# Automotive CY Series Safety Certified Ceramic Capacitors (Class X1/Y1, AEC-Q200)

> Automotive radial ceramic safety capacitors, Class X1 760 VAC / Y1 500 VAC, 100–4,700 pF. AEC-Q200 qualified part numbers available.

- Series code: CY-A
- Product line: [Ceramic capacitors](https://www.songtian-ste.com/en/products/ceramic-capacitors/) › Safety disc capacitors (X1/Y1, X1/Y2, Y2)
- Also listed in: [Automotive](https://www.songtian-ste.com/en/products/automotive/)
- Approvals: CQC, VDE, ENEC, UL · AEC-Q200 qualified part numbers available
- Part numbers: 41 · [part list (JSON)](https://www.songtian-ste.com/data/parts/automotive-cy-y1.json)
- Page: https://www.songtian-ste.com/en/products/ceramic-capacitors/automotive-cy-y1/
- Chinese version: https://www.songtian-ste.com/zh/products/ceramic-capacitors/automotive-cy-y1/
- [Ask AI about this series](https://www.songtian-ste.com/en/products/ceramic-capacitors/automotive-cy-y1/?ask=Help%20me%20choose%20a%20part%20from%20the%20STE%20CY-A%20series.)

## Key specifications

| Parameter | Value |
| --- | --- |
| Safety class | X1 760 VAC / Y1 500 VAC (IEC 60384-14) |
| Automotive qualification | AEC-Q200 qualified part numbers available |
| Capacitance | Y5P 100–2,200 pF · Y5U 330–4,700 pF |
| Temperature cycling | 1,000 cycles, −55 °C to +125 °C |
| Lead spacing | 10.0 mm |
| Approvals | CQC · VDE/ENEC · UL/cUL |

## Engineering details

### Overview

Radial disc ceramic safety capacitors for automotive power electronics, Class X1 760 VAC / Y1 500 VAC to IEC 60384-14, for EMI suppression and coupling across reinforced insulation. Y5P 100–2,200 pF and Y5U 330–4,700 pF. AEC-Q200 qualified part numbers available; 85 °C / 85% RH for 1,000 h; 1,000 temperature cycles from −55 °C to +125 °C.

#### Series features

- Class X1 760 VAC / Y1 500 VAC to IEC 60384-14 for automotive power-conversion interfaces
- Dielectrics Y5P 100–2,200 pF and Y5U 330–4,700 pF
- AEC-Q200 qualified part numbers available; 85 °C / 85% RH for 1,000 h; 1,000 temperature cycles from −55 °C to +125 °C
- Safety approvals: CQC, VDE/ENEC, UL/cUL

#### Typical applications

- Primary-to-secondary EMI coupling in on-board chargers and isolated DC/DC converters where Y1 is required
- Line-to-earth (common-mode) filtering in EV/HEV/PHEV charging and power-conversion equipment
- Across-the-line (L–N) X1 suppression, where the selected part and the equipment standard permit it
- BMS, charging-pile and automotive switch-mode power supply interfaces; check leakage, impulse duty and mission profile

