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ST40002B

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ST40002B

ST40002B

$0.65
  • Description：ICL 40 OHM 20% 2A 18.42MM
  • Series：ST
  • Mfr：Littelfuse Inc.
  • Package：Bulk

SKU:66b9a24e0985 Category: Brand:

　　
  • Quantity
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Product Detailed Parameters

  • Description：ICL 40 OHM 20% 2A 18.42MM
  • Series：ST
  • Mfr：Littelfuse Inc.
  • Package：Bulk
  • R @ 25°C：40 Ohms
  • Tolerance：±20%
  • Current - Steady State Max：2:00 AM
  • R @ Current：600 mOhms
  • Diameter：0.725" (18.42mm)
  • Lead Spacing：0.310" (7.87mm)
  • Grade：-
  • Qualification：-
  • Approval Agency：-

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ST40002B

How to buy
Online and offline orders are supported. If the item is available for online purchase, you can place it in the cart; for wholesale pricing, please contact our product manager for a quote.
Payment Method
Payment methods: T/T, WeChat Pay, credit cards, Google Pay, Apple Pay . Buyer covers shipping, fees, duties, and taxes; contact our product manager if you need a contract/procurement process.
Delivery time
In-stock items usually ship within 24 hours. Otherwise, shipment is arranged 1 to 2 days after the items arrive at our warehouse. Timing depends on destination and shipping method.
Freight calculation
Freight cost depends on destination, package size, and weight . We offer shipping options via DHL, FedEx, UPS, and TNT , and can ship using your freight account upon request.
Mode of Transportation
We ship via DHL, FedEx, UPS, and TNT. If you prefer a specific logistics provider, we can ship using your designated carrier.
Return and Refund
Returns are accepted within 60 days of invoice with RMA approval. Items must be resalable; original invoice and test report are required. No returns for customer errors.

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Buying Guide
Summary

Littelfuse Inc. ST40002B is a component in Inrush Current Limiters (ICL) category typically evaluated for fit, operating limits, and supportability in production. Key specs include Description (ICL 40 OHM 20% 2A 18.42MM), Series (ST), and Packaging (Bulk).

Selection Notes
  • For ST40002B, make sure Diameter (0.725" (18.42mm)) aligns with your design targets and verification plan.
  • Verify the tolerance (±20%) meets your specification across operating conditions.
  • Verify R @ Current (600 mOhms) matches your requirements and the datasheet test conditions.
  • Confirm Current - Steady State Max (2:00 AM) meets your design constraints and system-level expectations.
Alternates & Substitutions
  • For Inrush Current Limiters (ICL), compare the datasheet test conditions behind key specs and re-check the margins that were tightest during bring-up.
  • When evaluating alternates, treat packaging Bulk as non-negotiable unless you are re-spinning the PCB.
  • If you are qualifying a second source, align documentation/traceability requirements early to avoid surprises in procurement.
  • If you already have candidate alternates, share them and we will check the key drop-in risks before you buy.
FAQ

What R @ 25°C is listed for ST40002B?
40 Ohms

What is the Tolerance of ST40002B?
±20%

Which Current - Steady State Max is listed for ST40002B?
2:00 AM

How is ST40002B packaged?
Bulk

Application Scenarios

In many Inrush Current Limiters (ICL) builds, Littelfuse Inc. ST40002B is reviewed for predictable behavior, supportability, and stable qualification evidence. They keep abnormal events bounded by coordinating fusing, suppression, and thermal mechanisms into predictable responses. Selection depends on response time, let-through energy, surge rating, leakage, and coordination with upstream supplies and wiring. Across telecom and networking, protection reduces downtime from cable faults in always-on racks. In practice, within industrial equipment, inrush control reduces nuisance trips and contact wear when loads are switched repeatedly in noisy mains environments. Across power distribution, limiting peak current improves reliability of upstream supplies and wiring harnesses during brownouts and restart events.

Compatibility Advice
  • To reduce integration risk, confirm placement and return-path strategy so protection engages at the entry point rather than after stress propagates through the board across temperature and supply corners.
  • Verify that service procedures keep the safety state deterministic during field replacement and reassembly before committing to volume builds.
Project Fit
  • Works best when you can bench-verify Littelfuse Inc. ST40002B for Inrush Current Limiters (ICL) integration with the real wiring and cabling, and you need predictable startup behavior and can validate inrush and heating under worst-case cold start.
ST40002BST40002B
$0.65
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