Name: COE Series Eighth Brick DC/DC Converter
Brand: OneTech Integration
Availability: InStock

Why COE Series

More Power, Less Space —
Two Package Options

The COE Series delivers the highest power density available in a standard eighth brick footprint. Patented Buck Reset topology and synchronous rectification achieve industry-leading efficiency, while Sink-Plate and Enclosed options let system designers choose the thermal management approach that fits their environment.

175 W/in³ Power Density

Industry-leading power density for an eighth brick. Patented Buck Reset switching eliminates losses that conventional topologies accept as unavoidable — delivering more watts per cubic inch than any comparable isolated module.

Sink-Plate Technology

Integrated heat-spreading plate options (1.0mm Metal, 3.0mm Metal, 3.0mm Sink-Plate, 5.0mm Sink-Plate) enable conduction cooling directly to the chassis — eliminating the need for external heatsinks in many applications.

SR Stage + Buck Reset

Synchronous rectification at the output combined with the patented Buck Reset topology reduces conduction and switching losses simultaneously — a dual-optimization that competitors typically achieve only one at a time.

Full Protection Suite

OCP (108–125%), OVP (115–130%), and OTP (110°C Tc) provide comprehensive protection. Remote on/off supports both positive and negative logic for clean sequencing in multi-rail designs.

Industry Standard Pinout

Compatible with industry-standard eighth brick pin assignment. Drop-in replacement for existing designs — no PCB modifications required when upgrading from lower-efficiency modules.

4.80M Hours MTBF

Bellcore TR-332 Issue 6 verified. Multi-layer single-sided PCB design minimizes solder joint count and hot spots — the primary failure mechanisms in power modules under long-term operational stress.

Six-Sided Metal Package

High thermal conductivity silicone-potted six-sided metal enclosure designed for applications under extreme environmental conditions — humidity, vibration, and contamination that would degrade open-frame modules.

102 W/in³ Enclosed Density

Despite full enclosure, the Enclosed COE achieves 102 W/in³ — one of the highest power densities available in a fully potted eighth brick. Metal-plate technology maintains thermal performance without heatsink attachments.

Extreme Environment Ready

Silicone potting protects against moisture ingress, condensation, and particulate contamination. Suitable for outdoor telecom infrastructure, defense systems, and industrial environments where open-frame designs are not viable.

Same Pin Assignment

Identical eighth brick pin-out as the Open Frame version. System designers can specify Open Frame for benign environments and Enclosed for harsh ones — using the same PCB layout throughout the product family.

Identical Electrical Specs

Enclosed version shares the same electrical specification as Open Frame — same output accuracy (±1%), same line/load regulation (±0.2%), same protection thresholds. Only the mechanical package changes.

4.80M Hours MTBF

Same Bellcore TR-332 Issue 6 rating as Open Frame. Potting adds mechanical protection without reducing reliability — silicone compound is stable from −40°C to +125°C with no degradation over time.

Complete Model List

Available Configurations

Both Open Frame and Enclosed versions share the same electrical model list. Select package type, input bus, and output voltage. Contact OneTech Integration for custom voltages or current ratings.

Part Number	Input Range	Max Input	Output Voltage	Output Current	Max Output	Efficiency
COE48120abcd-11XXX	36–75V	145W	12.0V	11A	132W	92%
COE48070abcd-18XXX	36–75V	138W	7.0V	18A	126W	91%
COE48050abcd-25XXX	36–75V	138W	5.0V	25A	125W	91%
COE48033abcd-30XXX	36–75V	111W	3.3V	30A	99W	90%
COE48025abcd-40XXX	36–75V	114W	2.5V	40A	100W	89%
COE48018abcd-50XXX	36–75V	106W	1.8V	50A	90W	87%
COE48015abcd-50XXX	36–75V	90W	1.5V	50A	75W	85%

Part Number	Input Range	Max Input	Output Voltage	Output Current	Max Output	Efficiency
COE24120abcd-10XXX	18–36V	133W	12.0V	10A	120W	92%
COE24050abcd-25XXX	18–36V	139W	5.0V	25A	125W	91%
COE24033abcd-30XXX	18–36V	111W	3.3V	30A	99W	90%
COE24025abcd-40XXX	18–36V	114W	2.5V	40A	100W	89%
COE24018abcd-50XXX	18–36V	106W	1.8V	50A	90W	87%
COE24015abcd-50XXX	18–36V	90W	1.5V	50A	75W	85%

* Both Open Frame and Enclosed packages use the same part number system. Specify base-plate code (d) to select package type. Contact OneTech Integration for special configurations.

Electrical Specifications

Complete Technical Parameters

All specifications typical at nominal input, full load, 25°C unless otherwise noted. Open Frame and Enclosed versions share identical electrical specifications.

