ST Series
EMI / RFI Filters
Switching Transient Filters
Specifications
| Voltage rating: | 115/250 VAC |
|---|---|
| Line frequency: | 50/60 Hz |
| Leakage current (line to ground):* | 0.50 mA max at 115 V, 60 Hz (A,B,D Circuits) 1.00 mA max at 250 V, 50 Hz (A,B,D Circuits) 2.00 mA max at 115 V, 60 Hz (C Circuit) 3.00 mA max at 250 V, 50 Hz (C Circuit) |
| Test Voltage: | Line to ground, 2250 VDC Line to line, 1450 VDC |
| Peak Currents: | 3 Amp Models = 17 Amp Peak Ratings 6 Amp Models = 23 Amp Peak Ratings 10 Amp Models = 34 Amp Peak Ratings |
Low leakage current models (<0.5mA@250VAC / 50Hz) may be ordered by adding the prefix “L”, e.g. LSTA-3. These units offer 6dB lower insertion loss.
Applications
These filters reduce switching transients to acceptable levels by combining common and differential mode rejection characteristics, providing optimum performance at minimum leakage current. They are particularly effective for reducing interference from line to equipment (i.e., susceptibility problems). They are also effective in reducing equipment interference to meet VDE, FCC and CISPR requirements. Switching power supplies require much higher filter rejection characteristics to enable these devices to comply with requirements of VDE 0875. Circuit D filters are designed to provide this high attenuation without impeding peak switching currents. They assist in meeting UL and IEC standards.
Certifications
UL File No. E62459, CSA File No. LR56661, TUV File No. R72080179.
Electrical Schematics
Electrical Schematic A
Electrical Schematic B
Electrical Schematic C
Electrical Schematic D
Performance
| Current Rating | Frequency (MHz) | |||||
|---|---|---|---|---|---|---|
| Common Mode | 0.15 | 0.5 | 1 | 5 | 10 | 30 |
| STA | ||||||
| 3A | 15 | 30 | 39 | 30 | 50 | 42 (db) |
| 6A | 15 | 30 | 39 | 30 | 50 | 42 (db) |
| 10A | 15 | 30 | 39 | 30 | 50 | 42 (db) |
| 20A | 15 | 30 | 38 | 23 | 43 | 40 (db) |
| 30A | 15 | 30 | 38 | 23 | 43 | 40 (db) |
| STB | ||||||
| 3A | 15 | 30 | 43 | 60 | 55 | 46 (db) |
| 6A | 15 | 30 | 43 | 60 | 55 | 46 (db) |
| 10A | 15 | 30 | 43 | 60 | 55 | 46 (db) |
| 20A | 15 | 30 | 41 | 60 | 46 | 30 (db) |
| 30A | 15 | 30 | 41 | 60 | 46 | 30 (db) |
| STC | ||||||
| 3A | 13 | 25 | 34 | 65 | 65 | 63 (db) |
| 6A | 13 | 25 | 34 | 65 | 65 | 63 (db) |
| 10A | 13 | 25 | 34 | 65 | 65 | 63 (db) |
| 20A | 13 | 30 | 35 | 65 | 65 | 53 (db) |
| 30A | 13 | 30 | 35 | 65 | 65 | 53 (db) |
| STD | ||||||
| 3A | 65 | 70 | 70 | 70 | 65 | 55 (db) |
| 6A | 65 | 70 | 70 | 70 | 65 | 55 (db) |
| 10A | 65 | 70 | 70 | 70 | 65 | 55 (db) |
| 20A | 30 | 60 | 60 | 50 | 45 | 45 (db) |
| 30A | 30 | 60 | 60 | 50 | 45 | 45 (db) |
| Differential Mode | ||||||
| STA | ||||||
| 3A | 40 | 65 | 65 | 55 | 50 | 50 (db) |
| 6A | 40 | 65 | 65 | 55 | 50 | 50 (db) |
| 10A | 40 | 65 | 65 | 55 | 50 | 50 (db) |
| 20A | 40 | 65 | 65 | 65 | 53 | 50 (db) |
| 30A | 40 | 65 | 65 | 65 | 53 | 50 (db) |
| STB | ||||||
| 3A | 25 | 65 | 65 | 60 | 55 | 50 (db) |
| 6A | 25 | 65 | 65 | 60 | 55 | 50 (db) |
| 10A | 25 | 65 | 65 | 60 | 55 | 50 (db) |
| 20A | 40 | 65 | 65 | 65 | 60 | 55 (db) |
| 30A | 40 | 65 | 65 | 65 | 60 | 55 (db) |
| STC | ||||||
| 3A | 25 | 65 | 65 | 62 | 55 | 38 (db) |
| 6A | 25 | 65 | 65 | 62 | 55 | 38 (db) |
| 10A | 25 | 65 | 65 | 62 | 55 | 38 (db) |
| 20A | 28 | 65 | 65 | 65 | 65 | 65 (db) |
| 30A | 28 | 65 | 65 | 65 | 65 | 65 (db) |
| STD | ||||||
| 3A | 60 | 70 | 70 | 70 | 60 | 60 (db) |
| 6A | 60 | 70 | 70 | 70 | 60 | 60 (db) |
| 10A | 60 | 70 | 70 | 70 | 60 | 60 (db) |
| 20A | 50 | 70 | 70 | 70 | 60 | 60 (db) |
| 30A | 50 | 70 | 70 | 70 | 60 | 60 (db) |
Minimum insertion loss in 50 ohm system per MIL-STD-220A.
