MEAN WELL IRM-20 series: PCB-Mount AC/DC Power Module - IRM-20-3.3

Description

MEAN WELL IRM-20-3.3 is a silicone-potted PCB-mount industrial AC/DC power module rated at 3.3 V, 4.5 A and 14.85 W. It accepts 85–305 VAC or 120–430 VDC and uses free-air convection. Follow the model-specific load, temperature and installation limits below.

Product Datasheet

Download MEAN WELL IRM-20 Datasheet (PDF)

The IRM-20 section is on PDF pages 22, 23, 24. Refer to the complete mechanical drawings and notes when planning installation.

Model and Construction

Complete model IRM-20-3.3; PCB-mount AC/DC industrial power module. The final model-code field specifies the nominal DC output voltage.
Construction 94V-0 flame-retardant plastic case with silicone potting. The catalogue describes basic resistance to dust and moisture; no IP rating is specified.
Electrical class Class II design with no functional-ground (FG) pin.
Limited power source The family feature page states that the series passes LPS.
Typical applications Industrial electrical and mechanical equipment, factory automation and hand-held electronic devices.

Model-Specific DC Output

DC voltage 3.3 V.
Rated current 4.5 A.
Current range 0–4.5 A.
Rated output power 14.85 W.
Ripple and noise, maximum 200 mVp-p.
Voltage tolerance ±2.5%; includes set-up tolerance, line regulation and load regulation.
Line regulation ±0.5%.
Load regulation ±1%.
Efficiency, typical 76%.

Ripple and noise are measured at 20 MHz bandwidth using a 12-inch twisted pair terminated with parallel 0.1 µF and 47 µF capacitors. Use the continuous voltage, current and power ratings together; protection thresholds are not output-power allowances.

Input and Start-Up

AC input 85–305 VAC; observe the low-input derating curve.
DC input 120–430 VDC.
Frequency 47–440 Hz.
AC current, typical 0.6 A at 115 VAC; 0.4 A at 230 VAC; 0.3 A at 277 VAC.
Cold-start inrush, typical 20 A at 115 VAC; 40 A at 230 VAC.
Leakage current Less than 0.25 mA at 277 VAC.
No-load consumption Less than 0.1 W.
Set-up and rise time 1000 ms set-up; 20 ms rise at full load. Both 230 VAC and 115 VAC are listed.
Hold-up time, typical 40 ms at 230 VAC; 8 ms at 115 VAC, at full load.
Switching frequency reference 65 kHz in the block diagram.

Unless otherwise specified, catalogue parameters are measured at 230 VAC input, rated load and 25°C ambient.

Protection

Short circuit and overload Overload range: 115–160% of rated output power. Hiccup mode recovers automatically after the fault is removed; short-circuit protection is listed.
Overvoltage threshold 3.8–4.46 V.
Overvoltage response Output voltage shuts off and is clamped by a zener diode.

Cooling, Derating and Environment

Cooling Free-air convection; published temperature/load curves use horizontal mounting.
Working ambient −30 to +85°C, with load derating.
Temperature/load anchors -30°C: 100%; 45°C: 100%; 60°C: 70%; 70°C: 50%; 80°C: 20%; 85°C: 5%.
Input-voltage/load anchors At 60 Hz: 85 VAC gives 80% load; 115 VAC gives 100%; the 100% plateau extends to 305 VAC.
Operating humidity 20–90% RH, non-condensing.
Storage conditions −40 to +85°C; 10–95% RH.
Temperature coefficient ±0.03%/°C over 0–50°C.
Vibration 10–500 Hz, 2 G, 10 minutes per cycle, 60 minutes each along X, Y and Z.
Operating-altitude table entry 2,000 m. Apply the separate standards-specific overvoltage-category conditions below.
Altitude footnote For operation above 2,000 m where the applicable certification permits it, the catalogue specifies a 3.5°C reduction per additional 1,000 m for fanless models. This footnote does not extend a certification altitude limit.

