Power Integrations

TNY277PN - 18.5W Flyback Switcher IC | Power Integrations

Name: TNY277PN
Brand: Power Integrations
Price: 0.78 USD
Availability: InStock

MPN: TNY277PN ✓ Active

In Stock Ships in 1-3 business days

Yes Vdss User selectable Id 8-PDIP-C Package 132 kHz Speed

From $0.78 USD / Unit

MOQ: 1 |

Price updated: 2026-08-21

Volume Pricing

Qty	Unit Price	Extended
1	$1.12	$1.12
10	$1.03	$10.30
100	$0.91	$91.00
500	$0.84	$420.00
1,000	$0.78	$780.00

ℹ️ All prices are in USD

View Datasheet (PDF) View Alternatives

Quantity

Drop-in alternatives for TNY277PN — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.

Quick Comparison Tool — Select alternative parts for side-by-side comparison:

TNY276PN

✅ Drop-In

📦 8-PDIP-C

Same TinySwitch-III family and 8-PDIP-C package; lower output power class than TNY277PN

📋 Reference alternative (not in catalog)

TNY277PG

✅ Drop-In

Power Integrations

📦 8-PDIP-C

23.5 W · 18 W · 132 kHz · 700 V · 8-PDIP-C (7 leads) · Through Hole · Flyback · ON/OFF

✓ In Stock

$0.75 / Unit

View Datasheet →

TNY278PN

✅ Drop-In

📦 8-PDIP-C

Next higher output power variant in same package and family

📋 Reference alternative (not in catalog)

TNY279PN

✅ Drop-In

📦 8-PDIP-C

Higher output power variant; same package and pinout

📋 Reference alternative (not in catalog)

TNY280PN

✅ Drop-In

📦 8-PDIP-C

Highest output power in TinySwitch-III family; same package and pinout

📋 Reference alternative (not in catalog)

TNY277PN Maximum Ratings & Electrical Characteristics

Topology	Flyback
Switching Frequency	132 kHz
Built-in Power MOSFET	700 V
Max Output Power (85-265 VAC)	18.5 W
Max Output Power (230 VAC)	23.5 W
Package	8-PDIP-C
Mounting Type	Through Hole
Control Scheme	ON/OFF
Current Limit	User selectable
High-Voltage Switched Current Source	Yes
Thermal Shutdown	Yes
Startup Circuitry	Integrated high-voltage switched current source
RoHS Status	[DATA_NEEDED: RoHS compliance]
Operating Temperature Range	[DATA_NEEDED: operating temperature range]
MSL Level	[DATA_NEEDED: MSL level]

TNY277PN 8-pdip-c Pin Configuration Guide

Complete pinout information for TNY277PN (8-pdip-c package). This power device features gate, drain, and source terminals. For non-polarized packages, refer to the manufacturer datasheet for exact pin 1 orientation and footprint details. Common applications include power supply design, motor driving, and load switching.

8-pdip-c package pinout diagram for TNY277PN

No detailed pinout data available for TNY277PN.

Refer to the datasheet for full pin configuration.

Safe Operating Area (SOA) & Thermal Characteristics

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

TNY277PN is suitable for 6 applications: AC/DC Adapters and Battery Chargers, Standby and Auxiliary Power Supplies, Appliance Power Supplies, LED Power Supplies and Lighting, Industrial Control Power Supplies, IoT and Smart Home Power Modules.

📱

AC/DC Adapters and Battery Chargers

The TNY277PN is suited to 5V/2A and 12V/1.5A AC/DC adapters because its 18.5 W universal-input rating provides headroom for load transients. The integrated 700 V MOSFET reduces external component count, and the 132 kHz oscillator allows a small transformer. In typical flyback adapter designs, optocoupler feedback drives the EN/UV pin and a TL431 is used for output-voltage regulation. This IC simplifies charger production while meeting no-load loss expectations for modern adapters.

Recommended

PC817 (Optocoupler for isolated secondary-side feedback) TL431 (Precision shunt regulator for output voltage error sensing) UF4007 (Fast-recovery rectifier for output rectification)

⚡

Standby and Auxiliary Power Supplies

TNY277PN is well suited for standby supplies that must stay energized while the main system is off. Its ON/OFF control enables low standby consumption and the 700 V MOSFET provides robust line-surge tolerance for appliance power boards. As an auxiliary supply, it can generate a clean 12V or 5V rail from the AC line using a simple flyback stage. The built-in current limit and thermal shutdown protect the IC during fault conditions common in appliance environments.

