Mean Well IRM-03-3.3S Switching Power Supply 3W 3.3V 900mA

Name: Mean Well IRM-03-3.3S Switching Power Supply 3W 3.3V 900mA - Encapsulated
Brand: Mean Well
SKU: IRM-03-3.3S
Price: 7.16 USD
Availability: InStock

Overview

IRM-03-3.3S is the 3.3V output model of this series: rated current 900mA, rated power 3W, typical efficiency 68%. Type S: SMD 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-03-3.3SSpecifications from the official datasheet (2025-08-08 edition)

OUTPUT

DC VOLTAGE: 3.3V
RATED CURRENT: 900mA
CURRENT RANGE: 0 ~ 900mA
RATED POWER: 3W
RIPPLE & NOISE (max.)^Note.2: 100mVp-p
VOLTAGE TOLERANCE^Note.3: ±2.5%
LINE REGULATION: ±0.5%
LOAD REGULATION: ±1.0%
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.): 68%
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: 3.8 ~ 4.9V 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: PCB mounting style
S (this model): SMD style

Test conditions and notes4

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 0.1uf & 47uf 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).

Technical drawings

IRM-03-3.3S fosc : 130KHz — fosc : 130KHz

IRM-03-3.3S Derating Curve — Derating Curve

IRM-03-3.3S Mechanical Specification — Mechanical Specification

IRM-03-3.3S Recommended PCB layout (for SMD — Recommended PCB layout (for SMD

Typical applications

Industrial electrical equipment
Mechanical equipment
Factory automation equipment
Handheld electronic device

Downloads

Datasheet1

IRM-03-3.3S datasheetIRM-03-SPEC.PDF · 2025-08-08 edition PDF Download

Certificates4

EMC Certificate (IRM-03)(EN) PDF Download

UL Certificate (IRM-03)(EN) PDF Download

CB Certificate (IRM-03)(EN) PDF Download

TUV Certificate (IRM-03)(EN) PDF Download

Test reports1

Test Report (IRM-03-3.3)(EN) PDF Download

Catalogues1

Mean Well Catalog (Industrial) PDF Download

FAQ

Can I use the IRM-03-3.3S for a 3.3V embedded controller or processor board?

Yes, it provides a constant 3.3V output rated at 3W with 900mA available. That makes it suitable for embedded controller, processor, and logic boards that need an AC-input 3.3V rail within that current range.

Is the IRM-03-3.3S a fit for low-power industrial communication electronics?

It can be used for low-power communications electronics that run from 3.3V and stay within a 900mA load. The wide 85-305VAC input range is useful when the finished equipment may be used in more than one mains environment.

Can this model power 3.3V sensing or monitoring circuitry in automation equipment?

Yes, for sensing or monitoring sections that need a regulated 3.3V source and do not exceed 3W total demand. Its miniature encapsulated SMD style also helps where board area matters.

Would the IRM-03-3.3S work in a compact smart device or control node?

Yes, it is well suited to compact smart devices or control nodes that need a modest 3.3V rail from AC input. The module measures 37.0 x 24.0 x 16.0 mm and weighs 0.023 kg, so it is aimed at compact internal integration rather than larger power stages.

Can the IRM-03-3.3S be used in outdoor equipment cabinets?

The operating temperature range of -30°C to +85°C supports a broad thermal envelope inside protected equipment. No IP rating is provided, so it is better used inside sealed or sheltered enclosures than in exposed outdoor locations.

How does the IRM-03-3.3S differ from other 3.3V IRM models?

Within the IRM-03 series, the 3.3V output comes in two versions: IRM-03-3.3 (PCB mounting style, 37 x 24 x 15 mm) and IRM-03-3.3S (SMD style, 37 x 24 x 16 mm), both rated 3W and 900mA. The series also covers 5V, 9V, 12V, 15V and 24V outputs, all at 3W. The IRM-03-3.3S is the SMD-style 3W, 3.3V version in that family.

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Mean Well IRM-03-3.3S Switching Power Supply 3W 3.3V 900mA - Encapsulated

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