CAP200DG-TL

1. CAP200DG-TL Product Overview

CAP200DG-TL is the tape-and-reel ordering version of the CAP200DG CAPZero-2 Zero Loss Automatic X Capacitor Discharge IC from Power Integrations. The device is designed for AC input stages that use an X-class safety capacitor as part of the differential-mode EMI filter.

In a conventional AC input filter, discharge resistors are connected across the X capacitor so that the capacitor can safely discharge after AC power is removed. Those resistors also consume power whenever the equipment remains connected to the AC line. CAP200DG solves this problem by electronically disconnecting the discharge path while AC is present and reconnecting it automatically when AC is removed.

This approach allows designers to use the X capacitor required for EMI performance without accepting the continuous standby loss normally created by the discharge resistors. According to Power Integrations, CAP200DG reduces the power dissipated in the X-capacitor discharge network to less than 5 mW at 230 VAC while still providing automatic discharge when AC power is disconnected.

For purchasing teams, CAP200DG-TL is therefore more than a general control IC: it is a purpose-built high-voltage device used at the mains input of power supplies, adapters, appliances and other AC-DC systems where standby consumption, EMI design and discharge safety all matter.

2. Ordering Code & Lifecycle Status

The complete ordering code CAP200DG-TL contains package, environmental and packing information that should be checked when comparing distributor listings or substitute inventory.

Lifecycle note: Power Integrations currently lists CAP200DG as an active product, but also states that it is not recommended for new designs. The manufacturer identifies CAPZero-3 as the suggested newer family. Existing production, repair and legacy BOM requirements may still require CAP200DG-TL, but new designs should review the current Power Integrations recommendation before release.

This lifecycle status is important for sourcing decisions. A part can remain commercially available while no longer being the preferred choice for a new platform. Buyers should therefore distinguish between availability, design recommendation and drop-in compatibility.

3. Key Features

• Automatic X-capacitor discharge: reconnects the discharge resistor path when AC power is removed.
• Very low standby loss: less than 5 mW consumption at 230 VAC for the supported X-capacitor range.
• Wide X-capacitor coverage: one device supports X capacitors from 100 nF to 6 µF.
• High-voltage capability: 1000 V breakdown-voltage rating for the internal high-voltage structure.
• Two-terminal functional architecture: does not require an external bias supply or ground reference.
• High common-mode surge immunity: no external ground connection is required.
• EMI design flexibility: larger X-capacitor values can be used without adding continuous resistor loss.
• Safety-oriented package geometry: package and PCB layout can provide more than 4 mm creepage / clearance between the two terminals.
• Certified family: Power Integrations lists NEMKO and CB certification resources for the CAPZero-2 family.

4. CAP200DG-TL Technical Specifications

Electrical values above are provided as a product-identification and engineering-reference summary. Absolute limits, test conditions, safety requirements and final component selection should always be checked against the current official Power Integrations documentation before design release or mass production.

5. How CAP200DG-TL Works

When AC Power Is Present

CAP200DG senses the presence of AC voltage and blocks current through the external X-capacitor discharge resistors. Because the discharge-resistor path is effectively removed from the continuous AC input, the standby loss that would normally be created by those resistors is greatly reduced.

When AC Power Is Removed

After AC power is disconnected, CAP200DG reconnects the discharge path so that the external resistors can discharge the X capacitor. The device continues the discharge process below the safety extra-low-voltage level rather than stopping immediately once that level is reached.

Why This Matters in Power-Supply Design

EMI compliance often benefits from a larger X capacitor, but a larger capacitor normally requires a lower-value discharge resistance to meet discharge-time requirements. That lower resistance creates more standby power loss when connected permanently across the AC line. CAP200DG separates those two design constraints: the designer can optimize the X capacitor for differential-mode EMI performance while reducing the continuous power loss of the discharge network.

6. Design & PCB Considerations

External Discharge Resistor Selection

CAP200DG is used together with external discharge resistors. The required resistor value depends on the X-capacitor value and the discharge time constant required by the application. Power Integrations specifies a nominal total resistance range from 7.5 MΩ down to 142 kΩ across the supported X-capacitor range.

The resistor network should not be selected only from a generic RC formula. The final design should follow the CAPZero-2 component-selection guidance and applicable safety standard for the actual equipment.

Surge and MOV Placement

The manufacturer datasheet discusses the location of the MOV relative to the X capacitor and CAP200DG. The device has a 1000 V breakdown-voltage rating, but allowable system surge conditions depend on the final input-filter arrangement. Power Integrations recommends measuring the peak voltage between the D1 and D2 terminals during final-system surge testing.

Creepage and Clearance

CAP200DG uses the width of the SO-8 package to maintain separation between its two high-voltage terminals. The datasheet notes that the package and recommended PCB arrangement can provide more than 4 mm creepage and clearance. PCB copper, resistor placement, MOV placement and safety spacing must still be reviewed in the context of the complete product certification.

Low-Voltage AC Applications

The manufacturer states that the discharge action continues after the X capacitor falls below SELV, allowing CAP200DG to be used in lower-voltage AC systems such as common 18 VAC and 24 VAC rails where automatic capacitor discharge is still required.

7. Pin / Terminal Reference

CAP200DG operates functionally as a two-terminal device, identified as D1 and D2. In the SO-8 package, the internal electrical connections are made to multiple physical pins to support spacing and reliability.

