SMA6F12A-TP Equivalent & Substitute Parts

Part Overview

The SMA6F12A-TP is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Micro Commercial Co, designed for general-purpose overvoltage protection applications. This component features a 12V reverse standoff voltage with an 18.5V maximum clamping voltage and 31A peak pulse current capability in a surface-mount DO-221AC (SMA Flat Leads) package. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	SMA6F12A-TP
Manufacturer	Micro Commercial Co
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Unidirectional Channels	1
Voltage - Reverse Standoff (Typ)	12V
Voltage - Breakdown (Min)	13.3V
Voltage - Clamping (Max) @ Ipp	18.5V
Current - Peak Pulse (10/1000µs)	31A
Power - Peak Pulse	600W
Operating Temperature	-55°C ~ 175°C (TA)
Mounting Type	Surface Mount
Package / Case	DO-221AC, SMA Flat Leads
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the SMA6F12A-TP is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): Must be 12V to maintain circuit protection threshold
Voltage - Breakdown (Min): Must be 13.3V to ensure consistent trigger characteristics
Unidirectional Channels: Must be 1 channel for single-line protection
Mounting Type: Must be Surface Mount for PCB compatibility
Package Compatibility: DO-221AC (SMA Flat Leads) or equivalent SMA packages acceptable

The substitute parts identified below meet these core electrical and mechanical requirements while offering active product status and improved availability compared to the obsolete SMA6F12A-TP.

Parameter Comparison

Parameter	SMA6F12A-TP	SMA6J12AFL-TP	SM4T14AY	SMAJ12A-TR
Manufacturer	Micro Commercial Co	Micro Commercial Co	STMicroelectronics	STMicroelectronics
Product Status	Obsolete	Active	Active	Active
Voltage - Reverse Standoff (Typ)	12V	12V	12V	12V
Voltage - Breakdown (Min)	13.3V	13.3V	13.3V	13.3V
Voltage - Clamping (Max) @ Ipp	18.5V	19.9V	25.3V	25.3V
Current - Peak Pulse (10/1000µs)	31A	30.1A	91A (8/20µs)	91A (8/20µs)
Power - Peak Pulse	600W	600W	400W	400W
Operating Temperature	-55°C ~ 175°C (TA)	-55°C ~ 150°C (TJ)	-55°C ~ 150°C (TJ)	-55°C ~ 150°C (TJ)
Package / Case	DO-221AC, SMA Flat Leads	DO-221AC, SMA Flat Leads	DO-214AC, SMA	DO-214AC, SMA
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount

Engineering Selection Recommendations

Primary Substitute: SMA6J12AFL-TP

The SMA6J12AFL-TP is the closest functional equivalent to the SMA6F12A-TP. Both parts are manufactured by Micro Commercial Co with identical reverse standoff and breakdown voltages. The SMA6J12AFL-TP maintains the same DO-221AC package footprint and offers superior product status (Active vs. Obsolete). Clamping voltage differential (19.9V vs. 18.5V) and peak pulse current (30.1A vs. 31A) remain within acceptable engineering tolerance for general-purpose protection circuits. This part is ROHS3 compliant and carries unlimited moisture sensitivity rating.

Secondary Substitutes: SM4T14AY and SMAJ12A-TR

Both STMicroelectronics parts (SM4T14AY and SMAJ12A-TR) meet core voltage specifications with 12V reverse standoff and 13.3V minimum breakdown voltages. These alternatives employ the DO-214AC (SMA) package, which is mechanically compatible with SMA Flat Leads applications. Both parts are ROHS3 compliant and carry AEC-Q101 automotive qualification (SM4T14AY). Higher clamping voltages (25.3V) and peak pulse currents (91A at 8/20µs) provide enhanced transient suppression capability. Operating temperature range is reduced to -55°C ~ 150°C (TJ), which may require thermal analysis in high-temperature applications. These parts offer significantly higher inventory availability.

Frequently Asked Questions (FAQ)

Q: Can SMA6J12AFL-TP directly replace SMA6F12A-TP without circuit modification?

A: Yes. Both parts share identical reverse standoff voltage (12V), breakdown voltage (13.3V), and package footprint (DO-221AC, SMA Flat Leads). The marginal differences in clamping voltage and peak pulse current do not require circuit redesign for general-purpose protection applications.

Q: What is the difference between DO-221AC and DO-214AC packages?

A: Both are surface-mount SMA packages with compatible footprints. DO-221AC (SMA Flat Leads) is used by Micro Commercial Co parts; DO-214AC (SMA) is the STMicroelectronics equivalent. PCB layout compatibility is maintained across both package designations.

Q: Why do SM4T14AY and SMAJ12A-TR have higher clamping voltages?

A: These STMicroelectronics parts are designed for broader transient suppression applications. Higher clamping voltage (25.3V vs. 18.5V) provides additional margin in circuits with higher transient energy. Peak pulse current capability (91A vs. 31A) offers enhanced protection for higher-impedance signal lines.

Q: Are there temperature rating implications when substituting with STMicroelectronics parts?

A: Yes. SMA6F12A-TP operates to 175°C (TA), while SM4T14AY and SMAJ12A-TR are rated to 150°C (TJ). Applications requiring operation above 150°C junction temperature must retain the original part or SMA6J12AFL-TP.

Q: What is the packaging difference between SMA6J12AFL-TP and SMAJ12A-TR?

A: SMA6J12AFL-TP is supplied in Tape & Reel (TR) format. SMAJ12A-TR is available in Cut Tape (CT) & Digi-Reel® format. Both are surface-mount compatible; packaging selection depends on assembly process requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. SMA6J12AFL-TP, SM4T14AY, and SMAJ12A-TR are all ROHS3 compliant with unlimited moisture sensitivity rating (MSL 1).

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