# MPX/X2-THB Series Metallized Polypropylene Film Interference Suppression Capacitors (Class X2, THB)

> Boxed metallized polypropylene film capacitors for across-the-line EMI suppression in humid environments, Class X2. Rated 275–350 VAC, 1 nF–10 µF.

- Series code: MPX/X2-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, cRUus, KTL, KC
- Part numbers: 288 · [part list (JSON)](https://www.songtian-ste.com/data/parts/mpx-x2-thb.json)
- Page: https://www.songtian-ste.com/en/products/film-capacitors/mpx-x2-thb/
- Chinese version: https://www.songtian-ste.com/zh/products/film-capacitors/mpx-x2-thb/
- [Ask AI about this series](https://www.songtian-ste.com/en/products/film-capacitors/mpx-x2-thb/?ask=Help%20me%20choose%20a%20part%20from%20the%20STE%20MPX%2FX2-THB%20series.)

## Key specifications

| Parameter | Value |
| --- | --- |
| Safety class | X2, across-the-line |
| THB test | 85 °C / 85% RH · 240 VAC · 500 h |
| Rated voltage | 275 / 305 / 310 / 330 / 350 VAC |
| Capacitance | 0.001–10 µF |
| Tolerance | ±10% |
| Operating temperature | −40 °C to +110 °C |

## Engineering details

### Overview

Self-healing, boxed metallized polypropylene film capacitors for across-the-line (L–N) EMI suppression in humid environments, Class X2 to IEC / EN / UL 60384-14. Rated 275, 305, 310, 330 and 350 VAC; 1 nF–10 µF; tolerance ±10%. Biased humidity test: 85 °C / 85% RH, 240 VAC, 500 h, |ΔC/C| ≤10%. Climatic category 40/110/56.

#### Series features

- Class X2 to IEC / EN / UL 60384-14 for across-the-line (L–N) interference suppression
- Self-healing metallized polypropylene winding
- Five AC ratings: 275, 305, 310, 330 and 350 VAC; certified range 1 nF–10 µF
- THB test: 500 h at 85 °C / 85% RH and 240 VAC, |ΔC/C| ≤10%
- Flame-retardant box to UL 94 V-0 with moisture-resistant resin fill

#### Typical applications

- Across-the-line differential-mode EMI filtering
- Smart meters and metering power supplies
- LED drivers and appliance power electronics
- Capacitive power supplies, where the equipment standard and the part approval permit this duty

### Specifications

|   |   |
| --- | --- |
| Safety function | Class X2 · across-the-line (L–N) interference suppression · not for line-to-earth (Y) positions |
| Construction | Non-inductive metallized polypropylene film · boxed, resin-encapsulated · self-healing |
| Reference standards | IEC / EN / UL 60384-14 · GB/T 6346.14-2023 · K 60384 |
| Rated AC voltage UR | 275 · 305 · 310 · 330 · 350 VAC |
| Capacitance range | 0.001–10 µF · available values depend on rated voltage, body size and approval scope |
| Capacitance tolerance | ±10% (K) |
| Operating temperature | −40 °C to +110 °C |
| Climatic category | 40/110/56 |
| Passive flammability | Category B (VDE) · case and resin to UL 94 V-0 |
| Dissipation factor | tan δ ≤0.1% |
| 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 | 4.3 × UR DC, 5 s |
| Voltage proof, terminals to case | 2 × UR + 1,500 VAC, min. 2,000 VAC |
| 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 40034679 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 width | W 10–42.5 mm, depending on rated voltage and capacitance |
| Body height | H 9–50 mm, depending on rated voltage and capacitance |
| Body thickness | T 4–35 mm, depending on rated voltage and capacitance |
| Lead pitch | 7.5 · 10 · 12.5 · 15 · 22.5 · 27.5 · 37.5 mm |
| Lead diameter | 0.6 mm (pitch 7.5–12.5 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 · bulk or radial tape |
| Taped seating height H | H = 20.0 ±1.0 mm |
| 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. |
| Environmental coding | E = RoHS · F = RoHS + halogen-free |
| Further data | On request: tan δ measurement conditions; dV/dt, peak and RMS current, ESR/impedance, self-heating and permissible overvoltage; dry-heat endurance, pulse count, thermal cycling, vibration and lead strength |

