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Mean Well

Mean Well NFM-05-3.3 Power Supply 5W 3.3V 1.25A

SKU NFM-05-3.3
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Overview

NFM-05-3.3 is the 3.3V output model of this series: rated current 1.25A, rated power 4.125W, typical efficiency 67%.

Features

  • Universal AC input / Full range
  • Protections: Short circuit / Overload / Over voltage / Over temperature
  • Ultra-miniature size, light weight
  • Cooling by free air convection
  • Isolation classⅡ
  • Medical safety approved (2 x MOPP between primary to secondary)
  • No load power consumption<0.5W
  • 100% full load burn-in test
  • Fixed switching frequency at 67KHz
  • High reliability
  • Suitable for BF application with appropriate system consideration
  • 3 years warranty

Specifications

NFM-05-3.3Specifications from the official datasheet (2022-09-20 edition)

OUTPUT

DC VOLTAGE
3.3V
RATED CURRENT
1.25A
CURRENT RANGE
0 ~ 1.25A
RATED POWER
4.125W
RIPPLE & NOISE (max.)Note.2
80mVp-p
VOLTAGE ADJ. RANGE
3 ~ 3.63V
VOLTAGE TOLERANCENote.3
±2.0%
LINE REGULATION
±1.0%
LOAD REGULATION
±1.0%
SETUP, RISE TIME
1000ms, 20ms/230VAC 1000ms, 20ms/115VAC at full load
HOLD UP TIME (Typ.)
100ms/230VAC 24ms/115VAC at full load

INPUT

VOLTAGE RANGE
85 ~ 264VAC 120 ~ 370VDC
FREQUENCY RANGE
47 ~ 440Hz
EFFICIENCY (Typ.)
67%
AC CURRENT (Typ.)
0.12A/115VAC 0.08A/230VAC
INRUSH CURRENT (Typ.)
COLD START 25A/115VAC 45A/230VAC
LEAKAGE CURRENTNote.6
Touch current < 80μA/264VAC

PROTECTION

OVERLOAD
Above 105% rated output power Protection type : Hiccup mode, recovers automatically after fault condition is removed
OVER VOLTAGE
3.8 ~ 4.95V Protection type : Shut off o/p voltage, clamping by zener diode
OVER TEMPERATURENote.5
Tj 145℃ typically (U1) detect on main control IC Protection type : Shut down o/p voltage, recovers automatically after temperature goes down

ENVIRONMENT

WORKING TEMP.
-20 ~ +70℃ (Refer to "Derating Curve")
WORKING HUMIDITY
20 ~ 90% RH non-condensing
STORAGE TEMP., HUMIDITY
-40 ~ +85℃, 10 ~ 95% RH
TEMP. COEFFICIENT
±0.03%/℃ (0 ~ 50℃)
VIBRATION
10 ~ 500Hz, 2G 10min./1cycle, period for 60min. each along X, Y, Z axes

SAFETY & EMC (Note 4)

SAFETY STANDARDS
ANSI/AAMI ES60601-1,TUV EN60601-1, IEC60601-1, EAC TP TC 004 approved
ISOLATION LEVEL
Primary-Secondary: 2xMOPP
WITHSTAND VOLTAGE
I/P-O/P:4KVAC
ISOLATION RESISTANCE
I/P-O/P:100M Ohms / 500VDC / 25℃/ 70% RH
EMC EMISSION
Compliance to EN55011(CISPR11),EN55032 (CISPR32) Class B, EN61000-3-2,-3, EAC TP TC 020
EMC IMMUNITY
Compliance to EN61000-4-2,3,4,5,6,8,11, EN55035, EN60601-1-2, EN61204-3, medical level, EAC TP TC 020

