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Mean Well

Mean Well MSP-100-3.3 Power Supply 66W 3.3V 20A

built-in active PFCmedical safety approvedhigh efficiencyno load power consumption < 0.5~0.8W
SKU MSP-100-3.3
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Select model — 5 in this family

MSP-100-3.3
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Overview

MSP-100-3.3 is the 3.3V output model of this series: rated current 20A, rated power 66W, typical efficiency 78%.

Features

  • Universal AC input / Full range
  • Built-in active PFC function
  • High efficiency up to 90%
  • Withstand 300VAC surge input for 5 seconds
  • Protections: Short circuit / Overload / Over voltage
  • Protections: Over temperature (optional)
  • Cooling by free air convection
  • 1U low profile 38mm
  • Medical safety approved (MOOP level)
  • Built-in remote ON-OFF control
  • No load power consumption<0.5W
  • All using 105℃ long life electrolytic capacitors
  • 5 years warranty

Specifications

MSP-100-3.3Specifications from the official datasheet (2025-03-17 edition)

OUTPUT

DC VOLTAGE
3.3V
RATED CURRENT
20A
CURRENT RANGE
0 ~ 20A
RATED POWER
66W
RIPPLE & NOISE (max.)Note.2
80mVp-p
VOLTAGE ADJ. RANGE
3.1 ~ 3.8V
VOLTAGE TOLERANCENote.3
+2.5,-3.5%
LINE REGULATION
±0.5%
LOAD REGULATION
±2.0%
SETUP, RISE TIME
2500ms, 100ms/230VAC 2500ms, 100ms/115VAC at full load
HOLD UP TIME (Typ.)
50ms/230VAC 20ms/115VAC at full load

INPUT

VOLTAGE RANGENote.5
85 ~ 264VAC 120 ~ 370VDC
FREQUENCY RANGE
47 ~ 63Hz
POWER FACTOR (Typ.)
PF>0.95/230VAC PF>0.98/115VAC at full load
EFFICIENCY (Typ.)
78%
AC CURRENT (Typ.)
1.2A/115VAC 0.6A/230VAC
INRUSH CURRENT (Typ.)
35A/115VAC 65A/230VAC
LEAKAGE CURRENTNote.6
Earth leakage current < 300μA/264VAC , Touch leakage current < 100μA/264VAC

PROTECTION

OVERLOAD
105 ~ 135% rated output power Protection type : Constant current limiting for Vo=50 ~ 100% of rated voltage, recovers automatically after fault condition is removed
OVER VOLTAGE
3.96 ~ 4.62V Protection type : Shut down o/p voltage, re-power on to recover
OVER TEMPERATURE
Shut down o/p voltage, recovers automatically after temperature goes down

FUNCTION

REMOTE CONTROL
RC+/RC- : 0 ~ 0.8V= power on ; 4 ~ 10V = power off

ENVIRONMENT

WORKING TEMP.
-40 ~ +60℃ (Refer to "Derating Curve")
WORKING HUMIDITY
20 ~ 90% RH non-condensing
STORAGE TEMP., HUMIDITY
-40 ~ +85℃, 10 ~ 95% RH
TEMP. COEFFICIENT
±0.04%/℃ (0 ~ 50℃)
VIBRATION
10 ~ 500Hz, 5G 10min./1cycle, 60min. each along X, Y, Z axes

SAFETY & EMC

SAFETY STANDARDSNote.4
IEC 60601-1:2005+A1+A2, ANSI/AAMI ES 60601-1:2005+A2, CAN/CSA C22.2 No. 60601-1:2014+A2, EAC TP TC 004 approved Design refer to BS EN/EN60335-1, BS EN/EN 62368-1(by request)
ISOLATION LEVEL
Primary-Secondary: 2×MOOP, Primary-Earth: 1×MOOP, Secondary-Earth: 1×MOOP
WITHSTAND VOLTAGE
I/P-O/P:4KVAC I/P-FG:2KVAC O/P-FG:0.5KVAC
ISOLATION RESISTANCE
I/P-O/P, I/P-FG, O/P-FG:100M Ohms / 500VDC / 25℃/ 70% RH
EMC EMISSION
Compliance to BS EN/EN55011 (CISPR11) Class B, BS EN/EN61000-3-2,-3, EAC TP TC 020
EMC IMMUNITY
Compliance to BS EN/ EN61000-4-2,3,4,5,6,8,11, BS EN/ EN55035, BS EN/ EN60601-1-2 , EAC TP TC 020

