Name: U32 Series Micro Brick DC/DC Converter
Brand: OneTech Integration
Availability: InStock

Why U32 Series

Maximum Density, Minimum Footprint

The U32 Series redefines power density in the micro brick form factor. At just 0.9"×0.9" (22.86 × 15.24 mm), it delivers up to 120W with 414 W/in³ — the highest in its class. Patented Buck-reset Forward topology with synchronous rectification enables this remarkable density without compromising efficiency or reliability.

414 W/in³ Power Density

The highest power density in the micro brick class. Patented Buck-reset Forward topology combined with synchronous rectification delivers 120W from a 0.9"×0.9" footprint — no heatsink required in most applications.

Ultra-Compact 0.9"×0.9"

The industry's smallest high-power brick form factor. Multi-layer single-sided PCB design with metal-enclosed package options. Ideal for space-constrained board designs where every square millimeter matters.

Patented Buck-Reset Forward

Proprietary topology with efficient SR stage reduces power loss at every load point. Achieves >93% peak efficiency while maintaining flat efficiency from 10% to 100% load, directly reducing thermal stress and extending component life.

Triple Protection + Remote Sense

Over-current (108–125%), over-voltage (115–130%), and over-temperature (110°C Tc) protection with remote sense for accurate point-of-load regulation. Full protection without compromising responsiveness.

Remote On/Off Control

PC pin supports both positive and negative logic. Logic High (+3.0V to +6.5V) enables; Logic Low (0V to +1.0V) shuts down. Enables clean power sequencing in multi-rail designs without external sequencer ICs.

4.50M Hours MTBF

Bellcore TR-332 Issue 6 verified at GB/25°C (U3248050abcd-20XXX). Multi-layer single-sided PCB reduces solder joint count — addressing the leading causes of DC/DC converter field failures at the design level.

Complete Model List

Available Configurations

All models share the same 0.9"×0.9" micro brick footprint and pin-out. Select input bus (48V or 24V) and required output voltage. Contact OneTech Integration for 4:1 input range models or custom specifications.

Part Number	Input Range	Max Input Power	Output Voltage	Output Current	Max Output	Efficiency
U3248120abcd-XXXXX	36V – 75V	133W	12.0V	10A	120W	93%
U3248050abcd-XXXXX	36V – 75V	112W	5.0V	20A	100W	92%
U3248033abcd-XXXXX	36V – 75V	94W	3.3V	25A	83W	90%
U3248025abcd-XXXXX	36V – 75V	73W	2.5V	25A	63W	88%

Part Number	Input Range	Max Input Power	Output Voltage	Output Current	Max Output	Efficiency
U3224120abcd-XXXXX	18V – 36V	134W	12.0V	10A	120W	92%
U3224050abcd-XXXXX	18V – 36V	113W	5.0V	20A	100W	91%
U3224033abcd-XXXXX	18V – 36V	95W	3.3V	25A	83W	89%
U3224025abcd-XXXXX	18V – 36V	74W	2.5V	25A	63W	87%

* Contact OneTech Integration for 4:1 input range models, special input/output configurations, or custom output voltages. Part number suffix abcd encodes Enable Logic, Pin Length, Standoff Height, and Package Type.

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
24V Models Operating Range	+18V to +36V DC
18V Models Operating Range	+9V to +36V DC
48V/36V Transient (100ms)	100V / 75V Maximum
24V/18V Transient (100ms)	50V Maximum
48V Power-ON Threshold	+34.0V to +36.0V
24V/36V Power-ON Threshold	+17.0V to +18.0V
18V Power-ON Threshold	+8.5V to +9.0V
48V Power-OFF Threshold	+31.2V to +33.2V
24V/36V Power-OFF Threshold	+15.6V to +16.6V
18V Power-OFF Threshold	+7.8V to +8.3V
Off-State Input Current	6 mA Max (at Vnom)
Latch-State Input Current	8 mA Max (at Vnom)
Reflected Ripple Current	20 mA rms / 60 mA p-p (L_ext = 10 µH)
Input Capacitance (48V/36V)	14.0 µF Max
Input Capacitance (24V/18V)	20.0 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	±0.2% (full input range)
Load Regulation	±0.2% (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	20 ms / 250 ms (Vnom, full load)

General

Switching Frequency	400 kHz typical
MTBF	4.50 × 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	2.0 kV minimum
Input to Case Isolation	1.0 kV minimum
Output to Case Isolation	1.0 kV minimum
Weight (Open Frame)	9 g
Weight (Metal Enclosed)	20 g

⚠ Absolute Maximum Ratings — Do Not Exceed

Input voltage: −0.5V to +40V DC (24V/18V models) / −0.5V to +80V DC (48V/36V models). Transient (100ms): 50V max (24V/18V) / 100V max (48V/36V). Remote Control: −0.5V to +12V DC. Exceeding absolute maximum ratings may permanently damage the device and void warranty.

