# MPY/Y2-THB Series Metallized Polypropylene Film Interference Suppression Capacitors (Class Y2, THB)

> Boxed metallized polypropylene film capacitors for line-to-earth EMI suppression in humid environments, Class Y2. Rated 250–350 VAC, 1 nF–1.2 µF.

- Series code: MPY/Y2-THB
- Product line: [Film capacitors](https://www.songtian-ste.com/en/products/film-capacitors/) › Damp-heat capacitors (THB, 85 °C / 85 % RH)
- Approvals: CQC, VDE, ENEC, CB, UL
- Part numbers: 8 · [part list (JSON)](https://www.songtian-ste.com/data/parts/mpy-y2-thb.json)
- Page: https://www.songtian-ste.com/en/products/film-capacitors/mpy-y2-thb/
- Chinese version: https://www.songtian-ste.com/zh/products/film-capacitors/mpy-y2-thb/
- [Ask AI about this series](https://www.songtian-ste.com/en/products/film-capacitors/mpy-y2-thb/?ask=Help%20me%20choose%20a%20part%20from%20the%20STE%20MPY%2FY2-THB%20series.)

## Key specifications

| Parameter | Value |
| --- | --- |
| Safety class | Y2, line-to-earth |
| THB test | 85 °C / 85% RH · 240 VAC · 500 h |
| Rated voltage | 250 / 275 / 300 / 350 VAC |
| Capacitance | 0.001–1.2 µF |
| Tolerance | ±10% / ±20% |
| Operating temperature | −40 °C to +110 °C |

## Engineering details

### Overview

Boxed metallized polypropylene film capacitors for line-to-earth (L/N–PE) EMI suppression in humid environments, Class Y2 to IEC / EN / UL 60384-14, for basic or supplementary insulation. Rated 250, 275, 300 and 350 VAC; 1 nF–1.2 µF; tolerance ±10% or ±20%. Biased humidity test: 85 °C / 85% RH, 240 VAC, 500 h. Operating temperature −40 °C to +110 °C.

#### Series features

- Class Y2 to IEC / EN / UL 60384-14 for line-to-earth and bypass interference suppression
- Four AC ratings: 250, 275, 300 and 350 VAC; certified range 1 nF–1.2 µF
- THB test: 500 h at 85 °C / 85% RH and 240 VAC
- Boxed, resin-encapsulated metallized polypropylene construction; flame-retardant to UL 94 V-0

#### Typical applications

- Common-mode EMI filtering from line to protective earth
- Basic or supplementary insulation positions where Y2 is permitted
- Power-supply bypass and antenna-coupling interference suppression
- Industrial, appliance, lighting and renewable-energy filters; verify leakage current first

### Specifications

|   |   |
| --- | --- |
| Safety function | Class Y2 · line-to-earth / line-bypass EMI suppression · basic or supplementary insulation; not for reinforced-insulation (Y1) positions |
| Construction | Metallized polypropylene film · boxed, resin-encapsulated |
| Reference standards | IEC / EN / UL 60384-14 · GB/T 6346.14-2023 |
| Rated AC voltage UR | 250 · 275 · 300 · 350 VAC |
| Capacitance range | 0.001–1.2 µF · available values depend on rated voltage, body size and approval scope |
| Capacitance tolerance | ±10% (K) · ±20% (M) |
| Leakage current | Calculate the mains-frequency current from capacitance including tolerance, voltage and frequency; check it against the equipment leakage limit |
| Operating temperature | −40 °C to +110 °C |
| Climatic category / flammability | 40/110/56 · passive flammability category B |
| Dissipation factor | tan δ ≤0.15% |
| Insulation resistance, CR ≤0.33 µF | ≥15,000 MΩ at 20 °C, 100 VDC, 60 s |
| Insulation resistance, CR >0.33 µF | Time constant ≥5,000 s (T = IR \[MΩ\] × CN \[µF\]) at 20 °C, 100 VDC, 60 s |
| Voltage proof, terminal to terminal | 1,500 VAC, 1 s, or 3,500 VDC, 5 s |
| Voltage proof, terminals to case | 2 × UR + 1,500 VAC, min. 2,000 VAC |
| Impulse sequence | 24 pulses · 9 s charge / 2 s discharge cycle |
| Self-ignition test | U = UR · U1 = 5.0 kV · 20 discharges of the energy-storage capacitor per sample · 5 s interval |
| Biased humidity test (THB) | 85 ±2 °C · 85 ±2% RH · 240 VAC · 500 h |
| THB acceptance | \|ΔC/C\| ≤10%; other post-test limits on request |
| IEC 60384-14 Annex I grade | None: VDE certificate 40056386 includes no Annex I humidity-robustness grade. The 500 h THB test is an STE test, not a certified grade. |
| DC operation | No continuous DC rating; the VDE approval includes no Annex H (DC) approval |
| Body dimensions | W 10–41.5 · H 9–41 · T 4–27.5 mm, depending on rated voltage and capacitance |
| Lead pitch | 7.5 · 10 · 15 · 22.5 · 27.5 · 37.5 mm |
| Pitch codes | N 10 · Q 15 · T 22.5 · V 27.5 mm · 7.5 and 37.5 mm codes on request |
| Lead diameter | 0.6 mm (pitch 7.5–10 mm) · 0.8 mm (15–27.5 mm) · 1.0 mm (37.5 mm) |
| Lead and packing forms | Long straight · inner-bent · straight, taped · bent, taped |
| Hand soldering / rework | Iron ≤350 °C · ≤3 s · ≥2 mm from the coating |
| Reflow soldering | Not permitted; film shrinkage can degrade performance |
| Storage | In unopened package: ≤35 °C, ≤70% RH, ≤12 months. Keep away from corrosive gases to preserve lead solderability. |
| Further data | On request: impulse test voltage and test circuit; tan δ measurement conditions; voltage-proof duration, terminals to case; ESR, impedance, RMS current, self-heating and frequency derating; leakage and failure-current behavior, dry-heat life, dV/dt, current, thermal and mechanical qualification data |

