SA90C-B Equivalent & Substitute Parts

Part Overview

The SA90C-B is a Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for telecom applications. This component features a 90V reverse standoff voltage with a 146V maximum clamping voltage and 3.5A peak pulse current rating in a through-hole DO-204AC (DO-15) axial package. The SA90C-B is classified as obsolete, making identification of equivalent substitute parts essential for ongoing system support and component procurement.

Substiute Parts

SA90C-B

Littelfuse Inc.In Stock: 1024SA90C-B Datasheet

Current PartRFQ

SA90CA

Taiwan Semiconductor CorporationIn Stock: 1049SA90CA Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SA90C-B is determined by electrical and mechanical parameter equivalence. The following criteria establish valid substitution:

Electrical Parameters (Critical):

• Voltage - Reverse Standoff (Typ): 90V
• Voltage - Breakdown (Min): 100V
• Voltage - Clamping (Max) @ Ipp: 146V
• Current - Peak Pulse (10/1000µs): 3.5A
• Power - Peak Pulse: 500W
• Type: Zener
• Bidirectional Channels: 1

Mechanical Parameters (Critical):

• Package / Case: DO-204AC, DO-15, Axial
• Mounting Type: Through Hole

Compliance Parameters:

• RoHS Status: RoHS Compliant or equivalent
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

The SA90CA meets all electrical and mechanical requirements for direct substitution with the SA90C-B.

Parameter Comparison

Engineering Selection Recommendations

The SA90CA manufactured by Taiwan Semiconductor Corporation is a direct electrical and mechanical equivalent to the SA90C-B. Both components share identical voltage ratings, current specifications, power dissipation, package configuration, and thermal operating range parameters.

The SA90CA offers the advantage of active product status, ensuring continued availability and manufacturing support. The component maintains RoHS3 compliance, exceeding the RoHS compliance level of the original SA90C-B. Both parts are classified as MSL 1 (Unlimited), indicating no moisture sensitivity constraints during storage or handling.

The operating temperature range of the SA90CA (-55°C ~ 175°C) encompasses the critical upper thermal limit of the SA90C-B (-65°C ~ 175°C). For applications requiring the full -65°C lower temperature specification of the SA90C-B, thermal performance validation is necessary.

Frequently Asked Questions (FAQ)

Q: Can the SA90CA be used as a direct replacement for the SA90C-B in existing designs?

A: Yes. The SA90CA meets all electrical and mechanical specifications of the SA90C-B, including voltage ratings, current capacity, power dissipation, and package configuration. Both components are through-hole mounted in DO-204AC (DO-15) axial packages with identical pinout and footprint compatibility.

Q: What is the difference in operating temperature range between these parts?

A: The SA90C-B operates from -65°C to 175°C, while the SA90CA operates from -55°C to 175°C. The SA90CA does not support the full lower temperature range of the original part. Applications requiring operation below -55°C require thermal performance validation.

Q: Are there packaging differences between SA90C-B and SA90CA?

A: The SA90C-B is supplied in standard packaging, while the SA90CA is supplied in Tape & Reel (TR) format. Both use the same DO-204AC (DO-15) axial package configuration. Tape & Reel packaging is standard for automated assembly processes and does not affect component electrical or mechanical performance.

Q: What compliance certifications apply to the SA90CA?

A: The SA90CA is ROHS3 compliant and REACH unaffected. These certifications meet or exceed the RoHS compliance requirement of the SA90C-B, ensuring regulatory compliance for applications in restricted substance directive jurisdictions.

Q: Are there inventory considerations for selecting between these parts?

A: The SA90C-B is obsolete with 963 pieces in stock. The SA90CA is an active product with 976 pieces currently available. For long-term component availability and supply chain continuity, the SA90CA is the recommended selection.