Mean Well IRM-05-3.3 3.3V 1.25A Power Supply - Encapsulated | Stock Availability in the US

Name: Mean Well IRM-05-3.3 Switching Power Supply 4.125W 3.3V 1.25A - Encapsulated
Brand: Mean Well
SKU: IRM-05-3.3
Price: 9.16 USD
Availability: InStock

Overview

IRM-05-3.3 is the 3.3V output model of this series: rated current 1.25A, rated power 4.125W, typical efficiency 68%.

IRM-05 is a 5W miniature (45.7*25.4*21.5mm) 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 the universal input voltage range of 85~ 305 Vac. The 94V-0 flame retardant plastic 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 77% and the extremely low no-load power consumption below 0.1W, IRM-05 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.

Features

1.8''x1''compact size
Universal input 85~305Vac
No load power consumption<0.1W
EMI Class B without additional components
Wide operating temp. range -30~85℃
Protections: Short circuit / Overload / Over voltage
Cooling by free air convection
Isolation Class Ⅱ
Over voltage category Ⅲ (OVC Ⅲ)
Pass LPS
3 years warranty

Specifications

IRM-05-3.3Specifications from the official datasheet (2025-08-08 edition)

OUTPUT

DC VOLTAGE: 3.3V
RATED CURRENT: 1.25A
CURRENT RANGE: 0 ~ 1.25A
RATED POWER: 4.125W
RIPPLE & NOISE (max.)^Note.2: 200mVp-p
VOLTAGE TOLERANCE^Note.3: ±2.5%
LINE REGULATION: ±0.3%
LOAD REGULATION: ±0.5%
SETUP, RISE TIME^Note.4: 600ms, 30ms at full load
HOLD UP TIME (Typ.): 80ms/230Vac 15ms/115Vac at full load

INPUT

VOLTAGE RANGE: 85 ~ 305Vac 120 ~ 430Vdc
FREQUENCY RANGE: 47 ~ 440Hz
EFFICIENCY (Typ.): 68%
AC CURRENT (Typ.): 0.12A/115Vac 0.08A/230Vac 0.06A/277Vac
INRUSH CURRENT (Typ.): COLD START 20A/115Vac 40A/230Vac
LEAKAGE CURRENT: < 0.25mA/277Vac

PROTECTION

OVERLOAD: 115% ~ 260% rated output power Protection type : Hiccup mode, recovers automatically after fault condition is removed
OVER VOLTAGE: 3.8 ~ 4.95V 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 ~ +85℃, 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.)
OPERATING ALTITUDE^Note.5: 2000 meters

SAFETY & EMC (Note.6)

SAFETY STANDARDS: IEC62368-1,IEC61558-1/-2-16,UL62368-1,TUV BS EN/EN62368-1,BS EN/EN61558-1/-2-16,EAC TP TC 004, BSMI CNS15598-1 approved
OVER VOLTAGE CATEGORY: IEC/EN 61558-1/-2-16(OVC Ⅲ, altitude up to 2000m); IEC/EN/UL 62368-1(OVC Ⅱ, altitude up to 5000m)
WITHSTAND VOLTAGE: I/P-O/P:4.2KVac
ISOLATION RESISTANCE: I/P-O/P:100M Ohms / 500Vdc / 25℃/ 70% RH
EMC EMISSION: Parameter Standard Test Level

Conducted BS EN/EN55032(CISPR32), CNS15936 Class B
Radiated BS EN/EN55032(CISPR32), CNS15936 Class B
Harmonic Current (Note 5) BS EN/EN61000-3-2 Class A
Voltage Flicker BS EN/EN61000-3-3
EMC IMMUNITY: BS EN/EN55035, BS EN/EN61000-6-2

Parameter Standard Test Level

ESD BS EN/EN61000-4-2 Level 3, 8KV air; Level 2, 4KV contact, criteria A
Radiated Susceptibility BS EN/EN61000-4-3 Level 3, criteria A
EFT/Burest BS EN/EN61000-4-4 Level 3, criteria A
Surge BS EN/EN61000-4-5 Level 3,1KV/L-N, criteria A
Conducted BS EN/EN61000-4-6 Level 3, criteria A
Magnetic Field BS EN/EN61000-4-8 Level 4, criteria A
Voltage Dips and interruptions BS EN/EN61000-4-11 ＞95% dip 0. 5 periods, 30% dip 25 periods, ＞95% interruptions 250 periods

Parameter	Standard	Test Level
Conducted	BS EN/EN55032(CISPR32), CNS15936	Class B
Radiated	BS EN/EN55032(CISPR32), CNS15936	Class B
Harmonic Current (Note 5)	BS EN/EN61000-3-2	Class A
Voltage Flicker	BS EN/EN61000-3-3

