1SMA6.5AT3 Transient Voltage Suppressor (TVS) Diode – Equivalent & Substitute Parts

Part Overview

The 1SMA6.5AT3 is a unidirectional Zener-type transient voltage suppressor manufactured by onsemi, housed in a DO-214AC (SMA) surface mount package. This component is designed for general-purpose overvoltage protection applications with a reverse standoff voltage of 6.5V and a maximum clamping voltage of 11.2V at peak pulse current. The part is currently listed as obsolete, making identification of active equivalent and substitute parts essential for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	1SMA6.5AT3
Manufacturer	onsemi
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Unidirectional Channels	1
Voltage – Reverse Standoff (Typ)	6.5V
Voltage – Breakdown (Min)	7.22V
Voltage – Clamping (Max) @ Ipp	11.2V
Current – Peak Pulse (10/1000µs)	35.7A
Power – Peak Pulse	400W
Package / Case	DO-214AC, SMA
Operating Temperature	-65°C ~ 150°C (TJ)
RoHS Status	RoHS non-compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the 1SMA6.5AT3 are grouped based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Critical Matching Parameters:

Reverse standoff voltage: 6.5V (Typ)
Breakdown voltage minimum: 7.2V to 7.22V
Package type: DO-214AC / SMA (surface mount)
Unidirectional configuration: 1 channel
Zener diode type

Secondary Consideration Parameters:

Clamping voltage at Ipp: 11.2V to 14.5V (acceptable range for general-purpose protection)
Peak pulse current: 35.7A to 276A (higher values provide enhanced transient suppression capability)
Power dissipation: 400W to 4000W (higher ratings acceptable for same application)
Operating temperature range: -55°C to 175°C (acceptable if meets or exceeds original -65°C to 150°C range)
RoHS compliance status: Active substitutes are RoHS3 compliant (improvement over non-compliant original)

Substitutes are divided into two electrical performance tiers based on clamping voltage and peak pulse current specifications.

Parameter Comparison

Part Number	Manufacturer	Vwm (Typ)	Vbr (Min)	Vc (Max) @ Ipp	Ipp (10/1000µs)	Power	Package	Temp Range	Status	RoHS
1SMA6.5AT3	onsemi	6.5V	7.22V	11.2V	35.7A	400W	DO-214AC (SMA)	-65°C ~ 150°C	Obsolete	Non-compliant
PTVS6V5S1UR,115	Nexperia USA Inc.	6.5V	7.22V	11.2V	35.7A	400W	SOD-123W	-55°C ~ 150°C	Active	ROHS3 Compliant
SM4T7V6AY	STMicroelectronics	6.5V	7.2V	14.5V	160A (8/20µs)	400W	DO-214AC (SMA)	-55°C ~ 150°C	Active	ROHS3 Compliant
SMA6J6.5A-E3/5A	Vishay General Semiconductor	6.5V	7.2V	14.5V	276A (8/20µs)	4000W	DO-214AC (SMA)	-55°C ~ 150°C	Active	ROHS3 Compliant
SMA6J6.5A-E3/61	Vishay General Semiconductor	6.5V	7.2V	14.5V	276A (8/20µs)	4000W	DO-214AC (SMA)	-55°C ~ 150°C	Active	ROHS3 Compliant
SMA6J6.5A-TR	STMicroelectronics	6.5V	7.2V	14.5V	276A (8/20µs)	600W	DO-214AC (SMA)	-55°C ~ 175°C	Active	ROHS3 Compliant
SMAJ6.5A	MDD	6.5V	7.22V	11.2V	35.7A	400W	DO-214AC (SMA)	-50°C ~ 150°C	Active	ROHS3 Compliant
SMAJ6.5A-13-F	Diodes Incorporated	6.5V	7.22V	11.2V	35.7A	400W	DO-214AC (SMA)	-55°C ~ 150°C	Active	ROHS3 Compliant
SMAJ6.5A-TP	Micro Commercial Co	6.5V	7.22V	11.2V	35.7A	400W	DO-214AC (SMA)	-55°C ~ 175°C	Active	ROHS3 Compliant
SMAJ6.5A-TR	STMicroelectronics	6.5V	7.2V	14.5V	160A (8/20µs)	400W	DO-214AC (SMA)	-55°C ~ 150°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

