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Mean Well SFTN02N-05 DC-DC Converter - 2W - 21.6~26.4V in 5V out 400mA

Name: Mean Well SFTN02N-05 DC-DC Converter - 2W - 21.6~26.4V in 5V out 400mA
Brand: Mean Well
SKU: SFTN02N-05
Price: 5.94 USD
Availability: InStock

SKU SFTN02N-05

$5.94 USD

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Overview

SFTN02N-05 is the 5V output model of this series: rated power 2W, typical efficiency 78%.

SFTN02 series is 2W isolated and unregulated module type DC-DC converter with SMD package. It features international standard pins, a high efficiency up to 82%, wide working temperature range -40~+100℃, 3KVDC I/P-O/P isolation voltage, compliance to BS EN/EN55032 radiated Class A without additional components, short circuit protection, etc. The models account for different input voltage 5V/12V/24V±10%, and various output voltage, 5V/12V/15V for single output which are suitable for all kinds of systems, such as industrial control, telecommunication field, distributed power architecture, and so on.

Features

SMD package with industry standard pinout
Operating temperature range -40 ~ +100℃
Comply to BS EN/EN55032 radiated Class A without additional components
High efficiency up to 82%
Protection: Short circuit
3KVDC I/O isolation
Low cost
Optional reel packing
3 years warranty

Specifications

SFTN02N-05Specifications from the official datasheet (2026-09-15 edition)

INPUT

INPUT VOLTAGE (RANGE): Normal 24V (21.6 ~ 26.4V)
INPUT CURRENT NO LOAD: 15mA
INPUT CURRENT FULL LOAD: 107mA
VOLTAGE RANGE: 21.6 ~ 26.4Vdc
SURGE VOLTAGE (100ms max.): 5Vin models : 9Vdc 12Vin models : 16Vdc 24Vin models : 30Vdc
FILTER: Internal capacitor
PROTECTION: Fuse recommended. 5Vin models: 800mA Slow-Blow Type 12Vin models: 300mA Slow-Blow Type 24Vin models: 170mA Slow-Blow Type
INTERNAL POWER DISSIPATION: 500mW

OUTPUT

OUTPUT VOLTAGE: 5V
OUTPUT CURRENT: 40 ~ 400mA
EFFICIENCY (TYP.): 78%
CAPACITOR LOAD (MAX.): 220μF
VOLTAGE ACCURACY: ±2.0%
RATED POWER: 2W
RIPPLE & NOISE^Note.2: 75mVp-p
LINE REGULATION^Note.3: 1.2% for 1% input variation
LOAD REGULATION^Note.4: ±8%
SWITCHING FREQUENCY (Typ.): 100KHz

PROTECTION

SHORT CIRCUIT: Standard model: 0.5 second max. Optional models (SC-suffix): Continuous

ENVIRONMENT

COOLING: Free-air convection
WORKING TEMP.: Standard model: -40 ~ +100℃ (Refer to "Derating Curve") ; Optional models (SC-suffix): -40 ~ +105℃
CASE TEMPERATURE: +105℃ max.
WORKING HUMIDITY: 20% ~ 90% RH non-condensing
STORAGE TEMP., HUMIDITY: -55 ~ +125℃, 10 ~ 95% RH non-condensing
TEMP. COEFFICIENT: 0.03% / ℃ (0 ~ 90℃)
SOLDERING TEMPERATURE: 1.5mm from case of 1 ~ 10sec./240℃ max.
VIBRATION: 10 ~ 500Hz, 2G 10min./1cycle, period for 60min. each along X, Y, Z axes

SAFETY & EMC ( Note.5,6)

SAFETY STANDARDS: EAC TP TC 020/2011 approved
WITHSTAND VOLTAGE: I/P-O/P:3KVDC
ISOLATION RESISTANCE: I/P-O/P:100M Ohms / 500VDC / 25℃/ 70% RH
ISOLATION CAPACITANCE (Typ.): 80pF
EMC EMISSION: Parameter Standard Test Level

Conducted BS EN/EN55032(CISPR32) N/A
Radiated BS EN/EN55032(CISPR32) Class A
EMC IMMUNITY: Parameter Standard Test Level

