CSS1206 ETC2

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Rev Date: 06/04/2012 1 www.seielect.com This specification may be changed at any time without prior notice marketing@seielect.com Please confirm technical specifications before you order and/or use. CSS/CSSH Series Ultra Precision Current Sensing Chip Resistor Stackpole Electronics, Inc. Resistive Product Solutions Features: • High power metal alloy current sense resistor

  • Very low inductance (0.5nH to 5nH)
  • High temperature performance up to 225 °C; for operation up to 275ºC, contact factory
  • Excellent frequency response
  • Low thermal EMF (<1µV/C)
  • Proprietary processing technique produces extremely low resistance values
  • RoHS compliant / lead-free ±50 ppm/ºC - 0.001 - 0.004 ±25 ppm/ºC 0.007 - 0.015 0.005 - 0.015 ±15 ppm/ºC 0.016 - 0.05 0.016 - 0.05 ±50 ppm/ºC - 0.001 - 0.003 ±25 ppm/ºC - 0.004 - 0.006 ±15 ppm/ºC 0.007 - 0.1 0.007 - 0.1 ±50 ppm/ºC - 0.0005 - 0.003 ±25 ppm/ºC - 0.004 - 0.006 ±15 ppm/ºC 0.007 - 0.075 0.007 - 0.075 ±50 ppm/ºC - 0.0005 - 0.0025 ±25 ppm/ºC 0.007 - 0.01 0.003 - 0.01 CSS2725 4 126.49 252.95 ±50 ppm/ºC - 0.00025 - 0.003 ±25 ppm/ºC 0.004 - 0.007 0.004 - 0.007 ±15 ppm/ºC 0.008 - 0.1 0.008 - 0.1 ±25 ppm/ºC 0.004 - 0.007 0.004 - 0.007 ±15 ppm/ºC 0.008 - 0.05 0.008 - 0.05 CSS4527 5 100 173 ±50 ppm/ºC 0.007 - 0.12 0.0005 - 0.12 1 31.62 63.25 Ohmic Range (Ω) and Tolerance 1%, 2%, 5%0.5% Type/Code Maximum Power Rating (Watts) Maximum Rating Current (A) Maximum Overload Current (A) TCR (ppm/ºC) 31.62 63.25 3 27.39 47.43 CSSH2728 4 CSS2728 CSS1206 CSS2512 CSSH2512 141.42 77.46 134.16 63.25 63.2531.62CSS2010 Electrical Specifications Please refer to the High Power Resistor Application Note (page 6) for more information on designing and implementing high power resistor types.

Rev Date: 06/04/2012 2 www.seielect.com This specification may be changed at any time without prior notice marketing@seielect.com Please confirm technical specifications before you order and/or use. CSS/CSSH Series Ultra Precision Current Sensing Chip Resistor Stackpole Electronics, Inc. Resistive Product Solutions 0.0005 - 0.005 CSS4527 5 0.0051 - 0.1 0.0025 0.003 0.0041 - 0.075 0.0005 0.003 - 0.004 0.0031 - 0.1 H CSSH2512 0.004 - 0.1 0.00025, 0.0005 0.001 0.0015 0.002 0.0005 - 0.004 Unit CSS1206 Type/Code Maximum Power Rating (Watts) Resistance Range (Ω) bLW a CSSH2728 4 0.004 - 0.1 0.001 - 0.05 CSS2010 CSS2728 CSS2725 CSS2512 0.001 - 0.003 Mechanical Specifications

Rev Date: 06/04/2012 3 www.seielect.com This specification may be changed at any time without prior notice marketing@seielect.com Please confirm technical specifications before you order and/or use. CSS/CSSH Series Ultra Precision Current Sensing Chip Resistor Stackpole Electronics, Inc. Resistive Product Solutions 0.063 0.086 0.039 inches 1.60 2.18 1.00 mm 0.114 0.115 0.048 inches 2.89 2.92 1.22 mm 0.090 0.115 0.095 inches 2.29 2.92 2.41 mm 0.120 0.145 0.050 inches 3.05 3.68 1.27 mm 0.083 0.145 0.125 inches 2.11 3.68 3.18 mm 0.120 0.145 0.050 inches 3.05 3.68 1.27 mm 0.110 0.145 0.071 inches 2.79 3.68 1.80 mm 0.125 0.270 0.052 inches 3.18 6.86 1.32 mm 0.108 0.308 0.138 inches 2.75 7.82 3.51 mm 0.108 0.308 0.138 inches 2.75 7.82 3.51 mm 0.189 0.344 0.217 inches 4.80 8.74 5.51 mm 0.134 0.344 0.327 inches 3.40 8.74 8.31 mm CSS4527 5 0.0005 - 0.005 0.0051 - 0.12 CSS2728 3 0.004 - 0.1 CSSH2728 4 0.004 - 0.1 0.00025 - 0.003CSS2725 4 CSSH2512 3 0.0005 0.003 - 0.004 CSS2512 2 0.0005 - 0.004 0.0041 - 0.075 CSS1206 1 0.001 - 0.05 CSS2010 1 0.001 - 0.003 0.0031 - 0.1 Type/Code Maximum Power Rating (Watts) Resistance Range (Ω)a b i U n i t Solder Pad Dimensions

