Wide Terminal Low Ohmic Chip Resistors for Current Detection
in Automotive and Power Supply Applications
ROHM has recently expanded its lineup of high power wide terminal low ohmic chip resistors designed for current detection in automotive systems, motors, power supply applications, and more. The latest addition, the LTR18 series, offers 1W of rated power in the 3216 size (3.2x1.6mm, t=0.58mm) - 4 times greater than conventional products.
Typically, resistors used for current detection in automotive, power supply, and motor circuits require low resistance, low TCR (Temperature Coefficient of Resistance), and high rated power. What's more, the growing interest in electronic products with ever increasing functionality will require even higher currents, heightening demand for products that support higher power in a compact form factor, particularly 1W in the 3216 size.
In response, an original heat dissipation design was used to provide 4x the power rating vs. conventional products in the 3216 size, along with improved materials and a revamped resistor element structure for superior TCR characteristics even at low resistances. And the novel wide terminal configuration minimizes mechanical stress at the joints and improves joint reliability against temperature fluctuations. In addition, higher power handling capability and improved temperature characteristics make them ideal for sets with stringent temperature compensation requirements, such as automotive applications, while reducing design load significantly.
Key Features1. 4x higher power rating than conventional products
Original heat dissipation design provides a rated power of 1W in the 3216 size – 4 times larger than the nearest competitor.2. Excellent temperature coefficient of resistance (TCR)
Normally, the lower the resistance value the higher the TCR. However, through material and resistive element optimization ROHM was able to provide the industry's best TCR at low resistances.
3. Wide terminal design utilized for greater reliability
Configuring the terminals at the wider sides reduces mechanical stress at the joints while improving junction reliability against thermal cycling. The result is unmatched reliability.
|Wide Terminal LTR Series||General-Purpose MCR Series|
| Distance Between |
| Effects Due |
To PCB Expansion/
| Mechanical stress at junction: |
| Mechanical stress at junction |
• TCR (Temperature Coefficient of Resistance) The lower the TCR value the lower the fluctuation in resistance due to changes in ambient temperature, ensuring stable operation.