### Specifications

|   |   |
| --- | --- |
| Function | Radial single-layer ceramic safety capacitor for X1/Y1 EMI suppression and isolation coupling. The capacitor alone is not a complete reinforced-insulation system or equipment approval. |
| Safety class | IEC 60384-14 · X1 760 VAC / Y1 500 VAC |
| Reinforced insulation | Y1 supports reinforced-insulation positions only when creepage, clearance, pollution degree, overvoltage and abnormal-condition design of the equipment also comply |
| Automotive qualification | AEC-Q200 qualified part numbers available; AEC-Q200 revision, qualification report and qualified part-number list on request |
| Damp heat | 85 °C / 85% RH, 1,000 h |
| Annex I humidity grade | Not assigned in VDE approval 40056133; the 85/85 test is not an Annex I grade IIIB rating |
| Temperature cycling | 1,000 cycles, −55 °C to +125 °C |
| Climatic category | 40/125/21 (CQC, VDE) |
| Operating temperature | −40 °C to +125 °C (approval range); operating grade and voltage derating on request |
| Capacitance range | Y5P 100–2,200 pF (12 values) · Y5U 330–4,700 pF (12 values) |
| Capacitance tolerance | Y5P K ±10% · Y5U K ±10% up to 820 pF, M ±20% from 1,000–4,700 pF |
| Body dimensions, Y5P | D max. 7.5–18.0 · T max. 5.0–6.5 mm, depending on value |
| Body dimensions, Y5U | D max. 7.5–17.0 · T max. 6.0–6.5 mm, depending on value |
| Leads | F 10.0 ±0.5 mm · d 0.60 or 0.65 ±0.05 mm, depending on part |
| Measuring conditions | Capacitance and dissipation factor at 25 °C · 1 kHz · 1 Vrms |
| Dissipation factor | ≤2.5% (initial) |
| Insulation resistance | ≥10,000 MΩ |
| Dielectric strength | 4,000 VAC |
| DC rating | Rated for X1/Y1 AC. VDE Annex H covers 1,500 VDC for Y5U/Y5V only; DC rating of individual part numbers on request |
| Leakage current | No component limit specified; calculate from maximum C, f and V and check the touch-current budget of the equipment |
| Lead forms and coating extension | Long straight · short straight · single outer-bent · front/rear raised; coating extension ≤2.5 mm (body ≤10 mm) or ≤3.0 mm (body >10 mm) where applicable |
| Bulk lead length | Long straight ≥16.0 mm · short/bent 2.5–<6.0 mm ±0.5 or 6.0–10.0 mm ±1.0 |
| Taping | F 10 mm; P0 12.7 / P 25.4 mm or P0 15 / P 15 mm; 18 mm carrier tape; seating height depends on lead form |
| Wave soldering | Preheat 30–130 s to 115 °C · rapid rise to 260 °C max. · solder ≤10 s · cooling ≤5 °C/s; validate immersion depth and board thermal mass |
| Hand rework | 360 °C max. · 3 s max. · solder joint ≥2 mm from coating |
| Further data on request | Damp-heat bias voltage, sample size, recovery and post-test limits · temperature-cycling dwell, transfer time and post-test limits · insulation-resistance measuring voltage and charging time · dielectric-strength frequency, duration and ramp · Y1 impulse voltage, 1.2/50 µs waveform, polarity and number of pulses · capacitance versus temperature, AC/DC bias, frequency and aging for Y5P, Y5U and Y5V · reflow suitability, cleaning and coating compatibility, lead-forming limits, storage conditions and shelf life · endurance, biased humidity, vibration, mechanical shock, lead strength and solder-heat test results |

### Selection guide

Start from the insulation diagram of the equipment and the maximum continuous AC/DC voltage. Then check Y-capacitor leakage, effective capacitance, impulse duty, AEC-Q200 and approval scope, humidity and cycling data, dimensions, marking and assembly process for one part number.

1. **Classify the insulation and circuit position**
   Identify line-to-earth, primary-to-secondary or across-the-line duty from the equipment standard. Confirm reinforced or basic insulation, pollution degree, creepage, clearance and abnormal conditions before selecting Y1 or X1.
2. **Define continuous AC, DC and impulse voltage**
   Use the approval voltage code of the selected part. 1,500 VDC applies only to Y5U/Y5V under VDE Annex H. Y1 impulse waveform, polarity, count and acceptance on request. The 4 kVAC proof test is not an impulse or working rating.
3. **Set capacitance from EMI and leakage together**
   Calculate common-mode attenuation and I = 2πfCV at maximum voltage, frequency and tolerance for every Y capacitor. Use temperature, bias, frequency and aging curves so that nominal capacitance is not mistaken for effective capacitance.
4. **Request automotive and safety documentation**
   Request the AEC-Q200 revision and report, qualified part numbers, grade, site, stress groups, sample sizes, results and PPAP/change control, together with the current CQC, VDE and UL scope for the same marking and construction.
5. **Confirm body, leads, packing and process**
   Check the drawing, blue coating and marking, lead form and length, taping, soldering, cleaning, storage and post-process acceptance of the selected part number. Availability of Y5V and values above 4,700 pF on request.

