1KSMB6.8 Equivalent & Substitute Parts

Part Overview

The 1KSMB6.8 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc. in the DO-214AA (SMB) surface mount package. This component provides transient overvoltage protection with a 5.8V reverse standoff voltage and 10.5V maximum clamping voltage, rated for 95.2A peak pulse current and 1000W peak pulse power dissipation.

The 1KSMB6.8 carries an Obsolete product status. Identification of equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production requirements for applications requiring this voltage suppression specification.

Substiute Parts

1KSMB6.8

Littelfuse Inc.In Stock: 8591KSMB6.8 Datasheet

Current PartRFQ

1KSMB6.8A

Littelfuse Inc.In Stock: 14581KSMB6.8A Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1KSMB6.8 is determined by strict equivalence across the following electrical and mechanical parameters:

Electrical Parameters (Must Match):

• Voltage - Reverse Standoff (Typ): 5.8V
• Voltage - Breakdown (Min): 6.45V
• Voltage - Clamping (Max) @ Ipp: 10.5V
• Current - Peak Pulse (10/1000µs): 95.2A
• Power - Peak Pulse: 1000W

Mechanical Parameters (Must Match):

• Package / Case: DO-214AA, SMB
• Mounting Type: Surface Mount
• Unidirectional Channels: 1
• Type: Zener

Functional Parameters (Must Match):

• Category: Transient Voltage Suppressors (TVS)
• Series: 1KSMB

The 1KSMB6.8A qualifies as a direct substitute based on complete alignment with all electrical and mechanical parameters listed above.

Parameter Comparison

Engineering Selection Recommendations

The 1KSMB6.8A is the direct substitute for the obsolete 1KSMB6.8. Both parts are manufactured by Littelfuse Inc. and share identical electrical and mechanical specifications across all critical parameters that determine TVS diode functionality and circuit compatibility.

Product Status Consideration: The 1KSMB6.8 is classified as Obsolete, while the 1KSMB6.8A maintains Active product status. Selection of the 1KSMB6.8A ensures access to current manufacturing, ongoing supply availability, and compliance with modern regulatory standards.

Compliance Status: The 1KSMB6.8A carries ROHS3 Compliant certification, representing an advancement over the RoHS Compliant designation of the main part. Both parts maintain EAR99 export classification and identical HTSUS coding. The 1KSMB6.8A includes REACH Unaffected status documentation.

Operating Temperature Range: The 1KSMB6.8A specifies a minimum operating temperature of -55°C compared to -65°C for the 1KSMB6.8. For applications requiring operation below -55°C, the original 1KSMB6.8 specification must be retained. For standard industrial and commercial temperature ranges, the 1KSMB6.8A is fully suitable.

Packaging Format: The 1KSMB6.8A is supplied in Tape & Reel (TR) format, supporting automated assembly processes. The original 1KSMB6.8 was supplied in bulk packaging. Selection should align with production assembly requirements and inventory management practices.

Frequently Asked Questions (FAQ)

Q: Can the 1KSMB6.8A be used as a direct replacement for the 1KSMB6.8 in existing designs?

A: Yes. The 1KSMB6.8A provides identical electrical performance across all critical TVS diode parameters: reverse standoff voltage, breakdown voltage, clamping voltage, peak pulse current, and peak pulse power. Both components use the same DO-214AA (SMB) surface mount package and share identical pinout and footprint requirements. No circuit redesign is necessary.

Q: What is the difference in operating temperature range between these parts?

A: The 1KSMB6.8 operates from -65°C to 150°C, while the 1KSMB6.8A operates from -55°C to 150°C. The upper temperature limit is identical. If your application requires operation below -55°C, the original 1KSMB6.8 specification must be maintained. For standard industrial applications operating within -55°C to 150°C, both parts are equivalent.

Q: Why is the 1KSMB6.8 marked as Obsolete?

A: The 1KSMB6.8 has reached end-of-life status in the manufacturer's product portfolio. The 1KSMB6.8A represents the current active equivalent. Transitioning to the 1KSMB6.8A ensures continued access to supply, current manufacturing processes, and compliance with evolving regulatory requirements.

Q: Are there packaging differences between these parts?

A: Yes. The 1KSMB6.8 is supplied in bulk packaging, while the 1KSMB6.8A is supplied in Tape & Reel (TR) format. Tape & Reel packaging is standard for automated surface mount assembly. If your production process uses automated pick-and-place equipment, the 1KSMB6.8A is the appropriate selection. Both parts contain identical components in the same DO-214AA (SMB) package.

Q: Do both parts meet current RoHS requirements?

A: Yes. The 1KSMB6.8 is RoHS Compliant. The 1KSMB6.8A is ROHS3 Compliant, representing the current RoHS standard. Both parts satisfy RoHS requirements for new designs and manufacturing. The 1KSMB6.8A additionally includes REACH Unaffected status documentation.

Q: Can I mix 1KSMB6.8 and 1KSMB6.8A parts in the same production batch?

A: Yes. Both parts are electrically and mechanically identical across all functional parameters. They share the same footprint, pinout, and electrical characteristics. Mixing parts from different packaging formats (bulk versus Tape & Reel) is a matter of inventory and assembly process management, not technical compatibility.

Q: What certifications and export classifications apply to these parts?

A: Both the 1KSMB6.8 and 1KSMB6.8A carry EAR99 export classification and HTSUS code 8541.10.0080. Both are classified as Moisture Sensitivity Level 1 (Unlimited), indicating no special moisture handling requirements. The 1KSMB6.8A includes additional REACH Unaffected status documentation.