PSR-28024 Equivalent & Substitute Parts Reference

Part Overview

The PSR-28024 is a surface mount board fuse manufactured by Littelfuse Inc., rated for 8 A at 32 V DC with slow blow response characteristics. This component is classified as obsolete, necessitating identification of active equivalent parts for new designs and ongoing production requirements. The PSR-28024 is packaged in 0603 (1608 Metric) form factor and is suitable for direct board-level integration in electronic assemblies requiring overcurrent protection.

Key Parameters

Parameter	Value
Current Rating	8 A
Voltage Rating (DC)	32 V
Fuse Type	Board Mount (Cartridge Style Excluded)
Mounting Type	Surface Mount
Package / Case	0603 (1608 Metric)
Response Time	Slow Blow
Breaking Capacity @ Rated Voltage	80 A
Melting I²t	7
DC Cold Resistance	0.006 Ohms
Operating Temperature Range	-55°C ~ 125°C
Size / Dimension	0.063" L x 0.031" W x 0.031" H (1.60mm x 0.80mm x 0.80mm)

Substitute Part Grouping Explanation

Substitution of the PSR-28024 is determined by strict equivalence across the following electrical and mechanical parameters:

Current Rating: 8 A (exact match required)
Voltage Rating (DC): 32 V (exact match required)
Response Time: Slow Blow (exact match required)
Package / Case: 0603 (1608 Metric) (exact match required)
Fuse Type: Board Mount (Cartridge Style Excluded) (exact match required)
Mounting Type: Surface Mount (exact match required)
Breaking Capacity @ Rated Voltage: 80 A (exact match required)
Melting I²t: 7 (exact match required)
DC Cold Resistance: 0.006 Ohms (exact match required)

The SF-0603SP800M-2 manufactured by Bourns Inc. meets all electrical and mechanical equivalence criteria and is classified as an active product, making it suitable for direct substitution in applications currently using the obsolete PSR-28024.

Parameter Comparison

Parameter	PSR-28024 (Littelfuse)	SF-0603SP800M-2 (Bourns)	Match Status
Current Rating (Amps)	8 A	8 A	Equivalent
Voltage Rating - DC	32 V	32 V	Equivalent
Response Time	Slow Blow	Slow Blow	Equivalent
Package / Case	0603 (1608 Metric)	0603 (1608 Metric)	Equivalent
Fuse Type	Board Mount (Cartridge Style Excluded)	Board Mount (Cartridge Style Excluded)	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
Breaking Capacity @ Rated Voltage	80 A	80 A	Equivalent
Melting I²t	7	7	Equivalent
DC Cold Resistance	0.006 Ohms	0.006 Ohms	Equivalent
Operating Temperature Range	-55°C ~ 125°C	-55°C ~ 150°C	SF-0603SP800M-2 has extended upper limit
Size / Dimension	0.063" L x 0.031" W x 0.031" H (1.60mm x 0.80mm x 0.80mm)	0.063" L x 0.031" W x 0.031" H (1.60mm x 0.80mm x 0.80mm)	Equivalent
Product Status	Obsolete	Active	SF-0603SP800M-2 is currently manufactured

Engineering Selection Recommendations

The SF-0603SP800M-2 is the direct equivalent substitute for the obsolete PSR-28024. Selection of this part is based on the following engineering criteria:

Electrical Equivalence: All critical electrical parameters including current rating, voltage rating, response time, breaking capacity, melting I²t, and DC cold resistance are identical between the two parts.

Mechanical Compatibility: Both parts share identical package dimensions (0603 / 1608 Metric) and surface mount mounting type, ensuring direct board-level compatibility without PCB redesign.

Product Status: The SF-0603SP800M-2 is classified as active and currently manufactured by Bourns Inc., ensuring long-term availability and supply chain continuity.

Compliance and Certifications: The SF-0603SP800M-2 carries RoHS3 compliance and REACH unaffected status, meeting current regulatory requirements for electronic component procurement.

Operating Temperature: The SF-0603SP800M-2 extends the upper operating temperature limit to 150°C compared to the PSR-28024 at 125°C, providing additional thermal margin in applications subject to elevated ambient or self-heating conditions.

Frequently Asked Questions (FAQ)

Q: Can the SF-0603SP800M-2 be used as a direct replacement for the PSR-28024 without PCB modifications?

A: Yes. Both parts are identical in package dimensions (0603 / 1608 Metric), mounting type (surface mount), and all electrical parameters. Direct substitution on existing PCBs is possible without layout changes.

Q: What is the primary reason for substituting the PSR-28024?

A: The PSR-28024 is classified as obsolete. The SF-0603SP800M-2 is an active product currently manufactured by Bourns Inc., ensuring availability for new production and design continuity.

Q: Are there any electrical performance differences between these two fuses?

A: No. Both parts are electrically equivalent across all specified parameters: 8 A current rating, 32 V DC voltage rating, slow blow response, 80 A breaking capacity, 7 melting I²t, and 0.006 Ohms DC cold resistance.

Q: Does the SF-0603SP800M-2 have different packaging options?

A: The SF-0603SP800M-2 is supplied in Tape & Reel (TR) packaging. Verify packaging requirements for your procurement process.

Q: What is the operating temperature difference between these parts?

A: The PSR-28024 operates from -55°C to 125°C. The SF-0603SP800M-2 operates from -55°C to 150°C, providing a 25°C extended upper temperature range.

Q: Are both parts RoHS compliant?

A: The SF-0603SP800M-2 is RoHS3 compliant. Compliance information for the obsolete PSR-28024 is not provided in the reference data.

Q: What is the Moisture Sensitivity Level (MSL) of the SF-0603SP800M-2?

A: The SF-0603SP800M-2 has MSL 1 (Unlimited), indicating no moisture sensitivity restrictions for storage or handling.

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