Latest News
Reverse Polarity Protection for Railway On-Board Supplies
Railway coaches are equipped with battery systems buffering the quite unstable power supply system, fed from the overhead contact line or from the diesel rail car. In case of a blackout, they keep supplying the lighting, air condition but also safety systems like door openers or similar. Like in automotive circuits, the electronic loads connected to such on-board supplies must be protected against accidentally happening reverse polarity, e. g. during maintenance or exchange of the battery.
Axial lead devices like the 10A/1000V diode P1000M are often the first choice since they can be welded or crimped directly into a cable connection. Higher power ratings are allowed by the 20A/1000V device P2000MTL or even by the 25A/1300…2000V type P2500Y.
NEW Application Note: How to Prolong Battery Lifetime
One way to make the battery system efficient is minimizing the energy usage while the system is runing or is in standby-mode. This can be realized by limiting the current drawn by the system from the battery. Thanks to Diotec's new LDO Voltage regulators LDI8119EN and LDI8233EN with Enable-function it is possible to switch-off the system, thus the input current will be limited usually up to 1.0 µA.
This simple solution will boost the efficiency of the battery system and prolong battery life. Due to the shutdown current of 0.4 µA - 1.0 µA the LDI8119EN and LDI8233EN are suitable in all battery management applications. Please refer to our Application Note for more detailed information.
LDO Voltage Regulator with Enable Function and Low Iq
LDO Voltage Regulator with Enable Function and low Iq
The Enable input (EN), available in positive and negative logic, turns the device on and off by an external signal. Active-high logic activates the device when the voltage at the EN-input exceeds the high-logic threshold. The active-low logic switches the device off when the EN-voltage falls below the logic low threshold. The EN-function is an import- ant feature when sequencing power supplies in multi-rail systems.
When the LDO is turned off and connected to the battery system, the input current will be limited, usually up to 1 µA. This Shutdown current is commonly confused with the quiescent current which is the current drawn by the device when it is enabled and opera- ting with no load. Both shutdown and quiescent current are important parameters when realizing long battery lifetimes in portable devices.
Diodes à la Carte: The BAV99 in Different Varieties
The BAV99 is a widely used small signal device in dual diode configuration. Its two diodes in series can be used for any kind of signal processing, and two parts can even form a bridge for high speed full wave rectifying. As different as the applications are the requirements on such device: High volume consumer devices require only low voltage levels, but especially low BOM costs. Industrial applications need higher power and voltage ratings, e. g. at 24 V industrial control units. Battery powered electronics must be operated with lowest possible leakage currents to allow for long stand-by times. In addition, parts might need full AEC-Q101 qualification, in case of automotive use.
Like choosing your favourite meal from a menu card, Diotec offers the BAV99 series from now on in different varieties, perfectly matching your particular needs:
* The BAV99-C in commercial grade, rather cost attractive and offering 70 V / 2.5 µA / 225 mW
* The industrial grade BAV99, having 85 V / 1 µA / 350 mW
* The AEC-Q101 qualified BAV99-AQ, again with 85 V / 1 µA / 350 mW
* The "high end" voltage version BAV99L, with 100 V / 1 µA / 350 mW
* The "low leakage" varieties BAV199 and BAV199-AQ, offering 85 V / 5 nA / 350 mW
Any wishes still open? This is just the beginning of further product series offering different parameters but also gradings, from commercial via industrial to AEC-Q101 qualified. We will keep you informed!
Happy Cows Served by Feeding Robots
Modern freestall barns allow cows to move around almost freely. Only when it comes to feeding, they move to their dedicated eating slot. Now the farmer must be fast, since the cattle wait impatiently. Feeding robots can take off the farmer from this boring but important job, required several times a day. It allows him to spend more time on other, more interesting items. When the robot has finished the job, it returns to the charging station where it gets recharged for the next feeding mission.
Diotec's SK36SMA, respectively SK36SMA-3G are 60V Schottky rectifiers in SMA offering a forward voltage drop of < 0.7V or even 0.55V (-3G) at 3A and are used in battery charging stations for feeding robots and others. These devices ensure a fast and reliable charging, and keep - in this particular case - the cows happy!
