MEAN WELL MDD03 series: Dual-output regulated medical DC/DC converter - MDD03F-12

Description

MDD03F-12 — Dual-output regulated medical DC/DC converter

MEAN WELL MDD03F-12 is a 3 W isolated dual-output regulated medical DC/DC converter with a 9–36 V DC input range and ±12 V DC output. Its DIP 24 package, 4:1 input range, low patient leakage and reinforced isolation support medical and industrial system integration. Observe the minimum load on each output rail and the temperature derating curve.

Download MEAN WELL MDD03 Datasheet (PDF)
Download MEAN WELL EMI Testing Guidance (PDF)

MDD03 section: PDF pages 11–16, edition 2025-07-28. Refer to the model-selection table, pin layout and applicable derating curve for this complete model.

Model and electrical selection

Model and package MDD03F-12; 3 W isolated regulated medical DC/DC converter in a DIP 24 package with standard pinout. S denotes single output and D denotes dual output.
DC input range 9–36 V DC, 4:1 range; listed nominal inputs 12 / 24 V DC.
Input current 20 mA at no load; 316 mA at full load.
Output voltage ±12 V DC; positive and negative rails relative to Common.
Output current range 12.5–125 mA per output rail. Maintain the specified minimum load on each rail.
Rated output power 3 W total rated output; observe the stated voltage and current limits.
Efficiency 79% typical.
Capacitive load 47 µF maximum for each output.
Input surge, filter and fuse 50 V DC input surge for 100 ms maximum. Pi-type input filter. Typical input-protection recommendation: 2 A slow-blow fuse.
Voltage accuracy and line regulation Voltage accuracy: ±2%. Line regulation: ±0.5%, measured from low line to high line at rated load.
Load regulation ±0.5%, measured from 10% to 100% rated load for MDD03.
Ripple and noise 150 mVp-p. Measured with a 20 MHz bandwidth using a 12-inch twisted pair terminated with 0.1 µF and 47 µF capacitors.
Switching frequency 250 kHz typical.

Protection and medical isolation

Short circuit and overload Continuous short-circuit protection with automatic recovery. Overload: 110–250% of rated output power, recovering automatically after the fault is removed.
Undervoltage lockout Start-up voltage: 8.8 V DC; shutdown voltage: 8 V DC, as listed in the common specification table.
Isolation and patient leakage Reinforced primary-to-secondary isolation: 2 × MOPP when the system input is 250 V AC, 50/60 Hz. The catalog specifies low patient leakage below 5 µA.
Withstand voltage Input to output: 6 kV DC or 4.2 kV AC.
Isolation resistance and capacitance Isolation resistance: 1,000 MΩ at 500 V DC, 25°C and 70% RH. Isolation capacitance: 20 pF typical.
Safety approvals IEC60601-1 (LVD), 3rd edition, and EAC TP TC 020/2011 approved. The catalog limits EAC TP TC 004 to the 48 V input type. Complete medical-equipment compliance must be assessed at system level.

EMC and circuit integration

EMC emissions BS EN/EN55011 conducted-emission entry: N/A. Radiated emissions: Class A without external EMC components; Class B requires the specified external circuit. Reconfirm final-equipment EMC.
EMC suggestion circuit The Class B suggestion circuit on PDF page 15 shows C1 and C2 each 10 µF / 50 V MLCC, L1 = 450 µH common-mode choke; C3 and C4 are marked X (not fitted). The diagram names both MDS03 and MDD03, but the component-table row is labeled MDS03F; confirm its applicability to this dual-output model with MEAN WELL before implementing it.
EMC immunity BS EN/EN61000-4-2: ±15 kV air; -4-3: 10 V/m; -4-4: ±2 kV; -4-5: ±2 kV line to line; -4-6: 10 Vrms (e.m.f.); -4-8: 30 A/m.

Thermal, environmental and assembly limits

Operating temperature and derating −40 to +90°C with free-air convection. The natural-convection curve shows full load through +71°C, 75% at +80°C and 50% at +90°C. The plot beyond +90°C does not extend the specified operating range.
Case temperature and humidity Case temperature: +105°C maximum. Working humidity: 20–90% RH, non-condensing.
Storage −55 to +125°C; 10–95% RH, non-condensing.
Temperature coefficient 0.05%/°C over 0–71°C.
Soldering At 1.5 mm from the case: 3–5 seconds, 265°C maximum.
Vibration 10–500 Hz, 2 G; 10 minutes per cycle, for 60 minutes along each X, Y and Z axis.