### Variants

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

| Variant | Body dimensions | Rated voltage / capacitance | Construction / class | Lead / land pattern | Notes |
| --- | --- | --- | --- | --- | --- |
| J · 7.5 mm | W 10 · H 9–15 · T 4–8 mm | 275–350 VAC · 0.001–0.033 µF | Metallized PP · X2 · K ±10% | P 7.5 ±0.5 · d 0.6 ±0.05 mm | Low capacitance values at minimum pitch. 330 and 350 VAC parts generally use a taller or thicker case. |
| N · 10 mm | W 13 · H 9–15.5 · T 4–8 mm | 275–350 VAC · 0.001–0.15 µF | Metallized PP · X2 · K ±10% | P 10 ±0.5 · d 0.6 ±0.05 mm | Compact range up to 0.15 µF; case size increases with rated voltage. |
| P · 12.5 mm | W 15 · H 12.5–15 · T 7–9 mm | 275–350 VAC · 0.15–0.22 µF | Metallized PP · X2 · K ±10% | P 12.5 ±0.5 · d 0.6 ±0.05 mm | Availability on request. |
| Q · 15 mm | W 18 · H 11–20 · T 5–11 mm | 275–350 VAC · 0.01–0.56 µF | Metallized PP · X2 · K ±10% | P 15 ±0.5 · d 0.8 ±0.05 mm | Main pitch for mid-range values. The same capacitance can come in different case and lead versions, identified by the full part number. |
| T · 22.5 mm | W 26.5 · H 16–22 · T 7–13 mm | 275–350 VAC · 0.15–0.82 µF | Metallized PP · X2 · K ±10% | P 22.5 ±0.5 · d 0.8 ±0.05 mm | Larger case for higher capacitance, all five voltage ratings. |
| V · 27.5 mm | W 31–32 · H 20–37 · T 11–22 mm | 275–310 VAC to 3.9 µF · 330/350 VAC to 3.3 µF | Metallized PP · X2 · K ±10% | P 27.5 ±0.5 · d 0.8 ±0.05 mm | High capacitance; the upper limit and case size depend on rated voltage. |
| L · 37.5 mm | W 41–42.5 · H 28–50 · T 14–35 mm | 275–350 VAC · 2–10 µF | Metallized PP · X2 · K ±10% | P 37.5 ±0.5 · d 1.0 ±0.05 mm | Largest case. For high-energy filter or dropper duty, verify RMS current, temperature rise, inrush and the discharge path. |

### Selection guide

Begin with the circuit position and the required X2 approval. Then select AC voltage, capacitance, humidity profile and pitch together. The 500 h THB test is an STE test; the VDE approval includes no IEC 60384-14 Annex I humidity grade.

1. **Confirm the X2 circuit position**
   Use this series across line conductors for differential-mode suppression or in a capacitive supply approved for the equipment. It is not a Y capacitor and does not provide reinforced line-to-earth insulation.
2. **Select the rated AC voltage and check mains disturbances**
   Choose 275, 305, 310, 330 or 350 VAC for the approved capacitance and body combination. Check mains tolerance, transients, repetitive pulses and the overvoltage requirements of the equipment standard. The 4.3 × UR proof test is a test condition, not a continuous operating margin.
3. **Determine capacitance, losses and current**
   Size the filter or dropper using tolerance, tan δ, frequency, RMS current and self-heating. Only an initial tan δ limit is specified; dV/dt, current and ESR data for high-current duty 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 |ΔC/C| ≤10%. Post-test tan δ and IR data and field-life correlation are available on request. Do not specify it as IEC grade IIB: certificate 40034679 includes no Annex I grade.
5. **Specify case, pitch and process**
   Specify W/H/T, pitch, lead diameter and form and packaging for each capacitance and voltage. Validate wave and hand soldering, cleaning, coating, storage and PCB creepage. Do not reflow-solder.

### Approvals & reliability

#### Approvals & qualifications

Approvals cover 1 nF–10 µF at 275–350 VAC. The VDE approval includes neither an Annex H (DC) approval nor an Annex I humidity-robustness grade.

| Agency | Standard | Certificate | Scope |
| --- | --- | --- | --- |
| CQC CQC | GB/T 6346.14-2023 | CQC19001213200 | MPX X2, 0.001–10 µF, 275/305/310/330/350 VAC, ±10% (certificate dated 14 Nov 2023). |
| VDE, ENEC VDE / ENEC | EN 60384-14:2017 | 40034679 | MPX X2, 0.001–10 µF, 275/305/310/330/350 VAC, ±10% (K), 40/110/56, passive flammability category B. No Annex H (DC) approval; no Annex I humidity grade. |
| cRUus UL / cUL | UL 60384-14 | E208107 | MPX X2, 0.001–10 µF, 275/305/310/330/350 VAC, ±10%, −40 to +110 °C. |
| KTL, KC KTL / KC | K 60384 | SU03031 family | Certificates SU03031-12001C, -12002C, -12003D, -12004D, -23001 and -23002 cover six capacitance bands up to 10 µF. Certificate copies on request. |

Each certificate covers the types and ratings listed on it.

