1KSMB75C Equivalent & Substitute Parts

Part Overview

The 1KSMB75C is a Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for transient overvoltage protection in electronic circuits. This bidirectional zener diode operates with a reverse standoff voltage of 64.1V and provides clamping at 103V with a peak pulse current rating of 9.7A. The device is packaged in a DO-214AA (SMB) surface mount configuration suitable for compact circuit board applications.

The 1KSMB75C is classified as obsolete, which necessitates identification of equivalent substitute components for ongoing design support, maintenance, and new production requirements. Active equivalent parts ensure continued availability and supply chain reliability for applications requiring identical electrical and mechanical specifications.

Substiute Parts

1KSMB75C

Littelfuse Inc.In Stock: 8251KSMB75C Datasheet

Current PartRFQ

1KSMB75CA

Taiwan Semiconductor CorporationIn Stock: 103771KSMB75CA Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1KSMB75C is determined by strict equivalence across the following critical electrical and mechanical parameters:

Electrical Equivalence Criteria:

• Voltage - Reverse Standoff (Typ): 64.1V
• Voltage - Breakdown (Min): 71.3V
• Voltage - Clamping (Max) @ Ipp: 103V
• Current - Peak Pulse (10/1000µs): 9.7A
• Power - Peak Pulse: 1000W (1kW)
• Type: Zener
• Bidirectional Channels: 1

Mechanical Equivalence Criteria:

• Package / Case: DO-214AA, SMB
• Mounting Type: Surface Mount

The 1KSMB75CA manufactured by Taiwan Semiconductor Corporation meets all specified electrical parameters and mechanical requirements, establishing it as a direct functional equivalent. Both devices operate within identical voltage and current specifications, ensuring pin-for-pin and functional compatibility in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

The 1KSMB75CA is a qualified substitute for the obsolete 1KSMB75C based on the following engineering criteria:

Electrical Compatibility: All critical voltage and current parameters are identical between the two devices. The reverse standoff voltage, breakdown voltage, clamping voltage, and peak pulse current specifications match exactly, ensuring equivalent circuit protection performance.

Mechanical Compatibility: Both devices utilize the DO-214AA (SMB) surface mount package with identical pin configurations and footprints, enabling direct board-level substitution without layout modifications.

Product Status: The 1KSMB75CA maintains active production status with Taiwan Semiconductor Corporation, providing assured long-term availability compared to the obsolete 1KSMB75C.

Regulatory Compliance: The 1KSMB75CA is ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements. The original 1KSMB75C is RoHS compliant, establishing regulatory equivalence.

Operating Temperature Range: The 1KSMB75CA supports an extended operating temperature range of -55°C to 175°C (TJ) compared to the 1KSMB75C range of -65°C to 150°C (TJ). This extended range provides additional thermal margin in applications operating at elevated temperatures.

Packaging Availability: The 1KSMB75CA is available in Tape & Reel (TR) packaging, supporting high-volume production requirements with improved handling and automated assembly compatibility.

Frequently Asked Questions (FAQ)

Q: Can the 1KSMB75CA be used as a direct replacement for the 1KSMB75C in existing designs?

A: Yes. The 1KSMB75CA is electrically and mechanically equivalent to the 1KSMB75C. All voltage specifications, current ratings, and package dimensions are identical, enabling direct substitution without circuit redesign or board layout modifications.

Q: What is the primary reason for substituting the 1KSMB75C?

A: The 1KSMB75C is classified as obsolete. The 1KSMB75CA provides an active, production-supported equivalent that ensures continued component availability for maintenance, repair, and new production applications.

Q: Are there differences in the operating temperature ranges between these devices?

A: The 1KSMB75CA operates across a wider temperature range (-55°C to 175°C TJ) compared to the 1KSMB75C (-65°C to 150°C TJ). The 1KSMB75CA provides extended high-temperature capability, making it suitable for applications requiring operation at elevated temperatures.

Q: Do both devices have the same package configuration?

A: Yes. Both the 1KSMB75C and 1KSMB75CA use the DO-214AA (SMB) surface mount package. The devices are pin-for-pin compatible and share identical footprints for printed circuit board assembly.

Q: What are the key electrical parameters that define substitution compatibility?

A: Substitution compatibility is determined by matching the reverse standoff voltage (64.1V), breakdown voltage (71.3V), clamping voltage (103V), and peak pulse current (9.7A). The 1KSMB75CA meets all these specifications exactly.

Q: Is the 1KSMB75CA available in different packaging formats?

A: The 1KSMB75CA is available in Tape & Reel (TR) packaging, which is standard for high-volume surface mount production. The original 1KSMB75C packaging format is not specified in the available data.

Q: Are there any compliance or certification differences between these parts?

A: Both devices are RoHS compliant. The 1KSMB75CA carries ROHS3 compliance and is REACH unaffected, meeting current environmental standards. The 1KSMB75C is RoHS compliant, establishing regulatory equivalence for most applications.

Q: What is the inventory status of the 1KSMB75CA?

A: The 1KSMB75CA has 10,300 pieces in stock as new original inventory, providing assured availability for immediate procurement and production requirements.