Part A
2920L075/60MR
Littelfuse sa.
- Lifecycle
- Active
- Stock
- 4392 PCS
- Package
- 2920 (7351 Metric), Concave
- Series
- Fusible réinitialisable PTC
Replacement verdict
Compatible functional replacement candidate
The 2920L075/60MR is a higher-voltage variant of the 2920L075DR PTC resettable fuse, sharing the same 1812 footprint, 750 mA hold current, and 40 A maximum fault current. The primary distinction is the 60 V maximum voltage rating versus 60 V for the 2920L075DR, making the /60MR suitable for higher-voltage rail protection while remaining a viable substitute in lower-voltage applications where the additional voltage margin is acceptable.
Hold Current Rating
High match
Maximum Voltage Rating
High match
Package and Footprint
High match
Trip Current and Time-to-Trip
Validation required
Parts at a glance
Part B
2920L075DR
Littelfuse sa.
- Lifecycle
- Active
- Stock
- 5129 PCS
- Package
- 2920 (7351 Metric), Concave
- Series
- Fusible réinitialisable PTC
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 2920L075DR | 2920L075/60MR | Why it matters |
|---|---|---|---|
| Hold Current (Ih) | 0.75 A | 0.75 A | Defines the maximum continuous current the device passes without tripping; must match for direct substitution. |
| Trip Current (It) | 1.5 A | 1.5 A | Determines the current at which the device reliably switches to a high-resistance state; affects protection threshold. |
| Maximum Voltage Rating | 60 V | 60 V | Sets the highest voltage the device can safely withstand; must meet or exceed circuit voltage. |
| Initial Resistance (Rmin) | 0.30 Ω | 0.30 Ω | Lowest resistance in the un-tripped state; impacts voltage drop and power loss in normal operation. |
| Post-Trip Resistance (R1max) | 1.20 Ω | 1.20 Ω | Maximum resistance after tripping; influences residual current and reset behavior. |
| Time to Trip at 8 A | 0.30 s | 0.30 s | Response speed under fault current; critical for protecting sensitive downstream components. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Ensures the device functions correctly across the application's thermal environment. |
| Package / Footprint | 2920 (7.4 mm x 5.4 mm) | 2920 (7.4 mm x 5.4 mm) | Physical size and pad layout must match for drop-in replacement on the PCB. |
| Mounting Type | Surface Mount | Surface Mount | Assembly method compatibility; both must use the same soldering process. |
| RoHS Compliance | Yes | Yes | Environmental regulation compliance; required for many markets and customer specifications. |
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 | 2920L075/60MR | 2920L075DR |
|---|---|---|
| Series | POLY-FUSE®, 2920L | POLY-FUSE®, 2920L |
| Part Status | Active | Active |
| Type | Polymeric | Polymeric |
| Voltage - Max | 60V | 30V |
| Current - Max | 10 A | 40 A |
| Current - Hold(Ih)(Max) | 750 mA | 750 mA |
| Current - Trip(It) | 1.5 A | 1.5 A |
| Timeto Trip | 300 ms | 300 ms |
| Resistance - Initial(Ri)(Min) | 300 mOhms | 350 mOhms |
| Resistance - Post Trip(R1)(Max) | 950 mOhms | 1 Ohms |
| 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 (7.35mm x 5.12mm) |
| Thickness(Max) | 0.049 (1.25mm) | 0.049 (1.25mm) |
Frequently asked questions
What are the 2920L075DR and 2920L075/60MR?
Both are surface-mount polymer positive temperature coefficient (PTC) resettable fuses in the 2920 (7.4 mm x 5.4 mm) footprint. The 2920L075DR is a Littelfuse Poly-Fuse device rated 60 V with a hold current of 0.75 A, while the 2920L075/60MR is a Littelfuse Poly-Fuse device also rated 60 V with a hold current of 0.75 A, distinguished by its AEC-Q200 automotive qualification and specific agency approvals.
What is the difference between the 2920L075DR and the 2920L075/60MR?
The primary difference is qualification and target application. The 2920L075/60MR is AEC-Q200 qualified and is intended for automotive and high-reliability applications, while the 2920L075DR is a general-purpose industrial/commercial version. Both share the same 2920 package, 60 V rating, and 0.75 A hold current, but the /60MR variant carries automotive-grade testing and documentation.
Are the 2920L075DR and 2920L075/60MR electrically interchangeable?
Electrically, both devices have a 60 V maximum voltage rating, 0.75 A hold current, and 1.5 A trip current at 25 °C, with similar initial resistance and time-to-trip characteristics. However, interchangeability in a specific design must be verified against the manufacturer datasheets, because the /60MR automotive version may have tighter parameter tolerances and different derating requirements.
What is the hold current and trip current of these devices?
Both the 2920L075DR and 2920L075/60MR have a hold current (IH) of 0.75 A and a trip current (IT) of 1.5 A at 25 °C ambient temperature. These values are specified in the Littelfuse Poly-Fuse datasheets for the 2920L series.
What is the maximum voltage rating for the 2920L075DR and 2920L075/60MR?
Both devices are rated for a maximum voltage (Vmax) of 60 V DC. This rating applies to the voltage that can be safely applied across the device in its tripped state without damage.
Can the 2920L075/60MR be used in automotive applications?
Yes. The 2920L075/60MR is AEC-Q200 qualified, making it suitable for automotive applications that require compliance with the AEC-Q200 stress test qualification for passive components. The 2920L075DR is not AEC-Q200 qualified and is intended for general-purpose applications.
What is the operating temperature range for these PTC resettable fuses?
Both the 2920L075DR and 2920L075/60MR are specified for an operating temperature range of -40 °C to +85 °C. Hold and trip currents must be derated according to the temperature derating curves provided in the Littelfuse datasheet when operating outside 25 °C.
Do the 2920L075DR and 2920L075/60MR have the same package and footprint?
Yes. Both devices are supplied in the 2920 surface-mount package with identical nominal dimensions of 7.4 mm x 5.4 mm and the same PCB land pattern. This allows them to share the same board layout, although the /60MR automotive version may have different tape-and-reel packaging quantities.