MF72-010D7 - 10Ω 1A Power NTC Thermistor Inrush Limiter | Cantherm
Teilenummer: MF72-010D7 ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $0.37 | $0,37 |
| 10 | $0.33 | $3,30 |
| 100 | $0.28 | $28,00 |
| 500 | $0.24 | $120,00 |
| 1.000 | $0.2 | $200,00 |
| 5.000 | $0.17 | $850,00 |
MF72-010D7 Übersicht
An NTC thermistor is a semiconductor passive component whose resistance decreases as temperature rises. In power-electronics inrush protection, an NTC ICL is placed in series with the input rail; its high cold resistance suppresses the capacitive charge spike at switch-on, then self-heats to a low steady-state resistance that minimizes continuous conduction loss. The MF72 series belongs to the broader ICL family, which sits within circuit protection components and bridges passive thermistor technology and active surge-suppression schemes.
Key features include a 10 Ω cold resistance (R25), 0.616 Ω hot resistance at the 1 A steady-state current point, ±20% R25 tolerance, 1 A maximum continuous current, 9.0 mm disc diameter, 5.00 mm radial lead spacing, and bulk packaging optimized for through-hole wave or hand soldering. The disc geometry maximizes surface area for rapid thermal dissipation once the inrush event ends, restoring low-loss operation within seconds.
Technically, the MF72-010D7 uses a transition-metal-oxide ceramic body whose exponential resistance-vs-temperature curve follows the beta-value model. Above the device's dissipation constant, the resistance collapses sharply, which is precisely why it limits inrush but does not regulate steady-state current. Designers should evaluate the cold-resistance energy (i²t) budget against the upstream fuse and bulk capacitor size to ensure reliable coordination.
Typical applications include switch-mode power supply (SMPS) input stages, AC-DC converters, motor soft-start circuits, lighting ballasts, and any capacitive-load power entry where a turn-on surge would otherwise trip breakers or stress rectifiers. The 10 Ω cold value suits supplies in the 5 W to 30 W class.
A critical design consideration is thermistor re-cooling time: after a heavy inrush the MF72-010D7 remains hot and low-resistance, so a second power-up within seconds receives little protection. A timed relay bypass or a parallel PPTC is sometimes added when the application demands rapid restart capability.
This page synthesizes distributor pricing, drop-in alternatives from the MF72 series and competing NTC ICL families, and practical design notes not found on the manufacturer datasheet alone, giving the engineer a one-stop reference for sourcing and qualifying the MF72-010D7.
Drop-in-Alternativen für MF72-010D7 – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
MF72-005D7
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
MF72-020D7
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
MF72-030D7
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
MF72-2R510D7
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
SL12-10009
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
B57153S0100M+9
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
MF72-010D7 Grenzwerte & elektrische Eigenschaften
| Component Type | Power NTC Thermistor (Inrush Current Limiter, ICL) |
| Resistance @ 25°C (R25) | 10 Ω |
| R25 Tolerance | ±20% |
| Steady-State Maximum Current | 1 A |
| Resistance @ Rated Current | 0.616 Ω (at 1 A) |
| Disc / Body Diameter | 9.0 mm (0.354 in) |
| Lead Spacing | 5.00 mm (0.197 in) |
| Lead Style | Radial, through-hole |
| Montageart | Through Hole |
| Betriebstemperatur | -40 C to +200 C (per MF72 family convention) |
| Packaging | Bulk |
| Lead-Free Status | Lead Free (per distributor listing) |
| RoHS-Status | Compliant (per distributor listing) |
MF72-010D7 standard Pinbelegungsleitfaden
Pinbelegung für MF72-010D7 (standard-Gehäuse). Pin-Nummerierung, Funktionen und Anschlussdiagramme sind im Herstellerdatenblatt definiert. Entnehmen Sie diesem den genauen Footprint und Lötrichtlinien.
Keine detaillierten Pinbelegungsdaten verfügbar für MF72-010D7.
