SA6.5C Equivalent & Substitute Parts

Part Overview

The SA6.5C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 6.5V reverse standoff voltage with an 11.76V maximum clamping voltage and 45.5A peak pulse current capability in a through-hole DO-204AC (DO-15) package. The SA6.5C is currently listed as obsolete, making equivalent substitute parts necessary for ongoing design support and component procurement.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	6.5V
Voltage - Breakdown (Min)	6.84V
Voltage - Clamping (Max) @ Ipp	11.76V
Current - Peak Pulse (10/1000µs)	45.5A
Power - Peak Pulse	500W
Type	Zener
Bidirectional Channels	1
Mounting Type	Through Hole
Package / Case	DO-204AC, DO-15, Axial
Operating Temperature	-55°C ~ 175°C

Substitute Part Grouping Explanation

Substitute parts for the SA6.5C are qualified based on the following critical parameters that must remain consistent across all alternatives:

Voltage - Reverse Standoff: 6.5V (typical)
Current - Peak Pulse (10/1000µs): 45.5A
Power - Peak Pulse: 500W
Type: Zener, Bidirectional (1 channel)
Mounting Type: Through Hole
Package / Case: DO-204AC, DO-15, Axial
Operating Temperature Range: -55°C ~ 175°C

The substitute parts identified (SA6.5CA, SA6.5CA-AP, SA6.5CA-BP, SA6.5CA-TP) maintain these core electrical and mechanical specifications. Minor variations in clamping voltage (11.2V vs. 11.76V) and breakdown voltage remain within acceptable tolerance ranges for general-purpose TVS applications where these components operate.

Parameter Comparison

Parameter	SA6.5C (Littelfuse)	SA6.5CA (onsemi)	SA6.5CA-AP (MCC)	SA6.5CA-BP (MCC)	SA6.5CA-TP (MCC)
Voltage - Reverse Standoff (Typ)	6.5V	6.5V	6.5V	6.5V	6.5V
Voltage - Breakdown (Min)	6.84V	7.22V	7.22V	7.22V	7.22V
Voltage - Clamping (Max) @ Ipp	11.76V	11.2V	11.2V	11.2V	11.2V
Current - Peak Pulse (10/1000µs)	45.5A	45.5A	45.5A	45.5A	45.5A
Power - Peak Pulse	500W	500W	500W	500W	500W
Type	Zener	Zener	Zener	Zener	Zener
Bidirectional Channels	1	1	1	1	1
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial
Operating Temperature	-55°C ~ 175°C (TJ)	-55°C ~ 175°C (TJ)	-55°C ~ 175°C (TJ)	-55°C ~ 175°C (TJ)	-55°C ~ 175°C (TA)
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	Not specified	Not specified	Not specified	ROHS3 Compliant

Engineering Selection Recommendations

All substitute parts maintain active product status with established supply chains, addressing the obsolescence of the original SA6.5C. Selection among the SA6.5CA variants should be based on packaging and availability requirements:

SA6.5CA (onsemi) is available in bulk packaging with the highest inventory level (300,300 pcs), suitable for high-volume production environments.

SA6.5CA-TP (Micro Commercial Co) is supplied in cut tape format with ROHS3 compliance certification matching the original part, providing 3,824 pcs in stock for standard component procurement workflows.

SA6.5CA-AP and SA6.5CA-BP (Micro Commercial Co) are bulk-packaged alternatives with lower inventory levels (900 and 721 pcs respectively), suitable for specific procurement scenarios.

All substitute parts comply with ECCN EAR99 and HTSUS 8541.10.0080 classifications, maintaining regulatory consistency with the original component.

Frequently Asked Questions (FAQ)

Q: Can SA6.5CA variants be used as direct replacements for SA6.5C?

A: Yes. All SA6.5CA variants maintain identical reverse standoff voltage (6.5V), peak pulse current (45.5A), power dissipation (500W), and through-hole DO-204AC packaging. The clamping voltage difference (11.2V vs. 11.76V) represents a 4.8% reduction within acceptable tolerance for general-purpose TVS applications.

Q: What is the difference between SA6.5CA-TP, SA6.5CA-AP, and SA6.5CA-BP?

A: These parts are electrically identical. The suffix designates packaging format: TP indicates cut tape, while AP and BP indicate bulk packaging variants. Selection depends on assembly process requirements and procurement volume.

Q: Is RoHS3 compliance maintained across all substitutes?

A: SA6.5CA-TP explicitly carries ROHS3 compliance certification. SA6.5CA (onsemi) and SA6.5CA-AP/BP (MCC) do not specify RoHS status in provided documentation. For applications requiring certified RoHS3 compliance, SA6.5CA-TP is the recommended selection.

Q: Are there temperature rating differences between substitutes?

A: All parts operate across -55°C to 175°C. SA6.5C and most substitutes specify this as junction temperature (TJ). SA6.5CA-TP specifies ambient temperature (TA). Both rating methods cover the same functional temperature range for through-hole components.

Q: What inventory considerations apply to substitute selection?

A: SA6.5CA (onsemi) offers the largest available inventory (300,300 pcs). SA6.5CA-TP provides 3,824 pcs with RoHS3 compliance. SA6.5CA-AP and SA6.5CA-BP offer lower quantities (900 and 721 pcs). Procurement strategy should align with production volume and compliance requirements.

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