NXP Semiconductors TEA1703T/N1,118

Overview

TEA1703T/N1,118 from NXP Semiconductors is a GreenChip SMPS standby controller IC designed for ultra-low-no-load standby power in AC-DC adapters. It integrates a switched-mode optocoupler driver, senses output voltage (via VSENSE), output power (via PSENSE), and switching activity (via SWDET), and delivers typical supply current of 30 μA with <0.5 mW consumption in notebook adapter applications.

For engineers reviewing the TEA1703T/N1,118 datasheet, TEA1703T/N1,118 pinout, TEA1703T/N1,118 application, or TEA1703T/N1,118 equivalent, key selection considerations include its 8-pin SO8 package, 0.5 V power-sense threshold, 1.22 V voltage-sense threshold, 28 kHz oscillator frequency, and patented open-drain optocoupler drive architecture enabling high CTR at low average current.

Technical Context

The TEA1703T/N1,118 implements dual-sensing control: voltage sense at pin VSENSE uses a 1.22 V threshold with −0.94 μA output current to generate hysteresis via external resistive dividers, while power sense at pin PSENSE triggers standby entry when voltage falls below 0.5 V. Its internal latched SWDET input requires ≥1.3 μA detection current to enable standby mode only during active primary-side switching.

Standby operation is executed via an open-drain OPTO output with 100 Ω R_DS(on), 1.42 μs on-time, and 28 kHz fixed-frequency pulse drive-enabling efficient optocoupler excitation using an external series inductor instead of lossy resistive limiting. This architecture maintains high Current Transfer Ratio (CTR) while keeping average diode current sub-μA.

Key Specifications

Pinout & Package

TEA1703T/N1,118 is housed in an SO8 plastic small outline package (SOT96-1), 8-lead, 3.9 mm body width, with standard JEDEC MS-012 footprint and 160 K/W junction-to-ambient thermal resistance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar SMPS standby controller applications.

Compared with NCP101x and VIPer06XS, the TEA1703T/N1,118 uniquely delivers sub-0.5 mW standby through integrated dual-sense logic and patented pulsed optocoupler drive-making it the only solution capable of meeting stringent ERP Tier 2 and DOE Level VI without auxiliary circuitry.

Availability

TEA1703T/N1,118 is available at Aetrix Electronics and suitable for USB-C notebook adapters, energy-efficient wall adapters, smart home power supplies, and IoT gateway AC-DC converters requiring stable component supply and long-term lifecycle support.

Supply support for TEA1703T/N1,118 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

NXP Semiconductors is a Dutch semiconductor company specializing in secure connectivity solutions, automotive processors, and energy-efficient power management ICs.

The TEA1703T/N1,118 belongs to NXP's GreenChip family of high-efficiency AC-DC controller ICs, engineered specifically for ultra-low standby power in consumer and computing power supplies.

FAQ

What is the primary function of the TEA1703T/N1,118 in an AC-DC power supply?

The TEA1703T/N1,118 serves as a secondary-side standby controller IC that monitors output voltage (VSENSE), output power (PSENSE), and primary-side switching activity (SWDET) to enable ultra-low-no-load operation. It drives an optocoupler via its OPTO pin to signal the primary controller to enter or exit standby mode. The TEA1703T/N1,118 achieves this with only 31 μA typical supply current and patented pulsed drive architecture.

How does the TEA1703T/N1,118 achieve sub-0.5 mW standby power consumption?

The TEA1703T/N1,118 achieves sub-0.5 mW standby power by combining ultra-low 31 μA quiescent current with a switched-mode optocoupler driver that pulses at 28 kHz with 1.42 μs on-time. This preserves high Current Transfer Ratio (CTR) while minimizing average LED current-avoiding the >95% power loss typical of resistor-limited optocoupler drive. The TEA1703T/N1,118 implements this in real-world notebook adapters with verified <0.5 mW system-level consumption.

What is the role of the SWDET pin on the TEA1703T/N1,118?

The SWDET pin on the TEA1703T/N1,118 is a latched switching detection input requiring ≥1.3 μA current to confirm the primary-side controller is actively switching. It prevents the TEA1703T/N1,118 from activating standby mode during fault conditions such as latched overvoltage protection, ensuring safe re-enablement only after normal operation resumes. This behavior is explicitly documented in Section 7.5 of the TEA1703T/N1,118 datasheet.

Can the TEA1703T/N1,118 be used with standard optocouplers, or does it require special components?

The TEA1703T/N1,118 is compatible with standard low-cost optocouplers (e.g., PC817, LTV-817) but requires an external series inductor-not a resistor-to realize its patented switched-mode drive benefit. Driving with a resistor wastes >95% of energy; the inductor enables efficient energy transfer, improving drive efficiency by 10×. The TEA1703T/N1,118's OPTO pin delivers 28 kHz pulses with 1.42 μs on-time, and its internal 100 Ω R_DS(on) is optimized for this topology.

What package type and pin count does the TEA1703T/N1,118 use?

The TEA1703T/N1,118 uses an 8-pin SO8 plastic small outline package (SOT96-1) with 3.9 mm body width and JEDEC MS-012 footprint. Pin assignments include VCC (1), GND (2), OPTO (3), two n.c. pins (4,5), SWDET (6), PSENSE (7), and VSENSE (8). This package is verified in Table 1 and Figure 2 of the official TEA1703T/N1,118 datasheet and supports standard reflow soldering profiles.