UCC33420 - 1.5W Isolated DC/DC Module 3kVRMS | Texas Instruments
MPN： UCC33420 ✓ 啟用中UCC33420 概覽
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.
直接替換替代品，適用於 UCC33420 — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
UCC33420RAQR
✅ 直接替換📋 參考替代品（不在目錄中）
UCC33420-Q1
✅ 直接替換📋 參考替代品（不在目錄中）
UCC33420QRAQRQ1
✅ 直接替換📋 參考替代品（不在目錄中）
UCC33411-Q1
⚡ 相同封裝 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
UCC33420 最大額定值與電氣特性
| Isolated Output Power | 1.5 W |
| 輸入電壓範圍 | 4.5 V to 5.5 V |
| 輸出電壓 | 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 |
| 輸出數量 | 1 |
| Protection Features | Enable with fault reporting, short circuit protection, thermal shutdown |
| Clearance and Creepage | > 4.1 mm |
| 封裝 | VSON (4.00 mm x 5.00 mm), 1.00 mm height |
| 安裝類型 | Surface Mount |
| Automotive Qualification | UCC33420-Q1 variant AEC-Q100 qualified |
| EMI Performance | Low EMI (integrated transformer architecture) |
UCC33420 腳位配置
| 腳位 1 | VINP — Primary-side input supply (4.5V to 5.5V) |
| 腳位 2 | GNDP — Primary-side ground |
| 腳位 3 | EN/FLT — Enable input with fault reporting function |
| 腳位 4 | VOUT — Isolated regulated output (5.0V / 5.5V selectable) |
| 腳位 5 | GNDN — Secondary-side ground |
| 腳位 6 | SEL — Output headroom selection (5.0V / 5.5V) - verify against datasheet pinout diagram |
典型應用
UCC33420 適用於 6 應用s: 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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
推薦產品摘要
工程參考資料，適用於 UCC33420 — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | 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 |
主要差異化特點
- Automotive-qualified pin-compatible variant (對比UCC33420-Q1)
- Integrated transformer vs discrete solutions (對比ADuM5010)
- Fault reporting via enable pin (對比UCC33411-Q1)
設計說明
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.
合規資訊
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.
