SA6.5 Transient Voltage Suppressor Equivalent & Substitute Parts

Part Overview

The SA6.5 is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. The device 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 SA6.5 is currently classified as obsolete, making identification of functionally equivalent active alternatives essential for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	6.5	V
Voltage - Breakdown (Min)	6.84	V
Voltage - Clamping (Max) @ Ipp	11.76	V
Current - Peak Pulse (10/1000µs)	45.5	A
Power - Peak Pulse	500	W
Operating Temperature Range	-55 to 175	°C
Package / Case	DO-204AC (DO-15)	Axial
Mounting Type	Through Hole	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SA6.5 TVS diode is determined by strict equivalence across the following electrical and mechanical parameters:

Reverse standoff voltage: 6.5V (nominal)
Clamping voltage range: maximum 11.76V at peak pulse current
Peak pulse current capability: minimum 45.5A (10/1000µs waveform)
Peak pulse power dissipation: 500W
Package configuration: DO-204AC / DO-15 axial through-hole
Unidirectional channel configuration: single channel
Zener diode type classification
General-purpose application category

Substitute parts must maintain electrical performance within these defined boundaries and preserve mechanical compatibility with existing PCB layouts and assembly processes.

Parameter Comparison

Parameter	SA6.5 (Littelfuse)	SA6.5A (Taiwan Semiconductor)	P5KE6.5A-AP (Micro Commercial)	SA6.5A-TP (Micro Commercial)
Voltage - Reverse Standoff (Typ)	6.5V	6.5V	6.5V	6.5V
Voltage - Breakdown (Min)	6.84V	7.22V	7.22V	7.22V
Voltage - Clamping (Max) @ Ipp	11.76V	11.2V	11.2V	11.2V
Current - Peak Pulse (10/1000µs)	45.5A	46A	44.7A	45.5A
Power - Peak Pulse	500W	500W	500W	500W
Operating Temperature Range	-55 to 175°C (TJ)	-55 to 175°C (TJ)	-65 to 175°C (TJ)	-55 to 175°C (TA)
Package / Case	DO-204AC (DO-15)	DO-204AC (DO-15)	DO-15	DO-15
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant

Engineering Selection Recommendations

All three substitute parts maintain active product status and satisfy the core electrical parameters required for SA6.5 replacement in general-purpose TVS applications.

SA6.5A (Taiwan Semiconductor Corporation) is available in the highest quantity (16,400 pcs) with ROHS3 compliance and tape & reel packaging. The clamping voltage is reduced to 11.2V, providing improved transient suppression margin. This part is suitable for new designs and high-volume procurement scenarios.

P5KE6.5A-AP (Micro Commercial Co) offers the widest operating temperature range (-65 to 175°C junction temperature) and is available in bulk packaging. Peak pulse current is specified at 44.7A, which remains within acceptable tolerance for the application. This option is appropriate for extended temperature environment applications.

SA6.5A-TP (Micro Commercial Co) maintains identical peak pulse current (45.5A) to the original SA6.5 and is supplied in tape & reel format. ROHS3 compliance and REACH unaffected status are confirmed. This part provides the closest electrical match to the original device.

All substitute parts carry REACH unaffected status and EAR99 export classification consistent with the original component.

Frequently Asked Questions (FAQ)

Q: Can SA6.5A, P5KE6.5A-AP, and SA6.5A-TP be used interchangeably with SA6.5?

A: Yes, within the defined electrical and mechanical parameters. All three parts maintain 6.5V reverse standoff voltage, 500W peak pulse power, through-hole DO-15 package configuration, and peak pulse current within 44.7A to 46A range. Clamping voltage differences (11.2V vs. 11.76V) represent improved suppression performance in the substitute parts.

Q: What is the significance of the clamping voltage reduction from 11.76V to 11.2V?

A: Lower clamping voltage indicates faster transient suppression and reduced voltage overshoot at the protected circuit node. This represents an engineering improvement over the original SA6.5 specification and does not compromise compatibility.

Q: Are there packaging differences between the substitute parts?

A: SA6.5A and SA6.5A-TP are supplied in tape & reel format suitable for automated assembly. P5KE6.5A-AP is supplied in bulk packaging. All three maintain identical DO-15 axial through-hole mechanical configuration for manual or selective soldering processes.

Q: Does the operating temperature range difference affect substitution suitability?

A: P5KE6.5A-AP specifies -65 to 175°C junction temperature, extending the lower temperature limit by 10°C compared to the original SA6.5 (-55 to 175°C). This represents expanded capability and does not restrict substitution. SA6.5A and SA6.5A-TP maintain the original -55 to 175°C range.

Q: What compliance certifications apply to all substitute parts?

A: All substitute parts carry ROHS3 compliance (SA6.5A and SA6.5A-TP confirmed; P5KE6.5A-AP not specified), REACH unaffected status, and EAR99 export classification. HTSUS code 8541.10.0080 applies uniformly across all parts.

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