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Mean Well MDD03G-12 Medical Grade DC/DC Converter 3W - 18-75V input, 12 and -12V output 250mA

12V3WDC/DCMedical Grade

SKU MDD03G-12

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Overview

MDD03G-12 is the ±12V output model of this series: rated power 3W, typical efficiency 80%.

MDS03 and MDD03 series are 3W isolated and regulated module type medical grade DC-DC converter with DIP 24 package. It features international standard pins, a high efficiency up to 81%, wide working temperature range -40~+90℃, 6KVDC or 4.2KVAC 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 9~36V and 18~75V 4:1 wide input range, and various output voltage, 5V/12V/15V for single output and ±5V/±12V/±15V for dual output. Which are suitable for medical systems, ultra low leakage current.

Features

DIP 24 package with international standard pinout
4:1 wide input range
Low patient leakage current <5μA
Wide operating temperature range -40 ~ +90℃
Medical safety approved (2xMOPP) according to IEC60601-1
Protections: Short circuit (Continuous) / Overload / UVLO
6KVDC or 4.2KVAC high I/O isolation (Reinforced isolation)
3 years warranty

Specifications

MDD03G-12Specifications from the official datasheet (2025-07-28 edition)

INPUT

INPUT VOLTAGE (RANGE): Normal 24V,48V (18 ~ 75V)
INPUT CURRENT NO LOAD: 15mA
INPUT CURRENT FULL LOAD: 158mA
VOLTAGE RANGE: 18 ~ 75Vdc
SURGE VOLTAGE (100ms max.): F models : 50Vdc ; G models : 100Vdc
FILTER: Pi type
PROTECTION (Typ.): Fuse recommended. F models: 2A slow-blow Type, G models: 1A slow-blow Type

OUTPUT

OUTPUT VOLTAGE: ±12V
OUTPUT CURRENT: ±12.5 ~ 125mA
EFFICIENCY (TYP.): 80%
CAPACITOR LOAD (MAX.)^{* For each output}: *47μF
VOLTAGE ACCURACY: ±2%
RATED POWER: 3W
RIPPLE & NOISE^Note.2: 150mVp-p
LINE REGULATION^Note.3: ±0.5%
LOAD REGULATION^Note.4: ±0.5%
SWITCHING FREQUENCY (Typ.): 250KHz

PROTECTION

SHORT CIRCUIT: Protection type : Continuous, automatic recovery
OVERLOAD: 110 ~ 250% rated output power Protection type : Recovers automatically after fault condition is removed
UNDER VOLTAGE LOCKOUT Start-up voltage: 8.8Vdc
UNDER VOLTAGE LOCKOUT Shutdown voltage: 8Vdc

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: 0.05% / ℃ (0 ~ 71℃)
SOLDERING TEMPERATURE: 1.5mm from case of 3 ~ 5sec./265℃ max.
VIBRATION: 10 ~ 500Hz, 2G 10min./1cycle, period for 60min. each along X, Y, Z axes

SAFETY & EMC ( Note.5)

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:6KVDC or 4.2KVAC
ISOLATION RESISTANCE: I/P-O/P:1000M Ohms / 500VDC / 25℃/ 70% RH
ISOLATION LEVEL: Primary-secondary: 2xMOPP when system input voltage is with 250VAC, 50/60Hz
ISOLATION CAPACITANCE (Typ.): 20pF
EMC EMISSION: Parameter Standard Test Level

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

ESD BS EN/EN61000-4-2 ±15KV air
Radiated Susceptibility BS EN/EN61000-4-3 10V/m
EFT/Bursts BS EN/EN61000-4-4 ±2KV
Surge BS EN/EN61000-4-5 ±2KV Line-Line
Conducted BS EN/EN61000-4-6 10Vrms(e.m.f.)
Magnetic Field BS EN/EN61000-4-8 30A/m