Tier 1 – Direct Electrical Equivalents (Identical Clamping Voltage & Peak Pulse Current):

SMAJ6.5A (MDD), SMAJ6.5A-13-F (Diodes Incorporated), and SMAJ6.5A-TP (Micro Commercial Co) provide identical electrical performance to the 1SMA6.5AT3 with 11.2V clamping voltage and 35.7A peak pulse current. All three are active products with RoHS3 compliance. SMAJ6.5A-TP offers the widest operating temperature range (-55°C ~ 175°C), providing additional thermal margin. These parts are direct pin-compatible replacements in DO-214AC (SMA) packages.

Tier 2 – Enhanced Performance Substitutes (Higher Clamping Voltage & Peak Pulse Current):

SM4T7V6AY (STMicroelectronics), SMA6J6.5A-E3/5A (Vishay), SMA6J6.5A-E3/61 (Vishay), and SMA6J6.5A-TR (STMicroelectronics) feature 14.5V clamping voltage and significantly higher peak pulse current (160A to 276A). These parts provide enhanced transient suppression capability while maintaining the same 6.5V reverse standoff voltage. All are active, RoHS3 compliant, and housed in DO-214AC (SMA) packages. SMA6J6.5A-TR supports the highest operating temperature range (-55°C ~ 175°C).

Package Consideration:

PTVS6V5S1UR,115 (Nexperia) is electrically equivalent to the 1SMA6.5AT3 but uses SOD-123W packaging instead of DO-214AC (SMA). This part is suitable only if PCB layout accommodates the different footprint.

All substitute parts are active products with RoHS3 compliance, addressing the obsolescence and regulatory status of the original 1SMA6.5AT3.

Frequently Asked Questions (FAQ)

Q: Can I use SMAJ6.5A-TR or SMA6J6.5A-TR as a direct replacement for 1SMA6.5AT3?

A: Yes, both parts are pin-compatible in DO-214AC (SMA) packages with matching 6.5V reverse standoff voltage. However, they feature higher clamping voltage (14.5V vs. 11.2V) and peak pulse current (160A to 276A vs. 35.7A). These enhanced ratings provide superior transient suppression and are acceptable for general-purpose protection applications where the original part was used.

Q: What is the difference between the Tier 1 and Tier 2 substitute groups?

A: Tier 1 substitutes (SMAJ6.5A, SMAJ6.5A-13-F, SMAJ6.5A-TP) match the original 1SMA6.5AT3 exactly in clamping voltage (11.2V) and peak pulse current (35.7A). Tier 2 substitutes (SM4T7V6AY, SMA6J6.5A-E3/5A, SMA6J6.5A-E3/61, SMA6J6.5A-TR) provide higher clamping voltage (14.5V) and peak pulse current (160A to 276A), offering enhanced protection capability. Both tiers maintain the critical 6.5V reverse standoff voltage and DO-214AC (SMA) package compatibility.

Q: Why does PTVS6V5S1UR,115 use a different package (SOD-123W)?

A: PTVS6V5S1UR,115 is electrically equivalent but manufactured by Nexperia in SOD-123W packaging. This smaller package requires different PCB footprint and layout considerations. Use this part only if your design accommodates SOD-123W mounting.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts are RoHS3 compliant, addressing the non-compliant status of the obsolete 1SMA6.5AT3. This compliance improvement is beneficial for modern manufacturing and regulatory requirements.

Q: Which substitute offers the widest operating temperature range?

A: SMAJ6.5A-TP (Micro Commercial Co) and SMA6J6.5A-TR (STMicroelectronics) both support -55°C ~ 175°C, exceeding the original -65°C ~ 150°C range. SMAJ6.5A-TP provides Tier 1 electrical equivalence, while SMA6J6.5A-TR provides Tier 2 enhanced performance.

Q: Can I substitute parts between Tier 1 and Tier 2 groups?

A: Yes. Both tiers share the same 6.5V reverse standoff voltage and DO-214AC (SMA) package. Tier 2 parts with higher clamping voltage and peak pulse current provide enhanced protection and are functionally compatible. However, circuit design validation is recommended if the original design relied on the specific 11.2V clamping characteristic.

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