SACB22 Transient Voltage Suppressor Diode - Equivalent & Substitute Parts

Part Overview

The SACB22 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This surface-mount component operates with a 22V reverse standoff voltage and provides 35.4V maximum clamping voltage at peak pulse current. The part is actively produced and RoHS3 compliant, with unlimited moisture sensitivity rating (MSL 1).

Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained within the specified parameter tolerances for this TVS diode category.

Substiute Parts

SACB22

Littelfuse Inc.In Stock: 3691SACB22 Datasheet

Current PartRFQ

SZ1SMB22AT3G

onsemiIn Stock: 145130SZ1SMB22AT3G Datasheet

MFR RecommendedRFQ

SMBJ22A

MeritekIn Stock: 2107SMBJ22A Datasheet

MFR RecommendedRFQ

SMBJ22A

MeritekIn Stock: 2107SMBJ22A Datasheet

MFR RecommendedRFQ

SMBJ22A-E3/52

Vishay General Semiconductor - Diodes DivisionIn Stock: 2220SMBJ22A-E3/52 Datasheet

MFR RecommendedRFQ

SMBJ22A-TR

STMicroelectronicsIn Stock: 5498SMBJ22A-TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SACB22 are qualified based on the following critical parameters:

• Reverse standoff voltage: 22V (identical)
• Breakdown voltage minimum: 24.4V (identical)
• Clamping voltage maximum: 35.4V to 35.5V (within acceptable tolerance)
• Package type: DO-214AA / SMB (identical mechanical form factor)
• Mounting type: Surface Mount (identical)
• Unidirectional configuration: 1 channel (identical)
• Zener diode type (identical)
• RoHS3 compliance (maintained)

Peak pulse current and power dissipation may vary within the substitute group while maintaining functional equivalence for general-purpose protection circuits. All substitute parts maintain the same reverse standoff and breakdown voltage specifications, ensuring direct functional replacement in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

All identified substitute parts maintain active product status and are functionally equivalent to the SACB22 for general-purpose transient voltage suppression applications. Selection among substitutes should be based on:

Compliance and Certification: SMBJ22A (Meritek), SMBJ22A-E3/52 (Vishay), and SMBJ22A-TR (STMicroelectronics) all carry explicit RoHS3 compliance certification. SZ1SMB22AT3G (onsemi) carries AEC-Q101 automotive qualification, suitable for applications requiring automotive-grade reliability.

Packaging Availability: SMBJ22A-TR (STMicroelectronics) and SMBJ22A-E3/52 (Vishay) are supplied in Tape & Reel format, matching the original SACB22 packaging. SMBJ22A (Meritek) is available in bulk packaging. SZ1SMB22AT3G (onsemi) is supplied in bulk format.

Performance Margin: All substitutes provide equal or superior peak pulse current ratings (16.9A to 17.7A versus 14A) and power dissipation (600W versus 500W), offering improved transient handling capability within the same voltage class.

Temperature Range: SZ1SMB22AT3G (onsemi) extends the lower operating temperature to -65°C, providing wider temperature coverage compared to the -55°C minimum of other options.

Frequently Asked Questions (FAQ)

Q: Can SMBJ22A series parts directly replace SACB22 in existing designs?

A: Yes. All SMBJ22A variants maintain identical reverse standoff voltage (22V), breakdown voltage (24.4V minimum), and clamping voltage specifications (35.4V to 35.5V). The DO-214AA / SMB package is mechanically and electrically identical. Direct PCB substitution is supported without circuit modification.

Q: What is the significance of the 0.1V difference in clamping voltage between SACB22 (35.4V) and substitute parts (35.5V)?

A: This 0.1V variation falls within normal manufacturing tolerance for TVS diodes in this voltage class and does not affect circuit functionality. Both values meet the 22V reverse standoff specification and provide equivalent overvoltage protection performance.

Q: Are there differences in peak pulse current ratings among the substitutes?

A: Yes. SACB22 is rated at 14A, while substitutes range from 16.9A to 17.7A. Higher peak pulse current ratings indicate improved transient handling capability. This represents a performance enhancement rather than a limitation, as the substitute parts can safely handle equal or greater transient energy.

Q: Which substitute part is recommended for automotive applications?

A: SZ1SMB22AT3G (onsemi) carries AEC-Q101 automotive qualification and extends the operating temperature range to -65°C, making it suitable for automotive-grade reliability requirements.

Q: Does packaging format affect electrical performance?

A: No. Tape & Reel (TR) and bulk packaging formats contain identical die and electrical characteristics. Packaging selection is based on assembly process requirements and inventory management, not electrical performance.

Q: Are all substitute parts RoHS3 compliant?

A: SMBJ22A (Meritek), SMBJ22A-E3/52 (Vishay), and SMBJ22A-TR (STMicroelectronics) explicitly state RoHS3 compliance. SZ1SMB22AT3G (onsemi) compliance status is not specified in available documentation.

Q: What is the moisture sensitivity level for substitute parts?

A: SMBJ22A (Meritek), SMBJ22A-E3/52 (Vishay), and SMBJ22A-TR (STMicroelectronics) all carry MSL 1 (Unlimited) rating, matching the SACB22. SZ1SMB22AT3G (onsemi) MSL rating is not specified.