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Mean Well RSDW20UW-12 Ultra-wide input DC/DC LED Driver 20W 12V - Heavy Duty 1.67A

compliance with EN50155 and EN45545 railway standards2:1 or 4:1 wide input rangeisolation 4000VDC1U low profilehalf encapsulated

SKU RSDW20UW-12

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Overview

RSDW20UW-12 is the 12V output model of this series: rated power 20W, typical efficiency 89%.

RSDW20UW and RDDW20UW series are 20W module type DC-DC reliable railway converter with 2"x1" package. It features international standard pins, a high efficiency up to 89%, wide working temperature range -40~+95℃, 3KVAC I/P-O/P isolation voltage, meet EN50155 with external circuits, continuous-mode short circuit protection, etc. The models account for 8.5~160VDC 18:1 ultra-wide input range, and various output voltage, 5V/12V/15V for single output and ±12V/±15V/±24V for dual outputs, which are suitable for railway, trams, buses and also can be used in the harsh environment with high vibration, high dust, extremely low or high temperature, etc.

Features

Compliance with railway standard EN50155
DIP 2"x1" package with standard pinout
18:1(8.5~160Vdc) ultra-wide input range
Wide operating temperature range -40 ~ +95℃
No minimum load required
Full encapsulated
Protections: Short circuit (Continuous) / Overload / Over Voltage / Input under voltage
3KVAC I/O isolation
Operating altitude up to 5000 meters (Note.5)
Remote ON/OFF control
3 years warranty

Specifications

RSDW20UW-12Specifications from the official datasheet (2024-11-18 edition)

MODEL SELECTION TABLE

INPUT VOLTAGE (RANGE): Normal 12V,24V,48V,72V,96V,110V (8.5 ~ 160V)
INPUT CURRENT NO LOAD: 10mA
INPUT CURRENT FULL LOAD: 312mA
OUTPUT VOLTAGE: 12V
OUTPUT CURRENT: 1670mA
EFFICIENCY (Typ.): 89%
CAPACITOR LOAD (MAX.)^{* For each output}: 3300μF

INPUT

VOLTAGE RANGE: 8.5 ~ 160Vdc
SURGE VOLTAGE (100ms max.): 200Vdc
FILTER: Pi type
PROTECTION: 4A fast acting fuse

OUTPUT

VOLTAGE ACCURACY: ±1.0%
RATED POWER: 20W
RIPPLE & NOISE^Note.2: 100mVp-p
LINE REGULATION^Note.3: ±0.2%
LOAD REGULATION^Note.4: Single output models: ±0.3%, Dual output models:±1%
CROSS REGULATION: ±5% @ 25%~100% load
SWITCHING FREQUENCY (Typ.): 200KHz
EXTERNAL TRIM ADJ. RANGE (Typ.): -20% ~ +15% (Single output model only)

PROTECTION

SHORT CIRCUIT: Protection type : Continuous, automatic recovery
OVERLOAD: 110 ~ 180% rated output power Protection type : Recovers automatically after fault condition is removed
OVER VOLTAGE: Protection type : Clamp by diode
UNDER VOLTAGE LOCKOUT Start-up voltage: 9Vdc
UNDER VOLTAGE LOCKOUT Shutdown voltage: 8Vdc

FUNCTION

REMOTE CONTROL: Power ON: >4.0~160Vdc or open circuit Power OFF: <1.2Vdc or short

ENVIRONMENT

COOLING: Free-air convection
WORKING TEMP.: -40 ~ +95℃ (Refer to "Derating Curve")
CASE TEMPERATURE: +105℃ max. (+110℃ thermal shutdown)
WORKING HUMIDITY: 20% ~ 90% RH non-condensing
STORAGE TEMP., HUMIDITY: -55 ~ +125℃, 10 ~ 95% RH non-condensing
TEMP. COEFFICIENT: 0.03% / ℃ (0 ~ 95℃)
SOLDERING TEMPERATURE: 1.5mm from case of 1 ~ 3sec./260℃ max.
VIBRATION: 10 ~ 500Hz, 2G 10min./1cycle, period for 60min. each along X, Y, Z axes
OPERATING ALTITUDE^Note.5: 5000 meters

SAFETY & EMC ( Note.6)

SAFETY STANDARDS: UL62368-1, EAC TP TC 004 approved
WITHSTAND VOLTAGE: I/P-O/P:3KVAC
ISOLATION RESISTANCE: I/P-O/P:100M Ohms / 500VDC / 25℃/ 70% RH
ISOLATION CAPACITANCE (Typ.): 20pF
EMC EMISSION: Parameter Standard Test Level

Conducted BS EN/EN50121-3-2 Class A/B with external components
Radiated BS EN/EN50121-3-2 N/A
EMC IMMUNITY: Parameter Standard Test Level

