TL431 Datasheet – Shunt Regulator Diode – Motorola

Part Number : TL431

Function : Programmable Precision References

Package : TO 92, DIP 8 Pin, DIP 8 Pin Type

Manufactures : Motorola

Images and Pinouts :
TL431 Datasheet

Description :

The TL431, A, B integrated circuits are three–terminal programmable shunt regulator diodes. These monolithic IC voltage references operate as a low temperature coefficient zener which is programmable from V refto 36 V with two external resistors. These devices exhibit a wide operating current range of 1.0 mA to 100 mA with a typical dynamic impedance of 0.22 Ω. The characteristics of these references make them excellent replacements for zener diodes in many applications such as digital voltmeters, power supplies, and op amp circuitry. The 2.5 V reference makes it convenient to obtain a stable reference from 5.0 V logic supplies, and since the TL431, A, B operates as a shunt regulator, it can be used as either a positive or negative voltage reference.


1.  Programmable Output Voltage to 36 V
2. Voltage Reference Tolerance: ±0.4%, Typ @ 25°C (TL431B)
3. Low Dynamic Output Impedance, 0.22 ΩTypical
4. Sink Current Capability of 1.0 mA to 100 mA
5. Equivalent Full–Range Temperature Coefficient of 50 ppm/°C Typical
6. Temperature Compensated for Operation over Full Rated Operating Temperature Range
7. Low Output Noise Voltage

Block Diagram

TL431 Diagram

TL431 Datasheet




EF68B40P Datasheet PDF – Programmable Timer Module

Part Number : EF68B40P

Function : Frequency clock 2 MHz Programmable Timer

Package : DIP 28 Pin Type

Manufacturers : STMicroelectronics

Images :

EF68B40P datasheet

Description :

The EF6840 is a programmable subsystem component of the 6800 family designed to provide variable system time intevals. The EF6840 has three 16-bit binary counters, three corresponding control registers and a status register. These counters are under software control and may be used to cause system interrupts and / or generate output signals.


1. Operates from a single 5 V power supply
2. Single system clock required ( Enable )
3. Fully TTL compatible
4. Programmable interrupt (IRQ) output to MPU
5. Readable down counter indicates conunts to go to time-out
6. Three maskable outputs

Other data sheets within the file : EF6840, EF6840C, EF6840E, EF6840J, EF6840P, EF68A40P

EF68B40P Datasheet PDF Download

EF68B40P pdf