More Application Security for Our Customers by Comprehensive Data Sheet Disclaimer
We have added a comprehensive disclaimer to each of our data sheets, like almost every manufacturer is nowadays doing.
It clearly mentions the types of applications where special care and clarification is required, and provides even more security and support to customers when choosing our parts. Check it out on the example of UGB8JT.
- Products
- UGB8JT en > product > UGB8JT
- Applications
- Consumer en > application > consumer
- Product families
- Superfast Recovery Rectifiers en > productlist > SFR
Design Idea Dimmable LED Driver Circuit
Design-Idea: Dimmable LED Driver Circuit
Current Limiting Diodes (CLD), also known as Constant Current Regulators (CCR), can be used to drive LED strips used in modern lighting systems. They can be easily switched in parallel in order to achieve any driving current required for the used LED type. Their disadvantage is temperature dependency of regulation current, as well as inability to provide a dimming functionality. There is a wide variety of LED driving ICs available, using pulse width modulation (PWM) for dimming LED lamps. Switching frequency is high enough to avoid any flickering of the lamps. Dimming level is either taken from the traditional phase-angle-controlled mains, or from analogue/digital signals provided from smart home systems.
- Products
- BYG10M en > product > BYG10M
- CL10MD en > product > CL10MD
- MMBTA44 en > product > MMBTA44
- MMBTA94 en > product > MMBTA94
- MYS250 en > product > MYS250
- MYS380 en > product > MYS380
- P4SMA440CA en > product > P4SMA440CA
- S125K en > product > S125K
- S250 en > product > S250
- S250K en > product > S250K
- Load all entries
- S380 en > product > S380
- ZMD10 en > product > ZMD10
- Applications
- Lighting en > application > lighting
The SBCT30150 Schottky Diode for the Fast Charging of Power Tools
Whenever you want to repair something or, for instance, hang up shelves and small cabinets, power tools are useful assistants. Nowadays, most of them are battery-powered.
Dual Schottky diodes with common cathode are typically used as output rectifiers in forward converters, the usual circuit of fast battery chargers. Diotec’s SBCT30150 offering an I_FAV of 2 x 15 A and a V_RRM of 150 V is ideally suited for the established 18 V systems. This dual Schottky comes in the TO-220AB case outline and provides a low thermal resistance for good heat dissipation.
- Products
- SBCT30150 en > product > SBCT30150
- Applications
- Industrial en > application > industrial
- Product families
- Schottky Diodes en > productlist > SBD
Plasma EPOS Technology - "Green" Production of Power Semiconductors
In 1996, Diotec introduced its “Plasma EPOS Technology” that allows the omission of 1 200 m³ of chemicals in the last 25 years - equivalent to the filling level of a short-distance pool at the Olympics.
EPOS is the acronym for Etched and Protected On Slice. Instead of using toxic chemicals, the etching and first passivation are done using plasma under near-vacuum conditions.
This eco-friendly process is used in Diotec’s German and Slovenian Chipfab.
Plasma EPOS chips are assembled in all Melf and MiniMelf types, all Low Vf diodes, several Zener and TVS devices and some bridge rectifiers. Our Selection Guides provide an overview of our main products.
NEW: Application Note about Smart Meters
Smart Meters are getting the standard in electricity metering and replace the formerly used electro-mechanical solutions. „Smart“ has several meanings and starts with elect-ronic/micro-controller based metering, goes via comfortable user interface and display solutions and does still not end at various ways of connectivity. They are prepared for future ways of „smart“ billing, offering e. g. low costs for electric energy in times where wind and solar power is highly available.
The main function blocks for these devices are the power supply unit, the micro-controller board (MCU) and the communication and display boards. This application note focuses on the power supply unit, where Diotec offers several semiconductor solutions dedicated for Smart Meter needs. Take the example of input rectifier stage; it is connected directly to the landline and thus highly affected by excessive voltage peaks caused by lightning strikes. No matter if you prefer single diodes connected in series, avalanche rated rectifiers or Diotec‘s brand new 3000 V diodes: we offer you any solution according to your requirements.
- Applications
- Industrial en > application > industrial