OTHERS

MTBF
2272.8K hrs min. Telcordia SR-332 (Bellcore) ; 352.4K hrs min. MIL-HDBK-217F (25℃)
DIMENSION
159*97*38mm (L*W*H)
PACKING
0.55Kg; 24pcs/ 14.3Kg/0.9CUFT
Test conditions and notes8
  1. 1. All parameters NOT specially mentioned are measured at 230VAC input, rated load and 25℃ of ambient temperature.
  2. 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. 3. Tolerance : includes set up tolerance, line regulation and load regulation.
  4. 4. The power supply is considered a component which will be installed into a final equipment. All the EMC tests are been executed by mounting the unit on a 360mm*360mm metal plate with 1mm of thickness. The final equipment must be re-confirmed that it still meets 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 )
  5. 5. Derating may be needed under low input voltages. Please check the derating curve for more details.
  6. 6. Touch current was measured from primary input to DC output.
  7. 7. When the input voltage is less than 40VAC, the SPS may exhibit degradation of performance. The final product manufacturers must re-confirm this deviation that does not affect basic safety or essential performance.
  8. 8. 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

MSP-100-3.3 Mechanical Specification
Mechanical Specification
MSP-100-3.3 Block Diagram
Block Diagram
MSP-100-3.3 Derating Curve
Derating Curve

Downloads

FAQ

Can I use the MSP-100-3.3 for 3.3V embedded processors or logic boards?

Yes, if the system requires a constant 3.3V DC rail and the total draw stays within 20A. This model is rated for 66W, so it is intended for higher-current 3.3V electronics rather than higher-voltage loads.

Is the MSP-100-3.3 suitable for powering 3.3V industrial control electronics?

It can fit industrial control electronics that run directly from 3.3V constant voltage and need up to 20A. Because the output is 66W total, it is best matched to low-voltage digital hardware sized for that 3.3V and 20A limit.

Can this model be used for high-current 3.3V test, instrumentation, or communications boards?

Yes, it is a reasonable option for 3.3V boards in test, instrumentation, or communications systems when the load needs constant voltage and remains at or below 66W. The available output is 3.3V with up to 20A current capacity.

Does the MSP-100-3.3 support outdoor use or only protected indoor use?

The operating temperature spec is -40°C to +60°C, so the unit is rated across a wide temperature range. However, no IP rating is provided, which means the supplied specs do not confirm weather exposure or outdoor ingress protection.

How does the 3.3V version compare with other MSP-100 outputs?

The MSP-100-3.3 is the low-voltage, high-current option in this group at 66W, 3.3V, and 20A. Other MSP-100 outputs are 5V 17A 85W, 7.5V 13.5A 101.3W, 12V 8.5A 102W, 15V 7A 105W, 24V 4.5A 108W, 36V 2.9A 104.4W, and 48V 2.2A 105.6W.

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Mean Well MSP-100-3.3 Power Supply 66W 3.3V 20A
Mean Well

Mean Well MSP-100-3.3 Power Supply 66W 3.3V 20A

Log in to see price

MSP-100-3.3 is the 3.3V output model of this series: rated current 20A, rated power 66W, typical efficiency 78%.

Features

  • Universal AC input / Full range
  • Built-in active PFC function
  • High efficiency up to 90%
  • Withstand 300VAC surge input for 5 seconds
  • Protections: Short circuit / Overload / Over voltage
  • Protections: Over temperature (optional)
  • Cooling by free air convection
  • 1U low profile 38mm
  • Medical safety approved (MOOP level)
  • Built-in remote ON-OFF control
  • No load power consumption<0.5W
  • All using 105℃ long life electrolytic capacitors
  • 5 years warranty

Model

  • 100W 3.3V
  • 200W 3.3V
  • 300W 3.3V
  • 450W 3.3V
  • 600W 3.3V
View product

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