SSTC 1 Equivalent & Substitute Parts

Part Overview

The SSTC 1 is a 1 A, 125 V AC/DC surface mount board mount fuse manufactured by Bel Fuse Inc. in a 2-SMD, Square End Block with Clip package configuration. This part is classified as Obsolete, requiring identification of active equivalent alternatives for new designs and ongoing production support. Substitute parts maintain identical electrical ratings and functional performance while offering improved availability and active product status.

Key Parameters

Parameter	Value
Current Rating	1 A
Voltage Rating (AC)	125 V
Voltage Rating (DC)	125 V
Response Time	Slow Blow
Fuse Type	Board Mount (Cartridge Style Excluded)
Mounting Type	Surface Mount
Package / Case	2-SMD, Square End Block
Operating Temperature Range	-55°C ~ 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following parameters:

Current Rating: 1 A (exact match required)
Voltage Rating: 125 V AC and 125 V DC (exact match required)
Response Time: Slow Blow (exact match required)
Fuse Type: Board Mount, Surface Mount (exact match required)
Package / Case: 2-SMD, Square End Block (exact match required)
Operating Temperature Range: -55°C ~ 125°C (exact match required)
RoHS Compliance: ROHS3 Compliant (exact match required)

All substitute parts listed below meet these criteria. Packaging format differences (Cut Tape vs. Tape & Reel) do not affect electrical or mechanical compatibility and represent supply chain variations only.

Parameter Comparison

Part Number	Manufacturer	Current Rating	Voltage AC/DC	Response Time	Breaking Capacity @ Rated Voltage	Melting I²t	DC Cold Resistance	Product Status	Packaging	Inventory
SSTC 1	Bel Fuse Inc.	1 A	125 V / 125 V	Slow Blow	50 A	1.2	0.17 Ω	Obsolete	Cut Tape (CT) & Digi-Reel®	903 Pcs
0680L1000-01	Bel Fuse	1 A	125 V / 125 V	Slow Blow	50 A AC, 100 A DC	1.5	0.175 Ω	Active	Tape & Reel (TR)	4364 Pcs
0680L1000-05	Bel Fuse Inc.	1 A	125 V / 125 V	Slow Blow	50 A AC, 100 A DC	1.5	0.175 Ω	Active	Tape & Reel (TR)	52236 Pcs
0680L1000-11	Bel Fuse Inc.	1 A	125 V / 125 V	Slow Blow	50 A AC, 100 A DC	1.5	0.175 Ω	Active	Tape & Reel (TR)	1077 Pcs
0680L1000-15	Bel Fuse	1 A	125 V / 125 V	Slow Blow	50 A AC, 100 A DC	1.5	0.175 Ω	Active	Tape & Reel (TR)	805 Pcs
0680L1000-21	Bel Fuse Inc.	1 A	125 V / 125 V	Slow Blow	50 A AC, 100 A DC	1.5	0.175 Ω	Active	Tape & Reel (TR)	710 Pcs
0680L1000-25	Bel Fuse Inc.	1 A	125 V / 125 V	Slow Blow	50 A AC, 100 A DC	1.5	0.175 Ω	Active	Tape & Reel (TR)	843 Pcs

Engineering Selection Recommendations

All substitute parts (0680L1000-01, 0680L1000-05, 0680L1000-11, 0680L1000-15, 0680L1000-21, 0680L1000-25) are classified as Active products with full manufacturing support. These parts carry AEC-Q200, CE, and cURus certifications, providing enhanced compliance coverage compared to the obsolete SSTC 1. All substitutes maintain ROHS3 compliance and REACH unaffected status.

The 0680L series parts demonstrate improved breaking capacity at rated voltage (50 A AC, 100 A DC versus 50 A for SSTC 1) and higher melting I²t values (1.5 versus 1.2), indicating enhanced performance margins. DC cold resistance remains within 0.175 Ω, functionally equivalent to the original 0.17 Ω specification.

Selection among substitute options should be based on packaging availability (Tape & Reel format) and inventory levels. All parts are electrically and mechanically interchangeable with the SSTC 1 within the specified operating temperature range of -55°C to 125°C.

Frequently Asked Questions (FAQ)

Q: Can 0680L1000 series parts directly replace SSTC 1 in existing designs?

A: Yes. All 0680L1000 variants meet the electrical and mechanical requirements of SSTC 1. Current rating (1 A), voltage ratings (125 V AC/DC), response time (Slow Blow), and package configuration (2-SMD, Square End Block) are identical. Packaging format differences (Tape & Reel versus Cut Tape) do not affect circuit performance.

Q: What is the significance of the different part number suffixes (-01, -05, -11, -15, -21, -25)?

A: The suffix designations represent different packaging or tape configurations within the 0680L1000 series. All variants maintain identical electrical specifications and are functionally equivalent. Selection should be based on supply chain requirements and available inventory.

Q: Are there compliance or certification differences between SSTC 1 and the substitute parts?

A: The 0680L1000 series carries AEC-Q200, CE, and cURus certifications, providing broader regulatory coverage than the obsolete SSTC 1. All parts maintain ROHS3 compliance and REACH unaffected status.

Q: What is the difference in melting I²t between SSTC 1 (1.2) and the 0680L series (1.5)?

A: The higher melting I²t value in the 0680L series indicates a slightly higher thermal energy threshold before fuse element melting occurs. This represents an improved performance margin and does not affect compatibility with SSTC 1 applications.

Q: Can I mix SSTC 1 and 0680L1000 parts in the same production batch?

A: Yes. All parts are electrically and mechanically equivalent and operate identically within the specified -55°C to 125°C temperature range. Mixing is acceptable from a functional standpoint; however, supply chain practices should determine batch consistency.

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