Name: CBQ Series Quarter Brick DC/DC Converter
Brand: OneTech Integration
Availability: InStock

Why CBQ Series

Engineering That Eliminates Compromise

The CBQ Series was built for power architects who need maximum output in minimum space — without sacrificing reliability. Six-sided metal enclosure, patented topology, and a multi-layer single-sided PCB combine to deliver telecom-grade performance in a standard quarter brick footprint.

Patented Buck Reset Topology

Proprietary switching architecture reduces losses at every load point — not just peak. The result is consistently high efficiency from 10% to 100% load, which directly reduces thermal stress and extends component life.

Six-Sided Metal Enclosure

Full 1.0 mm aluminum alloy (anodized) shroud provides EMI shielding, mechanical protection, and a low-impedance thermal path. No chassis cut-out or external heatsink required for most operating conditions.

Synchronous Rectification

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

Triple Protection (OCP/OVP/OTP)

Over-current (108–125%), over-voltage (115–130%), and over-temperature (110°C Tc) protection operate simultaneously. No trade-off between responsiveness and false triggering.

Remote On/Off Control

PC pin supports both positive and negative logic. Logic High (3.0–6.5V) enables; Logic Low (0–1.0V) shuts down. Enables clean power sequencing in multi-rail designs without external sequencer ICs.

4.57M Hours MTBF

Bellcore TR-332 Issue 6 verified at GB/25°C. 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 quarter brick footprint and pin-out. Select input bus (48V or 24V) and required output voltage. Contact OneTech Integration for custom voltages beyond the listed range.

Part Number	Input Range	Max Input Power	Output Voltage	Output Current	Max Output	Efficiency
CBQ10048S5V0-LabcXXX	36V – 75V	139W	5.0V	25A	125W	90%
CBQ10048S3V3-LabcXXX	36V – 75V	94W	3.3V	25A	83W	89%
CBQ10048S2V5-LabcXXX	36V – 75V	73W	2.5V	25A	63W	87%
CBQ10048S2V0-LabcXXX	36V – 75V	59W	2.0V	25A	50W	85%
CBQ10048S1V8-LabcXXX	36V – 75V	53W	1.8V	25A	45W	85%
CBQ10048S1V5-LabcXXX	36V – 75V	46W	1.5V	25A	38W	83%

Part Number	Input Range	Max Input Power	Output Voltage	Output Current	Max Output	Efficiency
CBQ10024S5V0-LabcXXX	18V – 36V	141W	5.0V	25A	125W	89%
CBQ10024S3V3-LabcXXX	18V – 36V	94W	3.3V	25A	83W	88%
CBQ10024S2V5-LabcXXX	18V – 36V	74W	2.5V	25A	63W	86%
CBQ10024S2V0-LabcXXX	18V – 36V	59W	2.0V	25A	50W	85%
CBQ10024S1V8-LabcXXX	18V – 36V	54W	1.8V	25A	45W	84%
CBQ10024S1V5-LabcXXX	18V – 36V	46W	1.5V	25A	38W	83%

* Contact OneTech Integration for special input/output configurations or custom output voltages.

Electrical Specifications

Complete Technical Parameters

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

Input

48V Operating Range	+36V to +75V DC
24V Operating Range	+18V to +36V DC
48V Transient (100 ms)	100V Maximum
24V Transient (100 ms)	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 (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)	10.0 µF Max
Input Capacitance (24V)	22.0 µF Max
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	±0.3% (full input range)
Load Regulation	±0.3% (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	330 kHz typical
MTBF	4.57 × 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	55 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: −0.5V to +12V DC. Exceeding absolute maximum ratings may permanently damage the device and void warranty.

Physical & Mechanical

Package & Pin Definitions

Standard quarter brick footprint. Golden over Nickel plated pins on copper alloy or brass base. Aluminum alloy base plate with anodized surface and M3×0.5 stainless steel threaded inserts.

