Gallery View: DIP-based selection of current-sensing resistors

Resistance ranges from 0.5mohm to 1ohm, while tolerance is ±1, ±2 or ±5 percent.

Current-sensing resistors from mainland China companies are mostly lead units, and more than 80 percent are DIP kinds. Shenzhen Pak Heng Electronics Co. Ltd, Shenzhen Jingdacheng Electronics Co. Ltd and Chian Chia Electronic (Shenzhen) Co. Ltd's yield consists of through-hole-mounted types.

Releases have 0.5mohm to 1ohm resistance and ±0.5, ±1, ±2, ±5 or ±10 percent tolerance. Versions with ±1, ±2 and ±5 percent are common. In terms of TCR, the typical choices are 20, 50 and 100ppm/C.

Only a few suppliers, including Sichuan Yongxing, have models in chip configuration. The local range includes metal alloy, and thick- and thin-film units, with the first widely available. By size, the usual options are 0402, 0603, 0805, 1206, 2010 and 2512.

Foreign-invested makers of SMD kinds will continue to lead in this field in coming years.

Copper alloy, including Manganin and NiCr, is the main material used in the production of lead-type current-sensing resistors. In chip varieties, the key inputs are substrates, resistive layers and terminations.

Copper alloy comes from Taiwan, and the rest from the domestic supply. Despite rising labor cost, suppliers will keep prices stable to attract more orders.

Here is a selection of current-sensing resistors from mainland China:

Current-sensing resistor for power supplies

Chian Chia Electronic (Shenzhen) Co. Ltd's Milliohm Resistor model for power supplies has 3 to 220mohm resistance, ±5 or ±10 percent tolerance and ±100ppm/C TCR. The current-sensing component operates in -40 to 200 C. The minimum quantity is 5,000 units, and delivery lead time is 14 days. Custom orders are accepted.

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Radial-lead current-sensing resistor meets RoHS

Shenzhen Jingdacheng Electronics Co. Ltd offers model OAR radial-lead current-sensing resistor with 5 to 50mohm resistance, and ±1, ±2 or ±5 percent standard tolerance.

The open-air unit has a resistive element made of precision alloys, and copper leads for 60/40 solder. It meets RoHS. The minimum order is 5,000 units, and delivery is within 10 days.

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Current-sensing resistor has 5 to 100mohm

The model HMR current-sensing resistor from Shenzhen Pak Heng Electronics Co. Ltd has 5 to 100mohm resistance or as low as 0.005R, and ±1, ±5 or ±10 percent tolerance. The operating ambient temperature is -55 to 125 C.

The maker requires a minimum order of 10,000 units for delivery within 10 days. Customization is accepted.

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Noninductive current-sensing resistor

Sichuan Yongxing Electronics Co. Ltd's model RX929 noninductive current-sensing resistor boasts 3 to 15mohm or 5 to 10mohm resistance, and ±1, ±5 or ±10 percent tolerance. It has ≥±40ppm/C TCR. The unit comes in 2, 3, 5 and 10W versions. A minimum order of 1,000 units is required. Delivery takes 21 days.

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