Mean Well DDR-15L-3.3 DC-DC Converter

Name: Mean Well DDR-15L-3.3 DC-DC Converter - 11.6W - 18~75V in 3.3V out 4.5A
Brand: Mean Well
SKU: DDR-15L-3.3
Price: 19.67 USD
Availability: InStock

Overview

DDR-15L-3.3 is the 3.3V output model of this series: rated current 4.5A, rated power 15W, typical efficiency 84%.

DDR-15 series is a 15W DIN Rail type DC-DC converter with main features including DIN rail-type easy installation, ultra slim width (17.5mm), 4: 1 ultra wide input voltage, -40~+85℃ wide operating temperature, 4KVdc I/O isolation, adjustable output voltage ( 10%) and full protection level and voltage drop compensation along cable...etc. This series has two input options: 9~36V /18~75V and various output options: 3.3V / 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, etc.

Features

Width only 17.5mm (1SU)
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-15L-3.3Specifications from the official datasheet (2026-03-31 edition)

OUTPUT

DC VOLTAGE: 3.3V
RATED CURRENT: 4.5A
CURRENT RANGE: 0 ~ 4.5A
RATED POWER: 15W
RIPPLE & NOISE (max.)^Note.2: 50mVp-p
VOLTAGE ADJ. RANGE: 3.0 ~ 3.6V
VOLTAGE TOLERANCE^Note.3: ±2.0%
LINE REGULATION: ±0.5%
LOAD REGULATION: ±1.5%
SETUP, RISE TIME: 120ms, 85ms at full load
HOLD UP TIME (Typ.): L-type: 16ms@48Vdc input
EXTERNAL CAPACITANCE LOAD (Max.): 3300μF

INPUT

VOLTAGE RANGE^Note.4: 18 ~ 75Vdc
EFFICIENCY (Typ.): 84%
DC CURRENT (Typ.): 0.4A /48Vdc
INRUSH CURRENT (Typ.): 15A /48Vdc

PROTECTION

OVERLOAD: 110 ~ 150% rated output power Protection type : Hiccup mode, recovers automatically after fault condition is removed
OVER VOLTAGE: 3.8 ~ 4.7V 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: 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: 2000 meters

SAFETY & EMC

SAFETY STANDARDS: IEC 62368-1 (LVD) ,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: 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: 907K hrs min. MIL-HDBK-217F (25℃)
DIMENSION: 17.5*90*54.5mm (W*H*D)
PACKING: 68g; 160pcs/12Kg/1.19CUFT

Test conditions and notes6

1. All parameters NOT specially mentioned are measured at 48VDC input, 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-15L-3.3 Block Diagram — Block Diagram

DDR-15L-3.3 Derating Curve — Derating Curve

DDR-15L-3.3 Mechanical Specification — Mechanical Specification

Typical applications

Downloads

Certificates3

UL Certificate(DDR-15)(EN) PDF Download

CE Certificate(DDR-15)(EN) PDF Download

EMC Certificate(DDR-15)(EN) PDF Download

Catalogues2

Mean Well DC-DC Catalog PDF Download

Mean Well Catalog (Industrial) PDF Download

FAQ

Can I use the DDR-15L-3.3 to power 3.3V microcontrollers or FPGAs from a 48V DC bus?

Yes. The DDR-15L-3.3 accepts 18-75V DC input and outputs 3.3V at up to 4.5A. This makes it suitable for powering 3.3V microcontrollers, FPGAs, or other digital logic boards directly from a 48V telecom or industrial DC bus.

Is the DDR-15L-3.3 a good fit for powering IoT gateway boards in a 48V solar-powered installation?

Yes. The 18-75V input range accommodates 48V battery systems, and the 3.3V/4.5A output can power 3.3V IoT gateway boards or LoRa/Zigbee communication modules. The 4KVdc input-to-output isolation separates the IoT electronics from the solar battery bus.

Can the DDR-15L-3.3 power 3.3V RS-485 transceivers or serial communication modules on DIN rail?

Yes. The DDR-15L-3.3 provides 3.3V at up to 4.5A, which is more than sufficient for RS-485 transceivers, serial-to-Ethernet converters, or communication interface boards. Its 17.5 mm width conserves valuable space in crowded communication panels.

Does the DDR-15L-3.3 need derating at elevated ambient temperatures?

Yes. The DDR-15L-3.3 is rated for -40°C to +85°C operation, and the datasheet refers this range to its derating curve; derating may also be needed under low input voltage. Consult the Mean Well datasheet derating curve to ensure full 4.5A output is available at your expected ambient temperature.

How does the DDR-15L-3.3 compare to the DDR-15G-3.3 for 3.3V applications?

The DDR-15G-3.3 accepts 9-36V DC input at 3.5A (11.6W) output, while the DDR-15L-3.3 accepts 18-75V DC input at 4.5A (15W) output. Choose the G variant for 12V or 24V source buses, and the L variant for 48V or higher-voltage DC systems. Both share the same 17.5 x 90 x 54.5 mm housing.

Can this converter supply 3.3V logic power for embedded data acquisition systems in remote utility substations?

Yes. The DDR-15L-3.3 is well suited for remote substations where a 48V DC bus is common. It can power 3.3V data acquisition boards, RTUs, or protocol converters. The -40°C to +85°C working range (with derating per the derating curve) suits unattended outdoor enclosures.

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Model	Power	Voltage	Current	IP Rating	Price
Mean Well DDR-15L-5 DC-DC Converter - 15W - 18~75V in 5V out 3A	15W	5V	3A	IP20	$22.36	View
Mean Well DDR-15L-12 DC-DC Converter - 15W - 18~75V in 12V out 1.25A	15W	12V	1.25A	IP20	$22.36	View
Mean Well DDR-15L-24 DC-DC Converter - 15W - 18~75V in 24V out 630mA	15W	24V	0.63A	IP20	$22.36	View
Mean Well DDR-15L-15 DC-DC Converter - 15W - 18~75V in 15V out 1A	15W	15V	1A	IP20	$19.67	View

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Mean Well DDR-15L-3.3 DC-DC Converter - 11.6W - 18~75V in 3.3V out 4.5A

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