TZMB12-GS18 Equivalent & Substitute Parts

Part Overview

The TZMB12-GS18 is an automotive-grade Zener diode manufactured by Vishay General Semiconductor - Diodes Division. This component operates at a nominal Zener voltage of 12 V with a maximum power dissipation of 500 mW in a surface mount SOD-80 MiniMELF package. The device is AEC-Q101 qualified and RoHS3 compliant, making it suitable for automotive applications requiring voltage regulation and transient protection. The part is currently in active production status with substantial inventory availability. Equivalent substitute parts are identified based on matching electrical specifications, mechanical packaging, and automotive qualification requirements.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	12	V
Tolerance	±2%	%
Power - Max	500	mW
Impedance (Max)	20	Ohms
Current - Reverse Leakage @ Vr	100	nA @ 9.1 V
Voltage - Forward (Vf) (Max) @ If	1.5	V @ 200 mA
Operating Temperature	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 TZMB12-GS18 are identified through strict parametric matching across the following critical specifications:

Electrical Parameters:

Nominal Zener voltage of 12 V
Voltage tolerance of ±2%
Maximum power dissipation of 500 mW
Maximum impedance of 20 Ohms
Reverse leakage current of 100 nA @ 9.1 V
Forward voltage of 1.5 V maximum @ 200 mA

Mechanical & Packaging Parameters:

Surface mount technology
SOD-80 MiniMELF package (DO-213AC)

Compliance & Qualification:

Automotive grade classification
AEC-Q101 qualification
RoHS3 compliance
Active product status

Substitute parts must match all electrical parameters within the specified tolerances and maintain identical packaging and mounting characteristics. Automotive qualification and AEC-Q101 certification are mandatory for substitution eligibility.

Parameter Comparison

Parameter	TZMB12-GS18	TZMB12-GS08	Match
Voltage - Zener (Nom)	12 V	12 V	✓
Tolerance	±2%	±2%	✓
Power - Max	500 mW	500 mW	✓
Impedance (Max)	20 Ohms	20 Ohms	✓
Current - Reverse Leakage @ Vr	100 nA @ 9.1 V	100 nA @ 9.1 V	✓
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA	1.5 V @ 200 mA	✓
Operating Temperature	175°C	175°C	✓
Package / Case	DO-213AC, MINI-MELF, SOD-80	DO-213AC, MINI-MELF, SOD-80	✓
Mounting Type	Surface Mount	Surface Mount	✓
Grade	Automotive	Automotive	✓
Qualification	AEC-Q101	AEC-Q101	✓
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	✓
Series	TZM	TZM	✓

Engineering Selection Recommendations

The TZMB12-GS08 is a direct parametric equivalent to the TZMB12-GS18. Both components are manufactured by Vishay General Semiconductor - Diodes Division within the TZM series and share identical electrical specifications, mechanical packaging, and automotive qualifications.

Selection Basis:

Both parts maintain active product status and carry full AEC-Q101 automotive qualification with RoHS3 compliance. The electrical performance is identical across all specified parameters: 12 V nominal Zener voltage, ±2% tolerance, 500 mW maximum power dissipation, 20 Ohms maximum impedance, and matching forward and reverse characteristics.

The primary distinction between these parts is inventory availability. The TZMB12-GS08 maintains higher stock levels (50,000 pieces) compared to the TZMB12-GS18 (8,971 pieces), making it suitable for applications where supply continuity is a consideration.

Both parts are qualified for identical operating conditions and circuit applications. Selection between these equivalents is based on procurement requirements and supply chain considerations rather than technical performance differences.

Frequently Asked Questions (FAQ)

Q: Can TZMB12-GS08 be used as a direct replacement for TZMB12-GS18?

A: Yes. The TZMB12-GS08 is a parametric equivalent with identical electrical specifications, mechanical packaging, and automotive qualifications. All electrical parameters, including Zener voltage, power rating, impedance, and temperature characteristics, match exactly.

Q: Are there any package or mounting differences between these parts?

A: No. Both components use the SOD-80 MiniMELF package (DO-213AC) with surface mount technology. PCB footprints and assembly processes are identical.

Q: Do both parts carry the same automotive qualifications?

A: Yes. Both TZMB12-GS18 and TZMB12-GS08 are AEC-Q101 qualified automotive-grade components with RoHS3 compliance and REACH unaffected status.

Q: What is the difference between these two part numbers?

A: The parts are electrically and mechanically identical. The difference in part numbering (GS18 versus GS08) reflects internal Vishay manufacturing or distribution designations. Both are from the same TZM series and share the base product number TZMB12.

Q: Are the electrical characteristics guaranteed to be identical?

A: Yes. Both parts specify identical nominal Zener voltage (12 V), tolerance (±2%), maximum power dissipation (500 mW), impedance (20 Ohms maximum), reverse leakage current (100 nA @ 9.1 V), and forward voltage characteristics (1.5 V @ 200 mA).

Q: Can these parts be used interchangeably in automotive circuits?

A: Yes. Both parts meet automotive-grade requirements and AEC-Q101 qualification standards. They are suitable for identical circuit applications requiring 12 V Zener regulation or transient protection in automotive environments.

Q: What is the maximum operating temperature for both parts?

A: Both components are rated for a maximum operating temperature of 175°C.

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