SMAJ6.5CA-13 Equivalent & Substitute Parts

Part Overview

The SMAJ6.5CA-13 is a Transient Voltage Suppressor (TVS) diode manufactured by Diodes Incorporated, designed for general-purpose overvoltage protection in surface-mount applications. This part features a 6.5V reverse standoff voltage, 11.2V maximum clamping voltage, and 35.7A peak pulse current capability in a DO-214AC (SMA) package. The SMAJ6.5CA-13 is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives that maintain electrical and mechanical compatibility for circuit protection applications.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	6.5	V
Voltage - Breakdown (Min)	7.22	V
Voltage - Clamping (Max) @ Ipp	11.2	V
Current - Peak Pulse (10/1000µs)	35.7	A
Power - Peak Pulse	400	W
Operating Temperature Range	-55 to 150	°C
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Type	Zener	—
Bidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitute parts for the SMAJ6.5CA-13 are grouped based on strict electrical and mechanical parameter matching. The primary substitution criteria are:

Critical Parameters for Substitution:

Voltage - Reverse Standoff: 6.5V (exact match required)
Voltage - Breakdown (Min): 7.22V (exact match required)
Package / Case: DO-214AC, SMA (mechanical compatibility)
Mounting Type: Surface Mount (assembly compatibility)
Type: Zener (functional equivalence)
Bidirectional Channels: 1 (circuit topology match)

Group 1: Direct Electrical & Mechanical Equivalents Parts meeting all critical parameters with identical clamping voltage (11.2V) and peak pulse current (35.7A):

SMAJ6.5CA-13-F (Diodes Incorporated)
SMAJ6.5CA (MDD)
SMAJ6.5CA-E3/5A (Vishay General Semiconductor - Diodes Division)
SMAJ6.5CA-E3/61 (Vishay General Semiconductor - Diodes Division)
SMAJ6.5CA-TP (Micro Commercial Co)

Group 2: Electrical Equivalents with Higher Performance Ratings Parts matching reverse standoff and breakdown voltages but with higher clamping voltage and peak pulse current:

SM4T7V6CAY (STMicroelectronics) — 14.5V clamping, 160A peak pulse
SMA6J6.5CA-TR (STMicroelectronics) — 14.5V clamping, 276A peak pulse
SMAJ6.5CA-TR (STMicroelectronics) — 14.5V clamping, 160A peak pulse

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Breakdown Min (V)	Voltage - Clamping Max @ Ipp (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Operating Temp (°C)	Package	Product Status	RoHS Status
SMAJ6.5CA-13	Diodes Incorporated	6.5	7.22	11.2	35.7	400	-55 to 150	DO-214AC, SMA	Discontinued	RoHS non-compliant
SMAJ6.5CA-13-F	Diodes Incorporated	6.5	7.22	11.2	35.7	400	-55 to 150	DO-214AC, SMA	Active	ROHS3 Compliant
SMAJ6.5CA	MDD	6.5	7.22	11.2	35.7	400	-50 to 150	DO-214AC, SMA	Active	ROHS3 Compliant
SMAJ6.5CA-E3/5A	Vishay General Semiconductor - Diodes Division	6.5	7.22	11.2	35.7	400	-55 to 150	DO-214AC, SMA	Active	ROHS3 Compliant
SMAJ6.5CA-E3/61	Vishay General Semiconductor - Diodes Division	6.5	7.22	11.2	35.7	400	-55 to 150	DO-214AC, SMA	Active	ROHS3 Compliant
SMAJ6.5CA-TP	Micro Commercial Co	6.5	7.22	11.2	35.7	400	-55 to 175	DO-214AC, SMA	Active	ROHS3 Compliant
SM4T7V6CAY	STMicroelectronics	6.5	7.2	14.5	160 (8/20µs)	400	-55 to 150	DO-214AC, SMA	Active	ROHS3 Compliant
SMA6J6.5CA-TR	STMicroelectronics	6.5	7.2	14.5	276 (8/20µs)	600	-55 to 175	DO-214AC, SMA	Active	ROHS3 Compliant
SMAJ6.5CA-TR	STMicroelectronics	6.5	7.2	14.5	160 (8/20µs)	400	-55 to 150	DO-214AC, SMA	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance):

SMAJ6.5CA-13-F (Diodes Incorporated) is the primary direct substitute. It maintains identical electrical specifications (6.5V standoff, 7.22V breakdown, 11.2V clamping, 35.7A peak pulse) and mechanical compatibility while offering active product status and ROHS3 compliance. This part is recommended for applications requiring exact parameter matching with modern compliance standards.

