OneTech Integration · DC/DC Converters · Half Brick

NH Series

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

Up to 336W / 21A in an industry-standard half brick package. Efficient Non-SR technology with ultra-low leakage inductance magnetics delivers "SR-like" conversion efficiency. Sink-Plate technology for enhanced thermal performance. Ideal for telecom, servers, networking.

Half Brick336W Max24V/48V Input OCP · OVP · OTPSink-Plate4.11M hrs MTBF

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336W

Max Output Power

21A

Max Output Current

>90%

Peak Efficiency

Why NH Series

Half Brick Power, Full Brick Reliability

The NH Series delivers up to 336W / 21A in a standard half brick footprint. Its proprietary Non-SR technology combined with ultra-low leakage inductance magnetics achieves "SR-like" efficiency without the complexity of synchronous rectification. Multi-layer single-sided PCB plus optional Sink-Plate technology enhance thermal performance and long-term reliability.

336W / 21A Maximum Output

Up to 336W in a standard half brick. 48V bus models deliver 48V/7A (336W), 28V/11A (308W), 24V/12A (288W) and 12V/21A (252W). 24V input versions also available for 18–36V bus systems.

Non-SR Technology

Patented Non-SR topology with ultra-low leakage inductance magnetics achieves >90% efficiency — comparable to synchronous rectification — with fewer components, lower cost, and proven reliability.

Sink-Plate Technology

Optional 3.0mm (code A) and 5.0mm (code B) Sink-Plate options dramatically improve thermal derating performance. Use as integrated heatsink — no additional cooling assembly needed.

2.0kV Isolation + Triple Protection

2.0kV input-to-output isolation with OCP (108–125%), OVP (115–130%), and OTP (110°C Tc). Robust protection for telecom infrastructure and industrial applications.

4.11M Hours MTBF

Bellcore TR-332 Issue 6 verified at GB/25°C. Multi-layer single-sided PCB design plus Sink-Plate thermal management for exceptional field reliability.

Open Frame & Metal Enclosed

Choose between lightweight open frame (60g) or metal enclosed (95g). Both share same footprint and pinout for drop-in compatibility. Sink-Plate options for demanding thermal environments.

Complete Model List

Available Configurations

All models share the standard half brick footprint with 9-pin configuration. Input range: 36–75V (48V bus) or 18–36V (24V bus). Contact OneTech Integration for special input/output configurations.

Part Number	Input Range	Max Input	Output	Current	Max Output	Efficiency
NH48480abcd-07XXX	36V – 75V	378W	48.0V	7.0A	336W	89%
NH48280abcd-11XXX	36V – 75V	342W	28.0V	11A	308W	90%
NH48240abcd-12XXX	36V – 75V	323W	24.0V	12A	288W	89%
NH48240abcd-07XXX	36V – 75V	174W	24.0V	6.5A	156W	90%
NH48120abcd-21XXX	36V – 75V	280W	12.0V	21A	252W	90%

Part Number	Input Range	Max Input	Output	Current	Max Output	Efficiency
NH24480abcd-07XXX	18V – 36V	381W	48.0V	7.0A	336W	88%
NH24280abcd-11XXX	18V – 36V	342W	28.0V	11A	308W	90%
NH24240abcd-12XXX	18V – 36V	323W	24.0V	12A	288W	89%
NH24120abcd-21XXX	18V – 36V	280W	12.0V	21A	252W	90%

* Replace abcd with Enable Logic, Pin Length, Standoff, and Base-Plate codes. Contact OneTech Integration for special configurations.

Electrical Specifications

Complete Technical Parameters

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

Input

Operating Range (48V)	+36V to +75V DC
Operating Range (24V)	+18V to +36V DC
Transient 48V (100ms)	100V Maximum
Transient 24V (100ms)	50V Maximum
Power-ON 48V	+34.0V to +36.0V
Power-ON 24V	+17.0V to +18.0V
Power-OFF 48V	+31.2V to +33.2V
Power-OFF 24V	+15.6V to +16.6V
Off-State Current	6 mA Max
Latch-State Current	8 mA Max
Reflected Ripple	30 mA rms / 100 mA p-p
Input Cap (48V)	15.0 µF Max
Input Cap (24V)	42.0 µF Max
Ripple Rejection (<1kHz)	-50 dB

Remote Control

Logic High	+3.0V to +6.5V
Logic Low	0V to +1.0V
PC Pin Range	−0.5V to +12V DC
PC Pin Current	−0.5 mA to +1.5 mA

