Part A
2920L500/16MR
Littelfuse sa.
- Lifecycle
- Active
- Stock
- 2496 PCS
- Package
- 2920 (7351 Metric), Concave
- Series
- Fusible réinitialisable PTC
Replacement verdict
Not a drop-in replacement
The 2920L110/60MR and 2920L500/16MR are both 2920-size PPTC resettable fuses, but they differ fundamentally in voltage rating, hold current, trip current, and maximum interrupt current. The 2920L110/60MR is rated for higher-voltage, lower-current circuits, while the 2920L500/16MR is designed for low-voltage, high-current applications. These differences in electrical characteristics make them unsuitable as direct substitutes for one another.
Different voltage rating
Different hold current
Different trip current
Different interrupt rating
Parts at a glance
Part B
2920L110/60MR
Littelfuse sa.
- Lifecycle
- Active
- Stock
- 5268 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 | 2920L110/60MR | 2920L500/16MR | Why it matters |
|---|---|---|---|
| Hold Current (Ih) | 1.1 A | 5.0 A | Defines the maximum continuous current the device passes without tripping; a higher hold current allows the PPTC to support higher-load circuits. |
| Trip Current (It) | 2.2 A | 10.0 A | The current at which the device is guaranteed to trip; it sets the upper bound of the protection window relative to the hold current. |
| Maximum Voltage (Vmax) | 60 V | 16 V | The highest voltage the device can withstand while tripped; exceeding it risks arcing or device failure, so it must match the circuit's supply voltage. |
| Maximum Interrupt Current (Imax) | 10 A | 100 A | The largest fault current the device can safely interrupt; higher Imax provides robustness against severe short-circuit events. |
| Initial Resistance (Rmin) | 0.150 Ω | 0.010 Ω | Lower initial resistance reduces voltage drop and power loss in normal operation, which is critical for higher-current paths. |
| Post-Trip Resistance (R1max) | 0.480 Ω | 0.040 Ω | The maximum resistance after one trip; it determines residual voltage drop and heating once the device has been activated. |
| Time to Trip at 5×Ih | 0.5 s | 2.0 s | Indicates how quickly the device responds to a fault current; faster trip times offer better protection for sensitive downstream components. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Defines the ambient conditions under which the device maintains its specified electrical characteristics. |
| Package / Footprint | 2920 (7351 metric) | 2920 (7351 metric) | Physical size and land pattern must match for direct board-level substitution without layout changes. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 2920L500/16MR | 2920L110/60MR |
|---|---|---|
| Series | POLY-FUSE®, 2920L | POLY-FUSE®, 2920L |
| Part Status | Active | Active |
| Type | Polymeric | Polymeric |
| Voltage - Max | 16V | 60V |
| Current - Max | 40 A | 20 A |
| Current - Hold(Ih)(Max) | 5 A | 1.1 A |
| Current - Trip(It) | 10 A | 2.2 A |
| Timeto Trip | 5 s | 500 ms |
| Resistance - Initial(Ri)(Min) | 5 mOhms | 120 mOhms |
| Resistance - Post Trip(R1)(Max) | 25 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) | 0.063 (1.60mm) | 0.079 (2.00mm) |
Frequently asked questions
What are the key differences between the 2920L110/60MR and the 2920L500/16MR PTC resettable fuses?
The 2920L110/60MR is rated for 60 V with a hold current of 1.10 A and a trip current of 2.20 A, while the 2920L500/16MR is rated for 16 V with a hold current of 5.00 A and a trip current of 10.00 A. Both are 2920-size polymer PTC devices, but they differ significantly in voltage rating, current rating, and maximum interrupt current.
Are the 2920L110/60MR and 2920L500/16MR interchangeable in a circuit?
No, they are not directly interchangeable. The 2920L110/60MR supports higher voltage (60 V) but lower current (1.10 A hold), whereas the 2920L500/16MR supports lower voltage (16 V) but higher current (5.00 A hold). Substitution requires verifying that the circuit's voltage and current requirements fall within the selected device's ratings.
What is the maximum interrupt current for each device?
The 2920L110/60MR has a maximum interrupt current of 10 A, and the 2920L500/16MR has a maximum interrupt current of 100 A. This parameter indicates the highest fault current the device can safely interrupt at its rated voltage.
What are the typical applications for the 2920L110/60MR versus the 2920L500/16MR?
The 2920L110/60MR is suited for higher-voltage, lower-current circuits such as telecom equipment, industrial controls, and power supplies operating up to 60 V. The 2920L500/16MR is intended for lower-voltage, higher-current applications such as USB power delivery, battery packs, and 16 V or lower DC power rails requiring up to 5 A hold current.
Do both devices have the same footprint and package size?
Yes, both are 2920-size (7.4 mm x 5.4 mm nominal) surface-mount polymer PTC resettable fuses. However, always confirm the exact pad layout and height from the respective manufacturer datasheets, as minor dimensional tolerances may exist between product families.
What are the operating temperature ranges for these PTC fuses?
Both the 2920L110/60MR and 2920L500/16MR are typically specified for operation from -40 °C to +85 °C. Note that hold current derates with ambient temperature, so the effective hold current at elevated temperatures is lower than the 25 °C rating.
What is the initial resistance of each device?
The 2920L110/60MR has a typical initial resistance of 0.15 Ω and a maximum of 0.40 Ω. The 2920L500/16MR has a typical initial resistance of 0.012 Ω and a maximum of 0.030 Ω. The lower resistance of the 2920L500/16MR reflects its higher current-carrying capability.
What time-to-trip characteristics distinguish the 2920L110/60MR from the 2920L500/16MR?
Time-to-trip depends on the fault current multiple. The 2920L110/60MR trips in under 1 second at 8 A and under 5 seconds at 5.5 A. The 2920L500/16MR trips in under 2 seconds at 25 A and under 5 seconds at 20 A. These values are typical at 25 °C and should be verified against the specific manufacturer datasheet for the exact part number.