# MEMB/CL23 Series Miniature Metallized Polyester Film Capacitors

> Miniature boxed metallized polyester (PET) film capacitors with 5 mm lead spacing for space-constrained DC circuits. 63–630 VDC, 1 nF–1 µF.

- Series code: MEMB/CL23
- Product line: [Film capacitors](https://www.songtian-ste.com/en/products/film-capacitors/) › Metallized polyester (PET) film capacitors
- Part numbers: 112 · [part list (JSON)](https://www.songtian-ste.com/data/parts/cl23.json)
- Page: https://www.songtian-ste.com/en/products/film-capacitors/cl23/
- Chinese version: https://www.songtian-ste.com/zh/products/film-capacitors/cl23/
- [Ask AI about this series](https://www.songtian-ste.com/en/products/film-capacitors/cl23/?ask=Help%20me%20choose%20a%20part%20from%20the%20STE%20MEMB%2FCL23%20series.)

## Key specifications

| Parameter | Value |
| --- | --- |
| Rated voltage | 63 / 100 / 250 / 400 / 630 VDC |
| Capacitance | 1 nF–1 µF |
| Lead spacing | 5 mm |
| Body width | 7.2 mm |
| Tolerance | ±5% / ±10% |
| Operating temperature | −40 °C to +125 °C |

## Engineering details

### Overview

Miniature metallized polyester (PET) film capacitors with a non-inductive, self-healing winding in a resin-sealed plastic box, for bypass, blocking, coupling, decoupling, filtering, timing and low-pulse circuits. Rated 63, 100, 250, 400 and 630 VDC, 1 nF–1 µF, J ±5% or K ±10%. Body width 7.2 mm, lead spacing 5 mm. Operating temperature −40 °C to +125 °C, with voltage derating at high temperature.

#### Series features

- Metallized PET film, non-inductive winding, compact box with 5 mm lead spacing
- Rated 63, 100, 250, 400 and 630 VDC; 1 nF to 1 µF
- Body width 7.2 mm; height 6.5–11 mm; thickness 2.5–6 mm
- Self-healing; flame-retardant case and resin; −40 °C to +125 °C operation

#### Typical applications

- Bypass, blocking, coupling and decoupling on dense boards
- Filtering and low-pulse circuits; validate dV/dt, current, frequency and temperature rise
- Timing and oscillator circuits; include PET dielectric absorption, drift and loss in the error budget
- Compact radial-lead PCB assemblies; check body size, packing, soldering and lifetime per part number

