SMA6F12A-M3/6B Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SMA6F12A-M3/6B is an active Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This unidirectional zener-type TVS diode is designed for general-purpose transient voltage protection in surface-mount applications. The device features a 12V reverse standoff voltage with a 23.5V maximum clamping voltage and peak pulse current capability of 157A (8/20µs), delivering 4000W peak pulse power dissipation. Packaged in the DO-221AC (SlimSMA) form factor with SMA flat leads, the SMA6F12A-M3/6B operates across the temperature range of -55°C to 175°C (TJ) and maintains ROHS3 compliance with MSL 1 rating. Finding equivalent or substitute parts may be necessary due to inventory constraints, supply chain availability, or specific application requirements while maintaining electrical and mechanical compatibility.

Substiute Parts

SMA6F12A-M3/6B

Vishay General Semiconductor - Diodes DivisionIn Stock: 816SMA6F12A-M3/6B Datasheet

Current PartRFQ

SMA6F12A-M3/6A

Vishay General Semiconductor - Diodes DivisionIn Stock: 10408SMA6F12A-M3/6A Datasheet

DirectRFQ

SMAJ12A-TP

Micro Commercial CoIn Stock: 5988SMAJ12A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMA6F12A-M3/6B are qualified based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

• Voltage - Reverse Standoff (Typ): 12V
• Voltage - Breakdown (Min): 13.3V
• Unidirectional zener-type TVS diode configuration
• Surface-mount packaging with compatible form factors
• Operating temperature range: -55°C to 175°C minimum
• ROHS3 compliance and MSL 1 rating

Substitute Parts Identified:

1. SMA6F12A-M3/6A (Vishay General Semiconductor - Diodes Division): Direct equivalent with identical electrical specifications, same DO-221AC (SlimSMA) package, and matching performance parameters.

2. SMAJ12A-TP (Micro Commercial Co): Qualified substitute with matching 12V reverse standoff and 13.3V minimum breakdown voltage. Operates within the same temperature range with ROHS3 compliance. Package variant is DO-214AC (SMA) with different mechanical form factor but compatible surface-mount application.

Parameter Comparison

Engineering Selection Recommendations

SMA6F12A-M3/6A Selection: This part is a direct equivalent to the SMA6F12A-M3/6B with identical electrical performance specifications and mechanical packaging. Both devices are manufactured by Vishay General Semiconductor - Diodes Division, maintain active product status, and carry ROHS3 compliance with MSL 1 rating. Selection of SMA6F12A-M3/6A is appropriate when supply availability of the primary part number is constrained while maintaining full functional and compliance equivalence.

SMAJ12A-TP Selection: This part qualifies as a substitute based on matching voltage specifications (12V reverse standoff, 13.3V minimum breakdown) and operating temperature range (-55°C to 175°C). Both devices maintain ROHS3 compliance and MSL 1 rating with active product status. The SMAJ12A-TP is manufactured by Micro Commercial Co and uses the DO-214AC (SMA) package instead of DO-221AC (SlimSMA). The peak pulse current rating (20.1A) and power dissipation (400W) are lower than the main part, making this substitute suitable for applications with reduced transient energy requirements. PCB layout and footprint modifications are required due to package form factor differences.

Frequently Asked Questions (FAQ)

Q: Can SMA6F12A-M3/6A be used as a direct replacement for SMA6F12A-M3/6B?

A: Yes. SMA6F12A-M3/6A is a direct equivalent with identical electrical specifications, package type (DO-221AC SlimSMA), and performance characteristics. No design modifications are required.

Q: What are the key differences between SMA6F12A-M3/6B and SMAJ12A-TP?

A: Both devices share the same 12V reverse standoff voltage and 13.3V minimum breakdown voltage. The primary differences are: (1) Package form factor—SMA6F12A-M3/6B uses DO-221AC (SlimSMA) while SMAJ12A-TP uses DO-214AC (SMA), requiring different PCB footprints; (2) Peak pulse current—SMA6F12A-M3/6B handles 157A versus SMAJ12A-TP at 20.1A; (3) Power dissipation—SMA6F12A-M3/6B rated at 4000W versus SMAJ12A-TP at 400W; (4) Clamping voltage—SMA6F12A-M3/6B clamps at 23.5V maximum versus SMAJ12A-TP at 19.9V.

Q: Is SMAJ12A-TP suitable for all applications using SMA6F12A-M3/6B?

A: SMAJ12A-TP is suitable only for applications where transient energy levels do not exceed 400W peak pulse power and peak pulse currents remain below 20.1A. Applications requiring the full 4000W power dissipation or 157A peak pulse current capability of the SMA6F12A-M3/6B cannot use SMAJ12A-TP as a substitute.

Q: Are there packaging considerations when substituting with SMAJ12A-TP?

A: Yes. SMAJ12A-TP uses DO-214AC (SMA) package while SMA6F12A-M3/6B uses DO-221AC (SlimSMA) package. These packages have different mechanical dimensions and PCB footprints. Design layout modifications and component placement adjustments are necessary for SMAJ12A-TP integration.

Q: Do all substitute parts maintain the same compliance certifications?

A: Yes. SMA6F12A-M3/6A and SMAJ12A-TP both maintain ROHS3 compliance, MSL 1 rating, and active product status, matching the compliance profile of SMA6F12A-M3/6B.

Q: What is the operating temperature specification difference between the main part and SMAJ12A-TP?

A: SMA6F12A-M3/6B specifies operating temperature as -55°C to 175°C (TJ—junction temperature), while SMAJ12A-TP specifies -55°C to 175°C (TA—ambient temperature). Both devices support the same temperature range; the measurement reference differs between junction and ambient conditions.