Power Integrations

TNY277PG - 23.5W Offline Switcher IC | Power Integrations

Name: TNY277PG
Brand: Power Integrations
Price: 0.75 USD
Availability: InStock

MPN: TNY277PG ✓ Active

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700 V Vdss User selectable Id 8-PDIP-C (7 leads) Package 132 kHz Speed

From $0.75 USD / Unit

MOQ: 1 |

Price updated: 2026-08-21

Volume Pricing

Qty	Unit Price	Extended
1	$1.29	$1.29
10	$1.15	$11.50
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

Quantity

Drop-in alternatives for TNY277PG — 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:

TNY277P

✅ Drop-In

📦 8-PDIP-C

Same package and pinout, no G suffix (same die)

📋 Reference alternative (not in catalog)

TNY276PG

✅ Drop-In

📦 8-PDIP-C

Lower output power (19 W at 230 VAC), same package and pinout

📋 Reference alternative (not in catalog)

TNY278PG

✅ Drop-In

📦 8-PDIP-C

Higher output power (28 W at 230 VAC), same package and pinout

📋 Reference alternative (not in catalog)

TNY280PG

✅ Drop-In

📦 8-PDIP-C

Higher output power (36.5 W at 230 VAC), same package and pinout

📋 Reference alternative (not in catalog)

ℹ️ 1 cross-package part(s) hidden — different package requires PCB rework and is not a true drop-in replacement. Contact us if you need cross-package suggestions.

TNY277PG Maximum Ratings & Electrical Characteristics

Output Power (230 VAC)	23.5 W
Output Power (85-265 VAC)	18 W
Switching Frequency	132 kHz
MOSFET Breakdown Voltage	700 V
Package	8-PDIP-C (7 leads)
Mounting Type	Through Hole
Topology	Flyback
Control Scheme	ON/OFF
Current Limit	User selectable
Thermal Shutdown	Yes
Auto-Restart Protection	Yes
Frequency Jittering	Yes
Operating Temperature Range	-40C to +150C (junction)
RoHS Status	Compliant
Lead-Free	Yes

TNY277PG Pin Configuration

Pin 1	BP/M — Bypass pin for internal supply, also multifunction for current limit selection
Pin 2	EN/UV — Enable/Undervoltage pin, used for ON/OFF control and line sensing
Pin 3	DRAIN — MOSFET drain connection, connected to transformer primary
Pin 4	DRAIN — MOSFET drain connection (dual pins for thermal and current handling)
Pin 5	DRAIN — MOSFET drain connection (dual pins for thermal and current handling)
Pin 6	DRAIN — MOSFET drain connection (dual pins for thermal and current handling)
Pin 7	SOURCE — MOSFET source connection, connected to primary ground
Pin 8	NC — No connection (pin removed in 7-lead package)

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

TNY277PG is suitable for 6 applications: AC-DC Adapters, Battery Chargers, Standby Power Supplies, Industrial Power Supplies, LED Lighting Drivers, Home Appliances.

⚡

AC-DC Adapters

The TNY277PG is ideal for AC-DC adapters up to 23.5 W, such as those used for laptops, printers, and consumer electronics. Its 700 V MOSFET and 132 kHz switching frequency enable compact transformer design, while the ON/OFF control provides high efficiency across load conditions. The wide input range (85-265 VAC) ensures global compatibility. Designers can achieve low standby power, meeting energy-efficiency regulations like Energy Star. The integrated protection features (thermal shutdown, auto-restart) enhance reliability in consumer applications.

Recommended

TNY277PN · Power Integrations TNY278PG (Higher power alternative for larger adapters)

🔋

Battery Chargers

For battery chargers, the TNY277PG provides a cost-effective solution with its integrated 700 V MOSFET and selectable current limit, allowing designers to tailor the output for different battery chemistries. The 132 kHz switching frequency reduces transformer size, making chargers compact and portable. The ON/OFF control ensures high efficiency during trickle charging, reducing heat dissipation. The device's auto-restart protection safeguards against output short-circuits, which is critical for charger safety. With 18 W universal input capability, it suits chargers for power tools, e-bikes, and small appliances.

