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Mean Well IRM-03-9S Switching Power Supply 3W 9V 333mA - Encapsulated

Name: Mean Well IRM-03-9S Switching Power Supply 3W 9V 333mA - Encapsulated
Brand: Mean Well
SKU: IRM-03-9S
Price: 8.02 USD
Availability: InStock

miniature encapsulated typeSMD style

SKU IRM-03-9S

$8.02 USD

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In stock

Overview

IRM-03-9S is the 9V output model of this series: rated current 333mA, rated power 3W, typical efficiency 77%. 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-03-9SSpecifications from the official datasheet (2025-08-08 edition)

OUTPUT

DC VOLTAGE: 9V
RATED CURRENT: 333mA
CURRENT RANGE: 0 ~ 333mA
RATED POWER: 3W
RIPPLE & NOISE (max.)^Note.2: 100mVp-p
VOLTAGE TOLERANCE^Note.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.): 77%
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: 10.3 ~ 12.2V 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: 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-03-9S Derating Curve — Derating Curve

IRM-03-9S Mechanical Specification — Mechanical Specification

IRM-03-9S 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-03-9S 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-03-9)(EN) PDF Download

Catalogues1

Mean Well Catalog (Industrial) PDF Download

FAQ

Can I use the IRM-03-9S to power a small 9V industrial sensor or control circuit?

Yes, it is a constant-voltage 9V supply rated for 3W and 333mA. That makes it a fit for low-power 9V industrial, embedded, or automation circuits that stay within 3W.

Is the IRM-03-9S suitable for embedded 9V electronics inside compact equipment?

It is designed for compact builds, with a 37.0 × 24.0 × 16.0 mm body and miniature encapsulated SMD style construction. Electrically, it provides 9V at up to 333mA, so it fits small embedded loads rather than higher-draw 9V devices.

Can this power supply be used in a low-power automation interface board that needs 9V DC?

It can be used where the board requires a regulated 9V constant-voltage source and the total load is within 3W. The 85-305VAC input also supports use across a wide AC input range in control equipment.

What is the difference between the IRM-03-9S and other IRM-03 models?

Within the IRM-03 group, the options are IRM-03-3.3 at 3W, 3.3V, 900mA; IRM-03-5 at 3W, 5V, 600mA; IRM-03-9 at 3W, 9V, 333mA; IRM-03-12 at 3W, 12V, 250mA; IRM-03-15 at 3W, 15V, 200mA; and IRM-03-24 at 3W, 24V, 125mA. The IRM-03-9S matches the 3W, 9V, 333mA electrical rating, with the S version identified as SMD style.

Is the IRM-03-9S suitable for outdoor or harsh-temperature use?

Its operating temperature range is -30°C to +85°C, so it covers a wide temperature span for equipment design. No IP rating is listed, so it should be treated as a component for protected indoor enclosures or for outdoor use only inside an enclosure that provides environmental protection.

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