### Approvals & reliability

#### Approvals & qualifications

AEC-Q200 stress qualification and IEC 60384-14 safety approvals are separate. The approvals below cover the CY construction. Approval and AEC-Q200 coverage of individual part numbers on request.

| 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, 40/125/21, class B; Annex H for Y5U/Y5V. Issued 28 Jan 2023, valid subject to surveillance. |
| VDE, ENEC VDE / ENEC | DIN EN / EN 60384-14 | 40056133 | CY X1/Y1, 100–10,000 pF, AC ratings as above; Annex H 1,500 VDC for Y5U/Y5V only. No Annex I humidity grade assigned. |
| UL UL / cUL | UL / Canadian 60384-14 component recognition | E208107 | Recognized component, USA and Canada: Y5P 100–2,200 pF, Y5U/Y5V 330–10,000 pF, X1/Y1 AC ratings, 1,500 VDC for higher-K constructions, −40 °C to +125 °C. |

Each certificate covers the types and ratings listed on it.

### Design notes

#### Y1 is part of a complete insulation system

Select from the insulation diagram of the equipment, not from the capacitor marking alone. PCB creepage and clearance, pollution degree, accessible conductors, enclosure, protective earth and abnormal tests remain system responsibilities.

#### Calculate leakage at maximum conditions

Use maximum capacitance, tolerance, line frequency and voltage for each Y capacitor and total the complete network. Keep margin for the temperature, bias and aging behavior of the dielectric and for the touch-current limits of the equipment.

#### Keep proof, impulse and working voltage apart

X1/Y1 AC ratings, the 1,500 VDC Annex H scope, the 4 kVAC proof test and a Y1 impulse test are different quantities. Check each value and its test method for the selected part and circuit position.

#### Safety approval and AEC-Q200 are separate

CQC, VDE and UL approvals confirm the safety classification of the component. They do not establish automotive stress qualification, PPAP, site traceability or mission-profile life. Both must apply to the same part number.

#### Y5V and values above 4,700 pF

The automotive range covers Y5P and Y5U up to 4,700 pF. For Y5V, 10 nF or other code options, availability and electrical, dimensional, marking, packing and qualification data on request.

#### Control the radial assembly process

Observe the wave-soldering profile and the 360 °C hand-rework limit. Keep heat and bending stress away from the coating. Review cleaning, coating, storage, shelf-life and vibration data before production.

### Part numbering

Example ordering code. Not every combination is available.

`Q · 09 · B · 1 · D · 471 · K · N0 · B · 2 · C · Q · N · 0`

| Code | Meaning |
| --- | --- |
| Q | Rated-voltage code: Q = Y1 |
| 09 | Body diameter code: 09 = 9 mm |
| B | Temperature characteristic: B = Y5P, E = Y5U, F = Y5V |
| 1 | Lead form: 1 = long straight, 2 = single outer-bent, 3 = short straight, 8 = front/rear raised |
| D | Lead spacing: D = 10.0 mm |
| 471 | Capacitance code: 471 = 470 pF |
| K | Capacitance tolerance: K ±10%, M ±20% |
| N0 | Lead length or taped seating-height code, depending on lead form and packing |
| B | Packaging: B = bulk, T = tape |
| 2 | Environmental code: 2 = RoHS + halogen-free, 0 = RoHS |
| C | Marking and approval voltage code: C = X1 760 VAC / Y1 500 VAC |
| Q | Automotive product code |
| N | Internal management code |
| 0 | Internal management code |

## Datasheets & approval documents

- [Datasheet: Automotive CY series safety ceramic disc capacitors, X1 760 VAC / Y1 500 VAC — short-form datasheet (2023-12)](https://www.songtian-ste.com/documents/source-cn/%E8%BD%A6%E8%A7%84-%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%E8%BD%A6%E8%A7%84%E7%B3%BB%E5%88%97%29%E7%AE%80%E7%89%88%E8%A7%84%E6%A0%BC%E4%B9%A6-202312%281%29.pdf) — PDF · Chinese · 2023-12 · 446 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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