SMAJ6.5C Equivalent & Substitute Parts

Part Overview

The SMAJ6.5C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 6.5V reverse standoff voltage, 11.76V maximum clamping voltage, and 35.7A peak pulse current capability in a DO-214AC (SMA) package. The product is currently obsolete, necessitating identification of active equivalent and substitute parts that maintain functional compatibility for new designs and production continuity.

Key Parameters

Parameter	Value	Unit
Reverse Standoff Voltage (Typ)	6.5	V
Breakdown Voltage (Min)	6.84	V
Clamping Voltage (Max) @ Ipp	11.76	V
Peak Pulse Current (10/1000µs)	35.7	A
Peak Pulse Power	400	W
Operating Temperature Range	-65 to 150	°C (TJ)
Package Type	DO-214AC (SMA)	—
Mounting Type	Surface Mount	—
Bidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the SMAJ6.5C is determined by the following critical parameters:

Mandatory Matching Criteria:

Reverse standoff voltage: 6.5V (typical)
Breakdown voltage minimum: 6.84V or higher
Package type: DO-214AC (SMA) surface mount
Bidirectional channels: 1
Mounting type: Surface mount
RoHS compliance: ROHS3 compliant

Allowable Variation Ranges:

Clamping voltage (Max) @ Ipp: 11.2V to 14.5V (tolerance band for voltage regulation)
Peak pulse current: 35.7A minimum (higher values acceptable for enhanced protection margin)
Peak pulse power: 400W minimum (higher values acceptable)
Operating temperature: -50°C to 175°C (wider ranges acceptable)

Substitute parts are grouped into two categories: direct electrical equivalents (matching clamping voltage within ±0.56V) and functional equivalents (meeting minimum electrical performance with acceptable parameter variance).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Reverse Standoff (V)	Breakdown Min (V)	Clamping Max @ Ipp (V)	Peak Pulse Current (A)	Peak Pulse Power (W)	Temp Range (°C)	Product Status
SMAJ6.5C	Littelfuse	6.5	6.84	11.76	35.7	400	-65 to 150	Obsolete
SMAJ6.5CA	MDD	6.5	7.22	11.2	35.7	400	-50 to 150	Active
SMA6J6.5CA-TR	STMicroelectronics	6.5	7.2	14.5	276	600	-55 to 175	Active
SMAJ6.5CA-13-F	Diodes Incorporated	6.5	7.22	11.2	35.7	400	-55 to 150	Active
SMAJ6.5CA-TP	Micro Commercial Co	6.5	7.22	11.2	35.7	400	-55 to 175	Active
SMAJ6.5CAE3/TR13	Microchip Technology	6.5	7.22	11.2	44.7	500	-65 to 150	Active
SMAJ6.5CE3/TR13	Microchip Technology	6.5	7.22	12.3	40.7	500	-65 to 150	Active
TV04A6V5JB-G	Comchip Technology	6.5	7.22	11.2	35.71	400	-55 to 150	Active
TV04A6V5JB-HF	Comchip Technology	6.5	7.22	11.2	35.71	400	-55 to 150	Active

Engineering Selection Recommendations

All listed substitute parts meet the mandatory electrical and mechanical compatibility criteria for the SMAJ6.5C. Selection should be based on the following factors:

Direct Electrical Equivalents (Clamping Voltage 11.2V): SMAJ6.5CA (MDD), SMAJ6.5CA-13-F (Diodes Incorporated), SMAJ6.5CA-TP (Micro Commercial Co), TV04A6V5JB-G (Comchip Technology), and TV04A6V5JB-HF (Comchip Technology) provide the closest electrical match with clamping voltages within 0.56V of the original specification. These parts are suitable for direct replacement in applications where the original 11.76V clamping voltage is not critical to circuit performance.

Enhanced Performance Equivalents: SMAJ6.5CAE3/TR13 (Microchip Technology) offers increased peak pulse current (44.7A) and power rating (500W) while maintaining the 11.2V clamping voltage, providing additional protection margin. SMAJ6.5CE3/TR13 (Microchip Technology) provides a 12.3V clamping voltage with 40.7A peak pulse current and 500W power rating. SMA6J6.5CA-TR (STMicroelectronics) offers the highest performance envelope with 14.5V clamping voltage, 276A peak pulse current, and 600W power rating, suitable for applications requiring enhanced transient suppression.

Compliance and Availability: All substitute parts are ROHS3 compliant and currently active in production. Parts from Microchip Technology (SMAJ6.5CAE3/TR13, SMAJ6.5CE3/TR13) maintain the original -65°C lower temperature limit, matching the SMAJ6.5C specification. Parts from Micro Commercial Co (SMAJ6.5CA-TP) and STMicroelectronics (SMA6J6.5CA-TR) extend the upper temperature limit to 175°C, providing broader operational range.

Frequently Asked Questions (FAQ)

Q: Can SMAJ6.5CA directly replace SMAJ6.5C without circuit modification?

A: Yes. SMAJ6.5CA maintains identical reverse standoff voltage (6.5V), peak pulse current (35.7A), and power rating (400W). The clamping voltage difference (11.2V vs. 11.76V) represents a 4.8% reduction, which is within typical circuit tolerance for general-purpose overvoltage protection applications. No circuit modification is required.

Q: What is the difference between SMAJ6.5CAE3/TR13 and SMAJ6.5CA?

A: Both parts share the same 6.5V reverse standoff voltage, 11.2V clamping voltage, and 35.7A peak pulse current. SMAJ6.5CAE3/TR13 provides enhanced specifications with 44.7A peak pulse current and 500W power rating compared to 35.7A and 400W for SMAJ6.5CA. The higher current and power ratings offer additional transient suppression capability without changing the voltage regulation characteristics.

Q: Is SMA6J6.5CA-TR (STMicroelectronics) compatible with SMAJ6.5C?

A: SMA6J6.5CA-TR is electrically compatible but represents a higher-performance option. It maintains the 6.5V reverse standoff voltage and DO-214AC package but provides significantly higher peak pulse current (276A vs. 35.7A) and clamping voltage (14.5V vs. 11.76V). This part is suitable for applications requiring enhanced protection but may not be necessary for circuits designed around the original SMAJ6.5C specifications.

Q: Are all substitute parts available in the same packaging format?

A: Yes. All listed substitute parts use the DO-214AC (SMA) surface-mount package, ensuring mechanical and footprint compatibility. Packaging options vary by manufacturer (Cut Tape, Tape & Reel, Digi-Reel), but the component outline and land pattern remain identical.

Q: What is the temperature range consideration when selecting a substitute?

A: The SMAJ6.5C operates from -65°C to 150°C. Most substitute parts operate from -55°C to 150°C or -55°C to 175°C. For applications requiring the full -65°C lower limit, select SMAJ6.5CAE3/TR13 or SMAJ6.5CE3/TR13 (Microchip Technology). For standard applications, the -55°C lower limit is acceptable for most industrial and commercial environments.

Q: Can I use TV04A6V5JB-G or TV04A6V5JB-HF as direct replacements?

A: Yes. Both Comchip Technology parts (TV04A6V5JB-G and TV04A6V5JB-HF) provide identical electrical specifications to SMAJ6.5CA with 6.5V reverse standoff voltage, 11.2V clamping voltage, and 35.71A peak pulse current. The primary difference between these two variants relates to packaging and supplier designation, not electrical performance.

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