TZM5259C-GS18 Equivalent & Substitute Parts

Part Overview

The TZM5259C-GS18 is a Zener diode rated at 39 V nominal voltage with 500 mW power dissipation, packaged in SOD-80 MiniMELF surface mount configuration. This component is classified as obsolete, necessitating identification of active equivalent parts for new designs and ongoing production requirements. The part is manufactured by Vishay General Semiconductor - Diodes Division and maintains ROHS3 compliance with unlimited moisture sensitivity rating.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	39	V
Power - Max	500	mW
Impedance (Max)	80	Ohms
Current - Reverse Leakage @ Vr	100 nA @ 30 V	nA
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 200 mA	V
Package / Case	DO-213AC, MINI-MELF, SOD-80	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the TZM5259C-GS18 is determined by the following critical parameters:

Electrical Equivalence Criteria:

Zener voltage: 39 V nominal
Power rating: 500 mW maximum
Impedance: 80 Ohms maximum
Reverse leakage current: 100 nA @ 30 V
Forward voltage: 1.1 V @ 200 mA maximum

Mechanical Equivalence Criteria:

Package type: SOD-80 MiniMELF (DO-213AC)
Mounting: Surface mount

Compliance Criteria:

RoHS3 compliance required
Moisture sensitivity level: 1 (Unlimited)

The TZM5259B-GS18 qualifies as a direct substitute based on identical electrical specifications and mechanical packaging. The tolerance specification difference (±2% versus ±5%) does not preclude substitution, as the ±5% tolerance of the substitute part remains within acceptable zener voltage operating ranges for applications designed for the original component.

Parameter Comparison

Parameter	TZM5259C-GS18	TZM5259B-GS18	Unit
Manufacturer	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division	—
Category	Diodes, Zener	Diodes, Zener	—
Voltage - Zener (Nom)	39	39	V
Tolerance	±2%	±5%	—
Power - Max	500	500	mW
Impedance (Max)	80	80	Ohms
Current - Reverse Leakage @ Vr	100 nA @ 30 V	100 nA @ 30 V	nA
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 200 mA	1.1 V @ 200 mA	V
Operating Temperature	—	-65°C ~ 175°C	°C
Package / Case	DO-213AC, MINI-MELF, SOD-80	DO-213AC, MINI-MELF, SOD-80	—
Mounting Type	Surface Mount	Surface Mount	—
Product Status	Obsolete	Active	—
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	—

Engineering Selection Recommendations

The TZM5259B-GS18 is the primary substitute for the obsolete TZM5259C-GS18. Selection of this substitute is supported by the following factors:

Product Status: The TZM5259B-GS18 maintains active product status with Vishay General Semiconductor - Diodes Division, ensuring continued availability and manufacturing support. The original TZM5259C-GS18 is classified as obsolete, making transition to an active equivalent necessary for production continuity.

Compliance Alignment: Both components maintain ROHS3 compliance and identical moisture sensitivity ratings (MSL 1, Unlimited), ensuring compatibility with existing supply chain and assembly processes.

Electrical Performance: Identical zener voltage (39 V), power rating (500 mW), impedance (80 Ohms), reverse leakage current (100 nA @ 30 V), and forward voltage characteristics (1.1 V @ 200 mA) provide direct functional equivalence.

Mechanical Compatibility: Both components utilize identical SOD-80 MiniMELF packaging and surface mount configuration, requiring no PCB layout modifications or assembly process changes.

Temperature Operating Range: The TZM5259B-GS18 specifies an operating temperature range of -65°C to 175°C, providing extended low-temperature capability compared to the original component specification.

Frequently Asked Questions (FAQ)

Q: Can the TZM5259B-GS18 be used as a direct replacement for the TZM5259C-GS18 in existing designs?

A: Yes. Both components share identical electrical specifications (39 V zener voltage, 500 mW power rating, 80 Ohms impedance, 100 nA reverse leakage, 1.1 V forward voltage) and mechanical packaging (SOD-80 MiniMELF surface mount). No circuit modifications are required.

Q: What is the difference between the ±2% tolerance of the TZM5259C-GS18 and the ±5% tolerance of the TZM5259B-GS18?

A: The TZM5259C-GS18 specifies a tighter tolerance band (±2%), while the TZM5259B-GS18 allows a wider tolerance band (±5%). Both components maintain the same 39 V nominal zener voltage. Applications designed for the original component operate within the substitute's tolerance specification.

Q: Are there any packaging or assembly differences between these components?

A: No. Both components use identical SOD-80 MiniMELF packaging (DO-213AC case) and surface mount configuration. PCB footprints, reflow profiles, and assembly processes remain unchanged.

Q: What is the product status difference, and why does it matter?

A: The TZM5259C-GS18 is classified as obsolete, indicating discontinued manufacturing and limited availability. The TZM5259B-GS18 maintains active status, ensuring ongoing production, supply availability, and manufacturer support for new designs and production runs.

Q: Do both components meet the same compliance standards?

A: Yes. Both the TZM5259C-GS18 and TZM5259B-GS18 are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating. REACH status is unaffected for both components, and both carry EAR99 ECCN classification.

Q: What is the operating temperature range for the substitute part?

A: The TZM5259B-GS18 operates across -65°C to 175°C. The original TZM5259C-GS18 specifies a maximum operating temperature of 175°C without a defined minimum. The substitute provides extended low-temperature operation capability.

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