BF494 Datasheet – NPN Frequency Transistor – NXP

Part Number : BF494

Function : NPN medium frequency transistors

Package :  TO92, SOT54 Package

Manufactures : Philips, NXP


BF494 NPN transistor


NPN medium frequency transistor in a TO-92; SOT54 plastic package.



BF494 datasheet pinout

1. Low current (max. 30 mA)
2. Low voltage (max. 20 V).


1. HF applications in radio and television receivers
2. FM tuners
3. Low noise AM mixer-oscillators
4. IF amplifiers in AM/FM receivers.


BF494 Datasheet


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TSA5527T Datasheet PDF – PLL Frequency Synthesizer

Part Number : TSA5527T

Function : 1.3 GHz universal bus-controlled TV synthesizer

Package : SO, SSOP 16 Pin Type

Manufacturers : Philips Electronics ( )

Pinouts :

TSA5527T datasheet

Description :

The device is a single-chip PLL frequency synthesizer designed for TV and VCR tuning systems. The circuit consists of a divide-by-eight prescaler with its own preamplifier, a 15-bit programmable divider, a crystal oscillator and its programmable reference divider and a phase/frequency detector combined with a charge-pump which drives the tuning amplifier and the 33 V output. Four high-current PNP band switch buffers are provided for band switching. Two PNP buffers can be switched on simultaneously. The sum of the collector currents is limited to 50 mA.


1. Complete 1.3 GHz single chip system
2. Four PNP band switch buffers (40 mA)
3. 33 V output tuning voltage
4. In-lock detector
5. 5-step ADC
6. 15-bit programmable divider
7. Low power and low radiation

Block Diagram


1. TV tuners and front ends
2. VCR tuners.

Other data sheets within the file :

TSA5526, TSA5526AM, TSA5526AT, TSA5526M, TSA5526T,

TSA5527, TSA5527AM, TSA5527AT, TSA5527M

TSA5527T Datasheet PDF Download

TSA5527T pdf