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Low power resistors KFD

Low power resistors KFD
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Low power resistors KFD

Product catalog summary
Overview: This document provides technical specifications for wire wound resistors with axial wire terminals housed in ceramic tubes, manufactured by KRAH ELEKTRONISCHE BAUELEMENTE GMBH. It includes details on dimensions, resistance ranges, power ratings, and reliability.
Specifications:
  • Dimensions: Various models (KFD 0620, KFD 0625, KFD 0638, etc.) with lengths ranging from 20 mm to 75 mm.
  • Resistance Range: CuNi 10, CuNi 44/NiCr with resistance values from R051 to 82K.
  • Resistance Tolerances: K (±10%) for CuNi 10 / CuNi 44 / NiCr, J (±5%) for CuNi 44 / NiCr.
  • Power Rating: Ranges from 4 W to 17 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 Voltage: Ranges from 150 V to 500 V.
  • Dielectric Withstanding Voltage: ≥ 2000 Veff.
Performance and Reliability:
  • Dissipation at Various Temperatures: Detailed power dissipation values at ambient temperatures of 25°C and 70°C.
  • Reliability: Standard rating for complete failure is ≤100 x 10-9/h at 70°C ambient temperature, 25% relative humidity, and 255°C surface temperature.
  • Resistance Change Over Time: Resistance drift at 255°C is specified for 1,000 h, 10,000 h, and 100,000 h.
Testing and Standards:
  • Climatic Category: IEC 68 55 / 250 / 10.
  • Solderability Test: ≤ 1% + 0.1 Ω at 260°C for 10 seconds.
  • Temperature Cycling Test: ≤ 2% + 0.1 Ω between -55°C and +200°C.
  • Damp Heat Test: ≤ 3% + 0.1 Ω over 21 days at 40°C and 95% relative humidity.
Additional Notes:
  • The solderability of leads in ceramic casings is limited within a range of 5 mm.
  • Order designation example provided for bulk orders.
See more

Catalog excerpts

Low power resistors KFD-1

Drahtwiderstände Cement- Wire wound resistors / Résistances bobinées Axialer Drahtanschluss - Keramikgehäuse Axial wire terminal – Ceramic tube Sorties fils axiaux – Tube céramique 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 Pn Belastbarkeit bei Dissipation at ϑu = 25° C Puissance à KFD 0620 G (KFD 0618 G) KFD 0625 G KFD 0620 P… KFD 0625 P… (KFD 0618 P…) 20 ±1 mm 25 ±1 mm (18 ±1 mm) 8 mm oder / or / ou 15 mm 25 mm 30 mm 94 ±2 mm 101 ±2 mm max. 109 mm max. 116 mm Glasfaserkordel Fiber glass core Fibre de verre R051 – R11 R12 – 9K1 K (±10%) CuNi 10 / CuNi 44 / NiCr J (±5%) CuNi 44 / NiCr 4W ϑo = 150° C ϑo = 200° C ϑo = 255° C ϑo = 200° C ϑo = 250° C ϑo = 300° C Belastbarkeit bei 1,9 W 2,5 W 3,5 W 2,9 W 3,7 W 5,0 W Dissipation at ϑu = 70° C 4,0 W 5,0 W 7,0 W Puissance à Durchschlagfestigkeit ≥ 2000 Veff Dielectric withstanding voltage Rigidité diélectrique Grenzspannung U 150 V 200 V 250 V Limiting voltage U Tension limite nominale U Temperaturkoeffizient CuNi 10: +350…..+450 x 10-6/K Temperature coefficient CuNi 44 / NiCr: -80……+200 x 10-6/K Coefficient de température Zul. Oberflächentemperatur CuNi 10: 200 ° C Lim. surface temperature CuNi 44 / NiCr: 300 ° C Lim.température surface Klartext, Wertkennzeichnung DIN/IEC 62 Kennzeichnung Cipher stamped, the marking of values according to DIN/IEC 62 Marking En clair, du marquage de la valeur DIN/IEC 62 Marquage Anmerkung : ϑu=Umgebungstemperatur ϑo=Oberflächentemperatur G: Trommel, Gurtrolle, Verpackungseinheit 1200 Stück Notes: Ambient temperature Surface temperature Drum, beltroll, packing unit 1200 pcs. Nota: Température ambiante Température surface Le tambour, la bande en rouleau, unité d’emballage de 1200 pièces * Bei Widerständen im Keramikgehäuse ist die Lötbarkeit der Anschlussdrähte in einem Bereich von 5 mm eingeschränkt. *The solderability of leads of resistors mounted in ceramic casings is limited within a range of 5 mm. * La soudabilité des fils de connexion des résistances montées dans un boîtier céramique est limitée dans une gamme de 5 mm. Bestellbeispiel/ Order designation/ Code de commande: 1000 Stück KFD 0625 G 100R K KRAH ELEKTRONISCHE BAUELEMENTE GMBH, Märkische Straße 4, 57489 Drolshagen, Telefon: 02761/701-0, Telefax: 02761/701-177 Seite 1 von 4 Lfd.-Nr.: 403, Stand 08 / 2010

 Open the catalog to page 1
Low power resistors KFD-2

Drahtwiderstände Cement- Wire wound resistors / Résistances bobinées Axialer Drahtanschluss - Keramikgehäuse Axial wire terminal – Ceramic tube Sorties fils axiaux – Tube céramique 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 von...

 Open the catalog to page 2
Low power resistors KFD-3

Drahtwiderstände Cement- Wire wound resistors / Résistances bobinées Axialer Drahtanschluss - Keramikgehäuse Axial wire terminal – Ceramic tube Sorties fils axiauxl – Tube céramique 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 Pn Belastbarkeit bei Dissipation at ϑu = 25° C Puissance à Belastbarkeit bei Dissipation at ϑu = 70° C Puissance à Durchschlagfestigkeit Dielectric withstanding...

 Open the catalog to page 3
Low power resistors KFD-4

Drahtwiderstände Cement- Wire wound resistors / Résistances bobinées Axialer Drahtanschluss - Keramikgehäuse Axial wire terminal – Ceramic tube Sorties fils axiauxl – Tube céramique 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 von...

 Open the catalog to page 4

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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.