TNY277GN - 18.5W Offline Flyback Switcher | Power Integrations
MPN: TNY277GN ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.25 | $1.25 |
| 10 | $1.12 | $11.20 |
| 100 | $0.98 | $98.00 |
| 500 | $0.85 | $425.00 |
| 1,000 | $0.75 | $750.00 |
TNY277GN Overview
An off-line switcher is a power management IC that converts AC mains voltage directly to a regulated DC output, typically using a flyback or buck topology. It integrates the power switch (MOSFET) and control circuitry into a single package, simplifying the design of AC-DC power supplies. The TinySwitch-III family is a specific series of off-line switchers from Power Integrations, known for their high efficiency, low standby power, and ease of use. These ICs are widely used in chargers, adapters, and auxiliary power supplies.
Key features of the TNY277GN include a 700 V MOSFET for wide input voltage handling, a user-selectable current limit for design flexibility, and built-in thermal shutdown for protection. The device also features frequency jittering to reduce EMI, making it easier to meet electromagnetic compatibility standards. Its ON/OFF control scheme provides excellent load regulation without the need for an optocoupler in many designs, simplifying the feedback loop.
Technically, the TNY277GN uses a current-mode control architecture with a high-voltage switched current source for startup, eliminating the need for a separate startup resistor. The device's EcoSmart technology ensures low standby power consumption, making it suitable for energy-efficient applications. The SMD-8C package is designed for surface-mount assembly, offering a compact footprint for space-constrained designs.
Typical applications include AC-DC adapters, battery chargers, standby power supplies for TVs and monitors, and auxiliary power supplies for appliances. The TNY277GN is particularly well-suited for applications requiring high efficiency and low standby power, such as Energy Star compliant products.
When designing with the TNY277GN, ensure proper transformer design and adequate PCB layout to minimize leakage inductance and EMI. The device's thermal shutdown feature protects against overtemperature conditions, but proper heat sinking through the PCB copper area is recommended for reliable operation at full load.
Drop-in alternatives for TNY277GN — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with TNY277GN (same form factor and footprint) — differing in Current Limit, Input Voltage Range, Package, Standby Power.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
TNY278GN
✅ Drop-In📋 Reference alternative (not in catalog)
TNY276GN
✅ Drop-In📋 Reference alternative (not in catalog)
TNY275GN
✅ Drop-In📋 Reference alternative (not in catalog)
TNY280GN
✅ Drop-In📋 Reference alternative (not in catalog)
TNY279GN
✅ Drop-In📋 Reference alternative (not in catalog)
TNY274GN
✅ Drop-In📋 Reference alternative (not in catalog)
TNY277GN Maximum Ratings & Electrical Characteristics
| Output Power (85-265 VAC) | 18.5 W |
| Output Power (230 VAC) | 23.5 W |
| Switching Frequency | 132 kHz |
| MOSFET Breakdown Voltage | 700 V |
| Topology | Flyback |
| Control Scheme | ON/OFF |
| Package | SMD-8C |
| Mounting Type | Surface Mount |
| Operating Temperature Range | -40°C to +150°C |
| Current Limit | User-selectable |
| Thermal Shutdown | Yes |
| Frequency Jittering | Yes |
| Standby Power | <50 mW at 230 VAC |
| RoHS Status | Compliant |
| Input Voltage Range | 85 VAC to 265 VAC |
TNY277GN Pin Configuration
| Pin 1 | BP/M — Bypass pin for internal supply, also used for current limit selection |
| Pin 2 | SOURCE — Source of internal MOSFET |
| Pin 3 | SOURCE — Source of internal MOSFET |
| Pin 4 | SOURCE — Source of internal MOSFET |
| Pin 5 | FEEDBACK — Feedback pin for ON/OFF control |
| Pin 6 | EN/UV — Enable/Under-voltage pin |
| Pin 7 | DRAIN — Drain of internal MOSFET |
| Pin 8 | DRAIN — Drain of internal MOSFET |
Typical Applications
TNY277GN is suitable for 6 applications: AC-DC Adapters, Battery Chargers, Standby Power Supplies, Auxiliary Power Supplies, LED Lighting, Home Appliances.
