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Mean Well MDS20A-12 DC-DC Converter - 20W - 9~18V in 12V out 1.67A

SKU MDS20A-12

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Overview

MDS20A-12 is the 12V output model of this series: rated power 20W, typical efficiency 89%.

MDS20 series is 20W isolated and regulated module type medical grade DC-DC converter with 2"x1" package. It features international standard pins, a high efficiency up to 90%, wide working temperature range -40~+90℃, 4KVAC I/P-O/P high isolation voltage, compliance with IEC60601-1 medical standard, continuous-mode short circuit protection, etc. The 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/24V, which are suitable for medical systems, ultra low leakage current.

Features

DIP 2"x1" package with international standard pinout
2:1 wide input range
Low patient leakage current <5μA
Wide operating temperature range -40 ~ +90℃
Medical safety approved (2xMOPP) according to IEC60601-1
No minimum load required
Protections: Short circuit (Continuous) / Overload / Input under voltage
4000VAC high I/O isolation (Reinforced isolation)
3 years warranty

Specifications

MDS20A-12Specifications from the official datasheet (2024-04-30 edition)

INPUT

INPUT VOLTAGE (RANGE): Normal 12V (9 ~ 18V)
INPUT CURRENT NO LOAD: 10mA
INPUT CURRENT FULL LOAD: 1950mA
VOLTAGE RANGE: 9~18Vdc
SURGE VOLTAGE (100ms max.): 12Vin models : 25Vdc, 24Vin models : 50Vdc, 48Vin models : 100Vdc
FILTER: Pi type
PROTECTION: Fuse recommended. 12Vin models: 5A delay time Type, 24Vin models: 3A delay time Type, 48Vin models: 2A delay time Type

OUTPUT

OUTPUT VOLTAGE: 12V
OUTPUT CURRENT: 1670mA
EFFICIENCY (Typ.): 89%
CAPACITOR LOAD (MAX.): 1200μF
VOLTAGE ACCURACY: ±1%
RATED POWER: 20W
RIPPLE & NOISE^Note.2: 60mVp-p
LINE REGULATION^Note.3: ±0.5%
LOAD REGULATION^Note.4: ±0.5%
SWITCHING FREQUENCY (Typ.): 12Vin/24Vin:250KHz, 48Vin:300KHz

PROTECTION

SHORT CIRCUIT: Protection type : Continuous, automatic recovery
OVERLOAD: 110 ~ 180% rated output power Protection type : Recovers automatically after fault condition is removed
UNDER VOLTAGE LOCKOUT: 12Vin: 7.5Vdc, 24Vin: 15Vdc, 48Vin: 33Vdc

ENVIRONMENT

COOLING: Free-air convection
WORKING TEMP.: -40 ~ +90℃ (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 ~ 70℃)
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.6)

SAFETY STANDARDS: IEC60601-1(LVD) 3rd edition, EAC TP TC 020/2011(EAC TP TC 004 for 48Vin type only) approved
WITHSTAND VOLTAGE: I/P-O/P 4KVAC
ISOLATION RESISTANCE: I/P-O/P:100M Ohms / 500VDC / 25℃/ 70% RH
ISOLATION CAPACITANCE (Typ.): 100pF
EMC EMISSION: Parameter Standard Test Level

Conducted BS EN/EN55011 Class A without external components
Radiated BS EN/EN55011 Class A without external components
EMC IMMUNITY: Parameter Standard Test Level

ESD BS EN/EN61000-4-2 Level 1, ±15KV air, ±8KV contact
Radiated Susceptibility BS EN/EN61000-4-3 Level 1, 10V/m
EFT/Bursts BS EN/EN61000-4-4 Level 1, ±2KV
Surge BS EN/EN61000-4-5 Level 1, ±1KV Line-Line, ±2KV Line-GND
Conducted BS EN/EN61000-4-6 Level 1, 10Vrms(e.m.f.)

Parameter	Standard	Test Level
Conducted	BS EN/EN55011	Class A without external components
Radiated	BS EN/EN55011	Class A without external components

Parameter	Standard	Test Level
ESD	BS EN/EN61000-4-2	Level 1, ±15KV air, ±8KV contact
Radiated Susceptibility	BS EN/EN61000-4-3	Level 1, 10V/m
EFT/Bursts	BS EN/EN61000-4-4	Level 1, ±2KV
Surge	BS EN/EN61000-4-5	Level 1, ±1KV Line-Line, ±2KV Line-GND
Conducted	BS EN/EN61000-4-6	Level 1, 10Vrms(e.m.f.)

