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Mean Well

Mean Well SD-350B-12 DC-DC Converter - 330W - 19~36V in 12V out 27.5A

2:1 wide input range1.5~2KVAC isolation by models
SKU SD-350B-12
$110.13 USD
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Overview

SD-350B-12 is the 12V output model of this series: rated current 27.5A, rated power 330W, typical efficiency 80%.

Features

  • 2:1 wide input range
  • Protections: Short circuit / Overload / Over voltage / Over temperature
  • 1500VAC I/O isolation
  • Forced air cooling by built-in DC Fan
  • 100% full load burn-in test
  • 24V and 48V input voltage design refer to LVD
  • 2 years warranty

Specifications

SD-350B-12Specifications from the official datasheet (2024-11-22 edition)

OUTPUT

DC VOLTAGE
12V
RATED CURRENT
27.5A
CURRENT RANGE
0 ~ 27.5A
RATED POWER
330W
RIPPLE & NOISE (max.)Note.2
120mVp-p
VOLTAGE ADJ. RANGE
11 ~ 16VDC
VOLTAGE TOLERANCENote.3
±1.0%
LINE REGULATION
±0.3%
LOAD REGULATION
±1.0%
SETUP, RISE TIME
300ms, 50ms at full load

INPUT

VOLTAGE RANGE
20 ~ 36VDC
EFFICIENCY (Typ.)
80%
DC CURRENT (Typ.)
16A/24V
INRUSH CURRENT (Typ.)
C:45A/48VDC D:45A/96VDC

PROTECTION

OVERLOAD
105 ~ 135% rated output power Protection type : Shut down o/p voltage, re-power on to recover
OVER VOLTAGE
16.8 ~ 20V Protection type : Shut down o/p voltage, re-power on to recover
OVER TEMPERATURE
Shut down o/p voltage, recovers automatically after temperature goes down

ENVIRONMENT

WORKING TEMP.
-20 ~ +60℃ (Refer to "Derating Curve")
WORKING HUMIDITY
20 ~ 90% RH non-condensing
STORAGE TEMP., HUMIDITY
-40 ~ +85℃, 10 ~ 95% RH
TEMP. COEFFICIENT
±0.03%/℃ (0 ~ 50℃)
VIBRATION
10 ~ 500Hz, 2G 10min./1cycle, 60min. each along X, Y, Z axes

SAFETY & EMC (Note 4)

SAFETY STANDARDS
EAC TP TC 004 approved, design refer to AS/NZS 62368.1
WITHSTAND VOLTAGE
I/P-O/P:1.5KVAC I/P-FG:2KVAC O/P-FG:0.5KVAC
ISOLATION RESISTANCE
I/P-O/P, I/P-FG, O/P-FG:100M Ohms / 500VDC / 25℃/ 70% RH
EMC EMISSION
Compliance to BS EN/EN55032 (CISPR32) Class B, EAC TP TC 020
EMC IMMUNITY
Compliance to BS EN/EN61000-4-2,3,4,6,8, BS EN/EN55035, light industry level, EAC TP TC 020

OTHERS

MTBF
1705.6K hrs min. Telcordia SR-332 (Bellcore) ; 263.9K hrs min. MIL-HDBK-217F (25℃)
DIMENSION
215*115*50mm (L*W*H)
PACKING
1.1Kg; 12pcs/14.4Kg/0.9CUFT
Test conditions and notes5
  1. 1. All parameters NOT specially mentioned are measured at 24,48,96VDC input, rated load and 25℃ of ambient temperature.
  2. 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. 3. Tolerance : includes set up tolerance, line regulation and load regulation.
  4. 4. The power supply is considered a component which will be installed into a final equipment. All the EMC tests are been executed by mounting the unit on a 360mm*360mm metal plate with 1mm of thickness. The final equipment must be re-confirmed that it still meets 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 )
  5. 5. 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

SD-350B-12 Mechanical Specification
Mechanical Specification
SD-350B-12 Block Diagram
Block Diagram
SD-350B-12 Derating Curve
Derating Curve

Downloads

FAQ

Can I use the SD-350B-12 to run a 12V industrial control panel from a 20-36V source?

Yes, this model is a constant-voltage DC-DC converter with a 12V output and a 20-36V input range. Its 330W rating and 27.5A output make it suitable for 12V control loads in mobile, industrial, or automation systems that need a regulated 12V rail.

Is the SD-350B-12 a fit for 12V embedded computers or edge devices in a vehicle or battery-backed system?

It can be a fit when the upstream source is within 20-36V and the load requires a steady 12V supply. With up to 27.5A available and 1.5KVAC input-output isolation, it suits higher-current 12V embedded or industrial electronics.

Can I use this converter for 12V automation accessories such as relays, sensors, and controller modules?

Yes, if the system needs a constant 12V output from a 20-36V input bus, this model matches that requirement. The 330W capacity gives headroom for multiple 12V automation loads as long as the combined demand stays within 27.5A.

Is the SD-350B-12 suitable for outdoor or harsh-environment use?

The provided specs list an operating temperature range of -20°C to +60°C, but no IP rating is given. That means temperature capability is defined, while indoor or outdoor enclosure suitability is not established from the listed data alone.

How does the SD-350B-12 compare with the other SD-350B output versions?

Within the SD-350B group, the 5V model is 285W at 5V and 57A, this 12V model is 330W at 12V and 27.5A, the 24V model is 350.4W at 24V and 14.6A, and the 48V model is 350.4W at 48V and 7.3A. All are constant-voltage converters in the same series, but the output voltage, wattage, and available current differ by model.

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Mean Well SD-350B-12 DC-DC Converter - 330W - 19~36V in 12V out 27.5A
Mean Well

Mean Well SD-350B-12 DC-DC Converter - 330W - 19~36V in 12V out 27.5A

$110.13 USD

SD-350B-12 is the 12V output model of this series: rated current 27.5A, rated power 330W, typical efficiency 80%.

Features

  • 2:1 wide input range
  • Protections: Short circuit / Overload / Over voltage / Over temperature
  • 1500VAC I/O isolation
  • Forced air cooling by built-in DC Fan
  • 100% full load burn-in test
  • 24V and 48V input voltage design refer to LVD
  • 2 years warranty
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