TZMC68-GS18 Equivalent & Substitute Parts

Part Overview

The TZMC68-GS18 is a Zener diode rated at 68 V nominal voltage with 500 mW maximum power dissipation, manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component is packaged in SOD-80 MiniMELF configuration and is qualified to AEC-Q101 automotive standards. The part is currently active in production with 951 pieces in stock. Substitute parts are identified when equivalent electrical and mechanical specifications are required for design flexibility, inventory management, or supply chain continuity while maintaining functional compatibility within the application circuit.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	68	V
Tolerance	±5%	—
Power - Max	500	mW
Impedance (Max)	200	Ohms
Current - Reverse Leakage @ Vr	100 nA @ 51 V	—
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA	—
Operating Temperature Range	-65°C to 175°C	—
Package / Case	DO-213AC, MINI-MELF, SOD-80	—
Mounting Type	Surface Mount	—
Grade	Automotive	—
Qualification	AEC-Q101	—

Substitute Part Grouping Explanation

Substitute parts for the TZMC68-GS18 are qualified based on the following critical parameters that determine functional equivalence:

Electrical Equivalence Criteria:

Zener voltage (Nom): 68 V
Maximum power dissipation: 500 mW
Impedance (Max): 200 Ohms
Reverse leakage current: 100 nA @ 51 V
Forward voltage: 1.5 V @ 200 mA
Operating temperature range: -65°C to 175°C

Mechanical & Packaging Equivalence Criteria:

Package type: SOD-80 MiniMELF (DO-213AC)
Mounting type: Surface Mount
Supplier device package: SOD-80 MiniMELF

Compliance & Quality Criteria:

Automotive grade qualification
AEC-Q101 certification
RoHS3 compliance
MSL rating: 1 (Unlimited)

Substitute parts must match all electrical parameters and maintain identical packaging and mounting specifications. Tolerance variations are permitted when the substitute part tolerance is equal to or tighter than the main part specification.

Parameter Comparison

Parameter	TZMC68-GS18	TZMC68-GS08	TZMB68-GS08
Manufacturer	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division
Category	Diodes, Zener	Diodes, Zener	Diodes, Zener
Voltage - Zener (Nom)	68 V	68 V	68 V
Tolerance	±5%	±5%	±2%
Power - Max	500 mW	500 mW	500 mW
Impedance (Max)	200 Ohms	200 Ohms	200 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 51 V	100 nA @ 51 V	100 nA @ 51 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA	1.5 V @ 200 mA	1.5 V @ 200 mA
Operating Temperature	-65°C to 175°C	-65°C to 175°C	-65°C to 175°C
Grade	Automotive	Automotive	Automotive
Qualification	AEC-Q101	AEC-Q101	AEC-Q101
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	DO-213AC, MINI-MELF, SOD-80	DO-213AC, MINI-MELF, SOD-80	DO-213AC, MINI-MELF, SOD-80
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Inventory Status	951 Pcs In Stock	35100 Pcs In Stock	42300 Pcs In Stock

Engineering Selection Recommendations

All three parts—TZMC68-GS18, TZMC68-GS08, and TZMB68-GS08—are functionally equivalent for applications requiring a 68 V, 500 mW Zener diode in SOD-80 MiniMELF packaging. Each part carries active product status, AEC-Q101 automotive qualification, and RoHS3 compliance.

TZMC68-GS18 and TZMC68-GS08 share identical electrical specifications with ±5% tolerance and differ only in packaging configuration (TR designation indicates Tape & Reel). Both are suitable for direct substitution in circuits where ±5% voltage tolerance is acceptable.

TZMB68-GS08 provides tighter voltage tolerance at ±2%, making it suitable for applications requiring improved voltage regulation accuracy. The TZMB series designation indicates this enhanced tolerance specification. This part is appropriate for selection when circuit design requires stricter Zener voltage control.

All parts maintain identical maximum power dissipation, impedance, reverse leakage characteristics, forward voltage specifications, and operating temperature range. Selection between these parts should be based on tolerance requirements and inventory availability rather than electrical performance differences.

Frequently Asked Questions (FAQ)

Q: Can TZMC68-GS08 directly replace TZMC68-GS18 in production?

A: Yes. Both parts share identical electrical specifications (68 V nominal, ±5% tolerance, 500 mW power rating) and packaging (SOD-80 MiniMELF). The primary difference is packaging format (Tape & Reel configuration). Direct substitution is valid for applications where ±5% voltage tolerance is specified.

Q: What is the difference between TZMC68-GS08 and TZMB68-GS08?

A: The TZMB68-GS08 provides ±2% voltage tolerance compared to the ±5% tolerance of TZMC68-GS08. All other electrical parameters, package type, and automotive qualifications are identical. Selection depends on circuit tolerance requirements.

Q: Are all three parts suitable for automotive applications?

A: Yes. All three parts carry automotive grade classification and AEC-Q101 qualification, meeting automotive industry standards for reliability and performance.

Q: Do these parts have identical moisture sensitivity ratings?

A: Yes. All three parts have MSL rating of 1 (Unlimited), indicating no moisture sensitivity restrictions for storage and handling.

Q: Can these parts be used interchangeably in the same PCB assembly?

A: Yes, provided the circuit design tolerance for Zener voltage is compatible with the selected part's tolerance specification. TZMB68-GS08 with ±2% tolerance is suitable for any application accepting TZMC parts with ±5% tolerance. The reverse substitution (TZMC for TZMB) requires circuit design verification.

Q: What is the significance of the SOD-80 MiniMELF package designation?

A: SOD-80 MiniMELF is the surface mount package type for all three parts. This package is standardized across all substitutes, ensuring mechanical and thermal compatibility on PCB layouts designed for this package footprint.

Q: Are there any compliance or regulatory differences between these parts?

A: No. All three parts are RoHS3 compliant, REACH unaffected, and carry identical ECCN (EAR99) and HTSUS classifications.

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