OneTech Integration · DC/DC Converters · Half Brick

UH Series

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

800W/67A isolated half brick DC/DC converter with patented Buck Reset topology and Sink-Plate technology. 219 W/in³ power density at up to 94% peak efficiency — the highest power half brick in our portfolio. Parallel-stackable with secondary current share for N+1 redundant architectures. Designed for high-power telecom, server, and industrial applications using a 48V input bus.

Half BrickUp to 94% Efficiency36–75V Input OCP · OVP · OTPSink-Plate TechnologyN+1 Current Share

View All Models Request Sample ↓ Download Datasheet PDF

800W

Max Output Power

219

W/in³ Power Density

94%

Peak Efficiency

Why UH Series

Maximum Power, Maximum Flexibility

The UH Series is the highest-power brick converter in the OneTech portfolio. Delivering up to 800W/67A at 94% efficiency from a standard half brick footprint, it redefines what's possible in board-mounted power. Patented Buck Reset topology with Sink-Plate thermal management and optional current share for N+1 redundancy make it the definitive choice for mission-critical infrastructure.

800W / 67A Maximum Output

The highest power in our brick converter family. Three output options — 48V/17A (816W), 28V/29A (812W), and 12V/67A (804W) — with 219 W/in³ power density in a standard half brick package.

Up to 94% Peak Efficiency

Patented Buck Reset topology with efficient SR stage delivers industry-leading efficiency. The UH48120 (12V/67A) achieves 93.69% peak at 48V — remarkably flat from 20% to 100% load, simplifying thermal design across the operating range.

Patented Sink-Plate Technology

Proprietary thermal management with multiple base-plate options: 1.0mm metal plate (87g), 3.0mm metal or sink-plate (94g), or 5.0mm sink-plate for extreme thermal environments. Aluminum alloy with anode oxide and M3 SS inserts.

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 available output power — ideal for scalable, high-availability power architectures requiring zero downtime.

Remote On/Off + 10-Pin Config

Standard 10-pin half brick interface with remote sense (±S), voltage trim, and secondary current share (SCS) bus. PC pin supports positive or negative logic for flexible power sequencing in multi-rail designs.

2.51M Hours MTBF

Bellcore TR-332 Issue 6 verified at GB/25°C (UH48280abcd-N29XXX). Rugged half brick construction with Sink-Plate thermal management for mission-critical telecom and data center deployments.

Complete Model List

Available Configurations

All models share the same standard half brick footprint and 10-pin configuration. Input range: 36V–75Vdc (48V nominal). Contact OneTech Integration for 24V input models or custom output voltages.

Part Number	Input Range	Max Input Power	Output Voltage	Output Current	Max Output	Efficiency
UH48480abcd-N17XXX	36V – 75V	887W	48.0V	17A	816W	93%
UH48280abcd-N29XXX	36V – 75V	883W	28.0V	29A	812W	93%
UH48120abcd-N67XXX	36V – 75V	874W	12.0V	67A	804W	94%

* Replace abcd with Enable Logic, Pin Length, Standoff Height, Base-Plate codes. Suffix S enables secondary current share function. See Part Number System for full code definitions.

Electrical Specifications

Complete Technical Parameters

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

Input

48V Models Operating Range	+36V to +75V DC
Transient (100ms)	100V Maximum
Power-ON Threshold	+34.0V to +36.0V
Power-OFF Threshold	+31.2V to +33.2V
Off-State Input Current	6 mA Max (at Vnom)
Latch-State Input Current	8 mA Max (at Vnom)
Reflected Ripple Current	50 mA rms / 200 mA p-p (L_ext = 10 µH)
Input Capacitance	22.0 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% (0% 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	50 ms / 250 ms (Vnom, full load)

General

Switching Frequency	330 kHz typical
MTBF	2.51 × 10⁶ hrs (Bellcore TR-332, 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	2.0 kV minimum
Input to Case Isolation	1.0 kV minimum
Output to Case Isolation	1.0 kV minimum
Weight (1.0mm Metal Plate)	87 g
Weight (3.0mm Sink Plate)	94 g

⚠ Absolute Maximum Ratings — Do Not Exceed

Input voltage: −0.5V to +80V DC (48V models). Transient (100ms): 100V max. Remote Control: −0.5V to +12V DC. 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. SCS (Secondary Current Share) pin enables N+1 redundant parallel operation. Multiple base-plate options from 1.0mm metal to 5.0mm sink-plate for optimized thermal management.

Input Side

−Vi

Negative Input

CASE

Connected to Base Plate

ON/OFF

Remote On/Off Control

+Vi

Positive Input

UH Series

Half Brick · Sink-Plate Package

2.46" × 2.04" (62.5 × 51.8 mm)
Base: Al alloy, anode oxide

Output Side

+Vo

Positive Output

Positive Remote Sense

TRIM

Output Voltage Trim ±10%

−S

Negative Remote Sense

SCS

Secondary Current Share Bus

−Vo

Negative Output

Base-Plate Options (d-code)

1.0mm Metal / 0.46"

3.0mm Metal / 0.54"

3.0mm Sink / 0.54"

5.0mm Sink / 0.62"

Max torque on M3 inserts: 3.9 in-lb (0.44 Nm). Pin material: copper alloy or brass, gold over nickel plating. Current share (dash code): N = without, S = secondary.

TOLERANCESStandard dimensional tolerances 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 Options

87g

1.0mm Metal Plate

3.0mm Sink Plate

94g

Mechanical Drawing

Full half brick package drawing — click to view in PDF. Base plate: Al alloy with anode oxide. M3 threaded inserts (4 plcs). Dimensions in inches [mm].

Performance Data

Efficiency & Thermal Derating

Measured at nominal input, full output, 25°C. The UH48120 (12V/67A) achieves 93.69% peak efficiency at 48V — among the highest for any half brick in this power class.

UH48120abcB-N50XXX — Efficiency vs. Load (A)

36V input

48V input (nominal)

75V input

Typical Waveforms — UH48280P20S-S29 (V_IN: 48V)

Waveform Reference Page

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

Derating Curves — UH48280P20S-S29

Derating curves at Tc = 100°C and 120°C — View in PDF →

Thermal Summary

OTP Trigger110°C ±5°C

Operation−40°C to +110°C

Switching Freq330 kHz

Key Parameters

Start-Up50ms / 250ms

Step Load±6% / 500µS

Isolation I/O2.0 kV

Target Markets

Where UH Series Works Best

The UH Series' 800W output, 94% efficiency, and N+1 current share capability make it the ideal high-power building block for the most demanding infrastructure applications.

📡

Telecom BTS

48V bus to 28V/12V rails. N+1 redundant with SCS. 94% efficiency reduces cooling requirements in outdoor cabinets.

🖥️

Data Center

High-density server racks. 12V/67A delivers dense point-of-load power. Parallel-stackable for scalable architecture.

🏭

Industrial Power

48V industrial bus. Sink-Plate thermal for harsh environments. 2.51M hrs MTBF for minimum downtime.

⚡

Defense & Aerospace

High-reliability power for radar, communications. Robust isolation and wide temp range. Sink-Plate for conducted cooling.

UH Series

Maximum Power, Maximum Flexibility

Available Configurations

Complete Technical Parameters

Package & Pin Definitions

Efficiency & Thermal Derating

Where UH Series Works Best

Ready to Specify the UH Series?