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Mean Well SKMW20G-03 DC-DC Converter - 20W - 18~75V in 3.3V out 4.5A

SKU SKMW20G-03

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Overview

SKMW20G-03 is the 3.3V output model of this series: rated power 20W, typical efficiency 87%.

SKMW20 and DKMW20 series are 20W isolated and regulated module type DC-DC converter with DIP 1"x1" package. It features international standard pins, a high efficiency up to 89%, wide working temperature range -40~+85℃, 1.5KVDC I/P-O/P isolation voltage, compliance to BS EN/EN55032 radiated Class A without additional components, continuous-mode short circuit, overload, over temperature, input under voltage protection, remote ON/OFF and trimmable output voltage etc. The models account for different input voltage 9~36V and 18~75V 4:1 ultrawide input range, and various output voltage, 3.3V /5V/12V/15V for single output and ±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

DIP 1"x1" package with industry standard pinout
4:1 ultrawide input range
Operating temperature range -40 ~ +85℃
No minimum load required
Comply to BS EN/EN55032 radiated Class A without additional components
High efficiency up to 89%
Protections: Short circuit (Continuous) / Overload / Over voltage / Input under voltage
1.5KVDC I/O isolation
Remote ON/OFF control and Triming output (±10%)
3 years warranty

Specifications

SKMW20G-03Specifications from the official datasheet (2024-04-30 edition)

INPUT

INPUT VOLTAGE (RANGE): 48V (18 ~ 75V)
INPUT CURRENT NO LOAD: 8mA
INPUT CURRENT FULL LOAD: 390mA
VOLTAGE RANGE: 18~75Vdc
SURGE VOLTAGE (100ms max.): 24Vin models : 50Vdc, 48Vin models : 100Vdc
FILTER: Pi type
PROTECTION: Fuse recommended. 24Vin models: 3A delay time Type, 48Vin models: 1.5A delay time Type
INTERNAL POWER DISSIPATION: 500mW

OUTPUT

OUTPUT VOLTAGE: 3.3V
OUTPUT CURRENT: 0~4500mA
EFFICIENCY (TYP.): 87%
CAPACITOR LOAD (MAX.)^{* For each output}: 5000μF
VOLTAGE ACCURACY: ±1.5%
RATED POWER: 20W
RIPPLE & NOISE^Note.2: 3.3/5Vout models: 75mVp-p, other models:100mVp-p
LINE REGULATION^Note.3: ±0.2%
LOAD REGULATION^Note.4: Single output models: ±0.2%, Dual output models:±1%
SWITCHING FREQUENCY (Typ.): 3.3/5Vout models: 270KHz, other models: 330KHz
EXTERNAL TRIM ADJ. RANGE (Typ.): ±10% (Single output model only)

PROTECTION

SHORT CIRCUIT: Protection type : Continuous, automatic recovery
OVERLOAD: 110 ~ 170% rated output power Protection type : Recovers automatically after fault condition is removed
OVER VOLTAGE: Protection type : Clamp by diode
UNDER VOLTAGE LOCKOUT Start-up voltage: 24Vin (F-type): 8.8Vdc, 48Vin (G-type): 17Vdc
UNDER VOLTAGE LOCKOUT Shutdown voltage: 24Vin (F-type): 8Vdc, 48Vin (G-type): 16Vdc

FUNCTION

REMOTE CONTROL: Power ON: R.C. ~ -Vin >3.5~75Vdc or open circuit ; Power OFF: R.C. ~ -Vin <1.2Vdc or short

ENVIRONMENT

COOLING: Free-air convection
WORKING TEMP.: -40 ~ +85℃ (Refer to "Derating Curve")
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 ~ 60℃)
SOLDERING TEMPERATURE: 1.5mm from case of 1 ~ 5 sec./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.): 1500pF
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: 3.3/5Vout models: 910Khrs, Other models: 1220Khrs MIL-HDBK-217F(25℃)
DIMENSION (L*W*H): 25.4*25.4*10.2mm (1*1*0.4 inch)
CASE MATERIAL: Black coated copper with non-conductive base
PACKING: 19g ; 12pcs/per tube, 600pcs/50 tube/per carton