Mechanical layout and pin assignment

Dimensions and case 31.8 × 20.3 × 12.2 mm (L × W × H); UL94V-0 plastic case.
Mechanical tolerances General x.x / x.xx dimensions: ±0.5 mm. Pin size: 0.6 ±0.10 mm; lead extension: 3.81 mm.
PCB footprint Top-view PCB layout: Ø0.8 mm holes (+0.2 / −0); 2.54 mm grid and 15.24 mm pin-row spacing. The body drawing gives a 2.06 mm end offset and a 5.08 mm span between pins 10 and 12 / pins 15 and 13. Verify orientation using the bottom-view module and top-view PCB drawings on PDF page 14.
Pin assignment Pin 1: +Vin; pin 10: no pin; pin 11: Common; pin 12: no pin; pin 13: −Vout; pin 15: +Vout; pins 23 and 24: −Vin.

Test conditions, packing and applications

Specification test conditions Unless otherwise stated: 12 V DC normal input for the F model, rated load, 25°C and 70% RH ambient.
MTBF Greater than 454 kh, MIL-HDBK-217F at 25°C.
Unit weight 17 g catalog packing reference per unit; not a separately measured net weight.
Bulk packing 15 units per tube, 750 units in 50 tubes maximum per carton. One tube gross weight: 310 g; carton gross weight: 16.1 kg. Carton: 620 × 230 × 230 mm. The packing illustration shows a 520 mm tube length and a 24 × 21.3 mm outer cross-section.
Typical applications Medical devices, oxygen monitors, CT scanning, medical carts, oral-care equipment and industrial control systems.
Manufacturer warranty The manufacturer datasheet states a 3-year warranty; confirm the applicable supply and service terms.

Component and system EMC guidance

Complete-system EMC verification Verify EMC with the converter installed in the final equipment and connected to a representative load. Wiring, assembly and the application affect the result. Follow the model's specified EMC conditions and any required external components; the linked EMI testing guidance does not certify the finished equipment.

MEAN WELL MDD03 series: Dual-output regulated medical DC/DC converter - MDD03F-12

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MDD03F-12 — Dual-output regulated medical DC/DC converter MEAN WELL MDD03F-12 is a 3 W isolated dual-output regulated medical DC/DC converter... Read more

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    Description

    MDD03F-12 — Dual-output regulated medical DC/DC converter

    MEAN WELL MDD03F-12 is a 3 W isolated dual-output regulated medical DC/DC converter with a 9–36 V DC input range and ±12 V DC output. Its DIP 24 package, 4:1 input range, low patient leakage and reinforced isolation support medical and industrial system integration. Observe the minimum load on each output rail and the temperature derating curve.

    Download MEAN WELL MDD03 Datasheet (PDF)
    Download MEAN WELL EMI Testing Guidance (PDF)

    MDD03 section: PDF pages 11–16, edition 2025-07-28. Refer to the model-selection table, pin layout and applicable derating curve for this complete model.

    Model and electrical selection

    Model and package MDD03F-12; 3 W isolated regulated medical DC/DC converter in a DIP 24 package with standard pinout. S denotes single output and D denotes dual output.
    DC input range 9–36 V DC, 4:1 range; listed nominal inputs 12 / 24 V DC.
    Input current 20 mA at no load; 316 mA at full load.
    Output voltage ±12 V DC; positive and negative rails relative to Common.
    Output current range 12.5–125 mA per output rail. Maintain the specified minimum load on each rail.
    Rated output power 3 W total rated output; observe the stated voltage and current limits.
    Efficiency 79% typical.
    Capacitive load 47 µF maximum for each output.
    Input surge, filter and fuse 50 V DC input surge for 100 ms maximum. Pi-type input filter. Typical input-protection recommendation: 2 A slow-blow fuse.
    Voltage accuracy and line regulation Voltage accuracy: ±2%. Line regulation: ±0.5%, measured from low line to high line at rated load.
    Load regulation ±0.5%, measured from 10% to 100% rated load for MDD03.
    Ripple and noise 150 mVp-p. Measured with a 20 MHz bandwidth using a 12-inch twisted pair terminated with 0.1 µF and 47 µF capacitors.
    Switching frequency 250 kHz typical.

