SMAJ64C Equivalent & Substitute Parts

Part Overview

The SMAJ64C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This part operates with a 64V reverse standoff voltage and provides clamping at 108.15V with a peak pulse current of 3.9A. The SMAJ64C is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain compatibility with the DO-214AC (SMA) package and preserve the core electrical characteristics required for circuit protection.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	64	V
Voltage - Breakdown (Min)	67.37	V
Voltage - Clamping (Max) @ Ipp	108.15	V
Current - Peak Pulse (10/1000µs)	3.9	A
Power - Peak Pulse	400	W
Package / Case	DO-214AC, SMA	—
Operating Temperature	-65 to 150	°C
Type	Zener	—
Bidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SMAJ64C is determined by the following critical parameters:

Reverse Standoff Voltage (Vwm): Must be 64V to maintain circuit protection threshold
Package Type: Must be DO-214AC (SMA) for mechanical and electrical compatibility
Clamping Voltage Range: Acceptable range is 103V to 114V (compared to original 108.15V)
Peak Pulse Current: Acceptable range is 3.88A to 4.9A (compared to original 3.9A)
Power Dissipation: Acceptable range is 400W to 500W
Operating Temperature Range: Must support -55°C minimum to 150°C maximum
RoHS Compliance: Must be ROHS3 compliant
Product Status: Active status preferred for long-term availability

Substitute parts are grouped into two categories based on clamping voltage characteristics:

Group A (103V Clamping): SMAJ64CA, SMAJ64CA-13-F, SMAJ64CA-TP, TV04A640JB-G — Lower clamping voltage suitable for applications with tighter voltage regulation requirements.

Group B (103V-114V Clamping): SMAJ64CAE3/TR13, SMAJ64CE3/TR13 — Higher clamping voltage and peak pulse current for applications requiring enhanced transient suppression.

Group C (58V Standoff): SMAJ58CE3/TR13 — Different voltage class; substitution only for circuits designed for 58V protection.

Parameter Comparison

Part Number	Manufacturer	Vwm (V)	Vbr Min (V)	Vc Max (V)	Ipp (A)	Ppk (W)	Temp Range (°C)	Status
SMAJ64C	Littelfuse Inc.	64	67.37	108.15	3.9	400	-65 to 150	Obsolete
SMAJ64CA	Meritek	64	71.1	103	3.88	400	-55 to 150	Active
SMAJ64CA-13-F	Diodes Incorporated	64	71.1	103	3.9	400	-55 to 150	Active
SMAJ64CA-TP	Micro Commercial Co	64	71.1	103	3.9	400	-55 to 175	Active
SMAJ64CAE3/TR13	Microchip Technology	64	71.1	103	4.9	500	-65 to 150	Active
SMAJ64CE3/TR13	Microchip Technology	64	71.1	114	4.4	500	-65 to 150	Active
TV04A640JB-G	Comchip Technology	64	71.1	103	3.88	400	-55 to 150	Active
SMAJ58CE3/TR13	Microchip Technology	58	64.4	103	4.9	500	-65 to 150	Active

Engineering Selection Recommendations

Primary Substitutes (Direct Replacement)

SMAJ64CA-13-F (Diodes Incorporated) and SMAJ64CA-TP (Micro Commercial Co) are the preferred direct replacements. Both maintain the 64V standoff voltage, 103V clamping voltage, and 3.9A peak pulse current. Both are active products with ROHS3 compliance and full availability. SMAJ64CA-TP offers extended operating temperature to 175°C, providing additional thermal margin for high-temperature applications.

Secondary Substitutes (Enhanced Performance)

SMAJ64CAE3/TR13 (Microchip Technology) and SMAJ64CE3/TR13 (Microchip Technology) provide higher peak pulse current (4.4A to 4.9A) and power dissipation (500W), enabling use in circuits with more severe transient conditions. SMAJ64CE3/TR13 offers the highest clamping voltage at 114V. Both support the original -65°C lower temperature limit.

Alternative Substitute (Different Manufacturer)

TV04A640JB-G (Comchip Technology) matches the 64V standoff and 103V clamping specifications with 3.88A peak pulse current. This part provides an alternative sourcing option with active product status.

Lower Voltage Alternative

SMAJ58CE3/TR13 (Microchip Technology) operates at 58V standoff voltage and is suitable only for circuits specifically designed for 58V protection. This part is not a direct replacement for the SMAJ64C.

All recommended substitutes are ROHS3 compliant and maintain the DO-214AC (SMA) package format required for PCB compatibility.

Frequently Asked Questions (FAQ)

Q: Can SMAJ64CA-TP replace SMAJ64C directly in production?

A: Yes. SMAJ64CA-TP maintains identical standoff voltage (64V), clamping voltage (103V), and peak pulse current (3.9A). The extended operating temperature range (-55°C to 175°C) provides additional thermal capability. All electrical parameters fall within acceptable substitution limits.

Q: What is the difference between SMAJ64CAE3/TR13 and SMAJ64CE3/TR13?

A: Both are Microchip Technology products with 64V standoff voltage. SMAJ64CAE3/TR13 clamps at 103V with 4.9A peak pulse current. SMAJ64CE3/TR13 clamps at 114V with 4.4A peak pulse current. Selection depends on whether lower or higher clamping voltage is required for the application.

Q: Why does SMAJ64CA have a higher minimum breakdown voltage (71.1V) than SMAJ64C (67.37V)?

A: Breakdown voltage variation is within normal manufacturing tolerance for TVS diodes. The critical parameter is the standoff voltage (64V), which both parts maintain. The higher breakdown voltage in SMAJ64CA does not affect circuit protection performance.

Q: Is SMAJ58CE3/TR13 compatible with SMAJ64C circuits?

A: No. SMAJ58CE3/TR13 operates at 58V standoff voltage, which is 6V lower than SMAJ64C. This part is suitable only for circuits designed for 58V protection and will not provide equivalent protection in SMAJ64C applications.

Q: What does the "-13-F" suffix in SMAJ64CA-13-F indicate?

A: The suffix indicates a specific packaging or manufacturing variant from Diodes Incorporated. The electrical specifications remain identical to other SMAJ64CA variants. Consult the manufacturer datasheet for packaging-specific details.

Q: Are all substitute parts available in tape and reel packaging?

A: Most substitutes are available in tape and reel (TR) format for automated assembly. Verify packaging availability with the specific manufacturer or distributor before procurement.

Q: Can I use SMAJ64CA-TP in applications requiring -65°C operation?

A: SMAJ64CA-TP is rated to -55°C minimum. For applications requiring -65°C operation, use SMAJ64CAE3/TR13 or SMAJ64CE3/TR13, which both support -65°C to 150°C.

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