NTC Accurate Thermistors NJ 28 – NI 24 – NK 20 High precision resistance and an outstanding ability to reproduce the sensibility index B, make these ranges of products the types of thermistors ideal for temperature measurement applications. Leaded or unleaded, these small size and rapid response time thermistors are able to meet the most accurate requirements. NJ 28 NP 30 NI 24 NK 20 Finish Coated chip with phenolic resin + varnish + tinned copper wires Coated chip with epoxy AWG30 insulated leads + Silver plated nickel wires Chip Coated chip with epoxy Marking 0.4 (.016) +10% -15% 2.4 (.094) max 3 (.118) max 3 (.118) max 2.4 (.094) max 0.57 (.022) +7% -7% 1. ± 75 ( 0. .0 25 69 (0 ) .1 0) 3.0 (.118) max 35 (1.38) min % 0.4 (.016) +10 - 15% 35 (1.38) min millimeters (inches) 3.0 (.118) max 3 (.118) max DIMENSIONS: 35 (1.38) min 2.8 (.110) max 2.8 (.110) max 0.75 (.030) ± 0.25 (.010) Types 1.75 (.069) ± 0.25 (0.10) On packaging only Operating temperature -55°C to +150°C Tolerance on Rn (25°C) ±1%, ±2%, ±3% Maximum dissipation at 25°C Thermal dissipation factor* 0.16 W 3 mW/°C 3 mW/°C 2 mW/°C 8s 8s 6s Thermal time constant Response time <2s TABLE OF VALUES Types N_ _ _ KA 0202 N_ _ _ MA 0302 N_ _ _ MA 0502 N_ _ _ MA 0103 N_ _ _ NA 0103 N_ _ _ PA 0203 N_ _ _ QA 0503 N_ _ _ RA 0104 Rn at 25°C (Ω) 2,000 3,000 5,000 10,000 10,000 20,000 50,000 100,000 Material Code KA MA MA MA NA PA QA RA B (K) 3625 ± 1% 3960 ± 0.5% 3960 ± 0.5% 3960 ± 0.5% 4100 ± 1% 4235 ± 1% 4250 ± 1% 4380 ± 1% ␣ at 25°C (%/°C) – 4.1 – 4.5 – 4.5 – 4.5 – 4.6 – 4.8 – 4.8 – 4.9 * – = Add type as outlined above (Example NJ 2 8). Resistance - Temperature characteristics: pages 29 to 33. HOW TO ORDER NJ28 MA 0502 Type Material Code MA (See table above) Resistance 5 kΩ F-- Tolerance F (±1%) 19 NTC Thermistors Manufacturing Process NJ 28 – NI 24 – NK 20 20