1. Product Identification:

️· Product: SAW (Surface Acoustic Wave) Filter
️· Manufacturer: EPCOS AG
️· Model Number: B3884
️· Frequency: 439.25 MHz

2. Ordering Information & Packaging:

️· Ordering Codes: B39441-B3884-H310
️· Marking & Packaging: C61157-A7-A95
️· Packing: F61074-V8170-Z000

3. Key Features & Characteristics:

️· Operating Temperature: -40°C to +85°C
️· Storage Temperature: -40°C to +85°C
️· Source Power: 10 dBm
️· Nominal Frequency: 439.25 MHz
️· Insertion Loss (at nominal frequency): Typically around 6.5dB - 9.5dB (depending on the value)
️· Variation of Insertion Loss: ±0.7 dB
️· Frequency Response:
- Lower 3dB Frequency: 438.3 MHz
- Upper 3dB Frequency: 440.3 MHz
- Lower 35 dB Frequency: 436.8 MHz
- Upper 35 dB Frequency: 442.25 MHz
️· Amplitude Ripple: 0.1 dB
️· Temperature Coefficient of Frequency (TCf): -0.036 ppm/K²
️· Turnover Temperature (T0): 45°C

4. Matching Network:

️· The filter is designed for use with a matching network to 75Ω impedance.
️· Component values for the matching network:
- Ls1 = 39 nH
- Lp2 = 18 nH
- Lp3 = 18 nH
- Ls4 = 56 nH

5. Important Notes:

️· ESD Sensitivity: The device is ESD sensitive.
️· PCB Layout Dependence: Matching network component values are dependent on PCB layout.
️· Legal/Copyright: The datasheet is copyrighted by EPCOS AG, and reproduction requires their consent.
️· Standard Conditions: The datasheet refers to a standard temperature of 25°C for measurements.
️· Frequency Dependence: The value of f_c(T_A) depends on the turnover temperature T_0. The equation is: f_c(T_A) = f_c(T_0) * (1 + TC_f * (T_A - T_0))

In essence, this datasheet provides the technical specifications and necessary information to properly utilize the EPCOS B3884 SAW filter in a design.