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

Parameter	Standard	Test Level
ESD	BS EN/EN61000-4-2	±15KV air
Radiated Susceptibility	BS EN/EN61000-4-3	10V/m
EFT/Bursts	BS EN/EN61000-4-4	±2KV
Surge	BS EN/EN61000-4-5	±2KV Line-Line
Conducted	BS EN/EN61000-4-6	10Vrms(e.m.f.)
Magnetic Field	BS EN/EN61000-4-8	30A/m

OTHERS

MTBF: >454Khrs MIL-HDBK-217F(25℃)
DIMENSION (L*W*H): 31.8*20.3*12.2mm (1.25*0.8*0.48 inch)
CASE MATERIAL: UL94V-0 plastic case
PACKING: 17g ; 15pcs/per tube, 750pcs/50 tube max./carton

Test conditions and notes5

1.All parameters are specified at normal input(F: 12Vdc, G: 24Vdc), 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 10% to 100% rated load for MDD03.
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

MDD03G-12 Mechanical Specification — Mechanical Specification

MDD03G-12 Plug Assignment — Plug Assignment

MDD03G-12 MDS03 & MDD03 series — MDS03 & MDD03 series

MDD03G-12 MDS03 & MDD03 series (2) — MDS03 & MDD03 series (2)

Typical applications

Downloads

Certificates2

Mean Well MDS(D)03-MDS(D)06-CE-dec Certificate PDF Download

Mean Well MDD-MDS03-06-UK-dec Certificate PDF Download

Test reports1

Mean Well MDD03G-12 Test Report PDF Download

FAQ

Can I use the MDD03G-12 for a 12V sensor, transmitter, or instrumentation rail inside industrial equipment?

This model is suited to low-power ±12V instrumentation or sensor circuits that need constant-voltage output and stay within 125mA per output. With 3W total output power, it is a fit for light control and monitoring loads rather than higher-draw 12V devices.

Is the MDD03G-12 a good fit for embedded control boards that need regulated 12V from a wide input range?

It can fit embedded control designs that need regulated ±12V rails and operate from the listed 18-75V input range. The converter provides ±12V at up to 125mA per output, so the connected 12V sections must remain within that output limit.

Can this converter be used in medical or laboratory electronics that require a small 12V DC/DC module?

Yes, it is positioned for medical-grade applications and is approved to IEC60601-1 3rd edition (2xMOPP) and EAC, which can be relevant in medical or lab equipment designs. Electrically, it is intended for low-power ±12V sections up to 125mA per output with 3W available output power.

How does the MDD03G-12 compare with the other 3W MDD03G versions?

The MDD03G-12 outputs ±12V at up to 125mA per output, while the MDD03G-05 outputs ±5V at 300mA and the MDD03G-15 outputs ±15V at 100mA. All three are 3W models with the same 18-75V input range, -40°C to +90°C operating temperature range, 31.8 × 20.3 × 12.2 mm size, and 0.017 kg weight.

Can the MDD03G-12 be used outdoors or in unsealed field enclosures?

Its stated operating range is -40°C to +90°C (with derating per the derating curve), which supports broad temperature conditions inside suitable equipment. However, no IP rating is provided, so the specs do not establish outdoor, weather-exposed, or unsealed enclosure suitability.

Payment & Security

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Model	Power	Voltage	Current	IP Rating
Mean Well MDD03G-15 Medical Grade DC/DC Converter 3W - 18-75V input, 15 and -15V output 200mA	3W	15V	0.2A	IP20	View
Mean Well MDD03G-05 Medical Grade DC/DC Converter 3W - 18-75V input, 5 and -5V output 600mA	3W	5V	0.6A	IP20	View
Mean Well MDD03F-15 Medical Grade DC/DC Converter 3W - 9-36V input, 15 and -15V output 200mA	3W	15V	0.2A	IP20	View
Mean Well MDD03F-12 Medical Grade DC/DC Converter 3W - 9-36V input, 12 and -12V output 250mA	3W	12V	0.25A	IP20	View
Mean Well MDD03F-05 Medical Grade DC/DC Converter 3W - 9-36V input, 5 and -5V output 600mA	3W	5V	0.6A	IP20	View

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