### Variants

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

| Variant | Body dimensions | Rated voltage / capacitance | Construction / class | Lead / land pattern | Notes |
| --- | --- | --- | --- | --- | --- |
| 7.5 mm | W 10 · H 9–15 · T 4–8 mm | 250–350 VAC · 0.001–0.0039 µF | Metallized PP · Y2 · K/M | P 7.5 ±0.5 · d 0.6 ±0.05 mm | Smallest body. |
| N · 10 mm | W 13 · H 9–15 · T 4–7 mm | 250–350 VAC · 0.001–0.01 µF | Metallized PP · Y2 · K/M | P 10 ±0.5 · d 0.6 ±0.05 mm | — |
| Q · 15 mm | W 18 · H 12–21 · T 6–12 mm | 250–350 VAC · 0.01–0.047 µF | Metallized PP · Y2 · K/M | P 15 ±0.5 · d 0.8 ±0.05 mm | Includes larger cases for higher rated voltages. |
| T · 22.5 mm | W 26 · H 17–23 · T 8.5–13 mm | 250–350 VAC · 0.047–0.1 µF | Metallized PP · Y2 · K/M | P 22.5 ±0.5 · d 0.8 ±0.05 mm | Mid-capacitance range. Availability on request. |
| V · 27.5 mm | W 31–31.5 · H 20–30.5 · T 11–22 mm | 250–350 VAC · 0.1–0.33 µF | Metallized PP · Y2 · K/M | P 27.5 ±0.5 · d 0.8 ±0.05 mm | Leakage current rises with capacitance; check it against the equipment limit. |
| 37.5 mm | W 41.5 · H 28–41 · T 14–27.5 mm | 250–350 VAC · 0.39–1.2 µF | Metallized PP · Y2 · K/M | P 37.5 ±0.5 · d 1.0 ±0.05 mm | High capacitance values may exceed tight equipment leakage limits. |

### Selection guide

Start with the insulation position: Class Y2 is a line-bypass class for basic or supplementary insulation where the equipment standard permits it. It does not replace Y1 in reinforced-insulation positions. Then define leakage current, AC voltage, capacitance, impulse and humidity requirements and dimensions.

1. **Confirm that Y2 is permitted**
   Use Y2 from line to protective earth or in a bypass position only when the insulation architecture and equipment standard permit basic or supplementary insulation. Use Y1 where reinforced insulation or the higher impulse class is required.
2. **Calculate leakage current first**
   Use the capacitance including tolerance, the mains voltage and frequency to calculate line-frequency current. Include all Y capacitors and other leakage paths in the equipment limit.
3. **Select voltage and check impulse data**
   Choose 250–350 VAC for the approved construction. The impulse test voltage, circuit, waveform and source impedance are available on request.
4. **Match the THB test to the mission profile**
   The THB test is 500 h at 85 °C / 85% RH and 240 VAC, with a capacitance-change limit only. Certificate 40056386 grants no Annex I grade. Post-test tan δ, IR and voltage-proof data and field-life correlation are available on request.
5. **Specify geometry and process**
   Specify W/H/T, pitch, lead diameter and form and packing for each capacitance and voltage. Check PCB creepage and clearance, and do not reflow-solder.

### Approvals & reliability

#### Approvals & qualifications

CQC, VDE/ENEC, IECEE CB and UL/cUL approvals cover MPY Y2 from 1 nF to 1.2 µF at 250–350 VAC. VDE certificate 40056386 includes neither an Annex H (DC) approval nor an Annex I humidity grade.

| Agency | Standard | Certificate | Scope |
| --- | --- | --- | --- |
| CQC CQC | GB/T 6346.14-2023 + AMD1:2016 | CQC23001379254 | MPY Y2, 0.001–1.2 µF, 250/275/300/350 VAC, ±10% (K) or ±20% (M), passive flammability category B, 40/110/56. Issued 10 Mar 2023. |
| VDE, ENEC VDE / ENEC | EN 60384-14 | 40056386 | MPY Y2, 0.001–1.2 µF, 250/275/300/350 VAC, K/M, climatic category 40/110/56, passive flammability category B. No Annex H (DC) approval; no Annex I humidity grade. |
| IECEE CB IECEE CB | IEC 60384-14 | DE1-67208 | MPY Y2, 1 nF–1.2 µF, K/M, 250/275/300/350 VAC, 40/110/56/B. Test report 300758-TL3-1. |
| UL UL / cUL | UL 60384-14 | E208107 | MPY Y2, 0.001–1.2 µF, 250/275/300/350 VAC, −40 to +110 °C, tolerance K/M. No humidity grade. |

Each certificate covers the types and ratings listed on it.

