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Mean Well

Mean Well IRM-03-12 Switching Power Supply 3W 12V 250mA - Encapsulated

miniature encapsulated typePCB mouting style
SKU IRM-03-12
$7.05 USD
Shipping calculated at checkout.

Select model — 18 in this family

IRM-03-12
In stock
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Overview

IRM-03-12 is the 12V output model of this series: rated current 250mA, rated power 3W, typical efficiency 78%. Type Blank: PCB mounting style.

IRM-03 is a 3W miniature (37*24*15mm) AC-DC module-type power supply, ready to be soldered onto the PCB boards of various kinds of electronic instruments or industrial automation equipments. This product allows a universal input voltage range of 85~305Vac. The phenolic case and potted with silicone enhance the heat dissipation and meet the anti-vibration demand up to 5G; moreover, it provides the fundamental resistance to dust and moisture. With the high efficiency up to 80% and the extremely low no-load power consumption below 0.075W, IRM-03 series fulfills the worldwide regulation for the low power consumption requirement for electronics. The entire series is a Class Ⅱ design (no FG pin), incorporating the built-in EMI filtering components, enabling the compliance with BS EN/ EN55032 Class B; the supreme EMC features keep the end electronic units from electromagnetic interference. In addition to module-type model, IRM-03 series also offers the SMD style model.

Features

  • Universal AC input / Full range
  • No load power consumption<0.075W
  • Compact size
  • Comply with BS EN/EN55032 Class B without any additional components
  • Wide operating temp. range -30~85℃
  • Protections: Short circuit / Overload / Over voltage
  • Cooling by free air convection
  • Isolation ClassⅡ
  • High reliability, low cost
  • 3 years warranty

Specifications

IRM-03-12Specifications from the official datasheet (2025-08-08 edition)

OUTPUT

DC VOLTAGE
12V
RATED CURRENT
250mA
CURRENT RANGE
0 ~ 250mA
RATED POWER
3W
RIPPLE & NOISE (max.)Note.2
150mVp-p
VOLTAGE TOLERANCENote.3
±2.5%
LINE REGULATION
±0.5%
LOAD REGULATION
±0.5%
SETUP, RISE TIME
600ms, 30ms/230Vac 600ms, 30ms/115Vac at full load
HOLD UP TIME (Typ.)
40ms/230Vac 8ms/115Vac at full load

INPUT

VOLTAGE RANGE
85 ~ 305Vac 120~430Vdc
FREQUENCY RANGE
47 ~ 63Hz
EFFICIENCY (Typ.)
78%
AC CURRENT (Typ.)
70mA/115Vac 40mA/230Vac 35mA/277Vac
INRUSH CURRENT (Typ.)
10A/115Vac 20A/230Vac
LEAKAGE CURRENT
< 0.25mA/277Vac

PROTECTION

OVERLOAD
105%~260% rated output power Protection type : Hiccup mode, recovers automatically after fault condition is removed
OVER VOLTAGE
12.6 ~ 16.2V Protection type : Shut off o/p voltage, clamping by zener diode

ENVIRONMENT

WORKING TEMP.
-30 ~ +85℃ (Refer to "Derating Curve")
WORKING HUMIDITY
20 ~ 90% RH non-condensing
STORAGE TEMP., HUMIDITY
-40 ~ +100℃, 10 ~ 95% RH
TEMP. COEFFICIENT
±0.03%/℃ (0 ~ 50℃)
VIBRATION
10 ~ 500Hz, 5G 10min./1cycle, period for 60min. each along X, Y, Z axes
SOLDERING TEMPERATURE
Wave soldering: 265℃,5s (max.); Manual soldering: 390℃,3s (max.); Reflow soldering(SMD style): 240℃,10s (max.)

SAFETY & EMC

SAFETY STANDARDS
IEC62368-1,IEC61558-1/-2-16,UL62368-1, TUV BS EN/EN62368, BS EN/EN60335-1, BS EN/EN61558-1/-2-16, EAC TP TC 004, BSMI CNS15598-1 approved, design refer to IEC60601-1 (By request)
OVER VOLTAGE CATEGORY
IEC/EN 61558-1/-2-16(OVC Ⅱ, altitude up to 2000m); IEC/EN/UL 62368-1(OVC Ⅱ, altitude up to 2000m)
WITHSTAND VOLTAGE
I/P-O/P:4.2KVac
ISOLATION RESISTANCE
I/P-O/P:100M Ohms / 500Vdc / 25℃/ 70% RH
EMC EMISSION
Compliance to BS EN/EN55032 (CISPR32) Class B, BS EN/EN61000-3-2,-3, EAC TP TC 020, CNS15936 Class B
EMC IMMUNITY
Compliance to BS EN/EN61000-4-2,3,4,5,6,8,11, BS EN/EN55035, heavy industry level (surge L-N : 1KV), EAC TP TC 020

OTHERS

MTBF
10762.8K hrs min. Telcordia SR-332 (Bellcore) ; 2137.6K hrs min. MIL-HDBK-217F (25℃)
DIMENSION
PCB mounting style : 37*24*15mm (L*W*H) SMD style : 37*24*16mm (L*W*H)
PACKING
PCB mounting style : 0.023Kg;560pcs/14.1Kg/0.77CUFT SMD style :0.023Kg;560pcs/14.1Kg/0.77CUFT

