FCD061125TP Surface Mount Board Fuse 1.25A 32VDC 0603

Part Overview

The FCD061125TP is a surface mount board fuse manufactured by Littelfuse Inc., rated for 1.25 A at 32 V DC with fast-blow response characteristics. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The fuse is packaged in 0603 (1608 Metric) form factor and is suitable for applications requiring overcurrent protection in compact PCB layouts.

Key Parameters

Parameter	FCD061125TP
Manufacturer	Littelfuse Inc.
Current Rating	1.25 A
Voltage Rating - DC	32 V
Package / Case	0603 (1608 Metric)
Mounting Type	Surface Mount
Response Time	Fast Blow
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Operating Temperature	-55°C ~ 125°C

Substitute Part Grouping Explanation

Substitution for the FCD061125TP is determined by the following critical parameters: current rating (1.25 A), package form factor (0603 / 1608 Metric), mounting type (surface mount), response time (fast blow), and fuse type (board mount, cartridge style excluded). The voltage rating must meet or exceed the 32 V DC requirement of the original part.

Three substitute parts meet these criteria:

04381.25WR (Littelfuse Inc., Series 438) – Maintains 1.25 A current rating and 0603 package. Voltage rating increased to 32 V AC / 63 V DC. Active product status with enhanced breaking capacity (50 A).

04671.25NR (Littelfuse Inc., Series 467) – Maintains 1.25 A current rating and 0603 package. Voltage rating increased to 32 V AC / 65 V DC. Active product status with manufacturer recommendation designation.

SF-0603F125-2 (Bourns Inc., SinglFuse™ SF-0603F Series) – Maintains 1.25 A current rating and 0603 package. Voltage rating matches original at 32 V DC. Active product status from alternative manufacturer.

Parameter Comparison

Parameter	FCD061125TP	04381.25WR	04671.25NR	SF-0603F125-2
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	Bourns Inc.
Current Rating (Amps)	1.25 A	1.25 A	1.25 A	1.25 A
Voltage Rating - DC	32 V	63 V	65 V	32 V
Package / Case	0603 (1608 Metric)	0603 (1608 Metric)	0603 (1608 Metric)	0603 (1608 Metric)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Response Time	Fast Blow	Fast Blow	Fast Blow	Fast Blow
Product Status	Obsolete	Active	Active	Active
Breaking Capacity @ Rated Voltage	35 A	50 A	35 A AC, 13 A DC	50 A
DC Cold Resistance	0.085 Ohms	0.2 Ohms	0.051 Ohms	0.063 Ohms
Operating Temperature	-55°C ~ 125°C	-55°C ~ 150°C	-55°C ~ 90°C	-20°C ~ 105°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	cULus	CSA, UL	CSA, UL	UL

Engineering Selection Recommendations

All three substitute parts are active products with current manufacturing status, eliminating obsolescence risk associated with the FCD061125TP.

04381.25WR is suitable for applications where increased DC voltage margin (63 V) is beneficial. This part offers the highest breaking capacity (50 A) and extended operating temperature range to 150°C. CSA and UL certifications provide dual regulatory compliance.

04671.25NR is designated as manufacturer-recommended and maintains the original 35 A breaking capacity. Operating temperature range is limited to -55°C ~ 90°C, which may restrict use in high-temperature environments. Breaking capacity at DC is reduced to 13 A.

SF-0603F125-2 from Bourns Inc. provides an alternative manufacturer source with identical voltage rating (32 V DC) and current rating (1.25 A) to the original part. This option offers 50 A breaking capacity and UL certification. Operating temperature range is -20°C ~ 105°C, narrower than the original specification at the low end.

Selection should be based on application voltage requirements, temperature operating range, and regulatory certification needs.

Frequently Asked Questions (FAQ)

Q: Can 04381.25WR be used as a direct replacement for FCD061125TP?

A: Yes. Both parts share identical current rating (1.25 A), package form factor (0603), mounting type (surface mount), and response time (fast blow). The 04381.25WR has higher voltage rating (63 V DC vs. 32 V DC), which is compatible with applications designed for 32 V DC operation.

Q: What is the difference between 04671.25NR and 04381.25WR?

A: Both are Littelfuse 1.25 A fuses in 0603 package. The 04671.25NR has slightly higher DC voltage rating (65 V vs. 63 V) but lower operating temperature maximum (90°C vs. 150°C) and reduced DC breaking capacity (13 A vs. 50 A). The 04381.25WR is preferred for high-temperature applications.

Q: Is SF-0603F125-2 from Bourns Inc. compatible with the original FCD061125TP?

A: Yes. The SF-0603F125-2 matches the original part's current rating (1.25 A), DC voltage rating (32 V), package (0603), and mounting type (surface mount). It is manufactured by a different supplier but meets equivalent electrical and mechanical specifications.

Q: Does the higher voltage rating of 04381.25WR or 04671.25NR affect circuit performance?

A: No. Fuse voltage rating indicates the maximum voltage the fuse can safely interrupt. A fuse rated for higher voltage operates identically in lower-voltage circuits. The 1.25 A current rating and fast-blow response remain unchanged.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All three substitute parts (04381.25WR, 04671.25NR, and SF-0603F125-2) are ROHS3 compliant, matching the original FCD061125TP specification.

Q: Which substitute part has the best availability?

A: SF-0603F125-2 has the highest inventory (30,448 pcs), followed by 04671.25NR (5,452 pcs) and 04381.25WR (2,199 pcs).

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message