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Mean Well DDR-120A-24 DC-DC Converter - 100.8W - 9~18V in 24V out 4.2A

Name: Mean Well DDR-120A-24 DC-DC Converter - 100.8W - 9~18V in 24V out 4.2A
Brand: Mean Well
SKU: DDR-120A-24
Price: 68.88 USD
Availability: InStock

2:1 or 4:1 wide input rangefanless design4KVdc I/O isolationultra slim dimensions

SKU DDR-120A-24

$68.88 USD

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Select model — 3 in this family

DDR-120A-24

DDR-120A-12 12V out 100W In stock $68.88 USD

DDR-120A-24 24V out 100W In stock $68.88 USD

DDR-120A-48 48V out 100W Low stock $60.11 USD

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Overview

DDR-120A-24 is the 24V output model of this series: rated current 4.2A, rated power 100.8W, typical efficiency 88.5%.

DDR-120 series is a 120W DIN Rail type DC-DC converter with main features including DIN rail-type easy installation, ultra slim width (32mm), 2:1 wide input voltage, fanless design, -40~+70℃ wide operating temperature, 4KVdc I/O isolation, 150% peak load, adjustable output voltage and full protective functions. This series of models has various input options: 9~18V / 16.8~33.6V / 33.6~67.2V / 67.2~154V and various output options: 12V / 24V / 48V and can be used for industrial & railway control, security control, communication system and other fields. Suitable applications include DC buck/boost regulator, increasing system insulation level and voltage drop compensation along cable...etc.

Features

Compliance to BS EN/EN50155 and BS EN/EN45545-2 railway standard
Width only 32mm
2:1 wide input range
-40~+70℃ wide working temperature
150% peak load capability
DC output adjustable
Cooling by free air convection
Can be installed on DIN rail TS-35/7.5 or 15
Protections: Short circuit / Overload / Over voltage / Input reverse polarity / Input under voltage protection
4KVdc I/O isolation(Reinforced isolation)
Conformal coating
3 years warranty

Specifications

DDR-120A-24Specifications from the official datasheet (2026-09-10 edition)

OUTPUT

DC VOLTAGE: 24V
RATED CURRENT: 4.2A
CURRENT RANGE: 0 ~ 4.2A
RATED POWER: 100.8W
PEAK CURRENT: 6.3A
PEAK POWER^Note.5: 150W (3sec.)
RIPPLE & NOISE (max.)^Note.2: 50mVp-p
VOLTAGE ADJ. RANGE: 24 ~ 28V
VOLTAGE TOLERANCE^Note.3: ±1.0%
LINE REGULATION: ±0.5%
LOAD REGULATION: ±1.0%
SETUP, RISE TIME: 500ms, 60ms @12Vdc
HOLD UP TIME (Typ.): Please refer to page 7 Hold up Time( Load de-rating curve )

INPUT

VOLTAGE RANGE^Note.4: 9 ~ 18Vdc
EFFICIENCY (Typ.): 88.5%
DC CURRENT (Typ.): 11.2A @12Vdc
INRUSH CURRENT (Typ.): 5A @12Vdc
INTERRUPTION OF VOLTAGE SUPPLY: EN50155:2021-comply with S1 level

PROTECTION

OVERLOAD: Normally works within 150% rated output power for more than 3 seconds and then constant current protection 105~135% rated output power with auto-recovery
OVER VOLTAGE: 28.8 ~ 33.6V Protection type : Shut down o/p voltage, re-power on to recover
REVERSE POLARITY: By internal MOSFET, no damage, recovers automatically after fault condition removed
UNDER VOLTAGE LOCKOUT: 12Vin (A - type) :Power ON≥9V , OFF≤8.5V

ENVIRONMENT

WORKING TEMP.: -40 ~ +70℃ (Refer to "Derating Curve")
WORKING HUMIDITY: 5 ~ 95% RH non-condensing
STORAGE TEMP., HUMIDITY: -40 ~ +85℃, 5 ~ 95% RH non-condensing
TEMP. COEFFICIENT: ±0.03%/℃ (0 ~ 55℃)
VIBRATION: Component:10 ~ 500Hz, 5G 10min./1cycle, 60min. each along X, Y, Z axes; Mounting: Compliance to IEC61373
OPERATING ALTITUDE: 5000 meters

SAFETY & EMC

SAFETY STANDARDS: IEC 62368-1, UL 62368-1, EAC TP TC 004, AS/NZS 62368.1 approved; Design refer to UL508
WITHSTAND VOLTAGE: I/P-O/P:4KVdc I/P-FG:2.5KVdc O/P-FG:2.5KVdc
ISOLATION RESISTANCE: I/P-O/P, I/P-FG, O/P-FG:>100M Ohms / 500Vdc / 25℃/ 70% RH
EMC EMISSION^{Note 6}: Parameter Standard Test Level

Conducted BS EN/EN55032 Class B
Radiated BS EN/EN55032 Class B
Voltage Flicker BS EN/EN61000-3-3
EMC IMMUNITY^{Note 6}: BS EN/EN55035 , BS EN/EN61000-6-2(BS EN/EN50082-2)

