VLZ15C-GS08 Equivalent & Substitute Parts

Part Overview

The VLZ15C-GS08 is a Zener diode rated at 14.72 V nominal with 500 mW power dissipation in a SOD-80 QuadroMELF surface mount package, manufactured by Vishay General Semiconductor - Diodes Division. This component is classified as Obsolete, requiring identification of active equivalent parts for new designs and ongoing production support. The part carries AEC-Q101 automotive qualification and ROHS3 compliance. Substitute parts must maintain electrical performance within the specified voltage, power, and thermal operating ranges while accommodating available packaging options.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	14.72	V
Power - Max	500	mW
Impedance (Max)	16	Ohms
Current - Reverse Leakage @ Vr	40	µA @ 13.6 V
Voltage - Forward (Vf) (Max) @ If	1.5	V @ 200 mA
Operating Temperature Range	-65 to 175	°C
Mounting Type	Surface Mount
Package / Case	SOD-80 Variant
Grade	Automotive
Qualification	AEC-Q101

Substitute Part Grouping Explanation

Substitution of the VLZ15C-GS08 is determined by the following electrical and mechanical parameters:

Critical Matching Parameters:

Zener voltage nominal rating: 14.72 V (substitutes rated at 15 V fall within acceptable tolerance for this application category)
Power dissipation: 500 mW (exact match required)
Operating temperature range: -65°C to 175°C minimum (extended range acceptable)
Impedance (Zzt): 16 Ohms maximum (determines dynamic response characteristics)
Reverse leakage current: 40 µA @ 13.6 V (baseline specification)
Forward voltage: 1.5 V @ 200 mA maximum
Surface mount configuration: Required
RoHS3 compliance: Required for new production

Package Compatibility: Substitutes are available in SOD-80 MiniMELF (DO-213AC) and DO-213AA packages. These represent different physical form factors but maintain electrical equivalence within the specified parameter ranges.

Compliance Requirements: All substitute parts must maintain ROHS3 compliance and REACH unaffected status. Automotive grade and AEC-Q101 qualification are preferred but not mandatory for all substitute options.

Parameter Comparison

Parameter	VLZ15C-GS08	TLZ15C-GS08	1N4109CUR-1	1N4109UR-1	1N965BUR-1	BZV55-B15,115
Manufacturer	Vishay	Vishay	Microchip	Microchip	Microchip	Nexperia
Voltage - Zener (Nom)	14.72 V	15 V	15 V	15 V	15 V	15 V
Power - Max	500 mW	500 mW	500 mW	500 mW	500 mW	500 mW
Impedance (Max)	16 Ohms	16 Ohms	100 Ohms	100 Ohms	16 Ohms	30 Ohms
Current - Reverse Leakage @ Vr	40 µA @ 13.6 V	40 nA @ 13.6 V	50 nA @ 11.4 V	50 nA @ 11.4 V	500 nA @ 11 V	50 nA @ 10.5 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA	1.5 V @ 200 mA	1.1 V @ 200 mA	1.1 V @ 200 mA	1.1 V @ 200 mA	900 mV @ 10 mA
Operating Temperature	-65 to 175°C	-65 to 175°C	-65 to 175°C	-65 to 175°C	-65 to 175°C	-65 to 200°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	SOD-80 QuadroMELF	SOD-80 MiniMELF	DO-213AA	DO-213AA	DO-213AA (Glass)	LLDS MiniMelf
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	Not specified	ROHS3 Compliant
Tolerance	Not specified	Not specified	±2%	±5%	±5%	±2%

Engineering Selection Recommendations

Primary Substitute: TLZ15C-GS08

The TLZ15C-GS08 is the direct Vishay equivalent with Active product status. It maintains identical electrical specifications (500 mW power, 16 Ohms impedance, -65°C to 175°C operating range) and ROHS3 compliance. The nominal voltage is 15 V versus 14.72 V on the original part, representing a 1.9% variance within acceptable tolerance for zener diode applications. The package transitions from SOD-80 QuadroMELF to SOD-80 MiniMELF, requiring PCB layout verification. Reverse leakage current improves from 40 µA to 40 nA, indicating superior device quality. This part is recommended for designs where Vishay component continuity is required.