#### Reliability tests

Voltage proof, an impulse test sequence, a self-ignition test and a biased damp-heat test (500 h) are specified.

| Test | Condition | Acceptance |
| --- | --- | --- |
| Impulse test | 24 pulses · 9 s charge / 2 s discharge | Test voltage, circuit and post-test limits on request |
| Self-ignition test | U = UR · U1 = 5.0 kV · 20 discharges per sample · 5 s interval | Test energy and pass criteria on request |
| Biased damp heat (THB) | 85 ±2 °C · 85 ±2% RH · 240 VAC · 500 h | \|ΔC/C\| ≤10%; post-test tan δ, IR, voltage-proof, visual and sample-size criteria on request |

### Design notes

#### Y2 does not provide reinforced insulation

Use Y2 for line-to-earth EMI suppression where basic or supplementary insulation is allowed. Reinforced primary-to-secondary barriers and higher impulse requirements need a Y1 capacitor with the corresponding approval.

#### Leakage current sets the usable capacitance

Higher Y capacitance improves common-mode attenuation but raises mains-frequency current. Sum every Y capacitor and leakage path at maximum voltage, frequency and tolerance, and compare the total with the equipment standard.

#### Voltage rating is part-specific

The approvals include 350 VAC; availability by voltage rating on request. Use the marking, body size and certificate scope of the ordered part number.

#### THB test is not a certified humidity grade

The THB test is 500 h at 85 °C / 85% RH and 240 VAC; the VDE approval includes no Annex I grade. Lifetime in humid service needs the full test report, post-test electrical limits and mission-profile correlation.

#### Spacing, assembly and failure path

Define PCB creepage and clearance, lead form, soldering, cleaning and coating; do not reflow-solder. Coordinate protective-earth integrity, fusing and open- and short-circuit failure analysis with the equipment standard.

### Part numbering

Example ordering code. Not every combination is available.

`Y2 · Q1 · 103 · K · Q · 1 · B0 · 180 · 120 · 060 · E · V · 8`

| Code | Meaning |
| --- | --- |
| Y2 | Safety class Y2 and series |
| Q1 | Rated voltage: Q1 = 300 VAC; E2 = 250, P2 = 275, R2 = 350 VAC |
| 103 | Capacitance code: 103 = 10 nF |
| K | Capacitance tolerance: K = ±10%; M = ±20% |
| Q | Lead pitch: Q = 15 mm; N = 10, T = 22.5, V = 27.5 mm. 7.5 and 37.5 mm codes on request. |
| 1 | Lead form: 1 = long straight; 2 = inner-bent, 5 = straight taped, 6 = bent taped |
| B0 | Lead length: B0 = 20.0 mm |
| 180 | Body width: 180 = 18.0 mm |
| 120 | Body height: 120 = 12.0 mm |
| 060 | Body thickness: 060 = 6.0 mm |
| E | Environmental: E = RoHS; F = RoHS + halogen-free |
| V | Case color: V = blue; E = gray |
| 8 | STE internal management code |

## Datasheets & approval documents

- [Datasheet: MPY/Y2-THB series box-type metallized polypropylene (PP) film EMI suppression capacitors, Class Y2 — short-form datasheet (2024-02)](https://www.songtian-ste.com/documents/source-cn/%E9%87%91%E5%B1%9E%E8%86%9C%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%8F%8C85%E7%B3%BB%E5%88%97/%E7%9B%92%E5%BC%8F%E9%87%91%E5%B1%9E%E5%8C%96%E8%81%9A%E4%B8%99%E7%83%AF%E8%86%9C%E6%8A%97%E5%B9%B2%E6%89%B0%E7%94%B5%E5%AE%B9%E5%99%A8%EF%BC%88MPY%20Y2-THB%EF%BC%89%E7%AE%80%E7%89%88%E8%A7%84%E6%A0%BC%E4%B9%A6-202402.pdf) — PDF · Chinese · 2024-02 · 347 KB
- [Certificate: MPY series Class Y2 film capacitor safety approval certificates (2023-03)](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%A6/3-Y2%E8%96%84%E8%86%9C%E7%94%B5%E5%AE%B9%E5%99%A8%EF%BC%88MPY%EF%BC%89%E5%AE%89%E8%A7%84%E8%AE%A4%E8%AF%81%E8%AF%81%E4%B9%A6-2023%E5%B9%B43%E6%9C%88%E7%89%88%E6%9C%AC.pdf) — PDF · Chinese · 2023-03 · 1.4 MB

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