SL1024B500R Gas Discharge Tube - Equivalent & Substitute Parts

Part Overview

The SL1024B500R is a 3-pole gas discharge tube (GDT) rated for 500V DC spark-over voltage with 20kA impulse discharge current capacity. Designed for through-hole mounting in axial cylinder configuration, this component is used for transient overvoltage protection in telecommunications, power distribution, and industrial control applications.

The SL1024B500R is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or field replacement requirements.

Substiute Parts

SL1024B500R

Littelfuse Inc.In Stock: 709SL1024B500R Datasheet

Current PartRFQ

SL1021B500R

Littelfuse Inc.In Stock: 1769SL1021B500R Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SL1024B500R is determined by strict equivalence across the following critical parameters:

• Voltage Rating: 500 V DC spark-over voltage (nominal)
• Discharge Current Capacity: 20000 A (20 kA) at 8/20µs impulse waveform
• Pole Configuration: 3-pole architecture
• Mounting and Package: Through-hole axial cylinder with 3 radial leads
• Fail Mode: Non-shorting characteristic
• Environmental Compliance: ROHS3 compliance and MSL 1 rating

The SL1021B500R meets all these criteria and is classified as an active product from the same manufacturer (Littelfuse Inc.), making it a direct functional equivalent suitable for replacement applications.

Parameter Comparison

Engineering Selection Recommendations

The SL1021B500R is the appropriate substitute for the obsolete SL1024B500R based on the following factors:

Electrical Equivalence: Both parts share identical voltage ratings (500 V DC spark-over) and discharge current capacity (20 kA at 8/20µs), ensuring equivalent protection performance in overvoltage suppression circuits.

Mechanical Compatibility: Package geometry, lead configuration, and through-hole mounting characteristics are identical, allowing direct PCB footprint compatibility without layout modifications.

Compliance and Certification: Both parts maintain ROHS3 compliance and MSL 1 rating, satisfying environmental and reliability requirements for industrial and telecommunications applications.

Product Availability: The SL1021B500R is classified as active product status, ensuring ongoing supply chain availability and manufacturing support, whereas the SL1024B500R is obsolete.

Frequently Asked Questions (FAQ)

Q: Can the SL1021B500R be used as a direct replacement for the SL1024B500R in existing designs?

A: Yes. The SL1021B500R is electrically and mechanically equivalent to the SL1024B500R. All critical parameters—voltage rating, discharge current capacity, pole configuration, and package geometry—are identical. No circuit modifications or PCB redesign is required.

Q: What is the difference between the SL1024B and SL1021B series?

A: Both series are 3-pole gas discharge tubes rated for 500 V and 20 kA discharge current. The primary distinction is product status: SL1024B is obsolete, while SL1021B is active. The SL1021B represents the current production equivalent.

Q: Are there any packaging differences between these parts?

A: The SL1024B500R is supplied in standard packaging, while the SL1021B500R is supplied in tray packaging. Both use identical axial cylinder, 3-lead radial bend package geometry. Tray packaging is standard for active production parts and does not affect electrical or mechanical performance.

Q: Do both parts meet the same environmental and compliance standards?

A: Yes. Both the SL1024B500R and SL1021B500R are ROHS3 compliant with MSL 1 (unlimited moisture sensitivity level), meeting the same environmental and reliability standards.

Q: What applications are these gas discharge tubes suitable for?

A: These 500 V, 20 kA 3-pole GDTs are designed for transient overvoltage protection in telecommunications equipment, power distribution systems, industrial control circuits, and similar applications requiring multi-pole surge suppression.