VLZ30D-GS08 Equivalent & Substitute Parts

Part Overview

The VLZ30D-GS08 is a Zener diode manufactured by Vishay General Semiconductor - Diodes Division, rated at 29.77 V nominal voltage with 500 mW power dissipation in SOD-80 QuadroMELF surface mount packaging. This component is classified as Obsolete, which necessitates identification of equivalent substitute parts for ongoing design support and procurement continuity. The part carries AEC-Q101 automotive qualification and ROHS3 compliance.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	29.77	V
Power - Max	500	mW
Impedance (Max)	55	Ohms
Current - Reverse Leakage @ Vr	40	µA @ 27.6 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 QuadroMELF	-
Grade	Automotive	-
Qualification	AEC-Q101	-

Substitute Part Grouping Explanation

Substitute parts for the VLZ30D-GS08 are identified based on the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Zener voltage nominal rating: 29.77 V to 30 V (±1.77% tolerance acceptable)
Power dissipation: 500 mW (exact match required)
Mounting type: Surface Mount (mandatory)
Operating temperature range: Minimum -65°C to 175°C coverage
Package compatibility: SOD-80 or equivalent MiniMELF form factors

Acceptable Parameter Variations:

Impedance (Zzt): 55 to 100 Ohms (within typical zener diode specifications)
Reverse leakage current: 10 nA to 40 µA (acceptable range for 30 V zener class)
Forward voltage: 0.9 V to 1.5 V @ specified current
Voltage tolerance: ±2% to ±5% acceptable for non-critical applications

Substitute parts must maintain electrical functionality within these defined boundaries while accommodating obsolescence of the original VLZ30D-GS08.

Parameter Comparison

Parameter	VLZ30D-GS08	TLZ30D-GS08	1N5545BUR-1	BZV55-B30,115
Manufacturer	Vishay	Vishay	Microchip	NXP
Voltage - Zener (Nom)	29.77 V	30 V	30 V	30 V
Tolerance	-	-	±5%	±2%
Power - Max	500 mW	500 mW	500 mW	500 mW
Impedance (Max)	55 Ohms	80 Ohms	100 Ohms	80 Ohms
Current - Reverse Leakage @ Vr	40 µA @ 27.6 V	40 nA @ 27.6 V	10 nA @ 27 V	50 nA @ 700 mV
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA	1.5 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 200°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	SOD-80 QuadroMELF	SOD-80 MiniMELF	DO-213AA	DO-213AC, MINI-MELF, SOD-80
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	Not specified

Engineering Selection Recommendations

Primary Substitute: TLZ30D-GS08

The TLZ30D-GS08 from Vishay is the direct equivalent substitute. Both parts share identical manufacturer lineage (Vishay General Semiconductor - Diodes Division), matching base product series (VLZ/TLZ), and equivalent electrical specifications. The TLZ30D-GS08 maintains 30 V nominal zener voltage, 500 mW power rating, and -65°C to 175°C operating range. This part is Active status with high inventory availability (90,200 pcs), ROHS3 compliance, and AEC-Q101 automotive qualification. Package form factor transitions from QuadroMELF to MiniMELF, both within SOD-80 classification. Impedance increases from 55 Ohms to 80 Ohms, and reverse leakage improves from 40 µA to 40 nA, representing enhanced performance characteristics.

Secondary Substitute: BZV55-B30,115

The BZV55-B30,115 from NXP Semiconductors provides functional equivalence with superior specifications. Zener voltage matches at 30 V with tighter ±2% tolerance. Power dissipation remains 500 mW. Operating temperature extends to 200°C (5°C above original). Impedance matches TLZ30D-GS08 at 80 Ohms. Reverse leakage is 50 nA, acceptable within zener diode specifications. Package compatibility exists in SOD-80 MiniMELF form factor. Inventory availability is substantial (244,858 pcs). This part is Active status and REACH compliant.

Tertiary Substitute: 1N5545BUR-1

The 1N5545BUR-1 from Microchip Technology offers functional substitution with trade-offs. Zener voltage is 30 V with ±5% tolerance. Power rating matches at 500 mW. Operating temperature range is -65°C to 175°C. Impedance is 100 Ohms (highest among substitutes). Reverse leakage is 10 nA (lowest). Forward voltage is reduced to 1.1 V @ 200 mA. Package is DO-213AA, differing from SOD-80 form factor. Critical limitation: RoHS non-compliant status. This part is suitable only for applications where RoHS compliance is not mandated.

Selection Criteria Summary:

Automotive/RoHS-compliant applications: Use TLZ30D-GS08 (primary) or BZV55-B30,115 (secondary)
Extended temperature requirement (>175°C): Use BZV55-B30,115
Legacy non-RoHS systems: 1N5545BUR-1 acceptable if package form factor accommodates DO-213AA

Frequently Asked Questions (FAQ)

Q1: Can TLZ30D-GS08 directly replace VLZ30D-GS08 without circuit modification?

A: Yes. Both parts maintain 30 V nominal zener voltage (within 0.77% of original 29.77 V), 500 mW power dissipation, and -65°C to 175°C operating range. Impedance increase from 55 Ohms to 80 Ohms is within acceptable zener diode parameter variation. Reverse leakage improvement (40 µA to 40 nA) enhances performance. Package transition from QuadroMELF to MiniMELF both utilize SOD-80 classification. No circuit redesign required.

Q2: What is the difference between SOD-80 QuadroMELF and SOD-80 MiniMELF packaging?

A: Both are SOD-80 surface mount packages with identical electrical performance. QuadroMELF and MiniMELF refer to physical form factor variants within the SOD-80 classification. MiniMELF represents a more compact geometry. PCB footprint compatibility depends on specific design layout. Verify footprint dimensions against PCB artwork before substitution.

Q3: Why does BZV55-B30,115 have lower reverse leakage current than VLZ30D-GS08?

A: Reverse leakage current (40 µA vs. 50 nA) reflects manufacturing process differences between Vishay and NXP semiconductor technologies. Lower leakage represents improved device characteristics and is acceptable for substitution. This does not indicate incompatibility; it indicates enhanced performance.

Q4: Is 1N5545BUR-1 suitable for automotive applications?

A: No. The 1N5545BUR-1 is RoHS non-compliant, which disqualifies it from automotive applications requiring RoHS3 compliance. Additionally, it lacks AEC-Q101 qualification. Use TLZ30D-GS08 or BZV55-B30,115 for automotive-grade requirements.

Q5: What is the significance of ±2% vs. ±5% voltage tolerance?

A: Voltage tolerance specifies the acceptable deviation from nominal zener voltage. BZV55-B30,115 (±2%) provides tighter voltage regulation than 1N5545BUR-1 (±5%). For precision voltage reference applications, ±2% tolerance is preferred. For general-purpose zener protection circuits, both tolerances are acceptable.

Q6: Can these parts be used interchangeably in existing PCB designs?

A: Package form factor compatibility must be verified. TLZ30D-GS08 and BZV55-B30,115 both use SOD-80 MiniMELF, compatible with original SOD-80 QuadroMELF footprint. The 1N5545BUR-1 uses DO-213AA package, requiring PCB footprint modification. Consult PCB layout documentation before substitution.

Q7: Which substitute offers the best long-term availability?

A: BZV55-B30,115 demonstrates highest inventory (244,858 pcs) and is manufactured by NXP, a major semiconductor supplier. TLZ30D-GS08 (90,200 pcs) is also well-stocked. Both are Active status parts with established supply chains. 1N5545BUR-1 has lower inventory (967 pcs) and RoHS non-compliance limits future availability.

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