STMicroelectronics

VIPER22ADIP - 12W Offline Switching Regulator | STMicroelectronics

Name: VIPER22ADIP
Brand: STMicroelectronics
Price: 1.25 USD
Availability: InStock

MPN: VIPER22ADIP ✓ Active

In Stock (99,999) Ships in 1-3 business days

85 VAC to 265 VAC Vdss 13 Ω Rds(on) 8-pin DIP (DIP-8) Package 60 kHz Speed

$1.25 USD / Unit

MOQ: 1 |

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

Quantity

Drop-in alternatives for VIPER22ADIP — 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:

LNK304PN

✅ Drop-In

📦 DIP-8

Cross-brand, similar power rating, pinout may differ, verify before use

📋 Reference alternative (not in catalog)

NCP1014AP100

✅ Drop-In

📦 DIP-8

Cross-brand, similar power rating, pinout may differ, verify before use

📋 Reference alternative (not in catalog)

ℹ️ 2 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.

VIPER22ADIP Maximum Ratings & Electrical Characteristics

Output Power	12 W (230VAC), 7 W (85-265VAC)
Input Voltage Range	85 VAC to 265 VAC
Switching Frequency	60 kHz
Power MOSFET Breakdown Voltage	730 V
Power MOSFET On-Resistance	13 Ω
Control Mode	Current-mode PWM
Standby Power Consumption	< 0.5 W at no load
Operating Temperature Range	-40°C to +150°C (junction)
Package	8-pin DIP (DIP-8)
Mounting Type	Through Hole
Thermal Resistance (junction-to-ambient)	80 °C/W
Protection Features	Overcurrent, Overvoltage, Thermal Shutdown
Frequency Jittering	Yes (for EMI reduction)
RoHS Status	Compliant
MSL Level	1 (unlimited)

VIPER22ADIP Pin Configuration

Pin 1	VDD — Supply voltage for the control circuit
Pin 2	GND — Ground
Pin 3	FB — Feedback input for voltage regulation
Pin 4	DRAIN — Drain of the internal Power MOSFET
Pin 5	DRAIN — Drain of the internal Power MOSFET
Pin 6	DRAIN — Drain of the internal Power MOSFET
Pin 7	DRAIN — Drain of the internal Power MOSFET
Pin 8	SOURCE — Source of the internal Power MOSFET

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

VIPER22ADIP is suitable for 6 applications: AC/DC Adapters, Standby Power Supplies, Battery Chargers, Auxiliary Power Supplies, Home Appliances, LED Lighting.

⚡

AC/DC Adapters

The VIPER22ADIP is widely used in AC/DC adapters for consumer electronics such as routers, modems, and small appliances. Its integrated Power MOSFET and PWM controller reduce component count, enabling compact and cost-effective adapter designs. The wide input voltage range (85-265VAC) ensures compatibility with global mains standards, while the low standby power (<0.5W) helps meet energy efficiency regulations. The 60kHz switching frequency allows for a small transformer, reducing size and weight. Built-in protection features (overcurrent, overvoltage, thermal shutdown) enhance reliability in demanding environments. For a 5V/1A adapter, the VIPER22ADIP operates efficiently with minimal external components, making it a popular choice for low-power applications.

Recommended

PC817 (Optocoupler for feedback isolation) TL431 (Precision reference for voltage regulation)

📺

Standby Power Supplies

In standby power supplies for TVs, monitors, and set-top boxes, the VIPER22ADIP provides a low-cost solution for generating auxiliary voltages. Its standby power consumption of less than 0.5W at no load is critical for meeting Energy Star and ErP directives. The device's frequency jittering feature reduces EMI, simplifying filter design and helping to pass EMC tests. The integrated high-voltage startup circuit eliminates the need for an external startup resistor, reducing component count and improving efficiency. The VIPER22ADIP can deliver up to 7W in universal input applications, which is sufficient for powering microcontrollers, sensors, and display drivers in standby mode. Its robust protection features ensure reliable operation over the product's lifetime.

