SMA6F8.5A-M3/6B Equivalent & Substitute Parts

Part Overview

The SMA6F8.5A-M3/6B is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This component is part of the TransZorb® series and is designed for general-purpose transient voltage suppression applications. The device features an 8.5V reverse standoff voltage with an 18.7V maximum clamping voltage and peak pulse current capability of 205A (8/20µs). The part is currently in active production status with RoHS3 compliance and unlimited moisture sensitivity level (MSL 1). Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter ranges for this product category.

Substiute Parts

SMA6F8.5A-M3/6B

Vishay General Semiconductor - Diodes DivisionIn Stock: 1107SMA6F8.5A-M3/6B Datasheet

Current PartRFQ

SMAJ8.5A-TP

Micro Commercial CoIn Stock: 6552SMAJ8.5A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMA6F8.5A-M3/6B are identified based on the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Voltage - Reverse Standoff (Typ): 8.5V (exact match required)
• Voltage - Breakdown (Min): within acceptable range for the application
• Unidirectional channel configuration: 1 channel (single diode)
• Type: Zener TVS diode
• Applications: General Purpose

Mechanical Compatibility Criteria:

• Mounting Type: Surface Mount
• Package Category: DO-221AC or equivalent SMA-class packages
• Supplier Device Package: DO-221AC (SlimSMA) or DO-214AC (SMA)

Compliance & Status Criteria:

• Product Status: Active
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level: 1 (Unlimited)

The SMAJ8.5A-TP meets the core electrical requirements with matching 8.5V reverse standoff voltage and compatible breakdown voltage. Both parts operate across the same temperature range (-55°C to 175°C) and maintain RoHS3 compliance. Package compatibility is maintained within the SMA form factor category, allowing for direct substitution in surface-mount applications where the specified electrical performance parameters are acceptable.

Parameter Comparison

Engineering Selection Recommendations

Both the SMA6F8.5A-M3/6B and SMAJ8.5A-TP are active production components with ROHS3 compliance and MSL 1 rating, ensuring equivalent regulatory and environmental compliance for general-purpose TVS applications.

The primary distinction between these parts lies in their peak pulse current and power dissipation capabilities. The SMA6F8.5A-M3/6B provides 205A peak pulse current with 4000W peak pulse power, while the SMAJ8.5A-TP provides 27.7A peak pulse current with 400W peak pulse power. The clamping voltage also differs: 18.7V for the SMA6F8.5A-M3/6B versus 14.4V for the SMAJ8.5A-TP.

Selection between these parts must be based on the specific application requirements for peak pulse current handling and power dissipation. Both parts share the same 8.5V reverse standoff voltage and compatible breakdown voltage characteristics, maintaining electrical compatibility for the core TVS function. Package form factors are both within the SMA category for surface-mount applications.

Frequently Asked Questions (FAQ)

Q: Can the SMAJ8.5A-TP directly replace the SMA6F8.5A-M3/6B in all applications?

A: Direct substitution is limited by peak pulse current and power dissipation ratings. The SMAJ8.5A-TP is rated for 27.7A peak pulse current and 400W peak pulse power, compared to 205A and 4000W for the SMA6F8.5A-M3/6B. Substitution is valid only when the application's transient current and power requirements do not exceed the SMAJ8.5A-TP specifications.

Q: Are the package dimensions compatible between DO-221AC (SlimSMA) and DO-214AC (SMA)?

A: Both packages are within the SMA form factor category for surface-mount applications. However, DO-221AC (SlimSMA) and DO-214AC (SMA) have different physical dimensions. PCB layout and footprint compatibility must be verified before substitution.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the SMA6F8.5A-M3/6B and SMAJ8.5A-TP are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity level, ensuring equivalent regulatory compliance for general-purpose applications.

Q: What is the significance of the 8.5V reverse standoff voltage match?

A: The 8.5V reverse standoff voltage is the primary electrical parameter that defines the TVS protection threshold. Both parts share this specification, ensuring they respond to transient events at the same voltage level. This is a mandatory requirement for functional equivalence in TVS applications.

Q: How do the clamping voltage differences affect substitution?

A: The clamping voltage (18.7V vs. 14.4V) determines the maximum voltage the protected circuit experiences during a transient event. The lower clamping voltage of the SMAJ8.5A-TP provides tighter voltage regulation but with reduced current handling capacity. Application requirements for both voltage clamping and current capacity must be evaluated.