# CY Series Safety Certified Disc Ceramic Capacitors (Class X1/Y1)

> Leaded disc ceramic safety capacitors, Class X1/Y1 to IEC 60384-14. X1 up to 760 VAC, Y1 up to 500 VAC, 100–10,000 pF.

- Series code: CY
- Product line: [Ceramic capacitors](https://www.songtian-ste.com/en/products/ceramic-capacitors/) › Safety disc capacitors (X1/Y1, X1/Y2, Y2)
- Approvals: UL, VDE, ENEC, CQC
- Part numbers: 83 · [part list (JSON)](https://www.songtian-ste.com/data/parts/cy-y1.json)
- Page: https://www.songtian-ste.com/en/products/ceramic-capacitors/cy-y1/
- Chinese version: https://www.songtian-ste.com/zh/products/ceramic-capacitors/cy-y1/
- [Ask AI about this series](https://www.songtian-ste.com/en/products/ceramic-capacitors/cy-y1/?ask=Help%20me%20choose%20a%20part%20from%20the%20STE%20CY%20series.)

## Key specifications

| Parameter | Value |
| --- | --- |
| Safety class | X1 / Y1 (IEC 60384-14) |
| Rated voltage | X1 760 VAC · Y1 500 VAC · 1,500 VDC (Y5U/Y5V) |
| Capacitance | 100–10,000 pF |
| Lead spacing | 10.0 mm |
| Operating temperature | −40 °C to +125 °C |
| Approvals | CQC · VDE/ENEC · UL/cUL |

## Engineering details

### Overview

Leaded disc ceramic safety capacitors, Class X1/Y1 to IEC 60384-14, for line-to-line, line-to-earth and reinforced-insulation EMI suppression. X1 up to 760 VAC, Y1 up to 500 VAC, 100–10,000 pF. Designated Y5U and Y5V constructions are certified for 1,500 VDC. Operating temperature −40 °C to +125 °C.

#### Series features

- Class X1/Y1 for mains EMI suppression and reinforced-insulation positions
- X1 up to 760 VAC and Y1 up to 500 VAC within the approval scope
- 1,500 VDC approval for designated Y5U and Y5V constructions
- Dielectrics Y5P, Y5U and Y5V, 100–10,000 pF
- Flame-retardant epoxy-coated radial construction, −40 °C to +125 °C

#### Typical applications

- Line-to-earth (common-mode) noise suppression where the end-equipment standard requires Y1
- Primary-to-secondary coupling in switch-mode power supplies and isolated converters
- Across-the-line (L–N) X1 suppression within the rated X1 voltage
- Solar, industrial automation, lighting and appliance power inputs with high AC or DC bus voltage

### Specifications

|   |   |
| --- | --- |
| Safety class | X1 / Y1 · IEC 60384-14 |
| Rated voltage, X1 | 760 · 500 · 440 · 400 VAC |
| Rated voltage, Y1 | 500 · 400 · 250 VAC |
| Rated DC voltage | 1,500 VDC · designated Y5U / Y5V only |
| Capacitance range | 100–10,000 pF, depending on dielectric |
| Capacitance by dielectric | Y5P 100–2,200 pF · Y5U 330–4,700 pF · Y5V 1,000–10,000 pF |
| Capacitance tolerance | K ±10% · M ±20%, depending on part |
| Operating temperature | −40 °C to +125 °C |
| Climatic category | 40/125/21 |
| Passive flammability | Class B · flame-retardant epoxy coating |
| Measuring conditions | 25 °C · 1 kHz · 1 Vrms |
| Dissipation factor | ≤2.5% |
| Insulation resistance | ≥10,000 MΩ |
| Dielectric strength | 4,000 VAC · test conditions per datasheet |
| Lead spacing | 10.0 ±0.5 mm |
| Lead diameter | 0.60 or 0.65 ±0.05 mm, depending on part |
| Body dimensions | D max. 7.0–17.5 mm · T max. 4.5–6.0 mm, depending on part |
| Impulse, endurance and damp-heat data | On request |
| Environmental compliance | RoHS · REACH · bromine-free / halogen-free |

### Variants

Ranges by dielectric, package and lead style within this series.

