Part A
2920L075/60MR
리틀퓨즈(주)
- Lifecycle
- Active
- Stock
- 4392 PCS
- Package
- 2920 (7351 Metric), Concave
- Series
- PTC 재설정 퓨즈
Replacement verdict
Compatible functional replacement candidate
The 2920L110/60MR is a viable functional replacement candidate for the 2920L075/60MR in many circuit protection applications, sharing the same polymer PTC technology, 60 V voltage rating, and 2920 footprint. However, the higher hold current and lower trip resistance of the 2920L110/60MR require careful validation against the original circuit's overcurrent threshold and thermal profile before substitution.
Voltage Rating
High match
Hold Current
Validation required
Trip Current
Validation required
Package Type
High match
Parts at a glance
Part B
2920L110/60MR
리틀퓨즈(주)
- Lifecycle
- Active
- Stock
- 5268 PCS
- Package
- 2920 (7351 Metric), Concave
- Series
- PTC 재설정 퓨즈
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 2920L075/60MR | 2920L110/60MR | Why it matters |
|---|---|---|---|
| Hold Current (Ih) | 0.75 A | 1.10 A | Defines the maximum continuous current the device passes without tripping; a higher hold current allows the circuit to operate at higher steady-state loads. |
| Trip Current (It) | 1.50 A | 2.20 A | Minimum current at which the device is guaranteed to trip; determines the fault current threshold for protection. |
| Maximum Voltage Rating | 60 V | 60 V | Maximum voltage the device can withstand while tripped; must exceed the circuit's supply voltage for safe operation. |
| Initial Resistance (Rmin) | 0.150 Ω | 0.100 Ω | Minimum resistance in the untripped state; lower resistance reduces voltage drop and power loss in normal operation. |
| Initial Resistance (Rmax) | 0.400 Ω | 0.250 Ω | Maximum resistance in the untripped state; affects worst-case voltage drop and heat generation in the circuit. |
| Post-Trip Resistance (R1max) | 0.900 Ω | 0.500 Ω | Maximum resistance after one trip; determines residual resistance and power loss after the device resets. |
| Maximum Time to Trip | 1.50 s at 8 A | 1.50 s at 8 A | Time required to trip under a specified fault current; critical for coordinating protection speed with circuit requirements. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Ambient temperature range over which the device maintains specified electrical characteristics. |
| Package Size | 2920 (7.4 mm x 5.4 mm) | 2920 (7.4 mm x 5.4 mm) | Physical footprint and height; must match the PCB land pattern for direct drop-in substitution. |
| Mounting Type | Surface Mount | Surface Mount | Assembly method compatibility; both must use the same mounting technology for interchangeability. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 2920L075/60MR | 2920L110/60MR |
|---|---|---|
| Series | POLY-FUSE®, 2920L | POLY-FUSE®, 2920L |
| Part Status | Active | Active |
| Type | Polymeric | Polymeric |
| Voltage - Max | 60V | 60V |
| Current - Max | 10 A | 20 A |
| Current - Hold(Ih)(Max) | 750 mA | 1.1 A |
| Current - Trip(It) | 1.5 A | 2.2 A |
| Timeto Trip | 300 ms | 500 ms |
| Resistance - Initial(Ri)(Min) | 300 mOhms | 120 mOhms |
| Resistance - Post Trip(R1)(Max) | 950 mOhms | 410 mOhms |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
| Size / Dimension | 0.289 L x 0.202 W (7.35mm x 5.12mm) | 0.289 L x 0.202 W (7.36mm x 5.12mm) |
| Thickness(Max) | 0.049 (1.25mm) | 0.079 (2.00mm) |
Frequently asked questions
What are the 2920L075/60MR and 2920L110/60MR devices?
Both are surface-mount polymer positive temperature coefficient (PPTC) resettable fuses in the Littelfuse 2920L series. They are used for overcurrent and overtemperature protection in electronic circuits and are supplied in a 2920 (7.4 mm x 5.4 mm) footprint.
What are the key electrical differences between the 2920L075/60MR and 2920L110/60MR?
The primary difference is the hold current rating. The 2920L075/60MR has a hold current of 0.75 A, while the 2920L110/60MR has a hold current of 1.10 A. Both are rated for 60 V maximum voltage. Trip current, initial resistance, and power dissipation also differ accordingly per the manufacturer datasheet.
Can the 2920L075/60MR and 2920L110/60MR be used interchangeably?
No. Although they share the same 2920 package and 60 V rating, their hold currents, trip currents, and resistance values differ. Substitution must be validated against the specific circuit's steady-state current, trip threshold, and thermal environment using the Littelfuse datasheet.
What is the maximum voltage rating for both the 2920L075/60MR and 2920L110/60MR?
Both devices have a maximum voltage rating of 60 V. This rating is specified in the Littelfuse 2920L series datasheet and applies to both part numbers.
What is the hold current of each device?
The 2920L075/60MR has a hold current of 0.75 A at 20 degrees C. The 2920L110/60MR has a hold current of 1.10 A at 20 degrees C. Hold current is the maximum current the device will pass without tripping under specified ambient conditions.
Do the 2920L075/60MR and 2920L110/60MR have the same trip current?
No. The trip current is higher for the 2920L110/60MR than for the 2920L075/60MR. Exact trip current values should be taken from the Littelfuse 2920L series datasheet, as they are specified at defined ambient temperature and time conditions.
Are the 2920L075/60MR and 2920L110/60MR RoHS compliant?
Littelfuse 2920L series PPTC resettable fuses are generally offered as RoHS compliant and halogen-free. Designers should confirm the specific part number's compliance status on the Littelfuse datasheet or product page before finalizing a design.
What is the operating temperature range for these devices?
The Littelfuse 2920L series is typically specified for operation over a temperature range of -40 degrees C to +85 degrees C. Hold and trip currents are temperature dependent, so derating curves in the datasheet must be consulted for operation outside 20 degrees C.
Which applications are suitable for the 2920L075/60MR versus the 2920L110/60MR?
The 2920L075/60MR is suited to circuits with lower steady-state currents up to 0.75 A, while the 2920L110/60MR supports higher steady-state currents up to 1.10 A. Selection depends on the application's normal operating current, fault current, ambient temperature, and available board space, all evaluated against the Littelfuse datasheet.