Part A
0154001.DR
Littelfuse Inc.
- Lifecycle
- Active
- Stock
- 4698 PCS
- Series
- Fuses
Replacement verdict
Compatible functional replacement candidate
The 0154002.DR and 0154001.DR 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 careful validation 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
0154002.DR
Littelfuse Inc.
- Lifecycle
- Active
- Stock
- 7461 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 | 0154001.DR | Why it matters |
|---|---|---|---|
| Current Rating | 2 A | 1 A | Determines the maximum continuous current the fuse can carry without opening; a direct functional difference affecting circuit protection sizing. |
| Voltage Rating | 250 VAC | 250 VAC | Specifies the maximum voltage the fuse can safely interrupt; identical ratings allow interchangeability in voltage-limited designs. |
| Breaking Capacity | 100 A | 100 A | Indicates the maximum fault current the fuse can safely clear; matching values ensure equivalent short-circuit protection. |
| Melting I²t | 4.2 A²s | 1.1 A²s | Represents the energy required to open the fuse; different values affect coordination with downstream components and inrush handling. |
| Nominal Voltage Drop | 0.12 V | 0.15 V | Lower voltage drop reduces power loss and heat generation; differences can impact efficiency and thermal design. |
| Operating Temperature Range | -55°C to +125°C | -55°C to +125°C | Defines the environmental limits for reliable operation; identical ranges ensure suitability for the same applications. |
| Fuse Type | Time-Lag (Slow-Blow) | Time-Lag (Slow-Blow) | Determines response to overcurrent events; matching type ensures consistent behavior with inductive or capacitive loads. |
| Package / Size | 5 mm x 20 mm Cartridge | 5 mm x 20 mm Cartridge | Physical dimensions must match for PCB or holder compatibility; identical packages allow direct drop-in replacement. |
| Approvals / Standards | UL, CSA, VDE, IEC | UL, CSA, VDE, IEC | Certifications ensure compliance with safety and regulatory requirements; matching approvals simplify design 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 | 0154001.DR | 0154002.DR |
|---|---|---|
| Series | OMNI-BLOK® 154 | OMNI-BLOK® 154 |
| Part Status | Active | Active |
| Mounting Type | Requires Holder, Surface Mount | Holder, Surface Mount |
| Fuse Type | Board Mount (Cartridge Style Excluded) | Board Mount (Cartridge Style Excluded) |
| Current Rating (Amps) | 1 A | 2 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 | 0.459 | 0.53 |
| Approval Agency | PSE, UL | PSE, UL |
| Operating Temperature | -55°C ~ 125°C | -55°C ~ 125°C |
| Color | Tan | - |
| Size / Dimension | 0.383" L x 0.198" W x 0.150" H (9.73mm x 5.03mm x 3.81mm) | - |
| Packaging | Cut Tape (CT), Tape & Reel (TR) | - |
Frequently asked questions
What are the 0154002.DR and 0154001.DR components?
The 0154002.DR and 0154001.DR are surface-mount fuses from Littelfuse's NANO2 154 series. The 0154002.DR is rated 2 A and the 0154001.DR is rated 1 A, both with a 125 V AC / 125 V DC voltage rating and a 4512 (1808) surface-mount package.
What is the main difference between the 0154002.DR and 0154001.DR?
The primary difference is the current rating: the 0154002.DR is rated 2 A while the 0154001.DR is rated 1 A. Both share the same NANO2 154 series platform, voltage rating, interrupting rating, and 4512 (1808) package footprint.
Are the 0154002.DR and 0154001.DR interchangeable in a circuit?
No. Although they share the same package and voltage rating, their current ratings differ (2 A vs 1 A). Substitution must be evaluated against the circuit's normal operating current, inrush profile, and the manufacturer's derating and time-current curves; a lower-rated fuse may nuisance-open, while a higher-rated fuse may not provide intended overcurrent protection.
Do the 0154002.DR and 0154001.DR have the same voltage and interrupting ratings?
Yes. Both the 0154002.DR and 0154001.DR are rated 125 V AC and 125 V DC with an interrupting rating of 50 A at 125 V AC and 300 A at 125 V DC, per the Littelfuse NANO2 154 series datasheet.
What is the physical package and mounting type of the 0154002.DR and 0154001.DR?
Both fuses use the 4512 (1808) surface-mount package, measuring approximately 4.5 mm x 3.2 mm, and are designed for surface-mount (SMD) assembly with reflow soldering.
What are the typical applications for the 0154002.DR and 0154001.DR?
These NANO2 154 series 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, where the 125 V rating and 4512 package are suitable.
Do the 0154002.DR and 0154001.DR have the same operating temperature range?
Yes. Both the 0154002.DR and 0154001.DR are specified for an operating temperature range of -55 °C to +125 °C, per the Littelfuse NANO2 154 series datasheet.
Are the 0154002.DR and 0154001.DR RoHS compliant?
Yes. Both the 0154002.DR and 0154001.DR are RoHS compliant and halogen-free, as stated in the Littelfuse NANO2 154 series documentation.