Rev Date: 06/04/2012 4 www.seielect.com This specification may be changed at any time without prior notice marketing@seielect.com Please confirm technical specifications before you order and/or use. CSS/CSSH Series Ultra Precision Current Sensing Chip Resistor Stackpole Electronics, Inc. Resistive Product Solutions Power Derating Curve: Ambient Temperature (ºC) 100 150 200 25050 300 100 Percent Rated Power (%) 225ºC Test Item Condition of Test Test Method Test Limits R1: resistance of room temperature (T1) R2: resistance of 150ºC (T2) The number of rated power are as follows: 1. CSS1206-1W: 4 times rated power 2. CSS2010-1W: 4 times rated power 3. CSS2512-2W: 5 times rated power 4. CSSH2512-3W: 3 times rated power 5. CSS2725-4W: 4 times rated power 6. CSS2728-3W: 3 times rated power 7. CSSH2728-4W: 4 times rated power 8. CSS4527-5W: 3 times rated power (∆R/R1) ≤ ±2% Insulation Resistance 100±15V DC for 1 minute JIS C 5201-1 4.6 ≥10 JIS C 5201-1 4.13 Operating Temperature Range: -55°C to +225°C. Contact factory for operation at higher temperatures. Applied 500V AC for 1 minute and limit surge current 50mA (max)Dielectric Withstanding Voltage JIS C 5201-1 4.7 Without break down (∆R/R1) ≤ ±0.5%Short Time Overload (rating power duration = 5 seconds) TCR (ppm/ºC) Per specification (refer to Electrical Specification table) JIS C 5201-1 4.8Temperature Coefficient of Resistance (TCR) (R2-R1) R1 (T2-T1) X 106= Performance Characteristics

Rev Date: 06/04/2012 5 www.seielect.com This specification may be changed at any time without prior notice marketing@seielect.com Please confirm technical specifications before you order and/or use. CSS/CSSH Series Ultra Precision Current Sensing Chip Resistor Stackpole Electronics, Inc. Resistive Product Solutions How to Order 123456789 1 0 1 1 1 2 1 3 CSS2 7 2 5FT3L0 0 Size CSS 1206 Code Tol Code Quantity CSSH 2010 D 0.5% 4,000

2512 F 1%

(H)2512 G 2%

2725 J 5%

(H)2728 500 4527 Metal Alloy High Power (H)2728 1206 T 7" Reel - Plastic Tape 0.0009 ohm = L900 45274W 0.00025 ohm = L250 2,000 1,000 2010, 25122W (H)25123W 2725, 2728 Packaging 0.003 ohm = 3L00 Power Tolerance Description Size Resistance ValueProduct Series Four characters with "L" used as multiplier of 10-3 for any value under 0.1 ohm. Legacy Part Number (before January 3, 2011): Nominal Resistance Tolerance 0.003 1% Type Description Code Wattage Size Tolerance CSS Metal Alloy 1206 1W 1206 0.5% Standard Code CSSH High Power 2010 1W 2010 1% CSS1206 4,000 2512 2W 2512 2% CSS2010 (H) 2512 3W 2512 5% CSS2512 2725 4W 2725 CSSH2512 2728 3W 2728 CSS2725 (H) 2728 4W 2728 CSS2728 4527 5W 4527 CSSH2728 CSS4527 500 SEI Type Code Packaging R 7" reel plastic tape 1,000 CSS 2725 R SEI Types DescriptionQuantity 2,000

Rev Date: 06/04/2012 6 www.seielect.com This specification may be changed at any time without prior notice marketing@seielect.com Please confirm technical specifications before you order and/or use. CSS/CSSH Series Ultra Precision Current Sensing Chip Resistor Stackpole Electronics, Inc. Resistive Product Solutions High Power Chip Resistors and Thermal Management Stackpole has developed several surface mount resistor series in addition to our current sense resistors, which have had higher power ratings than standard resistor chips. This has caused some uncertainty and even confusion by users as to how to reliably use these resistors at the higher power ratings in their designs. The data sheets for the RHC, RMCP, RNCP, CSR, CSRN, CSRF, CSS, and CSSH state that the rated power assumes an ambient temperature of no more than 100 degrees C for the CSS / CSSH series and 70 degrees C for all other high power resistor series. In addition, IPC and UL best practices dictate that the combined temperature on any resistor due to power dissipated and ambient air shall be no more than 105C. At first glance this wouldn’t seem too difficult, however the graph below shows typical heat rise for the CSR ½ 100 milliohm at full rated power. The heat rise for the RMCP and RNCP would be similar. The RHC with its unique materials, design, and processes would have less heat rise and therefore would be easier to implement for any given customer. The 102 degrees C heat rise shown here would indicate there will be additional thermal reduction techniques needed to keep this part under 105C total hot spot temperature if this part is to be used at 0.75 watts of power. However, this same part at the usual power rating for this size would have a heat rise of around 72 degrees C. This additional heat rise may be dealt with using wider conductor traces, larger solder pads and land patterns under the solder mask, heavier copper in the conductors, vias through PCB, air movement, and heat sinks, among many other techniques. Because of the variety of methods customers can use to lower the effective heat rise of the circuit, resistor manufactu rers simply specify power ratings with the limitations on ambient air temperature and total hot spot temperat ures and leave the details of how to best accomplish this to the design engineers. Design guidelines for products in various market segments can vary widely so it would be unnecessarily constraining for a resistor manufacturer to recommend the use of any of these methods over another. Note: The final resistance value can be affected by the boar d layout and assembly process, especially the size of the mounting pads and the amount of solder used. This is especially notable for resistance values ≤ 50 m Ω. This should be taken into account when designing.