Features
- Tolerance 1%, 5%, 10%, depending on construction
- Twelve wattage ratings
- Seven package sizes
- Two mounting designs to accommodate your soldering process
- Five power resistor technologies to optimize your operating performance:
1. Carbon and Ceramic composition for surge and low inductance
2. Metal film for high ohmic value and low T.C.
3. Wire element for inrush current combined with low ohmic values. Resistance values as low as 0.005Ω
4. Power film for high ohmic value and high wattage
5. High Voltage thick film for high voltage applications
- Flexible J-bend terminations
- Working Temperature Range: -55°C to +150°C
Specifications
*25°C ambient. E24 values standard; contact Ohmite for custom values.
Performance Data
All models
Leaching (260°C Solder immersion, 60 sec.) - No visible leaching
Thermal Shock (Units at -55°C, then rated power applied) - No mechanical damage
Flammability - UL Material rating, UL94V0
Derating
TCR
Recommended Solder Profile
Preheating: 145°C ±15°, max. 120 sec.
Soldering: min. 220°C, max. 60 sec.
Max. Temp.: 260°C ±5°, 10 sec.
(RC only: 250°C ±5°, 3 sec.)
The temperature rise graph data was obtained by a selection of test substrate size and trace width for each resistor size to limit operating temperatures to safe values.
The operating temperature safe rises are either 100°C substrate temperature rise or 180°C package hot spot temperature rise at 25°C ambient.
FR4: 0.062 in. thick; 0.062 in. traces
Alumina: 0.040 in. thick; 0.010 in. traces
Molding material rated at 205°C continuous
RC Series : Bake Procedure
RC SERIES ONLY
- A. Heat Treatment
110°C ±10°C 15 hours
- B. Frequency of heat treatment
1 time only
- C. Cautions
Solderability: may be affected due to oxidization of lead wire
Resistance value: some units may not completely recover to original value.
Soldering heat: some treated product may have substantial resistance change during soldering operation. It is recommended that parts be tested to evaluate soldering heat effects.
Dimensions
Note 1: Packages BA and CA are only available with a pedestal base. Packages CB and DA are available in either pedestal or recessed base. Packages DB and EA are only available in a recessed base.
Note 2: Test point is .020 above PCB.
Note 3: Tape and reel dimensions per EIA 481 A except “EA” size which is 12 mm component pitch versus 16mm pitch.
Reel Dimensions
All reels are compatible with major pick-and-place machines and made in accordance with EIA 481 A (except EA size, which is 12mm component pitch versus 16mm pitch).
