UCC33420 - 1.5W Isolated DC/DC Module 3kVRMS | Texas Instruments
MPN: UCC33420 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.95 | $4.95 |
| 10 | $4.45 | $44.50 |
| 100 | $3.95 | $395.00 |
| 500 | $3.55 | $1,775.00 |
| 1,000 | $3.2 | $3,200.00 |
UCC33420 Overview
An isolated DC/DC converter is a power conversion module that provides galvanic isolation between input and output, preventing DC current flow while transferring power across a safety barrier. It sits within the power management IC hierarchy and is essential in systems requiring safety isolation, ground-loop elimination, or noise isolation, such as industrial automation, medical devices, and automotive electronics. The UCC33420 integrates the transformer and power stage in a single package, reducing board space versus discrete transformer-plus-driver solutions.
Key features include a proprietary transformer architecture achieving a 3kVRMS isolation rating with low EMI and excellent load regulation of 0.5% typical and line regulation of 4mV/V typical. Integrated protection features include an enable pin with fault reporting mechanism, short circuit protection, and thermal shutdown, increasing overall system robustness.
Technically, the UCC33420 uses integrated transformer technology in a multichip module, which minimizes parasitic inductance, improves EMI performance, and achieves high power density. The selectable 5.0V/5.5V output headroom supports driving isolated gate-driver rails, with 300mA available load current per DigiKey listing (200mA at 5.0V per datasheet feature listing for the 1.0W variant).
Typical applications include isolated bias supplies for IGBT and SiC gate drivers, industrial fieldbus transceiver power, isolated sensor interfaces, and automotive isolated rails when using the UCC33420-Q1 variant.
Design tip: maintain the >4.1mm clearance and creepage on the PCB layout and place input/output capacitors close to the package pins to preserve low-EMI performance.
Drop-in alternatives for UCC33420 — 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:
UCC33420RAQR
✅ Drop-In📋 Reference alternative (not in catalog)
UCC33420-Q1
✅ Drop-In📋 Reference alternative (not in catalog)
UCC33420QRAQRQ1
✅ Drop-In📋 Reference alternative (not in catalog)
UCC33411-Q1
⚡ Same Package ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
UCC33420 Maximum Ratings & Electrical Characteristics
| Isolated Output Power | 1.5 W |
| Input Voltage Range | 4.5 V to 5.5 V |
| Output Voltage | 5.0 V (5.5 V headroom selectable) |
| Output Current | 300 mA (per DigiKey listing) |
| Isolation Rating | 3 kVRMS |
| Load Regulation | 0.5% typical |
| Line Regulation | 4 mV/V typical |
| Number of Outputs | 1 |
| Protection Features | Enable with fault reporting, short circuit protection, thermal shutdown |
| Clearance and Creepage | > 4.1 mm |
| Package | VSON (4.00 mm x 5.00 mm), 1.00 mm height |
| Mounting Type | Surface Mount |
| Automotive Qualification | UCC33420-Q1 variant AEC-Q100 qualified |
| EMI Performance | Low EMI (integrated transformer architecture) |
UCC33420 Pin Configuration
| Pin 1 | VINP — Primary-side input supply (4.5V to 5.5V) |
| Pin 2 | GNDP — Primary-side ground |
| Pin 3 | EN/FLT — Enable input with fault reporting function |
| Pin 4 | VOUT — Isolated regulated output (5.0V / 5.5V selectable) |
| Pin 5 | GNDN — Secondary-side ground |
| Pin 6 | SEL — Output headroom selection (5.0V / 5.5V) - verify against datasheet pinout diagram |
Typical Applications
UCC33420 is suitable for 6 applications: IGBT/SiC Gate Driver Bias Supply, Isolated Fieldbus and CAN Transceiver Power, Automotive Isolated Rails (UCC33420-Q1), Isolated Precision Analog and Sensor Interfaces, Medical Isolated Power Rails, Industrial PLC and Automation Modules.
IGBT/SiC Gate Driver Bias Supply
The UCC33420's selectable 5.5V output headroom and 3kVRMS isolation make it ideal for powering the secondary-side supply of isolated gate drivers in high-voltage inverters. Placed across the isolation barrier from a 5V primary rail, it delivers up to 300mA to the gate-driver IC while its >4.1mm creepage supports the system's working voltage requirements. Integrated short-circuit and thermal protection improves robustness against gate-drive faults such as shoot-through events.
