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Mean Well RDDW08G-12 DC-DC Converter - 8W - 18~75V in ±12V out 333mA
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RDDW08G-12 is the ±12V output model of this series: rated power 8W, typical efficiency 86%.
RSDW08 and RDDW08 series are 8W module type DC-DC reliable railway converter with DIP24 package. It features inter-national standard pins, a high efficiency up to 86%, wide working temperature range -40~+85℃, 1.5KVDC I/P-O/P isolation voltage, compliance with EN50155 railway standard, continuous-mode short circuit protection, etc. The models account for different input voltage 9~36V and 18~75V 4:1 wide input range, and various output voltage, 3.3V/5V/12V/15V for single output and ±5V/±12V/±15V 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 EN50155 railway standard
- DIP 24 package with standard pinout
- 4:1 wide input range
- Wide operating temperature range -40 ~ +85℃
- No minimum load required
- Full encapsulated
- Protections: Short circuit (Continuous) / Overload / Over voltage / Input under voltage
- 1.5KVDC I/O isolation
- Remote ON/OFF control
- 3 years warranty
Specifications
INPUT
- INPUT VOLTAGE (RANGE)
- Normal 48V (18 ~ 75V)
- INPUT CURRENT NO LOAD
- 10mA
- INPUT CURRENT FULL LOAD
- 194mA
- VOLTAGE RANGE
- 18~75Vdc
- SURGE VOLTAGE (100ms max.)
- 24Vin models : 50Vdc, 48Vin models : 100Vdc
- FILTER
- Pi type
- PROTECTION (Typ.)
- Fuse recommended. 24Vin models: 3A delay time Type, 48Vin models: 1.5A delay time Type
- INTERNAL POWER DISSIPATION
- 500mW
OUTPUT
- OUTPUT VOLTAGE
- ±12V
- OUTPUT CURRENT
- ±0 ~ 333mA
- EFFICIENCY (Typ.)
- 86%
- CAPACITOR LOAD (MAX.)
- 333μF (each output)
- VOLTAGE ACCURACY
- ±1.5%
- RATED POWER
- 8W
- RIPPLE & NOISENote.2
- 50mVp-p
- LINE REGULATIONNote.3
- ±0.5%
- LOAD REGULATIONNote.4
- Single output models: ±0.5%, Dual output models:±1%
- CROSS REGULATION
- ±5% @ 25%~100% load
- SWITCHING FREQUENCY (min.)
- 100KHz
PROTECTION
- SHORT CIRCUIT
- Protection type : Continuous, automatic recovery
- OVERLOAD
- 120 ~ 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
- 24Vin: 8.8Vdc, 48Vin: 17Vdc
- UNDER VOLTAGE LOCKOUT Shutdown voltage
- 24Vin: 8Vdc, 48Vin: 16Vdc
FUNCTION
- REMOTE CONTROL
- Power ON: R.C. ~ -Vin >3.5~36Vdc or open circuit ; Power OFF: R.C. ~ -Vin <1.2Vdc or short
ENVIRONMENT
- COOLING
- Free-air convection
- WORKING TEMP.
- -40 ~ +85℃ (Refer to "Derating Curve")
- CASE TEMPERATURE
- +100℃ max.
- WORKING HUMIDITY
- 20% ~ 90% RH non-condensing
- STORAGE TEMP., HUMIDITY
- -55 ~ +125℃, 10 ~ 95% RH non-condensing
- TEMP. COEFFICIENT
- 0.03% / ℃ (0 ~ 71℃)
- 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; Mounting: compliance to EN61373(Category 1- Class B)
SAFETY & EMC ( Note.5)
- SAFETY STANDARDS
- EAC TP TC 020/2011(EAC TP TC 004 for 48Vin type only) approved
- WITHSTAND VOLTAGE
- I/P-O/P:1.5KVDC
- ISOLATION RESISTANCE
- I/P-O/P:100M Ohms / 500VDC / 25℃/ 70% RH
- ISOLATION CAPACITANCE (Typ.)
- 1000pF
- EMC EMISSION
-
Parameter Standard Test Level Conducted BS EN/EN55032 Class A/B with external components Radiated BS EN/EN55032 N/A - EMC IMMUNITY
-
Parameter Standard Test Level ESD BS EN/EN61000-4-2 Level 2, ±8KV air, ±4KV contact Radiated Susceptibility BS EN/EN61000-4-3 Level 2, 3V/m EFT/Bursts BS EN/EN61000-4-4 Level 1, 0.5KV Surge BS EN/EN61000-4-5 Level 1, 0.5KV Line-Line Conducted BS EN/EN61000-4-6 Level 2, 3V(e.m.f.) - RAILWAY STANDARD
- EN50155 including EN61373 for shock & vibration, EN50121-3-2 for EMC
OTHERS
- MTBF
- Single: 1500Khrs, Dual: 1300Khrs MIL-HDBK-217F(25℃)
- DIMENSION (L*W*H)
- 31.8*20.3*10.2mm (1.25*0.8*0.4 inch)
- CASE MATERIAL
- Black coated copper with non-conductive base
- PACKING
- 18.4g ; 10pcs/per tube, 700pcs/70 tube/per carton
Test conditions and notes5
- 1.All parameters are specified at normal input(F:24Vdc, G:48Vdc), 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 10% to 100% rated load.
- 5.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
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
Certificates3
Test reports1
FAQ
Can I use the RDDW08G-12 for industrial signal-conditioning or analog interface boards?
It can fit industrial signal-conditioning or analog interface designs that need a dual output and stay within the unit's 8W rating. This model provides ±12V output from an 18-75VDC input range in a constant-voltage design. Its miniature 31.8 × 20.3 × 10.2 mm package can also help in space-limited control hardware.
Is the RDDW08G-12 suitable for embedded control electronics that need split rails?
Yes, it is suited to embedded electronics that require a regulated ±12V rail and fit inside an 8W power budget. The converter is compact at 31.8 × 20.3 × 10.2 mm and weighs 0.0184 kg, which supports dense embedded assemblies. The listed dual-output feature is relevant for split-rail circuit designs.
Can this converter be used inside automation equipment with wide input variation?
It is designed for applications that need constant-voltage output across an 18-75VDC input range. That makes it a fit for automation equipment where the available source falls within that span and the load requires ±12V output. The converter is rated at 8W, so the connected circuitry needs to stay within that limit.
Is the RDDW08G-12 appropriate for harsh indoor industrial environments?
The operating temperature range is -40°C to +85°C, and the features list includes 2G vibration resistance plus 85°C operation. That supports use in demanding indoor industrial conditions where temperature swing and vibration matter. No IP rating is listed in the provided specs, so outdoor or washdown suitability is not established from these specs alone.
How does the RDDW08G-12 compare with the other RDDW08G models?
Within the RDDW08G family, all listed models are 8W units. The RDDW08G-05 is ±5V with ±800mA output current, the RDDW08G-12 is ±12V with ±333mA output current, and the RDDW08G-15 is ±15V with ±265mA output current. The provided dimensions for this model are 31.8 × 20.3 × 10.2 mm.
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