Physical & Mechanical

Package & Pin Definitions

Industry-standard sixteenth brick pin assignment in an ultra-compact 0.9"×0.9" micro brick footprint. 8-pin configuration supports remote sense (±S), trim (TRIM), and remote on/off control (PC). Available in Open Frame (9g) or Metal Enclosed (20g) packages.

Input Side

1

+IN

Positive Input

2

PC

Remote On/Off Control

3

−IN

Negative Input

U32 Series

Micro Brick · Open Frame / Metal Enclosed

0.90" × 0.60" (22.86 × 15.24 mm)
Pin: Copper alloy, Gold over Nickel

Output Side

4

−Vo

Negative Output

5

−S

Negative Remote Sense

6

TRIM

Output Voltage Trim ±10%

7

+S

Positive Remote Sense

8

+Vo

Positive Output

Pin Length Options (b-code in Part Number)

−

SMD (no pins)

0

0.12" / 3.05 mm

1

0.16" / 4.06 mm

2

0.20" / 5.08 mm

Standoff height (c-code): − = SMD, 0 = 0.02", 1 = 0.08", 2 = 0.16". Package (d-code): N = Open Frame / 0.35", E = Metal Enclosed / 0.40", M = Molding / 0.40". Pin material: copper alloy or brass with gold-over-nickel plating.

TOLERANCESStandard dimensional tolerances apply to all package dimensions unless otherwise specified.

Notation .xx (2 decimal)	±0.02 in (±0.5 mm)
Notation .xxx (3 decimal)	±0.01 in (±0.25 mm)
Unit system	Inches (millimeters)
Base-plate (Open Frame)	None
Base-plate (Metal Enclosed)	Non-conductive
Mounting inserts	None
Pin material	Copper alloy or Brass
Pin plating	Gold over Nickel

Weight

9g

Open Frame Package

Metal Enclosed

20g

Open Frame — Mechanical Drawing

Open Frame: 0.90" × 0.60" (22.86 × 15.24 mm). Weight: 9g. Click for PDF.

Metal Enclosed — Mechanical Drawing

Metal Enclosed: 1.03" × 0.60" (26.16 × 15.24 mm). Weight: 20g. Click for PDF.

Performance Data

Efficiency & Thermal Derating

Measured at nominal input, full output, 25°C. The U3224050N10N-20 (5V/20A) achieves maximum efficiency across a wide load range, simplifying thermal budgeting.

U3224050N10N-20 — Efficiency vs. Load Current (A)

36V input

48V input (nominal)

75V input

Typical Waveforms — U3224050N10N-20 (V_IN: 24V, T_A: 25°C)

Waveform Reference Page

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

Derating Curves — U3224050N10N-20

Derating at TOTP = 100°C and 125°C — View in PDF →

Thermal Summary — U3224050N10N-20

OTP TriggerTc = 110°C ±5°C

Operation Range−40°C to +110°C

Power Loss @ 20A/48V~6W (typical)

Key Waveform Parameters

Start-Up Delay20 ms (Vnom, full load)

Step Load Recovery±6% Vo / 500 µS

Output Ripple p-p3% Vo max

Output Ripple RMS1% Vo max

Switching Frequency400 kHz typical

Target Markets

Where U32 Series Works Best

The U32's ultra-compact 0.9"×0.9" micro brick footprint, 2:1 input range, and 414 W/in³ power density make it the ideal isolated converter for the most space-constrained designs.

📡

Telecom Base Stations

48V bus rails in compact BTS/RRU designs. 0.9"×0.9" footprint saves critical board space in densely populated telecom boards.

🖥️

Servers & Edge Computing

Point-of-load from 48V distribution in space-constrained edge servers and micro data center nodes. 414 W/in³ density enables denser layouts.

🔌

Networking Equipment

Switches, routers, and small-cell backhaul. The micro brick form factor fits where larger bricks cannot, without sacrificing output power.

🏭

Industrial Control

Wide input range, high MTBF (4.5M hrs), and robust isolation for compact industrial controllers and IoT gateways. No heatsink needed.

Part Number Builder

Configure Your Part Number

Build a valid U32 part number using the selectors below. Submit the completed part number when requesting a quote from OneTech Integration.

Series

Input Voltage

Output Voltage (0.1V)

Enable Logic

Pin Length

Standoff / Package

Generated Part Number

U3248120P−NXXXX

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