Test conditions and notes5

1.All parameters are specified at normal input(F:24Vdc, G: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

SKMW20G-03 SKMW20 & DKMW20 series — SKMW20 & DKMW20 series

SKMW20G-03 SKMW20 & DKMW20 series (2) — SKMW20 & DKMW20 series (2)

SKMW20G-03 Plug Assignment — Plug Assignment

Typical applications

Downloads

Certificates2

Certificate (SKMW20-DKMW20-CE-dec)(EN) PDF Download

Certificate (SKMW-DKMW20-UK-dec)(EN) PDF Download

Test reports1

Test Report (SKMW20G-03)(EN) PDF Download

Catalogues2

Mean Well DC-DC Catalog PDF Download

Mean Well Catalog (Industrial) PDF Download

FAQ

Can I use the SKMW20G-03 to power 3.3V embedded processors or industrial communication boards from a higher-voltage source?

Yes, this model provides constant-voltage 3.3V output for loads up to 4.5A. Its input range is 18-75V, with a total power rating of 20W.

Is the SKMW20G-03 suitable for 3.3V automation electronics on a 24V, 48V, or similar bus within the listed range?

It is intended for applications that need 3.3V output from any source within the specified 18-75V input range. The converter can supply up to 4.5A at 3.3V in constant-voltage mode.

Can this model be used for compact industrial or embedded designs where board space matters?

Yes, the module is compact at 25.4 × 25.4 × 10.2 mm and weighs 19g. That makes it easier to use where a small 20W converter is needed for 3.3V loads.

Is the SKMW20G-03 rated for outdoor temperature swings or only indoor use?

The product is rated for operation from -40°C to +85°C, so the temperature specification is broad. No IP rating is provided in the specs, so the product page does not define weather or ingress protection.

How does the SKMW20G-03 compare with other SKMW20G models?

All SKMW20G siblings in this set are 20W converters. The other output options are 5V at 4A, 12V at 1.67A, and 15V at 1.33A, while this version provides 3.3V at 4.5A.

Payment & Security

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Model	Power	Voltage	Current	IP Rating
Mean Well SKMW20W8-15 20W DC-DC Converter 15VDC 1.33A	20W	15V	1.33A	IP20	View
Mean Well SKMW20W8-12 20W DC-DC Converter 12VDC 1.67A	20W	12V	1.67A	IP20	View
Mean Well SKMW20W8-05 20W DC-DC Converter 5VDC 4A	20W	5V	4A	IP20	View
Mean Well SKMW20W8-03 20W DC-DC Converter 3.3VDC 6.06A	20W	3.3V	6.06A	IP20	View
Mean Well SKMW20G-15 DC-DC Converter - 20W - 18~75V in 15V out 1.33A	20W	15V	1.33A	IP20	View
Mean Well SKMW20G-12 DC-DC Converter - 20W - 18~75V in 12V out 1.67A	20W	12V	1.67A	IP20	View
Mean Well SKMW20G-05 DC-DC Converter - 20W - 18~75V in 5V out 4A	20W	5V	4A	IP20	View
Mean Well SKMW20F-15 DC-DC Converter - 20W - 9~36V in 15V out 1.33A	20W	15V	1.33A	IP20	View
Mean Well SKMW20F-12 DC-DC Converter - 20W - 9~36V in 12V out 1.67A	20W	12V	1.67A	IP20	View
Mean Well SKMW20F-05 DC-DC Converter - 20W - 9~36V in 5V out 4A	20W	5V	4A	IP20	View
Mean Well SKMW20F-03 DC-DC Converter - 20W - 9~36V in 3.3V out 4.5A	20W	3.3V	4.5A	IP20	View

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