B57236S0100M000V9 - 10Ω NTC Inrush Current Limiter | TDK | SMPS
MPN: B57236S0100M000V9 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.49 | $0.49 |
| 10 | $0.42 | $4.20 |
| 100 | $0.32 | $32.00 |
| 500 | $0.26 | $130.00 |
| 1,000 | $0.21 | $210.00 |
B57236S0100M000V9 Overview
An NTC (negative temperature coefficient) thermistor is a passive component whose resistance decreases as its body temperature rises. When a cold thermistor (high resistance) is placed in series with the AC line, it absorbs the initial capacitor-charging surge; once current flows and self-heats the ceramic body, resistance drops to a few hundred milliohms, leaving only a small steady-state power dissipation. NTC inrush limiters thus sit in the passive component family alongside resistors, capacitors and inductors, and serve as a dedicated safety-and-reliability subcategory of power-supply protection.
Key features of the B57236S0100M000V9 include a 10 Ω ±20% cold resistance, 3.5 A steady-state current capability, and a 0.453" (11.50 mm) lead spacing that fits industry-standard through-hole ICL footprints. The device carries UL (E338926), CQC, IEC 60539-1-1 (AT0002) and VDE 40038223 safety certifications, making it suitable for worldwide SMPS and industrial electronics deployments. Its leaded radial construction simplifies hand prototyping and rework compared to SMD alternatives.
The B57236S0100M000V9 uses a sintered metal-oxide NTC ceramic element optimized for high steady-state current handling and fast thermal response. As the body self-heats during steady-state operation, resistance falls to a low residual value, limiting continuous power loss to roughly 1 W at rated current; the trade-off is a finite cool-down period during which the limiter cannot absorb a second high-energy inrush. Designers must size the cold resistance to balance peak inrush against steady-state dissipation.
Typical applications include switch-mode power supplies, motor soft-start circuits, UPS input stages, welding inverter input protection, and any mains-powered equipment with large bulk electrolytic capacitors. The wide operating temperature range and certified safety approvals make it a robust choice for industrial and consumer electronics. Compared to fixed resistors or mechanical NTC thermistor assemblies, the integrated leaded package reduces PCB area and assembly cost while maintaining repeatable thermal characteristics across production lots.
When designing with this ICL, place it in series with the AC line ahead of the bridge rectifier and bulk capacitors, and verify the steady-state current (post-self-heating) does not exceed the 3.5 A rating under worst-case load. Add a bypass relay or PTC for repeated inrush events. According to the TDK datasheet, the device dissipates roughly 1 W at rated current after self-heating, so adequate airflow or lead spacing is essential for reliability.
This page synthesizes distributor pricing from DigiKey/Mouser/LCSC, drop-in alternatives from TDK's B57236 family, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for B57236S0100M000V9 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
B57236S0100M000
✅ Drop-In✓ In Stock
$0.1766 / Unit
View Datasheet →B57236S0500M000
✅ Drop-In📋 Reference alternative (not in catalog)
B57236S0250M000
✅ Drop-In📋 Reference alternative (not in catalog)
B57236S0160M000
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
B57236S0100M000V9 Specifications
| Component Type | NTC Inrush Current Limiter (ICL) |
| Manufacturer (Legacy) | EPCOS (now TDK) |
| Cold Resistance R25 | 10 Ω |
| Resistance Tolerance | ±20% |
| Maximum Steady-State Current | 3.5 A |
| Lead Pitch | 0.453" (11.50 mm) |
| Package Style | Radial Leaded (Through-Hole) |
| Mounting Type | Through-Hole |
| Application | Switch-Mode Power Supplies (SMPS) |
| UL Certificate | E338926 |
| CQC Certificate (China) | Yes |
| IEC 60539-1-1 Detail Spec | AT0002 |
| VDE Certificate | 40038223 |
| Lead Content (per TTI) | Contains Pb - reference ELV Directive 2000/53/EC and EU Decision 2002/525/EC |
| Terminal Finish | Tinned |
B57236S0100M000V9 Pin Configuration
| Pin 1 | Lead 1 — AC line in (non-polar) |
| Pin 2 | Lead 2 — AC line out to bridge rectifier (non-polar) |
Typical Applications
B57236S0100M000V9 is suitable for 6 applications: Switch-Mode Power Supply (SMPS) Input Protection, Industrial Motor Soft-Start, Uninterruptible Power Supply (UPS) Input Stage, Welding Inverter Input Protection, Audio Amplifier Power Supply, Industrial LED Driver Input Stage.
Switch-Mode Power Supply (SMPS) Input Protection
The B57236S0100M000V9 is purpose-built for switch-mode power supplies where large bulk electrolytic capacitors (typically 100-470 µF at 400 V) draw damaging inrush currents at AC mains turn-on. Placed in series with the AC line ahead of the bridge rectifier, the 10 Ω cold resistance limits the first half-cycle charging current to a safe level while the device itself self-heats. After a few seconds, the resistance drops to a few hundred milliohms, leaving under 1 W of steady-state dissipation - ideal for 100-500 W SMPS designs.
Recommended
Industrial Motor Soft-Start
Industrial motor drives and soft-start circuits use the B57236S0100M000V9 to absorb the inrush that occurs when motor windings and DC-link capacitors are first energized. The 3.5 A rating suits fractional-horsepower AC motors up to roughly 750 W, while the UL, VDE and CQC certifications permit deployment in factory-automation panels subject to worldwide safety audits. Compared to discrete PTC thermistor + resistor networks, the integrated NTC package reduces assembly cost and improves repeatability across production lots.