Siehe die Datenblatt für die vollständige Pin-Konfiguration.
Typische Anwendungen
MF72-010D7 ist geeignet für 6 Anwendungs: Switch-Mode Power Supply (SMPS) Input Stage, AC-DC Converter Front-End Protection, DC Motor Soft-Start Circuit, Lighting Ballast and LED Driver Input, Capacitive Load Power Entry Modules, Audio Amplifier Soft-Start Protection.
Switch-Mode Power Supply (SMPS) Input Stage
The MF72-010D7 is placed in series with the AC rectified rail of small to mid-size SMPS, where its 10 Ω cold resistance suppresses the initial capacitor-charge inrush while its 0.616 Ω hot resistance at 1 A keeps continuous conduction loss near 0.6 W. At a 100 µF to 470 µF bulk capacitor and 230 VAC input, the inrush can exceed 100 A without limiting; the MF72-010D7 typically clips this to 20 A to 30 A peak, extending rectifier and fuse life. Choose this part for 5 W to 30 W adapters where the 1 A continuous rating covers the steady-state draw with margin.
Empfohlen
AC-DC Converter Front-End Protection
In offline AC-DC converters the MF72-010D7 sits between the bridge rectifier and the bulk capacitor, absorbing the turn-on surge that would otherwise trigger the input fuse or stress the rectifier diodes. The 10 Ω cold resistance and 9 mm disc geometry give enough i²t headroom for universal-input 85 VAC to 265 VAC designs. Once the converter is running, the part stays warm and contributes negligible loss; on power-down the part re-cools within seconds and is ready for the next cycle.
Empfohlen
DC Motor Soft-Start Circuit
For 24 V brushed DC motors drawing under 1 A continuous, the MF72-010D7 in series with the supply prevents the locked-rotor current spike from tripping the supply's current limit at start. Its resistance drops as the motor begins to spin and back-EMF develops, settling to roughly 0.6 Ω for efficient running. For motors drawing more than 1 A continuous or with very high locked-rotor currents, step up to a larger-diameter NTC ICL with higher steady-state current. Always check re-cooling time if the motor is duty-cycled with rapid on-off patterns.
Empfohlen
Lighting Ballast and LED Driver Input
Fluorescent ballasts and high-power LED drivers contain large electrolytic banks that draw destructive inrush at turn-on. The MF72-010D7's 10 Ω cold resistance is a good match for 20 W to 40 W LED driver front-ends, limiting the capacitor-charge spike to within the rectifier's non-repetitive rating. The 1 A continuous rating covers most residential LED drivers and small commercial ballasts. Verify the steady-state driver current stays below 1 A with sufficient margin (typically 80% derating) for long-term reliability.
Empfohlen
Capacitive Load Power Entry Modules
Industrial power-entry modules feeding multiple downstream DC-DC converters often present a large cumulative bulk capacitance to the source. Placing an MF72-010D7 at the module input limits the combined turn-on surge that would otherwise trip upstream protection. The 9 mm disc and 5.00 mm lead spacing match standard power-entry PCB footprints. Pair with a downstream PPTC or fuse for full overcurrent coordination across the entire load range.
