Part A
0154002.DR
Littelfuse Inc.
- Lifecycle
- Active
- Stock
- 7461 Stückzahl
- Package
- 2-SMD
- Series
- Sicherungen
Replacement verdict
Compatible functional replacement candidate
The 0154002.DR is a lower-current-rated fuse of the same physical series as the 0154005.DR, sharing identical voltage rating, package type, and breaking capacity. It can serve as a functional replacement only where the reduced current rating is acceptable for the target circuit.
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 Stückzahl
- Package
- 2-SMD
- Series
- Sicherungen
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 | 0154002.DR | Why it matters |
|---|---|---|---|
| Current Rating | 5 A | 2 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; identical ratings allow interchangeability in voltage-limited designs. |
| Breaking Capacity | 50 A at 125 VAC | 50 A at 125 VAC | Indicates the maximum fault current the fuse can safely clear; matching values ensure equivalent short-circuit protection. |
| Melting I²t | 22.5 A²s | 3.6 A²s | Represents thermal energy required to open the fuse; different values affect response time and coordination with downstream components. |
| Nominal Cold Resistance | 0.0155 Ohm | 0.0625 Ohm | Lower resistance reduces voltage drop and power loss; a difference impacts circuit efficiency and thermal behavior. |
| Voltage Drop at Rated Current | 0.0775 V | 0.125 V | Affects the voltage available to the load; different drops can influence circuit performance in low-voltage applications. |
| Fuse Type | Time-Lag (Slow-Blow) | Time-Lag (Slow-Blow) | Determines tolerance to inrush currents; identical type ensures similar behavior during startup transients. |
| Package / Size | Nano2 SMF (6.1 x 2.69 mm) | Nano2 SMF (6.1 x 2.69 mm) | Physical footprint must match for PCB layout compatibility; identical packages allow direct drop-in replacement. |
| Operating Temperature Range | -55°C to +125°C | -55°C to +125°C | Defines environmental limits for reliable operation; matching ranges ensure suitability for the same application conditions. |
| Approvals / Standards | UL, CSA, VDE, PSE | UL, CSA, VDE, PSE | Certifications affect regulatory compliance and market acceptance; identical approvals simplify qualification. |
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 | 0154005.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 | 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 | 0.53 | 5.566 |
| Approval Agency | PSE, UL | PSE, UL |
| Operating Temperature | -55°C ~ 125°C | -55°C ~ 125°C |
Frequently asked questions
What are the 0154005.DR and 0154002.DR fuses?
The 0154005.DR and 0154002.DR are Littelfuse Nano2 SMF series surface-mount fuses. The 0154005.DR is rated 5 A and the 0154002.DR is rated 2 A. Both are fast-acting (F) fuses in a 6.1 mm x 2.69 mm ceramic body with a 2.69 mm height profile, intended for overcurrent protection on printed circuit boards.
What is the main difference between the 0154005.DR and 0154002.DR?
The primary difference is the current rating: the 0154005.DR has a 5 A rating, while the 0154002.DR has a 2 A rating. Both share the same Nano2 SMF package, voltage rating, interrupting rating, and fast-acting characteristic, so the selection is driven by the load current and required protection level.
Are the 0154005.DR and 0154002.DR interchangeable?
No. Although they share the same physical package and footprint, they have different current ratings (5 A vs 2 A). Substituting one for the other changes the overcurrent protection threshold and may cause nuisance opening or inadequate protection. Replacement must be based on the circuit's specified current rating.
What is the voltage rating of the 0154005.DR and 0154002.DR?
Both the 0154005.DR and 0154002.DR are rated for 125 V AC and 125 V DC. This voltage rating applies to both current variants in the Littelfuse Nano2 SMF series.
What is the interrupting rating of the 0154005.DR and 0154002.DR?
Both fuses have an interrupting rating of 50 A at 125 V AC and 50 A at 125 V DC. This is the maximum fault current the fuse can safely interrupt at its rated voltage.
What are the operating temperature and melting I²t characteristics of these fuses?
Both the 0154005.DR and 0154002.DR operate over a temperature range of -55 °C to +125 °C. The nominal melting I²t is approximately 22 A²s for the 0154005.DR and approximately 3.5 A²s for the 0154002.DR, reflecting the difference in current rating.
What are the typical applications for the 0154005.DR and 0154002.DR?
These Nano2 SMF fuses are typically used for overcurrent protection in space-constrained surface-mount circuits such as power supplies, battery packs, consumer electronics, and industrial control boards. The 0154005.DR suits higher-current rails, while the 0154002.DR suits lower-current rails requiring the same package and voltage rating.
Do the 0154005.DR and 0154002.DR have the same package and mounting style?
Yes. Both are supplied in the same surface-mount Nano2 SMF package with identical dimensions and terminal configuration, so they share the same PCB land pattern. The difference is electrical, not mechanical.
What should be verified before selecting between the 0154005.DR and 0154002.DR?
Verify the circuit's normal operating current, inrush current profile, required voltage rating, interrupting rating, and ambient temperature. Confirm the selected fuse's rating and melting I²t against the manufacturer datasheet to ensure proper protection without nuisance opening.