Mean Well IRM-20-3.3 Power Supply 3.3V 4.5A - Encapsulated | US Stock Availability

Name: Mean Well IRM-20-3.3 Switching Power Supply 3W 3.3V 4.5A - Encapsulated
Brand: Mean Well
SKU: IRM-20-3.3
Price: 12.05 USD
Availability: InStock

Overview

IRM-20-3.3 is the 3.3V output model of this series: rated current 4.5A, rated power 14.85W, typical efficiency 76%.

IRM-20 is a 20W miniature (52.4*27.2*24mm) 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 2G; moreover, it provides the fundamental resistance to dust and moisture. With the high efficiency up to 85% and the extremely low no-load power consumption below 0.1W, IRM-20 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

2.06''x1.07''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-20-3.3Specifications from the official datasheet (2025-11-21 edition)

OUTPUT

DC VOLTAGE: 3.3V
RATED CURRENT: 4.5A
CURRENT RANGE: 0 ~ 4.5A
RATED POWER: 14.85W
RIPPLE & NOISE (max.)^Note.2: 200mVp-p
VOLTAGE TOLERANCE^Note.3: ±2.5%
LINE REGULATION: ±0.5%
LOAD REGULATION: ±1%
SETUP, RISE TIME: 1000ms, 20ms/230Vac 1000ms, 20ms/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 ~ 440Hz
EFFICIENCY (Typ.): 76%
AC CURRENT (Typ.): 0.6A/115Vac 0.4A/230Vac 0.3A/277Vac
INRUSH CURRENT (Typ.): COLD START 20A/115Vac 40A/230Vac
LEAKAGE CURRENT: < 0.25mA/277Vac

PROTECTION

OVERLOAD: 115%~160% rated output power Protection type : Hiccup mode, recovers automatically after fault condition is removed
OVER VOLTAGE: 3.8 ~ 4.46V 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, 2G 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.4: 2000 meters

SAFETY & EMC

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 2000m)
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 4,2KV/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 4,2KV/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: 10656.2K hrs min. Telcordia SR-332 (Bellcore) ; 970.3K hrs min. MIL-HDBK-217F (25℃)
DIMENSION: 52.4*27.2*24mm (L*W*H)
PACKING: 0.05Kg/240pcs/13Kg/0.94CUFT

Test conditions and notes5

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. 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).
5. 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-20-3.3 Block Diagram — Block Diagram

IRM-20-3.3 Derating Curve — Derating Curve

Typical applications

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

Downloads

Datasheet1

IRM-20-3.3 datasheetIRM-20-SPEC.PDF · 2025-11-21 edition PDF Download

Certificates4

EMC Certificate (IRM-20)(EN) PDF Download

UL Certificate (IRM-20)(EN) PDF Download

CB Certificate (IRM-20)(EN) PDF Download

TUV Certificate (IRM-20)(EN) PDF Download

Test reports1

Test Report(IRM-20-3.3)(EN) PDF Download

Catalogues1

Mean Well Catalog (Industrial) PDF Download

FAQ

Can I use the IRM-20-3.3 to power a 3.3V embedded controller board from AC mains?

Yes, this model is designed for constant-voltage 3.3V output up to 4.5A, with 14.85W total power. That makes it suitable for embedded controller boards, logic backplanes, or communication modules that run on 3.3V DC. The 85-305VAC input supports direct AC-powered equipment designs.

Is the IRM-20-3.3 a good fit for industrial communication or gateway hardware that runs on 3.3V?

It can be a good fit when the 3.3V electronics require no more than 4.5A. The output rating suits low-voltage digital hardware such as gateways, protocol modules, or board-level communications assemblies powered from AC mains. Its encapsulated PCB-mount format is intended for integration inside equipment.

Can this power supply support a 3.3V SBC or processor module in an automation system?

Yes, if the processor module and attached 3.3V loads stay within 14.85W and 4.5A. The supply delivers a fixed 3.3V output, which is appropriate for logic-level computing and embedded processing hardware. The compact 52.4 x 27.2 x 24.0 mm footprint also helps in dense controller layouts.

Would the IRM-20-3.3 work for low-voltage digital I/O and logic circuits?

It is intended for 3.3V constant-voltage loads, so it can serve digital I/O, logic, and control circuits that remain within 4.5A. Compared with higher-voltage models in the same family, this version is specifically aimed at low-voltage electronics rather than 12V, 15V, or 24V control rails. Buyers should match both the required voltage and total current draw to the 3.3V, 4.5A rating.

Is the IRM-20-3.3 suitable for outdoor electronic assemblies?

The specified operating temperature range is -30C to +85C, with output derating at higher temperatures per the derating curve, which supports a broad range of internal operating conditions. However, no IP rating is listed in the provided specs, so it should not be assumed to be suitable for direct outdoor exposure. It is better used inside a protected enclosure or equipment housing.

Payment & Security

Payment methods

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.

Please log in to write a review.

{ "id":8656088727872, "variants" :[{ "context":"default", "variant_id": 46625330856256, "sku":"IRM-20-3.3", "inventory_qty" : 46, "customer" :true, "custom_html" :"\u003cdiv class=\"price\"\u003e\n \u003cdiv class=\"price__default\"\u003e\n \u003cstrong class=\"price__current\"\u003e$12.05\u003c\/strong\u003e\n \u003cs class=\"price__was\"\u003e\u003c\/s\u003e\n \u003c\/div\u003e\n\n \u003cdiv class=\"unit-price relative\" hidden\u003e\u003cspan class=\"visually-hidden\"\u003eUnit price\u003c\/span\u003e\u003cspan class=\"unit-price__price\"\u003e\u003c\/span\u003e\u003cspan class=\"unit-price__separator\"\u003e \/ \u003c\/span\u003e\u003cspan class=\"unit-price__unit\"\u003e\u003c\/span\u003e\u003c\/div\u003e\n\n \u003cdiv class=\"price__no-variant\" hidden\u003e\n \u003cstrong class=\"price__current\"\u003eUnavailable\u003c\/strong\u003e\n \u003c\/div\u003e\n\n \u003c\/div\u003e", "volume_html" :"\u003cvolume-pricing class=\"parent-display inside_product_form\" id=\"volume-pricing-main\" \u003e\u003c\/volume-pricing\u003e" } ] }

Mean Well IRM-20-3.3 Switching Power Supply 3W 3.3V 4.5A - Encapsulated

Select model — 10 in this family

Overview

Features

Specifications

OUTPUT

INPUT

PROTECTION

ENVIRONMENT

SAFETY & EMC

OTHERS

Technical drawings

Typical applications

Downloads

Datasheet1

Certificates4

Test reports1

Catalogues1

FAQ

Payment & Security

Write a review

Your cart

Mean Well IRM-20-3.3 Switching Power Supply 3W 3.3V 4.5A - Encapsulated

Features

Typical applications

Company Information

Services and Support

Choose options