Industry First · Hex-Brick

E32 SERIES

Hex-Brick DC/DC Converter

The industry-first Hex-Brick isolated DC/DC converter — 230W from 18–36V or 36–75V input. Engineered for deep-water probes (1 mBar to 100 Bar), high-altitude instruments, defense systems, and harsh industrial equipment. −60°C to +130°C. Patented Buck-Reset Forward topology.

OCP · OVP · OTP Remote ON/OFF Voltage Trim ±10% Remote Sense −60°C to +130°C 100 Bar Pressure 60 nS Ultra-fast OCP Droop Current Share RoHS · CE Approved

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$E32 Series Hex-Brick DC/DC Converter module$

Target Applications

🌊

Deep Water Probes

Vacuum-potted metallic case rated from 1 mBar to 100 Bar pressure. Double-side M2 screw mount.

🛩️

High Altitude Instruments

Full −60°C operating capability. Works from near-vacuum to sea level without derating.

🛡️

Defense & Military

Harsh vibration and shock. Full metal package. Operable in extreme dust and temperature.

⚙️

Industrial Extreme

Sealed anodized aluminum alloy. 4.80M hrs MTBF. Reliable in corrosive environments.

⚡

Parallel Power Systems

Droop Current Sharing — direct parallel without share bus. 3× E3248120a = 360W / 12V.

🔌

Non-Ohmic Loads

60 nS ultra-fast OCP eliminates Short-Circuit-Current-Runaway. Capacitive, inductive, arc loads.

Model List

48V Bus Series — 36V ~ 75V Input

Part Number	Input	Vout	Iout	Pout	Eff.
E3248050a	36-75V	5.0V	25A	125W	92%
E3248120a	36-75V	12.0V	10A	120W	94%
E3248240a	36-75V	24.0V	5A	120W	93%

24V Bus Series — 18V ~ 36V Input

Part Number	Input	Vout	Iout	Pout	Eff.
E3224050a	18-36V	5.0V	25A	125W	91%
E3224120a	18-36V	12.0V	10A	120W	93%
E3224240a	18-36V	24.0V	5A	120W	92%

* Contact OneTech Integration for special input/output configurations. Factory Part Code required for all E32 orders.

Output Capacitive Load & Short Circuit Limits

Part Number	Max Cap Load	Pre-bias V_B	Reverse I_B	Short Circuit I_S
E3224050a / E3248050a	<10,000 µF @ 200 mΩ	<4.75V	<100mA	<50A @ 2mΩ
E3224120a / E3248120a	<1,000 µF @ 1,200 mΩ	<11.4V	<100mA	<25A @ 2mΩ
E3224240a / E3248240a	<330 µF @ 4,800 mΩ	<22.8V	<100mA	<10A @ 2mΩ

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 Current6 mA Max (at Vnom)

Reflected Ripple Current20 mA rms / 60 mA p-p

Input Capacitance (48V)14.0 µF Max

Input Capacitance (24V)20.0 µF Max

Ripple Rejection (<1 kHz)−50 dB (Vnom, Full Load)

Remote Control

Logic High — Enable+3.0V to +6.5V

Logic Low — Disable0V to +1.0V

PC Pin Voltage Range−0.5V to +12V DC

PC Pin Input Current−0.5 mA to +1.5 mA

Positive Logic (P)High = Output ON

Negative Logic (N)Low = Output ON

Isolation Voltage

Input to Output2.0 kV Minimum

Input to Case1.0 kV Minimum

Output to Case1.0 kV Minimum

Output

Voltage Accuracy±1.0% typical

Line Regulation±0.2% (full range)

Load Regulation±0.2% (10–100% load)

Temperature Drift±0.03%/°C (−60 to +130°C)

Output Tolerance Band±4% (all conditions)

Ripple & Noise (20 MHz)3% p-p / 1% RMS of Vo

Over-Voltage Protection115–130% Vo

Over-Current Limit120–140% Io (at Vnom)

Voltage Trim Range±10% Vo (Vnom, 10% load)

Step Load (2.5 A/µS)±6% Vo / 500 µS

Start-Up Delay20 ms / 250 ms (full load)

General & Mechanical

Switching Frequency480 kHz typical

MTBF (Bellcore TR-332 #6)4.80×10⁶ hrs @ GB/25°C

OTP Trip Point130°C (Tc) ±5°C (Default)

Weight16 g

Dimensions (L × W × H)25.49 × 26.50 × 11.00 mm

Base PlateAnodized aluminum alloy

Pin PlatingGolden over Nickel

Pressure Rating1 mBar to 100 Bar

Max Input (24V Abs.)−0.5V to +40V DC

Max Input (48V Abs.)−0.5V to +80V DC

Operating Temperature−60°C to +130°C

Storage Temperature−60°C to +155°C

⚠ WARNING — Do not exceed absolute maximum ratings. Exceeding these limits may permanently damage the device and voids warranty. Always protect input with a fuse.

Protection Features

OCP — 60 nS

Ultra-fast current limit eliminates Short-Circuit-Current-Runaway. Effective for non-Ohmic, capacitive, and inductive loads.

OVP

115–130% Vo latching protection. Recover by cycling input power or toggling PC pin.

OTP

130°C case temperature trip (±5°C). Auto-restart on cool-down. Default setting for E32 series.

Remote ON/OFF

Positive or Negative logic selectable. Open-collector NPN transistor or mechanical switch drive.

Part Number System & Ordering

Part Number System

E32

Series

24/48

Input Voltage

050/120/240

Output Voltage

P / N

Enable Logic

XYZ

Part Code

Field	Code	Description
Input	24	18V~36V (24V bus)
	48	36V~75V (48V bus)
Output	050	5.0V / 25A
	120	12.0V / 10A
	240	24.0V / 5A
Enable	N	Negative Logic (0V–1V = ON)
	P	Positive Logic (+3V–6.5V = ON)
Part Code	XYZ	Factory-issued — required

Example: E3248120N — 48V input · 12.0V/10A output · Negative enable logic

Important Notes

! Input MUST be protected by fuses or overcurrent protection device.
i A factory Part Code is required — model number alone is insufficient for ordering.
i All specifications at nominal input, full load, 25°C unless otherwise noted.
i Specifications subject to change without notice.
i Not for life-critical, nuclear, or hazardous system applications.
i Contact OneTech Integration for custom configurations or special I/O.
i Do not cut pins, remove potting, or modify without written consent.
i Remote sense compensates max 0.5V. Exceeding may cause instability.
i Trim range beyond ±10% available — contact OneTech Integration.

PCB Pad Specifications

Pin Type	Hole	Pad	Via Req.
1.0mm Pins (×6)	1.25mm	2.0mm min	4–8 × 0.5mm vias
1.5mm Pins (×2)	1.80mm	3.0mm min	4–8 × 0.5mm vias