SA30 Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SA30 is a unidirectional Zener-type transient voltage suppressor diode manufactured by Littelfuse, designed for general-purpose overvoltage protection applications. The device features a 30V reverse standoff voltage with a 50.82V maximum clamping voltage at peak pulse current of 10.5A. Currently classified as obsolete, the SA30 requires identification of active equivalent and substitute parts to maintain design continuity and ensure component availability for new production and field replacements.

Substiute Parts

SA30

LittelfuseIn Stock: 938SA30 Datasheet

Current PartRFQ

SA30A

Taiwan Semiconductor CorporationIn Stock: 45164SA30A Datasheet

DirectRFQ

SAC30

Littelfuse Inc.In Stock: 1903SAC30 Datasheet

MFR RecommendedRFQ

SA30A-AP

Micro Commercial CoIn Stock: 1135SA30A-AP Datasheet

MFR RecommendedRFQ

SA30A-BP

Micro Commercial CoIn Stock: 951SA30A-BP Datasheet

MFR RecommendedRFQ

SA30A-TP

Micro Commercial CoIn Stock: 894SA30A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SA30 is determined by the following critical parameters:

• Voltage - Reverse Standoff (Typ): Must equal 30V
• Voltage - Breakdown (Min): Must be within the specified range (31.55V minimum for SA30)
• Mounting Type: Must be Through Hole
• Package / Case: Must be DO-204AC or DO-15 equivalent
• Type: Must be Zener diode
• Unidirectional Channels: Must equal 1
• Operating Temperature Range: Must support -55°C to 175°C minimum
• Power - Peak Pulse: Must equal or exceed 500W
• Current - Peak Pulse (10/1000µs): Must equal or exceed 10.5A

All identified substitute parts maintain the same reverse standoff voltage (30V), through-hole mounting configuration, and DO-15 package format. Variations in clamping voltage and peak pulse current remain within acceptable operational parameters for general-purpose transient suppression applications.

Parameter Comparison

Engineering Selection Recommendations

All identified substitute parts maintain active product status and meet the core electrical and mechanical requirements for SA30 replacement. Selection among available substitutes should be based on the following criteria:

Primary Recommendation: SAC30 (Littelfuse Inc.) The SAC30 is manufactured by the original equipment manufacturer (Littelfuse) and maintains ROHS3 compliance. This part provides the closest clamping voltage profile (48.6V) to the original SA30 specification and ensures design continuity with the original manufacturer's product line.

Secondary Recommendations: SA30A-TP, SA30A-AP, SA30A-BP (Micro Commercial Co) These parts are manufactured by Micro Commercial Co and provide equivalent electrical performance with 48.4V clamping voltage and 10.5A peak pulse current. All three variants maintain active product status and REACH compliance. Selection among these three should be based on packaging requirements: SA30A-TP (Cut Tape), SA30A-AP (Bulk), or SA30A-BP (Bulk).

Alternative Recommendation: SA30A (Taiwan Semiconductor Corporation) The SA30A offers the highest peak pulse current (10.8A) and is available in high inventory quantities (45,100 pcs). However, the elevated clamping voltage (64.3V) may require circuit-level verification for applications with strict voltage suppression requirements.

All substitute parts support the full operating temperature range (-55°C to 175°C) and maintain 500W peak pulse power rating, ensuring thermal and electrical compatibility with the original SA30 design.

Frequently Asked Questions (FAQ)

Q: Can SA30A substitute for SA30 in all applications? A: SA30A maintains the same 30V reverse standoff voltage and through-hole DO-15 package configuration. The elevated clamping voltage (64.3V vs. 50.82V) requires verification that the application circuit can tolerate this higher transient voltage level. Peak pulse current is adequate at 10.8A.

Q: What is the difference between SAC30 and SA30A? A: Both parts maintain 30V reverse standoff voltage and 500W peak pulse power. SAC30 is manufactured by Littelfuse (original manufacturer) with 48.6V clamping voltage and 10A peak pulse current. SA30A is manufactured by Taiwan Semiconductor Corporation with 64.3V clamping voltage and 10.8A peak pulse current. SAC30 provides closer electrical alignment to the original SA30 specification.

Q: Are the Micro Commercial Co variants (SA30A-TP, SA30A-AP, SA30A-BP) electrically identical? A: Yes. All three Micro Commercial Co variants provide identical electrical specifications: 30V reverse standoff, 48.4V clamping voltage, and 10.5A peak pulse current. Differences are limited to packaging format: SA30A-TP is supplied in Cut Tape, while SA30A-AP and SA30A-BP are supplied in Bulk.

Q: Does packaging format affect electrical performance? A: No. Packaging format (Tape & Reel, Cut Tape, or Bulk) does not affect electrical performance or device characteristics. Selection should be based on assembly process requirements and inventory management practices.

Q: Are all substitute parts RoHS compliant? A: SAC30 and SA30A-TP are explicitly ROHS3 compliant. SA30A (Taiwan Semiconductor) is ROHS3 compliant. RoHS status is not specified for SA30A-AP and SA30A-BP; verification with the manufacturer is recommended if RoHS compliance is a design requirement.

Q: Can I use these parts interchangeably in existing SA30 designs? A: All substitute parts maintain the same reverse standoff voltage (30V), through-hole mounting, and DO-15 package format. Electrical interchangeability is confirmed for the specified parameters. Circuit-level verification is recommended for applications with strict clamping voltage tolerances, particularly when considering SA30A due to its higher clamping voltage.