Mean Well DDR-120A-12 DC-DC Converter - 99.6W - Best Stock Availability & Prices

Overview

DDR-120A-12 is the 12V output model of this series: rated current 8.3A, rated power 99.6W, 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-12Specifications from the official datasheet (2026-09-10 edition)

OUTPUT

DC VOLTAGE: 12V
RATED CURRENT: 8.3A
CURRENT RANGE: 0 ~ 8.3A
RATED POWER: 99.6W
PEAK CURRENT: 12.45A
PEAK POWER^Note.5: 150W (3sec.)
RIPPLE & NOISE (max.)^Note.2: 50mVp-p
VOLTAGE ADJ. RANGE: 9 ~ 14V
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: 14.4 ~ 16.8V 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 -----
Harmonic Current ----- -----
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	-----
Harmonic Current	-----	-----

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-12 Block Diagram — Block Diagram

DDR-120A-12 Derating Curve — Derating Curve

DDR-120A-12 Input Under-Voltage Protection — Input Under-Voltage Protection

DDR-120A-12 Inrush Current — Inrush Current

DDR-120A-12 Efficiency vs Load & Vin Curve — Efficiency vs Load & Vin Curve

DDR-120A-12 D D R - 1 2 0 series — D D R - 1 2 0 series

DDR-120A-12 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-12 to power 12V embedded systems in a DIN rail control panel?

Yes. The DDR-120A-12 delivers 12V at up to 8.3A (99.6W), which suits many embedded controllers and single-board computers mounted in DIN rail enclosures. Its 9–18V DC input range is designed for battery-bus or low-voltage DC distribution systems commonly found in telecom and mobile equipment.

Is the DDR-120A-12 suitable for powering 12V sensors and I/O modules in industrial automation?

It can work well for sensor loops and I/O modules that run on 12V DC, provided total current draw stays within 8.3A. The 4KVdc input-to-output isolation helps protect sensitive measurement equipment from electrical noise in industrial environments.

Can I use this converter to turn a 12V battery bank into a regulated 12V rail?

The DDR-120A-12 accepts 9–18V DC input, so a nominal 12V battery source falls within range. It provides a regulated, isolated 12V output at up to 8.3A, which is useful for isolating sensitive loads from battery voltage fluctuations in mobile or off-grid installations. Note that output derating may be needed at low input voltage; check the derating curve.

Will the DDR-120A-12 operate reliably in an unheated outdoor cabinet during winter?

The DDR-120A-12 is rated for an operating temperature range of -40°C to +70°C (with derating at the upper end per the derating curve), so it can handle extreme cold. It is rated for 5–95% RH non-condensing, so the enclosure should protect it from direct moisture and condensation.

How does the DDR-120A-12 compare to other models in the DDR-120 series?

The DDR-120A sub-series accepts 9–18V DC input and comes in 12V (99.6W, 8.3A), 24V (100.8W, 4.2A), and 48V (100.8W, 2.1A) output variants. The DDR-120B accepts 16.8–33.6V input, the DDR-120C accepts 33.6–67.2V input, and the DDR-120D accepts 67.2–154V input, each available in 12V, 24V, and 48V outputs at 120W. All share the same 125.2 x 102.0 x 32.0 mm DIN rail form factor.

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Model	Power	Voltage	Current	IP Rating
Mean Well DDR-120A-48 DC-DC Converter - 100.8W - 9~18V in 48V out 2.1A	100.8W	48V	2.1A	IP20	View
Mean Well DDR-120A-24 DC-DC Converter - 100.8W - 9~18V in 24V out 4.2A	100.8W	24V	4.2A	IP20	View

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Mean Well DDR-120A-12 DC-DC Converter - 99.6W - 9~18V in 12V out 8.3A

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Overview

Features

Specifications

OUTPUT

INPUT

PROTECTION

ENVIRONMENT

SAFETY & EMC

OTHERS

Technical drawings

Typical applications

Downloads

Certificates2

Catalogues2

FAQ

Payment & Security

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Mean Well DDR-120A-12 DC-DC Converter - 99.6W - 9~18V in 12V out 8.3A

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