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Mean Well

Mean Well SD-25B-24 DC-DC Converter - 25W - 19~36V in 24V out 1.1A

2:1 wide input range1.5~2KVAC isolation by models
SKU SD-25B-24
$27.72 USD
Shipping calculated at checkout.
In stock
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Overview

SD-25B-24 is the 24V output model of this series: rated current 1.1A, rated power 26.4W, typical efficiency 78%.

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-24Specifications from the official datasheet (2025-04-27 edition)

OUTPUT

DC VOLTAGE
24V
RATED CURRENT
1.1A
CURRENT RANGE
0 ~ 1.1A
RATED POWER
26.4W
RIPPLE & NOISE (max.)Note.2
150mVp-p
VOLTAGE ADJ. RANGE
23 ~ 30VDC
VOLTAGE TOLERANCENote.3
±1.0%
LINE REGULATION
±0.2%
LOAD REGULATION
±0.2%
SETUP, RISE, HOLD UP TIME
2.5s, 50ms, ------ at full load

INPUT

VOLTAGE RANGE
B:19 ~ 36VDC
EFFICIENCY (Typ.)
78%
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
31.5 ~ 37.5V/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-24 Mechanical Specification
Mechanical Specification
SD-25B-24 Block Diagram
Block Diagram
SD-25B-24 Derating Curve
Derating Curve

Downloads

FAQ

Can I use the SD-25B-24 to power a small 24V PLC or control module?

It can fit small 24V control electronics that stay within the 24V, 1.1A, and 26.4W output rating. That makes it more appropriate for low-power PLC logic, compact controllers, or light automation loads than for larger 24V devices.

Is the SD-25B-24 suitable for 24V sensors, relays, and interface devices in an automation panel?

Yes, it is intended for constant-voltage 24V output and can support loads up to 1.1A with 26.4W available. It is a better fit for smaller 24V interface devices and relay or sensor circuits than for higher-current 24V equipment.

Can this converter be used in a vehicle or mobile equipment system with a 19-36V source?

It is designed for applications where the input stays within the 19-36V range and the load needs 24V constant voltage output. With 26.4W maximum output power, it suits lower-power embedded or control loads rather than larger 24V accessories.

How does the SD-25B-24 compare with the other SD-25B models?

Within the SD-25B group, the output options are SD-25B-5 at 25W, 5V, 5A; SD-25B-12 at 25.2W, 12V, 2.1A; and SD-25B-24 at 26.4W, 24V, 1.1A. All use the same 19-36V input range and share the same compact series class.

Is the SD-25B-24 suitable for outdoor or harsh-environment use?

No IP rating is listed in the provided specs, so this model should not be treated as an outdoor or washdown unit based on the available data. The stated operating temperature range is -10°C to +60°C, with output derating at higher temperatures per the derating curve, which supports controlled indoor equipment environments within that temperature window.

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Mean Well SD-25B-24 DC-DC Converter - 25W - 19~36V in 24V out 1.1A
Mean Well

Mean Well SD-25B-24 DC-DC Converter - 25W - 19~36V in 24V out 1.1A

$27.72 USD

SD-25B-24 is the 24V output model of this series: rated current 1.1A, rated power 26.4W, typical efficiency 78%.

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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