TZM5246B-GS18 Equivalent & Substitute Parts

Part Overview

The TZM5246B-GS18 is a Zener diode rated at 16 V nominal voltage with 500 mW power dissipation, packaged in SOD-80 MiniMELF surface mount configuration. Manufactured by Vishay General Semiconductor - Diodes Division, this component is classified as Active product status. Substitute parts are identified when original inventory becomes unavailable, when alternative packaging formats are required, or when design specifications permit operation within the electrical parameter tolerances of equivalent devices.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	16	V
Tolerance	±5%	%
Power - Max	500	mW
Impedance (Max)	17	Ohms
Current - Reverse Leakage @ Vr	100	nA @ 12 V
Voltage - Forward (Vf) (Max) @ If	1.1	V @ 200 mA
Operating Temperature	175	°C
Mounting Type	Surface Mount	-
Package / Case	DO-213AC, MINI-MELF, SOD-80	-
RoHS Status	ROHS3 Compliant	-
Moisture Sensitivity Level	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitution of the TZM5246B-GS18 is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Zener voltage rating: 16 V nominal (±5% tolerance permits 15.2 V to 16.8 V operating range)
Power dissipation: 500 mW maximum
Package type: SOD-80 MiniMELF surface mount configuration
Reverse leakage current: 100 nA @ 12 V
Forward voltage: 1.1 V @ 200 mA
Operating temperature: 175°C maximum

Substitution Categories:

Direct Manufacturer Equivalent (TZMC16-GS08): Identical electrical specifications with automotive-grade qualification and AEC-Q101 certification. Impedance specification differs (40 Ohms vs. 17 Ohms) and forward voltage specification differs (1.5 V vs. 1.1 V @ 200 mA), indicating different internal design characteristics while maintaining functional equivalence for standard zener regulation applications.

Parametric Equivalent (TZM5246B-GS08): Identical part from same manufacturer base product line with matching electrical parameters. Packaging format differs (GS08 vs. GS18 tape reel configuration), affecting only supply chain and handling characteristics, not functional performance.

MFR Recommended Substitute (CDLL965B): Alternative manufacturer (Microchip Technology) with 15 V nominal zener voltage, representing a 1 V deviation within the ±5% tolerance band of the original 16 V specification. Package format differs (DO-213AB MELF vs. SOD-80 MiniMELF). RoHS compliance status differs (non-compliant vs. ROHS3 compliant). Operating temperature range differs (-65°C to 175°C vs. 175°C maximum).

Parameter Comparison

Parameter	TZM5246B-GS18 (Main)	TZMC16-GS08 (Direct Equivalent)	TZM5246B-GS08 (Parametric Equivalent)	CDLL965B (MFR Recommended)
Manufacturer	Vishay General Semiconductor	Vishay General Semiconductor	Vishay General Semiconductor	Microchip Technology
Voltage - Zener (Nom)	16 V	16 V	16 V	15 V
Tolerance	±5%	±5%	±5%	±5%
Power - Max	500 mW	500 mW	500 mW	500 mW
Impedance (Max)	17 Ohms	40 Ohms	17 Ohms	16 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 12 V	100 nA @ 12 V	100 nA @ 12 V	500 nA @ 11 V
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 200 mA	1.5 V @ 200 mA	1.1 V @ 200 mA	1.1 V @ 200 mA
Operating Temperature	175°C	175°C	175°C	-65°C to 175°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	DO-213AC, MINI-MELF, SOD-80	DO-213AC, MINI-MELF, SOD-80	DO-213AC, MINI-MELF, SOD-80	DO-213AB, MELF
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Non-Compliant
Qualification	-	AEC-Q101	-	-
Product Status	Active	Active	Active	Active

Engineering Selection Recommendations

TZM5246B-GS08 (Parametric Equivalent): This substitute provides identical electrical performance and maintains ROHS3 compliance. The only difference is the tape reel configuration (GS08 vs. GS18), which affects packaging and supply chain logistics but not functional characteristics. This part is recommended as the primary substitute when the original TZM5246B-GS18 is unavailable.

