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Mean Well SCWN03W8-03 DC-DC Converter - 3W 9~75V DC in 3.3V out 909mA

8:1(9~75VDC) ultra-wide input rangeno minimum load required3KVdc I/O isolation

SKU SCWN03W8-03

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Overview

SCWN03W8-03 is the 3.3V output model of this series: rated power 3W, typical efficiency 74%.

SCWN03W8 and DCWN03W8 series are 3W isolated and regulated module type DC-DC converter with DIP24 package. It features intermationaional standard pins, a high efficiency up to 84%, wide working temperature range -40~+95℃, 3KVdc I/P-O/P isolation voltage, Compliance to BS EN/EN55032 radiated Class B without additional components, continuous-mode short circuit protection, 8:1(9~75V) ultra-wide input range, and various output voltage, 3.3V/5V/12V/15V for single output and ±5V/±12V/±15V for dual outputs, which are suitable for all kinds of systems, such as industrial control, telecommunication field, distributed power architecture, and so on.

Features

DIP24 package with industry standard pinout
8:1(9~75Vdc) ultra-wide input range
Operating temperature range -40 ~ +95℃
No minimum load required
Comply to BS EN/EN55032 radiated Class B without additional components
High efficiency up to 84%
Protections: Short circuit (Continuous) / Overload / Over voltage / UVLO
Remote ON/OFF control (Optional)
3KVdc I/O isolation
3 years warranty

Specifications

SCWN03W8-03Specifications from the official datasheet (2025-07-17 edition)Download datasheet PDF

INPUT

INPUT VOLTAGE (RANGE): Nominal 12V, 24V,36V,48V,72V (9 ~ 75V)
INPUT CURRENT NO LOAD: 5mA
INPUT CURRENT FULL LOAD: 56mA
VOLTAGE RANGE: 9~75Vdc
SURGE VOLTAGE (100ms max.): 100Vdc
FILTER: Pi type
PROTECTION (Typ.): 1A Fast-Acting Type

OUTPUT

OUTPUT VOLTAGE: 3.3V
OUTPUT CURRENT: 600mA
EFFICIENCY (TYP.): 74%
CAPACITOR LOAD (MAX.): 600μF
VOLTAGE ACCURACY: ±2% for 3.3Vo, ±1.5% for others
RATED POWER: 3W
RIPPLE & NOISE^Note.2: 100mVp-p
LINE REGULATION^Note.3: ±0.5%
LOAD REGULATION^Note.4: Single output models:±0.5% ; Dual output models:±1.0%
CROSS DEGUIATION: ±5% @ 25%~100% Load only for dual output
SWITCHING FREQUENCY (Typ.): 200KHz

PROTECTION

SHORT CIRCUIT: Protection type : Continuous, automatic recovery
OVERLOAD: 110 ~ 230% rated output power Protection type : Hiccup mode, recovers automatically after fault condition is removed
OVER VOLTAGE: Protection type : Clamp by zener diode
UNDER VOLTAGE LOCKOUT (Typ.) Start-up voltage: 8.8Vdc
UNDER VOLTAGE LOCKOUT (Typ.) Shutdown voltage: 8Vdc

ENVIRONMENT

COOLING: Free-air convection
WORKING TEMP.: -40 ~ +95℃ (Refer to "Derating Curve")
CASE TEMPERATURE: +115℃ max.
WORKING HUMIDITY: 20% ~ 90% RH non-condensing
STORAGE TEMP., HUMIDITY: -40 ~ +125℃, 10 ~ 95% RH non-condensing
TEMP. COEFFICIENT: ±0.05% / ℃ max. (0 ~ 85℃)
SOLDERING TEMPERATURE: 1.5mm from case of 1 ~ 3sec./260℃ max.
VIBRATION: 10 ~ 500Hz, 2G 10min./1cycle, period for 60min. each along X, Y, Z axes

SAFETY & EMC (Note.5)

SAFETY STANDARDS: EAC TP TC 020/2011 approved
WITHSTAND VOLTAGE: I/P-O/P:3KVdc
ISOLATION RESISTANCE: I/P-O/P:1000M Ohms / 500Vdc / 25℃/ 70% RH
ISOLATION CAPACITANCE (Typ.): 1000pF
EMC EMISSION: Parameter Standard Test Level

Conducted BS EN/EN55032 Class A without additional components Class B with additional components
Radiated BS EN/EN55032 Class B without additional components
EMC IMMUNITY: Parameter Standard Test Level

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

Parameter	Standard	Test Level
Conducted	BS EN/EN55032	Class A without additional components Class B with additional components
Radiated	BS EN/EN55032	Class B without additional components

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

OTHERS

MTBF (Typ.): 2500Khrs MIL-HDBK-217F(25℃)
DIMENSION (L*W*H): 31.8*20.3*10.2mm (1.25*0.8*0.4 inch)
CASE MATERIAL: Non-Conductive black plastic (UL 94V-0 rated)
PACKING: 12.5g ; 10pcs/per tube, 600pcs/60 tube/per carton

