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Mean Well

Mean Well SD-25B-12 DC-DC Converter - 25W - 19~36V in 12V out 2.1A

2:1 wide input range1.5~2KVAC isolation by models
SKU SD-25B-12
$27.69 USD
Shipping calculated at checkout.
In stock
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Overview

SD-25B-12 is the 12V output model of this series: rated current 2.1A, rated power 25.2W, typical efficiency 75%.

Features

  • 2:1 wide input range
  • Protections: Short circuit / Overload / Over voltage
  • 1500VAC I/O isolation
  • Built-in EMI filter, low ripple noise
  • 100% full load burn-in test
  • Fixed switching frequency at 83KHz
  • Low cost
  • High reliability
  • 2 years warranty

Specifications

SD-25B-12Specifications from the official datasheet (2025-04-27 edition)

OUTPUT

DC VOLTAGE
12V
RATED CURRENT
2.1A
CURRENT RANGE
0 ~ 2.1A
RATED POWER
25.2W
RIPPLE & NOISE (max.)Note.2
120mVp-p
VOLTAGE ADJ. RANGE
11 ~ 16VDC
VOLTAGE TOLERANCENote.3
±1.0%
LINE REGULATION
±0.3%
LOAD REGULATION
±0.3%
SETUP, RISE, HOLD UP TIME
2.5s, 50ms, ------ at full load

INPUT

VOLTAGE RANGE
B:19 ~ 36VDC
EFFICIENCY (Typ.)
75%
DC CURRENT
1.6A/24V

PROTECTION

OVERLOAD
105 ~ 150% rated output power Protection type : Hiccup mode, recovers automatically after fault condition is removed
OVER VOLTAGE
16.8 ~ 20V/10% load Protection type : Hiccup mode, recovers automatically after fault condition is removed

ENVIRONMENT

WORKING TEMP.
-10 ~ +60℃ (Refer to "Derating Curve")
WORKING HUMIDITY
20 ~ 90% RH non-condensing
STORAGE TEMP., HUMIDITY
-20 ~ +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 LVD, 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,heavy industry level, EAC TP TC 020

OTHERS

MTBF
3682.6K hrs min. Telcordia SR-332 (Bellcore) ; 528.8K hrs min. MIL-HDBK-217F (25℃)
DIMENSION
99*97*36mm (L*W*H)
PACKING
0.38Kg; 45pcs/17.8Kg/0.94CUFT
Test conditions and notes5
  1. 1. All parameters NOT specially mentioned are measured at 12,24,48VDC 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-25B-12 Mechanical Specification
Mechanical Specification
SD-25B-12 Block Diagram
Block Diagram
SD-25B-12 Derating Curve
Derating Curve

Downloads

FAQ

Can I use the SD-25B-12 in a 24V or 36V industrial system that needs a 12V output rail?

It can fit that use case when the available input is within the listed 19-36VDC range and the 12V load stays within 2.1A and 25.2W. The output mode is constant voltage.

Is the SD-25B-12 suitable for a small 12V automation or control module?

Yes, for small 12V automation or control loads that require constant-voltage output up to 2.1A. Its rated output power is 25.2W.

Can this converter power a 12V embedded device from a higher input range?

It is designed for applications needing 12V output from a listed 19-36VDC input range. The connected 12V device must remain within 2.1A and 25.2W.

How does the SD-25B-12 compare with the other SD-25B models?

Within the SD-25B family, SD-25B-12 is 25.2W at 12V and 2.1A, SD-25B-24 is 26.4W at 24V and 1.1A, and SD-25B-5 is 25W at 5V and 5A. The listed differences are the output voltage, output current, and wattage by model.

Is the SD-25B-12 intended for indoor or outdoor environments?

The provided specs show an operating temperature range of -10°C to +60°C, with output derating at higher temperatures per the derating curve, but they do not include an IP rating. That means the temperature range is stated, while outdoor exposure protection is not.

Payment & Security

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Mean Well SD-25B-12 DC-DC Converter - 25W - 19~36V in 12V out 2.1A
Mean Well

Mean Well SD-25B-12 DC-DC Converter - 25W - 19~36V in 12V out 2.1A

$27.69 USD

SD-25B-12 is the 12V output model of this series: rated current 2.1A, rated power 25.2W, typical efficiency 75%.

Features

  • 2:1 wide input range
  • Protections: Short circuit / Overload / Over voltage
  • 1500VAC I/O isolation
  • Built-in EMI filter, low ripple noise
  • 100% full load burn-in test
  • Fixed switching frequency at 83KHz
  • Low cost
  • High reliability
  • 2 years warranty
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