SA36-B Equivalent & Substitute Parts

Part Overview

The SA36-B is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for transient overvoltage protection in telecom applications. This component features a 36V reverse standoff voltage with a 58.1V maximum clamping voltage and 8.8A peak pulse current rating. The SA36-B is classified as obsolete, necessitating identification of active equivalent parts to maintain design continuity and ensure supply chain availability for new production and field replacements.

Substiute Parts

SA36-B

Littelfuse Inc.In Stock: 752SA36-B Datasheet

Current PartRFQ

SA36A

Taiwan Semiconductor CorporationIn Stock: 2213SA36A Datasheet

DirectRFQ

SA36A-B

Littelfuse Inc.In Stock: 2430SA36A-B Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SA36-B is determined by strict equivalence across the following critical electrical and mechanical parameters:

Electrical Equivalence Criteria:

• Voltage - Reverse Standoff (Typ): 36V
• Voltage - Breakdown (Min): 40V
• Voltage - Clamping (Max) @ Ipp: 58.1V
• Power - Peak Pulse: 500W
• Unidirectional Channels: 1
• Type: Zener

Mechanical Equivalence Criteria:

• Package / Case: DO-204AC (DO-15)
• Mounting Type: Through Hole
• Axial configuration

Acceptable Variations:

• Current - Peak Pulse (10/1000µs): 8.8A to 9A (within component tolerance)
• Operating Temperature Range: -55°C to 175°C (subset of original -65°C to 175°C range)
• Packaging format: Bulk, Tape & Reel (does not affect electrical performance)
• Product Status: Active substitutes preferred over obsolete

The identified substitutes maintain full electrical and mechanical compatibility with the SA36-B while offering active product status and improved supply availability.

Parameter Comparison

Engineering Selection Recommendations

SA36A-B (Littelfuse Inc.) - Primary Substitute

The SA36A-B is the recommended direct substitute for the SA36-B. Both components are manufactured by Littelfuse Inc. and share identical electrical specifications including 36V reverse standoff voltage, 58.1V clamping voltage, and 8.8A peak pulse current. The SA36A-B maintains active product status, ensuring long-term availability and supply chain stability. This part carries ROHS3 compliance and REACH Affected designation. The operating temperature range of -55°C to 175°C covers the majority of industrial applications, with the upper temperature limit matching the original specification. Packaging is available in Bulk format.

SA36A (Taiwan Semiconductor Corporation) - Secondary Substitute

The SA36A provides an alternative substitute with identical voltage specifications and equivalent electrical performance. This part features a marginally higher peak pulse current rating of 9A compared to the SA36-B specification of 8.8A, providing additional transient protection margin. The SA36A is manufactured by Taiwan Semiconductor Corporation and maintains active product status with ROHS3 compliance and REACH Unaffected designation. This component is available in Tape & Reel packaging format. The operating temperature range of -55°C to 175°C is consistent with SA36A-B.

Selection Basis:

Both substitutes are qualified based on identical electrical parameters (voltage ratings and power dissipation), matching mechanical package specifications (DO-204AC through-hole axial configuration), and active product status. The SA36A-B is preferred for direct replacement in existing Littelfuse-qualified designs. The SA36A serves as an alternative when supply constraints or design flexibility permits cross-manufacturer qualification.

Frequently Asked Questions (FAQ)

Q: Can SA36A-B or SA36A be used as direct replacements for SA36-B in existing designs?

A: Yes. Both substitutes maintain identical electrical specifications for voltage ratings (36V standoff, 40V breakdown minimum, 58.1V clamping maximum) and power dissipation (500W peak pulse). The DO-204AC through-hole axial package is identical across all three parts, enabling direct PCB-level substitution without layout modifications.

Q: What is the difference between SA36A-B and SA36A?

A: The primary differences are manufacturer and packaging format. SA36A-B is manufactured by Littelfuse Inc. in Bulk packaging, while SA36A is manufactured by Taiwan Semiconductor Corporation in Tape & Reel packaging. Electrically, SA36A has a 9A peak pulse current rating compared to SA36A-B's 8.8A rating. Both meet the SA36-B electrical requirements.

Q: Why is the SA36-B classified as obsolete?

A: The SA36-B is listed as obsolete by Littelfuse Inc. The SA36A-B serves as the active replacement within the Littelfuse product line, offering equivalent specifications with continued manufacturing support and supply availability.

Q: Are there temperature range differences between the substitutes and the original SA36-B?

A: Yes. The SA36-B operates from -65°C to 175°C, while both SA36A-B and SA36A operate from -55°C to 175°C. The lower temperature limit is 10°C higher in the substitutes. For applications requiring operation below -55°C, the original SA36-B specification must be maintained.

Q: What packaging formats are available for these substitutes?

A: SA36A-B is available in Bulk packaging. SA36A is available in Tape & Reel (TR) packaging. Both formats contain the same electrical component; packaging selection depends on production volume and assembly process requirements.

Q: Are both substitutes RoHS compliant?

A: Yes. Both SA36A-B and SA36A carry ROHS3 compliance certification, meeting current environmental and regulatory requirements. The original SA36-B carries RoHS Compliant designation.

Q: What is the peak pulse current difference between SA36-B and SA36A?

A: The SA36-B is rated for 8.8A peak pulse current (10/1000µs), while SA36A is rated for 9A. This 0.2A difference falls within normal component tolerance ranges and does not affect substitution compatibility. The SA36A's slightly higher rating provides equivalent or improved transient protection performance.

Q: Can these parts be used interchangeably in telecom applications?

A: SA36A-B and SA36A are suitable for general-purpose transient voltage suppression. The original SA36-B was specified for telecom applications. Both substitutes maintain the electrical specifications required for telecom transient protection circuits and are compatible with existing telecom equipment designs.