TNY277 GN 1 2 3
Power Integrations

TNY277GN - 18.5W Offline Flyback Switcher | Power Integrations

MPN: TNY277GN βœ“ Active
In Stock Ships in 1-3 business days
700 V Vdss User-selectable Id SMD-8C Package 132 kHz Speed
From $0.75 USD / Unit
MOQ: 1 |
Price updated: 2026-08-21
Volume Pricing
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
ℹ️ All prices are in USD
View Datasheet (PDF) View Alternatives

Drop-in alternatives for TNY277GN β€” same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.

Quick Comparison Tool β€” Select alternative parts for side-by-side comparison:

TNY278GN

βœ… Drop-In
πŸ“¦ SMD-8C
Higher output power (21.5W vs 18.5W), same pinout

πŸ“‹ Reference alternative (not in catalog)

TNY276GN

βœ… Drop-In
πŸ“¦ SMD-8C
Lower output power (15W vs 18.5W), same pinout

πŸ“‹ Reference alternative (not in catalog)

TNY275GN

βœ… Drop-In
πŸ“¦ SMD-8C
Lower output power (11.5W vs 18.5W), same pinout

πŸ“‹ Reference alternative (not in catalog)

TNY280GN

βœ… Drop-In
πŸ“¦ SMD-8C
Higher output power (28.5W vs 18.5W), same pinout

πŸ“‹ Reference alternative (not in catalog)

TNY279GN

βœ… Drop-In
πŸ“¦ SMD-8C
Higher output power (25W vs 18.5W), same pinout

πŸ“‹ Reference alternative (not in catalog)

TNY274GN

βœ… Drop-In
πŸ“¦ SMD-8C
Lower output power (8.5W vs 18.5W), same pinout

πŸ“‹ 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 -40Β°C to +150Β°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

Electronic Component Package Diagram Default generic electronic component package diagram 1 2 3 Package
Pin 1 BP/M β€” Bypass pin for internal supply, also used for current limit selection
Pin 2 SOURCE β€” Source of internal MOSFET
Pin 3 SOURCE β€” Source of internal MOSFET
Pin 4 SOURCE β€” Source of internal MOSFET
Pin 5 FEEDBACK β€” Feedback pin for ON/OFF control
Pin 6 EN/UV β€” Enable/Under-voltage pin
Pin 7 DRAIN β€” Drain of internal MOSFET
Pin 8 DRAIN β€” Drain of internal MOSFET

Safe Operating Area (SOA) & Thermal Characteristics

Safe Operating Area Chart Default safe operating area chart for TNY277GN Drain-to-Source Voltage (Vds) Drain Current (Id)

No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.

Typical Applications

TNY277GN is suitable for 6 applications: AC-DC Adapters, Battery Chargers, Standby Power Supplies, Auxiliary Power Supplies, LED Lighting, Home Appliances.

πŸ”Œ

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

TNY278GN (Higher power alternative) TNY276GN (Lower power alternative)
πŸ”‹

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

TNY278GN (Higher power alternative) TNY276GN (Lower power alternative)
πŸ“Ί

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

TNY278GN (Higher power alternative) TNY276GN (Lower power alternative)
🏭

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

TNY278GN (Higher power alternative) TNY276GN (Lower power alternative)
πŸ’‘

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

TNY278GN (Higher power alternative) TNY276GN (Lower power alternative)
🏠

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

TNY278GN (Higher power alternative) TNY276GN (Lower power alternative)

