SMAJ64 Equivalent & Substitute Parts

Part Overview

The SMAJ64 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 64V reverse standoff voltage with a maximum clamping voltage of 108.15V at peak pulse current and is packaged in the DO-214AC (SMA) form factor. The SMAJ64 is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

SMAJ64

Littelfuse Inc.In Stock: 935SMAJ64 Datasheet

Current PartRFQ

SMAJ64A

MeritekIn Stock: 122511SMAJ64A Datasheet

MFR RecommendedRFQ

SMAJ58E3/TR13

Microchip TechnologyIn Stock: 879SMAJ58E3/TR13 Datasheet

MFR RecommendedRFQ

SMAJ64A

MeritekIn Stock: 122511SMAJ64A Datasheet

MFR RecommendedRFQ

SMAJ64A-TP

Micro Commercial CoIn Stock: 5779SMAJ64A-TP Datasheet

MFR RecommendedRFQ

SMAJ64AE3/TR13

Microchip TechnologyIn Stock: 917SMAJ64AE3/TR13 Datasheet

MFR RecommendedRFQ

SMAJ64E3/TR13

Microchip TechnologyIn Stock: 1048SMAJ64E3/TR13 Datasheet

MFR RecommendedRFQ

TV04A640J-G

Comchip TechnologyIn Stock: 1003TV04A640J-G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMAJ64 is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

• Reverse standoff voltage: 64V (±tolerance)
• Package / Case: DO-214AC (SMA) surface mount
• Unidirectional configuration: 1 channel
• Type: Zener diode
• RoHS3 compliance
• MSL rating: 1 (Unlimited)

Secondary Compatibility Parameters:

• Voltage - Clamping (Max) @ Ipp: Range 103V to 114V acceptable
• Current - Peak Pulse (10/1000µs): Range 3.88A to 4.9A acceptable
• Power - Peak Pulse: 400W to 500W acceptable
• Operating Temperature: Minimum -55°C to -65°C; Maximum 150°C to 175°C acceptable

Substitute parts must maintain the 64V reverse standoff voltage specification and DO-214AC package to ensure direct form-fit-function compatibility. Variations in clamping voltage, peak pulse current, and power dissipation are acceptable within the ranges specified, as these represent performance enhancements or equivalent ratings across different manufacturers.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (64V Standoff, Equivalent Performance):

SMAJ64A (Meritek) and TV04A640J-G (Comchip) are direct electrical equivalents with 64V reverse standoff voltage, 103V clamping voltage, and 3.88A peak pulse current. Both are active products with ROHS3 compliance and MSL 1 rating. SMAJ64A offers the highest inventory availability (122,500 pcs) and is suitable for high-volume procurement. TV04A640J-G provides an alternative source with 960 pcs in stock.

SMAJ64A-TP (Micro Commercial Co) maintains 64V standoff with 103V clamping and 3.9A peak pulse current, matching the original SMAJ64 peak pulse specification more closely. This part supports extended operating temperature to 175°C and has 5,716 pcs available.

Enhanced Performance Substitutes (64V Standoff, Higher Power Dissipation):

SMAJ64AE3/TR13 and SMAJ64E3/TR13 (both Microchip Technology) offer 64V standoff voltage with increased power dissipation (500W vs. 400W). SMAJ64AE3/TR13 maintains 103V clamping with 4.9A peak pulse current. SMAJ64E3/TR13 provides 114V clamping with 4.4A peak pulse current. Both support the full -65°C to 150°C temperature range and are active products with ROHS3 compliance.

Alternative Voltage Class (58V Standoff):

SMAJ58E3/TR13 (Microchip Technology) operates at 58V reverse standoff voltage with 103V clamping and 4.9A peak pulse current. This part is suitable only for applications where the lower standoff voltage is acceptable and provides enhanced current handling (4.9A) and power dissipation (500W). It is not a direct substitute for 64V-rated circuit protection requirements.

All substitute parts are ROHS3 compliant with MSL 1 rating and are available as active products, ensuring long-term supply continuity.

Frequently Asked Questions (FAQ)

Q: Can SMAJ58E3/TR13 replace SMAJ64 in my design?

A: SMAJ58E3/TR13 has a 58V reverse standoff voltage compared to SMAJ64's 64V. Substitution is only valid if your circuit protection requirement is 58V or lower. The 6V difference in standoff voltage affects the trigger point for transient suppression and may result in premature clamping in 64V-rated applications.

Q: What is the difference between SMAJ64A and SMAJ64A-TP?

A: Both maintain 64V reverse standoff voltage and 103V clamping voltage. SMAJ64A-TP supports extended operating temperature to 175°C (vs. 150°C for SMAJ64A) and is manufactured by Micro Commercial Co, while SMAJ64A is from Meritek. Peak pulse current is 3.9A (SMAJ64A-TP) vs. 3.88A (SMAJ64A), both acceptable for the original 3.9A specification.

Q: Are Microchip SMAJ64AE3/TR13 and SMAJ64E3/TR13 interchangeable?

A: Both are Microchip 64V standoff TVS diodes in DO-214AC packages with 500W power dissipation. SMAJ64AE3/TR13 clamps at 103V with 4.9A peak pulse current, while SMAJ64E3/TR13 clamps at 114V with 4.4A peak pulse current. Selection depends on whether your circuit requires the lower clamping voltage (103V) or can tolerate the higher clamping voltage (114V).

Q: Do all substitute parts use the same DO-214AC package?

A: Yes. All listed substitute parts use the DO-214AC (SMA) surface-mount package, ensuring mechanical and electrical compatibility with the original SMAJ64 footprint and PCB layout.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, meeting the same environmental and regulatory requirements as the original SMAJ64.

Q: Which substitute offers the best inventory availability?

A: SMAJ64A (Meritek) has the highest inventory with 122,500 pcs in stock, followed by SMAJ64A-TP (5,716 pcs) and SMAJ64AE3/TR13 (903 pcs). Inventory levels should be verified with your supplier for current availability.