ISW2405A Equivalent & Substitute Parts

Part Overview

The ISW2405A is an isolated module DC-DC converter manufactured by XP Power, designed to convert 22.8V to 25.2V input voltage to a regulated 5V output at 200mA maximum current. This 1W converter is classified as obsolete, necessitating identification of functionally equivalent active alternatives for new designs and ongoing production requirements. The part is surface-mounted in a 10-SMD module package with 1.5kV isolation suitable for commercial ITE applications.

Key Parameters

Parameter	Value
Input Voltage Range	22.8V – 25.2V
Output Voltage	5V
Output Current (Max)	200mA
Power Rating	1W
Isolation Voltage	1.5kV
Number of Outputs	1
Mounting Type	Surface Mount
Operating Temperature Range	-40°C to 85°C
Package Type	SMD Module
Isolation Standard	1.5kV

Substitute Part Grouping Explanation

Substitution of the ISW2405A is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

Single isolated output at 5V nominal voltage
Output current capability of 200mA minimum
1.5kV isolation voltage
1W power rating
Surface-mount package configuration
Input voltage range compatibility with 24V nominal bus systems

Allowable Variation Parameters:

Input voltage range may extend beyond the original specification provided the minimum and maximum bounds encompass the ISW2405A range (22.8V – 25.2V)
Operating temperature range may exceed the original specification
Efficiency may differ
Package footprint dimensions may vary within surface-mount constraints
Lead count and SMD configuration may differ

The PDS1-S24-S5-M-TR from CUI Inc. satisfies all mandatory matching parameters and qualifies as a direct substitute.

Parameter Comparison

Parameter	ISW2405A (XP Power)	PDS1-S24-S5-M-TR (CUI Inc.)	Compatibility
Input Voltage (Min)	22.8V	21.6V	CUI range encompasses XP Power specification
Input Voltage (Max)	25.2V	26.4V	CUI range encompasses XP Power specification
Output Voltage	5V	5V	Identical
Output Current (Max)	200mA	200mA	Identical
Power Rating	1W	1W	Identical
Isolation Voltage	1.5kV	1.5kV	Identical
Number of Outputs	1	1	Identical
Mounting Type	Surface Mount	Surface Mount	Identical
Operating Temperature Range	-40°C to 85°C	-40°C to 105°C	CUI range exceeds XP Power specification
Efficiency	73%	80%	CUI provides higher efficiency
Package Configuration	10-SMD Module, 6 Leads	8-SMD Module, 5 Leads	Different footprints; PCB layout verification required
Dimensions	15.2mm × 11.2mm × 6.5mm	12.7mm × 8.3mm × 7.3mm	CUI is smaller; space-constrained applications benefit
RoHS Status	ROHS3 Compliant	RoHS Compliant	Both compliant
Product Status	Obsolete	Active	CUI part actively manufactured and supported

Engineering Selection Recommendations

Primary Substitute: PDS1-S24-S5-M-TR (CUI Inc.)

The PDS1-S24-S5-M-TR is the qualified substitute for the obsolete ISW2405A based on the following engineering criteria:

Functional Equivalence: All mandatory electrical parameters match or exceed the ISW2405A specification. Input voltage range, output voltage, current capacity, power rating, and isolation voltage are identical or superior.
Product Status: The PDS1-S24-S5-M-TR is an active product with current manufacturing support, ensuring long-term availability and supply chain continuity.
Compliance: Both parts maintain RoHS compliance. The CUI part holds additional certifications (EN, UL standards 55024, 55032 Class A, 60950-1) providing enhanced regulatory documentation.
Thermal Performance: The CUI part operates to 105°C with derating, exceeding the XP Power specification of 85°C maximum.
Efficiency Improvement: The CUI substitute provides 80% efficiency compared to 73% for the original part, reducing thermal load in system designs.
Physical Considerations: The PDS1-S24-S5-M-TR occupies a smaller footprint (12.7mm × 8.3mm × 7.3mm versus 15.2mm × 11.2mm × 6.5mm) and uses a different lead configuration (5 leads, 8-SMD versus 6 leads, 10-SMD). PCB layout and schematic verification is required to confirm pin compatibility and signal routing.

Frequently Asked Questions (FAQ)

Q: Can the PDS1-S24-S5-M-TR directly replace the ISW2405A without PCB modification?

A: Electrical substitution is valid. However, the PDS1-S24-S5-M-TR uses a different package footprint (8-SMD, 5 leads versus 10-SMD, 6 leads) and smaller dimensions. PCB layout modification is required. Pin-to-pin signal mapping must be verified against both datasheets before implementation.

Q: What is the input voltage compatibility between these parts?

A: The ISW2405A accepts 22.8V to 25.2V input. The PDS1-S24-S5-M-TR accepts 21.6V to 26.4V input. The CUI part's wider input range fully encompasses the XP Power specification, ensuring compatibility in 24V nominal bus applications.

Q: Are there differences in isolation performance?

A: Both parts provide 1.5kV isolation voltage. Isolation performance is equivalent for applications requiring this specification level.

Q: How does the temperature operating range affect selection?

A: The ISW2405A operates -40°C to 85°C. The PDS1-S24-S5-M-TR operates -40°C to 105°C with derating. For applications operating above 85°C, the CUI part provides extended thermal capability. For applications within the original -40°C to 85°C range, both parts are suitable.

Q: What is the impact of the efficiency difference?

A: The PDS1-S24-S5-M-TR operates at 80% efficiency versus 73% for the ISW2405A. This 7% improvement reduces power dissipation and thermal management requirements in the system design.

Q: Are there packaging or supply chain advantages?

A: The PDS1-S24-S5-M-TR is available in Cut Tape and Digi-Reel packaging with 2299 pieces in current inventory. The ISW2405A is obsolete with 778 pieces remaining. The CUI part ensures long-term supply availability.

Q: What certifications apply to the substitute part?

A: The PDS1-S24-S5-M-TR holds EN, UL certifications and complies with standards 55024, 55032 Class A, and 60950-1. Both parts are RoHS compliant and carry EAR99 ECCN classification.

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