Chip Weld Precision Resistors (LRN)

Chip Weld Precision Resistors (LRN)

For the development of current detection and shunting applications, DeMint's high current shunt (LRN) adopts the welding structure of Manganin and KAMAR (NiCr20AlSi) precision resistance alloys. The spacing standard design makes it easy for surface mounting, reflow soldering, and suitable for current sensing and shunting applications.

Open bare alloy element design allows air flow to achieve maximum cooling effect, so that PCB retains less heat. The design of flame protection structure provides 0.0005Ω low resistance and low inductance. These factors make ruggedness (LRN) an excellent choice for all high current power supply and power applications that are not affected by most environmental stresses.

Specially designed for applications requiring high power processing (LRN). The power is 4W and 7W. The ultra-low resistance ranges from 0.5mΩ to 30mΩ. There are various tolerance selection advantages (±1%, ±2%, ±5%) , size 4312, and 4320. To achieve compact size and miniaturization, design a smaller, lower cost, higher performance, high power circuit terminal product design.

Provide packing with Embossed Plastic Tape, size 4312 2Kpcs per reel, 4320 2Kpcs per reel, products meet the lead-free and RoHS standards. Customers can specify resistance, size and specifications to meet the design challenges and specific technical requirements. Please contact DeMint Business Department for the latest product information.

Download PDF Specification : Chip Weld Precision Resistors (LRN).

Features :
  1. Air cooling, Strong stability of circuit.
  2. Tolerance ±1%, ±2%, and ±5%. Rated Power 4W and 7W.
  3. Reflow Soldering appliable. lead-free and RoHS compliant.
  4. TCR down to ±20ppm/°C and ±50ppm/°C. Resistance down to 0.0005Ω.
Applications :
  1. Communication system.
  2. Power modules、Frequency converters.
  3. Current sensor for power hybrid applications.
  4. High current applications for the automotive market.
Chip Weld Shunts LRN - Dimension Specifications (Unit:mm)
Chip Weld Shunts LRN - Dimensions (Unit:mm)
Chip Weld Shunts LRN - Dimensions (Unit:mm)
Type Power (W) Material Size Resistance (mΩ) D
(mm)
H
(mm)
B
(mm)
W
(mm)
T
(mm)
A
(mm)
LRN 4 M 4312 2 0.59±0.05 3.1±0.3 4.2±0.5 11±0.5 2.8±0.3 3.1±0.3
3 0.39±0.05 3.1±0.3 4.2±0.5 11±0.5 2.8±0.3 3.1±0.3
5 0.40±0.05 3.1±0.3 4.2±0.5 11±0.5 2.8±0.3 3.1±0.3
K 4312 10 0.62±0.05 3.1±0.3 4.2±0.5 11±0.5 2.8±0.3 3.1±0.3
20 0.62± 0.05 3.1± 0.3 4.2±0.5 11±0.5 2.8±0.3 3.1±0.3
30 0.25± 0.05 3.1± 0.3 4.2±0.5 11±0.5 2.8±0.3 3.1±0.3
7 M 4320 0.5 0.74±0.05 3.1±0.3 4.2±0.5 11±0.5 2.8±0.3 6.1±0.4
1 0.37±0.05 3.1±0.3 4.2±0.5 11±0.5 2.8±0.3 6.1±0.4
5 0.20±0.05 3.1±0.3 4.2±0.5 11±0.5 2.8±0.3 6.1±0.4
K 4320 5 0.62±0.05 3.1±0.3 4.2±0.5 11±0.5 2.8±0.3 6.1±0.4
10 0.30±0.05 3.1±0.3 4.2±0.5 11±0.5 2.8±0.3 6.1±0.4
15 0.20±0.05 3.1±0.3 4.2±0.5 11±0.5 2.8±0.3 6.1±0.4
Chip Weld Resistors LRN - Surface Temperature Curve
Surface Temperature Curve (LRN)
Surface Temperature Curve (LRN)

SMD Weld Resistors LRN - TCR Derating Curve
TCR Derating Curve (LRN)
TCR Derating Curve (LRN)
SMD Weld Resistor LRN - Environmental Characteristics
Iterms Requirement Test Methods
Temperature Cycling ±0.5% JESD22
1000 Cycles (-55°C to +125°C). Measurement at 24±2 hours after test conclusion.
High Temperature Exposure ±0.5% MIL-STD-202
1000hrs.@T=125°C. Unpowered. Measurement at 24±2 hours after test conclusion.
Moisture Resistance ±0.5% MIL-STD-202
t=24 hrs/cycle.
Note:Steps 7a & 7b not required.Unpowered. Measurement at 24±2 hours after test conclusion.
Biased Humidity ±0.5% MIL-STD-202
1000hrs 85°C/85% RH.
Note: Specified conditions:10% of operating power.
Measurement at 24±2 hours after test conclusion.
Operational Life ±0.5% MIL-STD-202
Condition D Steady State TA=125°C at rated power. Measurement at 24±2 hours after test conclusion.
Solderability 95% Coverage Minimum. J-STD-002C
245°C±5°C, 5s+0.5s/-0.
Resistance to Soldering Heat ±0.5% MIL-STD-202
260°C±5°C, 10s±1s. Measurement at 24±2 hours after test conclusion.
Short Time Overload ±0.5% MIL-STD-202
5 × Rated power for 5s. Measurement at 24±2 hours after test conclusion.
Thermal Shock ±1% MIL-STD-202
-55°C/+125°C, 300 Cycles.Maximumtransfer time 20s, Dwell time 15min.
Vibration ±0.5% MIL-STD-202
5g's for 20 min, 12 cycles each of 3 orientations.
Note: Use 8"X5" PCB .031" thick 7" secure points on one long side and secure points at corners of opposite sides which parts mounted within 2 from any secure point. Test from 10-2000 Hz. Measurement at 24±2 hours after test conclusion.
LRN - Derating Curve
Rated power VS Ambient temperature (Power Derating Cruve)
Rated power VS Ambient temperature (Power Derating Cruve)
LRN - Packaging
LRN - Embossed Plastic Tape Specifications
LRN - Embossed Plastic Tape Specifications
Size A/mm B/mm W/mm E/mm F/mm P0/mm P1/mm P2/mm D0/mm T/mm Quantity (EA) / pieces
4312 4.3 12.5 24 1.55 7.5 6 12 12 1.50 3.8 2000
4320 7 12.5 24 1.55 11.2 6 12 12 1.50 3.8 1000
SMD Large Current Weld Precision Shunts LRN - Order Code
LRN 4 M R003 J
Type
LRN
Power (W)
4 4W
7 7W
Material
M Manganin
K Kamar
Resistance Value (Ω)
0m50 0.0005Ω
R002 0.002Ω
R003 0.003Ω
R010 0.01Ω
R030 0.03Ω
Tolerance (%)
J ±5%
G ±2
F ±1