CAP200DG-TL — Zero-Loss Automatic X-Capacitor Discharge IC (SOIC-8)

What Are the Technical Specifications of CAP200DG-TL?

Key numbers that matter: per the CAPZero-2 family datasheet, the part is fully self-powered — no external bias rail, no ground pin. The 21.7µA self-supply is the whole control circuit, and the 1000V drain rating is what lets it sit across the mains before or after the fuse.

Why does the AC-removal detection time matter? 22–31.4ms — under two line cycles. The moment the plug leaves the wall, the switch closes and the capacitor starts bleeding through R1+R2. That's the difference between meeting the IEC 62368 discharge window and flunking a certification audit.

The creepage note is the one engineers skip: >4mm across the SOIC-8 width only works if you couple pins 1–4 together and pins 5–8 together on the PCB. Datasheet Figure 3 shows the exact pad tie — copy it.

When Should You Use (and NOT Use) the CAP200DG-TL?

✅ Use CAP200DG-TL when:

• Standby regulations are in the spec. ErP Lot 6, US DOE, and California CEC all lean on no-load draw. The bleeder is a fixed cost you can zero out with one part.
• You want a bigger X-cap for EMI without paying for it. A larger X-cap lets you shrink the differential-mode inductor. CAPZero removes the standby penalty that used to cap that trade-off.
• Adapters, chargers, and appliance boards under ~1kW. No-load power is a measurable fraction of the budget at this scale.
• New designs hitting IEC 62368-1. The single-fault discharge path through two independent pin pairs and 1000V-rated silicon is a cleaner compliance story than a resistor chain.
• Industrial 18VAC / 24VAC rails. The datasheet validates operation down to these low line voltages — unusual for a mains part.

❌ Don't use CAP200DG-TL when:

• Multi-kilowatt power stages. Bleeder loss is a rounding error next to the main loss. The BOM cost isn't justified.
• You need a zero-crossing signal. That's the CAP300DG's job — the CAP200DG is discharge-only.
• Ambient below -10°C. The operating range stops at -10°C; cold-environment products need a different discharge strategy.
• No X-capacitor in the design. If there's nothing across L-N, there's nothing to discharge.
• X-cap above 6µF. Discharge current through the internal MOSFET exceeds the safe rating — keep the capacitor in the 100nF–6µF window.

What Are the Alternatives to CAP200DG-TL?

The upgrade decision in one line: if you're already paying the 53mW tax for a 1MΩ bleeder, the CAP200DG-TL pays for itself in EU-market products — and the CAP300DG adds the zero-crossing output when the controller needs a mains-phase reference.

From our experience (2025–2026), the -TL vs non-TL question comes up more than it should: it's the same die. The suffix is tape-and-reel packaging. If a distributor quotes stock on one, the other ships the identical part.

Here's the thing to check before you design it in: your safety engineer will ask about the single-fault path. The CAP200DG answers with two independent pins per terminal — a lifted-pin fault on D1 (pins 2/3) or D2 (pins 6/7) can't open the discharge path.

What Are the Typical Applications of CAP200DG-TL?

Notebook and phone adapters: No-load draw targets have gotten brutal in the EU. The bleeder at 230VAC is pure loss with the adapter idle — CAPZero zeroes it, and the 100nF–6µF range covers the X-cap in almost every adapter class.

Appliance control boards: Washing machines, air conditioners, and other always-plugged appliances accumulate standby watts across the fleet. One part replaces a resistor that was never doing anything but waiting for the plug to come out.

Displays and TVs: Larger panels need bigger X-caps for conducted-emission margin. CAPZero lets the designer take the bigger cap — and the smaller inductor — without eating the standby penalty that used to force the compromise.

LED drivers with no-load requirements: Non-isolated and isolated driver designs with low standby budgets use the same two-terminal discharge trick across the EMI filter.

Low-voltage industrial rails (18/24VAC): The datasheet explicitly validates operation at industrial low-line voltages — where a fixed bleeder keeps burning power at 24VAC the same way it does at 230VAC.

