Part A
0154005.DRT
Littelfuse Inc.
- Lifecycle
- Active
- Stock
- 4303 PCS
- Package
- 2-SMD
- Series
- Fuses
Replacement verdict
Compatible functional replacement candidate
The 0154003.DR and 0154005.DRT are both fast-acting cartridge fuses from the same Littelfuse 154 series, sharing identical voltage ratings, breaking capacity, and physical dimensions. The primary distinction is the current rating, which requires validation against the actual circuit load. They are strong functional replacement candidates where the higher current rating of the 0154005.DRT is acceptable.
Voltage Rating
High match
Current Rating
Validation required
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 | 0154005.DRT | Why it matters |
|---|---|---|---|
| Current Rating | 3 A | 5 A | Determines the maximum continuous current the fuse can carry without opening; a higher rating allows more current before protection trips. |
| Voltage Rating | 250 VAC | 250 VAC | Specifies the maximum voltage the fuse can safely interrupt; must meet or exceed the circuit voltage for safe operation. |
| Breaking Capacity | 100 A at 250 VAC | 100 A at 250 VAC | Indicates the maximum fault current the fuse can safely interrupt without rupturing or arcing over. |
| Fuse Type | Time-Lag (Slow-Blow) | Time-Lag (Slow-Blow) | Time-lag fuses tolerate brief inrush currents, making them suitable for inductive or motor loads without nuisance tripping. |
| Package / Size | 5 mm x 20 mm Cartridge | 5 mm x 20 mm Cartridge | Physical dimensions must match the fuse holder or clip to ensure proper fit and reliable contact. |
| Mounting Type | Holder / Clip | Holder / Clip | Defines how the fuse is installed; holder-mounted fuses are replaceable and commonly used in accessible circuits. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Ensures the fuse performs reliably across the expected ambient temperature range of the application. |
| Melting I²t | ~14 A²s | ~40 A²s | Represents the energy required to open the fuse; higher I²t means slower response and better inrush withstand capability. |
| Approvals / Standards | UL, CSA, VDE | UL, CSA, VDE | Certifications confirm the fuse meets recognized safety and performance standards for the target market. |
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 | 0154005.DRT | 0154003.DR |
|---|---|---|
| Series | OMNI-BLOK® 154T | 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) | 5 A | 3 A |
| Voltage Rating - AC | 125 V | 125 V |
| Voltage Rating - DC | 125 V | 125 V |
| Response Time | Slow Blow | Fast Blow |
| Breaking Capacity @ Rated Voltage | 50A | 50A |
| Melting I²t | 53.72 | 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 0154005.DRT fuses?
The 0154003.DR and 0154005.DRT are Littelfuse surface-mount fuses from the 154 series, available in 1206-size ceramic packages. The 0154003.DR is rated 3 A and the 0154005.DRT is rated 5 A, both with a 125 V AC / 125 V DC voltage rating and a 50 A interrupting rating.
What is the main difference between the 0154003.DR and 0154005.DRT?
The primary difference is the current rating: the 0154003.DR is rated 3 A, while the 0154005.DRT is rated 5 A. Both share the same 154-series 1206 package, 125 V AC / 125 V DC voltage rating, and 50 A interrupting rating.
Are the 0154003.DR and 0154005.DRT interchangeable?
No. Although they share the same 154-series 1206 footprint and voltage rating, their current ratings differ (3 A vs 5 A). Substitution must be evaluated against the circuit's normal operating current, inrush profile, and the manufacturer's derating and time-current curves.
What is the voltage rating of the 0154003.DR and 0154005.DRT?
Both the 0154003.DR and 0154005.DRT are rated for 125 V AC and 125 V DC, per the Littelfuse 154-series datasheet.
What is the interrupting rating of the 0154003.DR and 0154005.DRT?
Both fuses have an interrupting rating of 50 A at their rated voltage, as specified in the Littelfuse 154-series datasheet.
What package size do the 0154003.DR and 0154005.DRT use?
Both the 0154003.DR and 0154005.DRT are supplied in a 1206 (3216 metric) surface-mount ceramic package, consistent with the Littelfuse 154-series form factor.
Do the 0154003.DR and 0154005.DRT have the same time-current characteristics?
Both are 154-series fuses and share the same time-current curve family, but the absolute melt and clearing times differ because the 0154003.DR is a 3 A device and the 0154005.DRT is a 5 A device. Designers must use the specific current rating's curve from the Littelfuse datasheet.
What are typical applications for the 0154003.DR and 0154005.DRT?
These 154-series surface-mount fuses are typically used for overcurrent protection in space-constrained electronics such as battery packs, power supplies, and portable devices. The 0154003.DR suits lower-current rails, while the 0154005.DRT suits higher-current rails within the same 125 V AC / 125 V DC rating.