| Parameters | 
                                                                                                            
                                            | Mount | Surface Mount | 
                                                                            
                                            | Mounting Type | Surface Mount | 
                                                                            
                                            | Package / Case | 20-SOIC (0.209, 5.30mm Width) | 
                                                                            
                                            | Number of Pins | 20 | 
                                                                            
                                            | Operating Temperature | 0°C~70°C | 
                                                                            
                                            | Packaging | Tube | 
                                                                            
                                            | Published | 2000 | 
                                                                            
                                            | Series | 74F | 
                                                                            
                                            | Part Status | Obsolete | 
                                                                            
                                            | Moisture Sensitivity Level (MSL) | 1 (Unlimited) | 
                                                                            
                                            | Type | Identity Comparator | 
                                                                            
                                            | Voltage - Supply | 4.5V~5.5V | 
                                                                            
                                            | Base Part Number | 74F521 | 
                                                                            
                                            | Output | Active Low | 
                                                                            
                                            | Operating Supply Voltage | 5V | 
                                                                            
                                            | Polarity | Inverting | 
                                                                            
                                            | Max Supply Current | 32mA | 
                                                                            
                                            | Number of Bits | 8 | 
                                                                            
                                            | Propagation Delay | 10 ns | 
                                                                            
                                            | Turn On Delay Time | 10 ns | 
                                                                            
                                            | Current - Output High, Low | 1mA 20mA | 
                                                                            
                                            | Max Propagation Delay @ V, Max CL | 10ns @ 5V, 50pF | 
                                                                            
                                            | Output Function | A=B | 
                                                                            
                                            | RoHS Status | RoHS Compliant | 
                                                                            
                                            | Lead Free | Lead Free | 
                                                                                                    
                            
                         
                                                74F521SJ Overview
The Packaging is made of Tube's materials.The 20-SOIC (0.209, 5.30mm Width) is well known in the electronics industry for its low package cost.Using 8 Bits, this electronic component was designed.Its performance-cost ratio makes the 74F Series an excellent value.Located in Surface Mount is this electronic part.In this case, Active Low is the electrical device's output.Providing 4.5V~5.5V Supply Voltage is necessary to ensure the device's normal functioning.In order to ensure its reliability, it operates at a temperature of 0°C~70°C.Applications for the Identity Comparator Type are standard grade.1mA 20mA features a High/Low output current which offers maximum design flexibility.Comparator is possible to establish Comparators related parts using the Base Part Number.There are  20 pins, which are pronged contacts as part of a signal interface in a computer or other communications device. There is a mounting direction of Surface Mount on this electronic part.Its maximum current is 32mA.Comparator is necessary to maintain a 5V supply voltage.
74F521SJ Features
20-SOIC (0.209, 5.30mm Width) package
8 Bits
74F series
74F521SJ Applications
There are a lot of ON Semiconductor 74F521SJ  applications of comparators. 
- Process contollenr
- Companion Appliceation Nole, ICAN-6374, "Application of the CMOS CD4059A Programmable Divide-by-N Counter in FM and Ctizens Band Transceiver Digital Tuners"
- “Time out" timer for consume-appication industrial controls
- Fixed or programmable irequency division
- Servo motor controls
- Servo Motor Controls
- Communications digltal frequency synthesizers: VHF, UHF, FM, AM, etc.