TVB170SA-L Equivalent & Substitute Parts

Part Overview

The TVB170SA-L is a 170V off-state transient voltage suppressor thyristor manufactured by Littelfuse Inc. in the SiBar series, packaged in DO-214AA (SMB) surface mount configuration. This component is classified as obsolete, which necessitates identification of active equivalent alternatives that maintain functional compatibility for new designs and production continuity.

Substiute Parts

TVB170SA-L

Littelfuse Inc.In Stock: 60353TVB170SA-L Datasheet

Current PartRFQ

P1800SALRP

Littelfuse Inc.In Stock: 46344P1800SALRP Datasheet

MFR RecommendedRFQ

P1800SBLRP

Littelfuse Inc.In Stock: 16971P1800SBLRP Datasheet

MFR RecommendedRFQ

P1800SCLRP

Littelfuse Inc.In Stock: 41745P1800SCLRP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the TVB170SA-L are qualified based on the following electrical and mechanical parameters:

• Voltage - Off State: Must be 170V (primary voltage rating)
• Package / Case: Must be DO-214AA, SMB (mechanical compatibility)
• Mounting Type: Must be Surface Mount (assembly compatibility)
• Current - Peak Pulse (8/20µs): Acceptable range 150A to 400A (equal or higher current handling)
• Voltage - Breakover: Acceptable range 220V to 265V (within transient suppression window)
• RoHS Status: Must maintain ROHS3 Compliance (regulatory requirement)

All substitute parts listed are from Littelfuse Inc. SIDACtor® series and carry active product status, ensuring ongoing availability and support.

Parameter Comparison

Engineering Selection Recommendations

P1800SALRP is the direct functional equivalent to TVB170SA-L. It maintains identical current handling (150A peak pulse at 8/20µs), identical on-state voltage (4V), and identical hold current (150mA). The breakover voltage is reduced from 265V to 220V, which represents a tighter transient suppression window suitable for applications requiring more aggressive voltage clamping. This part carries active product status and ROHS3 compliance.

P1800SBLRP provides increased current handling capability (250A peak pulse at 8/20µs) while maintaining the 170V off-state voltage and 4V on-state voltage. Capacitance increases to 50pF. This substitute is appropriate for applications requiring higher transient current dissipation than the original 150A specification.

P1800SCLRP offers maximum current handling (400A peak pulse at 8/20µs) with the same voltage ratings. Capacitance increases to 90pF. This substitute is suitable for high-energy transient suppression applications where peak current requirements exceed 150A.

All three substitute parts are manufactured by Littelfuse Inc., carry active product status ensuring long-term availability, and maintain ROHS3 compliance for regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can P1800SALRP directly replace TVB170SA-L in existing designs? A: Yes. P1800SALRP maintains identical electrical performance for the primary operating parameters: 170V off-state voltage, 150A peak pulse current (8/20µs), 4V on-state voltage, and 150mA hold current. The breakover voltage difference (220V vs. 265V) results in faster transient suppression, which is generally beneficial. Both parts use DO-214AA packaging and surface mount assembly.

Q: What is the difference between the three substitute options? A: The three substitutes differ in peak pulse current handling and capacitance. P1800SALRP matches the original 150A specification. P1800SBLRP increases to 250A with 50pF capacitance. P1800SCLRP provides 400A with 90pF capacitance. Selection depends on the maximum transient current your circuit must suppress.

Q: Are all substitutes available in the same packaging? A: Yes. All substitute parts use DO-214AA (SMB) surface mount packaging, ensuring mechanical and assembly compatibility with existing PCB layouts designed for TVB170SA-L.

Q: Why is the breakover voltage lower on the substitute parts? A: The substitute parts (P1800SALRP, P1800SBLRP, P1800SCLRP) operate in the SIDACtor® series with a 220V breakover voltage compared to the original 265V. This represents a design evolution in the product line and results in more responsive transient suppression within the 170V off-state operating window.

Q: Do the substitute parts meet the same compliance standards? A: Yes. All substitute parts maintain ROHS3 compliance, REACH unaffected status, and identical ECCN and HTSUS classifications as the original TVB170SA-L.

Q: Which substitute should I select for a new design? A: For direct replacement with identical current handling, select P1800SALRP. For applications requiring higher transient current dissipation, evaluate P1800SBLRP (250A) or P1800SCLRP (400A) based on your circuit's maximum expected transient current.