Image shown is a representation only. Exact specifications should be obtained from the product datasheet.

Mean Well MDS03G-12 Medical Grade DC/DC Converter 3W - 18-75V input, 12V output 250mA

12V3WDC/DCMedical Grade

SKU MDS03G-12

Log in to see price Trade pricing & online ordering for account holders

Available to order

Overview

MDS03G-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

MDS03G-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: 160mA
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: 0 ~ 250mA
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

MDS03G-12 Mechanical Specification — Mechanical Specification

MDS03G-12 Plug Assignment — Plug Assignment

MDS03G-12 MDS03 & MDD03 series — MDS03 & MDD03 series

MDS03G-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 MDS03G-12 Test Report PDF Download

FAQ

Can I use the MDS03G-12 for a 12V industrial sensor or transmitter circuit?

Yes, if the 12V load stays within 0.25A and the total output stays within 3W. That output profile fits low-power 12V sensor, transmitter, or interface electronics using an 18-75V input source.

Is this a good choice for 12V control relays or small automation modules?

It can support small 12V control modules or relay-driven circuits when the continuous demand remains at or below 0.25A. The converter provides constant-voltage 12V output and is built in a compact 31.8 × 20.3 × 12.2 mm package.

Can the MDS03G-12 be used as a 12V auxiliary rail in embedded or medical OEM equipment?

Yes, for low-power auxiliary 12V rails up to 3W. It is a medical-grade DC/DC converter approved to IEC60601-1 3rd edition (2xMOPP) and EAC, and supports an 18-75V input range.

What is the difference between the MDS03G-12 and the other MDS03G outputs?

The MDS03G-12 shares the same 3W rating, 18-75V input range, dimensions, weight, operating temperature, and safety approvals as the other MDS03G models. The main difference is output: MDS03G-05 is 5V at 0.6A, MDS03G-12 is 12V at 0.25A, and MDS03G-15 is 15V at 0.2A.

Can the MDS03G-12 be used in cold or high-heat indoor equipment?

The specified operating range is -40°C to +90°C, with load derating at higher temperatures per the derating curve, so it is suited to equipment that sees very low or very high ambient temperatures within that band. No IP rating is provided, so these specs support temperature suitability but do not confirm exposed outdoor use.

Payment & Security

Payment methods

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.

Please log in to write a review.

{ "id":8442610483499, "variants" :[{ "context":"default", "variant_id": 45711612248363, "sku":"MDS03G-12", "inventory_qty" : 0, "customer" :false, "custom_html" :"\u003ca class=\"text-current logged-out-price logged-out\" href=\"https:\/\/wellforces.co.nz\/customer_authentication\/redirect?locale=en\u0026region_country=NZ\"\u003e\n \u003cspan \u003ePlease \u003c\/span\u003e \u003cspan class=\"login-text\"\u003eLogin\u003c\/span\u003e \u003cspan\u003e for Pricing\u003c\/span\u003e\n \u003c\/a\u003e", "volume_html" :"\u003cvolume-pricing class=\"parent-display inside_product_form\" id=\"volume-pricing-main\" \u003e\u003c\/volume-pricing\u003e" } ] }