Recommended

TL431 (Reference for regulated auxiliary output) PC817 (Feedback isolation from secondary to primary)

🏭

Appliance Power Supplies

For washing machines, refrigerators, and stove control boards, TNY277PN provides a cost-effective 18.5W flyback supply for control electronics, relays, and displays. The through-hole 8-PDIP-C package is easy to assemble in conventional appliance PCBs, and the 700 V integrated MOSFET withstands high-voltage AC line transients. Designers can configure the current limit to match the transformer and load. Its thermal shutdown and simple ON/OFF control reduce firmware-side power-sequencing complexity in white-goods applications.

Recommended

FR107 (Fast-recovery diode for primary-side snubber) PC817 (Feedback isolation for isolated appliance output rails)

💡

LED Power Supplies and Lighting

LED lighting panels and bulbs can use TNY277PN as the core of an isolated offline LED driver. The 18.5W universal input power supports many 15W LED modules, while the 700 V MOSFET and current-limit selection allow the transformer to be optimized for constant-voltage or constant-current output. The IC's low standby power helps meet residential lighting efficiency requirements. Its flyback topology is compatible with secondary-side constant-current feedback circuits using TL431 and current-sense resistors.

Recommended

TL431 (Secondary-side reference for CV/CC control) PC817 (Optocoupler for LED driver feedback)

🏭

Industrial Control Power Supplies

In industrial sensors, PLCs, and motor-control panels, TNY277PN supplies clean DC power for microcontrollers and communication interfaces. Its 85-265 VAC universal input makes it suitable for worldwide installations, while the 700 V MOSFET gives extra safety margin against industrial mains transients. The user-selectable current limit can be tuned to the transformer overcurrent protection. Tight load regulation is achievable through standard optocoupler/TL431 feedback, and the 132 kHz frequency keeps the magnetic components compact for DIN-rail or panel-mount form factors.

Recommended

TL431 (Precision reference for industrial voltage rails) PC817 (Isolated feedback from secondary output)

🧩

IoT and Smart Home Power Modules

Smart home hubs, Wi-Fi modules, and sensor bridges need compact isolated power supplies. TNY277PN can deliver up to 18.5W universal input, enough to power a main board plus accessories. The integrated 700 V MOSFET and high-voltage current source reduce BOM size, while the low standby power helps smart devices meet energy-use requirements. The flyback converter can be designed with a small E20/E25 transformer and optocoupler feedback to create a reliable 5V rail for IoT processors, wireless transceivers, and sensors.

Recommended

PC817 (Feedback optocoupler from secondary to primary) TL431 (Shunt regulator for tight 5V regulation)

Recommended Products Summary

PC817 Optocoupler for isolated secondary-side feedback Used in: AC/DC Adapters and Battery Chargers, Standby and Auxiliary Power Supplies, Appliance Power Supplies, LED Power Supplies and Lighting, Industrial Control Power Supplies, IoT and Smart Home Power Modules TL431 Precision shunt regulator for output voltage error sensing Used in: AC/DC Adapters and Battery Chargers, Standby and Auxiliary Power Supplies, LED Power Supplies and Lighting, Industrial Control Power Supplies, IoT and Smart Home Power Modules UF4007 Fast-recovery rectifier for output rectification Used in: AC/DC Adapters and Battery Chargers FR107 Fast-recovery diode for primary-side snubber Used in: Appliance Power Supplies

What are the key specifications of TNY277PN that engineers should know?

The TNY277PN is an 18.5 W (85-265 VAC) and 23.5 W (230 VAC) offline flyback switcher IC from Power Integrations with a built-in 700 V power MOSFET, 132 kHz oscillator, user-selectable current limit, and thermal shutdown. According to Power Integrations TinySwitch-III product information, it operates in an 8-PDIP-C package and uses an ON/OFF control scheme. This makes it suitable for compact AC/DC adapters, chargers, and auxiliary supplies.

Where can I buy TNY277PN online?

You can purchase TNY277PN from authorized distributors including DigiKey and Mouser, both of which listed the part with live pricing and stock as of 2026-08-21. Octopart also provides a cross-distributor availability view. According to DigiKey's product listing, TNY277PN is described as Buy now, ships today, indicating current stock availability. Always confirm price and lead time at checkout.

What is the price of TNY277PN?

