TZMC18-GS18 Zener Diode Equivalent & Substitute Parts

Part Overview

The TZMC18-GS18 is an 18 V, 500 mW Zener diode manufactured by Vishay General Semiconductor - Diodes Division in the SOD-80 MiniMELF surface mount package. This component is classified as an active product with automotive-grade qualification (AEC-Q101) and is RoHS3 compliant. The part is supplied in Cut Tape (CT) packaging with 5180 pieces currently in stock.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained across the specified parameter ranges. Alternative sources and packaging configurations may be required due to inventory availability, supply chain considerations, or specific application requirements.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	18	V
Power - Maximum	500	mW
Tolerance	±5%	—
Impedance (Maximum)	50	Ohms
Current - Reverse Leakage @ Vr	100	nA @ 13 V
Voltage - Forward (Maximum) @ If	1.5	V @ 200 mA
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	—

Substitute Part Grouping Explanation

Substitution logic for the TZMC18-GS18 is based on the following critical parameters:

Electrical Equivalence Criteria:

Zener voltage: 18 V nominal
Power dissipation: 500 mW maximum
Operating temperature range: -65°C to 175°C minimum
Reverse leakage current: 100 nA @ 13 V or lower
Forward voltage: 1.5 V @ 200 mA or lower

Mechanical Compatibility Criteria:

Package type: SOD-80 MiniMELF or equivalent surface mount package
Mounting type: Surface mount
Lead configuration: Compatible with automated assembly

Compliance Criteria:

RoHS3 compliance required for direct substitution
Automotive grade (AEC-Q101) preferred for applications requiring automotive qualification

Substitute parts are classified into two categories: Parametric Equivalents (identical electrical specifications with packaging variations) and Manufacturer Recommended Alternatives (functionally equivalent with minor parameter deviations).

Parameter Comparison

Parameter	TZMC18-GS18 (Main)	TZMB18-GS08	TZMB18-GS18	CDLL4112	CLL5248B TR PBFREE
Manufacturer	Vishay	Vishay	Vishay	Microchip	Central Semiconductor
Voltage - Zener (Nom)	18 V	18 V	18 V	18 V	18 V
Tolerance	±5%	±2%	±2%	±5%	±5%
Power - Max	500 mW	500 mW	500 mW	500 mW	500 mW
Impedance (Max)	50 Ohms	50 Ohms	50 Ohms	100 Ohms	21 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 13 V	100 nA @ 13 V	100 nA @ 13 V	50 nA @ 13.7 V	100 nA @ 14 V
Voltage - Forward (Max) @ If	1.5 V @ 200 mA	1.5 V @ 200 mA	1.5 V @ 200 mA	1.1 V @ 200 mA	1.25 V @ 200 mA
Operating Temperature	-65 to 175°C	-65 to 175°C	-65 to 175°C	-65 to 175°C	-65 to 200°C
Grade	Automotive	Automotive	Automotive	—	—
Qualification	AEC-Q101	AEC-Q101	AEC-Q101	—	—
Package / Case	DO-213AC, MINI-MELF, SOD-80	DO-213AC, MINI-MELF, SOD-80	DO-213AC, MINI-MELF, SOD-80	DO-213AB, MELF	DO-213AC, MINI-MELF, SOD-80
Packaging Type	Cut Tape (CT)	Tape & Reel (TR)	Tape & Reel (TR)	Bulk	Tape & Reel (TR)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Non-Compliant	ROHS3 Compliant
Inventory (Pcs)	5180	55300	26460	1048	5524

Engineering Selection Recommendations

Parametric Equivalents (Vishay TZM Series):

TZMB18-GS08 and TZMB18-GS18 are direct parametric equivalents to the TZMC18-GS18. Both parts maintain identical electrical specifications with the exception of improved tolerance (±2% versus ±5%). Both are supplied in Tape & Reel packaging rather than Cut Tape, and both retain full automotive qualification (AEC-Q101) and RoHS3 compliance. These parts are suitable for direct substitution in applications where packaging format is compatible with automated assembly processes. TZMB18-GS18 offers higher inventory availability (26460 pieces) compared to TZMB18-GS08 (55300 pieces).

