Mean Well DDR-30L-12 DC-DC Converter - 30W

Name: Mean Well DDR-30L-12 DC-DC Converter - 30W - 18~75V in 12V out 2.5A
Brand: Mean Well
SKU: DDR-30L-12
Price: 29.75 USD
Availability: InStock

Overview

DDR-30L-12 is the 12V output model of this series: rated current 2.5A, rated power 30W, typical efficiency 89%.

DDR-30 series is a 30W DIN Rail type DC-DC converter with main features including DIN rail-type easy installation, ultra slim width (35mm), 4:1 ultra wide input voltage, -40~+85℃ wide operating temperature, 4KVdc I/O isolation, adjustable output voltage ( 10%) and full protective functions..etc. This series has two input options: 9~36V /18~75V and various output options: 5V / 12V / 15V / 24V and can be used for industrial control, security control, communication system and other fields. Suitable applications are DC buck/boost regulator, increasing system insulation level and voltage drop compensation along cable...etc.

Features

Width only 35mm (2SU)
4:1 ultra wide input range
-40~+85℃ wide working temperature
No minimum load required
DC output adjustable (±10%)
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)
3 years warranty

Specifications

DDR-30L-12Specifications from the official datasheet (2026-03-31 edition)

OUTPUT

DC VOLTAGE: 12V
RATED CURRENT: 2.5A
CURRENT RANGE: 0 ~ 2.5A
RATED POWER: 30W
RIPPLE & NOISE (max.)^Note.2: 75mVp-p
VOLTAGE ADJ. RANGE: 9 ~ 13.2V
VOLTAGE TOLERANCE^Note.3: ±2.0%
LINE REGULATION: ±0.5%
LOAD REGULATION: ±0.5%
SETUP, RISE TIME: 120ms, 85ms at full load
HOLD UP TIME (Typ.): L-type: 18ms@48Vdc input
EXTERNAL CAPACITANCE LOAD (Max.): 2200μF

INPUT

VOLTAGE RANGE^Note.4: 18 ~ 75Vdc
EFFICIENCY (Typ.): 89%
DC CURRENT (Typ.): 0.8A /48Vdc
INRUSH CURRENT (Typ.): 15A /48Vdc

PROTECTION

OVERLOAD: 110 ~ 150% rated output power Protection type : Constant current limiting, recovers automatically after fault condition is removed
OVER VOLTAGE: 13.8 ~ 16.2V 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: 24Vin (G-type):Power ON≥9V , OFF≤8.5V 48Vin (L-type):Power ON≥18V , OFF≤17V

ENVIRONMENT

WORKING TEMP.: -40 ~ +85℃ (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 ~ 60℃ )
VIBRATION: Component:10 ~ 500Hz, 2G 10min./1cycle, 60min. each along X, Y, Z axes; Mounting: Compliance to IEC60068-2-6
OPERATING ALTITUDE: 5000 meters

SAFETY & EMC

SAFETY STANDARDS: UL/IEC 62368-1 ,AS/NZS 62368.1 approved; Design refer to UL508
WITHSTAND VOLTAGE: I/P-O/P:4KVdc
ISOLATION RESISTANCE: I/P-O/P>100M Ohms / 500Vdc / 25℃/ 70% RH
EMC EMISSION: 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 5}: 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; 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

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; 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: 2780.3K hrs min. Telcordia SR-332 (Bellcore) ; 483.8K hrs min. MIL-HDBK-217F (25℃)
DIMENSION: 35*90*54.5mm (W*H*D)
PACKING: 0.12Kg;96pcs/12.5Kg/1.1CUFT
UL: UL62368-1

Test conditions and notes6

1. All parameters NOT specially mentioned are measured at normal input (G:24Vdc, L:48Vdc), 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. 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 )
6. 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-30L-12 Block Diagram — Block Diagram

DDR-30L-12 Derating Curve — Derating Curve

DDR-30L-12 Mechanical Specification — Mechanical Specification

Typical applications

Downloads

Certificates3

CE Certificate(DDR-30)(EN) PDF Download

UL Certificate(DDR-30)(EN) PDF Download

EMC Certificate(DDR-30)(EN) PDF Download

Catalogues2

Mean Well DC-DC Catalog PDF Download

Mean Well Catalog (Industrial) PDF Download

FAQ

Can I use the DDR-30L-12 to power 12V sensors and relays in a DIN rail automation panel?

Yes. The DDR-30L-12 outputs 12V at up to 2.5A (30W), which is sufficient for small sensor arrays, relay modules, and indicator lights commonly found in industrial control panels. Its DIN rail mount and ultra slim 35mm width make it easy to fit into standard enclosures alongside PLCs and terminal blocks.

Is the DDR-30L-12 suitable for converting a 48V DC bus to 12V for embedded computing boards?

Yes. With its 18-75V DC input range, it accepts 48V nominal bus voltages commonly found in telecom and data center environments. It provides a stable 12V output at up to 2.5A with 4KVdc I/O isolation, protecting sensitive embedded boards from ground loops and transients on the main bus.

Can the DDR-30L-12 power 12V LED indicator panels in a railway or transportation control cabinet?

Yes, if the cabinet's DC supply stays within the 18-75V DC input range, such as a 24V or 48V nominal battery system (a 72V nominal system leaves very little headroom below the 75V maximum). It delivers 12V at up to 2.5A for LED indicator panels, has a -40°C to +85°C working temperature (with derating at high ambient), and is vibration-tested at 10-500Hz, 2G along X, Y and Z axes.

Will the DDR-30L-12 operate reliably in an unheated outdoor electrical enclosure?

The DDR-30L-12 is rated for a working temperature of -40°C to +85°C, so it handles extreme cold and heat inside sealed enclosures, with load derating at high ambient according to the derating curve. Humidity is rated 5-95% RH non-condensing. However, it does not carry an IP rating, so it should be mounted inside a weatherproof enclosure rather than exposed directly to rain.

What is the difference between the DDR-30L and DDR-30G series?

Both the DDR-30L and DDR-30G deliver 30W and share the same output voltage options (5V, 12V, 15V, 24V). The key difference is input voltage range: the DDR-30L accepts 18-75V DC, while the DDR-30G accepts 9-36V DC. Typical efficiency is also slightly higher on the L models (86-91% vs 85-89%). Choose the L series for 48V bus systems, and the G series for 12V or 24V bus systems.

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Model	Power	Voltage	Current	IP Rating	Price
Mean Well DDR-30L-5 DC-DC Converter - 30W - 18~75V in 5V out 6A	30W	5V	6A	IP20	$25.95	View
Mean Well DDR-30L-24 DC-DC Converter - 30W - 18~75V in 24V out 1.25A	30W	24V	1.25A	IP20	$29.75	View
Mean Well DDR-30L-15 DC-DC Converter - 30W - 18~75V in 15V out 2A	30W	15V	2A	IP20	$26.19	View

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Mean Well DDR-30L-12 DC-DC Converter - 30W - 18~75V in 12V out 2.5A

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