MEAN WELL MFM-05-3.3 is an open-frame PCB-mount medical AC/DC power module with a 3.3 V output rated at 1.25 A and 4.1 W. It accepts 80–264 VAC or 113–370 VDC, requires no minimum load, and provides Class II construction with 2 × MOPP primary-secondary isolation. Peak operation and BF applications are subject to the conditions below.
Product Datasheet
Download MEAN WELL MFM-05 Datasheet (PDF)
The MFM-05 section is on PDF pages 1, 2, 3, 4. Refer to the complete mechanical drawings and notes when planning installation.
Model and Medical Application
Exact model
MFM-05-3.3; open-frame on-board AC/DC power module. The final model-code field identifies the nominal DC output voltage.
Electrical protection class
Class II, double insulation, no functional-ground (FG) connection.
Patient-protection insulation
Primary-to-secondary isolation: 2 × MOPP.
BF application
Suitable for BF applications with appropriate system consideration; the power module alone does not certify a completed medical device as BF.
Typical applications
Portable medical devices, mobile clinical workstations, medical computer monitors and examination instruments.
This compact open-frame module is intended for integration onto the equipment PCB. Apply the medical-system insulation and installation requirements to the complete assembly.
Model-Specific DC Output
DC voltage
3.3 V.
Rated continuous current
1.25 A.
Current range
0–1.25 A; no minimum load required.
Rated output power
4.1 W, as listed for this exact model.
Peak current
1.38 A, subject to the peak-load conditions below.
Peak output power
4.6 W, for a maximum of 10 seconds and subject to all duty-cycle and average-power limits.
Ripple and noise, maximum
100 mVp-p.
Voltage tolerance
±2.5%; includes set-up tolerance, line regulation and load regulation.
Line regulation
±0.3%.
Load regulation
±0.5%.
Efficiency, typical
74%.
Peak loading is limited to 33% maximum duty cycle within every 30 seconds, and average output power must not exceed this model’s rated output power. The 10-second peak specification does not remove either limit; reduce the duty further when the remaining load would otherwise exceed the permitted average.
Ripple and noise are measured at 20 MHz bandwidth with a 12-inch twisted pair terminated by 0.1 µF and 47 µF capacitors in parallel.
Input and Start-Up
AC input range
80–264 VAC, subject to low-input derating.
DC input range
113–370 VDC.
AC frequency
47–440 Hz.
Input current, typical
0.2 A at 115 VAC; 0.1 A at 230 VAC.
Cold-start inrush, typical
25 A at 115 VAC; 45 A at 230 VAC.
No-load input consumption
Less than 0.075 W.
Set-up and rise time
1000 ms set-up and 30 ms rise at both 230 VAC and 115 VAC, at full load.
Hold-up time, typical
40 ms at 230 VAC; 12 ms at 115 VAC, at full load.
Touch current
Less than 80 µA at 264 VAC; measured from primary input to DC output.
Switching frequency reference
100 kHz in the block diagram.
Unless specifically stated otherwise, catalogue parameters are measured at 230 VAC input, rated load and 25°C ambient. Typical figures are not guaranteed minimum performance values.
Protection
Short circuit and overload
Overload protection operates at 110–180% of rated output power. Hiccup mode recovers automatically after the fault is removed; short-circuit protection is also listed.
Overvoltage threshold
3.8–5 V.
Overvoltage action
Output voltage shuts off and is clamped by a zener diode.
Overtemperature action
Output shuts down and recovers automatically after temperature falls.
The overload-protection threshold is not a continuous output rating or an additional peak-load allowance. Observe the separately stated model-specific output and peak-load limits.
Cooling, Derating and Environment
Working ambient range
-40 to +85°C, with load derating.
Cooling and curve orientation
Fanless operation; the published ambient/load curve is for horizontal mounting.
Temperature/load curve for this model
-40°C: 100%; 60°C: 100%; 70°C: 70%; 80°C: 40%; 85°C: 20%.
Curve selection
All voltages output-voltage curve.
Input-voltage/load curve
At 60 Hz: 80% load at 80 VAC, rising to 100% at 100 VAC; 100% plateau from 100 to 264 VAC.
Operating humidity
20–90% RH, non-condensing.
Storage conditions
−40 to +100°C; 10–95% RH, non-condensing.
Temperature coefficient
±0.03%/°C over 0–60°C.
Vibration
10–500 Hz, 5 G, 10 minutes per cycle, 60 minutes each along X, Y and Z.