TZMC16-GS08 (Direct Manufacturer Equivalent): This Vishay part maintains 16 V nominal zener voltage and 500 mW power rating with identical package format (SOD-80 MiniMELF). The automotive-grade designation and AEC-Q101 qualification indicate this part meets automotive reliability standards. Impedance specification of 40 Ohms and forward voltage of 1.5 V @ 200 mA differ from the main part but remain within functional equivalence for standard voltage regulation circuits. ROHS3 compliance is maintained. This part is suitable for applications requiring automotive-grade components.

CDLL965B (MFR Recommended Substitute): This Microchip Technology part operates at 15 V nominal zener voltage, representing a 1 V reduction from the 16 V specification. Within the ±5% tolerance band of the original part (15.2 V to 16.8 V), the 15 V rating falls at the lower tolerance limit. The DO-213AB MELF package differs from SOD-80 MiniMELF, requiring PCB layout modification. RoHS non-compliance status differs from the original ROHS3 compliant specification. Operating temperature range extends to -65°C, providing broader temperature coverage. This part is suitable only when voltage tolerance and package format changes are acceptable to the design.

Frequently Asked Questions (FAQ)

Q: Can TZMC16-GS08 be used as a direct replacement for TZM5246B-GS18?

A: TZMC16-GS08 is functionally equivalent for zener regulation applications. Both parts maintain 16 V nominal voltage, 500 mW power rating, and SOD-80 MiniMELF packaging. The impedance specification differs (40 Ohms vs. 17 Ohms) and forward voltage differs (1.5 V vs. 1.1 V @ 200 mA), reflecting different internal design. For circuits where impedance and forward voltage characteristics are not critical design parameters, this substitution is valid. Automotive-grade qualification of TZMC16-GS08 provides additional reliability assurance.

Q: What is the difference between TZM5246B-GS08 and TZM5246B-GS18?

A: These parts are electrically identical. The suffix designations (GS08 vs. GS18) indicate different tape reel packaging configurations used for automated assembly. GS08 and GS18 refer to different tape specifications and reel sizes. Selection between these variants depends on assembly equipment compatibility and supply chain availability, not electrical performance.

Q: Is CDLL965B a suitable substitute for TZM5246B-GS18?

A: CDLL965B operates at 15 V nominal zener voltage compared to 16 V for the original part. This 1 V difference places the CDLL965B at the lower tolerance boundary of the original ±5% specification. The package format differs (DO-213AB MELF vs. SOD-80 MiniMELF), requiring PCB redesign. RoHS compliance status differs (non-compliant vs. ROHS3 compliant). This substitution is valid only when circuit design permits 15 V operation and package format change is acceptable.

Q: What are the key electrical parameters that determine substitution compatibility?

A: Zener voltage rating, power dissipation maximum, reverse leakage current, forward voltage characteristics, and impedance specifications determine functional equivalence. For the TZM5246B-GS18, the critical parameters are 16 V nominal voltage, 500 mW power rating, 100 nA reverse leakage @ 12 V, and 1.1 V forward voltage @ 200 mA. Substitutes must maintain these specifications within the stated tolerances to ensure circuit performance.

Q: Does package format affect electrical performance?

A: Package format (SOD-80 MiniMELF vs. DO-213AB MELF) affects physical dimensions, PCB footprint, and thermal characteristics but not the core electrical specifications of the zener diode. However, thermal performance may differ due to package geometry variations. Selection of package format depends on PCB layout constraints and thermal management requirements of the application.

Q: What compliance differences exist between the substitute parts?

A: TZM5246B-GS18, TZMC16-GS08, and TZM5246B-GS08 are all ROHS3 compliant. CDLL965B is RoHS non-compliant. TZMC16-GS08 carries AEC-Q101 automotive qualification, indicating compliance with automotive reliability standards. The other parts do not list automotive qualification. Selection based on compliance requirements depends on application regulatory and quality standards.

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