TPSMA6.8HE3/5AT Equivalent & Substitute Parts

Part Overview

The TPSMA6.8HE3/5AT is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, designed for surface mount applications in the DO-214AC (SMA) package. This component provides transient overvoltage protection with a 5.5V reverse standoff voltage and 10.8V maximum clamping voltage at peak pulse current. The part is classified as obsolete, necessitating identification of functionally equivalent alternatives that maintain electrical performance and compliance requirements for new designs or production continuity.

Substiute Parts

TPSMA6.8HE3/5AT

Vishay General Semiconductor - Diodes DivisionIn Stock: 790TPSMA6.8HE3/5AT Datasheet

Current PartRFQ

PTVS6V0S1UR,115

Nexperia USA Inc.In Stock: 18780PTVS6V0S1UR,115 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TPSMA6.8HE3/5AT is determined by the following critical electrical and mechanical parameters:

• Voltage - Reverse Standoff: 5.5V to 6V range (allows minor tolerance variation)
• Voltage - Clamping (Max) @ Ipp: 10.3V to 10.8V range (maintains transient suppression performance)
• Current - Peak Pulse: 37A to 38.8A range (ensures adequate surge handling capacity)
• Power - Peak Pulse: 400W (consistent dissipation capability)
• Unidirectional Channels: 1 (single diode configuration)
• Type: Zener (TVS diode technology)
• Grade: Automotive (AEC-Q101 qualified)
• RoHS Status: ROHS3 Compliant

The PTVS6V0S1UR,115 meets these substitution criteria with compatible electrical performance and automotive qualification, though it uses a different surface mount package (SOD-123W instead of DO-214AC).

Parameter Comparison

Engineering Selection Recommendations

The PTVS6V0S1UR,115 is a functionally equivalent substitute for the obsolete TPSMA6.8HE3/5AT based on the following factors:

Both components maintain AEC-Q101 automotive qualification and ROHS3 compliance, ensuring regulatory and quality standards are preserved. The electrical parameters remain within acceptable operating ranges: the substitute's 6V reverse standoff voltage and 10.3V clamping voltage are compatible with the original 5.5V and 10.8V specifications, with peak pulse current capability (38.8A) exceeding the original requirement (37A). Both devices dissipate 400W peak pulse power and feature unlimited moisture sensitivity rating.

The primary design consideration is the package change from DO-214AC (SMA) to SOD-123W. This requires PCB layout modification and verification of mechanical fit within the assembly. The substitute part is currently in active production with higher inventory availability (18,760 pcs vs. 705 pcs), supporting supply chain continuity.

The operating temperature range differs: the original part supports -65°C to 185°C (junction temperature), while the substitute operates -55°C to 150°C (ambient temperature). Design validation is required if the application demands the extended lower temperature performance of the original part.

Frequently Asked Questions (FAQ)

Q: Can PTVS6V0S1UR,115 directly replace TPSMA6.8HE3/5AT without circuit modification?

A: Electrical substitution is valid based on voltage and current parameters. However, the package change from DO-214AC to SOD-123W requires PCB layout redesign. Mechanical fit, trace routing, and thermal management must be re-evaluated for the new package footprint.

Q: What is the significance of the voltage parameter differences (5.5V vs. 6V standoff)?

A: The 0.5V difference in reverse standoff voltage falls within normal manufacturing tolerance for TVS diodes. Both parts suppress transients to similar clamping voltages (10.8V vs. 10.3V), maintaining circuit protection performance. Circuit simulation should confirm compatibility with specific overvoltage thresholds.

Q: Are both parts suitable for automotive applications?

A: Yes. Both TPSMA6.8HE3/5AT and PTVS6V0S1UR,115 carry AEC-Q101 qualification and automotive grade designation, meeting automotive reliability and quality standards.

Q: Why does the substitute part have a lower maximum operating temperature?

A: The original part specifies junction temperature (TJ) range of -65°C to 185°C, while the substitute specifies ambient temperature (TA) range of -55°C to 150°C. These are different measurement references. Actual junction temperature of the substitute may exceed its ambient rating depending on power dissipation and thermal design. Thermal analysis is required for high-temperature applications.

Q: Is the package change from SMA to SOD-123W a significant design constraint?

A: Yes. SOD-123W is a smaller package than DO-214AC (SMA). PCB footprint, component placement, and thermal dissipation paths must be re-evaluated. Verify that the new package meets space and thermal requirements for your application.

Q: Are both parts RoHS compliant?

A: Yes. Both TPSMA6.8HE3/5AT and PTVS6V0S1UR,115 are ROHS3 compliant with unlimited moisture sensitivity rating (MSL 1), suitable for standard manufacturing and storage conditions.