± 0.3 mm | 2.38 ± 0.1 mm |
| Rated AC voltage | 300 VAC | 300 VAC |
| Operating temperature | −40 to +125 °C | −40 to +125 °C |
The capacitance ranges describe the package tables, not a continuous choice of every value. Each dielectric has its own listed options. In particular, the 1815 table does not establish a 4700 pF option simply because a generic SMC electrical table gives a broader family range.
Keep working ratings separate from tests
The SMC documents specify a terminal-to-terminal withstand test of 2600 VAC rms for 60 seconds. They also specify insulation resistance greater than 10000 MΩ, measured after charging at 500 VDC for 60 ± 5 seconds. These are separate tests with defined conditions; neither replaces the rated 300 VAC operating voltage.
The cited SMD-X1Y1 documents specify 500 VAC and a 4000 VAC rms, 60-second terminal-to-terminal withstand test. Choosing between the families therefore requires the correct insulation classification and approval scope, as well as voltage, capacitance and mechanical fit.
What surface mount assembly changes
Chongdiantou emphasized low-profile packaging and suitability for automated placement. These are practical format choices for compact power supplies, including fast chargers. Actual production savings and reliability improvements depend on the assembly process and completed design rather than on the package description alone.
The report's references to environmental testing likewise require the relevant part and test conditions. A thermal-shock result does not establish complete automotive qualification across a family.
Engineers can compare the SMD-X1Y1 and SMC-X1Y2 families using the intended connection, capacitance, current budget and available board space. The final choice should be evaluated in the complete power supply, with its electrical, thermal and insulation requirements considered together. SMD-X1Y1 SMC-X1Y2
Technical references
- STE SMD-X1Y1 3225 specification, revision 2025-03-22, pp. 4–6.
- STE SMC-X1Y2 1815 specification, revision 2025-03-22, pp. 4–6.
- STE SMC-X1Y2 2522 specification, revision 2025-03-22, pp. 4–6.
Figures and tables from the original report
The following figures retain their original captions, markings and historical context. Transcribed tables present the values shown in the published images; product selection should use the specifications for the selected part.
| Parameter | Value in the source image |
|---|---|
| Type | SMD |
| Capacitor class | Y1: X1Y1 |
| Package dimensions | 3225 ≈ 8.1 × 6.0 mm; 3222 ≈ 8.1 × 5.5 mm; 4522 ≈ 11.4 × 5.5 mm |
| Temperature characteristic: SL | +350 ~ −1000 ppm/°C |
| Temperature characteristic: Y5P | ±10% |
| Temperature characteristic: Y5U | +22% ~ −56% |
| Temperature characteristic: Y5V | +30% ~ −80% |
| Capacitance codes | 100: 10 pF; 101: 100 pF; 102: 1000 pF |
| Capacitance tolerance | K: ±10%; M: ±20% |
| Parameter | Value in the source image |
|---|---|
| Capacitor class | X1Y1 |
| Climatic category | 40/125/21 B |
| Operating temperature | −40°C ~ 125°C |
| Rated voltage | 500 VAC |
| Capacitance range | 10 pF ~ 4700 pF |
| Dissipation factor | S (SL): D.F. ≤ 0.15%; B (Y5P), E (Y5U), F (Y5V): D.F. ≤ 2.5% |
| Dielectric test: terminals to case | 4000 VAC (rms) / 60 sec |
| Dielectric test: between terminals | 4000 VAC (rms) / 60 sec |
| Insulation resistance | >10000 MΩ (measured after charging at 500 VDC for 60 ± 5 seconds) |
Rated operating voltage and dielectric test conditions are listed separately.
