Overview

Quarter Brick, Maximum Density

The UQ series provides up to 300W/60A output in the industry-standard quarter brick package. The efficient SR stage combined with patented Buck Reset topology reduces power loss for 235 W/in³ power density. Multi-layer single-side PCB plus Sink-Plate technology deliver superior thermal performance. Also available in full metal enclosed package for extreme environmental conditions.

300W

Max Output Power

60A

Max Output Current

235

W/in³ Power Density

Highest Density

235 W/in³ — industry-leading power density in quarter brick footprint. Efficient SR + Buck Reset topology maximizes efficiency up to 92%.

Dual Package Options

Choose open frame (Sink-Plate) for standard applications or metal enclosed for extreme environments. Potting available for rugged conditions.

High Reliability

MTBF >2.96M hours (Bellcore TR-332). 2.0kV I/O isolation, OTP protection, industry-standard quarter brick 8-pin interface.

Models

Standard Models

Available in 48V (36–75V) and 24V (18–36V) input ranges. Contact factory for custom input/output configurations.

Part Number	Input Range	Max Input Power	Vout	Iout Max	Max Output	Efficiency
UQ48120abcd-25XXX	36–75V	326W	12.0V	25A	300W	92%
UQ48070abcd-40XXX	36–75V	308W	7.0V	40A	280W	91%
UQ48050abcd-60XXX	36–75V	330W	5.0V	60A	300W	90%
UQ48033abcd-60XXX	36–75V	225W	3.3V	60A	198W	89%

Part Number	Input Range	Max Input Power	Vout	Iout Max	Max Output	Efficiency
UQ24120abcd-25XXX	18–36V	330W	12.0V	25A	300W	91%
UQ24070abcd-40XXX	18–36V	308W	7.0V	40A	280W	91%
UQ24050abcd-60XXX	18–36V	330W	5.0V	60A	300W	89%
UQ24033abcd-60XXX	18–36V	225W	3.3V	60A	198W	88%

Package Options

Two Package Configurations

The UQ series is available in both open frame (Sink-Plate) and metal enclosed versions to suit different environmental requirements.

Open Frame (Sink-Plate)

Lightweight, single-side component layout with patented Sink-Plate technology for enhanced thermal dissipation. Ideal for standard telecom and server applications.

235 W/in³43g / 1mm plate56g / 3mm plate

Weight: 43g (1mm) / 56g (3mm)

Profile: Low profile

Cooling: Sink-Plate passive

Pin: 8-pin Q-brick

Metal Enclosed

High thermal conductivity silicone potted six-sides metal package designed for extreme environmental conditions. Full EMI shielding and rugged construction.

145 W/in³105g / 3mm plate119g / 5mm plate

Weight: 105g (3mm) / 119g (5mm)

Protection: Full metal enclosure

Cooling: Conduction via baseplate

Pin: 8-pin Q-brick

Specifications

Technical Specifications

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

Absolute Maximum Ratings

Operating Temperature	-40°C to +110°C
Storage Temperature	-55°C to +125°C
Input Voltage (24V Op)	-0.5V to +40Vdc
Input Voltage (48V Op)	-0.5V to +80Vdc
Input Transient (24V, 100ms)	50V Maximum
Input Transient (48V, 100ms)	100V Maximum
I/O Isolation	2.0KV Minimum
Input to Case Isolation	1.0KV Minimum
Output to Case Isolation	1.0KV Minimum
Remote Control Voltage	-0.5V to +12Vdc

General Parameters

Switching Frequency	330KHz Typical
MTBF (Bellcore TR-332)	2.96 × 10⁶ hrs @ GB/25°C
OTP (Baseplate)	110°C ±5°C
Weight (Open Frame 1mm)	43g
Weight (Open Frame 3mm)	56g
Weight (Enclosed 3mm)	105g
Weight (Enclosed 5mm)	119g

Control Functions

Remote Control (Logic High)	+3.0V to +6.5V
Remote Control (Logic Low)	0V to +1.0V
RC Pin Input Current	-0.5mA to +1.5mA

Input

Voltage Range (24V Models)	+18V to +36Vdc
Voltage Range (48V Models)	+36V to +75Vdc
Reflected Ripple Current	30mA rms / 100mAp-p
Power ON (24V / 48V)	+17.0~18.0V / +34.0~36.0V
Power OFF (24V / 48V)	+15.6~16.6V / +31.2~33.2V
Off State Input Current	6mA Max
Latch-State Input Current	8mA Max
Input Cap (24V / 48V)	33.0µF Max / 12.0µF Max

Output

Voltage Accuracy	±1.0% Typical
Line Regulation	±0.3%
Load Regulation	±0.3%
Temperature Drift	±0.03%/°C

Package

Open Frame Plate Options	1.0mm M / 3.0mm S / 5.0mm Z
Enclosed Plate Options	3.0mm U / 5.0mm V
Base Plate Material	Aluminum alloy, anode oxide
Mounting Inserts	Stainless steel, M3×0.5
Max Screw Torque	3.9 in-Ib (0.44Nm)

Pinout

Pin Configuration & Functions

Industry-standard quarter brick 8-pin interface. Remote control, sense lines, and trim for flexible system integration.

Input Side

Pin 1−INNegative input

Pin 2PCRemote control

Pin 3+INPositive input

Output Side

Pin 4+VoPositive output

Pin 5+SPositive remote sense

Pin 6TRIMOutput voltage adjust

Pin 7−SNegative remote sense

Pin 8−VoNegative output

Performance

Typical Performance

Efficiency curves, derating, transient response, and ripple characteristics for the UQ series.

Start-up · Transient response · Ripple · Efficiency · Derating — View full detail in PDF →

Mechanical

Mechanical Drawings

Industry-standard quarter brick package dimensions. Available in open frame (Sink-Plate) or metal enclosed.

Open Frame Package — Sink-Plate technology — View full detail in PDF →

Metal Enclosed Package — Full six-sides shielded

43g

Open Frame (1mm)

105g

Enclosed (3mm)

110°C

Baseplate Temperature

Ordering Info

Part Number Builder

Configure your UQ series part number using the options below. Contact factory for custom configurations.

Series

Input

Output V

Enable

Pin Length

Standoff

Base-Plate

Current

Suffix

UQ48120P000M-25XXX

Configure options above to generate your part number

Need a Custom Configuration?

Contact our engineering team for custom input/output voltages, special pin lengths, or application-specific modifications.

Contact Us →