Datasheet

1. General description
The TEA1708 is an automatic discharge IC for X capacitors with a low power consumption
(typically 1 mW at 230 V (AC).
A 500 V clamping circuit is integrated, protecting the IC during mains surges. In a typical
application with only two 200 k resistors, the maximum differential mode mains surge
voltage allowed exceeds 6 kV. A metal oxide varistor is not required to protect the IC.
The X capacitor discharge current is internally limited to 2.3 mA. The discharge delay
timer is set externally using a low voltage capacitor.
The very low power consumption in combination with a large discharge current enables
the use of a large value X capacitor to reduce EMI while retaining the low standby power.
2. Features and benefits
 1 mW power consumption at 230 V (AC)
 Integrated 500 V clamp; no metal oxide varistor required to protect the IC
 Self supplied, no external bias required
 Discharge current internally limited
 Adjustable discharge delay
 Very high differential surge: 6 kV with two 200 k resistors
 Easier application design, resolving EMI issues while retaining the efficiency level
3. Applications
 All AC connected power supplies with X capacitors > 100 nF requiring a low load
standby power.
4. Ordering information
TEA1708T
GreenChip X capacitor discharge IC
Rev. 1 — 25 September 2013 Product data sheet
Table 1. Ordering information
Type number Package
Name Description Version
TEA1708T SO8 plastic small outline package; 8 leads; body width 3.9 mm SOT96-1