SMA6F8.0A-M3/6B Equivalent & Substitute Parts

Part Overview

The SMA6F8.0A-M3/6B is an active Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This unidirectional zener diode is designed for general-purpose transient voltage suppression in surface mount applications. The part operates across a temperature range of -55°C to 175°C and is RoHS3 compliant with unlimited moisture sensitivity rating (MSL 1). Finding equivalent or substitute parts may be necessary due to inventory constraints, packaging preferences, or supply chain requirements while maintaining functional compatibility.

Substiute Parts

SMA6F8.0A-M3/6B

Vishay General Semiconductor - Diodes DivisionIn Stock: 1143SMA6F8.0A-M3/6B Datasheet

Current PartRFQ

SMAJ8.0A-TP

Micro Commercial CoIn Stock: 3963SMAJ8.0A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMA6F8.0A-M3/6B is determined by strict alignment of the following critical electrical and mechanical parameters:

• Voltage - Reverse Standoff (Typ): 8V
• Voltage - Breakdown (Min): 8.89V
• Unidirectional zener diode configuration
• Surface mount technology
• Operating temperature range compatibility: -55°C to 175°C minimum
• RoHS3 compliance and MSL 1 rating

The substitute part SMAJ8.0A-TP meets these core electrical requirements. However, differences exist in clamping voltage, peak pulse current, and power dissipation ratings. These differences must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

Both the SMA6F8.0A-M3/6B and SMAJ8.0A-TP are active products with RoHS3 compliance and MSL 1 ratings, ensuring regulatory and environmental compatibility. The primary distinction lies in performance characteristics: the main part delivers significantly higher peak pulse current (220A versus 29.4A) and power dissipation (4000W versus 400W), with a higher clamping voltage (18.2V versus 13.6V).

Selection between these parts must be based on application-specific transient suppression requirements. The SMA6F8.0A-M3/6B is suitable for high-energy transient events requiring substantial current handling and power dissipation. The SMAJ8.0A-TP is appropriate for lower-energy transient suppression scenarios. Package differences (DO-221AC versus DO-214AC) may also influence PCB layout and design considerations.

Frequently Asked Questions (FAQ)

Q: Can SMAJ8.0A-TP directly replace SMA6F8.0A-M3/6B in all applications?

A: No. While both parts share the same 8V reverse standoff and 8.89V breakdown voltages, the SMAJ8.0A-TP has significantly lower peak pulse current (29.4A versus 220A) and power dissipation (400W versus 4000W) ratings. Substitution is valid only for applications where transient energy levels are within the SMAJ8.0A-TP specifications.

Q: What are the package differences between these parts?

A: The SMA6F8.0A-M3/6B uses DO-221AC (SlimSMA) packaging with flat leads, while the SMAJ8.0A-TP uses DO-214AC (SMA) packaging. These are different physical packages and require different PCB footprints.

Q: Are both parts compliant with current environmental and regulatory standards?

A: Yes. Both parts are RoHS3 compliant, REACH unaffected, and carry MSL 1 (unlimited moisture sensitivity) ratings, meeting current environmental and regulatory requirements.

Q: What is the significance of the clamping voltage difference?

A: The clamping voltage (18.2V for the main part versus 13.6V for the substitute) determines the maximum voltage that appears across the protected circuit during a transient event. The lower clamping voltage of the substitute may provide better protection in some applications but requires verification against circuit requirements.

Q: Can these parts be used interchangeably based on voltage ratings alone?

A: No. While both parts have identical reverse standoff (8V) and breakdown (8.89V) voltages, the current and power handling capabilities differ substantially. Application-specific transient energy requirements must be evaluated before substitution.