ESD BS EN/EN61000-4-2 Level 3, ±8KV air, ±6KV contact
Radiated Susceptibility BS EN/EN61000-4-3 Level 3, 80~1000MHz, 20V/m
EFT/Bursts BS EN/EN61000-4-4 Level 3, On power input port,±2KV external input capacitor required
Surge BS EN/EN61000-4-5 Level 4, Line to earth, ±4KV Line to Line, ±2KV
Conducted BS EN/EN61000-4-6 Level 3, 0.15~80MHz, 10V
RAILWAY STANDARD: EN50155 including EN61373 for shock & vibration, EN50121-3-2 for EMC

Parameter	Standard	Test Level
Conducted	BS EN/EN50121-3-2	Class A/B with external components
Radiated	BS EN/EN50121-3-2	N/A

Parameter	Standard	Test Level
ESD	BS EN/EN61000-4-2	Level 3, ±8KV air, ±6KV contact
Radiated Susceptibility	BS EN/EN61000-4-3	Level 3, 80~1000MHz, 20V/m
EFT/Bursts	BS EN/EN61000-4-4	Level 3, On power input port,±2KV external input capacitor required
Surge	BS EN/EN61000-4-5	Level 4, Line to earth, ±4KV Line to Line, ±2KV
Conducted	BS EN/EN61000-4-6	Level 3, 0.15~80MHz, 10V

OTHERS

MTBF: 1570Khrs MIL-HDBK-217F(25℃)
DIMENSION (L*W*H): 50.8*25.4*10.2mm (2*1*0.4 inch)
CASE MATERIAL: Black coated copper with Non-Conductive Base
PACKING: 35g ; 12pcs/per tube, 300pcs/25 tube/per carton

Test conditions and notes6

1.All parameters are specified at normal input(72Vdc), rated load, 25℃ 70% RH ambient.
2.Ripple & noise are measured at 20MHz by using a 12" twisted pair terminated with a 0.1μf & 47μf capacitor.
3.Line regulation is measured from low line to high line at rated load.
4.Load regulation is measured from 0% to 100% rated load.
5.The ambient temperature derating of 3.5℃/1000m for operating altitude higher than 2000m(6500ft).
6.The final equipment must be re-confirm that it still meet EMC directives. For guidance on how to perform these EMC tests, please refer to “EMI testing of component power supplies.”(as available on http://www.meanwell.com)

Technical drawings

RSDW20UW-12 Illustration (page 4) — Illustration (page 4)

RSDW20UW-12 Table 1 – The typical value of Rtrim-up — Table 1 – The typical value of Rtrim-up

RSDW20UW-12 Table 2 – The typical value of Rtrim-down — Table 2 – The typical value of Rtrim-down

RSDW20UW-12 Mechanical Specification — Mechanical Specification

RSDW20UW-12 EMC Suggestion Circuit — EMC Suggestion Circuit

Typical applications

Bus, tram, metro or railway system
Telecom/datacom system
Wireless network
Industrial control facility
Instrument
Analyzer
Highly vibrating, heavily dusty, extremely low or high temperature harsh environment

Downloads

Certificates5

Mean Well RSDW20UW-RDDW20UW-EMC(50155) Certificate PDF Download

Mean Well RSDW20UW-RDDW20UW-CE-dec Certificate PDF Download

Mean Well RSDW20UW-RDDW20UW-EMC (55032) Certificate PDF Download

Mean Well RSDW20UW-RDDW20UW-LVD Certificate PDF Download

Mean Well RSDW20UW-RDDW20UW-UK-dec Certificate PDF Download

FAQ

Can I use the RSDW20UW-12 to power 12V automation electronics from a very wide input range?

Yes, if the load needs regulated 12V power and stays within 1.67A and 20W. This version is designed for an 8.5~160VDC input range, which supports systems operating across that full specified span.

Is this model suitable for 12V control, monitoring, or interface modules in heavy-duty equipment?

It can be used for 12V control, monitoring, or interface modules that do not exceed 1.67A or 20W. The converter also lists 3KVAC isolation and compliance with EN50155 railway standards.

Can the RSDW20UW-12 be used in compact 12V rail or transit electronics?

It is suited to compact 12V loads because it provides up to 1.67A in a 50.8 × 25.4 × 10.2 mm package. The stated railway compliance and -40°C to +95°C operating range are also relevant for transit equipment designs.

What kind of environment can the RSDW20UW-12 handle?

Its specified operating temperature range is -40°C to +95°C, so it is intended for demanding temperature conditions within that band. Because no IP rating is given, environmental sealing is not defined by the listed specs and should come from the enclosure.

What is the difference between the RSDW20UW-12 and its sibling models?

Within the RSDW20UW series, all three models are rated 20W with 8.5~160VDC input, 50.8 × 25.4 × 10.2 mm dimensions, 35g weight, and -40°C to +95°C operation. The output options are 5V at 4A for the -05, 12V at 1.67A for the -12, and 15V at 1.33A for the -15.

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Model	Power	Voltage	Current	IP Rating
Mean Well RSDW20UW-15 Ultra-wide input DC/DC LED Driver 20W 15V - Heavy Duty 1.33A	20W	15V	1.33A	IP20	View
Mean Well RSDW20UW-05 Ultra-wide input DC/DC LED Driver 20W 5V - Heavy Duty 4A	20W	5V	4A	IP20	View

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