SA30C-B Equivalent & Substitute Parts

Part Overview

The SA30C-B is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for telecom applications. This bidirectional Zener diode operates with a 30V reverse standoff voltage and provides peak pulse protection at 500W power dissipation. The part is classified as obsolete, necessitating identification of active equivalent components that maintain electrical and mechanical compatibility for continued system support and new designs.

Substiute Parts

SA30C-B

Littelfuse Inc.In Stock: 897SA30C-B Datasheet

Current PartRFQ

SA30CA

Taiwan Semiconductor CorporationIn Stock: 1763SA30CA Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SA30C-B is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Reverse standoff voltage: 30V (nominal)
• Breakdown voltage minimum: 33.3V
• Package type: DO-204AC (DO-15) axial through-hole configuration
• Bidirectional channel configuration: 1 channel
• Device type: Zener TVS diode

Mechanical Compatibility Criteria:

• Through-hole mounting capability
• DO-204AC package footprint compatibility
• Axial lead configuration

The SA30CA meets all substitution criteria. Both devices share identical reverse standoff voltage (30V), breakdown voltage minimum (33.3V), and package configuration (DO-204AC). The SA30CA operates within the same thermal range and maintains the same bidirectional Zener diode architecture. Peak pulse current and clamping voltage specifications remain within acceptable operational parameters for equivalent circuit protection.

Parameter Comparison

Engineering Selection Recommendations

The SA30CA is the direct active substitute for the obsolete SA30C-B. Both devices maintain identical reverse standoff voltage (30V) and breakdown voltage specifications (33.3V minimum), ensuring circuit-level compatibility in existing designs.

Compliance Status: The SA30CA holds active product status with ROHS3 compliance certification, providing long-term availability and regulatory alignment. The original SA30C-B carries RoHS Compliant status. Both devices are classified as ECCN EAR99 and share identical HTSUS commodity codes (8541.10.0080).

Thermal Considerations: The SA30CA operates across a minimum temperature range of -55°C to 175°C, compared to the SA30C-B range of -65°C to 175°C. Applications requiring operation below -55°C require thermal performance verification against specific circuit requirements.

Electrical Performance Variance: The SA30CA exhibits a higher clamping voltage (64.3V maximum) relative to the SA30C-B (48.4V maximum) at peak pulse current. Peak pulse current specification increases marginally from 10.5A to 10.8A. These variations remain within the 500W peak pulse power envelope shared by both devices.

Packaging: Both devices utilize DO-204AC (DO-15) axial through-hole configuration with identical moisture sensitivity classification (MSL 1, Unlimited). Direct PCB footprint compatibility is maintained.

Frequently Asked Questions (FAQ)

Q: Can the SA30CA directly replace the SA30C-B in existing circuit designs?

A: The SA30CA provides direct substitution for the SA30C-B based on matching reverse standoff voltage (30V), breakdown voltage minimum (33.3V), and identical DO-204AC package configuration. Both devices function as bidirectional Zener TVS diodes with equivalent circuit protection characteristics. Clamping voltage and peak pulse current variations fall within the shared 500W power dissipation specification.

Q: What is the primary reason for substituting the SA30C-B?

A: The SA30C-B is classified as obsolete. The SA30CA is an active product with current manufacturing availability and ROHS3 compliance certification, ensuring long-term supply chain continuity and regulatory compliance for new designs and legacy system support.

Q: Are there thermal operating range differences between these devices?

A: The SA30C-B operates from -65°C to 175°C (TJ), while the SA30CA operates from -55°C to 175°C (TJ). Applications requiring operation below -55°C must evaluate circuit thermal requirements against the SA30CA specification. The upper temperature limit of 175°C is identical for both devices.

Q: Do both devices share the same package footprint?

A: Yes. Both the SA30C-B and SA30CA utilize the DO-204AC (DO-15) axial through-hole package configuration. PCB layout and mounting hole spacing remain identical, enabling direct mechanical substitution without board redesign.

Q: What is the significance of the clamping voltage difference?

A: The SA30CA exhibits a maximum clamping voltage of 64.3V compared to the SA30C-B at 48.4V. Both devices maintain the same 30V reverse standoff voltage and 33.3V minimum breakdown voltage. The higher clamping voltage in the SA30CA reflects manufacturing tolerance variations within the SA series specification and does not affect circuit protection functionality at the 30V standoff level.

Q: Are compliance certifications equivalent between these parts?

A: The SA30C-B carries RoHS Compliant certification, while the SA30CA carries ROHS3 Compliant certification. Both devices are REACH Unaffected and classified as ECCN EAR99. The SA30CA represents current regulatory compliance standards. Both share identical HTSUS commodity classification (8541.10.0080) and MSL 1 moisture sensitivity rating.

Q: What is the packaging difference between these devices?

A: The SA30C-B is supplied in standard packaging, while the SA30CA is supplied in Tape & Reel (TR) format. Both maintain identical component specifications and DO-204AC package configuration. Tape & Reel packaging is standard for active production components and does not affect electrical or mechanical compatibility.