TVB170MSB-L Equivalent & Substitute Parts

Part Overview

The TVB170MSB-L is a 170V off-state thyristor transient voltage suppressor manufactured by Littelfuse Inc. in the SiBar series, housed in a DO-214AA (SMB) surface mount package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part delivers 250A peak pulse current (8/20µs) with a 4V on-state voltage and 150mA hold current, designed for transient voltage suppression applications requiring high current handling in compact form factors.

Substiute Parts

TVB170MSB-L

Littelfuse Inc.In Stock: 944TVB170MSB-L Datasheet

Current PartRFQ

P1800SBLRP

Littelfuse Inc.In Stock: 16971P1800SBLRP Datasheet

DirectRFQ

P1800SCMCLRP

Littelfuse Inc.In Stock: 1609P1800SCMCLRP Datasheet

MFR RecommendedRFQ

TB0720H-13-F

Diodes IncorporatedIn Stock: 6226TB0720H-13-F Datasheet

MFR RecommendedRFQ

TB0720L-13-F

Diodes IncorporatedIn Stock: 4261TB0720L-13-F Datasheet

MFR RecommendedRFQ

TB0720M-13-F

Diodes IncorporatedIn Stock: 25376TB0720M-13-F Datasheet

MFR RecommendedRFQ

TISP4080H3BJR-S

Bourns Inc.In Stock: 26979TISP4080H3BJR-S Datasheet

MFR RecommendedRFQ

TISP4080M3BJR-S

Bourns Inc.In Stock: 25716TISP4080M3BJR-S Datasheet

MFR RecommendedRFQ

TISP5080H3BJR-S

Bourns Inc.In Stock: 1003TISP5080H3BJR-S Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the TVB170MSB-L are grouped based on electrical parameter compatibility within the transient voltage suppressor category. The primary substitution criteria are:

Voltage Parameters: Off-state voltage (170V), breakover voltage (220V), and on-state voltage (4V) define the suppression threshold and operating characteristics.

Current Ratings: Peak pulse current at 8/20µs and 10/1000µs waveforms, along with hold current (150mA), determine the component's ability to handle transient events.

Package Compatibility: All substitutes maintain the DO-214AA (SMB) surface mount package, ensuring mechanical and thermal compatibility with existing PCB layouts.

Compliance & Status: Active product status and ROHS3 compliance are required for modern production environments.

The substitute parts are categorized into two groups: direct electrical equivalents from Littelfuse Inc. (P1800SBLRP, P1800SCMCLRP) and cross-manufacturer alternatives from Diodes Incorporated and Bourns Inc. with comparable electrical performance in the 65V off-state voltage range.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Littelfuse Inc. - Same Voltage Class):

P1800SBLRP is the direct functional equivalent to TVB170MSB-L, maintaining identical electrical specifications (170V off-state, 220V breakover, 250A peak pulse current) while offering active product status and ROHS3 compliance. This part is recommended for applications requiring exact parameter matching with modern supply chain availability.

P1800SCMCLRP provides enhanced current handling (400A peak pulse vs. 250A) within the same 170V voltage class, suitable for applications requiring higher transient energy absorption. The 5V on-state voltage represents a minor increase from the original 4V specification.

Secondary Substitutes (Cross-Manufacturer - Lower Voltage Class):

TB0720M-13-F from Diodes Incorporated matches the 250A peak pulse current rating of the original part while operating at 65V off-state voltage. This substitute is applicable only in circuits designed for lower voltage suppression thresholds.

TISP4080H3BJR-S and TISP5080H3BJR-S from Bourns Inc. deliver 300A peak pulse current at 65V off-state voltage with active product status. TISP5080H3BJR-S features higher capacitance (345pF) compared to TISP4080H3BJR-S (140pF), affecting frequency response characteristics.

All recommended substitutes maintain DO-214AA (SMB) package compatibility, 150mA hold current specification, and ROHS3 compliance status required for current manufacturing standards.

Frequently Asked Questions (FAQ)

Q: Can P1800SBLRP directly replace TVB170MSB-L in existing designs?

A: Yes. P1800SBLRP maintains identical electrical parameters (170V off-state, 220V breakover, 4V on-state, 250A peak pulse current) and package configuration (DO-214AA, SMB). The primary difference is product status change from obsolete to active, with no circuit redesign required.

Q: What is the difference between P1800SBLRP and P1800SCMCLRP?

A: Both parts operate at 170V off-state voltage with 220V breakover. P1800SCMCLRP provides higher peak pulse current (400A vs. 250A) and higher 10/1000µs pulse current (100A vs. 80A), with a slightly elevated on-state voltage (5V vs. 4V). Selection depends on transient energy requirements in the application.

Q: Why are Diodes Incorporated and Bourns Inc. parts listed as substitutes if they operate at 65V instead of 170V?

A: These parts are listed as cross-manufacturer alternatives for applications where the circuit voltage class permits operation at lower suppression thresholds. They are not direct replacements for 170V-rated circuits but serve as options for redesigned circuits operating at 65V nominal voltage.

Q: Are all substitute parts available in tape and reel packaging?

A: Yes. All listed substitute parts are supplied in tape and reel (TR) packaging, maintaining compatibility with automated assembly processes.

Q: What compliance certifications apply to all substitute parts?

A: All substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating. REACH status varies: Littelfuse parts are REACH Unaffected, while Bourns Inc. parts are REACH Affected. Diodes Incorporated parts are REACH Unaffected.

Q: Can TB0720L-13-F substitute for TVB170MSB-L?

A: No. TB0720L-13-F operates at 65V off-state voltage with only 150A peak pulse current, significantly below the original 250A specification. This part is unsuitable for applications requiring the full current handling capacity of the TVB170MSB-L.