Certifications & ratings

Marked features
LPS

MODEL ENCODING

Blank (this model)
PCB mounting style
S
SMD style
Test conditions and notes4
  1. 1. All parameters NOT specially mentioned are measured at 230VAC input, rated load and 25℃ of ambient temperature.
  2. 2. Ripple & noise are measured at 20MHz of bandwidth by using a 12" twisted pair-wire terminated with a 0.1uf & 47uf parallel capacitor.
  3. 3. Tolerance : includes set up tolerance, line regulation and load regulation.
  4. 4. The ambient temperature derating of 3.5℃/1000m with fanless models and of 5℃/1000m with fan models for operating altitude higher than 2000m(6500ft).

Technical drawings

IRM-03-12 fosc : 130KHz
fosc : 130KHz
IRM-03-12 Derating Curve
Derating Curve
IRM-03-12 Mechanical Specification
Mechanical Specification
IRM-03-12 Recommended PCB layout (for SMD
Recommended PCB layout (for SMD

Typical applications

  • Industrial electrical equipment
  • Mechanical equipment
  • Factory automation equipment
  • Handheld electronic device

Downloads

FAQ

What are the main output specifications of the Mean Well IRM-03-12?

The IRM-03-12 is a 3W encapsulated switching power supply with a regulated 12V DC output. Its rated output current is 250mA, making it suitable for low-power PCB-based equipment that needs a compact internal power source.

What input voltage range does the IRM-03-12 support?

This model supports a universal input range of 85 to 305VAC and 120 to 430VDC. That wide range helps it fit products intended for different mains environments without needing region-specific input versions.

What types of applications is the IRM-03-12 best suited for?

The IRM-03-12 is designed for compact embedded applications where space, low standby power, and board-level integration matter. It is a practical choice for OEM and industrial electronics that need a small enclosed AC-DC power module rather than a larger chassis-style supply.

Can the IRM-03-12 operate in demanding temperature conditions?

Yes, the specified working temperature range is -30°C to +85°C, subject to the output derating curve. That makes it a strong candidate for equipment exposed to a broad range of indoor or controlled industrial temperature conditions.

What protection and safety features are included in the IRM-03-12?

This model includes short circuit, overload, and over voltage protection, with overload behavior specified as hiccup mode with auto-recovery. It is also listed with isolation class II and references multiple safety and EMC standards, which supports use in professionally designed equipment.

How compact is the Mean Well IRM-03-12 compared with larger internal power supplies?

The IRM-03-12 is much smaller than conventional enclosed or open-frame power supplies, with a PCB mounting size of 37 x 24 x 15mm. Its encapsulated format is intended for space-constrained designs that need a low-power internal AC-DC module.

Payment & Security

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Mean Well IRM-03-12 Switching Power Supply 3W 12V 250mA - Encapsulated
Mean Well

Mean Well IRM-03-12 Switching Power Supply 3W 12V 250mA - Encapsulated

$7.05 USD

IRM-03-12 is the 12V output model of this series: rated current 250mA, rated power 3W, typical efficiency 78%. Type Blank: PCB mounting style.

IRM-03 is a 3W miniature (37*24*15mm) AC-DC module-type power supply, ready to be soldered onto the PCB boards of various kinds of electronic instruments or industrial automation equipments. This product allows a universal input voltage range of 85~305Vac. The phenolic case and potted with silicone enhance the heat dissipation and meet the anti-vibration demand up to 5G; moreover, it provides the fundamental resistance to dust and moisture. With the high efficiency up to 80% and the extremely low no-load power consumption below 0.075W, IRM-03 series fulfills the worldwide regulation for the low power consumption requirement for electronics. The entire series is a Class Ⅱ design (no FG pin), incorporating the built-in EMI filtering components, enabling the compliance with BS EN/ EN55032 Class B; the supreme EMC features keep the end electronic units from electromagnetic interference. In addition to module-type model, IRM-03 series also offers the SMD style model.

Features

  • Universal AC input / Full range
  • No load power consumption<0.075W
  • Compact size
  • Comply with BS EN/EN55032 Class B without any additional components
  • Wide operating temp. range -30~85℃
  • Protections: Short circuit / Overload / Over voltage
  • Cooling by free air convection
  • Isolation ClassⅡ
  • High reliability, low cost
  • 3 years warranty

Typical applications

  • Industrial electrical equipment
  • Mechanical equipment
  • Factory automation equipment
  • Handheld electronic device

Model

  • 1W 12V
  • 1W +S 12V
  • 2W 12V
  • 2W +S 12V
  • 3W 12V
  • 3W +S 12V
  • 5W 12V
  • 10.5W 12V
  • 15W 12V
  • 20W 12V
  • 30W 12V
  • 30W +ST 12V
  • 45W 12V
  • 45W +ST 12V
  • 60W 12V
  • 60W +ST 12V
  • 90W 12V
  • 90W +ST 12V
View product

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