Isolated DC-DC Converter 350W Multi-Voltage Instrumentation

Product Overview

The SMUN SD-350 series 350W Isolated DC-DC Converter is a rugged, industrial-grade isolated power solution purpose-built for precision instrumentation and demanding DC power distribution applications. This Multi-Voltage DC-DC Power Supply supports three wide input voltage ranges (19-36VDC, 36-72VDC, 72-144VDC) and standard 5V/12V/24V/48V outputs, delivering up to 350.4W of stable rated power. With reinforced input-to-output isolation, low ripple noise, and exceptional environmental tolerance, this Industrial Isolated DC-DC Converter guarantees consistent power delivery for mission-critical systems, making it the preferred choice for our business partners seeking reliable, long-term power performance.

Technical Parameters

Model

SD-350B

SD-350C

SD-350D

Output

DC voltage

5V

12V

24V

48V

5V

12V

24V

48V

5V

12V

24V

48V

Rated current

57A

27.5A

14.6A

7.3A

60A

27.5A

14.6A

7.3A

60A

29.2A

14.6A

7.3A

Current range

0-57A

0-27.5A

0-14.6A

0-7.3A

0-60A

0-27.5A

0-14.6A

0-7.3A

0-60A

0-29.2A

0-14.6A

0-7.3A

Rated power

285W

330W

350.4W

350.4W

300W

330W

350.4W

350.4W

300W

350.4W

350.4W

350.4W

Voltage ADJ.range

4.5-5.5VDC

11-16VDC

23-30VDC

43-53VDC

4.5-5.5VDC

11-16VDC

23-30VDC

43-53VDC

4.5-5.5VDC

11-16VDC

23-30VDC

43-53VDC

Ripple&noise

100mVp-p

120mVp-p

150mVp-p

200mVp-p

100mVp-p

120mVp-p

150mVp-p

200mVp-p

100mVp-p

120mVp-p

150mVp-p

200mVp-p

Voltage tolerance

±2.0%

±1.0%

±1.0%

±1.0%

±2.0%

±1.0%

±1.0%

±1.0%

±2.0%

±1.0%

±1.0%

±1.0%

Line regulation

±0.5%

±0.5%

±0.5%

±0.5%

±0.5%

±0.5%

±0.5%

±0.5%

±0.5%

±0.5%

±0.5%

±0.5%

Load regulation

±1.0%

±1.0%

±1.0%

±1.0%

±1.0%

±1.0%

±1.0%

±1.0%

±1.0%

±1.0%

±1.0%

±1.0%

Set up,rise time

300ms,50ms,at full load

Hold up time（Typ.)

30ms(only D mode) at full load

Input

Voltage range

B:19-36VDC       C:36-72VDC      D:72-144VDC

Efficiency

74%

80%

80%

84%

76%

81%

81%

82%

78%

83%

87%

89%

DC current

14.4A/24V

16A/24V

17.6A/24V

17.6A/24V

7.6A/48V

8.8A/48V

9.0A/48V

9.0A/48V

6A/96V

6A/96V

6A/96V

6A/96V

Protection

Overload

Rated output power 105%~135%

Protection type:shut down o/p voltage,auto-recovery after fault condition is removed

Over voltage

5.75 ~ 6.75V

16.8 ~ 20V

31.5 ~ 37.5V

53 ~ 65V

5.75 ~ 6.75V

16.8 ~ 20V

31.5 ~ 37.5V

53 ~ 65V

5.75 ~ 6.75V

16.8 ~ 20V

31.5 ~ 37.5V

53 ~ 65V

Protection type:shut down o/p voltage,auto-recovery after fault condition is removed

Over temperature

Shut down output voltage,auto receivery after temperature low down

Environment

Working temperature

-10℃～+60℃

Working humidity

20-90%RH

Storage temp,humidity

-20~+85℃，20%-90%RH

Temp.coefficient

±0.03%℃(0-50℃)

Vibration

10 ~ 500Hz, 2G 12min./1cycle, period for 60min. each along X, Y, Z axes

Safety & EMC

Safety standards

Compliance to:CE and GB4943.1 EN 60950.1 safety standards

Withstand voltage

I/P-O/P:1.5KVAC I/P-FG:1.5KVAC  O/P-PG:0.5KVAC

Isolation resistance

I/P-O/P, I/P-FG, O/P-FG:100M Ohms / 500VDC / 25℃/ 70% RH

EMC emission

BS EN/EN55032 (CISPR32) Class B,EAC TP TC 020

EMC immunity

BS EN/EN61000-4-2,3,4,5,6,8,A Class,EAC TP TC 020

Others

MTBF

1919.7K hrs min. Telcordia SR-332 (Bellcore) ; 280.6K hrs min. MIL-HDBK-217F (25℃)

Size

215*115*50mm (L*W*H)

Packing

1.1Kg; 12pcs/14.4Kg/0.9CUFT

Core Advantages for Our Business Partners

Reinforced Isolation & Ultra-Long Service Life

This SD-350 DC-DC Converter features a reinforced isolation design with 1.5KVAC input-output withstand voltage, delivering a minimum MTBF of 1919.7K hours (Telcordia SR-332 standard), drastically cutting equipment downtime and maintenance costs for our business partners.

Wide Voltage Adaptability & Flexible Tuning

With three broad input ranges and adjustable output voltage, the converter adapts to unstable DC bus voltages and diverse system needs, simplifying inventory management and reducing model replacement frequency for trade clients.

Comprehensive Fault Protection

Built-in overload (105%-135% rated power), over-voltage, and over-temperature protection, with auto-recovery after fault clearance, safeguards both the converter and connected loads, boosting overall system safety.

High Efficiency & Low Thermal Loss

Peak efficiency reaches 89%, minimizing power loss and heat generation, supporting long-term full-load operation, and helping industrial clients optimize system energy consumption.

Target Industries & Applications

This Isolated DC-DC Converter is widely used in industrial automation & precision instrumentation, telecommunications & datacom infrastructure, renewable energy & DC power distribution, and rail transit & on-board power systems, delivering stable isolated power for high-interference, harsh operating environments.

Quality Assurance & Compliance

All units are manufactured under a strict ISO quality management system, with 100% full-load aging testing prior to delivery. Products comply with CE, GB4943.1, EN 60950.1 safety standards, meet EN55032 (CISPR32) Class B EMC emission requirements, and pass EN61000-4 series immunity tests, fully meeting global market access regulations.

Packaging, Shipping & Order Terms

Packaging: Single unit net weight 1.1Kg; 12 units per anti-static, shock-proof industrial carton, gross weight 14.4Kg, volume 0.9CUFT.

Shipping: Global express, air freight, and sea freight options, with tailored logistics for sample and bulk orders.

Order Terms: MOQ starts at 1 unit, sample orders accepted; tiered pricing for bulk purchases; custom parameter adjustments available for project-specific demands.

FAQ

What isolation performance does the SD-350 Isolated DC-DC Converter offer?

It delivers 1.5KVAC input-output isolation withstand voltage, with 100M Ohms isolation resistance at 500VDC, effectively suppressing electrical interference for safe operation in complex industrial environments.

Can the output voltage of the converter be adjusted?

Yes, all models support adjustable output within the specified range (e.g., 23-30VDC for 24V output models) to match diverse system voltage requirements.

Get Your Custom Quotation

For bulk order inquiries, custom parameter design, or full-project power solution support, contact our technical sales team today. We provide tailored solutions, fast sample delivery, and competitive exclusive pricing for our business partners worldwide.

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