Surge Resistant MELF Resistor (0.25W 39.2ohm 1%)
SRM204F39R2TKZTR3K0
High pluse load and anti-surge resistor, anti-sulfur
Surge Resistant MELF Resistor 0.25W 39.2ohm 1%, is designed by thin film technology with surperior anti-surge capability, benefits from MELF packages it could be excellent in heat disspation, anti-sulfur. It's the best alternative to any other surge resistors.
| Size | Power Rating | Tolerance(%) | TCR(PPM) | Resistance(Ω) | Package |
|---|---|---|---|---|---|
| 0204 | 0.25W | 1% | -- | 39.2 | 3K/Tape Reel |
Features
- AEC-Q200 Compliant
- Anti-sulfuration test qualified
- Heat dissipation is much better than chip resistor
- Stronger mechanical structure to endure vibration and thermal shock
- MELF packaging yet capable of high power handling
- Special conductive film enhances anti-surge capability
- Absorbs harmful surge which damages precious devices or components
- SMD-enabled alternative to carbon composition resistors
- Approved to the safety requirement of EN IEC 62368-1:2018, Anhang/Annex G.10 (includes former requirement of EN IEC 60065(VDE 0860), 14.2a) except SRM204 type)
- Products meet RoHS requirements and do not contain substances of very high concern identified by European Chemicals Agency
Application
- Lightning protection
- Automotive
- Industrial Automation
- Measurement/Testing Equipment
- Power Supply
- Medical equipment
- Communication
- Smart home
Single Surge Performance
Pulse Protective Resistor - SRM is showing the surge performance from 10uS to 1S.
Surge Power Derating Curve
• SINGLE SURGE PERFORMANCE graph is good for NON REPETITIVE applications operating in an ambient temperature of 70°C or less.
For temperatures above 70°C, the graph power must be derated further linearly down to zero at 150 °C.
• To determine applicable surge power in continuous-surge applications:
1. Identify allowable duration and peak power Psurge of single surge.
2. Determine ratio of surge duration/surge OFF time in application.
3. Calculate Papplicable backwardly according to Y-axis of SURGE POWER DERATING CURVE.
Suggested Pad Layout
Suggested pad layout for Surge Resistant MELF Resistor, SRM series
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Metal Film MELF Resistor-MM
The Metal Film MELF Resistor (MM) is designed in a cylindrical shape and Metal Electrode Leadless Face. Its dimensions are the same as SMD chip resistors, with a rated power from 0.16W to 0.5W and resistance range from 0.51 ohm to 10M ohm. It has superior reliability and stability since the MELF package is better in heat dissipation than chip resistor, and it has a stronger mechanical structure to endure vibration and thermal shock.
Anti-Surge Wire Wound MELF Resistors-SWM
The Anti-Surge Wire Wound MELF Resistor (SWM) features a power rating from 1W to 4W, with resistances ranging from 1 ohm to 1.2K ohm, and tolerance of ±1%, ±2%, and ±5%. The SWM series is applied in high surge applications such as high rush current protection for power capacitors, motor start-up protection, Electric Vehicle, renewable energy storage, etc., to absorb harmful surge energy, thereby preventing the hazard of circuit damage caused by surge energy. Due to its SMD-enabled structure with MELF style, it is better in heat dissipation than chip resistor, and it has a stronger mechanical structure to endure vibration and thermal shock. The electrodes are enhanced to weld more reliably against surge.
Stabilized Film Power MELF Resistor-SFP
The Stabilized Film Power MELF Resistor (SFP series) is optimized for heat dissipation, featuring a low temperature coefficient and tolerances, and supports a power rating from 0.4W to 3W, with a resistance range from 0.5 ohm to 10M ohm. The resistance is most stabilized after long-term operation due to its superior metal film coating on the cylindrical ceramic rod. Its SMD-enabled structure with MELF style provides better heat dissipation than a chip resistor, along with a stronger mechanical structure to withstand vibration and thermal shock. The Firstohm SFP series serves as the best alternative to MMA0204/MMB0207.
Metal Film MELF Precision Resistor-MMP
The Metal Film MELF Precision Resistor (MMP) features a power rating from 0.16W to 1W, a resistance range from 10 ohm to 1M ohm, and with tight tolerance down to ±0.1%, making it the perfect choice for modern professional electronics where reliability and stability are major concerns. Its SMD enabled structure with MELF style is better in heat dissipation than chip resistor, and it has a stronger mechanical structure to endure vibration and thermal shock. The Metal Film MELF Precision Resistor is the most precision resistor in Firstohm's product catalog.
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Surge Resistant MELF Resistor
Surge Resistant MELF Resistor is the best alternative to any other surge resistors such as CMA0204,CMB0207.
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