Name: U16 Series 1/16 Brick DC/DC Converter
Brand: OneTech Integration
Availability: InStock

Why U16 Series

Engineering That Eliminates Compromise

The U16 Series was designed for power architects who need maximum output in the compact 1/16 brick footprint — without sacrificing efficiency or reliability. Proprietary Buck-reset Forward topology, synchronous rectification, and a multi-layer single-sided PCB combine to deliver telecom-grade performance with industry-leading power density.

Patented Buck-Reset Forward

Proprietary topology reduces power loss at every load point. Combined with synchronous rectification (SR), achieves 405 W/in³ power density — the highest in its class for 1/16 brick form factor.

Multi-Layer PCB Design

Multi-layer single-sided circuit board combined with a fully metal-enclosed package enhances thermal performance and improves reliability. Available in Open Frame (11g) or Metal Enclosed (28g) packages.

Synchronous Rectification

SR stage at the output replaces diode conduction loss with a low-resistance MOSFET switch. Combined with Buck-Reset Forward, this directly contributes 1–2% efficiency gain versus conventional isolated converter architectures.

Triple Protection + Remote Sense

Over-current (108–125%), over-voltage (115–130%), and over-temperature (110°C Tc) protection with remote sense (±S pins) for accurate point-of-load regulation. No trade-off between protection and precision.

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 (U1648050abcd-25XXX). Multi-layer single-sided PCB reduces solder joint count — addressing the two leading causes of DC/DC converter field failures at the design level.

Complete Model List

Available Configurations

All models share the same 1/16 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
U1648120abcd-XXXXX	36V – 75V	186W	12.0V	14A	168W	93%
U1648050abcd-XXXXX	36V – 75V	168W	5.0V	30A	150W	92%
U1648033abcd-XXXXX	36V – 75V	132W	3.3V	35A	115W	90%
U1648025abcd-XXXXX	36V – 75V	102W	2.5V	35A	88W	88%

Part Number	Input Range	Max Input Power	Output Voltage	Output Current	Max Output	Efficiency
U1624120abcd-XXXXX	18V – 36V	161W	12.0V	12A	144W	92%
U1624050abcd-XXXXX	18V – 36V	141W	5.0V	25A	125W	91%
U1624033abcd-XXXXX	18V – 36V	115W	3.3V	30A	99W	89%
U1624025abcd-XXXXX	18V – 36V	89W	2.5V	30A	75W	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. Test conditions per industry standard for isolated DC/DC brick converters.

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)	11 g
Weight (Metal Enclosed)	28 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. 8-pin configuration supports remote sense (±S), trim (TRIM), and remote on/off control (PC). Available in Open Frame, Metal Enclosed, and Molding packages with Through-hole or SMD pin options.

Input Side

1

+IN

Positive Input

2

PC

Remote On/Off Control

3

−IN

Negative Input

U16 Series

1/16 Brick · Open Frame / Metal Enclosed

1.30" × 0.60" (33.02 × 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.

TOLERANCES Standard 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

11g

Open Frame Package

Metal Enclosed

28g

Open Frame — Mechanical Drawing

Open Frame dimensions. Click for full PDF detail. 1.30" × 0.60" (33.02 × 15.24 mm). Weight: 11g.

Metal Enclosed — Mechanical Drawing

Metal Enclosed dimensions. Click for full PDF detail. 1.10" × 0.60" (27.94 × 15.24 mm). Weight: 28g.

Performance Data

Efficiency & Thermal Derating

Measured at nominal input, full output, 25°C. The U1648033N10E-20 (3.3V/20A) achieves maximum efficiency across a wide load range, simplifying thermal budgeting across the load profile.

U1648033N10E-20 — Efficiency vs. Load Current (A)

28V input

36V input

48V input (nominal)

60V input

Typical Waveforms — U1648033N10E-20 (V_IN: 36V, T_A: 25°C)

Waveform Reference Page

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

Derating Curves — U1648033N10E-20

Derating at Tc = 95°C and 115°C — View in PDF →

Thermal Summary — U1648033N10E-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 U16 Series Works Best

The U16's compact 1/16 brick form factor, 2:1 input range, high efficiency, and telecom-grade isolation make it the ideal isolated converter for space-constrained infrastructure designs.

📡

Telecom Base Stations

48V bus rails in BTS and RRU. 405 W/in³ density saves board space. 2kV I/O isolation for outdoor telecom enclosures.

🖥️

Servers & Data Center

Point-of-load from 48V distribution. U1648120 delivers 12V/14A with >93% efficiency — ideal for server power architecture.

🔌

Networking Equipment

Compact 1/16 brick fits space-constrained switch and router designs. Remote sense enables accurate point-of-load regulation.

🏭

Industrial Control

Wide input range, high MTBF (4.5M hrs), and robust isolation for factory automation and control systems. No heatsink needed.

Part Number Builder

Configure Your Part Number

Build a valid U16 part number using the selectors below. Submit the completed part number when requesting a quote from OneTech Integration. Reference the Part Number System table above for full code definitions.

Series

Input Voltage

Output Voltage (0.1V units)

Enable Logic

Pin Length

Standoff / Package

Generated Part Number

U1648120P−NXXXX

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