Do not infer pin-to-pin compatibility from the SO-8 package alone. CAP200DG uses a specialized high-voltage terminal arrangement, so PCB footprint and copper connection should be checked against the official package and application drawings.

8. Typical Applications

• AC-DC converters using X capacitors from 100 nF to 6 µF.
• Power adapters designed for ultra-low no-load consumption.
• Appliances and equipment targeting low standby-power requirements.
• Power supplies where differential-mode EMI filtering requires a larger X capacitor.
• Converters that need automatic X-capacitor discharge after AC removal.
• Systems where elimination of continuous discharge-resistor loss improves overall standby efficiency.
• Circuits using lossless zero-crossing signal generation techniques described in CAPZero-2 application material.

9. Sourcing & Procurement Notes

Established in 2004, {site.name} supports electronic-component procurement across standard distribution, shortage sourcing and excess-inventory channels. For a part such as CAP200DG-TL, procurement should consider more than only the quoted unit price.

Information to Confirm Before Ordering

• Exact MPN: confirm CAP200DG-TL rather than only CAP200DG.
• Manufacturer: Power Integrations.
• Package: D package / SO-8.
• Environmental option: G green / halogen-free / RoHS-compliant ordering option.
• Packing: TL tape-and-reel, 2,500 pieces per reel.
• Quantity: required order quantity and acceptable split shipment.
• Date code: required production date range if the project has a date-code policy.
• Lifecycle: active, but not recommended for new designs according to the manufacturer.
• Traceability: request source documentation when required by the project or quality plan.

Shortage and Obsolescence Support

When normal authorized-channel stock is constrained, sourcing may involve a broader supplier network. Our procurement process can review distributor inventory, franchised channels, established brokers and OEM excess stock depending on the urgency, quantity and documentation requirements of the project.

For legacy production, CAP200DG-TL availability can also be evaluated together with lifecycle risk. If the project is a new design, the sourcing decision should be coordinated with engineering so that the manufacturer's newer CAPZero family can be evaluated before committing to a long-term BOM.

Excess Inventory

If a customer holds unused CAP200DG-TL inventory, excess-stock disposition can also be reviewed. Manufacturer, lot information, quantity, packing condition, date code and available traceability documents should be provided before the stock is evaluated for resale.

10. Quality Control & Authenticity Review

High-voltage mains-interface components require particular attention to source quality. {site.name} can apply different inspection levels according to the source, order value, customer requirements and risk profile.

Appearance and Packaging Inspection

• Check package marking, logo, lot/date-code format and physical condition.
• Compare label and reel information with the declared manufacturer and ordering code.
• Inspect lead condition, package damage, contamination and signs of rework.
• Confirm that the supplied packing format matches the CAP200DG-TL tape-and-reel requirement when applicable.

Electrical Testing

Where project risk justifies it, electrical testing can be considered against relevant device characteristics and the available manufacturer specification. Test scope depends on quantity, equipment capability and customer requirements.

X-Ray Inspection

X-ray inspection can be used when internal construction comparison is needed. The objective is to identify inconsistencies in die, bond-wire or internal package structure that may justify deeper investigation.

Decapsulation Review

For higher-risk cases, decapsulation may be used to expose the die for inspection of internal markings, manufacturer identification and construction details. Because decapsulation is destructive, it should be planned as a sample-based test.

Third-Party Laboratory Testing

When independent evidence is required, samples can be submitted to a qualified third-party laboratory according to the customer's requested test scope. The required report type should be agreed before testing.

No inspection method should be treated as a substitute for appropriate supplier qualification, traceability review and engineering validation. Quality control is strongest when source, documentation, physical inspection and electrical evidence are considered together.

11. Lifecycle & Alternative-Part Guidance

CAP200DG is currently shown by Power Integrations as active but not recommended for new designs. The manufacturer points designers toward CAPZero-3 as the suggested newer family.

This does not mean a CAPZero-3 device should automatically replace CAP200DG-TL. Any alternative must be checked at system level. At minimum, engineering should compare:

• Supported X-capacitor range.
• Required external discharge resistance.
• Breakdown-voltage and surge capability.
• AC-removal detection and discharge behavior.
• Package dimensions and PCB footprint.
• Terminal arrangement and creepage / clearance.
• Applicable safety certifications.
• Standby-power target.
• MOV placement and EMI-filter topology.
• Production qualification and regulatory impact.

For an existing approved BOM, changing from CAP200DG-TL to another family should be treated as an engineering change rather than a purchasing-only substitution.

12. Manufacturer Sources & Verification

This technical reference is built around the Power Integrations CAPZero-2 product information and CAP200DG manufacturer datasheet. Manufacturer documentation should remain the primary source for electrical limits, package dimensions, certification status and design guidance.

• Power Integrations CAP200DG Product Page: View official product information
• Power Integrations CAPZero-2 Datasheet: View official datasheet
• CAPZero-2 Family: View family page and current lifecycle guidance

EEAT / verification note: Product specifications can change through datasheet revisions, PCNs, lifecycle updates or package changes. Before design, procurement or production, verify the current manufacturer datasheet, current lifecycle status and the exact ordering code against the material being purchased.

Technical Information Disclaimer: This content is intended for product identification, engineering reference and sourcing support. It is not a substitute for the manufacturer's official datasheet, safety certification documents, application notes or the customer's own engineering qualification process.