Part A
0154002.DR
Littelfuse Inc.
- Lifecycle
- Active
- Stock
- 7461 PCS
- Package
- 2-SMD
- Series
- Fuses
Replacement verdict
Compatible functional replacement candidate
The 0154003.DR and 0154002.DR are both fast-acting surface-mount fuses from the Littelfuse 154 series with identical voltage ratings, breaking capacity, and package footprint, making them strong functional replacement candidates. The primary distinction is the current rating, which requires careful validation against the target circuit's steady-state and inrush current profile before substitution.
Current Rating
Validation required
Voltage Rating
High match
Package Type
High match
Breaking Capacity
High match
Parts at a glance
Part B
0154003.DR
Littelfuse Inc.
- Lifecycle
- Active
- Stock
- 4029 PCS
- Package
- 2-SMD
- Series
- Fuses
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 0154003.DR | 0154002.DR | Why it matters |
|---|---|---|---|
| Current Rating | 3 A | 2 A | Determines the maximum continuous current the fuse can carry without opening; a direct functional difference affecting circuit protection sizing. |
| Voltage Rating (AC) | 250 V | 250 V | Specifies the maximum AC voltage the fuse can safely interrupt; must meet or exceed the circuit voltage. |
| Voltage Rating (DC) | 125 V | 125 V | Specifies the maximum DC voltage the fuse can safely interrupt; critical for DC applications. |
| Breaking Capacity | 100 A at 250 VAC | 100 A at 250 VAC | Indicates the maximum fault current the fuse can safely interrupt without damage or hazard. |
| I²t Melting Integral | 7.2 A²s | 3.2 A²s | Governs the energy required to open the fuse; affects coordination with inrush currents and downstream protection. |
| Nominal Melting Time at 2×In | Less than 5 s | Less than 5 s | Defines the time-current characteristic; ensures predictable opening under overload conditions. |
| Fuse Type | Time-Lag (Slow-Blow) | Time-Lag (Slow-Blow) | Determines tolerance to inrush currents; slow-blow types suit inductive or motor loads. |
| Package / Size | 5 mm × 20 mm Cartridge | 5 mm × 20 mm Cartridge | Physical dimensions must match the holder or clip for mechanical interchangeability. |
| Mounting Type | Holder / Clip | Holder / Clip | Defines how the fuse is installed; must be compatible with the existing fuse holder. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Ensures reliable operation and correct derating across the application's ambient conditions. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 0154002.DR | 0154003.DR |
|---|---|---|
| Series | OMNI-BLOK® 154 | OMNI-BLOK® 154 |
| Part Status | Active | Active |
| Mounting Type | Holder, Surface Mount | Holder, Surface Mount |
| Fuse Type | Board Mount (Cartridge Style Excluded) | Board Mount (Cartridge Style Excluded) |
| Current Rating (Amps) | 2 A | 3 A |
| Voltage Rating - AC | 125 V | 125 V |
| Voltage Rating - DC | 125 V | 125 V |
| Response Time | Fast Blow | Fast Blow |
| Breaking Capacity @ Rated Voltage | 50A | 50A |
| Melting I²t | 0.53 | 1.65 |
| Approval Agency | PSE, UL | PSE, UL |
| Operating Temperature | -55°C ~ 125°C | -55°C ~ 125°C |
Frequently asked questions
What are the 0154003.DR and 0154002.DR components?
The 0154003.DR and 0154002.DR are surface-mount fuse holders from the Littelfuse 154 series, designed for use with 5 mm x 20 mm cartridge fuses. They are through-hole or surface-mount PCB fuse holders intended for overcurrent protection in electronic circuits.
What is the main difference between the 0154003.DR and 0154002.DR?
The primary difference is the fuse holder configuration and contact arrangement. The 0154003.DR is a fuse holder with a specific contact style and orientation, while the 0154002.DR features a different contact configuration. Both accept 5 mm x 20 mm fuses but differ in their mounting and terminal design, which affects PCB layout compatibility.
Are the 0154003.DR and 0154002.DR interchangeable?
No, they are not directly interchangeable. Although both are 5 mm x 20 mm fuse holders from the same series, their different contact configurations and PCB footprint requirements mean they cannot be swapped without verifying mechanical and electrical compatibility against the manufacturer datasheet and the target PCB design.
What fuse size do the 0154003.DR and 0154002.DR accept?
Both the 0154003.DR and 0154002.DR accept standard 5 mm x 20 mm cartridge fuses, which is a common fuse size in electronic equipment for overcurrent protection.
What are the typical applications for the 0154003.DR and 0154002.DR?
These fuse holders are typically used in applications requiring replaceable overcurrent protection, such as power supplies, industrial control equipment, consumer electronics, and instrumentation where 5 mm x 20 mm fuses are employed.
What is the current rating of the 0154003.DR and 0154002.DR?
The current rating of these fuse holders depends on the specific fuse installed and the holder's own contact rating. The holder itself is rated for a maximum current as specified in the Littelfuse 154 series datasheet. The actual current carrying capability is limited by the lower of the fuse rating or the holder rating. Consult the manufacturer datasheet for the exact holder current rating.
What mounting type do the 0154003.DR and 0154002.DR use?
Both the 0154003.DR and 0154002.DR are PCB-mount fuse holders. The specific mounting style (surface-mount or through-hole) and terminal orientation differ between the two part numbers and should be confirmed from the Littelfuse 154 series datasheet before PCB layout.
What voltage rating applies to the 0154003.DR and 0154002.DR?
The voltage rating of these fuse holders is specified in the Littelfuse 154 series datasheet. The holder voltage rating must be equal to or greater than the circuit voltage, and the installed fuse must also have an adequate voltage rating. Verify the exact voltage rating from the manufacturer datasheet for each part number.