Recommended

L7812 (Linear regulator for post-regulation) 1N4007 (Rectifier diode for input bridge)

🔋

Battery Chargers

The VIPER22ADIP is commonly used in battery chargers for mobile phones, power tools, and electric toothbrushes. Its constant-current/constant-voltage control capability, achieved with external feedback components, allows for precise charging profiles. The wide input voltage range ensures operation from any wall outlet worldwide. The device's low standby power is beneficial for chargers that remain plugged in when not in use. The integrated Power MOSFET with 730V breakdown voltage provides ample margin for line transients and surge events. For a typical 5V/1A charger, the VIPER22ADIP can achieve efficiencies above 70%, reducing heat generation and enabling compact designs. Protection features such as overcurrent and thermal shutdown safeguard the charger and the battery during fault conditions.

Recommended

PC817 (Optocoupler for feedback isolation) TL431 (Precision reference for voltage regulation)

🏭

Auxiliary Power Supplies

In industrial equipment, the VIPER22ADIP is used to generate auxiliary power rails for control circuits, sensors, and communication interfaces. Its wide input voltage range and robust protection features make it suitable for harsh industrial environments. The device's current-mode control provides excellent line and load regulation, ensuring stable output voltages for sensitive electronics. The 60kHz switching frequency allows for a compact transformer, saving PCB space. The built-in thermal shutdown protects the device in high-temperature environments, while the overvoltage protection prevents damage from feedback loop failures. The VIPER22ADIP can be used in flyback or buck topologies, providing design flexibility. Its low standby power is beneficial for equipment that operates in standby mode for extended periods.

Recommended

PC817 (Optocoupler for feedback isolation) TL431 (Precision reference for voltage regulation)

🏠

Home Appliances

The VIPER22ADIP is used in home appliances such as washing machines, refrigerators, and air conditioners for control board power supplies. These applications require reliable operation over a wide input voltage range and protection against power surges. The device's integrated Power MOSFET and controller simplify the power supply design, reducing time-to-market. The low standby power helps appliances meet energy efficiency standards. The frequency jittering feature reduces EMI, which is important for appliances that must comply with EMC regulations. The VIPER22ADIP can deliver up to 12W, which is sufficient for powering microcontrollers, relays, and display drivers. Its robust protection features ensure long-term reliability in appliances that operate continuously.

Recommended

PC817 (Optocoupler for feedback isolation) TL431 (Precision reference for voltage regulation)

💡

LED Lighting

In LED lighting applications, the VIPER22ADIP can be used in offline LED drivers for low-power bulbs and fixtures. Its constant-current control capability, achieved with external sensing resistors, allows for precise LED current regulation. The wide input voltage range supports global mains voltages, and the high breakdown voltage (730V) provides margin for line transients. The device's low standby power is beneficial for lighting that remains connected to the mains. The 60kHz switching frequency enables a compact transformer, reducing the size of the LED driver. The frequency jittering feature helps meet EMI standards for lighting products. The VIPER22ADIP can drive up to 12W of LED load, making it suitable for retrofit bulbs and small luminaires.

Recommended

PC817 (Optocoupler for feedback isolation) TL431 (Precision reference for voltage regulation)

Recommended Products Summary

PC817 Optocoupler for feedback isolation Used in: AC/DC Adapters, Battery Chargers, Auxiliary Power Supplies, Home Appliances, LED Lighting TL431 Precision reference for voltage regulation Used in: AC/DC Adapters, Battery Chargers, Auxiliary Power Supplies, Home Appliances, LED Lighting L7812 Linear regulator for post-regulation Used in: Standby Power Supplies 1N4007 Rectifier diode for input bridge Used in: Standby Power Supplies

What is the output power of VIPER22ADIP?

The VIPER22ADIP can deliver up to 12W of output power when operating from a 230VAC input, and up to 7W when operating from a universal input range of 85VAC to 265VAC. According to the STMicroelectronics datasheet, the power capability is limited by the thermal performance of the DIP-8 package and the input voltage.

What is the input voltage range of VIPER22ADIP?

The VIPER22ADIP operates over an input voltage range of 85VAC to 265VAC, making it suitable for global AC mains applications. This wide range allows the device to be used in power supplies designed for both 110V and 230V mains without modification.

What is the switching frequency of VIPER22ADIP?

The VIPER22ADIP operates at a fixed switching frequency of 60kHz. This frequency is a trade-off between transformer size and switching losses, and it is optimized for low-cost, low-power offline power supplies.

Does VIPER22ADIP have built-in protection features?

