Slide 1: Multilayer SMD NTC thermistors
Multilayer SMD NTC thermistors The preferred solution for temperature measurement and compensation TDK Electronics AG Piezo & Protection Devices Business Group Multilayer Business Unit
Slide 2: SMD NTC thermistors
SMD NTC thermistors ● NTC (Negative Temperature Coefficient) thermistors are thermally Ceramic sensitive resistors that show a decrease in resistance as temperature increases. ● Thanks to their excellent long-term stability, sensitivity, and accuracy, Terminal electrode NTC thermistors are the prefe
Slide 3: Resistance as a function of temperature
SMD NTC thermistors Resistance as a function of temperature The following equations describe with sufficient accuracy the resistance dependance on temperature: 𝐵 1 1 − 𝑇 ∙ 𝑇𝑁 𝑅𝑇 𝑇 ∙ 𝑇𝑁 𝑅𝑁 1 ⅆ𝑅 RT Resistance value in Ω at ambient temperature 𝑅𝑇 = 𝑅𝑁 ∙ 𝑒 𝑇 𝑇𝑁 𝐵= ∙ ln = ∙ ln 𝛼= ∙…
Slide 4: Temperature accuracy
SMD NTC thermistors Temperature accuracy The R tolerance at 25 °C and the B value tolerance define the tolerance of the thermistor over the temperature range 6.0 5.0 R25 Rtol B25/100 Btol DT @ DT @ W % K % 25 °C 100 °C 4.0 3.0 10 k 1% 3455 1% ±0.3 °C ±1.3 °C 2.0 1.0 𝚫T [±°C] 10 k 5% 3455 1% ±1.3 °C
Slide 5: Ordering codes
SMD NTC thermistors Ordering codes B57 3 32 V5 103 F 3 60 Dimensional drawings NTC thermistor Dimensions (mm) Case sizes: Case size 2 ≙ EIA chip size 0402 (1005) w EIA / mm l w h k 3 ≙ EIA chip size 0603 (1608) 0402 / 1005 1.0 ±0.1 0.5 ±0.05 0.6 max. 0.25 ±0.15 4 ≙ EIA chip size 0805 (2012) 620 ≙ EI
Slide 6: Standard series for non-automotive applications
SMD NTC thermistors Standard series for non-automotive applications EIA R25 ΔRR B25/50 B25/85 B25/100 ΔB25/100 Ordering code Features case size kΩ % K K K % 0402 10 ±0.5 (D), ±1 (F), ±3 (H), ±5 (J) 3380 3435 3455 ±1 B57230V2103+260 ● Accurate temperature sensing from -55 °C to +125 °C ±5 (J) ±3 0402
Slide 7: Automotive series overview
SMD NTC thermistors Automotive series overview EIA R25 ΔRR B25/50 B25/85 B25/100 ΔB25/100 Ordering code Features case size kΩ % K K K % + = Rtol 0402 4.7 ±5 (J) 3940 3980 4000 ±3 B57251V5472J060 ● Accurate temperature sensing from -40 °C to +150 °C 0402 10 ±0.5 (D), ±1 (F), ±3 (H), ±5 (J) 3380 3435
Slide 8: www.tdk.com
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