USR 2-0808 Precision Foil Resistors • • • • • Resistances from 1Ohm to 300kOhms Power Rating to 0.6 Watts Resistance Tolerances to ±0.005% TCR to ±1ppm/°C Load Stability to 0.01% SPECIFICATIONS Type USR 2-0808 Resistance Range 1.0 to 300 kOhms 0.6W (<100 kOhms) 0.4W (>100 kOhms) Power rating (70°C) Tolerances from 1.0 Ohms from 5.0 Ohms from 12.0 Ohms from 25.0 Ohms from 100.0 Ohms 0.5% / 1% 0.05% / 0.1% / 0.25% / 0.5% / 1% 0.02% / 0.05% / 0.1% / 0.25% / 0.5% / 1% 0.01% / 0.02% / 0.05% / 0.1% / 0.25% / 0.5% / 1% 0.005% / 0.01% / 0.02% / 0.05% / 0.1% / 0.25% / 0.5% / 1% Stability 0.01% 25ppm / ∆R after 1 year 50ppm / ∆R after 3 year Shelf Life Stability Temperature Coefficient max. ±5ppm/°C (-55 to 155°C) typ. ±3ppm/°C (-55 to 125°C) upon request ±1ppm/°C (0 to 60°C) and ±1ppm/°C (-55 to 125°C) Insolation Resistance > 10GOhm Thermal EMF < 0.1µV/°C Operating Temperature Range -55 to 155°C Resistor Material NiCr-Foil Al2O3 Substrate Housing PBTP / Epoxy Connector Material Cu tinned Terminals 2 Ordering Information Part Description: Part Type - Resistance - Grid Type Tolerance - TCR Example: USR 2-0808 478 kOhms D 0.1% 5ppm Grid D = 3.81mm (0.15inches) Lead Spacing Grid J = 5.08mm (0.2inches) Lead Spacing If none specified, Grid D is default Riedon Inc. 300 Cypress Avenue Alhambra CA 91801 (626) 284-9901 (626) 284-1704 www.riedon.com 6/13 USR 2-0808 Precision Foil Resistors SPECIFICATIONS (continued) Derating Power (% from nominal power) 120 100 80 60 40 20 0 50 70 85 100 115 130 145 155 Ambient Temperature (°C) Temperature Coefficient 800 600 +5ppm/°C -5ppm/°C ∆R/R (ppm) 400 200 Nominal Spread ±2.3ppm/°C 0 -200 Nominal ∆R/R -400 Nominal Spread ±2.3ppm/°C -600 -800 -50 -25 0 25 50 100 75 125 Temperature (°C) DIMENSIONS Type USR 2-0808 Grid D E USR 2-0808 Grid J Dimension mm tol. (±mm) inches tol. (±inches) A 28.30 2.0 1.11 0.079 B 7.62 0.1 0.30 0.004 C 8.30 0.2 0.33 0.008 D 2.00 0.1 0.08 0.004 E 3.81 0.1 0.15 0.004 F 2.67 0.1 0.11 0.004 G G (>150kOhms) Ø0.64 Ø0.3 0.1 Ø0.03 Ø0.012 0.004 A 28.00 2.0 1.10 0.079 B 7.49 0.1 0.29 0.004 C 8.00 0.2 0.31 0.008 D 2.00 0.1 0.08 0.004 E 5.08 0.1 0.20 0.004 F 2.49 0.1 0.10 0.004 G G (>150kOhms) Ø0.64 Ø0.3 0.1 Ø0.03 Ø0.012 0.004 Riedon Inc. 300 Cypress Avenue Alhambra CA 91801 (626) 284-9901 (626) 284-1704 www.riedon.com 6/13