#### Reliability tests

Initial electrical characteristics and one biased damp-heat test (500 h) are specified. IEC 60384-14 endurance and impulse test data on request.

| Test | Condition | Acceptance |
| --- | --- | --- |
| Biased damp heat (THB) | 85 ±2 °C · 85 ±2% RH · 240 VAC · 500 h | \|ΔC/C\| ≤10%; tan δ, IR, voltage-proof, visual and sample-size criteria on request |
| Voltage proof, terminal to terminal | 4.3 × UR DC, 5 s | Ramp rate, trip current, repeat-test rule and post-test limits on request |
| Voltage proof, terminals to case | 2 × UR + 1,500 VAC, min. 2,000 VAC | Test duration, electrode method and trip current by case size on request |
| Initial dissipation factor and insulation resistance | tan δ ≤0.1%; IR ≥15,000 MΩ (CR ≤0.33 µF) or time constant ≥5,000 s (CR >0.33 µF) | IR measured at 100 VDC, 60 s |

### Design notes

#### X2 is an across-the-line safety function

Use X2 between supply conductors for differential-mode interference suppression. Line-to-earth positions require the correct Y class; do not infer an insulation function from the box style or the high proof voltage.

#### Voltage rating is part-specific

The series covers 275–350 VAC, but case size, capacitance and approval marking must match the ordered part number. Select for mains tolerance and the impulse category of the equipment standard, not nominal line voltage alone.

#### Check current and pulse load

A filter or capacitive dropper sees continuous RMS current, switching pulses, inrush and self-heating. Request dV/dt, peak-current, ESR/impedance and temperature-rise data for the actual waveform.

#### THB test is not a lifetime rating

The THB test is 500 h at 85 °C / 85% RH and 240 VAC with a capacitance-change limit. The VDE certificate includes no Annex I grade. Lifetime estimates need the full qualification report and the application mission profile.

#### Design the discharge and failure path

Across-the-line capacitance affects stored energy, touch-safe discharge time and leakage and current budgets. Coordinate the bleeder network, fusing and open- and short-circuit failure analysis with the equipment safety standard.

#### Protect the film construction during assembly

Use the specified wave- or hand-soldering profile, keep the iron at least 2 mm from the case and do not reflow-solder. Validate cleaning, conformal coating, lead forming, PCB spacing and storage away from corrosive gases.

### Part numbering

Example ordering code. Not every combination is available.

`X2 · P2 · 104 · K · Q · 1 · B0 · 180 · 120 · 060 · E · S · 8`

| Code | Meaning |
| --- | --- |
| X2 | Safety class X2 and series |
| P2 | Rated voltage: P2 = 275 VAC; Q2 = 305, Q3 = 310, R1 = 330, R2 = 350 VAC |
| 104 | Capacitance code: 104 = 100 nF |
| K | Capacitance tolerance: K = ±10% |
| Q | Lead pitch: Q = 15 mm; J = 7.5, N = 10, P = 12.5, T = 22.5, V = 27.5, L = 37.5 mm |
| 1 | Lead form: 1 = long straight; 2 = inner-bent, 5 = straight taped, 6 = bent taped |
| B0 | Lead length: B0 = 20.0 mm (codes B0–B9) |
| 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 |
| S | Case color: S = yellow; E = gray |
| 8 | STE internal management code |

## Datasheets & approval documents

- [Datasheet: MPX/X2-THB series box-type metallized polypropylene (PP) film EMI suppression capacitors, Class X2, 85 °C / 85 % RH (THB) type — 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%E5%8F%8C85%E5%9E%8B%E6%8A%97%E5%B9%B2%E6%89%B0%E7%94%B5%E5%AE%B9%E5%99%A8%28MPX%20X2-THB%29%E7%AE%80%E7%89%88%E8%A7%84%E6%A0%BC%E4%B9%A6-202402.pdf) — PDF · Chinese · 2024-02 · 373 KB
- [Certificate: MPX series Class X2 film capacitor safety approval certificates (2023-11)](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-X2%E8%96%84%E8%86%9C%E7%94%B5%E5%AE%B9%E5%99%A8%EF%BC%88MPX%29%E5%AE%89%E8%A7%84%E8%AE%A4%E8%AF%81%E8%AF%81%E4%B9%A6%EF%BC%882023%E5%B9%B411%E6%9C%88%E7%89%88%E6%9C%AC%EF%BC%89.pdf) — PDF · Chinese · 2023-11 · 5.6 MB

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