Description
The MF52 series is a precision bead-type NTC thermistor designed for temperature measurement and compensation in consumer electronics, HVAC systems, automotive applications, and battery packs . It features a B25/50 value of 3950K and is available in resistance values from 1KΩ to 100KΩ at 25°C.
The 5% resistance tolerance makes this variant suitable for applications where absolute temperature precision is not critical, such as general-purpose temperature monitoring, thermal protection circuits, and cost-sensitive consumer products. The epoxy coating provides mechanical protection and electrical insulation, while the small bead size (approximately 1.7mm pitch for the MF52A series) allows integration into tight spaces .
The thermistor’s resistance decreases as temperature rises. To read temperature with a microcontroller, it is placed in a voltage divider with a fixed resistor (typically equal to the nominal R25 value, e.g., 10KΩ), and the ADC value is converted to resistance, then to temperature using the Beta equation or the Steinhart-Hart equation .
Critical limitations: NTC thermistors are non-linear, and the Beta equation is an approximation that is most accurate near 25°C. The 5% tolerance on R25 means individual units can vary by ±5% from the nominal value, which translates to a temperature error that depends on the Beta value and the temperature range. For applications requiring tight accuracy, the 1% variant is more appropriate. Self-heating can also cause errors if the measurement current is too high.
Features
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5% Resistance Tolerance: Cost-effective option for applications where ±5% R25 variation is acceptable .
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B25/50 = 3950K: Standard Beta value with wide library and community support.
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Wide Resistance Selection (1K–100KΩ): Choose the nominal value that best matches your voltage divider and ADC range.
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Black Epoxy Coating: Protects the bead and provides electrical insulation.
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Small Bead Size: Compact footprint suitable for PCB mounting and tight spaces.
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Fast Thermal Response: Thermal time constant typically ≤7–15 seconds depending on variant .
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Wide Operating Temperature: Typically -30°C to +125°C or -55°C to +125°C depending on the specific part .
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Low Cost and Widely Available: Common thermistor type with abundant library support.
Technical Specifications
| Parameter | Specification |
|---|---|
| Series | MF52 |
| B25/50 Value | 3950K (tolerance: verify, often ±1%) |
| R25 Tolerance | ±5% |
| Resistance Options | 1K, 2K, 3K, 3.3K, 4.7K, 5K, 6.8K, 10K, 15K, 20K, 30K, 40K, 47K, 50K, 100KΩ |
| Operating Temperature | -30°C to +125°C (typical) |
| Max Power Dissipation | 50mW |
| Thermal Dissipation Coefficient | ≥2mW/°C |
| Thermal Time Constant | ≤7–15s |
| Coating | Black epoxy |
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