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Mean Well SCW20B-12 DC-DC Converter - 20W 18~36V DC in 12V out 1.666A

SKU SCW20B-12

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Overview

SCW20B-12 is the 12V output model of this series: rated power 20W, typical efficiency 87%.

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-12Specifications from the official datasheet (2025-07-28 edition)

MODEL SELECTION TABLE

INPUT VOLTAGE (RANGE): Normal 24V (18 ~ 36V)
INPUT CURRENT NO LOAD: 25mA
INPUT CURRENT FULL LOAD: 957mA
OUTPUT VOLTAGE: 12V
OUTPUT CURRENT: 1666mA
EFFICIENCY (TYP.): 87%
CAPACITOR LOAD (MAX.): 220μF

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-12 Mechanical Specification — Mechanical Specification

SCW20B-12 Pin Assignment — Pin Assignment

SCW20B-12 S C W 2 0 series — S C W 2 0 series

SCW20B-12 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-12 to run 12V industrial control devices from a 24V DC system?

Yes, it is designed for an 18~36V DC input and provides a regulated 12V constant-voltage output. It can deliver up to 1.67A with a 20W limit, which suits many lower-power control and automation devices that need 12V DC.

Is the SCW20B-12 suitable for 12V embedded electronics in industrial equipment?

It is appropriate for embedded systems that need a stable 12V rail from an 18~36V DC source. The converter supports up to 1.67A output current, so it is best matched to moderate 12V loads within the 20W rating.

Can this converter be used in transportation or mobile automation equipment with a nominal 24V DC supply?

It can be used where the available input remains within 18~36V DC and the electronics require 12V DC. Its compact 31.8 × 20.3 × 12.2 mm package and 0.0185 kg weight help in space-limited mobile or distributed equipment.

Would the SCW20B-12 work for instrumentation or monitoring devices that need regulated 12V power?

Yes, it can fit instrumentation, monitoring, and control loads that operate from 12V and stay within 1.67A. The constant-voltage output is intended for equipment that needs a stable 12V supply from an 18~36V DC source.

What are the differences between the SCW20B-12 and its SCW20B siblings?

Within the SCW20B series, the 05 version provides 5V at 4A, the 12 version provides 12V at 1.67A, and the 15 version provides 15V at 1.33A. All are 20W converters with the same 18~36V DC input range.

Can the SCW20B-12 be used in cold or high-heat installations?

The specified operating temperature range is -40°C to +80°C, with the load derated at higher temperatures according to the derating curve. No IP rating is included in the listed specs, so the product data does not verify direct outdoor or water-exposed use.

Payment & Security

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Model	Power	Voltage	Current	IP Rating
Mean Well SCW20C-15 DC-DC Converter - 20W 36~75V DC in 15V out 1.333A	20W	15V	1.333A	IP20	View
Mean Well SCW20C-12 DC-DC Converter - 20W 36~75V DC in 12V out 1.666A	20W	12V	1.666A	IP20	View
Mean Well SCW20C-05 DC-DC Converter - 20W 36~75V DC in 5V out 4A	20W	5V	4A	IP20	View
Mean Well SCW20B-15 DC-DC Converter - 20W 18~36V DC in 15V out 1.333A	20W	15V	1.333A	IP20	View
Mean Well SCW20B-05 DC-DC Converter - 20W 18~36V DC in 5V out 4A	20W	5V	4A	IP20	View
Mean Well SCW20A-15 DC-DC Converter - 20W 9~18V DC in 15V out 1.333A	20W	15V	1.333A	IP20	View
Mean Well SCW20A-12 DC-DC Converter - 20W 9~18V DC in 12V out 1.666A	20W	12V	1.666A	IP20	View
Mean Well SCW20A-05 DC-DC Converter - 20W 9~18V DC in 5V out 4A	20W	5V	4A	IP20	View

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