AC-DC Adapters
The TNY277GN is ideal for AC-DC adapters used in consumer electronics, providing up to 18.5W output. Its high efficiency and low standby power make it suitable for Energy Star compliant designs. The integrated 700V MOSFET simplifies the design and reduces component count, while the ON/OFF control scheme ensures stable output voltage without complex compensation.
Recommended
Battery Chargers
The TNY277GN is well-suited for battery chargers for mobile phones, tablets, and small appliances. Its universal input range (85-265 VAC) allows worldwide use, and the 18.5W output is sufficient for most portable devices. The device's thermal shutdown and current limit features protect the charger and battery from faults, ensuring safe operation.
Recommended
Standby Power Supplies
The TNY277GN is perfect for standby power supplies in TVs, monitors, and other appliances. Its low standby power (<50 mW) helps meet energy efficiency regulations. The device's EcoSmart technology reduces power consumption in no-load conditions, making it ideal for always-on applications. The compact SMD-8C package fits into space-constrained designs.
Recommended
Auxiliary Power Supplies
The TNY277GN can be used in auxiliary power supplies for industrial equipment, providing a regulated DC rail from AC mains. Its robust 700V MOSFET handles wide input variations, and the thermal shutdown ensures reliability in harsh environments. The device's frequency jittering reduces EMI, simplifying compliance with industrial standards.
Recommended
LED Lighting
The TNY277GN is suitable for LED lighting applications, such as LED drivers for residential and commercial lighting. Its high efficiency and low standby power contribute to energy savings. The device's constant voltage output can be used with a constant current stage for LED driving. The compact package allows for slim LED driver designs.
Recommended
Home Appliances
The TNY277GN is used in home appliances such as washing machines, refrigerators, and air conditioners for control and display power supplies. Its wide input range and robust protection features make it suitable for appliances that experience voltage fluctuations. The device's low standby power helps appliances meet energy efficiency standards.
Recommended
Recommended Products Summary
Engineering reference data for TNY277GN — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TNY278GN | TNY276GN | TNY275GN | TNY280GN | TNY279GN | TNY274GN |
|---|---|---|---|---|---|---|---|
| Package | SMD-8C | SMD-8C | SMD-8C | SMD-8C | SMD-8C | SMD-8C | SMD-8C |
| Brand | Power Integrations | Power Integrations | Power Integrations | Power Integrations | Power Integrations | Power Integrations | Power Integrations |
| Output Power (85-265 VAC) | 18.5 W | 21.5 W | 15 W | 11.5 W | 28.5 W | 25 W | 8.5 W |
| Switching Frequency | 132 kHz | 132 kHz | 132 kHz | 132 kHz | 132 kHz | 132 kHz | 132 kHz |
| MOSFET Breakdown Voltage | 700 V | 700 V | 700 V | 700 V | 700 V | 700 V | 700 V |
| Control Scheme | ON/OFF | ON/OFF | ON/OFF | ON/OFF | ON/OFF | ON/OFF | ON/OFF |
| Thermal Shutdown | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Standby Power | <50 mW | <50 mW | <50 mW | <50 mW | <50 mW | <50 mW | <50 mW |
Key Differentiators
- Integrated 700V MOSFET (vs TNY276GN)
- Higher output power than TNY275GN (vs TNY275GN)
- Lower standby power than TNY280GN (vs TNY280GN)
Design Notes
For optimal thermal performance, ensure a large copper area on the PCB connected to the SOURCE pins (pins 2, 3, 4). This helps dissipate heat from the internal MOSFET. Use multiple vias to connect the top and bottom layers for better heat spreading. Refer to the TinySwitch-III datasheet for recommended PCB layout guidelines.
The BP/M pin (pin 1) is used for bypassing the internal supply and also for selecting the current limit. Connect a 0.1 µF capacitor between BP/M and SOURCE. Do not leave this pin unconnected. The current limit selection is done by the value of this capacitor; refer to the datasheet for the correct value for your application.
The TNY277GN features frequency jittering to reduce EMI. To further minimize EMI, place a small ferrite bead on the drain connection and ensure the transformer is properly shielded. Follow the layout recommendations in the datasheet to keep the high-voltage traces short and away from sensitive control circuitry.
Compliance Information
RoHS compliant per Power Integrations. Not AEC-Q100 qualified as it is not an automotive-grade part.