Recommended
Isolated Fieldbus and CAN Transceiver Power
Industrial fieldbus transceivers such as isolated CAN and RS-485 require an isolated 5V rail on the bus side. The UCC33420's low EMI integrated transformer and 0.5% typical load regulation provide a clean, stable bus-side supply without a discrete transformer circuit. Its 4.5V-5.5V input tolerance allows direct connection to a 5V backplane rail, and the enable/fault pin supports system-level power health monitoring.
Recommended
Automotive Isolated Rails (UCC33420-Q1)
In automotive systems such as on-board chargers, battery management, and ADAS sensor interfaces, the AEC-Q100-qualified UCC33420-Q1 provides the same 1.5W, 3kVRMS isolated 5V rail with automotive-grade reliability. The integrated transformer eliminates hand-wound magnetics that add variability, and thermal shutdown plus fault reporting support the functional-safety diagnostics expected in 12V/48V domain controllers.
Recommended
Isolated Precision Analog and Sensor Interfaces
Isolated ADC front-ends for industrial sensing benefit from the UCC33420's 4mV/V typical line regulation and low output noise on the field side. It supplies isolated 5V power to delta-sigma ADCs, amplifiers, and modulators on the non-ground-referenced side of the barrier, breaking ground loops that would otherwise corrupt microvolt-level measurements in motor shunt sensing or PLC analog modules.
Recommended
Medical Isolated Power Rails
Patient-connected medical equipment requires reinforced isolation on power and data interfaces. The UCC33420's 3kVRMS isolation barrier with >4.1mm clearance and creepage in a compact 4x5mm package provides isolated 5V power for front-end electronics while conserving board space in portable diagnostic devices. Its integrated approach reduces component count versus discrete transformer solutions, aiding design verification.
Recommended
Industrial PLC and Automation Modules
PLCs and motor-control modules use the UCC33420 to generate isolated 5V logic rails for I/O isolation channels. Its 1.5W output supports several isolators and small microcontrollers per channel, while the fault-reporting enable pin integrates with module diagnostics. Low EMI from the integrated transformer reduces conducted emissions concerns in dense control cabinets conforming to industrial EMC expectations.
Recommended
Recommended Products Summary
Engineering reference data for UCC33420 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | UCC33420RAQR | UCC33420-Q1 | ADuM5010 |
|---|---|---|---|---|
| Package | VSON 4x5mm | VSON 4x5mm - same | VSON 4x5mm - same | SOIC-8 - different |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices |
| Output Power | 1.5 W | 1.5 W | 1.5 W | ~0.4 W class |
| Automotive Grade | No (UCC33420-Q1 variant available) | No | Yes (AEC-Q100) | No |
Key Differentiators
- Automotive-qualified pin-compatible variant (vs UCC33420-Q1)
- Integrated transformer vs discrete solutions (vs ADuM5010)
- Fault reporting via enable pin (vs UCC33411-Q1)
Design Notes
Maintain >4.1mm clearance and creepage across the isolation barrier on the PCB layout. Do not route primary-side or secondary-side traces under the package, and keep a void in internal copper planes beneath the device to preserve the isolation barrier. The 1.00mm package height supports compact stacking but does not reduce the required board-level creepage.
Place low-ESR ceramic decoupling capacitors (per datasheet recommendation, typically 10uF plus 0.1uF) directly at VINP/GNDP and VOUT/GNDN pins to minimize supply ripple and support transient load steps from gate-driver switching. The EN/FLT pin can be driven from 3.3V logic per TI E2E guidance, but verify enable thresholds and do not rely on it as fault output unless the datasheet open-drain configuration is followed.
Do not exceed the 4.5V-5.5V input range; the integrated transformer is designed for the fixed 5V-class rail, not wide-VIN operation. Respect the 1.5W (300mA at 5V) output budget and rely on the integrated short-circuit and thermal protection only as fault protection, not as continuous operating mode. Verify the SEL pin strapping for 5.0V vs 5.5V headroom before production.
Compliance Information
RoHS compliant and lead-free per TI/DigiKey product listings for the RAQ package. AEC-Q100 applies to the UCC33420-Q1 variant, not the base industrial UCC33420. Confirm REACH and conflict-minerals declarations on TI.com.
