Overview
The TEA1708T/1J, produced by NXP USA Inc., is an automatic discharge IC designed for X capacitors. This GreenChip IC is characterized by its low power consumption, typically 1 mW at 230 V (AC), making it energy-efficient and suitable for various AC-connected power supply applications. The IC incorporates a 500 V clamping circuit, which protects it during mains surges, eliminating the need for a metal-oxide varistor. It also features a self-supplied operation, requiring no external bias, and an adjustable discharge delay timer set using an external low-voltage capacitor.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Package Type | SO8 plastic small outline package | 8 leads; body width 3.9 mm (SOT96-1) |
| Number of Terminations | 8 | |
| Terminal Pitch | 1.27 mm | |
| Terminal Position | DUAL | |
| Terminal Form | GULL WING | |
| Mounting Type | Surface Mount | |
| High Voltage (pins HV1 and HV2) | VTMR < 1.2 V | 2.5 - 4.5 μA |
| Clamp Voltage | 475 - 525 V | |
| Charge Threshold Voltage | 19 - 23 V | |
| Discharge Activation Threshold Voltage | 1.1 - 1.3 V | |
| Discharge Current (Internally Limited) | 1.8 - 2.8 mA | |
| RoHS Status | ROHS3 Compliant |
Key Features
- Low power consumption: typically 1 mW at 230 V (AC)
- Integrated 500 V clamping circuit for surge protection; no metal-oxide varistor required
- Self-supplied operation; no external bias needed
- Internally limited discharge current: 1.8 - 2.8 mA
- Adjustable discharge delay using an external low-voltage capacitor
- High differential surge protection: up to 6 kV with two 200 kΩ resistors
- Easier application design with reduced EMI while retaining low standby power
Applications
The TEA1708T/1J is suitable for all AC-connected power supplies that use X-capacitors greater than 100 nF and require low load standby power. This includes a wide range of applications such as:
- Power supplies with X-capacitors for filtering and noise reduction
- AC-DC converters requiring low standby power
- Electrical appliances and devices needing efficient and safe capacitor discharge mechanisms
Q & A
- What is the primary function of the TEA1708T/1J IC?
The primary function of the TEA1708T/1J IC is to automatically discharge X capacitors in AC-connected power supplies.
- What is the typical power consumption of the TEA1708T/1J at 230 V (AC)?
The typical power consumption is 1 mW at 230 V (AC).
- Does the TEA1708T/1J require an external bias?
No, the TEA1708T/1J is self-supplied and does not require an external bias.
- What is the maximum discharge current of the TEA1708T/1J?
The discharge current is internally limited to 1.8 - 2.8 mA.
- How is the discharge delay timer set in the TEA1708T/1J?
The discharge delay timer is set using an external low-voltage capacitor.
- What is the surge protection capability of the TEA1708T/1J?
The IC can handle differential surge voltages up to 6 kV with two 200 kΩ resistors.
- Is the TEA1708T/1J RoHS compliant?
- What type of package does the TEA1708T/1J come in?
The TEA1708T/1J comes in an SO8 plastic small outline package (SOT96-1) with 8 leads.
- What is the terminal pitch of the TEA1708T/1J?
The terminal pitch is 1.27 mm.
- What are the typical applications of the TEA1708T/1J?
The TEA1708T/1J is used in AC-connected power supplies with X-capacitors greater than 100 nF, requiring low load standby power.
