SL22 20007-B AMETHERM Thermistor (Other) In Stock
AMETHERM SL22 20007-B is a 22 mm NTC inrush current limiter thermistor rated at 20 ohms and 7 A steady-state current, protecting power supplies from damaging turn-on current spikes. From $1.50 in stock worldwide shipping.
- Manufacturer
- AMETHERM
- Package
- Other
- Pin Count
- 2
- Lifecycle
- ACTIVE
- Datasheet
- SL22 20007-B Datasheet PDF
- Category
- Thermistor
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 20 ohm resistance at 25°C effectively limits inrush current spikes to safe levels during power-on transients
- 7 A steady-state current rating handles continuous load in AC/DC power supplies and motor drives
- 22 mm body diameter provides high thermal mass for superior energy absorption during repeated power cycles
- Kink-lead (B variant) termination enables secure through-hole PCB mounting for vibration-resistant installations
Applications
The SL22 20007-B NTC inrush current limiter is used in AC/DC switching power supplies, variable frequency motor drives, and UPS systems to suppress destructive turn-on current surges that can exceed 50 A without protection. Its 20 ohm cold resistance reduces initial inrush current while the NTC characteristic allows resistance to drop as it self-heats to steady-state, minimizing power dissipation during normal operation at up to 7 A. This thermistor is also commonly deployed in industrial HVAC equipment, medical imaging power supplies, and LED driver circuits requiring IEC 61000-3-2 harmonic compliance.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What resistance and current rating does the SL22 20007-B provide for inrush current limiting?
The SL22 20007-B has a cold resistance of 20 ohms at 25°C and a steady-state current rating of 7 A, which together limit inrush current at power-on to safe levels while allowing full rated current flow once the NTC thermistor heats up and its resistance drops significantly during normal operation.
How does the NTC behavior of SL22 20007-B help minimize power loss after startup in a power supply design?
As an NTC (Negative Temperature Coefficient) thermistor, the SL22 20007-B self-heats from its initial 20 ohm resistance to below 1 ohm at operating temperature, dropping power dissipation from potentially 10 W at startup to less than 0.5 W at 7 A steady-state, improving overall power supply efficiency after inrush suppression.
In which industrial power applications is the 22 mm body size of SL22 20007-B an advantage over smaller thermistors?
The 22 mm body provides greater thermal mass than 10 mm or 15 mm thermistors, enabling the SL22 20007-B to absorb higher inrush energy during repeated power cycling — up to 60 joules per cycle — making it better suited for motor drives, welding equipment, and industrial servo controllers that cycle on and off multiple times per hour.
Does the SL22 20007-B kink-lead (B) variant offer any mechanical advantage over straight-lead NTC thermistors in PCB assembly?
Yes, the kink-lead B variant features bent lead terminations that mechanically lock the 22 mm thermistor body against the PCB surface before soldering, preventing movement during wave or manual soldering and ensuring consistent lead insertion depth for repeatable through-hole solder joint quality in automated production.
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