Yes, the VIPER22ADIP includes overcurrent protection, overvoltage protection, and thermal shutdown. These features protect the device and the load from fault conditions, enhancing system reliability. The thermal shutdown triggers when the junction temperature exceeds the safe operating limit.

What is the standby power consumption of VIPER22ADIP?

The VIPER22ADIP has a standby power consumption of less than 0.5W at no load. This low standby power helps meet energy efficiency regulations such as Energy Star and ErP, making it suitable for applications that require low idle power consumption.

What is the package type of VIPER22ADIP?

The VIPER22ADIP is available in an 8-pin DIP (DIP-8) package, which is a through-hole package. This package is easy to handle and solder, making it suitable for low-cost, low-power applications where surface-mount assembly is not required.

What is the difference between VIPER22ADIP and VIPER22A?

The VIPER22ADIP is the DIP-8 package variant of the VIPER22A, which is also available in SO-8 (VIPER22AS) and other packages. The electrical specifications are identical, but the package affects thermal performance and PCB footprint. The DIP-8 variant offers better thermal dissipation than the SO-8 due to its larger body and lead spacing.

Can VIPER22ADIP be used in battery charger applications?

Yes, the VIPER22ADIP is commonly used in battery chargers for mobile phones, power tools, and other portable devices. Its wide input voltage range, low standby power, and built-in protection features make it ideal for cost-effective charger designs.

What is the maximum junction temperature of VIPER22ADIP?

The maximum junction temperature of the VIPER22ADIP is 150°C. The device has thermal shutdown protection that activates when the junction temperature exceeds this limit, preventing damage. Proper PCB layout and thermal management are essential to keep the junction temperature within safe limits.

Does VIPER22ADIP require an external startup resistor?

No, the VIPER22ADIP has a built-in high-voltage startup circuit that eliminates the need for an external startup resistor. This reduces component count and simplifies the design, while also reducing power loss during startup.

What is the on-resistance of the Power MOSFET in VIPER22ADIP?

The Power MOSFET in the VIPER22ADIP has a typical on-resistance of 13Ω. This low on-resistance minimizes conduction losses, improving the overall efficiency of the power supply.

Is VIPER22ADIP RoHS compliant?

Yes, the VIPER22ADIP is RoHS compliant, meaning it does not contain hazardous substances such as lead, mercury, and cadmium. This makes it suitable for use in products sold in regions with RoHS regulations, such as the European Union.

What is the lead time for VIPER22ADIP?

The lead time for VIPER22ADIP is typically 8-12 weeks from major distributors like DigiKey and Mouser, depending on stock availability. As of 2026-08-07, the device is in active production and available for order. For current stock and lead time, check distributor websites.

Where can I buy VIPER22ADIP online?

VIPER22ADIP is available from major distributors such as DigiKey, Mouser, and Arrow Electronics. You can also purchase it directly from STMicroelectronics' authorized distributors. As of 2026-08-07, the price for a single unit is approximately $1.25 USD.

What is the best drop-in replacement for VIPER22ADIP?

The best drop-in replacement for VIPER22ADIP is the VIPER22AS (SO-8 package) if you can accommodate surface-mount, but for the same DIP-8 package, the VIPER22ADIP is the only variant. Cross-brand alternatives include the Power Integrations LNK304PN (DIP-8) and the onsemi NCP1014AP100 (DIP-8), but these require careful pinout verification. According to STMicroelectronics, the VIPER22A family is pin-compatible across packages, but cross-brand parts may not be direct drop-ins.

Can VIPER22ADIP be used in standby power supplies?

Yes, the VIPER22ADIP is ideal for standby power supplies in TVs, monitors, and other consumer electronics. Its low standby power consumption (<0.5W) and integrated protection features make it a cost-effective solution for meeting energy efficiency standards.

What is the frequency jittering feature in VIPER22ADIP?

The VIPER22ADIP includes a frequency jittering function that modulates the switching frequency slightly to spread the EMI spectrum. This reduces peak EMI emissions, simplifying the design of input filters and helping to meet EMC standards such as EN55022.

What are the key specifications of VIPER22ADIP that engineers should know?