Recommended Products Summary

TNY278GN Higher power alternative Used in: AC-DC Adapters, Battery Chargers, Standby Power Supplies, Auxiliary Power Supplies, LED Lighting, Home Appliances TNY276GN Lower power alternative Used in: AC-DC Adapters, Battery Chargers, Standby Power Supplies, Auxiliary Power Supplies, LED Lighting, Home Appliances
What is the output power of TNY277GN?
The TNY277GN delivers up to 18.5 W output power from a universal input of 85-265 VAC, and 23.5 W from 230 VAC. According to the Power Integrations TinySwitch-III datasheet, these ratings are for flyback topologies in open-frame designs. The actual power depends on thermal conditions and transformer design.
What is the switching frequency of TNY277GN?
The TNY277GN operates at a fixed switching frequency of 132 kHz. This high frequency allows for smaller transformer and output capacitor sizes, reducing the overall power supply footprint. The datasheet specifies this frequency with a tolerance of Β±5%.
What is the package type of TNY277GN?
The TNY277GN comes in an SMD-8C package, which is a surface-mount package with 8 pins. This package is designed for compact, low-profile power supply designs. The SMD-8C package is also used in other TinySwitch-III family members, allowing for easy PCB layout reuse.
What is the input voltage range of TNY277GN?
The TNY277GN accepts an input voltage range of 85 VAC to 265 VAC, making it suitable for universal input applications worldwide. This wide range allows the same design to be used in regions with different mains voltages, simplifying inventory and compliance.
Does TNY277GN have thermal shutdown?
Yes, the TNY277GN includes built-in thermal shutdown circuitry. If the junction temperature exceeds the safe limit, the device shuts down to prevent damage. This feature enhances reliability and protects the power supply in overtemperature conditions.
What is the standby power consumption of TNY277GN?
The TNY277GN achieves very low standby power, typically less than 50 mW at 230 VAC. This is achieved through the EcoSmart technology, which reduces power consumption in light-load and no-load conditions. This makes the device suitable for energy-efficient designs that meet Energy Star requirements.
Can TNY277GN be used in battery chargers?
Yes, the TNY277GN is well-suited for battery chargers. Its 18.5 W output power and universal input range make it ideal for charging applications such as mobile phone chargers and small appliance chargers. The ON/OFF control scheme simplifies the design and reduces component count.
What is the difference between TNY277GN and TNY278GN?
The TNY277GN and TNY278GN are both from the TinySwitch-III family, but the TNY278GN offers higher output power. Specifically, the TNY278GN can deliver up to 21.5 W from 85-265 VAC, compared to 18.5 W for the TNY277GN. Both share the same SMD-8C package and pinout, making them drop-in replacements with different power ratings.
Is TNY277GN RoHS compliant?
Yes, the TNY277GN is RoHS compliant. Power Integrations manufactures this device to meet the Restriction of Hazardous Substances directive, ensuring it is free from lead, mercury, cadmium, and other restricted substances. This makes it suitable for use in products sold in the European Union and other regions with RoHS regulations.
What is the price of TNY277GN?
As of 2026-08-21, the TNY277GN is priced at approximately $1.25 per unit for single quantities, with volume pricing dropping to around $0.75 per unit at 1000 pieces. Prices may vary by distributor and quantity. Check DigiKey or Mouser for current pricing and availability.
Where can I buy TNY277GN?
The TNY277GN is available from major distributors such as DigiKey and Mouser. You can also purchase it directly from Power Integrations or authorized distributors. As of 2026-08-21, DigiKey lists it as in stock and ships the same day. Check the distributor websites for the latest inventory and pricing.
What is the lead time for TNY277GN?
The lead time for TNY277GN is typically 2-4 weeks from major distributors like DigiKey and Mouser, depending on stock levels. For large volume orders, it may be longer. As of 2026-08-21, DigiKey shows it as in stock, so immediate shipment is possible for small quantities.
Can TNY277GN be replaced by TNY277PN?
The TNY277PN is a through-hole version of the same TinySwitch-III device, but it uses a DIP-8 package instead of the SMD-8C. Therefore, it is not a drop-in replacement for the TNY277GN because the package and pinout differ. You would need to redesign the PCB to use the TNY277PN.
What is the best drop-in replacement for TNY277GN?
The best drop-in replacement for TNY277GN is the TNY278GN, which is pin-compatible and shares the same SMD-8C package. The TNY278GN offers higher output power (21.5 W vs 18.5 W) and is a direct substitute. Other TinySwitch-III family members like TNY276GN are also pin-compatible but have lower power ratings.
Where can I download the TNY277GN datasheet PDF?
You can download the TNY277GN datasheet PDF from the Power Integrations website at https://www.power.com/sites/default/files/product-docs/tny274-280.pdf. The datasheet covers the entire TinySwitch-III family, including pinout, specifications, and application circuits.

Engineering reference data for TNY277GN β€” comparison, design guidance, and compliance information.

Selection Guide

Choose the TNY277GN when you need a balance between output power (18.5W) and low standby power for applications like adapters, chargers, and standby supplies. If you need higher power, consider the TNY278GN (21.5W) or TNY279GN (25W). For lower power requirements, the TNY276GN (15W) or TNY275GN (11.5W) may be more cost-effective. All these parts are pin-compatible and share the same SMD-8C package, allowing easy design changes without PCB redesign.

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 Β΅F 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
REACH
Compliant
AEC-Q100
Not Applicable
Lead Free
Yes
Halogen Free
Unknown
Conflict Minerals
Compliant

RoHS compliant per Power Integrations. Not AEC-Q100 qualified as it is not an automotive-grade part.

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