Combine the input-voltage and temperature restrictions. The +85°C endpoint is a derated operating point, not a full-load rating. Use the complete plotted curves for intermediate conditions.

Mechanical Dimensions and PCB Installation

Dimensions, L × W × H 52.4 × 27.2 × 24 mm.
Case drawing Case No. 219A; bottom view. General dimensional tolerance ±0.5 mm.
AC pins, bottom view With the input pins at the left as drawn: upper AC/N; lower AC/L.
DC pins, bottom view Right-hand pair: upper −V; lower +V.
Pin spacing Input pair 20.8 mm; output pair 8 mm; input/output pin-column spacing 45 mm.
Footprint offsets The left pin column is 3.4 mm from the left case edge; the upper input/output pins are 3.2 mm below the top edge in the bottom view. Follow the complete drawing.
Pins Diameter 1.0 mm; projection 3.5 ±1 mm.
Soldering Wave: 265°C for 5 seconds maximum. Manual: 390°C for 3 seconds maximum.

This model is soldered to the equipment PCB. Follow the manufacturer’s installation manual and the bottom-view footprint. The assigned pages provide no separate orderable mating connector, mounting bracket or accessory kit; no screw-terminal option is identified for this exact model.

Safety and EMC

Listed safety approvals IEC62368-1; IEC61558-1/-2-16; UL62368-1; TUV BS EN/EN62368-1; BS EN/EN61558-1/-2-16; EAC TP TC004; BSMI CNS15598-1.
Overvoltage category under 61558 IEC/EN61558-1/-2-16: OVC III, altitude up to 2,000 m.
Overvoltage category under 62368 IEC/EN/UL62368-1: OVC II, altitude up to 2,000 m.
Input-to-output withstand 4.2 kVAC.
Input-to-output insulation 100 MΩ at 500 VDC, 25°C and 70% RH.
Conducted and radiated emissions BS EN/EN55032 (CISPR32) and CNS15936, Class B. The series feature page states EMI Class B without additional components.
Harmonic current and flicker BS EN/EN61000-3-2 Class A; BS EN/EN61000-3-3 listed without a numerical test level.
Immunity framework BS EN/EN55035 and BS EN/EN61000-6-2.
ESD BS EN/EN61000-4-2: Level 3, 8 kV air; Level 2, 4 kV contact; criterion A.
Radiated susceptibility BS EN/EN61000-4-3: Level 3, criterion A.
EFT / burst BS EN/EN61000-4-4: Level 3, criterion A.
Surge BS EN/EN61000-4-5: Level 4, 2 kV L–N, criterion A.
Conducted susceptibility BS EN/EN61000-4-6: Level 3, criterion A.
Magnetic field BS EN/EN61000-4-8: Level 4, criterion A.
Voltage dips and interruptions BS EN/EN61000-4-11: greater than 95% dip for 0.5 period, 30% dip for 25 periods, and greater than 95% interruption for 250 periods.

The final equipment still needs EMC compliance confirmation. Apply the listed safety standard and altitude conditions to the actual installation; the general Class II description does not establish a medical approval.

Weight, Reliability and Catalogue Reference

Single-unit catalogue weight 50 g (0.05 kg), explicitly listed in PACKING; a catalogue reference rather than measured shipping weight.
Packing reference 240 pieces / 13 kg / 0.94 CUFT.
Minimum MTBF estimates 10656.2 thousand hours, Telcordia SR-332 (Bellcore); 970.3 thousand hours, MIL-HDBK-217F at 25°C.
Manufacturer warranty 3 years, subject to the applicable manufacturer terms.
Specification version IRM-20-SPEC 2025-11-21; combined catalogue pages 22–24.

MTBF is a statistical estimate under the stated methods, not a guaranteed service life.

