Product Overview
The STE series of current sensing resistors are metal foil components designed for accurate current measurement. They offer high precision and reliability, making them suitable for various industrial and electronic applications requiring precise current monitoring.
Product Attributes
- Brand: STE series
- Material: Metal Foil (MnCu alloy, Alloy, Special)
- Substrate: Alumina Ceramic
- Protective Coating: Flame-retardant epoxy, meets UL-94-V0 requirements (Green)
- Marking Coating: Flame-retardant epoxy, meets UL-94-V0 requirements (Black)
Technical Specifications
| Part Number Series | Size (W x L x T) | Resistance Value (m) | Power Rating (Watt) | Resistance Tolerance (%) | TCR (ppm) |
| STE0603*W50-series | 0.900.20 x 1.700.20 x 0.650.20 mm | 5~60 | 0.50 | 0.5%(D) / 1%(F) | 50 / 100 |
| STE0805*W75-series | 1.350.20 x 2.100.20 x 0.650.20 mm | 3~200 | 0.75 | 0.5%(D) / 1%(F) | 50 / 100 |
| STE1206*1W0-series | 1.700.20 x 3.300.20 x 0.650.20 mm | 3~400 | 1.0 | 0.5%(D) / 1%(F) | 50 / 100 |
| STE2010*1W5-series | 2.600.20 x 5.100.20 x 0.650.20 mm | 2~400 | 1.5 | 0.5%(D) / 1%(F) | 50 / 100 |
| STE2512*2W0-series | 3.200.30 x 6.400.30 x 0.650.20 mm | 2~400 | 2.0 | 0.5%(D) / 1%(F) | 50 / 100 |
| STE3921*3W0-series | 5.100.30 x 11.100.30 x 0.650.20 mm | 2~100 | 3.0 | 0.5%(D) / 1%(F) | 50 / 100 |
| STE4527*4W0-series | 7.101.0 x 11.601.0 x 0.650.30 mm | 2~100 | 4.0 | 0.5%(D) / 1%(F) | 50 / 100 |
Product Dimensions (Example for STE0603)
| Part Number | W (mm) | L (mm) | T (mm) | A (mm) |
| STE0603MW50-series R005 | 0.900.20 | 1.700.20 | 0.650.20 | 0.500.20 |
| STE0603MW50-series R006*S~R009*S | 0.900.20 | 1.700.20 | 0.650.20 | 0.400.20 |
| STE0603MW50-series R010~R049 | 0.900.20 | 1.700.20 | 0.650.20 | 0.400.20 |
| STE0603*W50-series R050~R060 | 0.900.20 | 1.700.20 | 0.650.20 | 0.400.20 |
Product Structure & Material
Substrate: Alumina Ceramic
Adhesion layer: Epoxy
Resistive element: Copper alloy
Terminal electrode: Tin, Nickel, Copper
Protective coating: Flame-retardant epoxy, meets UL-94-V0 requirements (Green)
Marking coating: Flame-retardant epoxy, meets UL-94-V0 requirements (Black)
Reliability Test Standards
| Test Parameter | Conditions | Requirements |
| Short Time Over Load | P= 2.5Pr ; T=252C , t = 5sec. | (1.0%+0.5m) |
| High Temp. Exposure | T = +1702C ; t = 1000h | (1.0%+0.5m) |
| Low Temp. Storage | T = -552C ; t = 1000h | (1.0%+0.5m) |
| Moisture Load Life | (60, 95%RH) Vtest = Vmax ; T=602C ; RH=95% ; t= 90min ON , 30min OFF , 1000h | (2.0%+0.5m) |
| Thermal Shock | [-55C 30min. R.T. 3min. +155C 30min. R.T. 3min ], 100 Cycles | (1.0%+0.5m) |
| Load Life at 70C | Vtest = Vmax ; T=702C ;t= 90min ON , 30min OFF,1000h | (2%+0.5m) |
| Solderability | Dip into solder at T = 2455C , t = 30.5sec. | The covered area >95% |
| Resistance to Solder Heat | Through Reflow T= 2755C , t =201sec. | (1.0%+0.5m) |
| Mechanical Shock | a =100G , t =11ms, 5 times shock | (1.0%+0.5m) |
| Substrate Bending | Span: 90mm ; Bend Width: 2mm ; Test board: Glass-Epoxy Board ; Thickness =1.6mm | (1.0%+0.5m) |
Environmental Characteristics
Operating Temperature: -55155
Storage Conditions:
- Under airtight in temperature +1040, relative humidity 75% can store 2 years.
- Without dew in temperature +1060, relative humidity 95% maximum value for 30 days.
Recommended Solder Pad Dimensions (Example for STE0603)
| Part Number Series | P (mm) | W (mm) | D (mm) | Loading (W) |
| STE0603MW50-series R005 | 0.50 | 0.92 | 1.35 | 0.50 |
| STE0603MW50-series R006*S~R009*S | 0.60 | 0.92 | 1.30 | 0.50 |
| STE0603*W50-series R010~R60 | 0.60 | 0.92 | 1.30 | 0.50 |
Recommended Soldering Parameters
Wave Solder Temperature Curve
Preheating: 100~130, max. 100 sec.
Soldering: 250~265 max. 10 sec.
Maximum temperature: 2605, max. 10sec.
Solder Reflow Temperature Curve
Preheating: 145 15, max. 120 sec.
Soldering: min. 220, max. 60 sec.
Maximum temperature: 2605, max. 10sec.
2410121318_Walter-Elec-STE1206M1W0R025F_C201289.pdf
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High precision metal foil current sensing resistor Walter Elec STE1206M1W0R025F with flame retardant epoxy coating Images
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