OTHERS

MTBF: 1016Khrs MIL-HDBK-217F(25℃)
DIMENSION (L*W*H): 50.8*25.4*12mm (2*1*0.47 inch)
CASE MATERIAL: UL94V-0 plastic case
PACKING: 30g; 18pcs/per tube, 432pcs/24 tube max./carton

Test conditions and notes6

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 0% to 100% rated load.
5.2xMOPP base on a working voltage of 250Vac between Primary to Secondary.
6.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

MDS20A-12 Pin Configuration — Pin Configuration

MDS20A-12 Derating Curve — Derating Curve

Typical applications

Medical devices
Medical oxygen monitor
CT scanning
Medical carts
Oral care equipment

Downloads

Certificates3

Certificate (MDS15-20-EMC)(EN) PDF Download

Certificate (MDS15-20-CE-dec)(EN) PDF Download

Certificate (MDS15-20-UK-dec)(EN) PDF Download

Catalogues2

Mean Well DC-DC Catalog PDF Download

Mean Well Catalog (Industrial) PDF Download

FAQ

Can I use the MDS20A-12 to power 12V automation sensors or control accessories from a 12V-class DC source?

Yes, it provides a constant 12V output from a 9-18V input range. With a 20W rating and 1.67A output current, it is suited to lower-power 12V automation, sensing, and control loads that fit within that output envelope. It is intended for regulated 12V distribution, not variable-output use.

Is the MDS20A-12 suitable for 12V embedded or industrial communication hardware?

It can fit 12V embedded electronics and industrial interface devices that need a stable 12V rail and are sized within 20W. The converter operates in constant-voltage mode and accepts 9-18V input. Its compact 50.8 × 25.4 × 12.0 mm form factor also helps in dense equipment layouts.

Can this model be used where the input voltage varies across a wide 12V-system range?

Yes, the specified input range is 9-18V, which covers a broad span around nominal 12V-class systems. The output stays at 12V in constant-voltage mode. That makes it a practical choice for low-power 12V subcircuits that need regulation rather than direct bus connection.

How does the MDS20A-12 compare with the MDS20A-05, -15, and -24?

All four models are rated at 20W, but they differ by output voltage and rated current. The MDS20A-05 is 5V at 4A, the MDS20A-12 is 12V at 1.67A, the MDS20A-15 is 15V at 1.33A, and the MDS20A-24 is 24V at 833mA. The -12 version is the 12V member of the family.

Is the MDS20A-12 designed for outdoor installations?

The unit has a wide operating temperature range of -40°C to +90°C, with output derating at higher ambient temperatures per the datasheet derating curve. However, no IP rating is listed in the provided specs, so it should generally be used inside protected equipment, enclosed panels, or indoor housings rather than in exposed outdoor locations. Outdoor suitability depends on enclosure protection as well as temperature.

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Model	Power	Voltage	Current	IP Rating
Mean Well MDS20C-24 DC-DC Converter - 20W - 36~75V in 24V out 833mA	20W	24V	833 Milliampere	IP20	View
Mean Well MDS20C-15 DC-DC Converter - 20W - 36~75V in 15V out 1.33A	20W	15V	1.33A	IP20	View
Mean Well MDS20C-12 DC-DC Converter - 20W - 36~75V in 12V out 1.67A	20W	12V	1.67A	IP20	View
Mean Well MDS20C-05 DC-DC Converter - 20W - 36~75V in 5V out 4A	20W	5V	4A	IP20	View
Mean Well MDS20B-24 DC-DC Converter - 20W - 18~36V in 24V out 833mA	20W	24V	833 Milliampere	IP20	View
Mean Well MDS20B-15 DC-DC Converter - 20W - 18~36V in 15V out 1.33A	20W	15V	1.33A	IP20	View
Mean Well MDS20B-12 DC-DC Converter - 20W - 18~36V in 12V out 1.67A	20W	12V	1.67A	IP20	View
Mean Well MDS20B-05 DC-DC Converter - 20W - 18~36V in 5V out 4A	20W	5V	4A	IP20	View
Mean Well MDS20A-24 DC-DC Converter - 20W - 9~18V in 24V out 833mA	20W	24V	833 Milliampere	IP20	View
Mean Well MDS20A-15 DC-DC Converter - 20W - 9~18V in 15V out 1.33A	20W	15V	1.33A	IP20	View
Mean Well MDS20A-05 DC-DC Converter - 20W - 9~18V in 5V out 4A	20W	5V	4A	IP20	View

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