MEAN WELL IRM-20 series: PCB-Mount AC/DC Power Module - IRM-20-3.3

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MEAN WELL IRM-20-3.3 is a silicone-potted PCB-mount industrial AC/DC power module rated at 3.3 V, 4.5 A and 14.85 W.... Read more

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    Description

    MEAN WELL IRM-20-3.3 is a silicone-potted PCB-mount industrial AC/DC power module rated at 3.3 V, 4.5 A and 14.85 W. It accepts 85–305 VAC or 120–430 VDC and uses free-air convection. Follow the model-specific load, temperature and installation limits below.

    Product Datasheet

    Download MEAN WELL IRM-20 Datasheet (PDF)

    The IRM-20 section is on PDF pages 22, 23, 24. Refer to the complete mechanical drawings and notes when planning installation.

    Model and Construction

    Complete model IRM-20-3.3; PCB-mount AC/DC industrial power module. The final model-code field specifies the nominal DC output voltage.
    Construction 94V-0 flame-retardant plastic case with silicone potting. The catalogue describes basic resistance to dust and moisture; no IP rating is specified.
    Electrical class Class II design with no functional-ground (FG) pin.
    Limited power source The family feature page states that the series passes LPS.
    Typical applications Industrial electrical and mechanical equipment, factory automation and hand-held electronic devices.

    Model-Specific DC Output

    DC voltage 3.3 V.
    Rated current 4.5 A.
    Current range 0–4.5 A.
    Rated output power 14.85 W.
    Ripple and noise, maximum 200 mVp-p.
    Voltage tolerance ±2.5%; includes set-up tolerance, line regulation and load regulation.
    Line regulation ±0.5%.
    Load regulation ±1%.
    Efficiency, typical 76%.

    Ripple and noise are measured at 20 MHz bandwidth using a 12-inch twisted pair terminated with parallel 0.1 µF and 47 µF capacitors. Use the continuous voltage, current and power ratings together; protection thresholds are not output-power allowances.

    Input and Start-Up

    AC input 85–305 VAC; observe the low-input derating curve.
    DC input 120–430 VDC.
    Frequency 47–440 Hz.
    AC current, typical 0.6 A at 115 VAC; 0.4 A at 230 VAC; 0.3 A at 277 VAC.
    Cold-start inrush, typical 20 A at 115 VAC; 40 A at 230 VAC.
    Leakage current Less than 0.25 mA at 277 VAC.
    No-load consumption Less than 0.1 W.
    Set-up and rise time 1000 ms set-up; 20 ms rise at full load. Both 230 VAC and 115 VAC are listed.
    Hold-up time, typical 40 ms at 230 VAC; 8 ms at 115 VAC, at full load.
    Switching frequency reference 65 kHz in the block diagram.

    Unless otherwise specified, catalogue parameters are measured at 230 VAC input, rated load and 25°C ambient.

    Protection

    Short circuit and overload Overload range: 115–160% of rated output power. Hiccup mode recovers automatically after the fault is removed; short-circuit protection is listed.
    Overvoltage threshold 3.8–4.46 V.
    Overvoltage response Output voltage shuts off and is clamped by a zener diode.

    Cooling, Derating and Environment

    Cooling Free-air convection; published temperature/load curves use horizontal mounting.
    Working ambient −30 to +85°C, with load derating.
    Temperature/load anchors -30°C: 100%; 45°C: 100%; 60°C: 70%; 70°C: 50%; 80°C: 20%; 85°C: 5%.
    Input-voltage/load anchors At 60 Hz: 85 VAC gives 80% load; 115 VAC gives 100%; the 100% plateau extends to 305 VAC.
    Operating humidity 20–90% RH, non-condensing.
    Storage conditions −40 to +85°C; 10–95% RH.
    Temperature coefficient ±0.03%/°C over 0–50°C.
    Vibration 10–500 Hz, 2 G, 10 minutes per cycle, 60 minutes each along X, Y and Z.
    Operating-altitude table entry 2,000 m. Apply the separate standards-specific overvoltage-category conditions below.
    Altitude footnote For operation above 2,000 m where the applicable certification permits it, the catalogue specifies a 3.5°C reduction per additional 1,000 m for fanless models. This footnote does not extend a certification altitude limit.

