NCP43080DMTTWG - Secondary-Side SR Controller | onsemi
MPN: NCP43080DMTTWG ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.0318 | $1.03 |
| 10 | $1.0318 | $10.32 |
| 100 | $1.0318 | $103.18 |
| 500 | $1.0318 | $515.90 |
| 1,000 | $1.0318 | $1,031.80 |
NCP43080DMTTWG Overview
A synchronous-rectifier controller is a power-management IC used in the secondary circuit of an isolated or non-isolated offline power supply. Instead of allowing a diode to conduct during the secondary rectification interval, the controller drives an external MOSFET to act as a low-loss rectifier. The controller belongs to the broader sequence of switch-mode power-supply components: transformer or inductor energy transfer, primary switching, secondary rectification, output filtering, and regulated feedback.
The NCP43080 family targets applications where efficiency and secondary-side behavior are important. Its blanking controls help prevent unwanted MOSFET turn-on or turn-off during switching transitions. These protections are especially relevant when leakage currents, ringing, transformer reset behavior, or differing MOSFET switching speeds could otherwise cause false gate-drive pulses. The exact electrical ratings, timing limits, pin names, and recommended external components require confirmation from the manufacturer datasheet and the selected transformer and MOSFET design.
Typical implementation targets include isolated flyback chargers, quasi-resonant flyback adapters, power supplies for consumer electronics, and LLC converter secondary stages. The controller is especially relevant where a Schottky diode would otherwise dissipate significant power at high output current. The external MOSFET selection must be coordinated with output voltage, current, switching frequency, transformer reset behavior, gate-drive requirements, and thermal conditions.
The principal design consideration is timing coordination between the primary switch and the secondary synchronous MOSFET. Minimum off-time, minimum on-time, propagation behavior, dead time, and layout parasitics determine whether the replacement can improve efficiency without introducing cross-conduction or shoot-through. The package must be placed according to the datasheet layout guidance, with attention to high-current source and return paths, gate-loop inductance, and thermal dissipation.
This product page combines the verified onsemi product identity, distributor package information, the official NCP43080 datasheet link, and practical design guidance. Unavailable ratings and package details are intentionally marked for verification rather than inferred from generic controller families.
Drop-in alternatives for NCP43080DMTTWG — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
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Request AlternativesNCP43080DMTTWG Maximum Ratings & Electrical Characteristics
| Product Type | Secondary-side synchronous-rectifier controller |
| Supported Power-Supply Topologies | Flyback, quasi-resonant flyback, LLC |
| Output Configuration | Secondary-side synchronous-rectifier drive |
| Minimum Off-Time | Externally adjustable |
| Minimum On-Time | Externally adjustable on-time blanking period |
| MOSFET Drive | External synchronous-rectifier MOSFET |
| Package | 8-WDFN, 2 x 2 mm |
| Mounting Type | Surface mount |
| Controller Topology | Synchronous secondary rectifier |
| Application Category | Switch-mode power supply |
| RoHS Status | unknown |
| REACH Status | unknown |
| AEC-Q100 Qualification | not_applicable |
| Lead-Free Status | unknown |
| Manufacturer | onsemi |
| MPN | NCP43080DMTTWG |
NCP43080DMTTWG 8-wdfn, 2 x 2 mm Pin Configuration Guide
Pin configuration for NCP43080DMTTWG (8-wdfn, 2 x 2 mm 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.
No detailed pinout data available for NCP43080DMTTWG.
Refer to the datasheet for full pin configuration.
Typical Applications
NCP43080DMTTWG is suitable for 6 applications: Isolated Flyback Charger, Quasi-Resonant Flyback Adapter, Consumer Electronics Power Supply, LLC Resonant Converter, High-Current Offline Power Module, Low-Noise Power Conversion Stage.
Isolated Flyback Charger
The NCP43080DMTTWG fits a secondary rectification stage in an isolated flyback charger where a conventional diode can waste power as output current rises. The controller drives an external MOSFET in place of the diode and uses externally adjustable blanking periods to suppress unwanted transitions during transformer reset. Designers should match the MOSFET to the secondary peak voltage, output current, switching frequency, and thermal budget, then verify timing across startup, steady-state load, and fault conditions.
Recommended
Quasi-Resonant Flyback Adapter
In a quasi-resonant flyback adapter, the NCP43080DMTTWG can manage secondary synchronous rectification while the primary switching waveform contains resonant transitions. Its externally adjustable off-time and on-time blanking provide implementation flexibility for different MOSFET packages and board layouts. The final timing values must be checked against leakage-induced ringing and the selected external MOSFET, because excessive blanking reduces synchronous conduction while insufficient blanking can cause false turn-on.