Parameter Standard Test Level

ESD BS EN/EN61000-4-2 Level 3, 8KV air; Level 3, 6KV contact; criteria A
Radiated BS EN/EN61000-4-3 Level 3, 10V/m; criteria A
EFT / Burst BS EN/EN61000-4-4 Level 3, 2KV; criteria A
Surge BS EN/EN61000-4-5 Level 3, 1KV/Line-Line ;Level 3, 2KV/Line-Line-FG ;criteria A
Conducted BS EN/EN61000-4-6 Level 3, 10V; criteria A
Magnetic Field BS EN/EN61000-4-8 Level 4, 30A/m; criteria A
RAILWAY STANDARD: Compliance to BS EN/EN45545-2 for fire protection ; Meet BS EN/EN50155 / IEC60571 including IEC61373 for shock & vibration, BS EN/EN50121-3-2 for EMC (except for 9~18Vin)

Parameter	Standard	Test Level
Conducted	BS EN/EN55032	Class B
Radiated	BS EN/EN55032	Class B
Voltage Flicker	BS EN/EN61000-3-3

Parameter	Standard	Test Level
ESD	BS EN/EN61000-4-2	Level 3, 8KV air; Level 3, 6KV contact; criteria A
Radiated	BS EN/EN61000-4-3	Level 3, 10V/m; criteria A
EFT / Burst	BS EN/EN61000-4-4	Level 3, 2KV; criteria A
Surge	BS EN/EN61000-4-5	Level 3, 1KV/Line-Line ;Level 3, 2KV/Line-Line-FG ;criteria A
Conducted	BS EN/EN61000-4-6	Level 3, 10V; criteria A
Magnetic Field	BS EN/EN61000-4-8	Level 4, 30A/m; criteria A

OTHERS

MTBF: 1769.5K hrs min. Telcordia SR-332 (Bellcore) ; 214.5K hrs min. MIL-HDBK-217F (25℃)
DIMENSION: 32*125.2*102mm (W*H*D)
PACKING: 510g; 28pcs/15.3Kg/1.23CUFT

Test conditions and notes7

1. All parameters NOT specially mentioned are measured at normal input (A:12Vdc , B:24Vdc) , rated load and 25℃ of ambient temperature.
2. Ripple & noise are measured at 20MHz of bandwidth by using a 12" twisted pair-wire terminated with a 0.1μF & 47μF parallel capacitor.
3. Tolerance : includes set up tolerance, line regulation and load regulation.
4. Derating may be needed under low input voltage. Please check the derating curve for more details.
5. 3 seconds max., please refer to peak loading curves.
6. The power supply is considered as an independent unit, but the final equipment still need to re-confirm that the whole system complies with the EMC directives. For guidance on how to perform these EMC tests, please refer to “EMI testing of component power supplies.” (as available on https://www.meanwell.com//Upload/PDF/EMI_statement_en.pdf )
7. The ambient temperature derating of 3.5℃/1000m with fanless models and of 5℃/1000m with fan models for operating altitude higher than 2000m(6500ft).

Technical drawings

DDR-120A-24 Block Diagram — Block Diagram

DDR-120A-24 Derating Curve — Derating Curve

DDR-120A-24 Input Under-Voltage Protection — Input Under-Voltage Protection

DDR-120A-24 Inrush Current — Inrush Current

DDR-120A-24 Efficiency vs Load & Vin Curve — Efficiency vs Load & Vin Curve

DDR-120A-24 D D R - 1 2 0 series — D D R - 1 2 0 series

DDR-120A-24 Mechanical Specification — Mechanical Specification

Typical applications

Downloads

Certificates2

CE Certificate(DDR-120)(EN) PDF Download

EMC Certificate(DDR-120)(EN) PDF Download

Catalogues2

Mean Well DC-DC Catalog PDF Download

Mean Well Catalog (Industrial) PDF Download

FAQ

Can I use the DDR-120A-24 to power 24V PLC modules from a low-voltage DC bus?

Yes. The DDR-120A-24 converts a 9–18V DC input to a regulated 24V output at up to 4.2A (100.8W), which is sufficient for many compact PLC systems and their associated I/O modules. The 4KVdc isolation protects the control system from noise on the input bus.

Is this converter appropriate for powering 24V solenoid valves in a mobile hydraulic system?

The DDR-120A-24 can supply 24V at 4.2A from a 9–18V DC source such as a vehicle battery system. Its DIN rail mounting, wide operating temperature range of -40°C to +70°C (with derating per the derating curve), and mounting compliance to IEC61373 for vibration make it practical for mobile machinery cabinets where vibration and temperature swings are common.

Can I use the DDR-120A-24 to generate 24V for instrumentation from a 12V solar battery bank?

Yes, as long as the battery voltage stays within the 9–18V input range. The DDR-120A-24 provides an isolated 24V output at up to 4.2A, making it suitable for stepping up a 12V nominal battery bus to power 24V field instruments or data acquisition equipment in remote solar-powered installations.

Does the DDR-120A-24 need forced airflow in a sealed DIN rail enclosure?

The datasheet does not list a forced-airflow requirement; it specifies an operating range of -40°C to +70°C with output derating at higher temperatures per the derating curve. In a sealed enclosure you should verify that the internal ambient temperature stays within the curve's limits for your load, up to the full 100.8W.

Is the DDR-120A-24 suitable for powering 24V HMI touchscreens in a process control panel?

The DDR-120A-24 outputs 24V at up to 4.2A, which is enough for most industrial HMI panels. Its slim 32 mm width conserves DIN rail space, and the 4KVdc isolation helps prevent ground loops between the low-voltage DC input bus and sensitive display electronics.

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Model	Power	Voltage	Current	IP Rating	Price
Mean Well DDR-120A-48 DC-DC Converter - 100.8W - 9~18V in 48V out 2.1A	100.8W	48V	2.1A	IP20	$60.11	View

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