    Combine the input-voltage and temperature restrictions. The +85°C endpoint is a derated operating point, not a full-load rating. Use the complete plotted curves for intermediate conditions.

    Mechanical Dimensions and PCB Installation

    Dimensions, L × W × H 52.4 × 27.2 × 24 mm.
    Case drawing Case No. 219A; bottom view. General dimensional tolerance ±0.5 mm.
    AC pins, bottom view With the input pins at the left as drawn: upper AC/N; lower AC/L.
    DC pins, bottom view Right-hand pair: upper −V; lower +V.
    Pin spacing Input pair 20.8 mm; output pair 8 mm; input/output pin-column spacing 45 mm.
    Footprint offsets The left pin column is 3.4 mm from the left case edge; the upper input/output pins are 3.2 mm below the top edge in the bottom view. Follow the complete drawing.
    Pins Diameter 1.0 mm; projection 3.5 ±1 mm.
    Soldering Wave: 265°C for 5 seconds maximum. Manual: 390°C for 3 seconds maximum.

    This model is soldered to the equipment PCB. Follow the manufacturer’s installation manual and the bottom-view footprint. The assigned pages provide no separate orderable mating connector, mounting bracket or accessory kit; no screw-terminal option is identified for this exact model.

    Safety and EMC

    Listed safety approvals IEC62368-1; IEC61558-1/-2-16; UL62368-1; TUV BS EN/EN62368-1; BS EN/EN61558-1/-2-16; EAC TP TC004; BSMI CNS15598-1.
    Overvoltage category under 61558 IEC/EN61558-1/-2-16: OVC III, altitude up to 2,000 m.
    Overvoltage category under 62368 IEC/EN/UL62368-1: OVC II, altitude up to 2,000 m.
    Input-to-output withstand 4.2 kVAC.
    Input-to-output insulation 100 MΩ at 500 VDC, 25°C and 70% RH.
    Conducted and radiated emissions BS EN/EN55032 (CISPR32) and CNS15936, Class B. The series feature page states EMI Class B without additional components.
    Harmonic current and flicker BS EN/EN61000-3-2 Class A; BS EN/EN61000-3-3 listed without a numerical test level.
    Immunity framework BS EN/EN55035 and BS EN/EN61000-6-2.
    ESD BS EN/EN61000-4-2: Level 3, 8 kV air; Level 2, 4 kV contact; criterion A.
    Radiated susceptibility BS EN/EN61000-4-3: Level 3, criterion A.
    EFT / burst BS EN/EN61000-4-4: Level 3, criterion A.
    Surge BS EN/EN61000-4-5: Level 4, 2 kV L–N, criterion A.
    Conducted susceptibility BS EN/EN61000-4-6: Level 3, criterion A.
    Magnetic field BS EN/EN61000-4-8: Level 4, criterion A.
    Voltage dips and interruptions BS EN/EN61000-4-11: greater than 95% dip for 0.5 period, 30% dip for 25 periods, and greater than 95% interruption for 250 periods.

    The final equipment still needs EMC compliance confirmation. Apply the listed safety standard and altitude conditions to the actual installation; the general Class II description does not establish a medical approval.

    Weight, Reliability and Catalogue Reference

    Single-unit catalogue weight 50 g (0.05 kg), explicitly listed in PACKING; a catalogue reference rather than measured shipping weight.
    Packing reference 240 pieces / 13 kg / 0.94 CUFT.
    Minimum MTBF estimates 10656.2 thousand hours, Telcordia SR-332 (Bellcore); 970.3 thousand hours, MIL-HDBK-217F at 25°C.
    Manufacturer warranty 3 years, subject to the applicable manufacturer terms.
    Specification version IRM-20-SPEC 2025-11-21; combined catalogue pages 22–24.

    MTBF is a statistical estimate under the stated methods, not a guaranteed service life.

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