Secondary Substitutes: 1N4109CUR-1 and BZV55-B15,115

The 1N4109CUR-1 (Microchip) and BZV55-B15,115 (Nexperia) both provide 15 V, 500 mW zener diodes with ROHS3 compliance and Active status. The 1N4109CUR-1 offers ±2% tolerance and improved forward voltage (1.1 V @ 200 mA). The BZV55-B15,115 extends operating temperature to 200°C and provides ±2% tolerance. Both require package transition to DO-213AA or LLDS MiniMelf formats. Impedance values (100 Ohms and 30 Ohms respectively) differ from the original 16 Ohms specification, affecting dynamic response in high-frequency applications.

Alternative: 1N4109UR-1

The 1N4109UR-1 provides electrical equivalence but carries RoHS non-compliance status, restricting use in new production designs subject to RoHS3 requirements.

Not Recommended: 1N965BUR-1

The 1N965BUR-1 exhibits elevated reverse leakage current (500 nA @ 11 V) compared to the original specification (40 µA @ 13.6 V), indicating potential performance degradation in precision voltage regulation applications.

Frequently Asked Questions (FAQ)

Q: Can the TLZ15C-GS08 directly replace the VLZ15C-GS08 without circuit modification?

A: The TLZ15C-GS08 provides electrical equivalence within zener diode tolerance specifications. The 1.9% voltage difference (15 V versus 14.72 V) is within standard zener tolerance bands. However, the package change from SOD-80 QuadroMELF to SOD-80 MiniMELF requires PCB footprint verification. Physical dimensions differ, necessitating layout review before implementation.

Q: What is the significance of impedance differences between substitute parts?

A: Impedance (Zzt) determines the zener diode's dynamic response to load current changes. The original VLZ15C-GS08 specifies 16 Ohms maximum. Substitutes with higher impedance values (1N4109CUR-1 at 100 Ohms, BZV55-B15,115 at 30 Ohms) exhibit slower voltage regulation response. Applications requiring tight voltage stability under transient conditions should prioritize substitutes matching the original 16 Ohms specification (TLZ15C-GS08 or 1N965BUR-1).

Q: Are all substitute parts suitable for automotive applications?

A: The original VLZ15C-GS08 carries AEC-Q101 automotive qualification. Among substitutes, only the TLZ15C-GS08 maintains explicit automotive grade designation. The 1N4109CUR-1, 1N4109UR-1, 1N965BUR-1, and BZV55-B15,115 are not specified as automotive-qualified. Applications requiring AEC-Q101 compliance should use the TLZ15C-GS08 exclusively.

Q: What does the reverse leakage current specification indicate?

A: Reverse leakage current measures the diode's off-state current at specified reverse voltage. Lower values indicate superior device quality and reduced power dissipation in standby conditions. The TLZ15C-GS08 improves from 40 µA to 40 nA, representing a 1000-fold reduction. The 1N965BUR-1 at 500 nA @ 11 V shows degraded performance relative to the original specification.

Q: How does the package transition from SOD-80 QuadroMELF to DO-213AA affect circuit design?

A: SOD-80 QuadroMELF and DO-213AA represent different physical form factors with distinct footprint geometries. DO-213AA packages are smaller and more compact. PCB layout modifications are required, including pad repositioning and trace routing adjustments. Thermal management characteristics may differ due to package construction variations. Prototype validation is necessary before production implementation.

Q: Why is the 1N4109UR-1 marked as RoHS non-compliant?

A: RoHS non-compliance indicates the component contains restricted substances (lead, cadmium, mercury, or other hazardous materials) exceeding specified thresholds. This designation restricts use in applications subject to RoHS3 regulatory requirements, including consumer electronics and many industrial applications. The 1N4109UR-1 is suitable only for applications with explicit RoHS exemptions.

Q: Can forward voltage differences between substitutes affect circuit performance?

A: Forward voltage (Vf) specifications apply to forward-biased diode operation, not the zener regulation mode. In zener regulation circuits, the diode operates in reverse bias. Forward voltage becomes relevant only in applications utilizing the diode's forward-conducting characteristics. For pure voltage regulation, forward voltage differences are not critical.

Q: What inventory considerations apply to substitute selection?

A: The TLZ15C-GS08 maintains 80,400 pieces in stock, providing long-term supply security. The BZV55-B15,115 offers 4,961 pieces. The 1N4109CUR-1 and 1N4109UR-1 provide 713 and 1,139 pieces respectively. The 1N965BUR-1 maintains 691 pieces. For high-volume production, the TLZ15C-GS08 and BZV55-B15,115 offer superior availability.

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