Test conditions and notes5

1.All parameters are specified at normal input (48Vdc), 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 0% 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)

Technical drawings

SCWN03W8-03 DIMENSION (L*W*H) 31.8*20.3*10.2mm — DIMENSION (L*W*H) 31.8*20.3*10.2mm

SCWN03W8-03 Derating Curve — Derating Curve

SCWN03W8-03 Pin Assignment — Pin Assignment

Typical applications

Downloads

Datasheet1

SCWN03W8-03 datasheetSCWN03W8_DCWN03W8_Spec_Sheet.pdf · 2025-07-17 edition PDF Download

Catalogues2

Mean Well DC-DC Catalog PDF Download

Mean Well Catalog (Industrial) PDF Download

FAQ

What is the Mean Well SCWN03W8-03 designed for?

The SCWN03W8-03 is a 3W DC-DC converter module for applications that need a regulated 3.3V DC output from a much wider DC input range. It is suited to industrial and embedded power designs where compact size, isolation, and wide input tolerance are important.

What input voltage range does the SCWN03W8-03 support?

This model supports an ultra-wide 9 to 75V DC input range. That allows it to work across multiple nominal DC bus voltages including 12V, 24V, 36V, 48V, and 72V systems.

What output does the SCWN03W8-03 provide?

The SCWN03W8-03 provides a single 3.3V DC output. Its rated power is 3W, making it a compact option for low-power electronics and control applications.

Is the SCWN03W8-03 suitable for harsh temperature environments?

Yes, this converter is specified for operation from -40°C to +95°C, with load derating at higher temperatures per the derating curve. That wide operating range makes it appropriate for demanding environments where standard commercial-grade converters may not be suitable.

What protection and isolation features are included in the SCWN03W8-03?

This model includes protection for short circuit, overload, over voltage, and UVLO. It also provides 3KV DC input-to-output isolation, which is useful in designs that need electrical separation between input and output stages.

Payment & Security

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Model	Power	Voltage	Current	IP Rating
Mean Well SCWN03W8-15 DC-DC Converter - 3W 9~75V DC in 15V out 200mA	3W	15V	0 Milliampere	IP20	View
Mean Well SCWN03W8-12 DC-DC Converter - 3W 9~75V DC in 12V out 250mA	3W	12V	0 Milliampere	IP20	View
Mean Well SCWN03W8-05 DC-DC Converter - 3W 9~75V DC in 5V out 600mA	3W	5V	0 Milliampere	IP20	View
Mean Well SCWN03E-15 DC-DC Converter - 3W 4.5~9V DC in 15V out 200mA	3W	15V	0.2A	IP20	View
Mean Well SCWN03E-12 DC-DC Converter - 3W 4.5~9V DC in 12V out 250mA	3W	12V	0.25A	IP20	View
Mean Well SCWN03E-05 DC-DC Converter - 3W 4.5~9V DC in 5V out 600mA	3W	5V	0.6A	IP20	View
Mean Well SCWN03E-03 DC-DC Converter - 3W 4.5~9V DC in 3.3V out 909mA	3W	3.3V	0.9091A	IP20	View
Mean Well SCWN03C-15 DC-DC Converter - 3W 36~72V DC in 15V out 200mA	3W	15V	0.2A	IP20	View
Mean Well SCWN03C-12 DC-DC Converter - 3W 36~72V DC in 12V out 250mA	3W	12V	0.25A	IP20	View
Mean Well SCWN03C-05 DC-DC Converter - 3W 36~72V DC in 5V out 600mA	3W	5V	0.6A	IP20	View
Mean Well SCWN03C-03 DC-DC Converter - 3W 36~72V DC in 3.3V out 909mA	3W	3.3V	0.9091A	IP20	View
Mean Well SCWN03B-15 DC-DC Converter - 3W 18~36V DC in 15V out 200mA	3W	15V	0.2A	IP20	View
Mean Well SCWN03B-12 DC-DC Converter - 3W 18~36V DC in 12V out 250mA	3W	12V	0.25A	IP20	View
Mean Well SCWN03B-05 DC-DC Converter - 3W 18~36V DC in 5V out 600mA	3W	5V	0.6A	IP20	View
Mean Well SCWN03B-03 DC-DC Converter - 3W 18~36V DC in 3.3V out 909mA	3W	3.3V	0.9091A	IP20	View
Mean Well SCWN03A-15 DC-DC Converter - 3W 9~18V DC in 15V out 200mA	3W	15V	0.2A	IP20	View
Mean Well SCWN03A-12 DC-DC Converter - 3W 9~18V DC in 12V out 250mA	3W	12V	0.25A	IP20	View
Mean Well SCWN03A-05 DC-DC Converter - 3W 9~18V DC in 5V out 600mA	3W	5V	0.6A	IP20	View

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