TZMC16-GS18 Equivalent & Substitute Parts

Part Overview

The TZMC16-GS18 is a Zener diode rated at 16 V nominal voltage with 500 mW power dissipation, manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates across the temperature range of -65°C to 175°C and is qualified to AEC-Q101 automotive standards. The part is currently active in production with RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter tolerances. The TZMC16-GS18 has two qualified substitutes that meet the core functional requirements for zener diode applications requiring 16 V regulation at 500 mW power levels.

Substiute Parts

TZMC16-GS18

Vishay General Semiconductor - Diodes DivisionIn Stock: 729837TZMC16-GS18 Datasheet

Current PartRFQ

CDLL965B

Microchip TechnologyIn Stock: 1208CDLL965B Datasheet

MFR RecommendedRFQ

CLL5246B TR PBFREE

Central Semiconductor CorpIn Stock: 3246CLL5246B TR PBFREE Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TZMC16-GS18 is determined by the following core parameters:

Primary Electrical Criteria:

• Zener voltage rating of 16 V (nominal)
• Power dissipation rating of 500 mW
• Voltage tolerance of ±5%
• Operating temperature range of -65°C to 175°C minimum

Mechanical Criteria:

• Surface mount package format (SOD-80 / DO-213AC / MINI-MELF)
• Compatible PCB footprint

Compliance Criteria:

• RoHS3 compliance status
• AEC-Q101 automotive qualification (preferred for automotive applications)

Two substitute parts meet these criteria:

1. CLL5246B TR PBFREE (Central Semiconductor Corp) — Identical 16 V zener voltage, 500 mW power rating, SOD-80 package, RoHS3 compliant, extended temperature range to 200°C, Tape & Reel packaging
2. CDLL965B (Microchip Technology) — 15 V zener voltage (1 V deviation), 500 mW power rating, DO-213AB package, RoHS non-compliant, standard temperature range

The CDLL965B substitute operates at 15 V nominal, representing a 1 V reduction from the primary specification. This substitute is applicable only in circuits where 15 V regulation is functionally acceptable or where the ±5% tolerance band permits operation at this lower voltage level.

Parameter Comparison

Engineering Selection Recommendations

CLL5246B TR PBFREE is the primary substitute for the TZMC16-GS18. This part maintains identical zener voltage (16 V), power rating (500 mW), and package format (SOD-80). Both parts are RoHS3 compliant and operate across the required temperature range. The CLL5246B TR PBFREE extends the upper operating temperature to 200°C, providing additional thermal margin. The impedance specification is lower (17 Ohms vs. 40 Ohms), resulting in improved voltage regulation characteristics. This substitute is suitable for direct replacement in applications where the primary part is unavailable.

CDLL965B is a secondary substitute applicable only in circuits where 15 V zener voltage is functionally equivalent to 16 V operation. The 1 V reduction in nominal voltage must be evaluated against circuit design margins and load regulation requirements. This part is not RoHS compliant and does not carry AEC-Q101 qualification, limiting its use in automotive or regulated environments. The DO-213AB package differs from the SOD-80 format, requiring PCB footprint verification before implementation.

For automotive applications requiring AEC-Q101 qualification, the TZMC16-GS18 remains the specified component. The CLL5246B TR PBFREE may be used as a substitute only when automotive qualification is not a design requirement.

Frequently Asked Questions (FAQ)

Q: Can the CLL5246B TR PBFREE directly replace the TZMC16-GS18 in all applications?

A: Yes, the CLL5246B TR PBFREE is electrically and mechanically compatible with the TZMC16-GS18. Both parts operate at 16 V nominal zener voltage, 500 mW power rating, and use the SOD-80 surface mount package. Both are RoHS3 compliant. The primary difference is that the CLL5246B TR PBFREE extends the operating temperature range to 200°C and has lower impedance (17 Ohms vs. 40 Ohms), which improves voltage regulation performance.

Q: Is the CDLL965B a suitable substitute for the TZMC16-GS18?

A: The CDLL965B operates at 15 V nominal voltage, which is 1 V lower than the TZMC16-GS18 specification. This substitute is applicable only in circuits where 15 V regulation is functionally acceptable or where the circuit design tolerates this voltage deviation. Additionally, the CDLL965B is not RoHS compliant and lacks AEC-Q101 automotive qualification, making it unsuitable for regulated or automotive applications.

Q: What is the difference between the SOD-80 and DO-213AB packages?

A: SOD-80 and DO-213AB are both surface mount MELF-style packages for diodes, but they have different physical dimensions and PCB footprints. The TZMC16-GS18 uses SOD-80 (also designated DO-213AC), while the CDLL965B uses DO-213AB. These packages are not interchangeable without PCB redesign. Verify footprint compatibility before selecting the CDLL965B as a substitute.

Q: Why does the CLL5246B TR PBFREE have lower impedance than the TZMC16-GS18?

A: Impedance (Zzt) is a dynamic parameter that affects voltage regulation under load changes. Lower impedance (17 Ohms vs. 40 Ohms) indicates better voltage stability and faster response to transient current changes. This is a performance advantage of the CLL5246B TR PBFREE, resulting in improved regulation characteristics in the application circuit.

Q: Are there compliance differences between the TZMC16-GS18 and its substitutes?

A: The TZMC16-GS18 and CLL5246B TR PBFREE are both RoHS3 compliant. The CDLL965B is not RoHS compliant. For applications subject to RoHS regulations or automotive standards, only the TZMC16-GS18 or CLL5246B TR PBFREE are acceptable. The TZMC16-GS18 carries AEC-Q101 automotive qualification; the CLL5246B TR PBFREE qualification status is not specified in the available data.

Q: What is the significance of the reverse leakage current specification?

A: Reverse leakage current (Ir) indicates the small current that flows through the zener diode when reverse biased below the zener voltage. The TZMC16-GS18 and CLL5246B TR PBFREE both specify 100 nA @ 12 V, while the CDLL965B specifies 500 nA @ 11 V. Lower leakage current is generally preferred for precision voltage regulation and low-power applications. The CDLL965B exhibits higher leakage, which may affect circuit performance in sensitive applications.

Q: Can the TZMC16-GS18 be used in applications requiring extended temperature operation beyond 175°C?

A: The TZMC16-GS18 is rated for operation from -65°C to 175°C. For applications requiring extended temperature operation to 200°C, the CLL5246B TR PBFREE is the appropriate substitute, as it is rated to -65°C to 200°C.