ESD BS EN/EN61000-4-2 Level 3, ±8KV air, Level 2±4KV contact
Radiated Susceptibility BS EN/EN61000-4-3 Level 2, 3V/m
EFT/Bursts BS EN/EN61000-4-4 Level 1, 0.5KV at power
Surge BS EN/EN61000-4-5 Level 2, 0.5KV Line-Line
Conducted BS EN/EN61000-4-6 Level 2, 3V(e.m.f.)
Magnetic Field BS EN/EN61000-4-8 Level 1, 1A/m

Parameter	Standard	Test Level
Conducted	BS EN/EN55032(CISPR32)	N/A
Radiated	BS EN/EN55032(CISPR32)	Class A

Parameter	Standard	Test Level
ESD	BS EN/EN61000-4-2	Level 3, ±8KV air, Level 2±4KV contact
Radiated Susceptibility	BS EN/EN61000-4-3	Level 2, 3V/m
EFT/Bursts	BS EN/EN61000-4-4	Level 1, 0.5KV at power
Surge	BS EN/EN61000-4-5	Level 2, 0.5KV Line-Line
Conducted	BS EN/EN61000-4-6	Level 2, 3V(e.m.f.)
Magnetic Field	BS EN/EN61000-4-8	Level 1, 1A/m

OTHERS

MTBF: 880Khrs min. MIL-HDBK-217F(25℃)
DIMENSION (L*W*H): 15.24*10.9*7.1mm (0.6*0.43*0.28 inch)
CASE MATERIAL: Non-Conductive black plastic (UL 94V-0 rated)
PACKING: Standard : 1.2g ; 32pcs/per tube, 3840pcs/120 tube/per carton Optional : 1.2g ; 500pcs/per reel, 2500pcs/5 reel/per carton

Test conditions and notes6

1.All parameters are specified at normal input(L:5Vdc, M:12Vdc, N:24Vdc), rated load, 25℃ 70% RH ambient.
2.Ripple & noise are measured at 20MHz by using a 12" twisted pair terminated with a 0.1μf & 47μf capacitor.
3.Line regulation is measured from low line to high line at rated load.
4.Load regulation is measured from 10% to 100% rated load.
5.The final equipment must be re-confirm that it still meet EMC directives. For guidance on how to perform these EMC tests, please refer to “EMI testing of component power supplies.”(as available on http://www.meanwell.com)
6.An external input filter capacitor is required if the module has to meet BS EN/EN61000-4-4, BS EN/EN61000-4-5. The filter capacitor Power Mate suggest: 470μF/100V.

Technical drawings

SFTN02N-05 Mechanical Specification — Mechanical Specification

SFTN02N-05 Pin Assignment — Pin Assignment

SFTN02N-05 Reflow Soldering Curve — Reflow Soldering Curve

Typical applications

Downloads

Certificates3

Mean Well SFTN02-DETN02-EMC Certificate PDF Download

Mean Well SFTN02-DETN02-CE-dec Certificate PDF Download

Mean Well SFTN02-DETN02-UK-dec Certificate PDF Download

Catalogues2

Mean Well DC-DC Catalog PDF Download

Mean Well Catalog (Industrial) PDF Download

FAQ

Can I use the SFTN02N-05 to derive 5V for embedded controllers in a 24V-class system?

Yes, this model is suited to low-power embedded controllers or logic sections that need a constant 5V output from a 21.6-26.4VDC input range. Its 2W rating means it is intended for small electronics rather than larger 5V loads.

Is the SFTN02N-05 suitable for low-power sensor or interface electronics in industrial equipment?

It can be a fit for low-power sensor, interface, or monitoring electronics that require regulated 5V output. The constant-voltage operation is useful for stable low-power circuits, provided the application stays within the 2W capacity.

Would the SFTN02N-05 work for compact automation or embedded logic boards?

It is appropriate for compact automation or embedded logic boards that need a small 5V rail and accept the 21.6-26.4VDC input range. The compact 15.24 x 10.9 x 7.1 mm dimensions are also favorable for dense board layouts.

How does the SFTN02N-05 compare with the other SFTN02N models?

Within the SFTN02N family, this version provides 5V output at 400mA with a 2W rating. The other siblings are SFTN02N-12 at 12V and 167mA, and SFTN02N-15 at 15V and 133mA. All three share the same 2W power level.

Is the SFTN02N-05 suitable for outdoor use or high-temperature industrial environments?

The listed operating temperature range is -40°C to +100°C, which supports use across a wide temperature window. However, no IP rating is provided, so the specs do not establish outdoor suitability or resistance to dust and water exposure.

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