RFM products are now Murata products. RF3181D Ideal Front-End Filter for 916.5 MHz Wireless Receivers Low-Loss, Coupled-Resonator Quartz Design Pb Simple External Impedance Matching 916.5 MHz Complies with Directive 2002/95/EC (RoHS) SAW Filter The RF3181D is a low-loss, compact, and economical surface-acoustic-wave (SAW) filter designed to provide front-end selectivity in 916.5 MHz receivers. Receiver designs using this filter include superhet with 10.7 MHz IF, direct conversion and superregen. Typical applications of these receivers are wireless remote-control and security, data telemetry, and meter reading devices operating in the USA under FCC Part 15 and in Canada under DoC RSS-210. This coupled-resonator filter (CRF) uses selective null placement to provide suppression, typically greater than 40 dB, of the LO and image spurious responses of superhet receivers with 10.7 MHz IF. Muratas advanced SAW design and fabrication technology is utilized to achieve high performance and very low loss with simple external impedance matching (not included). SM3838-8 Case 3.8 x 3.8 Characteristic Sym Notes Minimum Typical Maximum Units f Center Frequency at 25C Absolute Frequency 916.5 MHz c 1, 2, 3 f Tolerance from 916.50 MHz c kHz Insertion Loss IL 1, 3 2.5 4.0 dB BW 1, 3 3 dB Bandwidth 500 600 900 kHz 3 Rejection (Attenuation: relative to Min IL:) 10 to 895 MHz 40 50 895 to 906 MHz 30 35 906 to 910 MHz 25 30 922 to 925 MHz 1, 3 35 40 dB 925 to 933 MHz 14 18 933 to 940 MHz 30 35 940 to 1100 MHz 40 45 ppm/ 3, 4 2 Temperature Freq. Temp. Coefficient FTC 0.032 C Frequency Aging Absolute Value during the First Year fA 5 10 ppm/yr Input Z = R /C Z IN IN IN IN 37 // 1.6pF 1 Impedance f Output Z = R /C Z 25 // 1.8pF C OUT OUT OUT OUT Lid Symbolization (in addition to Lot and/or Date Codes) 671 // YWWS Standard Reel Quantity 7 Inch Reel 500 Pieces/Reel 9 Standard Reel Quantity 13 Inch Reel 3000 Pieces/Reel CAUTION: Electrostatic Sensitive Device. Observe precautions for handling. NOTES: 1. Unless noted otherwise, all measurements are made with the filter installed in the specified test fixture which is connected to a 50 test system with VSWR 1.2:1. The test fixture L and C are adjusted for minimum insertion loss at the filter center frequency, f . Note that insertion loss and bandwidth and passband shape are dependent on c the impedance matching component values and quality. 2. The frequency f is defined as the midpoint between the 3dB frequencies. c 3. Where noted specifications apply over the entire specified operating temperature range of -40 to 90C. 4. The turnover temperature, T , is the temperature of maximum (or turnover) frequency, f . The nominal frequency at any case temperature, T , may be calculated from: O o c 2 f=f 1 - FTC (T -T ) . o o c 5. Frequency aging is the change in fc with time and is specified at +65C or less. Aging may exceed the specification for prolonged temperatures above +65C. Typically, aging is greatest the first year after manufacture, decreasing significantly in subsequent years. 6. The design, manufacturing process, and specifications of this device are subject to change. 7. One or more of the following U.S. Patents apply: 4,54,488, 4,616,197, and others pending. 8. All equipment designs utilizing this product must be approved by the appropriate government agency prior to manufacture or sale. 9. Tape and Reel Standard for ANSI/EIA 481. 2010-2015 by Murata Electronics N.A., Inc. RF3181D (R) 4/7/15 Page 1 of 2 www.murata.com Rating Value Units Input Power Level 10 dBm DC Voltage 12 VDC Storage Temperature -40 to +125 C Operable Temperature Range -40 to +125 C Soldering Temperature (10 seconds / 5 cycles max.) 260 C Electrical Connections B C E 8 8 Pin Connection H 1 7 7 1 1 Input Ground A 2 6 6 2 G 2 Input 3Ground 3 5 5 3 4 Case Ground 5 Output Ground 4 4 D F 6 Output 7Ground 8 Case Ground Matching Circuit to 50 Case Dimensions mm Inches Dimension Min Nom Max Min Nom Max 7 1 A 3.6 3.8 4.0 0.14 0.15 0.16 10 nH 8.2 nH 8 Input Output 6 2 B 3.6 3.8 4.0 0.14 0.15 0.16 4 C 1.00 1.20 1.40 0.04 0.05 0.055 5 3 D 0.95 1.10 1.25 0.033 0.043 0.05 E 0.90 1.0 1.10 0.035 0.04 0.043 F 0.50 0.6 0.70 0.020 0.024 0.028 G 2.39 2.54 2.69 0.090 0.100 0.110 H 1.40 1.75 2.05 0.055 0.069 0.080 OPTIONAL Electrical Connections Matching Circuit to 50 Pin Connection 1 Input 8.2 nH 2 Input Ground Input 7 1 3 Ground 8 6 2 4 Case Ground 10 nH 4 5 Output Output 5 3 6 Output Ground 7 Ground 8 Case Ground 2010-2015 by Murata Electronics N.A., Inc. www.murata.com RF3181D (R) 4/7/15 Page 2 of 2