Part A
0154004.DR
Littelfuse sa.
- Lifecycle
- Active
- Stock
- 2594 PCS
- Package
- 2-SMD
- Series
- Fusibles
Replacement verdict
Compatible functional replacement candidate
The 0154005.DR and 0154004.DR are both fast-acting cartridge fuses from the same Littelfuse 154 series with identical voltage ratings, interrupt ratings, and physical dimensions, making them strong functional replacement candidates. The primary distinction is the current rating, which must be validated against the specific circuit's overcurrent protection requirements 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 sa.
- Lifecycle
- Active
- Stock
- 7092 PCS
- Package
- 2-SMD
- Series
- Fusibles
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 | 0154004.DR | Why it matters |
|---|---|---|---|
| Current Rating | 5 A | 4 A | Determines the maximum continuous current the fuse can carry without opening; a lower-rated fuse may open under normal load, while a higher-rated one may not protect the circuit adequately. |
| 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 to ensure proper breaking capacity. |
| Fuse Type | Fast-Acting (Fast-Blow) | Fast-Acting (Fast-Blow) | Indicates the time-current response; fast-acting fuses protect sensitive components by opening quickly on overcurrent. |
| Package / Size | Nano2 SMF (6.1 x 2.69 mm) | Nano2 SMF (6.1 x 2.69 mm) | Physical footprint and mounting style must match the PCB pad layout for drop-in substitutability. |
| Mounting Type | Surface Mount (SMD) | Surface Mount (SMD) | Ensures the component can be placed on the same board using the same assembly process. |
| Interrupting Rating | 50 A at 125 VAC / 300 A at 125 VDC | 50 A at 125 VAC / 300 A at 125 VDC | Specifies the maximum fault current the fuse can safely clear without rupturing or arcing; must exceed the available short-circuit current. |
| Operating Temperature Range | -55°C to +125°C | -55°C to +125°C | Affects reliability and derating; the fuse must operate correctly across the application's ambient temperature range. |
| Nominal Melting I²t | Approx. 22 A²s | Approx. 14 A²s | Represents the energy required to open the fuse; influences coordination with downstream components and inrush withstand capability. |
| RoHS Compliance | RoHS Compliant | RoHS Compliant | Ensures the part meets environmental regulations for lead and other restricted substances in many 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 | 0154004.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) | 4 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 | 3.152 | 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 0154004.DR components?
The 0154005.DR and 0154004.DR are surface-mount fuses from Littelfuse's 154 series, designed for overcurrent protection in electronic circuits. The 0154005.DR is rated at 5 A, while the 0154004.DR is rated at 4 A, both with a voltage rating of 125 V AC/DC and a breaking capacity of 50 A at 125 V AC/DC.
What is the main difference between the 0154005.DR and 0154004.DR?
The primary difference is the current rating: the 0154005.DR has a 5 A rating, and the 0154004.DR has a 4 A rating. Both share the same voltage rating (125 V AC/DC), breaking capacity (50 A), and physical package (surface-mount, 1206 size).
Are the 0154005.DR and 0154004.DR interchangeable in a circuit?
No, they are not directly interchangeable because their current ratings differ (5 A vs. 4 A). Substitution must be evaluated against the circuit's overcurrent protection requirements, and the replacement must not exceed the original design's current rating without verification.
What is the voltage rating of the 0154005.DR and 0154004.DR?
Both the 0154005.DR and 0154004.DR have a voltage rating of 125 V AC/DC, as specified in the Littelfuse 154 series datasheet.
What is the breaking capacity of the 0154005.DR and 0154004.DR?
Both fuses have a breaking capacity of 50 A at 125 V AC/DC, according to the Littelfuse 154 series datasheet.
What package size do the 0154005.DR and 0154004.DR use?
Both the 0154005.DR and 0154004.DR are supplied in a surface-mount 1206 (3216 metric) package, as stated in the Littelfuse 154 series datasheet.
Do the 0154005.DR and 0154004.DR have the same time-current characteristics?
Yes, both the 0154005.DR and 0154004.DR are fast-acting fuses with the same time-current curve family, but the actual melting times differ due to their different current ratings. The 0154004.DR will open at lower currents than the 0154005.DR for a given overload condition.
What are the typical applications for the 0154005.DR and 0154004.DR?
These fuses are typically used for overcurrent protection in battery packs, power supplies, and portable electronics where a compact surface-mount fuse with a 125 V AC/DC rating and 50 A breaking capacity is required. The choice between 4 A and 5 A depends on the specific circuit's current requirements.