TZMB68-GS18 Equivalent & Substitute Parts

Part Overview

The TZMB68-GS18 is a 68 V, 500 mW Zener diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates across the automotive temperature range (-65°C to 175°C) and carries AEC-Q101 qualification. The part is actively produced and available in high volume. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, supply chain considerations, or design flexibility needs.

Substiute Parts

TZMB68-GS18

Vishay General Semiconductor - Diodes DivisionIn Stock: 936TZMB68-GS18 Datasheet

Current PartRFQ

TZMB68-GS08

Vishay General Semiconductor - Diodes DivisionIn Stock: 42337TZMB68-GS08 Datasheet

Parametric EquivalentRFQ

BZV55-C68,115

Nexperia USA Inc.In Stock: 3642BZV55-C68,115 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TZMB68-GS18 is determined by the following critical parameters:

Primary Substitution Criteria:

• Zener voltage: 68 V nominal
• Power dissipation: 500 mW maximum
• Package type: SOD-80 (DO-213AC, MINI-MELF)
• Mounting: Surface mount
• Operating temperature range compatibility
• RoHS3 compliance

Parametric Equivalent Classification: The TZMB68-GS08 is a parametric equivalent. Both parts share identical electrical specifications (68 V, 500 mW, ±2% tolerance, 200 Ohms impedance) and are from the same TZM series. The difference in part number suffix (-GS18 versus -GS08) reflects packaging reel configuration only, with no impact on component performance or functionality.

Manufacturer Recommended Substitute Classification: The BZV55-C68,115 is a manufacturer-recommended substitute from Nexperia USA Inc. This part meets the core functional requirements (68 V nominal, 500 mW power rating, SOD-80 package, surface mount) but operates within a broader temperature range (-65°C to 200°C) and carries different tolerance and impedance specifications. The ±5% tolerance and 240 Ohms maximum impedance represent acceptable variations for general-purpose zener diode applications.

Parameter Comparison

Engineering Selection Recommendations

TZMB68-GS08 Selection: The TZMB68-GS08 is the direct parametric equivalent and preferred substitute when TZMB68-GS18 availability is limited. Both parts are manufactured by Vishay, carry identical electrical specifications, AEC-Q101 qualification, and automotive-grade certification. The only distinction is the reel configuration suffix. This substitute requires no circuit redesign and maintains full compliance with automotive standards.

BZV55-C68,115 Selection: The BZV55-C68,115 is suitable as a secondary substitute when Vishay TZM series components are unavailable. This Nexperia part maintains the 68 V nominal voltage, 500 mW power rating, and SOD-80 package compatibility. The ±5% tolerance (versus ±2%) and 240 Ohms impedance represent acceptable deviations for applications where zener voltage regulation does not require tight tolerance control. The extended operating temperature range (-65°C to 200°C) provides additional thermal margin. This part does not carry automotive-grade or AEC-Q101 designation; selection for automotive applications requires design review and qualification assessment.

Frequently Asked Questions (FAQ)

Q: Can TZMB68-GS08 be used as a direct replacement for TZMB68-GS18?

A: Yes. Both parts are electrically and mechanically identical. The suffix difference (-GS18 versus -GS08) indicates reel configuration only and does not affect component performance, electrical characteristics, or package dimensions.

Q: What is the primary difference between TZMB68-GS18 and BZV55-C68,115?

A: The primary differences are manufacturer (Vishay versus Nexperia), tolerance specification (±2% versus ±5%), impedance (200 Ohms versus 240 Ohms maximum), and automotive qualification status. The TZMB68-GS18 carries AEC-Q101 certification; the BZV55-C68,115 does not. Both maintain 68 V nominal voltage, 500 mW power rating, and SOD-80 package compatibility.

Q: Is the BZV55-C68,115 suitable for automotive applications?

A: The BZV55-C68,115 is not designated as automotive-grade and does not carry AEC-Q101 qualification. Use in automotive applications requires design review and qualification assessment by the design authority.

Q: Do all three parts use the same package?

A: Yes. All three parts use the SOD-80 package (DO-213AC, MINI-MELF) and are surface mount components. They are mechanically and footprint-compatible.

Q: What tolerance difference exists between the main part and the recommended substitute?

A: The TZMB68-GS18 and TZMB68-GS08 both specify ±2% tolerance. The BZV55-C68,115 specifies ±5% tolerance. This represents a wider acceptable voltage variation range for the Nexperia part.

Q: Are all three parts RoHS3 compliant?

A: Yes. All three parts carry ROHS3 compliance status.

Q: What is the temperature operating range difference?

A: The TZMB68-GS18 and TZMB68-GS08 operate from -65°C to 175°C. The BZV55-C68,115 operates from -65°C to 200°C, providing a 25°C higher upper temperature limit.