SH470 Gas Discharge Tube - Equivalent & Substitute Parts

Part Overview

The SH470 is a 2-pole surface mount gas discharge tube (GDT) manufactured by Littelfuse Inc., designed for overvoltage protection applications. It features a 470V DC spark-over voltage rating and 5000A (5kA) impulse discharge current capacity. The component is currently in active production status with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Alternative equivalent parts may be required due to inventory availability, supply chain considerations, or specific application requirements.

Substiute Parts

SH470

Littelfuse Inc.In Stock: 1398SH470 Datasheet

Current PartRFQ

2035-47-SM-RPLF

Bourns Inc.In Stock: 74102035-47-SM-RPLF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Equivalent substitution for the SH470 is based on strict electrical and mechanical parameter matching. The substitute part 2035-47-SM-RPLF from Bourns Inc. qualifies as a direct equivalent because it maintains all critical parameters:

• Voltage - DC Spark Over (Nominal): 470 V (exact match)
• Impulse Discharge Current (8/20µs): 5000A (5kA) (exact match)
• Number of Poles: 2 (exact match)
• Mounting Type: Surface Mount (exact match)
• Fail Short: No (exact match)
• RoHS Status: ROHS3 Compliant (equivalent compliance)
• Moisture Sensitivity Level (MSL): 1 (Unlimited) (exact match)

The substitute part features a tolerance specification of ±15% on spark-over voltage, which is an additional parameter not specified in the main part. Both components are in active production status and meet identical regulatory requirements.

Parameter Comparison

Engineering Selection Recommendations

Both the SH470 and 2035-47-SM-RPLF are active production components with identical regulatory compliance profiles. Selection between these parts should be based on:

• Availability and lead time requirements
• Inventory status (SH470: 1369 pcs; 2035-47-SM-RPLF: 7340 pcs)
• Manufacturer preference or qualification requirements
• PCB footprint compatibility with the specific package variant (Square End Block vs. Cylinder Square End)
• Cost considerations

Both components meet ROHS3, REACH, and EAR99 requirements, making them suitable for equivalent circuit protection applications without regulatory differentiation.

Frequently Asked Questions (FAQ)

Q: Can the 2035-47-SM-RPLF directly replace the SH470 on a PCB?

A: Yes, both components are 2-pole surface mount gas discharge tubes with identical electrical ratings (470V spark-over, 5kA impulse current). However, verify PCB footprint compatibility, as the package variants differ slightly (Square End Block vs. Cylinder Square End). Both are 2-SMD configurations suitable for surface mount assembly.

Q: What is the significance of the ±15% tolerance specification on the substitute part?

A: The 2035-47-SM-RPLF specifies a ±15% tolerance on the DC spark-over voltage, meaning the actual spark-over voltage will fall between 399.5V and 540.5V. The SH470 does not specify a tolerance value. Both parts maintain the 470V nominal rating and are functionally equivalent for circuit protection purposes.

Q: Are there any differences in failure mode between these parts?

A: No. Both components are specified as "Fail Short: No," indicating identical failure behavior characteristics.

Q: Do these parts have different storage or handling requirements?

A: No. Both components have MSL 1 (Unlimited) moisture sensitivity rating, requiring identical storage and handling procedures.

Q: Which part should be selected for new designs?

A: Selection should be based on manufacturer qualification, availability, and cost. Both parts are in active production with equivalent regulatory compliance. Verify PCB footprint requirements for the specific package variant before finalizing the design.