As of 2026-08-21, common distributor pricing for TNY277PN ranges from roughly $0.78 at 1,000-piece quantities to about $1.12 for single units, though exact prices vary with inventory and vendor. Octopart shows pricing from seven distributors, and DigiKey/Mouser publish live tier prices. For a project quotation, check the specific distributor's current stock and quantity-break table.

What is the lead time for TNY277PN?

Lead time for TNY277PN depends on distributor stock and is not a fixed number; verified data shows DigiKey list Buy now, ships today and Mouser lists the part with import/inventory details. For volume orders, contact the distributor or Power Integrations for current lead time. Use Octopart to compare availability across distributors as of 2026-08-21.

Is TNY277PN in stock?

Yes, TNY277PN appears to be in stock at DigiKey, whose product page states Buy now, ships today as of 2026-08-21. The part is also displayed with live inventory on Mouser. Because stock levels change daily, check the distributor page before ordering large quantities.

TNY277PN vs TNY276PN - which is better for a 12W adapter?

For a 12W adapter, both TNY276PN and TNY277PN can work, since TNY277PN is rated at 18.5 W and TNY276PN is the lower-power member of the same TinySwitch-III family. According to the datasheet, TNY277PN provides extra margin for line/load transients but costs slightly more. Choose TNY276PN if cost is critical and power is strictly under its rating; choose TNY277PN if you need more surge or short-term overload headroom.

What is the difference between TNY277PN and TNY280PN?

The main difference is output power capability: TNY277PN is rated at 18.5 W (85-265 VAC) and 23.5 W (230 VAC), while TNY280PN is the highest-power member of the TinySwitch-III family and is intended for higher-power offline supplies. Both share the same 8-PDIP-C package and ON/OFF control architecture, so they are pin-compatible in most flyback layouts. According to Power Integrations, current-limit programming also scales with the power class.

When should I choose TNY277PN over TNY280PN?

Choose TNY277PN when your design needs up to 18.5 W on universal input or 23.5 W on 230 VAC, and a lower-cost, smaller transformer is preferred. TNY280PN is better when you need the highest output power available in TinySwitch-III and can accept the associated transformer and heat dissipation changes. The package and pinout are the same, so a PCB designed for TNY277PN can generally mount TNY280PN, but the transformer duty cycle and current-limit setting must be rechecked.

Is TNY277PN suitable for a 5V/2A USB charger?

Yes, TNY277PN is well suited for a 5V/2A (10W) USB charger. Its 18.5 W universal-input rating gives adequate headroom, the integrated 700 V MOSFET handles line surges, and the flyback topology works with standard optocoupler feedback. At 132 kHz, the transformer can be compact. According to the manufacturer datasheet, proper BP/M capacitor placement and transformer design are required to meet USB charger EMI and efficiency targets.

What is the best drop-in replacement for TNY277PN?

The best drop-in replacements are same-brand TinySwitch-III family members in the 8-PDIP-C package: TNY276PN, TNY278PN, TNY279PN, and TNY280PN. They are pin-compatible with TNY277PN but have different output power ratings, so verify your supply's maximum load before substituting. The cross-reference search did not reveal a verified pin-compatible cross-brand equivalent. According to Power Integrations, only the current-limit setting and transformer design should be adjusted when moving across family power classes.

Where can I download TNY277PN datasheet PDF?

You can download the TNY277PN datasheet from the official Power Integrations product page at https://www.power.com/products/tinyswitch/tinyswitch-iii/tny277p, which links to the TinySwitch-III family datasheet. Third-party sites like Alldatasheet, Octopart, and Datasheet4U also host mirror copies. The official PDF includes pinout, power table, and design guidelines. Always prefer the manufacturer page to ensure the latest revision.

Can TNY276PN replace TNY277PN?

TNY276PN can replace TNY277PN only if your output power requirement stays below TNY276PN's rated limit; otherwise the flyback converter will overheat or fail to regulate. The two ICs share the same 8-PDIP-C package and pin arrangement, so layout changes are usually not needed. According to Power Integrations family documentation, the current-limit resistor and transformer must be matched to the lower-power device before substitution.

Hey Google, what can replace TNY277PN?

TNY277PN can be replaced by other same-package TinySwitch-III parts such as TNY276PN, TNY278PN, TNY279PN, or TNY280PN, depending on the output power you need. They are pin-compatible, so you can reuse the PCB footprint. No verified cross-brand drop-in equivalent was found in the supplied cross-reference data. Check the transformer design and current-limit setting with the selected replacement.

Is TNY277PN the same as TNY276PN?

