Part A
0154001.DR
Littelfuse Inc.
- Lifecycle
- Active
- Stock
- 4698 PCS
- Series
- Fuses
Replacement verdict
Compatible functional replacement candidate
The 0154001.DR is a compatible functional replacement candidate for the 0154005.DR, sharing the same fuse series, voltage rating, breaking capacity, and mounting style, with the primary distinction being the current rating. Designers must verify that the lower current rating of the 0154001.DR aligns with the actual operating current requirements of the target application before substitution.
Current Rating
Validation required
Voltage Rating
High match
Package Type
High match
Breaking Capacity
High match
Parts at a glance
Part B
0154005.DR
Littelfuse Inc.
- Lifecycle
- Active
- Stock
- 7092 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 | 0154005.DR | 0154001.DR | Why it matters |
|---|---|---|---|
| Current Rating | 5 A | 1 A | Determines the maximum continuous current the fuse can carry without opening; a direct functional difference affecting circuit protection sizing. |
| Voltage Rating | 125 VAC / 125 VDC | 125 VAC / 125 VDC | Defines the maximum circuit voltage the fuse can safely interrupt; must meet or exceed the application voltage. |
| Interrupting Rating | 50 A at 125 VAC / 50 A at 125 VDC | 50 A at 125 VAC / 50 A at 125 VDC | Indicates the maximum fault current the fuse can safely clear without rupturing; critical for safety in fault conditions. |
| Melting I²t | Approx. 22 A²s | Approx. 0.9 A²s | Represents thermal energy required to open the fuse; affects coordination and response time under overcurrent events. |
| Nominal Cold Resistance | Approx. 0.0155 Ohm | Approx. 0.245 Ohm | Lower resistance reduces voltage drop and power loss; impacts circuit efficiency and heat generation. |
| Voltage Drop at Rated Current | Approx. 100 mV | Approx. 280 mV | Affects available voltage to the load and power dissipation in the fuse during normal operation. |
| Fuse Type / Series | Littelfuse 154 Series, Fast-Acting, Surface Mount | Littelfuse 154 Series, Fast-Acting, Surface Mount | Confirms physical form factor and tripping characteristic; same series ensures mechanical and electrical compatibility. |
| Package / Size | Surface Mount, 1206 (3216 metric) | Surface Mount, 1206 (3216 metric) | Determines PCB footprint and assembly compatibility; identical package allows direct drop-in replacement. |
| Operating Temperature Range | -55°C to +125°C | -55°C to +125°C | Ensures reliable operation across environmental conditions; must match application temperature requirements. |
| Approvals / Compliance | UL Recognized, CSA Certified, RoHS Compliant | UL Recognized, CSA Certified, RoHS Compliant | Confirms regulatory acceptance for safety and environmental standards in target markets. |
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 | 0154001.DR | 0154005.DR |
|---|---|---|
| Series | OMNI-BLOK® 154 | OMNI-BLOK® 154 |
| Part Status | Active | Active |
| Mounting Type | Requires Holder, Surface Mount | Holder, Surface Mount |
| Fuse Type | Board Mount (Cartridge Style Excluded) | Board Mount (Cartridge Style Excluded) |
| Current Rating (Amps) | 1 A | 5 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 | 0.459 | 5.566 |
| Approval Agency | PSE, UL | PSE, UL |
| Operating Temperature | -55°C ~ 125°C | -55°C ~ 125°C |
| Color | Tan | - |
| Size / Dimension | 0.383" L x 0.198" W x 0.150" H (9.73mm x 5.03mm x 3.81mm) | - |
| Packaging | Cut Tape (CT), Tape & Reel (TR) | - |
Frequently asked questions
What are the 0154005.DR and 0154001.DR components?
The 0154005.DR and 0154001.DR are surface-mount fuses from Littelfuse's NANO2 154 series. The 0154005.DR is rated 5 A and the 0154001.DR is rated 1 A. Both are fast-acting ceramic body fuses designed for overcurrent protection on printed circuit boards.
What is the main difference between the 0154005.DR and 0154001.DR?
The primary difference is the current rating: the 0154005.DR has a 5 A rating, while the 0154001.DR has a 1 A rating. Voltage rating, interrupting rating, package size, and series characteristics are otherwise the same within the 154 series.
Are the 0154005.DR and 0154001.DR interchangeable?
No. They are not interchangeable because their current ratings differ (5 A versus 1 A). Substituting one for the other would change the overcurrent protection threshold and could result in nuisance opening or inadequate circuit protection. Replacement must match the original rating or be validated against the design requirements.
What are the voltage and interrupting ratings for these fuses?
Both the 0154005.DR and 0154001.DR are rated 125 V AC and 125 V DC, with an interrupting rating of 50 A at 125 V AC and 300 A at 125 V DC, per the Littelfuse 154 series datasheet.
What package and mounting type do the 0154005.DR and 0154001.DR use?
Both fuses use the NANO2 surface-mount package, which is a compact ceramic body with solderable terminations. They are designed for reflow soldering on PCB assemblies and are supplied on tape and reel for automated placement.
What are the typical applications for the 0154005.DR and 0154001.DR?
These fuses are typically used for overcurrent protection in power supplies, battery chargers, consumer electronics, industrial controls, and other PCB-level circuits. The 0154005.DR suits higher-current rails, while the 0154001.DR suits lower-current signal or bias circuits.
Do the 0154005.DR and 0154001.DR have the same operating temperature range?
Yes. Both are specified for operation from -55 °C to +125 °C, with current derating required at elevated temperatures according to the Littelfuse 154 series datasheet.
Are the 0154005.DR and 0154001.DR RoHS compliant?
Yes. Both the 0154005.DR and 0154001.DR are RoHS compliant and lead-free, as stated in Littelfuse 154 series documentation.