SACB8.5 Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SACB8.5 is an active-status Transient Voltage Suppressor diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This unidirectional Zener-type TVS diode features an 8.5V reverse standoff voltage with a 14V maximum clamping voltage and 34A peak pulse current capability in the SMB (DO-214AA) package. The part is RoHS3 compliant with unlimited moisture sensitivity rating and operates across the -55°C to 150°C temperature range. Equivalent and substitute parts are identified based on matching or closely aligned electrical performance parameters within the same package category.

Substiute Parts

SACB8.5

Littelfuse Inc.In Stock: 931SACB8.5 Datasheet

Current PartRFQ

SMBJ8.5A

Taiwan Semiconductor CorporationIn Stock: 44396SMBJ8.5A Datasheet

MFR RecommendedRFQ

SM6T10A

STMicroelectronicsIn Stock: 15265SM6T10A Datasheet

MFR RecommendedRFQ

SM6T10A-E3/52

Vishay General Semiconductor - Diodes DivisionIn Stock: 21823SM6T10A-E3/52 Datasheet

MFR RecommendedRFQ

SM6T10AY

STMicroelectronicsIn Stock: 3405SM6T10AY Datasheet

MFR RecommendedRFQ

SMBJ8.5A

Taiwan Semiconductor CorporationIn Stock: 44396SMBJ8.5A Datasheet

MFR RecommendedRFQ

SMBJ8V5A

Fairchild SemiconductorIn Stock: 35175SMBJ8V5A Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SACB8.5 are qualified based on the following electrical and mechanical criteria:

• Reverse Standoff Voltage: 8.5V nominal (tolerance range 8.55V acceptable)
• Breakdown Voltage (Min): 9.44V to 9.5V range
• Clamping Voltage (Max): 14V to 14.5V range (14.4V acceptable within specification)
• Peak Pulse Current: 34A minimum (higher values acceptable for enhanced transient handling)
• Peak Pulse Power: 500W to 600W range
• Package: DO-214AA / SMB surface mount (identical footprint and pinout)
• Type: Zener unidirectional TVS diode
• Temperature Range: -55°C to 150°C minimum (extended ranges acceptable)
• Compliance: RoHS3 compliant, MSL 1 (Unlimited)

Parts meeting these criteria are electrically and mechanically interchangeable with the SACB8.5 in general-purpose transient voltage suppression applications.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts listed maintain active product status and RoHS3 compliance, ensuring regulatory alignment with the SACB8.5. Selection among qualified substitutes depends on application-specific transient energy requirements:

SMBJ8.5A and SMBJ8V5A provide clamping voltages (14.4V) and peak pulse currents (43A and 41.7A respectively) closely matched to the SACB8.5 specification, making them direct functional equivalents with enhanced power dissipation capability (600W vs. 500W).

SM6T10A-E3/52 offers extended lower operating temperature range (-65°C vs. -55°C) with moderately higher clamping voltage (14.5V) and peak pulse current (41A), suitable for applications requiring broader temperature performance.

SM6T10A and SM6T10AY feature significantly higher peak pulse current ratings (215A at 8/20µs pulse width) and elevated clamping voltage (18.6V), appropriate for high-energy transient suppression scenarios. SM6T10AY includes AEC-Q101 automotive qualification, suitable for automotive-grade applications.

All parts share identical DO-214AA (SMB) package geometry, enabling direct PCB footprint compatibility without layout modification.

Frequently Asked Questions (FAQ)

Q: Can SACB8.5 be replaced with SMBJ8.5A in production?

A: Yes. SMBJ8.5A matches the critical electrical parameters (8.5V reverse standoff, 9.44V breakdown minimum, 14.4V clamping maximum) and shares the DO-214AA SMB package. The higher peak pulse current (43A vs. 34A) and power rating (600W vs. 500W) provide equivalent or superior performance in general-purpose transient suppression applications.

Q: What is the difference between SM6T10A and SM6T10AY?

A: Both parts are manufactured by STMicroelectronics with identical electrical specifications (8.55V standoff, 18.6V clamping, 215A peak pulse current). SM6T10AY includes AEC-Q101 automotive qualification and is designated for automotive-grade applications, while SM6T10A is general-purpose rated.

Q: Are the SM6T10 series parts (SM6T10A, SM6T10AY) direct replacements for SACB8.5?

A: SM6T10 series parts are electrically compatible but feature higher clamping voltage (18.6V vs. 14V) and significantly higher peak pulse current (215A vs. 34A). They are suitable for applications requiring enhanced transient suppression capability but may introduce different circuit behavior in voltage-sensitive designs. Verification is required for applications with strict clamping voltage limits.

Q: Do all substitute parts meet the same compliance standards as SACB8.5?

A: All listed substitute parts are RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching SACB8.5 compliance. SM6T10AY additionally carries AEC-Q101 automotive qualification.

Q: Can substitute parts be mixed in the same production batch?

A: All substitute parts share the DO-214AA SMB package and are electrically interchangeable within the specified parameter ranges. However, design verification is recommended when substituting parts with different clamping voltages or peak pulse current ratings to ensure circuit performance consistency.

Q: What packaging options are available for substitute parts?

A: SMBJ8.5A is available in bulk packaging. SM6T10A-E3/52 and SM6T10AY are supplied in Tape & Reel (TR) format. SM6T10A is available in Cut Tape (CT) and Digi-Reel® packaging. All maintain the same DO-214AA SMB component footprint regardless of packaging format.