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Mean Well MDD03F-12 Medical Grade DC/DC Converter 3W - 9-36V input, 12 and -12V output 250mA

12V3WDC/DCMedical Grade

SKU MDD03F-12

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Overview

MDD03F-12 is the ±12V output model of this series: rated power 3W, typical efficiency 79%.

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

MDD03F-12Specifications from the official datasheet (2025-07-28 edition)

INPUT

INPUT VOLTAGE (RANGE): Normal 12V,24V (9 ~ 36V)
INPUT CURRENT NO LOAD: 20mA
INPUT CURRENT FULL LOAD: 316mA
VOLTAGE RANGE: 9 ~ 36Vdc ,
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.): 79%
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

MDD03F-12 Mechanical Specification — Mechanical Specification

MDD03F-12 Plug Assignment — Plug Assignment

MDD03F-12 MDS03 & MDD03 series — MDS03 & MDD03 series

MDD03F-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 MDD03F-12 Test Report PDF Download

FAQ

Can I use the MDD03F-12 in medical electronics that need a compact +/-12V power rail?

Yes, this is a medical grade DC/DC converter with constant-voltage 12 and -12V output. Its 3W power rating and up to 125mA per output fit low-power medical or healthcare electronics that need an auxiliary +/-12V rail.

Is the MDD03F-12 suitable for industrial control or embedded analog circuits powered from different system voltages?

It is suited to systems that may vary across the converter's 9-36VDC input range but still need a regulated +/-12V output. With 3W available, it is better matched to low-power analog, sensing, and interface functions than to larger control loads.

Can the MDD03F-12 power signal-conditioning or measurement stages in instrumentation equipment?

That is a typical fit when the circuit requires constant-voltage 12 and -12V rails and stays within 125mA per output and 3W total power. The compact 31.8 x 20.3 x 12.2 mm form factor also supports dense instrumentation designs.

Will the MDD03F-12 handle demanding temperature conditions inside equipment?

Its rated operating temperature is -40°C to +90°C, with load derating at higher temperatures per the derating curve, which supports use in equipment exposed to broad temperature swings. Because no IP rating is listed, environmental sealing still depends on the final enclosure rather than the converter body.

What is the difference between the MDD03F-12 and the other MDD03F versions?

All three are 3W medical grade converters with 9-36VDC input, but the outputs differ: MDD03F-05 is ±5V at 300mA, MDD03F-12 is ±12V at 125mA, and MDD03F-15 is ±15V at 100mA per output. The MDD03F-12 is the middle-voltage option in that group.

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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-12 Medical Grade DC/DC Converter 3W - 18-75V input, 12 and -12V output 250mA	3W	12V	0.25A	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-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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