Operating altitude
Up to 5,000 m.
High-altitude temperature reduction
Above 2,000 m, reduce the allowable ambient temperature by 3.5°C per additional 1,000 m for this fanless module.
Use the complete temperature and input-voltage curves for intermediate conditions, and apply input, temperature, altitude and peak-load restrictions together. A wide operating-temperature range does not mean full rated load throughout that range.
Mechanical Dimensions and PCB Connections
Dimensions, L × W × H
42 × 22.3 × 20.5 mm, as listed in the specification.
Drawing units and tolerance
Millimetres; general tolerance ±0.5 mm.
Input pins, top view
With the input pins on the left as drawn: upper pin AC/N; lower pin AC/L.
Output pins, top view
With the output pins on the right as drawn: upper pin +V; lower pin −V.
Pin spacing
Input pair 10.75 mm; output pair 8 mm.
Pin-to-board edge references
Each pin column is 1.75 mm from its adjacent left or right board edge; both lower pins are 1.9 mm from the bottom edge in the top view.
Side-view detail
The side view marks a 16 mm vertical dimension and terminal-detail dimensions of 4.5 mm, 3.5 mm, 1.8 mm and 1.05 mm. Use the full drawing for the footprint and terminal profile.
Soldering limits
Wave soldering: 265°C for 5 seconds maximum; manual soldering: 390°C for 3 seconds maximum.
Use the stated top-view orientation when locating AC and DC connections. Follow the manufacturer’s installation instructions for the completed assembly. The assigned pages identify no separate orderable mating connector, mounting bracket or accessory kit. FS1 is a drawing reference, not a complete spare-part ordering code.
Safety and EMC Conditions
Listed medical safety approvals
IEC60601-1:2005+A1; TUV BS EN/EN60601-1:2006+A1+A12+A2; ANSI/AAMI ES60601-1:2005+A2; CAN/CSA C22.2 No.60601-1:2014+A2; EAC TP TC004.
Other safety applicability
Design reference to BS EN/EN60335-1 is available by request; the specification does not list this as the standard approved configuration.
Input-to-output withstand voltage
4 kVAC.
Input-to-output insulation resistance
100 MΩ at 500 VDC, 25°C and 70% RH.
Conducted and radiated emissions
BS EN/EN55011 (CISPR11), Class B, for Class II configuration.
Harmonic current
BS EN/EN61000-3-2, Class A.
Voltage flicker
BS EN/EN61000-3-3 is listed; no numerical test level is specified.
Immunity framework
BS EN/EN55035 and BS EN/EN60601-1-2.
ESD
BS EN/EN61000-4-2: Level 4, 15 kV air and 8 kV contact.
RF field susceptibility
BS EN/EN61000-4-3: Level 3, 10 V/m over 80 MHz–2.7 GHz; Table 9 proximity-field levels 9–28 V/m over 385 MHz–5.78 GHz.
EFT / burst
BS EN/EN61000-4-4: Level 3, 2 kV.
Surge
BS EN/EN61000-4-5: Level 3, 1 kV line-to-line.
Conducted susceptibility
BS EN/EN61000-4-6: Level 3, 10 V.
Magnetic-field immunity
BS EN/EN61000-4-8: Level 4, 30 A/m.
Voltage dips and interruptions
BS EN/EN61000-4-11: 100% dip for 1 period; 30% dip for 25 periods; 100% interruption for 250 periods.
This power supply is a component for installation in final equipment. Reconfirm the completed equipment’s EMC compliance and medical-system suitability; component approval and primary-secondary insulation do not establish every protection measure of the complete system.
Weight, Reliability and Catalogue Reference
Single-unit catalogue weight
18 g (0.018 kg), explicitly listed in PACKING. This is a catalogue unit-weight reference, not a measured shipping weight.
Packing reference
270 pieces / 5.8 kg / 0.94 CUFT.
Minimum MTBF estimates
9337.3 thousand hours by Telcordia SR-332 (Bellcore); 1799.5 thousand hours by MIL-HDBK-217F at 25°C.
Catalogue typical lifetime
Greater than 52,000 hours typical, as listed on the catalogue feature page; not a guaranteed service life.
Catalogue warranty
3-year manufacturer warranty, subject to the applicable terms.
Specification version
MFM-05-SPEC dated 2024-10-30; combined catalogue pages 1–4.
Rating convention
The displayed power, current and peak values preserve the catalogue’s printed precision.
MTBF values are statistical estimates under the stated methods and are not a guaranteed operating life.
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