TZMB39-GS18 Equivalent & Substitute Parts

Part Overview

The TZMB39-GS18 is a Zener diode rated at 39 V nominal voltage with 500 mW power dissipation, manufactured by Vishay General Semiconductor - Diodes Division. This component is designed for surface mount applications in the SOD-80 MiniMELF package and is qualified to automotive standards (AEC-Q101). The part is currently in active production status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained across the same voltage rating, power rating, tolerance, and package specifications. Identifying suitable alternatives ensures design flexibility, supply chain continuity, and procurement optimization.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	39	V
Tolerance	±2	%
Power - Max	500	mW
Impedance (Max)	90	Ohms
Current - Reverse Leakage @ Vr	100 nA @ 30 V	nA
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA	V
Operating Temperature Range	-65 to 175	°C
Package / Case	DO-213AC, MINI-MELF, SOD-80	—
Mounting Type	Surface Mount	—
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—
MSL Rating	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution eligibility for the TZMB39-GS18 is determined by strict equivalence across the following critical parameters:

Zener Voltage (Nom): 39 V
Tolerance: ±2%
Power Rating: 500 mW
Impedance (Max): 90 Ohms
Reverse Leakage Current: 100 nA @ 30 V
Forward Voltage: 1.5 V @ 200 mA
Operating Temperature Range: -65°C to 175°C
Package: SOD-80 MiniMELF (DO-213AC)
Mounting Type: Surface Mount
Automotive Grade: AEC-Q101 qualified
Compliance: RoHS3 compliant, MSL 1

Substitute parts must match all electrical specifications and maintain identical package and mounting characteristics. The primary difference between the main part and its substitute is the packaging format (Tape & Reel versus Cut Tape & Digi-Reel), which does not affect electrical performance or circuit compatibility.

Parameter Comparison

Parameter	TZMB39-GS18 (Main)	TZMB39-GS08 (Substitute)	Match
Voltage - Zener (Nom)	39 V	39 V	✓
Tolerance	±2%	±2%	✓
Power - Max	500 mW	500 mW	✓
Impedance (Max)	90 Ohms	90 Ohms	✓
Current - Reverse Leakage @ Vr	100 nA @ 30 V	100 nA @ 30 V	✓
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA	1.5 V @ 200 mA	✓
Operating Temperature Range	-65°C to 175°C	-65°C to 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	✓
MSL Rating	1 (Unlimited)	1 (Unlimited)	✓
Packaging Format	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®	Different

Engineering Selection Recommendations

The TZMB39-GS08 is a direct electrical and mechanical equivalent to the TZMB39-GS18. Both parts are manufactured by Vishay General Semiconductor - Diodes Division within the TZM series and share identical electrical characteristics, thermal performance, and package specifications.

Both parts maintain active product status and carry full automotive qualification (AEC-Q101) with RoHS3 compliance. The MSL 1 rating on both components indicates unlimited shelf life under standard storage conditions, eliminating moisture-related handling constraints.

The sole distinction between these parts is the supply format: the TZMB39-GS18 is supplied in Tape & Reel format, while the TZMB39-GS08 is available in Cut Tape and Digi-Reel formats. This difference affects procurement and assembly logistics but does not impact electrical performance, thermal characteristics, or circuit functionality.

Selection between these parts should be based on supply chain availability, packaging requirements for assembly processes, and inventory management practices. Both parts are suitable for direct substitution in circuit designs without modification to PCB layouts, thermal management, or electrical design parameters.

Frequently Asked Questions (FAQ)

Q: Can TZMB39-GS08 be used as a direct replacement for TZMB39-GS18 in production?

A: Yes. Both parts are electrically and mechanically identical. The TZMB39-GS08 can be substituted directly without circuit redesign, PCB layout changes, or performance degradation. The difference in packaging format (Tape & Reel versus Cut Tape & Digi-Reel) does not affect component functionality.

Q: Are there any thermal or electrical performance differences between these parts?

A: No. Both parts share identical specifications for zener voltage (39 V), power rating (500 mW), impedance (90 Ohms), reverse leakage current (100 nA @ 30 V), forward voltage (1.5 V @ 200 mA), and operating temperature range (-65°C to 175°C).

Q: Do both parts meet automotive qualification requirements?

A: Yes. Both TZMB39-GS18 and TZMB39-GS08 are AEC-Q101 qualified and carry automotive grade designation. Both are RoHS3 compliant with MSL 1 rating.

Q: What is the difference between Tape & Reel and Cut Tape & Digi-Reel packaging?

A: Tape & Reel (TR) format supplies components on continuous carrier tape wound on reels, suitable for high-volume automated assembly. Cut Tape (CT) & Digi-Reel format provides components on cut tape segments or alternative reel formats, often used for lower-volume orders or specific assembly equipment compatibility. Both formats contain identical components.

Q: Can I mix TZMB39-GS18 and TZMB39-GS08 parts in the same production batch?

A: Yes. Since both parts are electrically and mechanically equivalent, they can be used interchangeably within the same circuit design and production run without affecting circuit performance or reliability.

Q: Are there any compliance or certification differences?

A: No. Both parts carry identical compliance certifications: RoHS3 compliant, REACH unaffected, EAR99 classification, and AEC-Q101 automotive qualification. MSL rating is 1 (Unlimited) for both.

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