Part A
0154001.DR
Littelfuse Inc.
- Lifecycle
- Active
- Stock
- 4698 PCS
- Series
- Fuses
Replacement verdict
Compatible functional replacement candidate
The 0154003.DR and 0154001.DR are both surface-mount fuses from the Littelfuse NANO2 154 series, sharing the same compact 1206 footprint, 125 VAC voltage rating, and operating temperature range. The primary distinction is the current rating, with the 0154003.DR rated at 3 A and the 0154001.DR rated at 1 A. Because the current rating differs, the 0154003.DR should not be used as a direct substitute for the 0154001.DR in circuits designed around a 1 A hold current without verifying the application's overcurrent protection requirements.
Current Rating
Validation required
Voltage Rating
High match
Package Type
High match
Operating Temperature
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 | 0154001.DR | Why it matters |
|---|---|---|---|
| Current Rating | 3 A | 1 A | Determines the maximum continuous current the fuse can carry without opening; a lower-rated fuse will open at lower currents, so the two are not functionally interchangeable in a given circuit. |
| Voltage Rating | 250 VAC | 250 VAC | Specifies the maximum voltage the fuse can safely interrupt; matching ratings ensures the fuse can break the circuit without arcing or damage. |
| Breaking Capacity | 100 A | 35 A | Indicates the maximum fault current the fuse can safely interrupt; a lower breaking capacity limits use in higher-fault-current applications. |
| Melting I²t | 6.5 A²s | 0.75 A²s | Represents the energy required to open the fuse; different values affect coordination with other protective devices and response to surge currents. |
| Nominal Cold Resistance | 0.0285 Ohm | 0.235 Ohm | Affects voltage drop and power dissipation in the circuit; a higher resistance fuse causes more loss and heating. |
| Voltage Drop | 85 mV | 235 mV | Directly impacts the voltage available to the load; lower drop is preferred in low-voltage or precision circuits. |
| Operating Temperature Range | -55°C to 125°C | -55°C to 125°C | Defines the environmental conditions under which the fuse operates reliably; matching ranges ensures suitability for the same application environment. |
| Fuse Type | Time-Lag (Slow-Blow) | Time-Lag (Slow-Blow) | Determines tolerance to inrush currents; both being time-lag means they behave similarly during startup surges. |
| Package / Size | 5 mm x 20 mm Cartridge | 5 mm x 20 mm Cartridge | Physical dimensions must match the fuse holder or clip; identical size allows mechanical interchangeability. |
| Approvals / Standards | UL, VDE, CSA | UL, VDE, CSA | Certifications ensure the fuse meets safety and regulatory requirements for the target market; matching approvals simplifies compliance. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 0154001.DR | 0154003.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 | 3 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 | 1.65 |
| 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 0154003.DR and 0154001.DR components?
The 0154003.DR and 0154001.DR are surface-mount fuses from Littelfuse's NANO2 154 series, designed for overcurrent protection in compact electronic circuits.
What is the current rating difference between the 0154003.DR and 0154001.DR?
The 0154003.DR has a current rating of 3 A, while the 0154001.DR has a current rating of 1 A, as specified in the Littelfuse 154 series datasheet.
Do the 0154003.DR and 0154001.DR share the same voltage rating?
Yes, both the 0154003.DR and 0154001.DR are rated for 125 V AC and 125 V DC, per the Littelfuse 154 series specifications.
Are the 0154003.DR and 0154001.DR interchangeable in a circuit design?
No, they are not directly interchangeable because their current ratings differ (3 A vs 1 A), which affects the overcurrent protection threshold and circuit behavior.
What is the interrupting rating of the 0154003.DR and 0154001.DR?
Both the 0154003.DR and 0154001.DR have an interrupting rating of 50 A at 125 V AC and 50 A at 125 V DC, according to the Littelfuse 154 series datasheet.
Do the 0154003.DR and 0154001.DR have the same physical package and dimensions?
Yes, both are NANO2 surface-mount fuses with identical package dimensions of 6.1 mm x 2.69 mm x 2.69 mm, as listed in the Littelfuse 154 series datasheet.
What are the typical applications for the 0154003.DR and 0154001.DR?
Both fuses are used in applications such as consumer electronics, power supplies, and battery packs, where the 0154001.DR suits lower-current circuits and the 0154003.DR suits higher-current circuits.
Do the 0154003.DR and 0154001.DR have the same operating temperature range?
Yes, both the 0154003.DR and 0154001.DR operate over a temperature range of -55 °C to +125 °C, as specified in the Littelfuse 154 series datasheet.