### Specifications

|   |   |
| --- | --- |
| Product type | Miniature boxed metallized polyester DC film capacitor for bypass, blocking, coupling, decoupling, filtering, timing and low-pulse circuits; not a safety capacitor, not for reflow soldering |
| Construction | Metallized polyethylene terephthalate (PET) film · non-inductive winding · plastic box with resin encapsulation |
| Self-healing | Yes |
| Rated DC voltage | 63 · 100 · 250 · 400 · 630 VDC |
| Capacitance range | 1 nF–1 µF in 32 preferred values |
| Maximum capacitance by voltage | 63 / 100 VDC: 1 µF · 250 VDC: 150 nF · 400 VDC: 47 nF · 630 VDC: 15 nF |
| Capacitance tolerance | J ±5% · K ±10% |
| Operating temperature | −40 °C to +125 °C |
| Voltage derating | Required at high temperature. Derating curve on request; obtain it before operation above +85 °C |
| Climatic category | 40/105/21 |
| Storage temperature | +15 °C to +35 °C |
| Dissipation factor | tan δ ≤1.0% at 1 kHz, 1.0 Vrms, 20 °C |
| Insulation resistance, UR >100 V, C ≤0.33 µF | ≥30,000 MΩ at 100 VDC, 60 s, 20 °C |
| Insulation resistance, UR >100 V, C >0.33 µF | Time constant IR × C ≥10,000 s at 100 VDC, 60 s, 20 °C |
| Insulation resistance, UR ≤100 V, C ≤0.33 µF | ≥15,000 MΩ at 10 VDC, 60 s, 20 °C |
| Insulation resistance, UR ≤100 V, C >0.33 µF | Time constant IR × C ≥5,000 s at 10 VDC, 60 s, 20 °C |
| Voltage proof, terminal to terminal | 1.6 × UR for 5 s |
| AC operation | DC-rated only; do not use in AC, resonant or capacitive-dropper circuits without frequency, current and lifetime data from STE |
| Safety class | No X/Y class and no agency approval; do not use across the line or line to earth |
| Flame retardancy | Flame-retardant case and resin |
| Body dimensions | W 7.2 ±0.5 · H 6.5–11.0 ±0.5 · T 2.5–6.0 ±0.5 mm; H and T depend on voltage and capacitance |
| Lead spacing and diameter | P 5.0 ±1.0 mm · d 0.5 ±0.05 mm |
| Lead forms and packing | Long straight · inner-bent · straight taped · bent taped |
| Soldering profile, PP | Preheat ≤110 °C · soldering ≤120 °C · ≤15 s |
| Soldering profile, PE | Preheat ≤125 °C · soldering ≤160 °C · ≤15 s |
| Hand soldering | 350 °C max. · 3 s max. · ≥2 mm from the case |
| Reflow soldering | Not permitted; film shrinkage can degrade performance |
| Environmental compliance | RoHS and REACH compliant; bromine-free and halogen-free. Material declarations on request. |
| Further data | On request: clearing energy, capacitance loss and end-of-life limits · storage humidity and shelf life · dV/dt, K0, peak and repetitive current, pulse energy and repetition rate · ESR, thermal resistance, hot-spot rise and lead-temperature limits of the 5 mm body · ESL, impedance, self-resonance, permissible voltage and current versus frequency, dielectric absorption and drift · UL 94 class · loaded-life, pulse-life, damp-heat, overload, thermal-cycle, vibration and lead-strength test results |

### Variants

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

| Variant | Body dimensions | Rated voltage / capacitance | Dielectric / tolerance / package | Lead / land pattern | Notes |
| --- | --- | --- | --- | --- | --- |
| D · 5 mm | W 7.2 · H 6.5–11 · T 2.5–6 mm | 63–630 VDC · 1 nF–1 µF; maximum value depends on voltage | Metallized PET · J/K · boxed, resin-sealed | P 5.0 ±1.0 · d 0.5 ±0.05 mm | Single 5 mm size for dense radial-lead assemblies; H/T, loss, current and lifetime per part number. |

### Selection guide

Start with the board-space constraint and the duty: filtering, timing or low pulse. Then check voltage, capacitance, frequency loss, pulse current, dielectric stability, temperature derating, self-heating of the compact body, lifetime and dimensions.

1. **Define waveform, stability and space constraints**
   Specify DC bias, AC ripple, frequency spectrum, peak voltage, rise and fall time, dV/dt, repetition rate, RMS current, allowed absorption or drift error, ambient temperature, board spacing, cooling and service hours.
2. **Select voltage and capacitance**
   Maximum capacitance depends on voltage: 63/100 VDC to 1 µF, 250 VDC to 150 nF, 400 VDC to 47 nF and 630 VDC to 15 nF. For higher values or other voltages, request the part specification.
3. **Calculate pulse, loss and self-heating**
   Use Ipk = C·dV/dt and the measured spectrum. Obtain dV/dt, repetitive and RMS current, ESR, impedance, self-resonance, thermal-resistance and hot-spot-rise data for the selected part number.
4. **Check derating and PET stability**
   Obtain the voltage–temperature derating curve before operation above +85 °C, together with dielectric absorption, capacitance and loss versus temperature and frequency, drift and loaded-life data.
5. **Confirm dimensions and assembly**
   Match the part number to voltage code, capacitance, tolerance, W/H/T, 5 mm lead spacing, lead form, packing, marking and soldering profile. Do not use reflow soldering; validate forming stress, cleaning, vibration and thermal cycling.