| Variant | Body dimensions | Certified capacitance range | Tolerance / DC rating | Lead / land pattern | Notes |
| --- | --- | --- | --- | --- | --- |
| Y5P | D max. 7.0–17.5 · T max. 4.5–6.0 mm | 100–2,200 pF | K ±10% · AC ratings only; no 1,500 VDC rating | F 10.0 ±0.5 · d 0.60/0.65 ±0.05 mm | Lower-capacitance EMI and coupling positions where temperature stability matters more than maximum value. |
| Y5U | D max. 7.0–15.5 · T max. 5.5–6.0 mm | 330–4,700 pF | K ±10% or M ±20% · 1,500 VDC for designated parts | F 10.0 ±0.5 · d 0.60/0.65 ±0.05 mm | Mid-range capacitance with AC ratings and 1,500 VDC for designated parts. |
| Y5V | D max. 7.0–16.5 · T max. 5.5–6.0 mm | 1,000–10,000 pF | M ±20% · 1,500 VDC for designated parts | F 10.0 ±0.5 · d 0.60/0.65 ±0.05 mm | Highest capacitance; check effective capacitance and leakage-current margin with particular care. |

### Selection guide

Start from the circuit position and insulation requirement in the equipment standard. Then define AC/DC voltage, impulse duty, leakage current (set by capacitance), dielectric behavior and approval scope. A dual X1/Y1 marking does not replace qualification of the ordered part in its operating environment.

1. **Classify the circuit position**
   Identify line-to-line, line-to-earth or primary-to-secondary use from the end-equipment standard. Y1 bridges reinforced insulation; the insulation diagram and overvoltage category of the equipment govern the choice.
2. **Define AC, DC and impulse duty**
   Choose the X1 and Y1 voltage combination, then include repetitive peaks and abnormal transients. The 1,500 VDC approval applies only to designated Y5U/Y5V constructions, not to Y5P.
3. **Set the capacitance limit from leakage current**
   Calculate line-frequency current and touch/leakage current at maximum mains voltage and frequency, including tolerance. Use the lowest capacitance that meets the common-mode attenuation target.
4. **Choose dielectric and tolerance**
   Y5P, Y5U and Y5V cover different value ranges and temperature characteristics. Data on capacitance versus temperature, voltage and frequency is available on request when the circuit depends on effective rather than nominal capacitance.
5. **Confirm mechanical and approval codes**
   Confirm disc diameter, thickness, lead diameter, lead form, bulk or tape packaging, environmental code and approvals for the final part number before PCB and BOM release.

### Approvals & reliability

#### Approvals & qualifications

Approval scopes differ by dielectric, capacitance, voltage and tolerance.

| Agency | Standard | Certificate | Scope |
| --- | --- | --- | --- |
| CQC CQC | IEC 60384-14:2013 + AMD1:2016 | CQC23001374885 | CY X1/Y1, 100–10,000 pF; X1 760/500/440/400 VAC, Y1 500/400/250 VAC; Y5P/Y5U/Y5V, tolerance K/M, climatic category 40/125/21, passive flammability class B; Annex H for Y5U/Y5V. Issued 28 Jan 2023, valid subject to surveillance. |
| VDE, ENEC VDE / ENEC | DIN EN 60384-14 / EN 60384-14 | 40056133 | CY X1/Y1 with the AC ratings above, 100–10,000 pF. Annex H: 1,500 VDC for Y5U/Y5V only. No Annex I humidity-robustness grade is assigned. |
| UL UL / cUL | UL 60384-14 / Canadian component recognition | E208107 | Recognized component, USA and Canada: X1 400/440/500/760 VAC, Y1 250/400/500 VAC; Y5P 100–2,200 pF; higher-K constructions 330–10,000 pF, including 1,500 VDC. |

Each certificate covers the types and ratings listed on it.

### Design notes

#### Y1 selection starts with the insulation diagram

Use Y1 only where the equipment standard, rated mains voltage, overvoltage category, pollution degree, creepage and clearance support the complete reinforced-insulation system. The capacitor approval does not cover the surrounding PCB or enclosure.

#### Capacitance sets line-frequency current

For line-to-earth use, calculate I = 2πfCV at maximum frequency, voltage and capacitance tolerance. Check the result against touch-current and leakage-current limits before using values near 10 nF.