Parameter	Standard	Test Level
ESD	BS EN/EN61000-4-2	Level 3, 8KV air; Level 2, 4KV contact, criteria A
Radiated Susceptibility	BS EN/EN61000-4-3	Level 3, criteria A
EFT/Burest	BS EN/EN61000-4-4	Level 3, criteria A
Surge	BS EN/EN61000-4-5	Level 3,1KV/L-N, criteria A
Conducted	BS EN/EN61000-4-6	Level 3, criteria A
Magnetic Field	BS EN/EN61000-4-8	Level 4, criteria A
Voltage Dips and interruptions	BS EN/EN61000-4-11	＞95% dip 0. 5 periods, 30% dip 25 periods, ＞95% interruptions 250 periods

OTHERS

MTBF: 9083.9K hrs min. Telcordia SR-332 (Bellcore) ; 1495.8K hrs min. MIL-HDBK-217F (25℃)
DIMENSION: 45.7*25.4*21.5 mm (L*W*H)
PACKING: 0.033Kg;270pcs/ 9.8Kg/0.94CUFT

Test conditions and notes6

1. All parameters NOT specially mentioned are measured at 230VAC input, rated load and 25℃ of ambient temperature.
2. Ripple & noise are measured at 20MHz of bandwidth by using a 12" twisted pair-wire terminated with a 0.1μF & 47μF parallel capacitor.
3. Tolerance : includes set up tolerance, line regulation and load regulation.
4. Length of set up time is measured at first cold start. Turning ON/OFF the power supply may lead to increase of the set up time.
5. 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).
6. The power supply is considered as an independent unit ,but the final equipment still need to re-confirm that the whole system complies with the EMC directives. For guidance on how to perform these EMC tests, please refer to “EMI testing of component power supplies.” (as available on https://www.meanwell.com//Upload/PDF/EMI_statement_en.pdf )

Technical drawings

IRM-05-3.3 Block Diagram — Block Diagram

IRM-05-3.3 Derating Curve — Derating Curve

Typical applications

Industrial electrical equipment
Mechanical equipment
Factory automation equipment
Hand-held electronic device

Downloads

Datasheet1

IRM-05-3.3 datasheetIRM-05-SPEC.PDF · 2025-08-08 edition PDF Download

Certificates4

EMC Certificate (IRM-05)(EN) PDF Download

UL Certificate (IRM-05)(EN) PDF Download

CB Certificate (IRM-05)(EN) PDF Download

TUV Certificate (IRM-05)(EN) PDF Download

Test reports1

Test Report (IRM-05-3.3)(EN) PDF Download

Catalogues1

Mean Well Catalog (Industrial) PDF Download

FAQ

Can I use the IRM-05-3.3 to power a 3.3V microcontroller or embedded logic board?

Yes, it is a constant-voltage 3.3V supply rated for 4.125W and 1.25A. That makes it suitable for embedded controllers, logic boards, and low-power digital electronics that need a 3.3V rail within that output limit.

Is the IRM-05-3.3 appropriate for industrial IoT or communication electronics that run on 3.3V?

It can be a fit for 3.3V industrial IoT and communication circuits when total demand stays within 1.25A and 4.125W. The 85-305VAC input range is also useful when the finished equipment may be deployed on different AC mains systems.

Can this model be used in a compact automation board with 3.3V digital electronics?

Yes, especially where board space matters, because the encapsulated PCB-mount package is 45.7 × 25.4 × 21.5 mm. Its output is intended for low-power 3.3V electronics rather than mixed-voltage systems that need higher-power rails.

How does the IRM-05-3.3 compare with the other IRM-05 power supplies?

The IRM-05 family includes IRM-05-3.3 at 4.125W, 3.3V, 1.25A; IRM-05-5 at 5W, 5V, 1A; IRM-05-12 at 5.04W, 12V, 0.42A; IRM-05-15 at 4.95W, 15V, 0.33A; and IRM-05-24 at 5.52W, 24V, 0.23A. The 3.3V model provides the highest current in this group because it is the lowest-voltage version.

Can the IRM-05-3.3 be used in outdoor equipment or wide-temperature environments?

Its operating temperature range is -30°C to +85°C, with output derating per the derating curve, which supports use in equipment designed for a broad temperature window. No IP rating is listed, so it should be used inside a suitable enclosure if the application involves dust, water, or outdoor exposure.

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Mean Well IRM-05-3.3 Switching Power Supply 4.125W 3.3V 1.25A - Encapsulated

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Overview

Features

Specifications

OUTPUT

INPUT

PROTECTION

ENVIRONMENT

SAFETY & EMC (Note.6)

OTHERS

Technical drawings

Typical applications

Downloads

Datasheet1

Certificates4

Test reports1

Catalogues1

FAQ

Payment & Security

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Mean Well IRM-05-3.3 Switching Power Supply 4.125W 3.3V 1.25A - Encapsulated

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