SMAJ12A-TP Transient Voltage Suppressor Diode - Equivalent & Substitute Parts

Part Overview

The SMAJ12A-TP is a unidirectional transient voltage suppressor (TVS) diode manufactured by Micro Commercial Co, designed for general-purpose overvoltage protection in surface-mount applications. This component operates with a 12V reverse standoff voltage and provides 400W peak pulse power dissipation in a DO-214AC (SMA) package. The part is actively produced and ROHS3 compliant, with unlimited moisture sensitivity rating (MSL 1).

Equivalent and substitute parts are identified based on matching electrical performance parameters and package compatibility, enabling design flexibility and supply chain alternatives while maintaining circuit protection specifications.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	12	V
Voltage - Breakdown (Min)	13.3	V
Voltage - Clamping (Max) @ Ipp	19.9	V
Current - Peak Pulse (10/1000µs)	20.1	A
Power - Peak Pulse	400	W
Type	Zener	-
Unidirectional Channels	1	-
Package / Case	DO-214AC, SMA	-
Mounting Type	Surface Mount	-
Operating Temperature	-55 to 175	°C
RoHS Status	ROHS3 Compliant	-
MSL Rating	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitute parts are classified into two categories based on electrical and mechanical compatibility:

Direct Equivalents maintain identical electrical specifications (12V standoff, 13.3V minimum breakdown, 19.9V clamping, 20.1A peak pulse, 400W power dissipation) and use the same DO-214AC (SMA) package. These parts are pin-compatible and functionally interchangeable without circuit modification.

Similar Alternatives share the same 12V standoff voltage and 13.3V minimum breakdown voltage but differ in clamping voltage, peak pulse current, power dissipation, or package form factor. These parts require evaluation for specific application requirements and may necessitate board layout adjustments due to package differences.

The critical parameters determining substitution eligibility are: Voltage - Reverse Standoff (12V), Voltage - Breakdown (13.3V minimum), Package Type (DO-214AC/SMA or compatible), and Mounting Type (Surface Mount).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Breakdown (V)	Voltage - Clamping (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Package	Operating Temp (°C)	Product Status
SMAJ12A-TP	Micro Commercial Co	12	13.3	19.9	20.1	400	DO-214AC (SMA)	-55 to 175	Active
SMAJ12A	Good-Ark Semiconductor	12	13.3	19.9	20.1	400	DO-214AC (SMA)	-55 to 150	Active
SMAJ12A-13-F	Diodes Incorporated	12	13.3	19.9	20.1	400	DO-214AC (SMA)	-55 to 150	Active
SMAJ12A-E3/61	Vishay General Semiconductor - Diodes Division	12	13.3	19.9	20.1	400	DO-214AC (SMA)	-55 to 150	Active
SMA6F12A-M3/6A	Vishay General Semiconductor - Diodes Division	12	13.3	24.6	157	4000	DO-221AC (SlimSMA)	-55 to 175	Active
SMA6F12AHD-M3/6A	Vishay General Semiconductor - Diodes Division	12	13.2	22.9	157	4000	DO-221AC (SlimSMA)	-55 to 175	Active
SMA6J12A	Taiwan Semiconductor Corporation	12	13.3	18.8	31.9	600	DO-214AC (SMA)	-55 to 175	Active
SMA6J12A-E3/61	Vishay General Semiconductor - Diodes Division	12	13.3	24.6	157	4000	DO-214AC (SMA)	-55 to 150	Active
SMA6J12A-TR	STMicroelectronics	12	13.3	24.6	157	600	DO-214AC (SMA)	-55 to 175	Active

Engineering Selection Recommendations

Direct Equivalent Selection: SMAJ12A (Good-Ark Semiconductor), SMAJ12A-13-F (Diodes Incorporated), and SMAJ12A-E3/61 (Vishay) are functionally equivalent to SMAJ12A-TP. All three maintain identical electrical specifications and DO-214AC package compatibility. Selection among these options depends on supplier availability, lead time, and procurement cost. All are ROHS3 compliant with MSL 1 rating. The primary difference is maximum operating temperature: SMAJ12A-TP supports -55°C to 175°C, while the three equivalents are rated to -55°C to 150°C. For applications operating above 150°C, SMAJ12A-TP is the appropriate choice.

Similar Alternative Selection: SMA6J12A (Taiwan Semiconductor Corporation) and SMA6J12A-TR (STMicroelectronics) provide higher peak pulse current (31.9A and 157A respectively) and power dissipation (600W and 600W) while maintaining the 12V standoff voltage and DO-214AC package. These parts are suitable for applications requiring enhanced transient energy absorption. SMA6F12A-M3/6A and SMA6F12AHD-M3/6A use the DO-221AC (SlimSMA) package, which differs mechanically from DO-214AC and requires board layout modification. These parts offer significantly higher power dissipation (4000W) and peak pulse current (157A) for high-energy transient protection applications.

All listed parts are active products with ROHS3 compliance and MSL 1 rating, ensuring regulatory compliance and moisture handling compatibility with standard manufacturing processes.

Frequently Asked Questions (FAQ)

Q: Can SMAJ12A-TP be directly replaced with SMAJ12A from Good-Ark Semiconductor?

A: Yes, SMAJ12A is a direct equivalent. Both parts share identical electrical specifications (12V standoff, 13.3V breakdown, 19.9V clamping, 20.1A peak pulse, 400W power) and use the DO-214AC (SMA) package. The only difference is maximum operating temperature: SMAJ12A-TP operates to 175°C while SMAJ12A operates to 150°C. For applications within the -55°C to 150°C range, substitution is valid without circuit modification.

Q: What is the difference between SMAJ12A and SMA6J12A?

A: Both parts maintain 12V standoff voltage and 13.3V breakdown voltage, but differ in clamping voltage, peak pulse current, and power dissipation. SMAJ12A provides 19.9V clamping with 20.1A peak pulse and 400W power. SMA6J12A provides 18.8V clamping with 31.9A peak pulse and 600W power. SMA6J12A is suitable for applications requiring higher transient energy absorption. Both use DO-214AC (SMA) packages and are pin-compatible.

Q: Why do some substitute parts use DO-221AC (SlimSMA) instead of DO-214AC (SMA)?

A: DO-221AC (SlimSMA) is a different package form factor with different physical dimensions and lead configuration. Parts using this package (SMA6F12A-M3/6A, SMA6F12AHD-M3/6A) require board layout modification and cannot be used as direct pin-compatible replacements. These parts are selected only when higher power dissipation (4000W) is required for specific application demands.

Q: Are all substitute parts ROHS3 compliant?

A: Yes, all listed substitute parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the compliance profile of SMAJ12A-TP. This ensures compatibility with standard manufacturing processes and regulatory requirements.

Q: What parameters must remain constant for a valid substitution?

A: The critical parameters for valid substitution are Voltage - Reverse Standoff (12V), Voltage - Breakdown (minimum 13.3V), Package Type (DO-214AC/SMA for direct equivalents), and Mounting Type (Surface Mount). Clamping voltage, peak pulse current, and power dissipation may vary depending on application requirements, but changes to these parameters require circuit evaluation.

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