Recommended

TNY277PN · Power Integrations TNY276PG (Lower power alternative for small chargers)

📺

Standby Power Supplies

The TNY277PG excels in standby power supplies for TVs, monitors, and home appliances, where low standby power is crucial. Its ON/OFF control minimizes switching losses at light loads, achieving <100 mW standby power. The integrated high-voltage MOSFET and frequency jittering reduce EMI, simplifying filter design. The 700 V rating provides ample margin for line surges. With 23.5 W capability, it can power auxiliary functions like microcontrollers and sensors. The through-hole package is easy to assemble in low-cost power boards.

Recommended

TNY277PN · Power Integrations TNY280PG (Higher power for larger standby loads)

🏭

Industrial Power Supplies

In industrial settings, the TNY277PG provides a rugged solution for auxiliary power supplies in PLCs, motor drives, and sensors. Its 700 V MOSFET handles wide input variations and transients common in industrial environments. The thermal shutdown and auto-restart protection ensure reliable operation under fault conditions. The 132 kHz switching frequency allows for small transformers, saving board space in DIN-rail modules. The through-hole package is robust for vibration-prone applications. With 18 W universal input, it can power control logic, relays, and communication interfaces.

Recommended

TNY277PN · Power Integrations TNY278PG (Higher power for additional I/O loads)

💡

LED Lighting Drivers

The TNY277PG can be used in LED lighting drivers up to 23.5 W, providing constant voltage or constant current output with minimal external components. Its high efficiency reduces heat in enclosed luminaires, extending LED life. The selectable current limit allows optimization for different LED configurations. The 700 V MOSFET is suitable for 230 VAC mains, and the frequency jittering helps meet EMI standards for lighting. The device's protection features prevent damage from LED failures. The through-hole package is suitable for retrofit LED bulbs and drivers.

Recommended

TNY277PN · Power Integrations TNY276PG (Lower power for small LED modules)

🏠

Home Appliances

The TNY277PG is well-suited for power supplies in home appliances like washing machines, refrigerators, and air conditioners, where reliability and efficiency are paramount. Its wide input range accommodates global voltage variations, and the integrated protections handle load transients from motors and compressors. The low standby power helps appliances meet energy-efficiency standards. The 132 kHz switching frequency reduces transformer size, enabling compact power boards. The through-hole package is cost-effective for high-volume appliance manufacturing. With 23.5 W capability, it can power control boards, displays, and sensors.

Recommended

TNY277PN · Power Integrations TNY280PG (Higher power for appliances with more features)

Recommended Products Summary

TNY277PN Power Integrations Used in: AC-DC Adapters, Battery Chargers, Standby Power Supplies, Industrial Power Supplies, LED Lighting Drivers, Home Appliances TNY278PG Higher power alternative for larger adapters Used in: AC-DC Adapters, Industrial Power Supplies TNY276PG Lower power alternative for small chargers Used in: Battery Chargers, LED Lighting Drivers TNY280PG Higher power for larger standby loads Used in: Standby Power Supplies, Home Appliances

What is the output power of TNY277PG?

The TNY277PG delivers up to 23.5 W at 230 VAC input and 18 W at 85-265 VAC universal input. 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 price of TNY277PG?

As of 2026-08-21, the TNY277PG is priced at approximately $1.29 for single-unit quantities, with volume pricing dropping to around $0.75 at 1000 units. Prices vary by distributor; LCSC lists it at $1.2935, and DigiKey and Mouser offer similar pricing. Check current stock and lead times before ordering.

Where can I buy TNY277PG online?

The TNY277PG is available from major distributors including DigiKey, Mouser, LCSC, and Win Source. DigiKey lists it as 'ships today' with stock available. LCSC offers it at $1.2935. For bulk orders, Micro-Semiconductor.com shows 77,591 units in stock. Always verify availability and lead times on the distributor's website.