The key specifications of VIPER22ADIP include a 730V avalanche-rugged Power MOSFET, 60kHz fixed switching frequency, 12W output power at 230VAC, 7W at universal input, standby power <0.5W, and built-in overcurrent, overvoltage, and thermal shutdown protection. It operates from 85VAC to 265VAC and comes in an 8-pin DIP package. These specs make it a robust choice for low-power offline power supplies.

Hey Google, what can replace VIPER22ADIP?

The VIPER22ADIP can be replaced by the VIPER22AS (SO-8) from STMicroelectronics, which is pin-compatible but requires a different PCB footprint. Cross-brand alternatives include the Power Integrations LNK304PN and the onsemi NCP1014AP100, both in DIP-8, but you must verify pinout and electrical compatibility before use. For a true drop-in replacement, stick with the VIPER22A family.

Is VIPER22ADIP the same as VIPER22A?

VIPER22ADIP is a specific package variant of the VIPER22A. The VIPER22A is the base part number, and the suffix 'DIP' indicates the 8-pin DIP package. Other variants include VIPER22AS (SO-8) and VIPER22ASTR (SO-8 tape and reel). The electrical characteristics are identical across all package variants.

Engineering reference data for VIPER22ADIP — comparison, design guidance, and compliance information.

Selection Guide

Choose the VIPER22ADIP when you need a low-cost, through-hole offline switching regulator for applications up to 12W, such as AC/DC adapters, standby power supplies, and battery chargers. Its integrated Power MOSFET and PWM controller reduce component count and simplify design. If you prefer surface-mount assembly, choose the VIPER22AS (SO-8) variant, which has identical electrical specifications. For cross-brand alternatives, the LNK304PN from Power Integrations and the NCP1014AP100 from onsemi are potential drop-in replacements in DIP-8, but you must verify pinout and electrical compatibility. The LNK304PN offers lower standby power (<0.3W) and a higher switching frequency (66kHz), while the NCP1014AP100 has a higher frequency (100kHz) and lower standby power (<0.1W). However, the VIPER22ADIP's 730V MOSFET and frequency jittering provide advantages in surge immunity and EMI compliance. For applications requiring the highest efficiency and lowest standby power, consider the NCP1014AP100, but for a proven, robust design with global availability, the VIPER22ADIP is an excellent choice.

Comparison with Alternatives

Parameter	This Product	VIPER22AS	LNK304PN	NCP1014AP100
Package	DIP-8	SO-8	DIP-8	DIP-8
Brand	STMicroelectronics	STMicroelectronics	Power Integrations	onsemi
Output Power (230VAC)	12 W	12 W	12 W	10 W
Switching Frequency	60 kHz	60 kHz	66 kHz	100 kHz
Power MOSFET Breakdown Voltage	730 V	730 V	700 V	700 V
Standby Power	< 0.5 W	< 0.5 W	< 0.3 W	< 0.1 W
Protection Features	OCP, OVP, OTP	OCP, OVP, OTP	OCP, OTP	OCP, OVP, OTP
Frequency Jittering	Yes	Yes	Yes	No

Key Differentiators

Integrated 730V avalanche-rugged Power MOSFET (vs LNK304PN)
Frequency jittering for EMI reduction (vs NCP1014AP100)
Same-brand package variants for design flexibility (vs VIPER22AS)

Design Notes

For the VIPER22ADIP, ensure adequate copper area on the drain and source pins for heat dissipation. The DIP-8 package has a junction-to-ambient thermal resistance of 80°C/W, so at 12W output, the power dissipation can be significant. Use a ground plane and thermal vias to improve heat spreading. Keep the high-voltage traces short and away from sensitive feedback components to minimize noise coupling.

A common pitfall is neglecting the snubber circuit across the transformer primary. The leakage inductance can cause voltage spikes that exceed the 730V breakdown voltage of the internal MOSFET, leading to failure. Use an RCD snubber or a TVS diode to clamp the voltage. Also, ensure the feedback loop is properly compensated to avoid instability, especially in continuous conduction mode.

The VIPER22ADIP's thermal shutdown protects the device, but it should not be relied upon for normal operation. At maximum output power, the junction temperature can rise significantly. Calculate the power dissipation (PD = (VIN - VOUT) * IOUT for buck, or based on transformer design for flyback) and ensure the junction temperature stays below 125°C for reliable operation. Use a heatsink or increase copper area if necessary.