#### 1,500 VDC depends on the dielectric

The DC approval (VDE Annex H) is limited to Y5U and Y5V. The 4 kVAC dielectric-strength test is neither a DC working rating nor an impulse rating.

#### Impulse and damp-heat data

Impulse waveform and level, endurance and 85 °C / 85% RH test data are available on request when surge or high-humidity lifetime is design-critical. No Annex I humidity-robustness grade is assigned.

#### Soldering, storage and lead stress

Hand rework: iron 350 °C max., 3 s max., at least 2 mm from the coating. Store unopened parts for up to 12 months at ≤35 °C and ≤70% RH, away from corrosive gases. Form and support leads without loading the ceramic body.

### Part numbering

Example ordering code. Not every combination is available.

`Q · 09 · F · 1 · D · 222 · M · N0 · B · 0 · C · 0 · N · 0`

| Code | Meaning |
| --- | --- |
| Q | Rated-voltage family code (Y1) |
| 09 | Body diameter code: 09 = 9 mm |
| F | Temperature characteristic: F = Y5V |
| 1 | Lead form: 1 = long straight leads |
| D | Lead spacing: D = 10.0 mm |
| 222 | Capacitance code: 222 = 2,200 pF |
| M | Capacitance tolerance: M ±20% |
| N0 | Lead length or tape seating-height code, depending on packaging |
| B | Packaging: B = bulk, T = tape |
| 0 | Environmental code: 0 = RoHS; a RoHS + halogen-free code is also defined |
| C | Approval voltage combination code: C or K, by required AC/DC rating |
| 0 · N · 0 | Internal management codes |

## Datasheets & approval documents

- [Datasheet: CY series safety ceramic disc capacitors, X1 760 VAC / Y1 500 VAC / 1500 VDC — short-form datasheet (2023-10)](https://www.songtian-ste.com/documents/source-cn/%E9%99%B6%E7%93%B7%E7%94%B5%E5%AE%B9%E5%99%A8%E7%B3%BB%E5%88%97%E4%BA%A7%E5%93%81%E8%A7%84%E6%A0%BC%E4%B9%A6/%E5%AE%89%E8%A7%84%E9%99%B6%E7%93%B7%E7%94%B5%E5%AE%B9%E5%99%A8-CY%E7%B3%BB%E5%88%97%28X1-760VAC%20Y1-500VAC%201500VDC%29%E7%AE%80%E7%89%88%E8%A7%84%E6%A0%BC%E4%B9%A6-202310.pdf) — PDF · Chinese · 2023-10 · 352 KB
- [Datasheet: CY series safety ceramic disc capacitors, X1 760 VAC / Y1 500 VAC — short-form datasheet (2023-10)](https://www.songtian-ste.com/documents/source-cn/%E9%99%B6%E7%93%B7%E7%94%B5%E5%AE%B9%E5%99%A8%E7%B3%BB%E5%88%97%E4%BA%A7%E5%93%81%E8%A7%84%E6%A0%BC%E4%B9%A6/%E5%AE%89%E8%A7%84%E9%99%B6%E7%93%B7%E7%94%B5%E5%AE%B9%E5%99%A8-CY%E7%B3%BB%E5%88%97%28X1-760VAC%20Y1-500VAC%29%E7%AE%80%E7%89%88%E8%A7%84%E6%A0%BC%E4%B9%A6-202310.pdf) — PDF · Chinese · 2023-10 · 353 KB
- [Certificate: CY series Class Y1 ceramic capacitor safety approval certificates (2023-02)](https://www.songtian-ste.com/documents/source-cn/%E5%AE%89%E8%A7%84%E8%AE%A4%E8%AF%81%E8%AF%81%E4%B9%A6/2-%E9%99%B6%E7%93%B7%E7%94%B5%E5%AE%B9%E5%99%A8%20Y1%EF%BC%88CY%EF%BC%89%E5%AE%89%E8%A7%84%E8%AE%A4%E8%AF%81%E8%AF%81%E4%B9%A6%202023-2-28.pdf) — PDF · Chinese · 2023-02 · 1.4 MB

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