Input Side

1

−IN

Negative Input

2

PC

Remote On/Off Control

3

+IN

Positive Input

CBQ Series

Quarter Brick · Enclosed Metal

2.3" × 1.45" (58.42 × 36.83 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 in Part Number)

0

0.12" / 3.05 mm

1

0.16" / 4.06 mm

2

0.20" / 5.08 mm

3

0.24" / 6.10 mm

Base-Plate code "E" = 1.0mm metallic enclosure (standard for CBQ). Max torque on M3 inserts: 3.9 in-lb (0.44 Nm). 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	Aluminum alloy with anode oxide
Mounting inserts	M3 × 0.5 stainless steel (4 plcs)
Max torque	3.9 in‑lb (0.44 Nm)
Pin material	Copper alloy or Brass
Pin plating	Golden over Nickel

Weight

55g

Metallic Enclosed Package

Footprint

2.300" × 1.450"

(58.42 × 36.83 mm)

Metal Enclosed Package — Mechanical Drawing

CBQ Series Mechanical Drawing — Package Dimensions and Pin Connections

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

Performance Data

Efficiency & Thermal Derating

Measured at nominal input, full output, 25°C. The CBQ10048S5V0 achieves 92.58% peak at 48V/15A — remarkably flat from 10A through 25A, which simplifies thermal budgeting across the load profile.

CBQ10048S5V0 — Efficiency vs. Load Current (A)

36V input

48V input (nominal)

75V input

Typical Waveforms — CBQ10048S5V0 (V_IN: 48V, Full Load)

Start-Up Waveform

V_IN: 48V · Load: 25A

Ch1: Output Voltage 4.96V peak

Transient Response

Load: 20.5A → 13.0A @ 2.5A/μS

Recovery within 500 μS ±6% Vo

Input / Output Ripple

V_IN: 48V · Load: 25A · L_IN=10μH

Output p-p: 77mV RMS: 9.75mV

Derating Curves — CBQ10048S5V0 (Tc = 110°C)

CBQ10048S5V0 Thermal Derating Curves — Load (A) vs Ambient Temperature

■ 200 LFM ■ 100 LFM ■ 50 LFM ■ Free Air

Derating Curves — CBQ10024S3V3 (Tc = 110°C)

CBQ10024S3V3 Thermal Derating Curves — Iout (A) vs Ta (°C)

■ Free Air ■ 0.5M/S ■ 1.0M/S ■ 1.5M/S ■ 2.0M/S ■ 2.5M/S

Thermal Summary — CBQ10048S5V0

Free AirFull 25A to ~60°C ambient

50 LFMFull 25A to ~75°C ambient

100 LFMFull 25A to ~90°C ambient

200 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 (77 mV @ 5V)

Output Ripple RMS1% Vo max (50 mV @ 5V)

Switching Frequency330 kHz typical

Target Markets

Where CBQ Series Works Best

The CBQ's 48V bus compatibility, 2:1 input range, full metal enclosure, and safety agency approvals make it the go-to isolated quarter brick for mission-critical infrastructure.

📡

Telecom Base Stations

48V bus rails in BTS and RRU. OCP/OVP prevents cascade failure when antennas experience lightning coupling or bus faults.

🖥️

Servers & Edge Computing

Point-of-load from 48V distribution to 5V/3.3V logic. High MTBF and flat efficiency reduce TCO in rack deployments.

🔌

Networking Equipment

Switches, routers, and SDN appliances. The 2:1 input range accommodates both 24V and 48V bus without board redesign.

🏭

Industrial Control

DIN-rail and panel-mount with isolated DC/DC and safety approvals. −40°C cold-start for outdoor enclosures.

Part Number Builder

Configure Your Part Number

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

Series

Input Voltage Bus

Output Voltage

Enable Logic

Pin Length (b code)

Base Plate

Generated Part Number

CBQ10048S5V0-LP0EXXXX

Request Quote → Email Sales