Manufacturer Recommended Alternatives:

CLL5248B TR PBFREE (Central Semiconductor) maintains electrical equivalence with 18 V nominal zener voltage, 500 mW power rating, and SOD-80 package compatibility. This part is RoHS3 compliant and offers an extended operating temperature range (-65°C to 200°C). The impedance specification (21 Ohms) differs from the main part (50 Ohms), and automotive qualification is not specified. This part is suitable for non-automotive applications or where extended temperature performance is required.

CDLL4112 (Microchip Technology) is supplied in DO-213AB package (MELF variant) rather than SOD-80 MiniMELF. This part is not RoHS3 compliant and lacks automotive qualification. The impedance specification (100 Ohms) exceeds the main part specification. This part is not recommended for new designs requiring RoHS3 compliance or automotive qualification.

Frequently Asked Questions (FAQ)

Q: Can TZMB18-GS08 and TZMB18-GS18 be used interchangeably with TZMC18-GS18?

A: Yes. Both TZMB variants are parametric equivalents with identical electrical performance. The primary difference is packaging format (Tape & Reel versus Cut Tape). Both maintain the same SOD-80 MiniMELF package, automotive qualification, and RoHS3 compliance. Selection between these parts depends on assembly process requirements and inventory availability.

Q: What is the significance of the tolerance difference between TZMC18-GS18 (±5%) and TZMB18-GS08/GS18 (±2%)?

A: The TZMB variants offer tighter tolerance on the zener voltage specification. This means the actual zener voltage will remain closer to the 18 V nominal value across the production range. For applications requiring precise voltage regulation, the ±2% tolerance provides improved performance. Both tolerances are within acceptable ranges for standard zener diode applications.

Q: Is CLL5248B TR PBFREE suitable for automotive applications?

A: CLL5248B TR PBFREE is not specified with automotive qualification or AEC-Q101 certification. This part is suitable for industrial and consumer applications but is not recommended for automotive applications requiring formal qualification documentation.

Q: Why is CDLL4112 listed as a substitute if it is not RoHS3 compliant?

A: CDLL4112 is included as a manufacturer-recommended alternative for applications where RoHS3 compliance is not a requirement. The part maintains electrical equivalence (18 V, 500 mW) and surface mount compatibility. However, for new designs and applications subject to RoHS3 regulations, CDLL4112 is not suitable.

Q: What is the difference between DO-213AB and DO-213AC packages?

A: DO-213AB (MELF) and DO-213AC (MiniMELF/SOD-80) are both surface mount diode packages with different physical dimensions. DO-213AC is smaller than DO-213AB. CDLL4112 uses DO-213AB, while TZMC18-GS18 and other recommended substitutes use DO-213AC. These packages are not mechanically interchangeable on the same PCB layout.

Q: Can I substitute CLL5248B TR PBFREE for TZMC18-GS18 in a high-temperature application?

A: CLL5248B TR PBFREE offers an extended operating temperature range (-65°C to 200°C) compared to TZMC18-GS18 (-65°C to 175°C). However, this part lacks automotive qualification and RoHS3 compliance. Selection depends on whether the application requires automotive certification. For high-temperature applications with automotive requirements, TZMC18-GS18 or its Vishay equivalents are appropriate.

Q: What does AEC-Q101 qualification mean?

A: AEC-Q101 is an automotive electronics qualification standard. Parts bearing this qualification have been tested and validated for automotive applications, including requirements for reliability, temperature cycling, and environmental stress. TZMC18-GS18, TZMB18-GS08, and TZMB18-GS18 all carry this qualification. CDLL4112 and CLL5248B TR PBFREE do not.

Q: Are there inventory considerations when selecting a substitute?

A: Yes. TZMB18-GS08 has the highest inventory (55300 pieces), followed by TZMB18-GS18 (26460 pieces). TZMC18-GS18 has 5180 pieces in stock. If immediate availability is critical, TZMB18-GS08 is the preferred choice. For long-term supply chain planning, higher inventory levels provide greater assurance of continued availability.

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