SA30-B Transient Voltage Suppressor Equivalent & Substitute Parts

Part Overview

The SA30-B is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., rated for 30V reverse standoff voltage with a 50.82V maximum clamping voltage. This through-hole component in DO-204AC (DO-15) package is designed for general-purpose transient voltage suppression applications. The SA30-B is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute parts maintain the same reverse standoff voltage, mounting type, and thermal operating range while offering active product status and improved availability.

Substiute Parts

SA30-B

Littelfuse Inc.In Stock: 890SA30-B Datasheet

Current PartRFQ

SA30A

Taiwan Semiconductor CorporationIn Stock: 45164SA30A Datasheet

DirectRFQ

SA30A-B

Littelfuse Inc.In Stock: 970SA30A-B Datasheet

DirectRFQ

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

Substitute parts for the SA30-B are qualified based on the following critical parameters that determine functional equivalence:

Mandatory Matching Parameters:

• Voltage - Reverse Standoff (Typ): 30V
• Unidirectional Channels: 1
• Type: Zener
• Mounting Type: Through Hole
• Package / Case: DO-204AC, DO-15, Axial
• Operating Temperature Range: -55°C ~ 175°C
• Power - Peak Pulse: 500W
• Current - Peak Pulse (10/1000µs): 10.5A (or 10.8A for SA30A)

Allowable Variation Parameters:

• Voltage - Clamping (Max) @ Ipp: 48.4V to 64.3V (within design tolerance for 30V standoff class)
• Voltage - Breakdown (Min): 31.55V to 33.3V (within specification band)
• Manufacturer: Multiple qualified sources
• Product Status: Active substitutes preferred over obsolete
• Packaging Format: Bulk, Tape & Reel, or Cut Tape acceptable

All substitute parts maintain the same electrical class, thermal performance, and mechanical interface as the SA30-B, ensuring direct functional replacement in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute - SA30A-B (Littelfuse Inc.) SA30A-B is the preferred substitute, maintaining Littelfuse Inc. as the original manufacturer with active product status. This part offers the lowest clamping voltage (48.4V) among substitutes, providing superior transient suppression performance compared to the SA30-B (50.82V). ROHS3 compliance and bulk packaging support standard procurement workflows.

Alternative Substitute - SA30A-TP (Micro Commercial Co) SA30A-TP provides equivalent electrical performance with active status and ROHS3 compliance. Cut tape packaging accommodates automated assembly processes. Operating temperature specification uses TA rather than TJ, suitable for applications where ambient temperature rating is the controlling parameter.

Secondary Substitute - SA30A (Taiwan Semiconductor Corporation) SA30A offers the highest peak pulse current rating (10.8A) and active product status with ROHS3 compliance. The 64.3V clamping voltage represents the upper tolerance band for the 30V standoff class. Tape & Reel packaging supports high-volume production environments.

Supplementary Substitutes - SA30A-AP and SA30A-BP (Micro Commercial Co) Both parts provide identical electrical specifications (48.4V clamping, 10.5A peak pulse) with active status. Bulk packaging format and equivalent performance make these suitable where Micro Commercial Co sourcing is preferred or required.

All substitute parts maintain compliance with applicable regulatory standards and thermal operating ranges specified for the SA30-B.

Frequently Asked Questions (FAQ)

Q: Can SA30A-B directly replace SA30-B in existing designs? A: Yes. SA30A-B maintains the same 30V reverse standoff voltage, 10.5A peak pulse current, 500W peak pulse power, through-hole mounting, DO-204AC package, and -55°C to 175°C operating temperature range. The lower clamping voltage (48.4V vs 50.82V) provides improved transient suppression performance.

Q: What is the difference between SA30A and SA30A-B? A: Both parts share the same 30V standoff voltage, 10.5A peak pulse current, and thermal range. SA30A has a higher clamping voltage (64.3V) and slightly higher peak pulse current (10.8A). SA30A-B offers lower clamping voltage (48.4V) for more aggressive transient suppression. Selection depends on circuit transient voltage requirements.

Q: Are packaging format differences (Bulk, Tape & Reel, Cut Tape) electrically significant? A: No. Packaging format affects procurement and assembly processes only. Bulk, Tape & Reel (TR), and Cut Tape (CT) formats contain identical components with the same electrical specifications. Selection is based on production volume and assembly equipment compatibility.

Q: Does the SA30A from Taiwan Semiconductor Corporation meet the same compliance standards as the Littelfuse SA30-B? A: SA30A is ROHS3 compliant. SA30-B is also ROHS3 compliant. Both meet the same environmental compliance requirements. Verify specific REACH or other regional compliance requirements for your application.

Q: Can I use SA30A-TP (Cut Tape) in manual assembly applications? A: Yes. Cut tape format is suitable for manual assembly, prototype builds, and low-volume production. The component specifications are identical to bulk and tape & reel formats. Handling and storage procedures remain the same.

Q: What is the significance of the clamping voltage variation (48.4V to 64.3V) among substitutes? A: All substitutes maintain the 30V reverse standoff voltage specification. Clamping voltage variation within 48.4V to 64.3V represents the tolerance band for this device class. Lower clamping voltages provide tighter transient suppression; higher values offer broader tolerance margins. Circuit design determines acceptable clamping voltage range.

Q: Are all substitute parts currently in active production? A: Yes. All listed substitutes have active product status. The SA30-B is obsolete, making active substitutes necessary for new designs and ongoing production support.