SA6.5-B Equivalent & Substitute Parts

Part Overview

The SA6.5-B is a Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for telecom applications. This unidirectional zener diode operates with a 6.5V reverse standoff voltage and provides 11.2V clamping at peak pulse current. The device is packaged in a DO-204AC (DO-15) through-hole axial configuration and is rated for 500W peak pulse power dissipation across an operating temperature range of -65°C to 175°C.

The SA6.5-B carries an obsolete product status. Identifying equivalent substitute parts ensures continued availability for repair, maintenance, and new design implementations where this specification is required.

Substiute Parts

SA6.5-B

Littelfuse Inc.In Stock: 1233SA6.5-B Datasheet

Current PartRFQ

SA6.5A

Taiwan Semiconductor CorporationIn Stock: 16482SA6.5A Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SA6.5-B is determined by strict equivalence across the following critical electrical and mechanical parameters:

Electrical Equivalence Criteria:

• Voltage - Reverse Standoff (Typ): 6.5V
• Voltage - Breakdown (Min): 7.22V
• Voltage - Clamping (Max) @ Ipp: 11.2V
• Power - Peak Pulse: 500W
• Type: Zener, Unidirectional

Mechanical Equivalence Criteria:

• Package / Case: DO-204AC (DO-15), Axial
• Mounting Type: Through Hole
• Unidirectional Channels: 1

Acceptable Variation:

• Current - Peak Pulse (10/1000µs): Within ±1A of specified 45.5A
• Operating Temperature Range: Minimum -55°C acceptable (original -65°C); maximum 175°C required

The SA6.5A meets all substitution criteria and is classified as a direct equivalent.

Parameter Comparison

Engineering Selection Recommendations

The SA6.5A is a direct functional equivalent to the SA6.5-B and is suitable for substitution in applications requiring a 6.5V reverse standoff TVS diode with 11.2V clamping voltage in DO-204AC through-hole packaging.

Substitution Basis:

The SA6.5A maintains electrical equivalence across all critical parameters: reverse standoff voltage, breakdown voltage, clamping voltage, and peak pulse power rating. Peak pulse current differs by 0.5A (46A versus 45.5A), which falls within acceptable engineering tolerance for this device category. The operating temperature range of the SA6.5A (-55°C to 175°C) covers the upper specification of the original part and is acceptable for applications not requiring the extended -65°C lower limit.

Compliance Status:

Both parts are RoHS compliant. The SA6.5A carries ROHS3 compliance and REACH Unaffected status, meeting current regulatory requirements. The SA6.5-B is RoHS compliant without specified ROHS3 designation.

Availability:

The SA6.5-B is obsolete with limited inventory (1,170 pcs). The SA6.5A is active with substantial inventory availability (16,400 pcs), ensuring long-term supply continuity.

Packaging Consideration:

The SA6.5-B is supplied in bulk packaging, while the SA6.5A is supplied in Tape & Reel (TR) format. Both are through-hole axial devices with identical mechanical footprints and are interchangeable in PCB assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the SA6.5A replace the SA6.5-B in existing designs?

A: Yes. The SA6.5A is electrically and mechanically equivalent to the SA6.5-B. Both devices share identical voltage ratings (6.5V reverse standoff, 11.2V clamping), power dissipation (500W), and package configuration (DO-204AC through-hole axial). The 0.5A difference in peak pulse current (46A versus 45.5A) is within acceptable tolerance for TVS diode applications.

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

A: The SA6.5-B operates from -65°C to 175°C, while the SA6.5A operates from -55°C to 175°C. The SA6.5A does not extend to the lower -65°C limit. For applications requiring operation below -55°C, the SA6.5-B specification must be maintained. For applications operating within -55°C to 175°C, the SA6.5A is suitable.

Q: Are there packaging differences between SA6.5-B and SA6.5A?

A: The SA6.5-B is supplied in bulk packaging, while the SA6.5A is supplied in Tape & Reel (TR) format. Both are identical through-hole axial devices with DO-204AC (DO-15) package configuration. The packaging format does not affect electrical performance or mechanical compatibility in circuit applications.

Q: What is the significance of the product status difference?

A: The SA6.5-B is obsolete, indicating Littelfuse Inc. has discontinued production. The SA6.5A is active, indicating Taiwan Semiconductor Corporation continues manufacturing. For new designs and long-term supply assurance, the SA6.5A is the recommended selection.

Q: Are both parts RoHS compliant?

A: Yes. The SA6.5-B is RoHS compliant. The SA6.5A is ROHS3 compliant, which represents the current regulatory standard. Both parts meet RoHS requirements for lead-free and restricted substance compliance.

Q: Can I use SA6.5A in applications originally designed for SA6.5-B?

A: Yes, provided the application does not require operation below -55°C. The SA6.5A is a direct substitute for all other electrical and mechanical specifications. Verify the minimum operating temperature requirement of your application before substitution.