| Parameter | Value in the source image |
|---|---|
| L | 8.1±0.3 |
| W | 6.0±0.3 |
| H | 2.5±0.3 |
| W1 | 2.5±0.3 |
| L1 | 10.0±0.3 |
| L2 | 11.4±0.3 |
| L3 | 0.5±0.3 |
| T | 0.15±0.01 |
| Parameter | Value in the source image |
|---|---|
| L | 8.1±0.3 |
| W | 5.5±0.3 |
| H | 2.4±0.3 |
| W1 | 2.5±0.3 |
| L1 | 10.0±0.3 |
| L2 | 11.4±0.3 |
| L3 | 0.5±0.3 |
| T | 0.15±0.01 |
| Temperature characteristic | Nominal capacitance (pF) | Part number |
|---|---|---|
| SL | 10 | SMDY1****SL100K* |
| SL | 12 | SMDY1****SL120K* |
| SL | 15 | SMDY1****SL150K* |
| SL | 18 | SMDY1****SL180K* |
| SL | 20 | SMDY1****SL200K* |
| SL | 22 | SMDY1****SL220K* |
| SL | 27 | SMDY1****SL270K* |
| SL | 30 | SMDY1****SL300K* |
| SL | 33 | SMDY1****SL330K* |
| SL | 39 | SMDY1****SL390K* |
| SL | 47 | SMDY1****SL470K* |
| SL | 56 | SMDY1****SL560K* |
| SL | 68 | SMDY1****SL680K* |
| SL | 82 | SMDY1****SL820K* |
| Y5P | 100 | SMDY1****Y5P101K* |
| Y5P | 120 | SMDY1****Y5P121K* |
| Y5P | 150 | SMDY1****Y5P151K* |
| Y5P | 180 | SMDY1****Y5P181K* |
| Y5P | 200 | SMDY1****Y5P201K* |
| Y5P | 220 | SMDY1****Y5P221K* |
| Y5P | 270 | SMDY1****Y5P271K* |
| Y5P | 300 | SMDY1****Y5P301K* |
| Y5P | 330 | SMDY1****Y5P331K* |
| Y5P | 390 | SMDY1****Y5P391K* |
| Y5P | 470 | SMDY1****Y5P471K* |
| Y5U | 560 | SMDY1****Y5U561M* |
| Y5U | 680 | SMDY1****Y5U681M* |
| Y5U | 820 | SMDY1****Y5U821M* |
| Y5U | 1000 | SMDY1****Y5U102M* |
| Y5U | 1200 | SMDY1****Y5U122M* |
| Y5U | 1500 | SMDY1****Y5U152M* |
| Y5V | 1800 | SMDY1****Y5V182M* |
| Y5V | 2000 | SMDY1****Y5V202M* |
| Y5V | 2200 | SMDY1****Y5V222M* |
The size code is 3225 or 3222. Asterisks are retained as shown in the source.
| Parameter | Value in the source image |
|---|---|
| L | 11.4±0.3 |
| W | 5.5±0.3 |
| H | 2.5±0.3 |
| W1 | 2.5±0.3 |
| L1 | 11.6±0.3 |
| L2 | 10 min |
| L3 | 0.6±0.3 |
| Parameter | Value in the source image |
|---|---|
| a | 9.0±0.3 |
| b | 3.6±0.3 |
| c | 1.7±0.3 |
| Temperature characteristic | Nominal capacitance (pF) | Part number |
|---|---|---|
| Y5V | 3300 | SMDY14522Y5V332M0 |
| Y5V | 4700 | SMDY14522Y5V472M0 |
| Parameter | Value in the source image |
|---|---|
| Type | SMC |
| Capacitor class | Y2: X1Y2 |
| Package dimensions | 1815 ≈ 4.5 × 3.9 mm; 2522 ≈ 6.0 × 5.6 mm |
| Temperature characteristic: SL | +350 ~ −1000 ppm/°C |
| Temperature characteristic: Y5P | ±10% |
| Temperature characteristic: Y5U | +22% ~ −56% |
| Temperature characteristic: Y5V | +30% ~ −80% |
| Capacitance codes | 100: 10 pF; 101: 100 pF; 102: 1000 pF |
| Capacitance tolerance | K: ±10%; M: ±20% |
| Parameter | Value in the source image |
|---|---|
| Capacitor class | X1Y2 |
| Climatic category | 40/125/21 B |
| Operating temperature | −40°C ~ 125°C |
| Rated voltage | 300 VAC |
| Capacitance range | 10 pF ~ 4700 pF |
| Dissipation factor | S (SL): D.F. ≤ 0.15%; B (Y5P), E (Y5U), F (Y5V): D.F. ≤ 2.5% |
| Dielectric test: terminals to case | 2500 VAC (rms) / 60 sec |
| Dielectric test: between terminals | 2600 VAC (rms) / 60 sec |
| Insulation resistance | >10000 MΩ (measured after charging at 500 VDC for 60 ± 5 seconds) |
Rated operating voltage and dielectric test conditions are listed separately.
