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Low power resistors SFR

Low power resistors SFR
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Low power resistors SFR

Product catalog summary
Overview: This document provides technical specifications for wire wound resistors with radial leads and silicon cemented coating, manufactured by KRAH ELEKTRONISCHE BAUELEMENTE GMBH. It includes details on dimensions, resistance ranges, power ratings, temperature coefficients, and reliability.
Specifications:
  • Models: SFR 0518 P, SFR 0523 P, SFR 0533 P, SFR 0543 P, SFR 0553 P with lengths ranging from 19.0 mm to 54.0 mm.
  • Resistance Range: Varies by model, with ranges from R10 to 27K ohms.
  • Resistance Tolerances: K (±10%) for CuNi 10, CuNi 44, NiCr; J (±5%) for CuNi 44, NiCr.
  • Power Rating: At 70°C, ranges from 2.5 W to 8 W depending on the model.
  • Temperature Coefficient: CuNi 10: +350 to +450 x 10-6/K; CuNi 44/NiCr: -80 to +200 x 10-6/K.
  • Limiting Surface Temperature: Normal operation up to 330°C, short-term overload up to 350°C.
Testing and Reliability:
  • Nominal Resistances: Series E 12 (10%), Series E 24 (5%).
  • Climatic Category: IEC 68 55/250/10.
  • Solderability: ≤ 1% + 0.1 Ω at 260°C for 10 seconds.
  • Temperature Cycling: ≤ 2% + 0.1 Ω from -55°C to +200°C.
  • Damp Heat Test: ≤ 3% + 0.1 Ω over 21 days at 40°C and 95% relative humidity.
  • Resistance Change: At 255°C, changes range from -1.0% to +8.0% over 100,000 hours.
  • Reliability: Failure rate ≤100 x 10-9/h at 70°C ambient temperature, 25% relative humidity, and 250°C surface temperature.
Graphical Data: The document includes curves showing temperature increase as a function of load for PCB-mounted resistors, measured at specific points.
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Catalog excerpts

Low power resistors SFR-1

Drahtwiderstände Cement- Wire wound resistors / Résistances bobinées Radialer Anschluss - Silikonzementumhüllung Radial lead – Silicon cemented Raccordement radial – Silicone cimentées Bauform Style Modèle Abmessungen Dimensions Dimensions Trägerkörper Carrier Support Widerstandswertbereich Resistance range Plage de valeurs Widerstandswert-Toleranzen Resistance tolerances Tolérances sur la résistance Nennlast Pn Power rating Pn Puissance nominale Belastbarkeit bei Dissipation at ϑu = 25° C Puissance à Belastbarkeit bei Dissipation at ϑu = 70° C Puissance à Grenzspannung U Limiting voltage U Tension limite nominale U Temperaturkoeffizient Temperature coefficient Coefficient de température Zul. Oberflächentemperatur Lim. surface temperature Lim.température surface Kennzeichnung Marking Marquage Anmerkung : Notes: Nota: 24,0 mm 34,0 mm 44,0 mm 5 mm oder / or / ou 15 mm 15,2 mm 25,4 mm 35,5 mm Glasfaserkordel Fiber glass core Fibre de ferre R13 – R30 R33 – 9K1 K (± 10%) CuNi 10 / CuNi 44 / NiCr J (± 5%) CuNi 44 / NiCr ϑu = 70° C U = √ Pn x R CuNi 10: CuNi 44 / NiCr: Dauerbelastung: 330 ° C Ku rzzeitige Überlast: 350 ° C Normal operation: Short time overload: Fontionnement: (CuNi 10: 200 ° C) Surcharg e: (CuNi 10: 250 ° C) Klartext, Wertkennzeichnung DIN/IEC 62 Cipher stamped, the marking of values according to DIN/IEC 62 En clair, du marquage de la valeur DIN/IEC 62 Umgebungstemperatur Ambient temperature Température ambiante ϑo = Oberflächentemperatur Surface temperature Température surface Bestellbeispiel: Order designation: 1000 Stück SFR 0553 P15 100R J Code de commande: KRAH ELEKTRONISCHE BAUELEMENTE GMBH, Märkische Straße 4, 57489 Drolshagen, Telefon: 02761/701-0, Telefax: 02761/701-177 Seite 1 von 2 Lfd.-Nr.: 401, Stand 09 / 2009

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Low power resistors SFR-2

Drahtwiderstände Cement- Wire wound resistors / Résistances bobinées Radialer Anschluss - Silikonzementumhüllung Radial lead – Silicon cemented Raccordement radial – Silicone cimentées Nennwiderstandswerte Prüfklasse nach IEC 68 Prüfung Lötung (Lotbad 260° Dauer 10s) C, Prüfung Temperaturwechsel (-55° / +200° C C) Prüfung Feuchte Wärme (21 Tage 40° / 95% r.F.) C Driftverhalten ϑo = 255° C Die angegebenen Werte gelten für 99,7% aller Widerstände. Bei niederohmigen Widerständen können die angegebenen Änderungen um 0,1 überschritten werden. Zuverlässigkeit: Richtwert bei einer Umgebungstemperatur...

 Open the catalog to page 2

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*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.