    Protection and medical isolation

    Short circuit and overload Continuous short-circuit protection with automatic recovery. Overload: 110–250% of rated output power, recovering automatically after the fault is removed.
    Undervoltage lockout Start-up voltage: 8.8 V DC; shutdown voltage: 8 V DC, as listed in the common specification table.
    Isolation and patient leakage Reinforced primary-to-secondary isolation: 2 × MOPP when the system input is 250 V AC, 50/60 Hz. The catalog specifies low patient leakage below 5 µA.
    Withstand voltage Input to output: 6 kV DC or 4.2 kV AC.
    Isolation resistance and capacitance Isolation resistance: 1,000 MΩ at 500 V DC, 25°C and 70% RH. Isolation capacitance: 20 pF typical.
    Safety approvals IEC60601-1 (LVD), 3rd edition, and EAC TP TC 020/2011 approved. The catalog limits EAC TP TC 004 to the 48 V input type. Complete medical-equipment compliance must be assessed at system level.

    EMC and circuit integration

    EMC emissions BS EN/EN55011 conducted-emission entry: N/A. Radiated emissions: Class A without external EMC components; Class B requires the specified external circuit. Reconfirm final-equipment EMC.
    EMC suggestion circuit The Class B suggestion circuit on PDF page 15 shows C1 and C2 each 10 µF / 50 V MLCC, L1 = 450 µH common-mode choke; C3 and C4 are marked X (not fitted). The diagram names both MDS03 and MDD03, but the component-table row is labeled MDS03F; confirm its applicability to this dual-output model with MEAN WELL before implementing it.
    EMC immunity BS EN/EN61000-4-2: ±15 kV air; -4-3: 10 V/m; -4-4: ±2 kV; -4-5: ±2 kV line to line; -4-6: 10 Vrms (e.m.f.); -4-8: 30 A/m.

    Thermal, environmental and assembly limits

    Operating temperature and derating −40 to +90°C with free-air convection. The natural-convection curve shows full load through +71°C, 75% at +80°C and 50% at +90°C. The plot beyond +90°C does not extend the specified operating range.
    Case temperature and humidity Case temperature: +105°C maximum. Working humidity: 20–90% RH, non-condensing.
    Storage −55 to +125°C; 10–95% RH, non-condensing.
    Temperature coefficient 0.05%/°C over 0–71°C.
    Soldering At 1.5 mm from the case: 3–5 seconds, 265°C maximum.
    Vibration 10–500 Hz, 2 G; 10 minutes per cycle, for 60 minutes along each X, Y and Z axis.

    Mechanical layout and pin assignment

    Dimensions and case 31.8 × 20.3 × 12.2 mm (L × W × H); UL94V-0 plastic case.
    Mechanical tolerances General x.x / x.xx dimensions: ±0.5 mm. Pin size: 0.6 ±0.10 mm; lead extension: 3.81 mm.
    PCB footprint Top-view PCB layout: Ø0.8 mm holes (+0.2 / −0); 2.54 mm grid and 15.24 mm pin-row spacing. The body drawing gives a 2.06 mm end offset and a 5.08 mm span between pins 10 and 12 / pins 15 and 13. Verify orientation using the bottom-view module and top-view PCB drawings on PDF page 14.
    Pin assignment Pin 1: +Vin; pin 10: no pin; pin 11: Common; pin 12: no pin; pin 13: −Vout; pin 15: +Vout; pins 23 and 24: −Vin.

    Test conditions, packing and applications

    Specification test conditions Unless otherwise stated: 12 V DC normal input for the F model, rated load, 25°C and 70% RH ambient.
    MTBF Greater than 454 kh, MIL-HDBK-217F at 25°C.
    Unit weight 17 g catalog packing reference per unit; not a separately measured net weight.
    Bulk packing 15 units per tube, 750 units in 50 tubes maximum per carton. One tube gross weight: 310 g; carton gross weight: 16.1 kg. Carton: 620 × 230 × 230 mm. The packing illustration shows a 520 mm tube length and a 24 × 21.3 mm outer cross-section.
    Typical applications Medical devices, oxygen monitors, CT scanning, medical carts, oral-care equipment and industrial control systems.
    Manufacturer warranty The manufacturer datasheet states a 3-year warranty; confirm the applicable supply and service terms.

    Component and system EMC guidance

    Complete-system EMC verification Verify EMC with the converter installed in the final equipment and connected to a representative load. Wiring, assembly and the application affect the result. Follow the model's specified EMC conditions and any required external components; the linked EMI testing guidance does not certify the finished equipment.

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