1. Product Overview:

️· Type: Four-terminal current sense resistors.
️· Purpose: Designed for measuring current flow in circuits.
️· Key Features:
- Low resistance values.
- Four-terminal design minimizes lead resistance effects.
- Variety of power ratings, tolerances, and termination options.

2. Ordering Information:

️· Part Number Format: CSR[Type] T TE [Resistance Value] [Tolerance Code]
- CSR: Series designation.
- Type: Can be 1 or 2 (referring to power ratings).
- T: Termination type (Sn).
- TE: Packaging style (Embossed plastic reel).
- [Resistance Value]: e.g., 10L0 (representing milliohms).
- [Tolerance Code]: D (±0.5%) or F (±1%).

3. Electrical Characteristics:

️· Power Ratings: 1W and 2W available.
️· Resistance Range: 5mΩ to 50mΩ (for CSR1), likely wider for CSR2.
️· Resistance Tolerance: ±0.5% (D) and ±1% (F).
️· Temperature Coefficient of Resistance (TCR): ±50 ppm/°C (typical).
️· Dielectric Withstanding Voltage: 500V.
️· Operating Temperature Range: -55°C to +125°C.

4. Physical Characteristics (Dimensions):

️· The datasheet provides tables outlining specific dimensions for both CSR1 and CSR2 models, including length, width, and terminal spacing. These are critical for PCB layout.

5. Performance Characteristics/Test Conditions:

️· Overload: Resistance measurement after application of 8x rated power for 5 seconds.
️· Solder Heat Resistance: Resistance measurement after exposure to a specific solder reflow profile.
️· Temperature Cycling: Measurement of resistance after repeated thermal cycling.
️· Moisture Resistance: Resistance tested after exposure to high humidity.
️· Endurance: Resistance measurement after a prolonged period at a specified temperature.

6. Typical Application:

️· The "Typical Circuit Schematic" shows a basic current measurement setup using the resistor as a shunt.

7. Important Notes:

️· Specifications are subject to change: Always verify the latest revision of the datasheet from KOA Speer's website.
️· Confirm Specifications: Before ordering, confirm the specifications to ensure suitability for the application.



This summary provides a comprehensive overview of the information contained in the KOA Speer CSR series datasheet.