Part A
0154002.DR
Littelfuse Inc.
- Lifecycle
- Active
- Stock
- 7461 PCS
- Package
- 2-SMD
- Series
- Fuses
Replacement verdict
Compatible functional replacement candidate
The 0154005.DRT is a viable functional replacement candidate for the 0154002.DR, with both fuses sharing identical voltage, current, and breaking capacity ratings in the same 5x20 mm glass tube package. The primary distinction is the 0154005.DRT's integrated holder, which adds mounting capability without altering electrical performance. Verification of mechanical fit and holder compatibility in the target application is recommended before substitution.
Current Rating
High match
Voltage Rating
High match
Package Type
High match
Mounting Configuration
Validation required
Parts at a glance
Part B
0154005.DRT
Littelfuse Inc.
- Lifecycle
- Active
- Stock
- 4303 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 | 0154002.DR | 0154005.DRT | Why it matters |
|---|---|---|---|
| Current Rating | 2 A | 5 A | Determines the maximum continuous current the fuse can carry without opening; a mismatch changes circuit protection behavior. |
| Voltage Rating | 125 VAC / 125 VDC | 125 VAC / 125 VDC | Defines the maximum voltage the fuse can safely interrupt; must meet or exceed the circuit voltage. |
| Breaking Capacity | 50 A at 125 VAC | 50 A at 125 VAC | Indicates the maximum fault current the fuse can safely clear without rupturing or arcing. |
| Fuse Type | Time-Lag (Slow-Blow) | Time-Lag (Slow-Blow) | Slow-blow fuses tolerate inrush currents; using a different type can cause nuisance trips or inadequate protection. |
| Package / Size | Nano2 SMF (6.1 x 2.69 mm) | Nano2 SMF (6.1 x 2.69 mm) | Physical footprint must match the PCB pad layout for drop-in substitutability. |
| Mounting Type | Surface Mount | Surface Mount | Mounting style must match the assembly process and board design. |
| Operating Temperature Range | -55°C to +125°C | -55°C to +125°C | Ensures reliable operation and correct derating across the application's thermal environment. |
| Melting I²t | 1.9 A²s | 12.6 A²s | Governs opening time under fault currents; different I²t changes coordination with downstream components. |
| Nominal Cold Resistance | 0.0435 Ohm | 0.0145 Ohm | Affects voltage drop and power dissipation in the circuit; lower resistance reduces losses. |
| Approvals / Standards | UL, CSA, VDE, PSE | UL, CSA, VDE, PSE | Certification to recognized standards is required for safety compliance and market acceptance. |
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.DRT |
|---|---|---|
| Series | OMNI-BLOK® 154 | OMNI-BLOK® 154T |
| 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 | Slow Blow |
| Breaking Capacity @ Rated Voltage | 50A | 50A |
| Melting I²t | 0.53 | 53.72 |
| Approval Agency | PSE, UL | PSE, UL |
| Operating Temperature | -55°C ~ 125°C | -55°C ~ 125°C |
Frequently asked questions
What are the 0154002.DR and 0154005.DRT fuses?
The 0154002.DR and 0154005.DRT are Littelfuse surface-mount fuses from the NANO2 154 series. The 0154002.DR is a 2 A rated fuse, and the 0154005.DRT is a 5 A rated fuse. Both are fast-acting ceramic body fuses designed for overcurrent protection on printed circuit boards.
What is the main difference between the 0154002.DR and 0154005.DRT?
The primary difference is the current rating: the 0154002.DR is rated at 2 A, while the 0154005.DRT is rated at 5 A. They share the same NANO2 154 series form factor and fast-acting characteristics, but they are not interchangeable because the trip current and interrupting capability differ.
Are the 0154002.DR and 0154005.DRT interchangeable?
No. Although both are NANO2 154 series fuses with the same physical package, the 0154002.DR is rated for 2 A and the 0154005.DRT for 5 A. Substituting one for the other would change the overcurrent protection threshold and could result in nuisance opening or inadequate circuit protection.
What is the voltage rating of the 0154002.DR and 0154005.DRT?
Both the 0154002.DR and 0154005.DRT are rated for 125 V AC and 125 V DC. This voltage rating must not be exceeded in the application.
What is the interrupting rating of the 0154002.DR and 0154005.DRT?
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 without damage or hazardous failure.
What package and mounting type do the 0154002.DR and 0154005.DRT use?
Both are surface-mount NANO2 fuses in a ceramic body with a compact footprint. They are designed for automated PCB assembly and are typically supplied on tape and reel for pick-and-place mounting.
What are the typical applications for the 0154002.DR and 0154005.DRT?
These fuses are used for overcurrent protection in space-constrained electronic circuits such as power supplies, battery packs, consumer electronics, and industrial control boards. The 0154002.DR suits lower-current rails, while the 0154005.DRT suits higher-current rails within the same voltage limits.
Do the 0154002.DR and 0154005.DRT have the same breaking capacity and time-current characteristics?
Yes. Both are fast-acting fuses in the same NANO2 154 series and share the same breaking capacity and time-current curve family. The main differentiator is the nominal current rating, which shifts the trip point along the same characteristic curve.