Input

48V Operating Range	+36V to +75V DC
24V Operating Range	+18V to +36V DC
48V Transient (100ms)	100V Maximum
24V Transient (100ms)	50V Maximum
48V Power-ON Threshold	+34.0V to +36.0V
24V Power-ON Threshold	+17.0V to +18.0V
48V Power-OFF Threshold	+31.2V to +33.2V
24V Power-OFF Threshold	+15.6V to +16.6V
Off-State Input Current	6 mA Max (Vnom)
Latch-State Input Current	8 mA Max (Vnom)
Reflected Ripple Current	20 mA rms / 60 mA p-p (Lext=10µH)
Input Cap. 48V Models	10.0 µF Max
Input Cap. 24V Models	22.0 µF Max
Ripple Rejection (<1kHz)	−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

Isolation Voltage

Input to Output	2.0 kV Minimum
Input to Case	1.0 kV Minimum
Output to Case	1.0 kV Minimum

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 (Vnom, 10% load)
Step Load (2.5 A/µS)	±6% Vo / 500 µS
Start-Up Delay	20 ms / 250 ms (Vnom, full load)

General

Switching Frequency	330 kHz typical
MTBF (Bellcore TR-332 #6)	4.80 × 10⁶ hrs @ GB/25°C
OTP Trip Point	110°C (Tc) ±5°C
Operating Temperature	−40°C to +110°C
Storage Temperature	−55°C to +125°C

Weight by Package

Open Frame — 1.0mm Metal	27 g
Open Frame — 3.0mm Metal	32 g
Enclosed — 3.0mm Metal	55 g
Enclosed — 5.0mm Metal	65 g

⚠ Absolute Maximum Ratings — Do Not Exceed

Input voltage: −0.5V to +40V DC (24V models) / −0.5V to +80V DC (48V models). Remote Control pin: −0.5V to +12V DC. Operating: −40°C to +110°C. Storage: −55°C to +125°C. Exceeding limits may permanently damage the device and void warranty.

Physical & Mechanical

Package & Pin Definitions

Industry-standard eighth brick pin assignment. Both Open Frame and Enclosed versions use identical pin functions. Gold-over-Nickel plated copper alloy or brass pins.

Input Side

1

−IN

Negative Input

2

PC

Remote On/Off Control

3

+IN

Positive Input

COE Series

Eighth Brick · Open Frame / Enclosed

2.00" × 0.90" (50.8 × 22.86 mm)
Base plate: Aluminum alloy with anode oxide

Output Side

4

+Vo

Positive Output

5

+S

Positive Remote Sense

6

TRIM

Output Voltage Trim ±10%

7

−S

Negative Remote Sense

8

−Vo

Negative Output

Pin Length Options (b-code)

0

0.12" / 3.05mm

1

0.16" / 4.06mm

2

0.20" / 5.08mm

3

0.24" / 6.10mm

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	Aluminum alloy with anode oxide
Mounting inserts	M3 × 0.5 stainless steel (2 plcs)
Max torque	3.9 in‑lb (0.44 Nm)
Pin material	Copper alloy or Brass
Pin plating	Golden over Nickel

Weight (Open Frame)

27g / 32g

1.0mm / 3.0mm metal plate

Weight (Enclosed)

55g / 65g

3.0mm / 5.0mm metal plate

Mechanical Drawings

Open Frame Package

Enclosed Metal Package

All dimensions in inches (millimeters) · Tolerances: .xx ±0.02 in (±0.5mm) · .xxx ±0.01 in (±0.25mm)

Performance Data

Efficiency, Waveforms &
Thermal Derating

All measurements at nominal input voltage and 25°C ambient unless noted. The COE48050 achieves 92.28% peak efficiency at 48V input — remarkably flat from 12.5A through 25A.

Typical Waveforms — COE48050abcd-25XXX (V_IN: 50V)

Start-Up Waveform

V_IN: 50V · Load: 25A

Ch1: Output VoltageCh1 High: 5.88V

Transient Response

Load: 12.5A → 5.0A @ 2.5A/μS

Recovery within 500 μS±6% Vo

Input / Output Ripple

V_IN: 50V · Load: 25A · L_IN=10μH

Output p-p: 186mVRMS: 23.68mV

COE48050abcd-25XXX — Efficiency vs. Load Current (A)

36V input

48V input (nominal)

75V input

Thermal Derating Curves — Iout (A) vs Ambient Temperature (Tc = 110°C)

COE48050 — 400/300/200/100/20 LFM

Open Frame · Max 25A @ 48V input

COE48033 — 400/300/200/100/20 LFM

Open Frame · Max 30A @ 48V input

Thermal Summary — COE48050 (Open Frame)

20 LFMFull 25A to ~60°C ambient

100 LFMFull 25A to ~80°C ambient

200 LFMFull 25A to ~90°C ambient

400 LFMFull 25A to ~100°C ambient

OTP TriggerTc = 110°C ±5°C

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 Frequency330 kHz typical

Target Markets

Where COE Series Works Best

The COE's 50A output capability, ultra-high power density, and dual package availability make it ideal for high-density point-of-load applications where space is at a premium.

📡

Telecom Infrastructure

48V bus in BTS, RRU, and C-RAN. High current output drives low-voltage ASICs and FPGAs directly without intermediate rail.

🖥️

Servers & ASIC Power

50A capability powers high-current processor rails. 92%+ efficiency reduces datacenter cooling burden and operating cost.

🔌

Networking Equipment

High-density switching and routing platforms. Multiple COE modules in parallel enable scalable current delivery.

🏭

Industrial & Defense

Enclosed package option for harsh environments. −40°C cold-start, silicone potting for moisture and vibration resistance.

Part Number Builder

Configure Your Part Number

Build a valid COE part number. Note: Base-Plate code (d) determines Open Frame vs Enclosed package. Submit when requesting a quote from OneTech Integration.

Series

Input Voltage Bus

Output Voltage

Enable Logic (a)

Pin Dimension (b)

Standoff Height (c)

Base-Plate / Package (d)

Output Current Rating

Generated Part Number

COE48120P00M-11XXXX

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