SMAJ17AE3/TR13 Equivalent & Substitute Parts

Part Overview

The SMAJ17AE3/TR13 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Microchip Technology, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 17V reverse standoff voltage with a 27.6V maximum clamping voltage and 18.1A peak pulse current capability in a DO-214AC (SMA) package. The part is currently in active production status with RoHS3 compliance and unlimited moisture sensitivity rating.

Substitute parts are identified based on matching electrical performance parameters within the SMAJ17 series, maintaining compatibility with DO-214AC (SMA) surface-mount packaging and equivalent voltage/current specifications for direct circuit board replacement.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	17	V
Voltage - Breakdown (Min)	18.9	V
Voltage - Clamping (Max) @ Ipp	27.6	V
Current - Peak Pulse (10/1000µs)	18.1	A
Power - Peak Pulse	500	W
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Operating Temperature Range	-65°C ~ 150°C	TJ
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the SMAJ17AE3/TR13 are qualified based on the following criteria:

Electrical Equivalence: All substitute parts maintain the core voltage specifications: 17V reverse standoff voltage, 18.9V minimum breakdown voltage, and 27.6V maximum clamping voltage. These parameters define the primary protection function and determine circuit compatibility.

Package Compatibility: All substitutes use DO-214AC (SMA) surface-mount packaging, ensuring mechanical and electrical compatibility with existing PCB layouts without requiring design modifications.

Current Rating Tolerance: The main part specifies 18.1A peak pulse current. Substitute parts operate at 14.49A to 14.5A peak pulse current, representing a reduction in peak pulse capability. This variance is within the SMAJ17 series specification range and remains suitable for general-purpose applications where the circuit design accommodates the specified current rating.

Power Dissipation: The main part is rated at 500W peak pulse power. Substitute parts are rated at 400W peak pulse power, reflecting the lower current rating. Circuit designs must verify that the actual transient energy does not exceed the substitute part's power rating.

Compliance and Status: All parts maintain RoHS3 compliance, unlimited moisture sensitivity (MSL 1), and active production status, ensuring long-term availability and regulatory alignment.

Parameter Comparison

Parameter	SMAJ17AE3/TR13 (Microchip)	SMAJ17A (Meritek)	SMAJ17A-13-F (Diodes Inc)	SMAJ17A-TP (MCC)
Manufacturer	Microchip Technology	Meritek	Diodes Incorporated	Micro Commercial Co
Voltage - Reverse Standoff (Typ)	17V	17V	17V	17V
Voltage - Breakdown (Min)	18.9V	18.9V	18.9V	18.9V
Voltage - Clamping (Max) @ Ipp	27.6V	27.6V	27.6V	27.6V
Current - Peak Pulse (10/1000µs)	18.1A	14.49A	14.5A	14.5A
Power - Peak Pulse	500W	400W	400W	400W
Package / Case	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA
Operating Temperature Range	-65°C ~ 150°C (TJ)	-55°C ~ 150°C	-55°C ~ 150°C (TJ)	-55°C ~ 175°C (TA)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active	Active

Engineering Selection Recommendations

Primary Selection (SMAJ17AE3/TR13): Use the original Microchip part when the circuit design requires the full 18.1A peak pulse current and 500W power dissipation capability. This part offers the highest current rating within the SMAJ17 series and is suitable for applications with higher transient energy levels.

Substitute Selection (SMAJ17A-TP, Micro Commercial Co): This part is suitable for applications where the circuit design accommodates 14.5A peak pulse current and 400W power dissipation. The extended operating temperature range (-55°C ~ 175°C) provides additional thermal margin in high-temperature environments compared to the main part's -65°C ~ 150°C range. Active production status and full RoHS3 compliance ensure supply continuity.

Substitute Selection (SMAJ17A-13-F, Diodes Incorporated): This part meets the same electrical and thermal specifications as SMAJ17A-TP, with 14.5A peak pulse current and 400W power dissipation. Suitable for equivalent circuit applications with standard operating temperature requirements (-55°C ~ 150°C). Tape & Reel packaging supports high-volume manufacturing processes.

Substitute Selection (SMAJ17A, Meritek): This part operates at 14.49A peak pulse current and 400W power dissipation with a standard operating temperature range (-55°C ~ 150°C). Suitable for general-purpose applications matching the electrical specifications. Higher inventory availability (2725 pcs) may support expedited procurement.

Temperature Consideration: The SMAJ17A-TP variant supports operation to 175°C (TA), exceeding the main part's 150°C (TJ) rating. Select this variant for applications requiring extended high-temperature performance.

Compliance Verification: All substitute parts maintain RoHS3 compliance and unlimited moisture sensitivity, ensuring regulatory alignment with the original part across all manufacturing and deployment scenarios.

Frequently Asked Questions (FAQ)

Q: Can SMAJ17A-TP directly replace SMAJ17AE3/TR13 in existing circuit designs?

A: Direct replacement is possible if the circuit design accommodates 14.5A peak pulse current instead of 18.1A, and 400W power dissipation instead of 500W. The voltage specifications (17V standoff, 27.6V clamping) are identical. Verify that the actual transient energy in your application does not exceed 400W. The DO-214AC (SMA) package is mechanically and electrically identical, requiring no PCB layout changes.

Q: What is the primary difference between the main part and substitute parts?

A: The SMAJ17AE3/TR13 provides 18.1A peak pulse current and 500W power dissipation. All substitute parts (SMAJ17A variants) provide 14.49A to 14.5A peak pulse current and 400W power dissipation. All parts share identical voltage specifications and package type. The difference reflects the current-handling capability; select based on your circuit's transient current requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. The SMAJ17AE3/TR13 and all substitute parts (SMAJ17A, SMAJ17A-13-F, SMAJ17A-TP) are RoHS3 compliant with unlimited moisture sensitivity (MSL 1). All parts meet current environmental and regulatory requirements.

Q: Which substitute part offers the widest operating temperature range?

A: The SMAJ17A-TP (Micro Commercial Co) supports -55°C ~ 175°C (TA), providing the widest temperature range. The main part operates -65°C ~ 150°C (TJ), and other substitutes operate -55°C ~ 150°C (TJ). Select SMAJ17A-TP for high-temperature applications requiring extended thermal performance.

Q: Do all parts use the same DO-214AC (SMA) package?

A: Yes. All parts—SMAJ17AE3/TR13, SMAJ17A, SMAJ17A-13-F, and SMAJ17A-TP—use DO-214AC (SMA) surface-mount packaging. No PCB layout modifications are required for substitution. All parts are compatible with standard surface-mount assembly processes.

Q: What inventory availability exists for substitute parts?

A: SMAJ17A-TP (MCC) has 5964 pcs in stock; SMAJ17A-13-F (Diodes Inc) has 3041 pcs; SMAJ17A (Meritek) has 2725 pcs; SMAJ17AE3/TR13 (Microchip) has 949 pcs. Inventory levels support various procurement timelines and volume requirements.

Q: Are all parts in active production status?

A: Yes. The SMAJ17AE3/TR13 and all substitute parts maintain active production status, ensuring long-term availability and supply chain stability.

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