### Design notes

#### Maximum capacitance depends on voltage

The 1 nF–1 µF range does not apply at every voltage. Keep 250 VDC at or below 150 nF, 400 VDC at or below 47 nF and 630 VDC at or below 15 nF unless the part specification states otherwise.

#### Compact size has thermal and electrical tradeoffs

A 5 mm boxed body saves board area but limits the thermal surface and changes winding geometry. Verify current, ESR, hot-spot rise and lifetime for the exact voltage and capacitance.

#### Quantify pulse and oscillator duty

Calculate I = C·dV/dt and obtain dV/dt, repetitive-current, frequency and temperature-rise limits for the part number before pulse or oscillator use.

#### Obtain the high-temperature derating curve

For operation above +85 °C, obtain the voltage derating curve, case or hot-spot limit and loaded-life data.

#### Control PET timing error

For timing, coupling and precision signal circuits, include dielectric absorption, capacitance and loss versus temperature and frequency, drift, aging and bias history in the error budget.

#### Control heat and lead stress during assembly

Do not use reflow soldering. Follow the soldering profile, keep forming stress away from the case seal, and validate cleaning, coating, vibration and thermal cycling.

### Part numbering

Example ordering code. Not every combination is available.

`3B · 2A · 224 · J · D · 1 · B0 · 072 · 100 · 050 · E · S · 0`

| Code | Meaning |
| --- | --- |
| 3B | Series code: MEMB/CL23 |
| 2A | Rated voltage code: 2A = 100 VDC; 1J = 63 VDC, 2E = 250 VDC, 2G = 400 VDC; 630 VDC code on request |
| 224 | Capacitance code: 224 = 220 nF; maximum value depends on voltage |
| J | Capacitance tolerance: J = ±5%, K = ±10% |
| D | Lead spacing: D = 5 mm |
| 1 | Lead form: 1 = long straight, 2 = inner-bent, 5 = straight taped, 6 = bent taped |
| B0 | Lead length code: B0 = 20.0 mm |
| 072 | Body width: 072 = 7.2 mm |
| 100 | Body height: 100 = 10.0 mm; depends on voltage and capacitance |
| 050 | Body thickness: 050 = 5.0 mm; depends on voltage and capacitance |
| E | Environmental code: E = RoHS, F = RoHS and halogen-free |
| S | STE internal control code, first field |
| 0 | STE internal control code, second field |

## Datasheets & approval documents

- [Datasheet: MEMB/CL23 series miniature box-type metallized polyester (PET) film capacitors — short-form datasheet (2023-10)](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/MPE%E8%81%9A%E8%84%82%E8%86%9C%E7%94%B5%E5%AE%B9%E5%99%A8/%E5%B0%8F%E5%9E%8B%E7%9B%92%E5%BC%8F%E9%87%91%E5%B1%9E%E5%8C%96%E8%81%9A%E9%85%AF%E8%86%9C%E7%94%B5%E5%AE%B9%E5%99%A8%28MEMB%20CL23%29%E7%AE%80%E7%89%88%E8%A7%84%E6%A0%BC%E4%B9%A6-202310.pdf) — PDF · Chinese · 2023-10 · 288 KB

## More in polyester (PET) film capacitors

- [MEB/CL21B Series Box-Type Metallized Polyester Film Capacitors](https://www.songtian-ste.com/en/products/film-capacitors/cl21b/)
- [MEF/CL21 Series Metallized Polyester Film Capacitors](https://www.songtian-ste.com/en/products/film-capacitors/cl21/)
- [MEF/CL21X Series Compact Metallized Polyester Film Capacitors](https://www.songtian-ste.com/en/products/film-capacitors/mef-cl21x/)