Empfohlen
Audio Amplifier Soft-Start Protection
Class-D and high-power linear audio amplifiers contain large bulk capacitors on the supply rail that draw a heavy inrush at power-on. The MF72-010D7 placed in series with the main supply rail limits this surge, preventing nuisance tripping of the upstream fuse and reducing stress on rectifier diodes. Once the amplifier is running, the part's low hot resistance contributes negligible voltage drop, preserving audio performance. For higher-power amplifiers above 1 A continuous, step up to a larger NTC ICL from the MF72 family with a higher current rating.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für MF72-010D7 – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | MF72-005D7 | MF72-020D7 | MF72-030D7 | MF72-2R510D7 | SL12-10009 | B57153S0100M+9 |
|---|---|---|---|---|---|---|---|
| Package | 9 mm radial disc, 5.00 mm lead spacing | 9 mm radial disc, 5.00 mm lead spacing - same | 9 mm radial disc, 5.00 mm lead spacing - same | 9 mm radial disc, 5.00 mm lead spacing - same | 9 mm radial disc, 5.00 mm lead spacing - same | 9 mm radial disc, 5.00 mm lead spacing - same | 9 mm radial disc, 5.00 mm lead spacing - same |
| Brand | Cantherm | Cantherm | Cantherm | Cantherm | Cantherm | Ametherm | TDK |
| R25 Cold Resistance | 10 Ω | 5 Ω | 20 Ω | 30 Ω | 2.5 Ω | 10 Ω | 10 Ω |
| R25 Tolerance | ±20% | ±20% | ±20% | ±20% | ±20% | ±20% | ±20% |
| Steady-State Current | 1 A | 1 A | 1 A | 1 A | 2 A | 1 A | 1 A |
| Disc Diameter | 9.0 mm | 9.0 mm | 9.0 mm | 9.0 mm | 9.0 mm | 9.0 mm | 9.0 mm |
| Lead Spacing | 5.00 mm | 5.00 mm | 5.00 mm | 5.00 mm | 5.00 mm | 5.00 mm | 5.00 mm |
| RoHS / Lead-Free | Yes / Yes | Yes / Yes | Yes / Yes | Yes / Yes | Yes / Yes | Yes / Yes | Yes / Yes |
Wichtigste Unterscheidungsmerkmale
- Industry-standard 9 mm / 5.00 mm footprint with multiple cold-resistance options (vs. MF72-010D5 (5 mm disc))
- Lower hot resistance than fixed-resistor inrush schemes (vs. Fixed 10 Ω wirewound resistor)
- Drop-in compatibility with major cross-brand NTC ICL lines (vs. SL12-10009 (Ametherm) and B57153S0100M+9 (TDK))
Designhinweise
At the 1 A steady-state rating the MF72-010D7 dissipates roughly 0.6 W (I²R using the 0.616 Ω hot resistance). With a typical MF72-series dissipation constant of 12 to 15 mW/°C, this drives the part roughly 40 °C to 50 °C above ambient in still air. Provide at least 10 mm of lead length for heat conduction into the PCB copper and avoid placing the part adjacent to other heat sources. In enclosed adapters, derate to 0.7 A continuous or step up to a higher-diameter part.
Mount the MF72-010D7 directly in series with the AC rectified rail, ahead of the bulk capacitor and any EMI filter chokes. Keep the trace between the bridge and the thermistor short so the inrush is limited at its source rather than after any filter inductance. Use 1 oz copper minimum on the input traces and provide a copper pour under the part as a heat-spreader; the radial leads are mechanically robust but should not carry the device weight when mounted horizontally.
After a heavy inrush the MF72-010D7 remains hot and at low resistance, so a power-cycle within seconds receives little inrush protection. Estimate: re-cooling time for a 9 mm disc is roughly 30 s to 90 s in still air depending on the lead thermal path. If your application demands rapid restart, add a timed relay short across the thermistor or use an NTC+PPTC combination. Also, do not place the MF72-010D7 downstream of a fuse rated below the inrush peak - the fuse will trip first and the thermistor will not have protected anything.
Do not select the MF72-010D7 solely by cold-resistance value; verify the steady-state current rating against continuous load with at least 20% margin, and confirm the hot resistance at rated current does not cause excessive supply sag. For a 1 A continuous load the 0.616 Ω hot resistance produces 0.6 V drop; in 5 V logic supplies this is significant, so consider a lower-R25 part such as MF72-2R510D7 if supply tolerance is tight.
Compliance-Informationen
RoHS and Lead-Free confirmed by distributor listing (DigChip). REACH, halogen-free, and conflict-minerals status not stated in distributor extracts - verify with manufacturer datasheet or contact Cantherm for full material declaration. Not AEC-Q100 qualified (automotive grade is not applicable for through-hole passive ICLs of this type).
