company blog about Mingjiada Mass Supplies UCC33421 Isolated DC-DC Modules, Suitable for BMS and Industrial Isolated Auxiliary Power Supplies

Mingjiada offers a large supply of the UCC33421: a 5V/5V, 1.5W, 5kVrms isolated DC-DC module with an integrated transformer, suitable for BMS and industrial isolated auxiliary power supplies

I. UCC33421 Product Overview

The UCC33421 is a next-generation isolated DC/DC converter module from TI that utilizes integrated transformer technology to fully integrate the transformer, power stage, and control circuitry into a single 5.85 mm × 7.50 mm × 2.65 mm SO-16 ultra-compact package. Compared to traditional isolated power supply solutions requiring external transformers, the UCC33421 significantly reduces PCB footprint and height while enhancing system reliability.

The device supports an input voltage range of 4.5 V to 5.5 V and can be configured via the SEL pin to provide a regulated output of either 5.0 V or 5.5 V, delivering a load current of 300 mA at the 5.0 V output.

II. UCC33421 Key Features and Technical Advantages

1. High Isolation Performance

Isolation Rating: 5 kVrms (compliant with UL 1577/CSA standards)

Surge Capacity: 10.4 kVPK

Operating Voltage: 1,700 VPK

Common-Mode Transient Immunity (CMTI): 250 V/ns

Creepage Distance and Clearance >8.2 mm

Compliant with DIN EN IEC 60747-17 (VDE 0884-17) enhanced isolation standard

2. Outstanding Electrical Performance

Maximum Output Power: 1.5 W

Load Regulation: 0.5% (typical)

Linear regulation: 4 mV/V (typical)

±8 kV IEC 61000-4-2 contact discharge protection across the entire isolation barrier

3. Comprehensive Protection Features

Overload protection and short-circuit protection

Thermal shutdown protection

Soft start with low inrush current

Enable pins (EN/FLT) and fault reporting mechanism

4. Low EMI Design

Adaptive Spread Spectrum Modulation (SSM) technology

Compliant with CISPR-32 Class B radiated emission standards

Compliant with CISPR-25 Class 5 automotive EMC standards (Version Q1)

High magnetic field immunity

5. Wide Temperature Range

Operating temperature range: –40°C to 125°C

Functional Safety-Capable

III. UCC33421 Typical Application Scenarios

Thanks to its high integration, high isolation voltage, and wide temperature range, the UCC33421 is widely used in the following fields:

Automotive Electronics

Battery Management Systems (BMS) — Provides bias power for high-voltage detection and communication isolation in BMS

HEV/EV On-Board Chargers (OBC) and DC-DC Converters — Meets high-voltage isolation and power density requirements

Traction Inverters — Provides isolated power supply for IGBT/SiC drivers

Isolated Auxiliary Power Supplies for Digital Isolators — Powers ISO-series isolators

Industrial and Energy

Factory Automation PLC Modules — Powers isolated communication interfaces in PLCs

Electric Vehicle Charging Infrastructure —— Isolated Power Supplies in Charging Stations

Energy Storage System (ESS) Battery Management Systems

Smart Meters

PV/Solar Inverters

Communications and Measurement

Isolated Auxiliary Power Supplies for RS-485, RS-422, and CAN Buses

Bias Power Supplies for Isolated Voltage and Current Sensors

Bias Power Supplies for Isolated Signal Chains

Isolated Auxiliary Power Supplies for MCU Power Supplies

The UCC33421 is particularly well-suited for applications with limited board space that require higher integration, as well as high-voltage applications that must meet strict isolation specifications.

IV. Mingjiada Electronics — Genuine OEM Products, Abundant Stock on Hand

Established in 1996, Shenzhen Mingjiada Electronics Co., Ltd. is a globally renowned authorized independent distributor of electronic components and has obtained ISO 9001 Quality Management System and ISO 14001 Environmental Management System certifications. The company’s business covers IC chips, connectors, modules, and various electronic components, serving sectors such as 5G communications, automotive electronics, industrial control, and consumer electronics.

Mingjiada currently offers a large supply of UCC33421 isolated DC-DC modules and guarantees:

• Genuine factory products with quality assurance
• Abundant in-stock inventory (1,000+ pcs) and fast delivery
• Competitive pricing to reduce procurement costs

Mingjiada Electronics offers a large supply of UCC33421 (UCC33421DHAR)—genuine factory products with ample stock. Inquiries are welcome!

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