STZC6.8NT146 Equivalent & Substitute Parts

Part Overview

The STZC6.8NT146 is a transient voltage suppressor (TVS) diode manufactured by Rohm Semiconductor, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 4.6V reverse standoff voltage and is housed in an SMD3 package (TO-236-3/SC-59/SOT-23-3). The part is currently in active production status with 1,560 units available in inventory.

Identifying equivalent and substitute parts becomes necessary when the primary component experiences supply constraints, when design revisions require alternative package configurations, or when enhanced performance specifications are required for specific application requirements.

Substiute Parts

STZC6.8NT146

Rohm SemiconductorIn Stock: 1662STZC6.8NT146 Datasheet

Current PartRFQ

EMZC6.8NTL

Rohm SemiconductorIn Stock: 2660EMZC6.8NTL Datasheet

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MMBZ6V8ALYT116

Rohm SemiconductorIn Stock: 5359MMBZ6V8ALYT116 Datasheet

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PESD5V2S2UT,215

Nexperia USA Inc.In Stock: 102995PESD5V2S2UT,215 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the STZC6.8NT146 are selected based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

• Voltage - Reverse Standoff (Typ): 4.6V to 5V range
• Voltage - Breakdown (Min): 6.4V to 6.65V range
• Package / Case: TO-236-3, SC-59, SOT-23-3 (physical compatibility)
• Mounting Type: Surface Mount
• RoHS Status: ROHS3 Compliant
• Type: Zener diode

Secondary Considerations:

• Channel configuration (unidirectional vs. bidirectional)
• Product status (active vs. not for new designs)
• Inventory availability

The three substitute parts identified—EMZC6.8NTL, MMBZ6V8ALYT116, and PESD5V2S2UT,215—all meet the core electrical and mechanical compatibility requirements within the specified parameter ranges.

Parameter Comparison

Engineering Selection Recommendations

MMBZ6V8ALYT116 is the preferred substitute when direct replacement is required. This part maintains the same package configuration (TO-236-3/SC-59/SOT-23-3), is manufactured by Rohm Semiconductor, and carries active product status. The reverse standoff voltage of 4.5V (Max) and breakdown voltage of 6.46V remain within acceptable operating parameters for applications designed around the STZC6.8NT146. This part offers enhanced specifications including 2.5A peak pulse current and 24W peak pulse power, providing additional margin for transient protection.

PESD5V2S2UT,215 is suitable for applications requiring higher performance specifications. Manufactured by Nexperia USA Inc., this part features a 5V reverse standoff voltage and 20V clamping voltage, with significantly higher peak pulse current (15A at 8/20µs) and power dissipation (260W). This part is AEC-Q100 qualified and automotive-grade, making it appropriate for demanding industrial and automotive applications. The package remains compatible (TO-236-3/SC-59/SOT-23-3).

EMZC6.8NTL is not recommended for new designs due to its "Not For New Designs" product status, despite matching the 4.6V reverse standoff voltage specification. This part uses an alternative package configuration (SC-75/SOT-416), which requires PCB layout modifications and is incompatible with existing footprints designed for the STZC6.8NT146.

Frequently Asked Questions (FAQ)

Q: Can MMBZ6V8ALYT116 be used as a direct drop-in replacement for STZC6.8NT146?

A: Yes. Both parts share the same package configuration (TO-236-3/SC-59/SOT-23-3) and are manufactured by Rohm Semiconductor. The reverse standoff voltage difference (4.5V vs. 4.6V) and breakdown voltage (6.46V vs. 6.47V) fall within acceptable substitution parameters for general-purpose TVS applications. No PCB modifications are required.

Q: What is the key difference between PESD5V2S2UT,215 and STZC6.8NT146?

A: The primary differences are the reverse standoff voltage (5V vs. 4.6V), clamping voltage (20V vs. unspecified), and peak pulse current capability (15A vs. unspecified). PESD5V2S2UT,215 is designed for higher-energy transient events and includes automotive-grade qualification (AEC-Q100). Both parts use compatible packages.

Q: Why is EMZC6.8NTL not recommended despite matching the 4.6V specification?

A: EMZC6.8NTL carries a "Not For New Designs" product status and uses a different package configuration (SC-75/SOT-416) compared to the STZC6.8NT146 (TO-236-3/SC-59/SOT-23-3). This package incompatibility requires PCB redesign and footprint changes, making it unsuitable for direct substitution in existing designs.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. STZC6.8NT146, EMZC6.8NTL, MMBZ6V8ALYT116, and PESD5V2S2UT,215 are all ROHS3 compliant with MSL rating of 1 (Unlimited).

Q: Which substitute part has the highest inventory availability?

A: PESD5V2S2UT,215 has the highest inventory with 102,926 units in stock, followed by MMBZ6V8ALYT116 with 5,264 units. STZC6.8NT146 has 1,560 units available.