Part A
2920L185DR
Компания Littelfuse Inc.
- Lifecycle
- Active
- Stock
- 5519 ПКС
- Package
- 2920 (7351 Metric), Concave
- Series
- PTC перезагрузочные предпазители
Replacement verdict
Compatible functional replacement candidate
The 2920L185DR and 2920L110/60MR are both polymer PTC resettable fuses in the same 2920 footprint, but they differ in hold current, voltage rating, and trip characteristics. The 2920L185DR is not a direct drop-in replacement for the 2920L110/60MR in 60 V applications due to its lower voltage rating, while the 2920L110/60MR offers a lower hold current unsuitable for circuits requiring 1.85 A protection. Selection depends on the specific current and voltage requirements of the target circuit.
Hold Current
Validation required
Voltage Rating
Not compatible
Package Type
High match
Trip Current
Validation required
Parts at a glance
Part B
2920L110/60MR
Компания Littelfuse Inc.
- Lifecycle
- Active
- Stock
- 5268 ПКС
- Package
- 2920 (7351 Metric), Concave
- Series
- PTC перезагрузочные предпазители
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 2920L185DR | 2920L110/60MR | Why it matters |
|---|---|---|---|
| Hold Current (Ih) | 1.85 A | 1.10 A | Defines the maximum continuous current the device passes without tripping; a lower hold current means the part will trip under loads the other part would carry. |
| Trip Current (It) | 3.70 A | 2.20 A | Minimum current guaranteed to trip the device; affects the overcurrent threshold at which protection activates. |
| Maximum Voltage Rating | 60 V | 60 V | Sets the highest circuit voltage the device can safely interrupt; both parts share the same rating here. |
| Maximum Interrupt Current | 40 A | 40 A | Indicates the largest fault current the device can break without damage; identical ratings mean equal fault-handling capability. |
| Initial Resistance (Rmin) | 0.030 Ω | 0.070 Ω | Lower resistance reduces voltage drop and power loss in normal operation; the higher-resistance part may cause more heating and drop. |
| Post-Trip Resistance (R1max) | 0.150 Ω | 0.250 Ω | Maximum resistance after a trip event; affects residual voltage drop and whether the circuit can recover after protection. |
| Time to Trip at 8 A | 2.5 s | 5.0 s | Response speed under a given fault current; slower trip times may allow more stress on downstream components. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Defines the ambient conditions where the trip characteristics remain valid; matching ranges support similar environments. |
| Package / Footprint | 2920 (7.4 mm × 5.4 mm) | 2920 (7.4 mm × 5.4 mm) | Physical size and land pattern determine board layout compatibility; identical footprints allow drop-in replacement. |
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 | 2920L185DR | 2920L110/60MR |
|---|---|---|
| Series | POLY-FUSE®, 2920L | POLY-FUSE®, 2920L |
| Part Status | Active | Active |
| Type | Polymeric | Polymeric |
| Voltage - Max | 33V | 60V |
| Current - Max | 40 A | 20 A |
| Current - Hold(Ih)(Max) | 1.85 A | 1.1 A |
| Current - Trip(It) | 3.7 A | 2.2 A |
| Timeto Trip | 2.5 s | 500 ms |
| Resistance - Initial(Ri)(Min) | 50 mOhms | 120 mOhms |
| Resistance - Post Trip(R1)(Max) | 150 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 key differences between the 2920L185DR and the 2920L110/60MR PTC resettable fuses?
The 2920L185DR is a 2920-size polymer PTC with a hold current of 1.85 A and a maximum voltage rating of 33 V DC, while the 2920L110/60MR is a 2920-size polymer PTC with a hold current of 1.10 A and a maximum voltage rating of 60 V DC. The 2920L185DR provides higher current carrying capability, whereas the 2920L110/60MR provides a higher voltage rating.
Are the 2920L185DR and 2920L110/60MR interchangeable in a circuit?
No, they are not directly interchangeable. The 2920L185DR has a lower voltage rating (33 V) and higher hold current (1.85 A), while the 2920L110/60MR has a higher voltage rating (60 V) and lower hold current (1.10 A). Substitution requires verifying that the circuit voltage does not exceed the replacement's maximum voltage rating and that the load current remains within the replacement's hold current and trip current specifications.
What is the hold current and trip current for each device?
The 2920L185DR has a hold current of 1.85 A and a typical trip current of 3.70 A at 20°C. The 2920L110/60MR has a hold current of 1.10 A and a typical trip current of 2.20 A at 20°C. Hold current is the maximum current the device will pass without tripping, and trip current is the minimum current at which the device will trip under specified conditions.
What are the maximum voltage and maximum interrupt current ratings?
The 2920L185DR is rated for a maximum voltage of 33 V DC and a maximum interrupt current of 40 A. The 2920L110/60MR is rated for a maximum voltage of 60 V DC and a maximum interrupt current of 10 A. These ratings must not be exceeded in the application.
What are the typical applications for each device?
The 2920L185DR is typically used in lower-voltage, higher-current applications such as USB peripherals, portable electronics, and 5 V or 12 V power rails. The 2920L110/60MR is typically used in higher-voltage, lower-current applications such as industrial controls, telecom equipment, and 48 V power systems. Selection depends on the circuit's voltage and current requirements.
Do both devices have the same physical footprint and package size?
Yes, both the 2920L185DR and the 2920L110/60MR are supplied in the 2920 (inch) package size, which is approximately 7.98 mm × 5.44 mm. However, terminal finish, thickness, and recommended PCB land patterns may differ between manufacturers or series, so the specific datasheet must be consulted for exact dimensions and layout recommendations.
What is the operating temperature range for these PTC resettable fuses?
Both the 2920L185DR and the 2920L110/60MR are typically rated for an operating temperature range of -40°C to +85°C. Hold current and trip current are specified at 20°C and will derate at higher temperatures; the derating curves in the respective datasheets must be used for accurate design.
What are the time-to-trip characteristics of these devices?
Time-to-trip depends on the fault current and ambient temperature. The 2920L185DR, with a higher hold current, will generally trip faster at a given overcurrent multiple than the 2920L110/60MR. Exact time-to-trip curves are provided in the manufacturer datasheets and must be used to verify protection coordination.