What is the lead time for TNY277PG?

The lead time for TNY277PG varies by distributor and order quantity. DigiKey typically ships within 24 hours for in-stock items. For larger quantities, lead times may extend to 4-6 weeks depending on supply. As of 2026-08-21, stock is available at major distributors, so immediate shipment is likely for small orders.

Is TNY277PG in stock?

Yes, the TNY277PG is in stock at multiple distributors as of 2026-08-21. DigiKey shows it as 'ships today', LCSC has it in stock, and Micro-Semiconductor.com reports 77,591 units available. Mouser also lists it with inventory. Check the specific distributor's website for real-time stock levels.

TNY277PG vs TNY277PN - which is better for a 12V 2A adapter?

The TNY277PG and TNY277PN are functionally identical in electrical specifications, both delivering 23.5 W at 230 VAC. The difference is packaging: TNY277PG is in an 8-PDIP-C (through-hole) package, while TNY277PN is in an 8-SMD (surface-mount) package. For a 12V 2A adapter, either works, but choose PG for through-hole assembly or PN for SMD. Both are drop-in replacements in terms of pinout.

What is the difference between TNY277PG and TNY277PN?

The TNY277PG and TNY277PN are electrically identical, but differ in package type. TNY277PG uses an 8-PDIP-C (through-hole, 7 leads) package, while TNY277PN uses an 8-SMD (surface-mount) package. Both have the same pinout and power ratings. Choose based on your PCB assembly process: through-hole for manual or wave soldering, SMD for reflow.

When should I choose TNY277PG over TNY277PN?

Choose TNY277PG when you need a through-hole package for easier prototyping, manual assembly, or wave soldering. It is also preferred for high-vibration environments where through-hole solder joints are more robust. Choose TNY277PN if you are using automated SMD assembly for high-volume production, as it reduces board space and assembly cost.

What is the best drop-in replacement for TNY277PG?

The best drop-in replacement for TNY277PG is the TNY277PN, which is electrically identical but in an SMD package. For a through-hole replacement, the TNY277P (without the G suffix) is also pin-compatible. Other TinySwitch-III family members like TNY276PG or TNY278PG may be drop-in if power requirements differ, but verify pinout and current limit settings.

Can TNY277PN replace TNY277PG?

Yes, the TNY277PN can replace TNY277PG as it is electrically identical and pin-compatible. The only difference is the package: TNY277PN is surface-mount (8-SMD) while TNY277PG is through-hole (8-PDIP-C). If your PCB is designed for through-hole, you cannot directly use the SMD version without a footprint change. For new designs, choose the package that matches your assembly process.

Where can I download the TNY277PG datasheet PDF?

The TNY277PG datasheet is available from Power Integrations' official website and distributor sites. The official TinySwitch-III family datasheet can be downloaded from power.com. Alldatasheet.com also hosts a PDF version. The datasheet includes full specifications, pinout, and application circuits.

Where can I find the TNY277PG pinout?

The TNY277PG pinout is detailed in the TinySwitch-III datasheet. The 8-pin PDIP-C package has 7 leads, with pin 8 removed. Pin functions include BP/M (bypass/multifunction), EN/UV (enable/undervoltage), and DRAIN. Refer to the datasheet's pin configuration section for exact pin assignments and descriptions.

Hey Google, what can replace TNY277PG?

The TNY277PG can be replaced by the TNY277PN (SMD version) or TNY277P (through-hole, same package). Other TinySwitch-III family members like TNY276PG (lower power) or TNY278PG (higher power) may be suitable if your power requirements differ. Always verify pin compatibility and current limit settings before substitution.

Is TNY277PG the same as TNY277PN?

No, the TNY277PG and TNY277PN are not the same part number, but they are electrically identical. The difference is packaging: TNY277PG is through-hole (8-PDIP-C) and TNY277PN is surface-mount (8-SMD). Both have the same pinout and power ratings, so they are functionally equivalent but not physically interchangeable without a PCB footprint change.

