The ZHT431 is a three terminal adjustable shunt regulator offering excellent temperature stability and output current handling capability up to 100mA. The device offers extended operating temperature range working from -55 to +125°C. The output voltage may be set to any chosen voltage between 2.5 and 20 volts by selection of two external divider resistors.
The devices can be used as a replacement for zener diodes in many applications requiring an improvement in zener performance.

*Surface mount SOT223 and SOT23 packages
*2% and 1% tolerance
*Maximum temperature coefficient 67 ppm/°C
*Temperature compensated for operation over the full temperature range
*Programmable output voltage
*50A to 100mA current sink capability
*Low output noise
*Wide temperature range -55 to +125°C

*Series and shunt regulator
*Voltage monitor
*Over voltage / under voltage protection
*Switch mode power supplies


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The ZXLD1322 is an inductive DC-DC converter, with an internal switch, designed for driving single or multiple LEDs in series up to a total of 700mA output current.
Applications cover input voltages ranging from 2.5V to 15V. Depending upon supply voltage and external components, this can provide up to 12W of output power.
The device employs a variable 'on' and 'off' time control scheme with adjustable peak switch current limiting and operates in Buck/Boost mode, offering higher power efficiency and lower system cost than conventional PFM buck/boost circuitry.
The device includes the DC-DC converter, a high-side current monitor and an NPN switching transistor to provide an integrated solution offering small PCB size, competitive cost/performance, high power efficiency of DC-DC conversion and maximum LED brightness/reliability. More importantly, it retains design flexibility to add customer specific features.
The feedback control circuitry inside the ZXLD1322 provides excellent load and current regulation, resulting in very stable LED current over the useful life of the battery and over the full operating temperature range.
The LED current can be adjusted from 100% down to 10% of the set value by applying a dc voltage to the ADJ pin and down to 1% by applying a PWM signal. An on-chip LED protection circuit also allows output current to be reduced linearly above a predetermined threshold temperature using an external thermistor at the TADJ pin.
External resistors set nominal average LED current and coil peak current independently.
The device can be shut down by applying a continuous low level dc voltage to the ADJ pin.

*2.5V to 15V Input Voltage Range
*Up to 700mA output current
*Typical efficiency# >80%
*User-defined thermal control of LED output current using external thermistor
*High output current stability over input voltage and temperature
*12μA typical standby current
*LED current adjustable from 100% down to 2%
*Adjustable Soft-Start
*Capable of driving 3 LEDs in series

*High power LED flashlights
*LED back-up lighting
*General LED lighting


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This new generation Trench MOSFET from Zetex has been designed to minimize the on-state resistance (RDS(on)) and yet maintain superior switching performance making it ideal for high efficiency power management applications.

*Low on-resistance
*Fast switching speed
*Low gate drive
*SO8 package

*DC-DC Converters
*Power management functions
*Disconnect switches
*Motor control


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Packaged in the SOT223 outline this new low saturation NPN transistor offers extremely low on state losses making it ideal for use in DC-DC circuits and various driving and power management functions.

*Higher power dissipation SOT223 package
*High gain
*High peak current
*Low saturation voltage
*70V forward blocking voltage
*4.5V reverse blocking voltage

*DC - DC converters
*Motor drive
*Relay, lamp and solenoid drive
*Regulator circuits


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The ZXGD3101 is intended to drive MOSFETS configured as ideal diode replacements. The device is comprised of a differential amplifier detector stage and high current driver. The detector monitors the reverse voltage of the MOSFET such that if body diode conduction occurs a positive voltage is applied to the MOSFET's Gate pin.
Once the positive voltage is applied to the Gate the MOSFET switches on allowing reverse current flow. The detectors' output voltage is then proportional to the MOSFET Drain-Source reverse voltage drop and this is applied to the Gate via the driver. This action provides a rapid turn off as current decays.

• Turn-off propagation delay 15ns and turnoff time 20ns
• Suitable for Discontinuous Mode (DCM), Critical Conduction Mode (CrCM) and Continuous mode(CCM) operation
• Compliant with Energy Star V2.0 and European Code of Conduct V3
• Low component count
• Halogen free
• 5-15V VCC range

Flyback converters in:
• Adaptors
• LCD monitors
• Server PSU’s
• Set top boxes


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Packaged in the SOT89 outline this new low saturation NPN transistor offers extremely low on state losses making it ideal for use in DC-DC circuits and various driving and power management functions.

*7.5A continuous current
*Up to 20A peak current
*Very low saturation voltage
*70V forward blocking voltage
*4.5V reverse blocking voltage

*Emergency lighting circuits
*Motor driving
*Camera strobe
*Boost converter
*CCFL backlight inverters
*MOSFET gate drivers
*LED Driving


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This design note shows the ZXSC400 driving a single 3W LED. The input voltage ranges from 1.8V to 3.6V with constant output current of 700mA down to 2.6V with an overall 80% of efficiency.
Figure 1 shows typical constant current solution with ZXSC400 driving one 3W LED. The input
voltage range allows the use of two alkaline batteries or one Lithium Ion cell (CR123A) for
portable flashlight applications.
Q1 and Q2 forms a pseudo Darlington pair which provide enough current gain for a switching
current up to 1.5A. In order to provide better switch off performance, a Schottky diode, D2, is used to drain the base current from the base of Q1 directly. In order to achieve higher efficiency, current monitor U2 is used to provide a low voltage drop LED current sensing through the low ohmic resistor, R2. The LED current is converted to 300mV feedback voltage through R3.

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Device Description
A range of silicon varactor diodes for use in frequency control and filtering.
Featuring closely controlled CV characteristics and high Q.
Low reverse current ensures very low phase noise performance.
Available in single or dual common cathode format in a wide rage of miniature surface mount packages.

* Close tolerance C-V characteristics
* Octave tuning from 0 to 6V
* Low IR (typically 200pA)
* Excellent phase noise performance
* High Q

* Wireless communications
* Pagers
* Mobile radio


TAG Diodes

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Advanced process capability has been used to achieve this high performance device. Combining two NPN transistors in the SM-8 package provides a compact solution for the intended applications.

* Dual NPN device
* Very low saturation voltage
* High gain
* SM 8 package

* CCFL invertors
* Royer circuits


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This new 4th generation ultra low saturation transistor utilises the Zetex matrix structure combined with advanced assembly techniques to give extremely low on state losses.
This makes it ideal for high efficiency, low voltage switching applications.

* Extremely Low Equivalent On Resistance
* Extremely Low Saturation Voltage
* hFE characterised up to 5A
* IC=2A Continuous Collector Current
* MSOP8 package

* DC - DC Converters
* Power Management Functions
* Power switches
* Motor control


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