| Parameter | Value in the source image |
|---|---|
| L | 4.5±0.1 |
| W | 3.9±0.1 |
| H | 2.1±0.1 |
| W1 | 1.8±0.02 |
| L1 | 5.1±0.15 |
| L2 | 4.2±0.1 |
| L3 | 0.5±0.1 |
| Parameter | Value in the source image |
|---|---|
| a | 4.0 min |
| b | 2.2±0.1 |
| c | 3.0±0.2 |
| Temperature characteristic | Nominal capacitance (pF) | Part number |
|---|---|---|
| SL | 10 | SMCY21815SL100K* |
| SL | 12 | SMCY21815SL120K* |
| SL | 15 | SMCY21815SL150K* |
| SL | 18 | SMCY21815SL180K* |
| SL | 20 | SMCY21815SL200K* |
| SL | 22 | SMCY21815SL220K* |
| SL | 27 | SMCY21815SL270K* |
| SL | 30 | SMCY21815SL300K* |
| SL | 33 | SMCY21815SL330K* |
| SL | 39 | SMCY21815SL390K* |
| SL | 47 | SMCY21815SL470K* |
| SL | 56 | SMCY21815SL560K* |
| SL | 68 | SMCY21815SL680K* |
| Y5P | 82 | SMCY21815Y5P820K* |
| Y5P | 100 | SMCY21815Y5P101K* |
| Y5P | 120 | SMCY21815Y5P121K* |
| Y5P | 150 | SMCY21815Y5P151K* |
| Y5P | 180 | SMCY21815Y5P181K* |
| Y5P | 200 | SMCY21815Y5P201K* |
| Y5P | 220 | SMCY21815Y5P221K* |
| Y5P | 270 | SMCY21815Y5P271K* |
| Y5P | 300 | SMCY21815Y5P301K* |
| Y5P | 330 | SMCY21815Y5P331K* |
| Y5U | 390 | SMCY21815Y5U391M* |
| Y5U | 470 | SMCY21815Y5U471M* |
| Y5U | 560 | SMCY21815Y5U561M* |
| Y5U | 680 | SMCY21815Y5U681M* |
| Y5U | 820 | SMCY21815Y5U821M* |
| Y5U | 1000 | SMCY21815Y5U102M* |
| Y5V | 1200 | SMCY21815Y5V122M* |
| Y5V | 1500 | SMCY21815Y5V152M* |
| Y5V | 1800 | SMCY21815Y5V182M* |
| Y5V | 2000 | SMCY21815Y5V202M* |
| Y5V | 2200 | SMCY21815Y5V222M* |
| Parameter | Value in the source image |
|---|---|
| L | 6.00±0.1 |
| W | 5.55±0.1 |
| H | 2.38±0.1 |
| W1 | 2.5±0.02 |
| L1 | 7.0±0.15 |
| L2 | 6.0±0.15 |
| L3 | 0.5±0.1 |
| Parameter | Value in the source image |
|---|---|
| a | 5.5 min |
| b | 2.2±0.1 |
| c | 3.6±0.2 |
| Temperature characteristic | Nominal capacitance (pF) | Part number |
|---|---|---|
| Y5P | 390 | SMCY22522Y5P391K* |
| Y5P | 470 | SMCY22522Y5P471K* |
| Y5P | 560 | SMCY22522Y5P561K* |
| Y5P | 680 | SMCY22522Y5P681K* |
| Y5P | 820 | SMCY22522Y5P821K* |
| Y5P | 1000 | SMCY22522Y5P102K* |
| Y5U | 1200 | SMCY22522Y5U122M* |
| Y5U | 1500 | SMCY22522Y5U152M* |
| Y5U | 1800 | SMCY22522Y5U182M* |
| Y5U | 2000 | SMCY22522Y5U202M* |
| Y5U | 2200 | SMCY22522Y5U222M* |
| Y5U | 3300 | SMCY22522Y5U332M* |
| Y5V | 3900 | SMCY22522Y5V392M* |
| Y5V | 4700 | SMCY22522Y5V472M* |
Related reading cited by the original report
Chinese source titles are retained below. 正浩、隆鑫两家知名户外电源品牌齐选松田元件 松田电子推出贴片式NTC热敏电阻器，可用于消费电子、工业设备等领域实现产品小型化 百款设备的共同选择，一文看懂松田元件历年拆解案例