Document 550 SMT Power Transformers For Analog Devices ADM2485 Isolated RS-485 Transceiver • Developed specifically for Analog Devices ADM2485 Isolated RS-485 Transceiver for stepping up 5 V or 3.3 V to 6 V. • Center tapped primary and secondary windings • 2500 Vrms interwinding isolation. Core material Ferrite Terminations RoHS tin-silver over tin over nickel over phos bronze. Other terminations available at additional cost. Weight 0.94 – 1.0 g Ambient temperature –40°C to +125°C Storage temperature Component: –40°C to +125°C. Packaging: –40°C to +80°C Resistance to soldering heat Max three 40 second reflows at +260°C, parts cooled to room temperature between cycles Moisture Sensitivity Level (MSL) 1 (unlimited floor life at <30°C / 85% relative humidity) Failures in Time (FIT) / Mean Time Between Failures (MTBF) 38 per billion hours / 26,315,789 hours, calculated per Telcordia SR-332 Packaging 600/13″ reel Plastic tape: 24 mm wide, 0.37 mm thick, 16 mm pocket spacing, 6.1 mm pocket depth PCB washing Only pure water or alcohol recommended Part number1 DA2303-AL_ DA2304-AL_ Pri / sec voltage 5 V to 6 V 3.3 V to 6 V Inductance2 min (µH) 45.6 17.8 Leakage inductance4 max (µH) 1.0 0.43 DCR max (Ohms)3 pri sec 0.130 0.260 0.086 0.232 1. When ordering, please specify termination and packaging codes: Dot indicates pin 1 1 0.394 max 10,00 4 DA230X-AL CCIXXXX DA2303-ALD Termination: L = RoHS compliant tin-silver over tin over nickel over phos bronze. Special order: T = RoHS tin-silver-copper (95.5/4/0.5) or S = non-RoHS tin-lead (63/37). Packaging: D = 13″ machine ready reel. EIA-481 embossed plastic tape (600 per full reel). B = Less than full reel. In tape, but not machine ready. To have a leader and trailer added ($25 charge), use code letter D instead. 2. Inductance is tested between pins 4 and 3 at 500 kHz, 0.5 Vrms, 0 Adc. 3. DCR is per winding. 4. Leakage inductance is for the primary with both windings connected in series and with the secondary windings shorted. 5. Based on Bsat of the core at 25°C and number of turns on winding 4-3. 6. Calculated output power based on 150 kHz operating frequency. Power varies depending on application. 7. Operating temperature range -40°C to +85°C. 8. Electrical specifications at 25°C. Refer to Doc 362 “Soldering Surface Mount Components” before soldering. Volt-time product5 (V-µsec) 34.4 21.5 Power6 (W) 7.2 7.2 Turns ratio pri : sec 1 : 1.5 1 : 2.2 4 8 3 2 7 1 5 8 Pri 6 Sec 5 0.475 max 12,07 Primary windings and secondary windings to be connected in series on the PC board. 0.235 max 5,97 0.028 0,70 0.004 / 0,10 0.319 ±0.004 8,1 ±0,1 4 0.358 9,10 5 0.079 2,00 0.067 1,70 1 8 1 0.079 2,00 Dimensions are in 0.063 1,60 inches mm Specifications subject to change without notice. Please check our website for latest information. © Coilcraft, Inc. 2010 Recommended Land Pattern Document 550 Revised 01/05/09