Recommended
Uninterruptible Power Supply (UPS) Input Stage
Online and line-interactive UPS systems rely on the B57236S0100M000V9 to protect their input rectifier and boost-PFC stage from capacitor-charging transients at AC restoration after a battery event. The 10 Ω cold resistance drops the peak inrush to a level compatible with 6 A or 10 A input fuses, while the 3.5 A steady-state rating covers the no-load float current of small (<1 kVA) UPS units. The radial leaded package simplifies hand-replacement in field service scenarios common to UPS maintenance.
Recommended
Welding Inverter Input Protection
Welding inverters and plasma cutters present extreme inrush conditions when the heavy filter capacitance of their input stages is energized across the arc-strike load. The B57236S0100M000V9's 10 Ω cold resistance and 3.5 A rating suppress the initial surge, while its high-temperature ceramic body tolerates the elevated ambient inside a welder enclosure. Designers often combine it with a relay bypass for continuous-duty operation above 3 A load, using the NTC only for the cold-start event.
Recommended
Audio Amplifier Power Supply
High-power Class-D and Class-AB audio amplifiers use the B57236S0100M000V9 to protect their toroidal-transformer-fed bulk capacitors from the inrush that would otherwise trip the mains breaker. A 10 Ω cold resistance reduces the half-cycle peak to a level compatible with 5 A slow-blow fuses typical in amplifier mains input. The NTC's low post-heating resistance contributes negligibly to amplifier damping factor, preserving audio quality.
Recommended
Industrial LED Driver Input Stage
Industrial-grade LED drivers operating from 230 VAC often include PFC front ends with several hundred microfarads of bulk capacitance. The B57236S0100M000V9's 10 Ω cold resistance limits the inrush at AC turn-on to safe levels for the bridge rectifier and PFC MOSFETs. The radial through-hole package and 0.453" lead pitch drop directly into standard ICL footprints on driver PCBs. UL, CQC, and VDE certifications support worldwide deployment of commercial lighting fixtures.
Recommended
Recommended Products Summary
Engineering reference data for B57236S0100M000V9 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | B57236S0100M000 | B57236S0500M000 | B57236S0250M000 | B57236S0160M000 |
|---|---|---|---|---|---|
| Package | Radial Leaded 0.453" (11.50 mm) | Radial Leaded 0.453" (11.50 mm) - same | Radial Leaded 0.453" (11.50 mm) - same | Radial Leaded 0.453" (11.50 mm) - same | Radial Leaded 0.453" (11.50 mm) - same |
| Brand | TDK (formerly EPCOS) | TDK - same | TDK - same | TDK - same | TDK - same |
| Cold Resistance R25 | 10 Ω ±20% | 10 Ω ±20% | 5 Ω ±20% | 2.5 Ω ±20% | 16 Ω ±20% |
| Max Steady-State Current | 3.5 A | 3.5 A | 3.5 A | 3.5 A | 3.5 A |
| Lead Pitch | 0.453" (11.50 mm) | 0.453" (11.50 mm) | 0.453" (11.50 mm) | 0.453" (11.50 mm) | 0.453" (11.50 mm) |
| Mounting Type | Through-Hole (Radial) | Through-Hole (Radial) | Through-Hole (Radial) | Through-Hole (Radial) | Through-Hole (Radial) |
| Application | SMPS inrush limiting | SMPS inrush limiting | SMPS inrush limiting (larger bulk) | SMPS inrush limiting (larger bulk) | SMPS inrush limiting (smaller bulk) |
| UL Certification | E338926 | E338926 | E338926 | E338926 | E338926 |
| Variant Suffix | V9 (packaging/lot variant) | None (base part) | None (base part) | None (base part) | None (base part) |
Key Differentiators
- Higher inrush limiting resistance than lower-ohm B57236 variants (vs B57236S0250M000)
- V9 suffix indicates distributor-specific packaging variant (vs B57236S0100M000)
- Lower cold resistance than higher-ohm B57236 variants (vs B57236S0160M000)
Design Notes
Estimated: At 3.5 A steady-state current and a residual hot resistance of ~150 mΩ, the B57236S0100M000V9 dissipates approximately P = I² × R = 3.5² × 0.15 ≈ 1.84 W after self-heating. Provide at least 10 mm of lead clearance to adjacent components and ensure ambient airflow keeps the body below 150 °C. For continuous operation above 2 A, consider the B57237 series (5 A rating) or add a relay bypass that shorts the NTC after the first 1-2 seconds.
Place the B57236S0100M000V9 in series with the AC line ahead of the bridge rectifier and bulk capacitors. Keep the device at least 5 mm away from the rectifier heatsink to avoid coupling heat back into the NTC element (which would prevent the part from cooling between inrush events). The 0.453" (11.50 mm) lead pitch is the B57236 industry-standard footprint; verify the hole diameter on your PCB matches the 0.8 mm typical lead diameter plus 0.2 mm clearance.
The B57236S0100M000V9 contains Pb in its terminal material (per TTI's part detail, referenced to JEDEC JESD97 and EU ELV Directive 2000/53/EC). For RoHS-compliant designs, specify the appropriate RoHS ordering code variant from TDK. Also note the cool-down requirement: the NTC cannot absorb a second high-energy inrush until it has cooled back to near-ambient, typically 30-60 seconds. For applications with rapid power cycling, add a PTC thermistor in parallel or a mechanical bypass relay.
Compliance Information
Contains Pb in terminal material per TTI part detail (JEDEC JESD97 paragraph 3.5, EU ELV Directive 2000/53/EC, EU Decision 2002/525/EC Annex II). UL E338926, CQC, IEC 60539-1-1 AT0002, IECQ 101-QA-12, VDE 40038223 certifications per TDK product page. Not AEC-Q100 qualified - this is a passive component for industrial/consumer electronics, not automotive grade.
