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Mean Well

Mean Well DCW03B-12 DC-DC Converter - 3W - 18~36V in ±12V out 125mA

SKU DCW03B-12
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Overview

DCW03B-12 is the ±12V output model of this series: rated power 3W, typical efficiency 80%.

Features

  • 2:1 wide input range
  • 4:1 wide input range(option)
  • 1000VDC I/O isolation
  • 3000VDC I/O isolation(option)
  • Built-in EMI filter
  • Protections: Short circuit / Overload
  • Cooling by free air convection
  • Five-sided shield metal case
  • 100% burn-in test
  • Low cost / High reliability
  • Approvals: FCC / CE
  • 2 years warranty

Specifications

DCW03B-12Specifications from the official datasheet (2018-03-23 edition)Download datasheet PDF

OUTPUT

DC VOLTAGE
±12V
CURRENT RANGE
±12.5 ~ ±125mA
RATED POWER
3W
RIPPLE & NOISE (max.)Note.2
60mVp-p
LINE REGULATIONNote.3
±0.5%
LOAD REGULATIONNote.4
±0.5%
VOLTAGE ACCURACY
±2.0%
SWITCHING FREQUENCY
50KHz min.

INPUT

VOLTAGE RANGE
18 ~ 36VDC
EFFICIENCY (Typ.)
80%
DC CURRENT Full load
167mA
DC CURRENT No load
10mA
FILTER
Pi network
PROTECTION
Fuse recommended

PROTECTION (Note. 5)

OVERLOAD
160 ~ 250% rated output power Protection type : Hiccup mode, recovers automatically after fault condition is removed
SHORT CIRCUIT
All output equipped with short circuit Protection type : Hiccup mode, recovers automatically after fault condition is removed

ENVIRONMENT

WORKING TEMP.
-40 ~ + 71℃ (Refer to "Derating Curve")
WORKING HUMIDITY
20% ~ 90% RH non-condensing
STORAGE TEMP., HUMIDITY
-40 ~ +105℃, 10 ~ 95% RH
TEMP. COEFFICIENT
±0.03% / ℃ (0 ~ 50℃)
VIBRATION
10 ~ 500Hz, 2G 10min./1 cycle, period for 60min. each along X, Y, Z axes

SAFETY & EMC

SAFETY STANDARDS
EAC TP TC 004 approved
WITHSTAND VOLTAGE
I/P-O/P:1KVDC
ISOLATION RESISTANCE
I/P-O/P: 100M Ohms / 500VDC / 25℃/ 70% RH
ISOLATION CAPACITANCE
80pF max.
EMC EMISSION
Compliance to EN55032 Class B, FCC part 15 Class B , EAC TP TC 020
EMC IMMUNITY
Compliance to EN61000-4-2,3,4,5,6,8, light industry level, criteria A , EAC TP TC 020

OTHERS

MTBF
900khrs min. MIL-HDBK-217F (25℃)
DIMENSION
31.8*20.3*12.2mm or 1.25"*0.80"*0.48" inch (L*W*H)
WEIGHT
15g
Test conditions and notes5
  1. 1.All parameters are specified at normal input, rated load, 25℃ 70% RH ambient.
  2. 2.Ripple & noise are measured at 20MHz by using a 12" twisted pair terminated with a 0.1uf & 47uf capacitor.
  3. 3.Line regulation is measured from low line to high line at rated load.
  4. 4.Load regulation is measured from 10% to 100% rated load.
  5. 5.Please prevent the converter from operating in overload or short circuit condition for more than 30 seconds.

Technical drawings

DCW03B-12 Mechanical Specification
Mechanical Specification

Downloads

FAQ

What are the key electrical specifications of the Mean Well DCW03B-12?

The DCW03B-12 is a 3W DC-DC converter with an 18 to 36V DC input range and a ±12V DC output. Its output current range is ±12.5 to ±125 mA and it has a typical efficiency of 80%. This model is designed for compact low-power conversion where regulated dual output is needed.

What types of applications is the DCW03B-12 suited for?

This model is suited to low-power industrial and embedded applications that need isolated DC-DC conversion from an 18 to 36V DC input. Its compact size, built-in EMI filter, and shielded metal case make it a fit for control electronics, instrumentation, and other space-constrained equipment. It is generally chosen where stable ±12V output and 1000VDC input-to-output isolation are important.

Does the DCW03B-12 provide isolation between input and output?

Yes, the DCW03B-12 provides 1000VDC input-to-output isolation (withstand voltage). It also specifies 100 MΩ isolation resistance at 500VDC and 80 pF maximum isolation capacitance. These characteristics help support use in systems that need separated input and output power domains.

How does the DCW03B-12 handle overload and short-circuit conditions?

This converter includes overload protection and short-circuit protection on all outputs, both in hiccup mode with automatic recovery once the fault is removed. Overload protection triggers at 160% to 250% of rated output power. Operation in overload or short circuit should not exceed 30 seconds, so automatic recovery is meant for clearing transient faults.

What operating environment is the DCW03B-12 designed for?

The DCW03B-12 has a working temperature range of -40°C to +71°C, subject to the output derating curve. Storage temperature is specified from -40°C to +105°C. It is cooled by free air convection and uses a five-sided shield metal case for durability and EMI performance.

What makes the DCW03B-12 different from non-isolated or basic low-cost converters?

Compared with basic non-isolated converters, the DCW03B-12 adds 1000VDC input-to-output isolation, built-in EMI filtering, and a shielded metal case. It is also 100% burn-in tested and backed by a 2-year warranty. Those features make it a stronger fit for industrial and OEM use where reliability matters more than lowest upfront cost.

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Mean Well DCW03B-12 DC-DC Converter - 3W - 18~36V in ±12V out 125mA
Mean Well

Mean Well DCW03B-12 DC-DC Converter - 3W - 18~36V in ±12V out 125mA

Log in to see price

DCW03B-12 is the ±12V output model of this series: rated power 3W, typical efficiency 80%.

Features

  • 2:1 wide input range
  • 4:1 wide input range(option)
  • 1000VDC I/O isolation
  • 3000VDC I/O isolation(option)
  • Built-in EMI filter
  • Protections: Short circuit / Overload
  • Cooling by free air convection
  • Five-sided shield metal case
  • 100% burn-in test
  • Low cost / High reliability
  • Approvals: FCC / CE
  • 2 years warranty
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