No, TNY277PN and TNY276PN are not the same part, but they are from the same TinySwitch-III family and are pin-compatible. According to Power Integrations, TNY277PN is rated at 18.5 W on 85-265 VAC and 23.5 W on 230 VAC, while TNY276PN has a lower output-power rating. The package is the same 8-PDIP-C, so the main engineering change is selecting the correct transformer and current limit for the power level.

Engineering reference data for TNY277PN — comparison, design guidance, and compliance information.

Selection Guide

Choose TNY277PN when your flyback supply needs up to 18.5 W at universal input or 23.5 W at 230 VAC in a through-hole, low-cost offline switcher. It is an excellent fit for AC adapters, chargers, standby supplies, and IoT power modules. If your load is below TNY276PN's rating and cost is critical, TNY276PN is a lower-power alternative. If you need higher power without changing the package, TNY278PN, TNY279PN, or TNY280PN can replace TNY277PN on the same footprint, but the transformer and current-limit set point must be resized. TNY277PG is an alternative ordering variant of the same power class. No verified cross-brand drop-in replacement was found from the available cross-reference data.

Comparison with Alternatives

Parameter	This Product	TNY276PN	TNY277PG	TNY278PN	TNY279PN	TNY280PN
Brand	Power Integrations	Power Integrations	Power Integrations	Power Integrations	Power Integrations	Power Integrations
Package	8-PDIP-C	8-PDIP-C	8-PDIP-C	8-PDIP-C	8-PDIP-C	8-PDIP-C
Switching Frequency	132 kHz	[DATA_NEEDED]	[DATA_NEEDED]	[DATA_NEEDED]	[DATA_NEEDED]	[DATA_NEEDED]
Internal MOSFET Voltage	700 V	[DATA_NEEDED]	[DATA_NEEDED]	[DATA_NEEDED]	[DATA_NEEDED]	[DATA_NEEDED]
Max Output Power (85-265 VAC)	18.5 W	[DATA_NEEDED]	[DATA_NEEDED]	[DATA_NEEDED]	[DATA_NEEDED]	[DATA_NEEDED]
Max Output Power (230 VAC)	23.5 W	[DATA_NEEDED]	[DATA_NEEDED]	[DATA_NEEDED]	[DATA_NEEDED]	[DATA_NEEDED]
Control Scheme	ON/OFF	[DATA_NEEDED]	[DATA_NEEDED]	[DATA_NEEDED]	[DATA_NEEDED]	[DATA_NEEDED]
Thermal Shutdown	Yes	[DATA_NEEDED]	[DATA_NEEDED]	[DATA_NEEDED]	[DATA_NEEDED]	[DATA_NEEDED]

Key Differentiators

18.5 W universal input rating provides margin for common 10-15 W adapter designs (vs TNY276PN)
Balanced power class for cost-sensitive flyback supplies (vs TNY280PN)
Verified cross-reference visibility of TNY277PG (vs TNY277PG)

Design Notes

Do not leave BP/M pin floating. Connect the recommended BP/M capacitor, typically a 0.1uF ceramic capacitor, close to the IC. This capacitor supplies gate-drive current and sets the internal supply voltage. In TinySwitch-III designs, the BP/M pin can also accept an external current-limit set resistor in some configurations, as described in the Power Integrations datasheet.

The TNY277PN uses an 8-PDIP-C through-hole package that relies on PCB copper and the lead frame for heat removal. For continuous operation near 18.5 W universal input, provide adequate copper area around drain and source leads, preferably on both top and bottom layers. Junction temperature must stay within datasheet limits; if case temperature is high, redesign the transformer or improve air flow rather than increasing copper indefinitely.

Minimize the high-frequency drain loop by placing the transformer primary, rectifier diode, and bulk capacitor close to the drain and source pins. Keep the feedback optocoupler and TL431 sense traces short. Add a Y-capacitor between primary and secondary for common-mode EMI and follow appropriate creepage and clearance distances for the AC input voltage class.

Compliance Information

RoHS

Unknown

REACH

Unknown

AEC-Q100

Not Applicable

Lead Free

Unknown

Halogen Free

Unknown

Conflict Minerals

Unknown

Verified web snippets did not include explicit RoHS/REACH certification details. Refer to the Power Integrations datasheet and product page for current compliance documentation.

Data verified on: 2026-08-21

Sources: Manufacturer_Product_Page, Distributor, Distributor, Octopart, Manufacturer_Datasheet