OTHERS

MTBF
738.7Khrs min. MIL-HDBK-217F (25℃)
DIMENSION
58*45*19.1mm (L*W*H)
PACKING
0.03Kg; 120pcs/5.0Kg/0.94CUFT
Test conditions and notes7
  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 0.1uf & 47uf 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. The final equipment must be re-confirmed that it still meets EMC directives.
  5. 5. The over temperature protection (OTP) is the built-in function of the control IC (U1). The activating level described above is based on the specification provided by the IC manufacturer.
  6. 6. Touch current was measured from primary input to DC output.
  7. 7. 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

NFM-05-3.3 Mechanical Specification
Mechanical Specification
NFM-05-3.3 Block Diagram
Block Diagram
NFM-05-3.3 Derating Curve
Derating Curve

Downloads

FAQ

Can I use the NFM-05-3.3 for a 3.3V embedded controller or SBC?

This model provides 3.3V constant voltage at up to 1.25A, with 4.125W total output. That suits low-power embedded controllers, SBCs, and logic boards that need a regulated 3.3V rail within those limits.

Is the NFM-05-3.3 suitable for industrial communication or I/O electronics that run on 3.3V?

It can fit 3.3V communication, interface, or I/O electronics as long as the load stays at or below 1.25A and 4.125W. Its constant-voltage output makes it appropriate for equipment designed around a fixed 3.3V input.

Would this work for a compact 3.3V control board inside automation equipment?

Yes, for small 3.3V control or processing boards that do not exceed 1.25A. The compact 58.0 x 45.0 x 19.1 mm size also helps when the power section has limited internal space.

Can the NFM-05-3.3 be used where AC input standards vary by site?

The input range is 85-264VAC, which supports a wide AC input span. That makes it practical for 3.3V equipment deployed across installations using different mains voltages.

How does the NFM-05-3.3 compare with the rest of the NFM family?

In the lower-power group, the series includes NFM-05-3.3 at 4.125W, 3.3V, 1.25A; NFM-05-5 at 5W, 5V, 1A; NFM-05-12 at 5.04W, 12V, 0.42A; NFM-05-15 at 4.95W, 15V, 0.33A; and NFM-05-24 at 5.52W, 24V, 0.23A. The 10W group includes NFM-10-3.3 at 8.25W, 3.3V, 2.5A; NFM-10-5 at 10W, 5V, 2A; NFM-10-12 at 10.2W, 12V, 0.85A; NFM-10-15 at 10.05W, 15V, 0.67A; and NFM-10-24 at 10.08W, 24V, 0.42A. The 15W group includes NFM-15-3.3 at 11.5W, 3.3V, 3.5A; NFM-15-5 at 15W, 5V, 3A; NFM-15-12 at 15W, 12V, 1.25A; NFM-15-15 at 15W, 15V, 1A; and NFM-15-24 at 15.12W, 24V, 0.63A. The larger 20W models include NFM-20-3.3 at 14.85W, 3.3V, 4.5A; NFM-20-5 at 22W, 5V, 4.4A; NFM-20-12 at 21.6W, 12V, 1.8A; NFM-20-15 at 14.85W; and NFM-20-24 at 22.08W, 24V, 0.92A.

Can the NFM-05-3.3 be used in indoor panels with temperature swings?

The specified operating range is -20°C to +70°C, so the unit is rated across that temperature span. No IP rating is listed in the provided specs, so enclosure sealing against dust or water is not specified.

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Mean Well

Mean Well NFM-05-3.3 Power Supply 5W 3.3V 1.25A

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NFM-05-3.3 is the 3.3V output model of this series: rated current 1.25A, rated power 4.125W, typical efficiency 67%.

Features

  • Universal AC input / Full range
  • Protections: Short circuit / Overload / Over voltage / Over temperature
  • Ultra-miniature size, light weight
  • Cooling by free air convection
  • Isolation classⅡ
  • Medical safety approved (2 x MOPP between primary to secondary)
  • No load power consumption<0.5W
  • 100% full load burn-in test
  • Fixed switching frequency at 67KHz
  • High reliability
  • Suitable for BF application with appropriate system consideration
  • 3 years warranty
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