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UCC33421

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5V/5V, 1.5W, 5kVrms isolated DC-DC module with integrated transformer

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Data sheet

UCC33421

ACTIVE
Data sheet Order now

Product details

Rating Catalog Vin (max) (V) 5.5 Vin (min) (V) 4.5 Vout (max) (V) 5.7 Vout (min) (V) 4.85 Features 1.5W, Regulated, Reinforced isolation, Single output Device type Isolated modules Regulated outputs (#) 1 TI functional safety category Functional Safety-Capable Isolation rating Reinforced Operating temperature range (°C) -40 to 125
Rating Catalog Vin (max) (V) 5.5 Vin (min) (V) 4.5 Vout (max) (V) 5.7 Vout (min) (V) 4.85 Features 1.5W, Regulated, Reinforced isolation, Single output Device type Isolated modules Regulated outputs (#) 1 TI functional safety category Functional Safety-Capable Isolation rating Reinforced Operating temperature range (°C) -40 to 125
SO-MOD (DHA) 16 60.255 mm² 5.85 x 10.3
  • 1.5W maximum output power
  • 4.5V to 5.5V input voltage operation range
  • 5.0V, 5.5V regulated selectable output voltage
    • 5.0V: 300mA available load current
  • 0.5% typical load regulation
  • 4mV/V typical line regulation
  • Robust isolation barrier:
    • Isolation rating: 5kVRMS
    • Surge capability: 10.4kVPK
    • Working voltage: 1700VPK
    • ± 8KV IEC 61000-4-2 contact discharge protection across isolation barrier
    • 250V/ns common mode transient immunity
  • Power dense isolated DC/DC module with integrated transformer technology
  • Adaptive spread spectrum modulation (SSM)
  • Meets CISPR-32 Class B emission
  • Strong magnetic fields immunity
  • Overload and short circuit protection
  • Thermal shutdown
  • Low inrush current soft-start
  • Enable pin with fault reporting mechanism
  • Extended temperature range: –40°C to 125°C
  • SSOP-16 (5.85mm × 7.50mm) package
  • >8.2mm clearance and creepage
  • 1.5W maximum output power
  • 4.5V to 5.5V input voltage operation range
  • 5.0V, 5.5V regulated selectable output voltage
    • 5.0V: 300mA available load current
  • 0.5% typical load regulation
  • 4mV/V typical line regulation
  • Robust isolation barrier:
    • Isolation rating: 5kVRMS
    • Surge capability: 10.4kVPK
    • Working voltage: 1700VPK
    • ± 8KV IEC 61000-4-2 contact discharge protection across isolation barrier
    • 250V/ns common mode transient immunity
  • Power dense isolated DC/DC module with integrated transformer technology
  • Adaptive spread spectrum modulation (SSM)
  • Meets CISPR-32 Class B emission
  • Strong magnetic fields immunity
  • Overload and short circuit protection
  • Thermal shutdown
  • Low inrush current soft-start
  • Enable pin with fault reporting mechanism
  • Extended temperature range: –40°C to 125°C
  • SSOP-16 (5.85mm × 7.50mm) package
  • >8.2mm clearance and creepage

The UCC33421 is an industrial DC/DC power module with integrated transformer technology designed to provide 1.5W of isolated output power. It can support an input voltage operation range of 4.5V to 5.5V and regulate 5.0V output voltage with a selectable headroom of 5.5V.

The UCC33421 features a proprietary transformer architecture that achieves a 5kVRMS isolation rating, while simultaneously supporting low EMI and excellent load regulation.

The UCC33421 integrates protection features for increased system robustness such as enable pin with fault reporting mechanism, short circuit protection and thermal shutdown.

The UCC33421 comes in a miniaturized, low-profile SSOP (5.85mm × 7.50mm) package with 2.65mm height and > 8.2mm clearance and creepage.

The UCC33421 is an industrial DC/DC power module with integrated transformer technology designed to provide 1.5W of isolated output power. It can support an input voltage operation range of 4.5V to 5.5V and regulate 5.0V output voltage with a selectable headroom of 5.5V.

The UCC33421 features a proprietary transformer architecture that achieves a 5kVRMS isolation rating, while simultaneously supporting low EMI and excellent load regulation.

The UCC33421 integrates protection features for increased system robustness such as enable pin with fault reporting mechanism, short circuit protection and thermal shutdown.

The UCC33421 comes in a miniaturized, low-profile SSOP (5.85mm × 7.50mm) package with 2.65mm height and > 8.2mm clearance and creepage.
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Technical documentation

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Type Title Date
* Data sheet UCC33421 Ultra-Small, 1.5W , 5.0V , 5kVRMS Isolation, Industrial DC/DC Module datasheet PDF | HTML 12 Sep 2025
Application note How to Pass CISPR32 Class B for UCC33420-Q1 PDF | HTML 29 Oct 2025
Certificate UCC33421-Q1 Certificate of Compliance CISPR25 Class 5 28 Oct 2025
Functional safety information UCC33011(Q1), UCC33021(Q1) UCC33411(Q1), and UCC33421(Q1) Functional Safety FIT Rate, FMD and Pin FMA PDF | HTML 16 Sep 2025
Certificate UCC33421 Certificate of Compliance CISPR32 Class B 20 Aug 2025
Application note Insulation Resistance Detection Designs in GESS-BMS PDF | HTML 22 Jan 2025

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

UCC33421EVM-092 — UCC33421 evaluation module

The UCC33421EVM-092 is intended to allow designers to evaluate the performance and capabilities of the UCC33xx1 family of automotive and industrial devices. UCC33421 is an isolated DC/DC converter module able to deliver 1.5W with 5kVrms of isolation in a very small and compact DHA-16 package (...)
User guide: PDF | HTML
Not available on TI.com
Simulation model

UCC3342x and UCC3342x-Q1 SIMPLIS Model (Rev. B)

SLUM888B.ZIP (88 KB) - SIMPLIS Model
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Calculation tool

UCC3342X-CALC — Soft-start rise time and steady-state burst-on duration calculator

This calculator is used to calculate the soft-start rise time and steady state burst-on duration for UCC3342x devices with different load and output capacitor configurations
Supported products & hardware

Supported products & hardware

Products
Isolated power modules (integrated transformer)
UCC33420 — 5V/5V 1.5W 3kVrms isolated DC-DC module with integrated transformer UCC33420-Q1 — Automotive, 5V/5V 1.5W 3kVrms isolated DC-DC module with integrated transformer UCC33421 — 5V/5V, 1.5W, 5kVrms isolated DC-DC module with integrated transformer UCC33421-Q1 — Automotive, 5V/5V, 1.5W regulated 5kVRMS isolated DC/DC power module with integrated transformer
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Reference designs

TIDA-01606 — 11-kW, bidirectional three-phase three-level (T-type) inverter and PFC reference design

This reference design provides an overview on how to implement a bidirectional three-level, three-phase, SiC-based active front end (AFE) inverter and power factor correction (PFC) stage. The design uses switching frequency up to 90kHz and an LCL output filter to reduce the size of the magnetics. (...)
Design guide: PDF
Schematic: PDF
Package Pins CAD symbols, footprints & 3D models
SO-MOD (DHA) 16 Ultra Librarian
TI's Standard Terms and Conditions for Evaluation Items apply.

Ordering & quality

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Recommended products may have parameters, evaluation modules or reference designs related to this TI product.

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