SMAJ6.5CA-E3/5A and SMAJ6.5CA-E3/61 (Vishay General Semiconductor - Diodes Division) provide equivalent electrical performance with active status and ROHS3 compliance. Both are suitable direct replacements with established supply availability.

SMAJ6.5CA (MDD) offers direct electrical equivalence with a slightly reduced operating temperature minimum (-50°C vs. -55°C). This part is appropriate for applications where the lower temperature bound is not a constraint.

SMAJ6.5CA-TP (Micro Commercial Co) provides direct electrical equivalence with an extended upper operating temperature rating (-55°C to 175°C), offering thermal margin for high-temperature environments.

For Higher Performance Applications:

SM4T7V6CAY, SMA6J6.5CA-TR, and SMAJ6.5CA-TR (STMicroelectronics) are suitable when circuit design permits higher clamping voltages (14.5V) and increased peak pulse current handling. These parts maintain the 6.5V reverse standoff voltage required for circuit protection thresholds while providing enhanced transient suppression capability. SMA6J6.5CA-TR offers the highest peak pulse current (276A) and power dissipation (600W) with extended temperature range (-55°C to 175°C).

All substitute parts are ROHS3 compliant and REACH unaffected, meeting modern regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can SMAJ6.5CA-13-F be used as a direct replacement for SMAJ6.5CA-13?

A: Yes. SMAJ6.5CA-13-F maintains identical electrical parameters (6.5V reverse standoff, 7.22V breakdown, 11.2V clamping, 35.7A peak pulse) and mechanical compatibility (DO-214AC/SMA package, surface mount). The primary difference is product status (active vs. discontinued) and RoHS compliance (ROHS3 vs. non-compliant).

Q: What is the difference between Group 1 and Group 2 substitutes?

A: Group 1 parts (SMAJ6.5CA-13-F, SMAJ6.5CA, SMAJ6.5CA-E3/5A, SMAJ6.5CA-E3/61, SMAJ6.5CA-TP) provide identical electrical performance with 11.2V clamping voltage and 35.7A peak pulse current. Group 2 parts (SM4T7V6CAY, SMA6J6.5CA-TR, SMAJ6.5CA-TR) maintain the 6.5V reverse standoff voltage but feature higher clamping voltages (14.5V) and increased peak pulse current ratings. Group 2 parts are suitable only when circuit design accommodates the higher clamping voltage.

Q: Are all substitute parts in the same package?

A: Yes. All substitute parts use the DO-214AC (SMA) surface-mount package, ensuring mechanical and assembly compatibility with the original SMAJ6.5CA-13.

Q: Which substitute offers the widest operating temperature range?

A: SMA6J6.5CA-TR and SMAJ6.5CA-TP both extend the upper operating temperature to 175°C (compared to 150°C for the original part). SMA6J6.5CA-TR additionally provides the highest peak pulse current (276A) and power dissipation (600W).

Q: Are all substitutes RoHS compliant?

A: All substitute parts listed are ROHS3 compliant, whereas the original SMAJ6.5CA-13 is RoHS non-compliant. This compliance improvement is beneficial for applications subject to RoHS regulations.

Q: Can I use SM4T7V6CAY or SMA6J6.5CA-TR if my circuit is designed for 11.2V clamping?

A: These parts feature 14.5V clamping voltage, which exceeds the original specification. Use only if circuit design analysis confirms that the higher clamping voltage does not compromise protection thresholds or downstream component ratings. The 6.5V reverse standoff voltage remains identical, maintaining the protection trigger point.

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