Output

Voltage Accuracy	±1.0%
Line Regulation	±0.3%
Load Regulation	±0.3% (2%~100%)
Temp Drift	±0.03%/°C
Tolerance Band	±4%
Ripple/Noise (20MHz)	3% p-p / 1% RMS
OVP	115–130% Vo
Current Limit	108–125%
Trim Range	±10%
Step Load	±6% Vo / 500µS
Start-Up Delay	20ms / 250ms

General

Switching Freq	340 kHz
MTBF (Bellcore)	4.11 × 10⁶ hrs
OTP	110°C (Tc) ±5°C
Operating Temp	−40°C to +110°C
Storage Temp	−55°C to +125°C
Isolation I/O	2.0 kV min
I/Case, O/Case	1.0 kV min
Weight (Open Frame)	60 g
Weight (Metal Enclosed)	95 g

⚠ Absolute Maximum Ratings — Do Not Exceed

Input 48V: −0.5V to +80V DC (100V transient). Input 24V: −0.5V to +40V DC (50V transient). 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 9-pin configuration. Available in open frame (60g) or metal enclosed (95g) packages. Base plate options: 1.0mm metal plate, 3.0mm Sink-Plate, or 5.0mm Sink-Plate.

Input Side

−Vi

Negative Input

CASE

Connected to Base Plate

ON/OFF

Remote On/Off Control

+Vi

Positive Input

NH Series

Half Brick · 9-Pin

Open Frame / Metal Enc.
24V or 48V Input Bus

Output Side

+Vo

Positive Output

Positive Remote Sense

TRIM

Output Trim ±10%

−S

Negative Remote Sense

−Vo

Negative Output

Pin Length Options (b-code)

0.12" / 3.05mm

0.16" / 4.06mm

0.20" / 5.08mm

0.24" / 6.10mm

Standoff Height Options (c-code)

0.02" / 0.51mm

0.08" / 2.03mm

0.16" / 4.06mm

Max torque: 3.9 in-lb (0.44 Nm). Pin: Cu alloy/Brass, gold over nickel. M3 × 0.5 threaded inserts (4 plcs).

TOLERANCES Standard dimensional tolerances apply.

Notation .xx	±0.02 in (±0.5mm)
Notation .xxx	±0.01 in (±0.25mm)
Base plate	Al alloy, anode oxide
Mounting	M3 × 0.5 SS (4 plcs)
Max torque	3.9 in-lb (0.44Nm)
Pin material	Cu alloy or Brass
Pin plating	Gold over Nickel

Weight

60g

Open Frame

95g Metal Enclosed

Metal Enclosed — Mechanical Drawing

Half brick metal enclosed. Click for PDF. Weight: 95g. Dimensions: 2.40" × 2.04" (61.0 × 51.82 mm).

Open Frame — Mechanical Drawing

Open frame. Click for PDF. Weight: 60g. Sink-Plate options available.

Performance Data

Efficiency & Thermal Performance

Measured at nominal input, full output, 25°C. NH48240 and NH48120 achieve up to 90% efficiency with flat response from 20% to 100% load.

Efficiency & Derating Curves — NH Series

Efficiency vs. load and derating curves — View in PDF →

Thermal Summary

OTP110°C ±5°C

Operation−40°C to +110°C

Switching Freq340 kHz

Key Parameters

Start-Up Delay20ms

Step Load±6% / 500µS

Isolation2.0 kV

Target Markets

Where NH Series Works Best

The NH Series delivers reliable, cost-effective power for 24V and 48V bus systems across telecom, data center, and industrial environments.

📡

Telecom

48V bus for BTS, RRU, DRAN. Up to 336W in standard half brick for compact remote radio units.

🖥️

Servers

Rack-mount and edge servers. 12V/21A (252W) for high-current CPU and GPU power rails.

🌐

Networking

Switches, routers, SDN. Open frame option for cost-sensitive, high-volume network equipment.

🏭

Industrial

24V bus systems for PLC, factory automation. Wide temp range and Sink-Plate for harsh environments.

Part Number Builder

Configure Your Part Number

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

Series

Input Voltage

Output Voltage

Enable Logic

Pin Length (b)

Base Plate (d)

Generated Part Number

NH48240P0M-07XXX

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NH Series

Half Brick Power, Full Brick Reliability

Available Configurations

Complete Technical Parameters

Package & Pin Definitions

Efficiency & Thermal Performance

Where NH Series Works Best

Need a Custom NH Configuration?