Recommended
Consumer Electronics Power Supply
The NCP43080DMTTWG is suitable for a secondary side of a compact consumer-electronics supply where efficiency and component count matter. Replacing a conventional rectifier with a controlled MOSFET can reduce conduction losses and support higher output current without relying on a large diode package. The external MOSFET, output capacitor, transformer winding, and feedback network must be selected together, and the controller must be checked for stable operation over the complete line and load range.
Recommended
LLC Resonant Converter
The NCP43080DMTTWG is supported for LLC converter applications by the official onsemi product description. In an LLC stage, the controller coordinates the external secondary MOSFET with resonant switching transitions, but the exact implementation depends on transformer design and operating mode. Engineers should validate dead time, body-diode behavior, reverse voltage, and MOSFET switching transitions across the converter's frequency range rather than assuming that every LLC output condition is compatible.
Recommended
High-Current Offline Power Module
A high-current offline power module can benefit from synchronous secondary rectification because diode conduction loss grows with current and forward drop. The NCP43080DMTTWG provides the control function for coordinating an external MOSFET, while the system designer must handle layout, transformer insulation, current pulses, and heat dissipation. Use the controller's timing adjustments to accommodate the selected MOSFET and validate the design with worst-case line, load, startup, and short-circuit conditions.
Recommended
Low-Noise Power Conversion Stage
The NCP43080DMTTWG can support a low-noise secondary conversion stage when the external MOSFET, transformer, and layout are carefully selected. Synchronous rectification avoids the inherent forward-drop loss of a diode, while the controller's blanking functions help maintain controlled gate-drive behavior during transitions. Low-noise performance still depends on output filtering, switch-node layout, transformer shielding or coupling, and the load, so ripple should be measured rather than inferred from the controller alone.
Recommended
Engineering reference data for NCP43080DMTTWG — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product |
|---|---|
| Package | 8-WDFN, 2 x 2 mm |
| Brand | onsemi |
| Product Type | Secondary-side synchronous-rectifier controller |
| Supported Topology | Flyback, quasi-resonant flyback, LLC |
| Minimum Off-Time | Externally adjustable |
| Minimum On-Time | Externally adjustable on-time blanking |
| External Rectifier | External MOSFET |
| Mounting Type | Surface mount |
| Manufacturer Reference Price | $1.0318 reference price |
| Special Features | Reliable, low-noise synchronous-rectifier operation |
Key Differentiators
- Broad topology coverage for secondary synchronous rectification (vs Generic diode-based secondary rectifier)
- Externally adjustable blanking periods (vs Fixed-timing diode or basic rectifier circuit)
- Compact surface-mount implementation (vs Larger discrete rectifier arrangement)
Design Notes
Keep the gate-drive loop between the NCP43080DMTTWG and the external synchronous MOSFET as short and compact as practical. Route the MOSFET source and power return so the gate loop does not include the high-current output path. Place the timing and blanking components near their associated pins, and keep the controller ground connection continuous to the package ground and exposed-pad structure specified by the datasheet.
Do not choose blanking values from the controller family name alone. Transformer leakage, switch-node ringing, MOSFET gate capacitance, and load current can create false turn-on or delayed turn-off conditions. Start from the manufacturer application guidance, then verify the timing with an oscilloscope across the expected line, load, startup, and fault conditions. Excessive off-time reduces synchronous conduction and can undermine the efficiency benefit.
The controller itself and the external MOSFET form different thermal paths, so assess both rather than assuming the small controller package limits rectifier temperature. Calculate MOSFET conduction and switching loss from the actual operating waveform, add estimated copper and thermal-path effects, and verify junction temperature against the selected device limits. Provide copper around the package and the exposed pad according to the manufacturer layout guidance.
Keep high-current secondary traces wide and short, and minimize the loop area between the transformer winding, synchronous MOSFET, output capacitor, and return plane. Place input/output decoupling and the controller supply bypass capacitor close to their pins. Because the package is only 2 x 2 mm, manufacturing capability and solder-mask-defined or paste-defined exposed-pad design should be reviewed before release to production.
Compliance Information
The verified data identifies the manufacturer, product family, package, topology support, distributor price, and official datasheet link, but does not state RoHS, REACH, lead-free, halogen-free, or conflict-minerals status. No unverified compliance claim is made.
