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 2920L075/60MR and 2920L500/16MR are both 2920-size PPTC resettable fuses, but they are not functionally interchangeable. The 2920L075/60MR is rated for higher voltage with lower hold current, while the 2920L500/16MR is rated for lower voltage with substantially higher hold current. Their trip characteristics, resistance values, and time-to-trip behavior differ significantly, making direct substitution unsuitable without circuit redesign and validation.
Different voltage rating
Different current rating
Different trip characteristics
Different resistance profile
Parts at a glance
Part B
2920L075/60MR
Littelfuse sa.
- Lifecycle
- Active
- Stock
- 4392 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 | 2920L075/60MR | 2920L500/16MR | Why it matters |
|---|---|---|---|
| Hold Current (Ih) | 0.75 A | 5.0 A | Defines the maximum continuous current the device passes without tripping; a large mismatch means the parts are not functionally interchangeable for a given load. |
| Trip Current (It) | 1.5 A | 10.0 A | Determines the current at which the device reliably switches to its high-resistance state, directly affecting overcurrent protection thresholds. |
| Maximum Voltage Rating (Vmax) | 60 V | 16 V | Sets the highest voltage the device can safely withstand while tripped; using a lower-rated part in a higher-voltage circuit risks failure. |
| Maximum Interrupt Current (Imax) | 10 A | 100 A | Indicates the largest fault current the device can interrupt safely; insufficient rating can lead to device damage or safety hazards. |
| Initial Resistance (Rmin / Rmax) | 0.30 Ω / 0.90 Ω | 0.010 Ω / 0.030 Ω | Affects voltage drop and power dissipation in normal operation; a higher-resistance part may cause excessive loss in low-voltage, high-current rails. |
| Time to Trip at Rated Current | 0.30 s at 3.75 A | 2.0 s at 25 A | Defines the response speed under fault conditions; slower trip times may not protect sensitive downstream components. |
| Power Dissipation (Typical Tripped) | 1.5 W | 2.4 W | Impacts thermal design and PCB layout; higher dissipation requires more copper area or thermal relief. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Ensures both parts function across the same environmental conditions, which is critical for automotive and industrial applications. |
| Package / Footprint | 2920 (7351 metric) | 2920 (7351 metric) | Identical footprints allow direct PCB drop-in replacement without layout changes, though electrical ratings still differ. |
| Mounting Type | Surface Mount | Surface Mount | Confirms both are SMD devices compatible with reflow assembly processes, but does not address electrical substitutability. |
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 | 2920L500/16MR | 2920L075/60MR |
|---|---|---|
| Series | POLY-FUSE®, 2920L | POLY-FUSE®, 2920L |
| Part Status | Active | Active |
| Type | Polymeric | Polymeric |
| Voltage - Max | 16V | 60V |
| Current - Max | 40 A | 10 A |
| Current - Hold(Ih)(Max) | 5 A | 750 mA |
| Current - Trip(It) | 10 A | 1.5 A |
| Timeto Trip | 5 s | 300 ms |
| Resistance - Initial(Ri)(Min) | 5 mOhms | 300 mOhms |
| Resistance - Post Trip(R1)(Max) | 25 mOhms | 950 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 (7.35mm x 5.12mm) |
| Thickness(Max) | 0.063 (1.60mm) | 0.049 (1.25mm) |
Frequently asked questions
What are the key differences between the 2920L075/60MR and the 2920L500/16MR?
The 2920L075/60MR is a 60 V, 0.75 A hold current PPTC resettable fuse, while the 2920L500/16MR is a 16 V, 5.00 A hold current device. They share the same 2920 (inch) / 7550 (metric) footprint but differ in voltage rating, hold current, trip current, and maximum interrupt current.
Can the 2920L075/60MR and 2920L500/16MR be used interchangeably?
No. Their voltage ratings and current characteristics differ significantly. The 2920L075/60MR is rated for higher voltage but lower current, while the 2920L500/16MR is rated for lower voltage but higher current. Substitution requires full validation against the target circuit's voltage, current, and trip requirements.
What is the hold current of each device?
The 2920L075/60MR has a hold current of 0.75 A at 20°C, and the 2920L500/16MR has a hold current of 5.00 A at 20°C. Hold current is the maximum current the device will pass without tripping under specified ambient conditions.
What is the maximum voltage rating of each device?
The 2920L075/60MR is rated at 60 V (DC), and the 2920L500/16MR is rated at 16 V (DC). The voltage rating must not be exceeded in the application.
What is the trip current of each device?
The 2920L075/60MR has a trip current of 1.50 A at 20°C, and the 2920L500/16MR has a trip current of 10.0 A at 20°C. Trip current is the minimum current at which the device will switch to its high-resistance state under specified conditions.
What is the maximum interrupt current for each device?
The 2920L075/60MR has a maximum interrupt current of 40 A, and the 2920L500/16MR has a maximum interrupt current of 100 A. This is the highest fault current the device can safely interrupt at its rated voltage.
Do both devices share the same package and footprint?
Yes. Both the 2920L075/60MR and 2920L500/16MR are supplied in the 2920 (inch) / 7550 (metric) package, which is approximately 7.5 mm × 5.0 mm. However, electrical differences prevent direct substitution without circuit redesign validation.
What are the typical applications for each device?
The 2920L075/60MR is typically used in higher-voltage, lower-current circuits such as telecom and industrial equipment. The 2920L500/16MR is typically used in lower-voltage, higher-current circuits such as USB power delivery, battery packs, and portable electronics. Application suitability must be verified against the specific circuit requirements.