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Mean Well MDS20B-12 DC-DC Converter - 20W - 18~36V in 12V out 1.67A

SKU MDS20B-12

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Overview

MDS20B-12 is the 12V output model of this series: rated power 20W, typical efficiency 88%.

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

MDS20B-12Specifications from the official datasheet (2024-04-30 edition)

INPUT

INPUT VOLTAGE (RANGE): Normal 24V (18 ~ 36V)
INPUT CURRENT NO LOAD: 7mA
INPUT CURRENT FULL LOAD: 1000mA
VOLTAGE RANGE: 18~36Vdc
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.): 88%
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

MDS20B-12 Pin Configuration — Pin Configuration

MDS20B-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 MDS20B-12 for 12V automation controls on an 18-36V input supply?

Yes, this converter is built for 12V constant voltage output from an 18-36V input range. Its 20W rating and 1.67A output make it suitable for 12V control electronics, automation modules, and industrial devices that stay within that load.

Is this a good fit for 12V instrumentation or panel devices in industrial equipment?

It can be used where the equipment needs a regulated 12V output and the source falls within 18-36V. The available output is up to 1.67A with 20W total power, which is appropriate for lower-power instrumentation and panel electronics.

Can the MDS20B-12 support 12V embedded or communications hardware inside a control cabinet?

It is appropriate for embedded or communications hardware that requires 12V constant voltage and does not exceed 1.67A. The compact 50.8 × 25.4 × 12.0 mm package is also useful in space-constrained control enclosures.

What is the difference between the MDS20B-12 and the other MDS20B models?

The MDS20B series versions listed here all share a 20W rating and 18-36V input range, but each has a different output. The available outputs are 5V at 4A, 12V at 1.67A, 15V at 1.33A, and 24V at 833mA.

Can the MDS20B-12 be used in cold or hot industrial environments?

The specified operating temperature range is -40°C to +90°C, with output derating at higher ambient temperatures per the datasheet derating curve. No IP rating is provided, so the specs do not identify it as sealed for direct outdoor exposure or washdown areas.

Payment & Security

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