Product Overview
The Bel Fuse SCS series represents a new line of high-frequency Surface Mount Current Sensing Transformers, specifically designed for operating frequencies ranging from 50kHz to 1MHz. These transformers offer a compact and cost-effective solution for accurately sensing current flow in a non-invasive manner within power supply, feedback control, safety, and control circuits. Available in the SCS4.4, SCS4.6, and SCS8.3 series, they feature the smallest footprint and most compact size on the market, enabling precise current detection from 7A up to 15A. Their low DC resistance and suitability for automatic pick-and-place processes make them ideal for various applications including switching power supplies, DC-DC converters/chargers, motor control, and overload sensing.
Product Attributes
- Brand: Bel Fuse (Signal Transformer)
- Series: SCS4.4, SCS4.6, SCS8.3
- Technology: Surface Mount Technology (SMT)
- Certifications: RoHS Compliant
- Packaging: Tape & Reel
- Customization: Custom versions available upon request.
Technical Specifications
| Specification | Details |
| Operating Frequency | 50 kHz to 1 MHz |
| Sensed Current Range | 7 A to 15 A |
| EE Core Sizes | 4.4 mm (SCS4.4), 4.6 mm (SCS4.6), 8.3 mm (SCS8.3) |
| Primary Rated Sensed Current | 7 A (SCS4.4), 9 A (SCS4.6), 15 A (SCS8.3) |
| Temperature Rise | Less than 35C / 40C (SCS4.4 /SCS4.6) above 25C ambient at primary current. Higher current causes increased rise. |
| Operating Temperature Range | -40 C to +125 C |
| Storage Temperature | -40 C to +165 C |
| Isolation (Hipot) | 500 Vrms / 1 min (SCS4.4 /SCS4.6); 1.5 kVAC /3 mA / 1 s (SCS8.3) |
| General Features | Very low DC resistance, Different turns ratios, Designed for automatic pick and place |
| Product Identification Format | SCS - [Core Size] - [Turns Ratio] - TR (e.g., SCS-4-6-100T-TR) |
| Packaging Quantity (pcs) | SCS4.4: 2000 | SCS4.6: 2500 | SCS8.3: 350 |
| Applications | Switching power supplies, Feedback control, Overload sensing, Motor control, Load drop/shut down detection, LCD televisions, Notebook PCs, Portable communication equipment, DC-DC converters |
| Part Number | Turns Ratio Sec : Pri | Secondary Inductance Min (mH) @ 100 kHz | DCR Primary Max () | DCR Secondary Max () | Primary Current Max (A) |
| SCS-4-4-20T-TR | 20:1 | 0.033 | 0.003 | 0.35 | 7 |
| SCS-4-4-30T-TR | 30:1 | 0.074 | 0.003 | 0.80 | 7 |
| SCS-4-4-40T-TR | 40:1 | 0.132 | 0.003 | 1.60 | 7 |
| SCS-4-4-50T-TR | 50:1 | 0.205 | 0.003 | 2.50 | 7 |
| SCS-4-4-60T-TR | 60:1 | 0.295 | 0.003 | 3.60 | 7 |
| SCS-4-4-70T-TR | 70:1 | 0.400 | 0.003 | 4.60 | 7 |
| SCS-4-4-100T-TR | 100:1 | 0.820 | 0.003 | 9.50 | 7 |
| SCS-4-4-125T-TR | 125:1 | 1.280 | 0.003 | 13.0 | 7 |
| SCS-4-4-150T-TR | 150:1 | 1.800 | 0.003 | 21.0 | 7 |
| SCS-4-6-20T-TR | 20:1 | 0.053 | 0.0015 | 0.42 | 9 |
| SCS-4-6-50T-TR | 50:1 | 0.333 | 0.0015 | 2.76 | 9 |
| SCS-4-6-70T-TR | 70:1 | 0.652 | 0.0015 | 5.04 | 9 |
| SCS-4-6-100T-TR | 100:1 | 1.330 | 0.0015 | 10.68 | 9 |
| SCS-4-6-150T-TR | 150:1 | 2.993 | 0.0015 | 22.30 | 9 |
| SCS-8-3-20T-TR | 20:1 | 0.22 | 0.0039 | 0.21 | 15 |
| SCS-8-3-30T-TR | 30:1 | 0.50 | 0.0039 | 0.32 | 15 |
| SCS-8-3-40T-TR | 40:1 | 0.88 | 0.0039 | 0.50 | 15 |
| SCS-8-3-50T-TR | 50:1 | 1.40 | 0.0039 | 0.65 | 15 |
| SCS-8-3-60T-TR | 60:1 | 2.00 | 0.0039 | 0.81 | 15 |
| SCS-8-3-70T-TR | 70:1 | 2.70 | 0.0039 | 1.00 | 15 |
| SCS-8-3-80T-TR | 80:1 | 3.50 | 0.0039 | 1.30 | 15 |
| SCS-8-3-100T-TR | 100:1 | 5.60 | 0.0039 | 2.00 | 15 |
| SCS-8-3-125T-TR | 125:1 | 8.70 | 0.0039 | 5.20 | 15 |
| SCS-8-3-150T-TR | 150:1 | 12.60 | 0.0039 | 6.50 | 15 |
| SCS-8-3-200T-TR | 200:1 | 22.00 | 0.0039 | 8.00 | 15 |
| Series | Dimensions (mm) A Max | Dimensions (mm) B Max | Dimensions (mm) C Max | Dimensions (mm) E Max | Dimensions (mm) F Max | Dimensions (mm) G Max | Dimensions (mm) H Max | Dimensions (mm) I Max | Dimensions (mm) J Max |
| SCS4.4 | 4.70 | 3.65 | 3.55 | 0.4 | - | - | - | - | - |
| SCS4.6 | 5.20 | 7.20 | 2.80 | 0.4 | 1.2 | 2.6 | 1.2 | 1.1 | 1.2 |
| SCS8.3 | 11.00 | 13.0 | 2.52 | 0.7 | - | - | 7.8 | - | - |
| Series | Packaging Quantity (pcs) | Pcs / Reel | Pcs / Small carton | Pcs / Outer carton |
| SCS4.4 | 2000 | 8000 | 32000 |
| SCS4.6 | 2500 | 10000 | 40000 |
| SCS8.3 | 350 | 1050 | 4200 |
