Part A
0154004.DR
Littelfuse Inc.
- Lifecycle
- Active
- Stock
- 2594 PCS
- Package
- 2-SMD
- Series
- Fuses
Replacement verdict
Compatible functional replacement candidate
The 0154005.DRT is a compatible functional replacement candidate for the 0154004.DR, with identical voltage rating, current rating, and package type, though the breaking capacity differs and requires validation for the target application.
Voltage Rating
High match
Current Rating
High match
Package Type
High match
Breaking Capacity
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 | 0154004.DR | 0154005.DRT | Why it matters |
|---|---|---|---|
| Current Rating | 4 A | 5 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. |
| Breaking Capacity | 50 A at 125 VAC | 50 A at 125 VAC | Indicates the maximum fault current the fuse can safely clear without damage or hazard. |
| Fuse Type | Board mount, surface mount (SMD) | Board mount, surface mount (SMD) | Determines mounting method and compatibility with the PCB assembly process. |
| Package / Size | Nano2 (SMF) 6.1 x 2.69 mm | Nano2 (SMF) 6.1 x 2.69 mm | Physical footprint must match the PCB land pattern for drop-in substitutability. |
| Blow Characteristic | Very Fast-Acting (FF) | Very Fast-Acting (FF) | Defines the time-current response; must match the protection scheme of the circuit. |
| 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. |
| Nominal Melting I²t | 1.9 A²s | 3.1 A²s | Governs energy let-through during a fault; differs with current rating and affects downstream component protection. |
| Nominal Voltage Drop | 0.13 V | 0.12 V | Affects power loss and voltage headroom in the circuit; lower is generally preferred. |
| Interrupting Rating (DC) | 50 A at 125 VDC | 50 A at 125 VDC | Confirms safe DC fault interruption capability for DC-powered applications. |
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.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) | 4 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 | 3.152 | 53.72 |
| Approval Agency | PSE, UL | PSE, UL |
| Operating Temperature | -55°C ~ 125°C | -55°C ~ 125°C |
Frequently asked questions
What are the 0154004.DR and 0154005.DRT components?
The 0154004.DR and 0154005.DRT are surface-mount fuses from Littelfuse's 154 series, designed for overcurrent protection in electronic circuits. The 0154004.DR is rated for 4 A, while the 0154005.DRT is rated for 5 A. Both are fast-acting fuses in a compact 1206 (3216 metric) package.
What is the primary difference between the 0154004.DR and 0154005.DRT?
The main difference is the current rating: the 0154004.DR has a rated current of 4 A, and the 0154005.DRT has a rated current of 5 A. Other specifications, such as voltage rating, breaking capacity, and package size, are typically identical within the same series.
Are the 0154004.DR and 0154005.DRT interchangeable in a circuit design?
They are not directly interchangeable because their current ratings differ. Substituting a 4 A fuse with a 5 A fuse (or vice versa) changes the overcurrent protection threshold, which can affect circuit safety and compliance. Always verify that the replacement fuse meets the design's current and voltage requirements.
What is the voltage rating of the 0154004.DR and 0154005.DRT?
Both fuses are rated for 125 V AC/DC (or as specified in the Littelfuse 154 series datasheet). This voltage rating must not be exceeded in the application to ensure proper breaking capacity and safety.
What is the breaking capacity of these fuses?
The breaking capacity for the 0154004.DR and 0154005.DRT is typically 50 A at rated voltage, as per the Littelfuse 154 series datasheet. This indicates the maximum fault current the fuse can safely interrupt without damage or hazard.
What are the physical dimensions and mounting type of these fuses?
Both the 0154004.DR and 0154005.DRT come in a 1206 (3216 metric) surface-mount package. They are designed for automated PCB assembly and have a compact footprint suitable for space-constrained applications.
What is the operating temperature range for the 0154004.DR and 0154005.DRT?
The operating temperature range for the Littelfuse 154 series fuses is typically -55°C to +125°C, as specified in the datasheet. This range ensures reliable performance in diverse environmental conditions.
Are the 0154004.DR and 0154005.DRT RoHS compliant?
Yes, both the 0154004.DR and 0154005.DRT are RoHS compliant, as indicated by Littelfuse's environmental documentation. This makes them suitable for use in products requiring compliance with European Union directives on hazardous substances.