WIRE WOUND RESISTORS SILICONE COATED TYPE TM HTA SERIES Flame Retardant Thermocoat Fully Welded Construction HIGH SURFACE TEMPERATURE Power Silicone "Thermo Coat" Wire Wound Resistors Industrial / Professional Applications Alloy Resistance Wire wound To Specific Parameters On High Thermal Conductivity Ceramic Core Axial Termination Flame retardant coating compatible with UL standards 0.75 W to 12 Watts Tolerances as close as 1% TCR as low as + 20ppm / C [on request] Pulse types available as per-IEC - 61000 - 4 - 5. APPLICABLE STANDARDS JSS- 50402 [Pattern RFHT - 1], IS - 8909 [Type FRP3] IEC-Pub 266 and Pub 266 A [Type - 2E] NON INDUCTIVE RESISTORS Low inductance Aryton - Perry winding type resistors are available in this series. For non-inductive types reduce maximum resistance values shown to 50% and the continuous working voltage to 70% (Please refer to note (1) of ordering information for placing orders). PHYSICAL CONFIGURATION L I d I D PULSE TYPE RESISTORS LM HTR TYPE H-1B H-2B H-6 H-9 H-12 POWER DIMENSIONS (mm) RESISTANCE TYPICAL RATING RANGE WT. d at 70C max PER PC D +0.08 I LM min L (Ambient) (max) (max) -0.05 +1.5 +1 (gms) 0.75W 2.5W 6W 9W 12W 9.0 13.0 23.0 39.0 53.0 3.5 5.5 8.0 8.0 8.0 0.8 0.8 0.8 0.8 0.8 38 38 38 38 38 30 35 45 60 75 R05 2K2 R05 10K R05 33K R05 68K R05 100K 0.6 1.1 3.2 5.4 6.3 For resistance values less than R10 and tolerance less than +2% please measure resistance over centered length LM Resistors for use under Pulse conditions as per IEC - 61000 - 4 - 5 available. For further information please refer to "Understanding pulse & over load capability of wire wound resistors". In case a tailor-made pulse resistor is required, please refer to "Questionnaire of data required" and provide data accordingly. PRE-FORMED LEADS The resistor terminations can be bent and cut as per requirements for quick PCB mounting. Please send detailed drawings of the type of preforming required. Depending on application the resistor leads may be tin plated Copper Weld(R) instead of tin plated copper. HTA WIRE WOUND RESISTORS SILICONE COATED TYPE TM TAPING Types H-1B, H-2B, & H-6 can be supplied in taped form. Please refer tape/ammo pack specifications on page no. 81. Tape/Reel on request. ELECTRICAL DATA / CHARACTERISTICS Voltage Rating The resistors shall have a rated DC, continuous working voltage or an approximate sine-wave root mean square (rms) working voltage at commercial line frequency corresponding to the power rating, as determined by the following formula E= PR where, E= rated DC or rms continuous working voltage. P= Power rating in watts. R= Nominal resistance in ohms. Voltage Proof - Dielectric Withstanding Voltage [applicable to insulated styles only] No breakdown or flashover [Test No. 13.3.1 of JSS - 50400] Insulation Resistance 1000 M [Dry] [Test No. 13.4 of JSS - 50402 and JSS - 50400] Rated Ambient Temperature - 70C Full power dissipation at upto 70C and linearly derated down to zero dissipation at 350C. [See derating curve below] DERATING CURVE Rated Dissipation [%] Resistance Tolerances Available + 10% [K], + 5% [J], + 3% [H] + 2% [G], +1% [F] [Test method no. 13.2 of JSS - 50402 and 50400] 100 60 20 0 25 70 100 150 200 250 300 350 Ambient Temperature [C] Short-time Overload Max. R + (2% + R05) [Test No.13.19 of JSS - 50402 and JSS - 50400] ENVIRONMENTAL SPECIFICATIONS Temperature Cycling Max. R + (2% + R05) [Test No.13.14 of JSS - 50402 and JSS 50400] Life (Electrical) Max. R + (<5% + R05). [Test No.13.17 of JSS - 50402 and JSS - 50400] Climatic and Damp Heat Max. R + (<5%). No physical damage. [Test No.13.15 and 13.16 of JSS - 50402 and JSS -50400] [Severity H - 13] Flammability Within the specified limits. [Test No. 10 of JSS - 50101] Temperature Characteristic of Resistance +100 to 200 ppm / C, can be significantly lowered on request. [Test No. 13.24 of JSS - 50402 and JSS - 50400] MECHANICAL SPECIFICATIONS Pull Test No mechanical damage [Force applied from 2 to 4.5 Kgs depending on size] Solderability Continuous and satisfactory [Test method No. 19 of JSS 50101] TYPICAL APPLICATIONS HTA series is unique due to its special flame proof "Thermocoat" which resists hot spot temperature of 350C and uses specially selected resistance elements and substrates. These unique features can be effectively used by the circuit designer in all industrial, electrical, electronic and telecommunication equipment where large power dissipation : size ratio are required and where the ambient operating temperature is elevated without sacrificing accuracy and reliability. HTA series when wound by Aryton-Perry method can be used effectively for high frequency applications, if required. ORDERING INFORMATION HTA H-6 50R J TOLERANCE RESISTANCE VALUE HTR TYPE SERIES Note : (1) In case non-inductive type is required, please prefix HTR type with 'N' eg : NH-6. (2) In case pulse type is required please suffix HTR type with `I' for e.g. H2BI. (3) When thermal efficient cores are used the type shall be suffixed with alphabet `A'. The words - "Applicable standards" do not necessarily signify certification to that standard, however the tests mentioned are carried out on the broad based guidelines set out in these standards. HTA WIRE WOUND RESISTORS SILICONE COATED TYPE TM