Name: UH2H Series Half Brick DC/DC Converter
Brand: OneTech Integration
Availability: InStock

Why UH2H Series

High Voltage, High Power, High Reliability

The UH2H Series bridges the gap between AC front-end PFC stages and isolated DC output rails. Accepting 200–420Vdc input (380V nominal), it delivers up to 504W at >91% efficiency in a standard half brick footprint. Patented Buck Reset topology with Sink-Plate technology ensures robust thermal performance without compromising power density.

200–420V High-Voltage Input

Bridges AC PFC front-end (380V nominal) directly to isolated DC output rails. 450V transient capability handles bus surges. Eliminates intermediate conversion stage for higher system efficiency.

Patented Sink-Plate Technology

Proprietary thermal management system with aluminum alloy base plate (anode oxide) and M3 stainless steel threaded inserts. 163g robust metal package with 3.0kV I/O isolation for demanding industrial and telecom environments.

Patented Buck Reset Topology

Proven switching architecture with efficient SR stage reduces power loss at every load point. Achieves >91% peak efficiency from 200–420V input — remarkably flat from 30% to 100% load.

N+1 Parallel with Current Share

Optional secondary current share bus (SCS pin, S-suffix) enables N+1 redundant parallel operation. Each additional unit increases output power — ideal for scalable power architectures requiring high availability.

3.0kV Isolation + Triple Protection

3.0kV input-to-output isolation — the highest in the product family. Over-current (108–125%), over-voltage (115–130%), and over-temperature (110°C Tc) protection. Input OVP at +435V max.

2.23M Hours MTBF

Bellcore TR-332 Issue 6 verified at GB/25°C (UH2H280abcd-N18XXX). Robust half brick construction with Sink-Plate thermal management for mission-critical infrastructure deployments.

Complete Model List

Available Configurations

All models share the same standard half brick footprint and 10-pin configuration with current share option. Input range: 200V–420Vdc (300V nominal / 380V PFC bus). Contact OneTech Integration for special input/output configurations.

Part Number	Input Range	Max Input Power	Output Voltage	Output Current	Max Output	Efficiency
UH2H480abcd-N10XXX	200V – 420V	554W	48.0V	10.5A	504W	91%
UH2H280abcd-N18XXX	200V – 420V	554W	28.0V	18.0A	504W	91%
UH2H120abcd-N42XXX	200V – 420V	554W	12.0V	42.0A	404W	91%

* Replace abcd with Enable Logic, Pin Length, Standoff Height codes. Suffix S enables secondary current share function. See Part Number System below.

Electrical Specifications

Complete Technical Parameters

All specifications are typical at nominal input, full load, 25°C unless otherwise noted.

Input

Operating Range	+200V to +420V DC
Transient (100ms)	450V Maximum
Turn-ON Threshold	+190V to +198V
Turn-OFF Threshold	+185V to +194V
Input OVP	+435V Max
Off-State Input Current	8 mA Max (at Vnom)
Latch-State Input Current	12 mA Max (at Vnom)
Reflected Ripple Current	30 mA rms / 200 mA p-p (L_ext = 20 µH)
Input Capacitance	4.7 µF Max
Input Ripple Rejection (<1 kHz)	−50 dB (Vnom, Full Load)

Remote Control

Logic High (Enable)	+3.0V to +6.5V
Logic Low (Disable)	0V to +1.0V
PC Pin Voltage Range	−0.5V to +12V DC
PC Pin Input Current	−0.5 mA to +1.5 mA

Output

Voltage Accuracy	±1.0% typical
Line Regulation	±0.3% (full input range)
Load Regulation	±0.3% (5% to 100% load)
Temperature Drift	±0.03%/°C (−40°C to 100°C)
Output Tolerance Band	±4% (all conditions)
Ripple & Noise (20 MHz)	3% p-p / 1% RMS of Vo
Over-Voltage Protection	115–130% Vo
Over-Current Limit	108–125% Io (at Vnom)
Voltage Trim Range	±10% Vo (at Vnom, 10% load)
Step Load Transient	±6% Vo / 500 µS (2.5 A/µS, 50–75% load)
Start-Up Delay	100 ms / 250 ms (Vnom, full load)

General

Switching Frequency	160 kHz typical
MTBF	2.23 × 10⁶ hrs (Bellcore TR-332 Issue 6, GB/25°C)
Over-Temp Protection	110°C (Tc) ±5°C
Operating Temperature	−40°C to +110°C
Storage Temperature	−55°C to +125°C
Input to Output Isolation	3.0 kV minimum
Input to Case Isolation	1.5 kV minimum
Output to Case Isolation	1.0 kV minimum
Weight (Metal Plate)	163 g

⚠ Absolute Maximum Ratings — Do Not Exceed

Input voltage: +190V to +420V DC operation, 450V max transient (100ms). Remote Control: −0.5V to +12V DC. Isolation: Input to Output 3.0kV, Input to Case 1.5kV, Output to Case 1.0kV. Exceeding absolute maximum ratings may permanently damage the device and void warranty.