Why Buy CAP200DG-TL from ICMASS?

Every lot verified against the CAPZero-2 datasheet. We test D1–D2 leakage and the 1000V drain rating on incoming lots before they hit the shelf. A remarked low-voltage part fails the 1000V check instantly — that's the test that catches the counterfeits.

Cross-reference support for the whole discharge family. Not sure whether your design wants CAP200DG or CAP300DG? Send us your X-cap value, standby target, and whether you need the zero-crossing output — we'll tell you which part the board actually needs.

BOM consolidation for AC-DC front ends. The same power-section BOM carries a Power Integrations switcher (LNK/TNY/TOP), a fast-recovery diode (UF4007-class), and the CAPZero discharge IC. One shipment from Shenzhen covers the whole input stage.

Same-day dispatch, 5–10 days worldwide. Orders before 15:00 CST ship same day via DHL or FedEx. Volume orders source directly from the PI-authorized line.

Frequently Asked Questions About CAP200DG-TL

Q1: Is the CAP200DG a capacitor? Can it replace the X-capacitor?

A: No — it's a switch in series with the discharge resistors. It never stores energy. When AC is live it blocks current through the bleeder (cutting loss to <5mW); when AC is removed it closes and lets R1+R2 discharge the X-cap. The X-cap stays in the circuit; the IC just decides when the bleeder burns power.

Q2: How much standby power does it actually save?

A: A fixed 1MΩ bleeder at 230VAC burns about 53mW continuously. CAPZero brings that to under 5mW — a 10x cut on the discharge path alone. On a 90W notebook adapter the discharge resistor is one of the biggest no-load losses left after the controller is optimized.

Q3: Does it connect before or after the input fuse?

A: Either is allowed. The datasheet qualifies the part for use before or after the system input fuse, relying on the >4mm creepage and clearance and the 1000V drain rating. Most designs put it on the line side with the X-cap it protects.

Q4: What happens when AC power is disconnected?

A: The IC detects the removal within 22–31.4ms and closes the internal switch. The X-cap then discharges through R1+R2 with an RC time constant under 1 second — meeting the IEC 62368-1 discharge requirement (safe voltage within the standard's window after unplug).

Q5: What X-capacitor range does it cover?

A: 100nF to 6µF — one part number covers the entire range. Above 6µF the discharge current through the internal MOSFET exceeds the safe rating; below 100nF the discharge requirement is usually met by a small fixed resistor without the IC.

Q6: Does it need an external bias supply?

A: No — it's fully self-powered. The 21.7µA typical supply current comes from the line itself, with no ground pin and no external bias rail. That's what makes it a true two-terminal drop-in in series with the bleeder.

Q7: How do I choose R1 and R2?

A: Total resistance 150kΩ to 7.5MΩ, split into two equal resistors, sized for the RC < 1s discharge rule. The split matters under fault: if D1 shorts to D2, each resistor takes half the dissipation — at 265VAC with R1=R2=75kΩ, that's about 234mW per resistor. Size them for the fault case, not the normal case.

Q8: Why are two pins used for each of D1 and D2?

A: Single-pin fault redundancy. A lifted pin on D1 or D2 can't open the discharge path, because each terminal has two connected pins (2/3 for D1, 6/7 for D2). The datasheet states it's not possible to create a fault condition through a single pin fault — which is exactly what a safety audit looks for.

Q9: What's the difference between CAP200DG and CAP300DG?

A: CAP300DG adds a lossless zero-crossing signal output. Both are CAPZero-2 discharge ICs with the same <5mW standby loss; the CAP300DG also feeds a mains-phase reference to the controller. If you don't need the timing signal, CAP200DG is the simpler, cheaper choice.

Q10: Is it worth it in a high-power supply?

A: Usually not. In a multi-kilowatt PSU, bleeder loss is a rounding error next to the main-stage losses, and the CAPZero BOM cost isn't justified. The part pays off where no-load power is regulated and the input cap is significant — adapters, appliances, and displays under roughly 1kW.