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Mean Well SCWN03B-12 DC-DC Converter - 3W 18~36V DC in 12V out 250mA

SKU SCWN03B-12

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Overview

SCWN03B-12 is the 12V output model of this series: rated power 3W, typical efficiency 86%.

SCWN03 and DCWN03 series are 3W isolated and regulated module type DC-DC converter with DIP24 package. It features international standard pins, a high efficiency up to 87%, wide working temperature range -40~+ 90℃, 3 KVDC I/P-O/P isolation voltage, Compliance to BS EN/EN55032 radiated Class A without additional components, continuous-mode short circuit protection, etc. The additional components, models account for different input voltage 4.5~9V, 9~18V, 18~36V and 36~72V 2:1 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, s uch as industrial control, telecommunication field, distributed power architecture, and so on.

Features

DIP24 package with industry standard pinout
2:1 wide input range
Operating temperature range -40 ~ +90℃
No minimum load required
Comply to BS EN/EN55032 radiated Class A without additional components
High efficiency up to 87%
Protections: Short circuit (Continuous) / Overload / Input under voltage
3KVDC I/O isolation
3 years warranty

Specifications

SCWN03B-12Specifications from the official datasheet (2024-04-30 edition)

MODEL SELECTION TABLE

INPUT VOLTAGE (RANGE): 24V (18 ~ 36V)
INPUT CURRENT NO LOAD: 7.5mA
INPUT CURRENT FULL LOAD: 145mA
OUTPUT VOLTAGE: 12V
OUTPUT CURRENT: 250mA
EFFICIENCY (TYP.): 86%
CAPACITOR LOAD (MAX.)^{* For each output}: 2200μF

INPUT

VOLTAGE RANGE: 18~36Vdc ,
SURGE VOLTAGE (100ms max.): 5Vin models : 10Vdc ; 12Vin models : 25Vdc ; 24Vin models : 50Vdc ; 48Vin models : 100Vdc
FILTER: Pi type
PROTECTION: Fuse recommended. 5Vin models: 1.5A Fast-Acting Type, 12Vin models: 0.8A Fast-Acting Type, 24Vin models: 0.5A Fast-Acting Type, 48Vin models: 250mA Fast-Acting Type
INTERNAL POWER DISSIPATION: 500mW

OUTPUT

VOLTAGE ACCURACY: ±1.5%
RATED POWER: 3W
RIPPLE & NOISE^Note.2: 50mVp-p
LINE REGULATION^Note.3: ±0.5%
LOAD REGULATION^Note.4: Single output models:±0.5%, Dual output models:±1%
SWITCHING FREQUENCY (Min.): 100KHz

PROTECTION

SHORT CIRCUIT: Protection type : Continuous, automatic recovery
OVERLOAD: 120 ~ 250% rated output power Protection type : Recovers automatically after fault condition is removed
UNDER VOLTAGE LOCKOUT Start-up voltage: 5Vin: 4.4Vdc, 12Vin: 8.8Vdc, 24Vin: 17Vdc, 48Vin: 34Vdc
UNDER VOLTAGE LOCKOUT Shutdown voltage: 5Vin: 4.2Vdc, 12Vin: 8Vdc, 24Vin: 16Vdc, 48Vin: 31Vdc

ENVIRONMENT

COOLING: Free-air convection
WORKING TEMP.: -40 ~ +90℃ (Refer to "Derating Curve")
CASE TEMPERATURE: +100℃ max.
WORKING HUMIDITY: 20% ~ 90% RH non-condensing
STORAGE TEMP., HUMIDITY: -40 ~ +105℃, 10 ~ 95% RH non-condensing
TEMP. COEFFICIENT: 0.03% / ℃ (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:100M Ohms / 500VDC / 25℃/ 70% RH
ISOLATION CAPACITANCE (Typ.): 250pF
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 2, ±8KV air, ±4KV contact
Radiated Susceptibility BS EN/EN61000-4-3 Level 2, 3V/m
EFT/Bursts BS EN/EN61000-4-4 Level 1, 0.5KV
Surge BS EN/EN61000-4-5 Level 1, 0.5KV Line-Line
Conducted BS EN/EN61000-4-6 Level 2, 3V(e.m.f.)
Magnetic Field BS EN/EN61000-4-8 Level 2, 3A/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 2, ±8KV air, ±4KV contact
Radiated Susceptibility	BS EN/EN61000-4-3	Level 2, 3V/m
EFT/Bursts	BS EN/EN61000-4-4	Level 1, 0.5KV
Surge	BS EN/EN61000-4-5	Level 1, 0.5KV Line-Line
Conducted	BS EN/EN61000-4-6	Level 2, 3V(e.m.f.)
Magnetic Field	BS EN/EN61000-4-8	Level 2, 3A/m

OTHERS

MTBF: 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: 12.3g ; 10pcs/per tube, 600pcs/60 tube/per carton

Test conditions and notes5

1.All parameters are specified at normal input(E:5Vdc, A:12Vdc, B:24Vdc, C: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 10% to 100% rated load for SCWN03, 25% to 100% rated load for DCWN03.
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

SCWN03B-12 Plug Assignment — Plug Assignment

Typical applications

Downloads

Certificates1

CE Certificate(SCWN/DCWN-03)(EN) PDF Download

Catalogues2

Mean Well DC-DC Catalog PDF Download

Mean Well Catalog (Industrial) PDF Download

FAQ

Can I use the SCWN03B-12 for 12V sensors or control modules in automation equipment?

Yes, if the 12V load stays within 0.25A and the total power stays within 3W. This model provides constant-voltage 12V output and is specified for an 18-36VDC input range.

Is the SCWN03B-12 suitable for compact 12V embedded or industrial interface boards?

It is suitable for compact 12V electronics that need regulated constant voltage at up to 0.25A. The housing size is 31.8 × 20.3 × 10.2 mm, which supports tight-space equipment designs.

Can this converter support a 12V alarm, signaling, or relay control circuit?

It can support 12V signaling or relay-related electronics when the demand remains within 0.25A and 3W. The input side must also match the specified 18-36VDC range.

What is the difference between the SCWN03B-12 and the other SCWN03B models?

The SCWN03B-12 is the 12V version and is rated at 0.25A and 3W. Other models in the series are SCWN03B-03 at 3.3V and 0.6A, SCWN03B-05 at 5V and 0.6A, and SCWN03B-15 at 15V and 0.2A; all are 3W converters.

Is the SCWN03B-12 intended for outdoor use or only controlled environments?

The temperature specification is -40°C to +90°C, which covers a wide operating range. An IP rating is not listed in the provided specs, so weather exposure or sealed outdoor use is not specified.

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