Ordering Information
| Current Rating | Part Number | Dimensions (mm) | ||||
|---|---|---|---|---|---|---|
| A | B | C | D | E | ||
| 3A | STA-3 | 50.80 | 44.45 | 28.70 | 60.45 | 69.85 |
| STB-3 | 50.80 | 44.45 | 28.70 | 60.45 | 69.85 | |
| STC-3 | 50.80 | 44.45 | 28.70 | 60.45 | 69.85 | |
| STD 3 | 133.35 | 50.80 | 44.45 | 143.00 | 152.15 | |
| 6A | STA-6 | 50.80 | 44.45 | 28.70 | 60.45 | 69.85 |
| STB-6 | 50.80 | 44.45 | 28.70 | 60.45 | 69.85 | |
| STC-6 | 50.80 | 44.45 | 28.70 | 60.45 | 69.85 | |
| STA-6L | 63.50 | 50.80 | 38.10 | 74.68 | 84.32 | |
| STB-6L | 63.5 | 50.80 | 38.10 | 74.68 | 84.32 | |
| STC-6L | 63.5 | 50.80 | 38.10 | 74.68 | 84.32 | |
| STD 6 | 133.35 | 63.50 | 57.15 | 143.00 | 152.15 | |
| 10A | STA-10 | 63.5 | 50.80 | 38.10 | 74.68 | 84.32 |
| STB-10 | 63.5 | 50.80 | 38.10 | 74.68 | 84.32 | |
| STC-10 | 63.5 | 50.80 | 38.10 | 74.68 | 84.32 | |
| STD 10 | 133.35 | 63.50 | 69.85 | 143.00 | 152.15 | |
| 20A | STA-20 | 98.55 | 84.07 | 38.10 | 95.25 | 104.65 |
| STB-20 | 98.55 | 84.07 | 38.10 | 95.25 | 104.65 | |
| STC-20 | 98.55 | 84.07 | 38.10 | 95.25 | 104.65 | |
| STD 20 | 133.35 | 76.20 | 76.20 | 143.00 | 152.15 | |
| 30A | STA-30 | 133.35 | 76.20 | 76.20 | 143.00 | 152.15 |
| STB-30 | 133.35 | 76.20 | 76.20 | 143.00 | 152.15 | |
| STC-30 | 133.35 | 76.20 | 76.20 | 143.00 | 152.15 | |
| STD 30 | 203.20 | 101.60 | 88.90 | 219.20 | 233.17 | |
0.250 Tab Terminals extend 14.73mm.
Mounting Hole Diameters are 4.78mm.
How To Define A Part Number
| Series | Electrical Schematic | - | Current Rating |
|---|---|---|---|
| ST | A | - | 3 |
Case Styles
STA-3, STB-3, STC-3, STA-6, STB-6 and STC-6
STA-6L, STB-6L, STC-6L, STA-10, STB-10 and STC-10
STA-20, STB-20 and STC-20
STD-3, STD-6 and STD-10
STD-20, STA-30, STB-30, STC-30 and STD-30
Specifications subject to change.