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Specifications
Resistance:
50mΩ
Power(Watts):
3W
Type:
Current Sense Resistor
Tolerance:
±1%
Mfr. Part #:
73M3BR050F
Package:
2726
Key Attributes
Model Number:
73M3BR050F
Product Description
Product Overview
The 73M1A, 73M2A, 73M3x, and 73M5 Series Current Sensing Resistors are metal plate packaged devices designed for excellent accuracy in current detection and limiting applications. These resistors feature a special metallic resistor material for superior electrical and thermal characteristics, making them suitable for demanding industrial and electronic systems.
Product Attributes
- Brand: CTS Corporation
- Construction: Metal Plate
- Material: Copper Alloy
- Terminal Finish: Matte Tin [e3]
- Certifications: Reflow Capable per JEDEC J-STD-020, +260C Maximum
Technical Specifications
| Model Type | Power Rating [Watts] | Resistance Range [m] | Resistance Tolerance [%] | Rated Ambient Temperature | Operating Temperature Range | Temperature Coefficient |
| 73M1A | 1.0 | 0.25 - 50 | 1 | +70C | -55C to +155C | R < 0.010: 100ppm/C, R 0.010: 50ppm/C |
| 73M2A | 2.0 | 0.25 - 75 | 1 | +70C | -55C to +155C | R < 0.010: 100ppm/C, R 0.010: 50ppm/C |
| 73M3A | 3.0 | 0.25 - 3 | 1 | +70C | -55C to +155C | R 0.001: 200ppm/C, R > 0.001: 100ppm/C |
| 73M3B | 3.0 | 4 - 100 | 1 | +70C | -55C to +155C | 50ppm/C |
| 73M5 | 5.0 | 1 - 120 | 1 | +70C | -55C to +155C | R < 0.010: 100ppm/C, R 0.010: 50ppm/C |
Environmental Specifications
| Test | Maximum Delta R [%] | Test Description |
| Short-Time Overload | 0.5 | Applied electric power equal to 3 times rated power in 5s [JIS C 5201-1 4.13] |
| Short-Time Overload | 2.0 | Applied electric power equal to 3 times rated power in 5s [JIS C 5201-1 4.13] |
| Insulation Resistance | Over 109 ohm | Measured at terminals and center of resistor by D.C. 100V 15V in 1 minute [JIS C 5201-1 4.6] |
| Dielectric Withstanding Voltage | No Breakdown | Applied at terminals and center of resistor on A.C. 500V, 1 minute [JIS C 5201-1 4.7] |
| Resistance to Solder Heat | 0.5 | No Damage. Place on copper sheet [t = 0.2mm] heated by solder, +260C 5C, 5 0.5 seconds |
| Solderability | Over 95% Coverage | Immerse terminal in solder [Sn3Ag0.5Cu], +245C 0.5C, 3 0.5 seconds [JIS C 5201-1 4.17] |
| Vibration | 0.5 | No Damage. Frequency 10Hz to 55Hz, Pk-Pk amplitude 15mm, sweeping rate 1 minute, 3 directions each 2 hours [JIS C 5201-1 4.22] |
| Resistance to Solvent | No Damage | Immerse in Isopropyl alcohol, +20C to +25C, 60 5 seconds |
| High Temperature Exposure | 2.0 | 1,000 hours @ +155C 2C, bias load 0% power [JIS C 5201-1 4.23.2] |
| Change of Temperature | 0.5 | No Damage. 30 minutes @ -55C, 3 minutes @ +25C, 30 minutes @ +155C, 3 minutes @ +25C; 5 cycles |
| Moisture Resistance | 1.0 | MIL-STD-202, Method 106, 0% power 7a and 7b not required, 1 cycle = 24 hours, 10 cycles |
| Bias Humidity | 1.0 | 1,000 hours @ +85C 2C, 85% relative humidity, bias load 10%, on time 90 minutes/off time 30 minutes |
| Endurance [Rated Load] | 2.0 | 1,000 hours @ +70C 3C, bias load, on time 90 minutes/off time 30 minutes |
Applications
- Current Detection
- Current Limiting
- Regulated Battery Circuits
- Motor Control
- Power Supply
- Hard Disk Drives
- Inverter/Converter
- Industrial Equipment
- Infotainment Systems
Mechanical Specifications
| Model Type | Dimensions [mm] (L x W x t) | Resistance [m] |
| 73M1A | 3.2 0.3 x 1.6 0.3 x 0.6 0.3 | 0.25 - 50 |
| 73M2A | 6.3 0.3 x 3.2 0.3 x 1.3 Max. | 0.25 - 75 |
| 73M3A | 6.8 0.3 x 6.5 0.3 x 1.2 Max. | 0.25 - 3 |
| 73M3B | 7.2 0.3 x 6.7 0.3 x 1.3 Max. | 4 - 100 |
| 73M5 | 11.4 0.3 x 6.9 0.3 x 1.8 Max. | 1 - 120 |
Note: Dimensions are approximate and may vary. Refer to the package drawing for precise details.
2412111354_CTS-73M3BR050F_C4315236.pdf
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