What are the key specifications of TNY277PG that engineers should know?

The TNY277PG is an offline switcher IC with a 700 V MOSFET, 132 kHz switching frequency, and output power of 23.5 W at 230 VAC or 18 W at 85-265 VAC. It uses ON/OFF control, has user-selectable current limit, thermal shutdown, and auto-restart protection. The package is 8-PDIP-C (7 leads). These specs make it suitable for compact, efficient flyback power supplies.

What is the best Power Integrations equivalent for TNY277PG?

The best Power Integrations equivalent for TNY277PG is the TNY277PN, which is the SMD version with identical electrical specs. For through-hole, the TNY277P is also equivalent. If you need higher power, consider TNY278PG (28 W at 230 VAC); for lower power, TNY276PG (19 W at 230 VAC). All are pin-compatible within the TinySwitch-III family.

Engineering reference data for TNY277PG — comparison, design guidance, and compliance information.

Selection Guide

Choose the TNY277PG when you need a through-hole offline switcher for applications up to 23.5 W at 230 VAC or 18 W at universal input. It is ideal for AC-DC adapters, chargers, and standby supplies where low cost and simplicity are key. If you prefer surface-mount assembly, select the TNY277PN, which is electrically identical. For lower power requirements (up to 19 W), the TNY276PG is a cost-effective alternative. For higher power (up to 28 W), consider the TNY278PG, and for up to 36.5 W, the TNY280PG. All these alternatives are pin-compatible in the same package, allowing easy scaling without PCB redesign. The TNY277P is a direct equivalent with the same package and pinout. Evaluate your power needs and assembly process to choose the best fit.

Comparison with Alternatives

Parameter	This Product	TNY277PN	TNY277P	TNY276PG	TNY278PG	TNY280PG
Package	8-PDIP-C (7 leads)	8-SMD	8-PDIP-C (7 leads)	8-PDIP-C (7 leads)	8-PDIP-C (7 leads)	8-PDIP-C (7 leads)
Brand	Power Integrations	Power Integrations	Power Integrations	Power Integrations	Power Integrations	Power Integrations
Output Power (230 VAC)	23.5 W	23.5 W	23.5 W	19 W	28 W	36.5 W
Output Power (85-265 VAC)	18 W	18 W	18 W	15 W	21.5 W	28 W
Switching Frequency	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
Control Scheme	ON/OFF	ON/OFF	ON/OFF	ON/OFF	ON/OFF	ON/OFF
Current Limit	User selectable	User selectable	User selectable	User selectable	User selectable	User selectable

Key Differentiators

Integrated 700 V MOSFET (vs TNY276PG)
Higher output power than TNY276PG (vs TNY276PG)
Through-hole package for easy assembly (vs TNY277PN)

Design Notes

The TNY277PG in an 8-PDIP-C package has a thermal resistance of approximately 80 C/W (junction-to-ambient) without a heatsink. At 23.5 W output, the power dissipation can reach 2-3 W, causing a temperature rise of 160-240C. For reliable operation, ensure adequate copper area on the PCB for heat spreading, or use a heatsink. In enclosed designs, derate the output power accordingly.

For optimal EMI performance, place the TNY277PG close to the transformer and keep the primary-side loop (input capacitor, transformer primary, MOSFET drain) as small as possible. Use a single-point ground for the source pin and the input capacitor. Add a Y-capacitor between primary and secondary grounds to reduce common-mode noise. Follow the layout guidelines in the TinySwitch-III datasheet.

Do not exceed the absolute maximum drain voltage of 700 V. Ensure the transformer's leakage inductance is minimized to avoid voltage spikes. The BP/M pin capacitor value sets the current limit; use the recommended value (typically 0.1 uF for standard, 1 uF for reduced). Incorrect capacitor values can cause false triggering or reduced output power. Also, ensure the EN/UV pin is properly connected for undervoltage lockout.