The four terminal sampling resistor, also known as the Kelvin resistor, is mainly used for dual collection of current and voltage, reducing mutual interference between current and voltage during the measurement process, making current collection more accurate. The four terminal sampling resistor SFCA series of Huade Electronic Walter mainly consists of low resistance resistors, with resistance values ranging from 0.5m Ω to 100m Ω and a power of 0.5W.
Suzhou Walter four terminal sampling resistor SFCA series has the following advantages:
1. Wide range of volume options: 1206,2512
2. Wide range of resistance options: 1mR~25mR
3. Wide range of power options: 0.5W
4. High accuracy: △ ≤ 1%
5. Low temperature coefficient: TCR ＜ 50ppm/℃
6. High frequency response: H ＜ 5.0nH
7. Excellent low galvanic effect (EMF<0.5uV/℃)
8. How to use RoHS and REACH halogen-free standards
9. The anti welding layer complies with UL94-V0 level
10. Low inductance (<0.05uH 10MHz)
11. Simultaneously collecting current and voltage for higher accuracy
The Naming convention of the four terminal sampling resistor SFCA series of Suzhou Huade Electronic Walter are as follows:
| SFCA | 2512 | M | 0W5 | R001 | F | S |
| 1 | 2 | 3 | 4 | 5 | 6 | 7 |
1: Product series: SFCA series, metal ceramic alloy current detection resistor, Short electrode, four terminals, With lateral guide
2: Volume: 2512=6432=6.4 * 3.2mm
3: Material: M=Manganese copper alloy=MnCu alloy
4: Power: 0W5=0.5Watt
5: Resistance value: R001=0.001R=1mR
6: Accuracy: D=0.5%, F=1%
8: Product code: internal code or custom code
The selection parameters of Suzhou Huade Electronics Walter four terminal sampling resistor SFCAseries are shown in the table below:
|
Part Number |
Resistance Value (mΩ) |
Power Rating (Watt) |
Resistance Tolerance (%) |
TCR (ppm/℃) |
| SFCA1206M0W5R | 1~4 | 05 | ±1%（F） | ±100ppm |
| 5~100 | 0.5 | ±0.5%（D）±1%（F） | ±50ppm | |
| SFCA2512M1W0R | 1~4 | 0.5 | ±1%（F） | ±100ppm |
| 5~100 | 0.5 | ±0.5%（D）±1%（F） | ±50ppm |
Walter four terminal sampling resistor SFCA series functional characteristics:
|
Parameter |
Conditions |
Consent Standard |
|
Short time over load |
Power=2.5*Pr ; T=25±2℃ ; t=5s |
± (1.0%+0.5mΩ) IEC60115-1 4.13
|
|
High temp. exposure |
T=+155±2℃; t=1,000hrs |
± (1.0%+0.5mΩ) IEC60115-1 4.25 |
|
Low temp. load life |
T=-55±2℃ ; t=1,000hrs |
± (1.0%+0.5mΩ) IEC60115-1 4.25 |
|
Moisture load life |
Vtest=Vmax, ton=90min,toff=30min, T=60±2℃,RH=95%,1,000hrs |
± (2.0%+0.5mΩ) IEC60115-1 4.25 |
|
Thermal shock |
[-55℃ 30min→ R.T. 3min→ +150℃ 30min→ R.T. 3min] by 100 Continuous Cycles |
± (1.0%+0.5mΩ) IEC60115-1 4.19 |
|
Load life at 70℃ |
Vtest=Vmax ; T=70±2℃ ; t=90min On t=30min Off; 1,000hrs |
± (2.0%+0.5mΩ) IEC60115-1 4.25 |
|
Solderability |
Dipped into solder at 245±5℃ for 3±1s |
The covered area >95% IEC60115-1 4.17 |
|
Resistance to solder heat |
20±1s at 275±5℃ |
±（1%＋0.5mΩ） IEC60115-1 4.18 |
|
Substrate bending |
Span between fulcrums: 90mm; Bend width: 2mm; Test board: Glass-epoxy board, Thickness=1.6mm by 10 continuous cycles |
±（1%＋0.5mΩ） IEC60115-1 4.33 |
|
Mechanical shock |
a=100G for 11ms, 5 Pulse |
±（1%＋0.5mΩ） IEC60115-1 4.21 |
