SMAJ6.5 Transient Voltage Suppressor Equivalent & Substitute Parts

Part Overview

The SMAJ6.5 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 6.5V reverse standoff voltage with an 11.76V maximum clamping voltage and 35.7A peak pulse current capability in a DO-214AC (SMA) package. The SMAJ6.5 is classified as obsolete, necessitating identification of active equivalent and substitute parts that maintain functional compatibility for new designs and production 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)	35.7	A
Power - Peak Pulse	400	W
Operating Temperature Range	-65 to 150	°C (TJ)
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the SMAJ6.5 are grouped based on electrical parameter compatibility within the following criteria:

Primary Substitution Group (Direct Equivalents): Parts maintaining 6.5V reverse standoff voltage, 35.7A peak pulse current (10/1000µs), 400W peak pulse power, and DO-214AC (SMA) package configuration. These parts are functionally interchangeable with the original SMAJ6.5.

Secondary Substitution Group (Higher Performance): Parts maintaining 6.5V reverse standoff voltage and DO-214AC (SMA) package but with elevated peak pulse current ratings (276A at 8/20µs) and higher peak pulse power (4000W or 600W). These parts provide enhanced transient suppression capability and are suitable for applications requiring greater energy dissipation.

Key Parameters Determining Substitutability:

Voltage - Reverse Standoff: 6.5V (fixed)
Voltage - Breakdown (Min): 7.2V to 7.22V range
Package / Case: DO-214AC, SMA (mandatory)
Mounting Type: Surface Mount (mandatory)
RoHS Status: ROHS3 Compliant (mandatory)
Moisture Sensitivity Level: 1 (Unlimited) (mandatory)

Parameter Comparison

Manufacturer Part Number	Manufacturer	Product Status	Voltage - Reverse Standoff (V)	Voltage - Breakdown Min (V)	Voltage - Clamping Max @ Ipp (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Operating Temperature (°C)	Package
SMAJ6.5	Littelfuse Inc.	Obsolete	6.5	6.84	11.76	35.7	400	-65 to 150	DO-214AC, SMA
SMAJ6.5A	MDD	Active	6.5	7.22	11.2	35.7	400	-50 to 150	DO-214AC, SMA
SMAJ6.5A-13-F	Diodes Incorporated	Active	6.5	7.22	11.2	35.7	400	-55 to 150	DO-214AC, SMA
SMAJ6.5A-TP	Micro Commercial Co	Active	6.5	7.22	11.2	35.7	400	-55 to 175	DO-214AC, SMA
SMAJ6.5AE3/TR13	Microchip Technology	Active	6.5	7.22	11.2	44.7	500	-65 to 150	DO-214AC, SMA
SMAJ6.5E3/TR13	Microchip Technology	Active	6.5	7.22	12.3	40.7	500	-65 to 150	DO-214AC, SMA
SMA6J6.5A-E3/5A	Vishay General Semiconductor - Diodes Division	Active	6.5	7.2	14.5	276 (8/20µs)	4000	-55 to 150	DO-214AC, SMA
SMA6J6.5A-E3/61	Vishay General Semiconductor - Diodes Division	Active	6.5	7.2	14.5	276 (8/20µs)	4000	-55 to 150	DO-214AC, SMA
SMA6J6.5A-TR	STMicroelectronics	Active	6.5	7.2	14.5	276 (8/20µs)	600	-55 to 175	DO-214AC, SMA

Engineering Selection Recommendations

For Direct Replacement (Equivalent Performance):

Select SMAJ6.5A (MDD), SMAJ6.5A-13-F (Diodes Incorporated), or SMAJ6.5A-TP (Micro Commercial Co) when the original SMAJ6.5 specifications must be maintained. All three parts are active products with ROHS3 compliance and MSL 1 rating. SMAJ6.5A-TP offers the widest operating temperature range (-55 to 175°C), suitable for extended thermal environments. SMAJ6.5A-13-F provides the highest inventory availability (30,814 pcs).

For Enhanced Performance Applications:

Select SMAJ6.5AE3/TR13 or SMAJ6.5E3/TR13 (Microchip Technology) when increased peak pulse current or power dissipation is required. Both maintain the 6.5V reverse standoff voltage and DO-214AC package while offering 44.7A or 40.7A peak pulse current and 500W peak pulse power. These parts restore the original operating temperature range of -65°C to 150°C.

For Maximum Transient Protection:

Select SMA6J6.5A-E3/5A, SMA6J6.5A-E3/61 (Vishay General Semiconductor), or SMA6J6.5A-TR (STMicroelectronics) when the application requires superior transient suppression with 276A peak pulse current (8/20µs) and 4000W or 600W peak pulse power. SMA6J6.5A-TR offers the highest operating temperature ceiling (-55 to 175°C) and is manufactured by STMicroelectronics, a major semiconductor supplier.

All recommended substitutes maintain ROHS3 compliance and MSL 1 moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage protocols.

Frequently Asked Questions (FAQ)

Q: Can SMAJ6.5A directly replace the obsolete SMAJ6.5?

A: Yes. SMAJ6.5A maintains the same 6.5V reverse standoff voltage, 35.7A peak pulse current (10/1000µs), 400W peak pulse power, and DO-214AC (SMA) package. The primary difference is a slightly lower clamping voltage (11.2V vs. 11.76V) and a narrower operating temperature range (-50 to 150°C vs. -65 to 150°C). For most general-purpose applications, this substitution is functionally equivalent.

Q: What is the difference between the 10/1000µs and 8/20µs pulse specifications?

A: These represent different test pulse waveforms. The 10/1000µs waveform is a slower transient pulse, while 8/20µs is a faster, more severe transient. Parts rated for 8/20µs (such as Vishay and STMicroelectronics variants) provide higher peak current ratings and are suitable for applications experiencing faster transient events. Selection depends on the actual transient profile in your application.

Q: Are all substitute parts available in Tape & Reel (TR) packaging?

A: Most substitute parts are available in Tape & Reel packaging. SMAJ6.5A (MDD) does not specify packaging type in the provided data. Verify packaging availability with your supplier before finalizing procurement.

Q: Which substitute offers the best thermal performance?

A: SMAJ6.5A-TP (Micro Commercial Co) and SMA6J6.5A-TR (STMicroelectronics) both support operating temperatures up to 175°C, compared to 150°C for most other variants. For high-temperature applications, these parts are preferred.

Q: Can I use the higher-current variants (276A) as drop-in replacements?

A: Yes, from an electrical standpoint. The Vishay and STMicroelectronics variants with 276A peak pulse current are backward-compatible with the SMAJ6.5 in terms of voltage parameters and package. However, they exhibit higher clamping voltages (14.5V vs. 11.76V), which may affect circuit behavior in sensitive applications. Verify that your circuit design tolerates the higher clamping voltage before substitution.

Q: What is the significance of the ROHS3 and MSL 1 ratings?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances regulations for lead-free manufacturing. MSL 1 (Unlimited) means the component has no moisture sensitivity restrictions and can be stored indefinitely without special desiccant packaging, simplifying logistics and inventory management.

Q: Which substitute has the highest inventory availability?

A: SMAJ6.5A-13-F (Diodes Incorporated) has the highest reported inventory at 30,814 pcs, followed by SMA6J6.5A-TR (STMicroelectronics) at 10,100 pcs. For high-volume production, these parts offer supply security.

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