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Mean Well SCW20B-05 DC-DC Converter - 20W 18~36V DC in 5V out 4A

Name: Mean Well SCW20B-05 DC-DC Converter - 20W 18~36V DC in 5V out 4A
Brand: Mean Well
SKU: SCW20B-05
Price: 26.45 USD
Availability: InStock

SKU SCW20B-05

$26.45 USD

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Overview

SCW20B-05 is the 5V output model of this series: rated power 20W, typical efficiency 86%.

SCW20 series is 20W isolated and regulated module type DC-DC converter with DIP24 package. It features international standard pins, a high efficiency up to 89%, wide working temperature range -40~+80℃, 1.5KVDC I/P-O/P isolation voltage, Compliance to BS EN/EN55032 radiated Class A with additional components, continuous-mode short circuit protection, etc. The additional components, models account for different input voltage 9~18V, 18~36V and 36~75V 2:1 wide input range, 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

DIP24 package with industry standard pinout
2:1 wide input range
Operating temperature range -40 ~ +80℃
No minimum load required
Comply to BS EN/EN55032 radiated Class A with additional components
High efficiency up to 89%
Protections: Short circuit (Continuous) / Overload
1.5KVDC I/O isolation
Remote ON/OFF control
3 years warranty

Specifications

SCW20B-05Specifications from the official datasheet (2025-07-28 edition)

MODEL SELECTION TABLE

INPUT VOLTAGE (RANGE): Normal 24V (18 ~ 36V)
INPUT CURRENT NO LOAD: 60mA
INPUT CURRENT FULL LOAD: 969mA
OUTPUT VOLTAGE: 5V
OUTPUT CURRENT: 4000mA
EFFICIENCY (TYP.): 86%
CAPACITOR LOAD (MAX.): 1000μF

INPUT

VOLTAGE RANGE: 18~36Vdc ,
FILTER: Pi type
PROTECTION: Fuse recommended. 12Vin models: 4A Slow-Blow Type, 24Vin models: 2A Slow-Blow Type, 48Vin models: 1A Slow-Blow Type
INTERNAL POWER DISSIPATION: 500mW

OUTPUT

VOLTAGE ACCURACY: ±2%
RATED POWER: 20W
RIPPLE & NOISE^Note.2: 80mVp-p
LINE REGULATION^Note.3: ±0.5%
LOAD REGULATION^Note.4: ±0.5%
SWITCHING FREQUENCY (Min.): 400KHz

PROTECTION

SHORT CIRCUIT: Protection type : Continuous, automatic recovery
OVERLOAD: 120 ~ 190% rated output power Protection type : Recovers automatically after fault condition is removed

FUNCTION

REMOTE CONTROL: Power ON: R.C. ~ -Vin > 2.5VDC or open ; Power OFF: R.C. ~ -Vin < 0.8VDC or short

ENVIRONMENT

COOLING: Free-air convection
WORKING TEMP.: -40 ~ +80℃ (Refer to "Derating Curve")
CASE TEMPERATURE: +110℃ 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 (EAC TP TC 004 for 48Vin type only) approved
WITHSTAND VOLTAGE: I/P-O/P:1.5KVDC
ISOLATION RESISTANCE: I/P-O/P:100M Ohms / 500VDC / 25℃/ 70% RH
ISOLATION CAPACITANCE (Typ.): 1200pF
EMC EMISSION: Parameter Standard Test Level

Conducted BS EN/EN55032(CISPR32) N/A
Radiated BS EN/EN55032(CISPR32) Class A with 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 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 with 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 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: 224Khrs MIL-HDBK-217F(25℃)
DIMENSION (L*W*H): 31.8*20.3*12.2mm (1.25*0.8*0.48 inch)
CASE MATERIAL: Five-sided shield metal case
PACKING: 18.5g ; 15pcs/per tube, 750pcs/50 tube/per carton

Test conditions and notes5

1.All parameters are specified at normal input(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 20% 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

SCW20B-05 Mechanical Specification — Mechanical Specification

SCW20B-05 Pin Assignment — Pin Assignment

SCW20B-05 S C W 2 0 series — S C W 2 0 series

SCW20B-05 S C W 2 0 series (2) — S C W 2 0 series (2)

Typical applications

Downloads

Certificates3

CE Certificate(SCW/DCW-1220)(EN) PDF Download

EMC Certificate(SCW/DCW-1220)(EN) PDF Download

EAC Certificate(EN) PDF Download

Catalogues2

Mean Well DC-DC Catalog PDF Download

Mean Well Catalog (Industrial) PDF Download

FAQ

Can I use the SCW20B-05 to power 5V embedded controllers from a 24V industrial DC bus?

Yes, this model accepts 18~36V DC input and provides a constant 5V output. With up to 4A output current and 20W total power, it fits many embedded controllers, single-board systems, and logic devices that need 5V from a nominal 24V DC source.

Is the SCW20B-05 suitable for supplying 5V power in PLC or automation cabinets?

It is suitable when the cabinet has an 18~36V DC source and the load requires regulated 5V DC. The 4A output capacity is useful for control electronics, communication modules, and other 5V devices within the 20W limit.

Can this converter support 5V industrial IT or networking hardware in a 24V system?

It can be used for 5V hardware as long as the source stays within 18~36V DC and the total load remains at or below 4A and 20W. That makes it relevant for compact industrial IT, communications, and monitoring devices that operate on 5V DC.

Is the SCW20B-05 a good fit for compact battery or vehicle-based control equipment with a 24V DC supply?

It can be a fit where the available DC source is in the 18~36V range and the electronics need a stable 5V rail. The small 31.8 × 20.3 × 12.2 mm size and 0.0185 kg weight make it easier to use in compact equipment.

How does the SCW20B-05 compare with the other SCW20B models?

The SCW20B-05 provides 5V at 4A, while the SCW20B-12 provides 12V at 1.67A and the SCW20B-15 provides 15V at 1.33A. All three models are rated at 20W and use the same 18~36V DC input range.

Is the SCW20B-05 intended for outdoor or wide-temperature use?

The operating temperature range is -40°C to +80°C, with output load derated at higher temperatures per the derating curve. No IP rating is listed in the provided specs, so the data does not confirm suitability for direct outdoor exposure.

Payment & Security

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Model	Power	Voltage	Current	IP Rating
Mean Well SCW20W8-24 DC-DC Converter - 20W 9~75V DC in 24V out 833mA	20W	24V	0 Milliampere	IP20	View
Mean Well SCW20W8-15 DC-DC Converter - 20W 9~75V DC in 15V out 1.33A	20W	15V	0 Milliampere	IP20	View
Mean Well SCW20W8-12 DC-DC Converter - 20W 9~75V DC in 12V out 1.67A	20W	12V	0 Milliampere	IP20	View
Mean Well SCW20W8-05 DC-DC Converter - 20W 9~75V DC in 5V out 4A	20W	5V	0 Milliampere	IP20	View
Mean Well SCW20W8-03 DC-DC Converter - 20W 9~75V DC in 3.3V out 6.06A	20W	3.3V	0 Milliampere	IP20	View

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