Physical & Mechanical

Package & Pin Definitions

Standard half brick footprint with 10-pin configuration. Unique SCS (Secondary Current Share) pin enables N+1 redundant parallel operation. Aluminum alloy base plate with anode oxide surface and M3 stainless steel threaded inserts (4 pcs).

Input Side

1

−Vi

Negative Input

2

CASE

Connected to Base Plate

3

ON/OFF

Remote On/Off Control

4

+Vi

Positive Input

UH2H Series

Half Brick · Metal Plate Package

2.63" × 2.04" (66.8 × 51.8 mm)
Base: Al alloy, anode oxide

Output Side

5

+Vo

Positive Output

6

+S

Positive Remote Sense

7

TRIM

Output Voltage Trim ±10%

8

−S

Negative Remote Sense

9

SCS

Secondary Current Share Bus

10

−Vo

Negative Output

Pin Length Options (b-code)

0

0.12" / 3.05 mm

1

0.16" / 4.06 mm

2

0.20" / 5.08 mm

3

0.24" / 6.10 mm

Standoff height (c-code): 0 = 0.02", E = 1.0mm Metal Plate. Current share (d-code): N = without, S = secondary current share. Max torque on M3 inserts: 3.9 in-lb (0.44 Nm). Pin material: copper alloy or brass, gold over nickel plating.

TOLERANCESStandard dimensional tolerances apply unless otherwise specified.

Notation .xx (2 decimal)	±0.02 in (±0.5 mm)
Notation .xxx (3 decimal)	±0.01 in (±0.25 mm)
Base plate	Al alloy, anode oxide
Mounting inserts	M3 × 0.5 SS (4 pcs)
Max torque	3.9 in-lb (0.44 Nm)
Pin material	Cu alloy or Brass
Pin plating	Gold over Nickel

Weight (Metal Plate)

163g

1.0mm Aluminum Alloy Plate

Footprint

2.63" × 2.04"

(66.8 × 51.8 mm)

Metal Package — Mechanical Drawing

Half brick package. 1.0mm Al alloy base plate with M3 threaded inserts (4 plcs). Click for PDF.

Performance Data

Efficiency & Thermal Derating

Measured at nominal input, full output, 25°C. The UH2H280abcd-S18XXX (28V/18A) achieves 91.64% peak efficiency — remarkably flat from 30% to 100% load.

UH2H280abcE-S18XXX — Efficiency vs. Load (A)

200V input

270V input

400V input

Typical Waveforms — UH2H280abcd-S18XXX (V_IN: 270V, External CAP 100µF/100V)

Waveform Reference Page

Start-up · Transient Response · Input/Output Ripple · Efficiency · Derating — View full detail in PDF →

Derating & Power Loss — UH2H280abcE-S18XXX

Derating curves at Tc = 110°C and power loss — View in PDF →

Thermal Summary

OTP TriggerTc = 110°C ±5°C

Operation Range−40°C to +110°C

Base PlateAl alloy, anode oxide

Key Waveform Parameters

Start-Up Delay100 ms (Vnom, full load)

Step Load Recovery±6% Vo / 500 µS

Switching Frequency160 kHz typical

Isolation I/O3.0 kV min

Target Markets

Where UH2H Series Works Best

The UH2H's high-voltage input (200–420V), half brick power density, and current sharing capability make it the ideal isolated converter for AC/DC front-end and high-voltage bus architectures.

📡

Telecom Power Systems

380V PFC bus to 48V isolated rails. N+1 redundant parallel operation with SCS current share for high-availability telecom infrastructure.

🖥️

Data Center UPS

High-voltage DC bus distribution. 504W per module, parallel-stackable for scalable power. Robust 3.0kV isolation for critical server loads.

🏭

Industrial Power Systems

380V–420V industrial DC bus. Wide operating range handles rail fluctuations. Sink-Plate thermal management for harsh environments.

⚡

Railway & Transportation

200–400V battery bus compatible. High isolation and robust metal package for rolling stock and wayside equipment. −40°C cold start.

Part Number Builder

Configure Your Part Number

Build a valid UH2H part number using the selectors below. Submit the completed part number when requesting a quote.

Series

Output Voltage (0.1V)

Enable Logic

Pin Length

Standoff / Base Plate

Current Share

Generated Part Number

UH2H480P0EN00XXX

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