Equivalent & Substitute Parts for VLZ33B-GS18

Part Overview

The VLZ33B-GS18 (Vishay General Semiconductor - Diodes Division) is a surface mount Zener Diode rated at 31.1 V and 500 mW, packaged in SOD-80 QuadroMELF. The part is part of the VLZ series, comes with AEC-Q101 automotive qualification, ROHS3 compliance, and features a reverse leakage of 40 µA @ 28.8 V and a max forward voltage of 1.5 V @ 200 mA. The product is currently obsolete, requiring identification of suitable alternative Zener diode models for replacement in existing designs and inventory.

Key Parameters

Parameter	VLZ33B-GS18
Manufacturer	Vishay General Semiconductor - Diodes Division
Category	Diodes, Zener
Voltage - Zener (Nom) (Vz)	31.1 V
Power - Max	500 mW
Impedance (Max) (Zzt)	65 Ohms
Current - Reverse Leakage @ Vr	40 µA @ 28.8 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA
Operating Temperature	-65°C ~ 175°C
Mounting Type	Surface Mount
Package / Case	SOD-80 Variant
Supplier Device Package	SOD-80 QuadroMELF
RoHS Status	ROHS3 Compliant
Part Status	Obsolete
Qualification	AEC-Q101
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts are grouped strictly by matching specified electrical and mechanical parameters within the Zener diode category. The parameters governing substitutability are: nominal Zener voltage (Vz), maximum power rating, maximum impedance (Zzt), reverse leakage current, forward voltage (Vf), operating temperature range, mounting type, package/case, RoHS status, qualification, and moisture sensitivity level. Only parts matching or closely aligning in these listed characteristics have been included as valid substitutes.

Parameter Comparison

Parameter	VLZ33B-GS18	TLZ33B-GS18	1N4121UR-1
Manufacturer	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division	Microchip Technology
Category	Diodes, Zener	Diodes, Zener	Diodes, Zener
Voltage - Zener (Nom) (Vz)	31.1 V	33 V	33 V
Power - Max	500 mW	500 mW	500 mW
Impedance (Max) (Zzt)	65 Ohms	65 Ohms	200 Ohms
Current - Reverse Leakage @ Vr	40 µA @ 28.8 V	40 nA @ 28.8 V	10 nA @ 25.1 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA	1.5 V @ 200 mA	1.1 V @ 200 mA
Operating Temperature	-65°C ~ 175°C	-65°C ~ 175°C	-65°C ~ 175°C (TJ)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	SOD-80 Variant	DO-213AC, MINI-MELF, SOD-80	DO-213AA
Supplier Device Package	SOD-80 QuadroMELF	SOD-80 MiniMELF	DO-213AA
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant
Part Status	Obsolete	Active	Active
Qualification	AEC-Q101	-	-
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Select substitute parts based on their electrical and mechanical parameter match to the obsolete VLZ33B-GS18. For designs requiring ROHS3 compliance, choose TLZ33B-GS18. AEC-Q101 qualification is present only in VLZ33B-GS18; substitute parts do not specify automotive qualification status. For applications not requiring RoHS compliance or specific automotive certification, 1N4121UR-1 is selectable. Consider the active status and packaging requirements relevant for surface mount replacement.

Frequently Asked Questions (FAQ)

Q1: Which substitute Zener diodes match the electrical performance of VLZ33B-GS18?
A1: TLZ33B-GS18 and 1N4121UR-1 match key electrical parameters including Zener voltage, power rating, operating temperature, and mounting type.

Q2: How does the package type impact compatibility when substituting?
A2: VLZ33B-GS18 uses SOD-80 QuadroMELF; TLZ33B-GS18 uses SOD-80 MiniMELF (DO-213AC) and 1N4121UR-1 uses DO-213AA. Mechanical fit and solder pad footprint must be verified for interchangeability.

Q3: What compliance statuses should be considered in selecting substitutes?
A3: Only TLZ33B-GS18 is ROHS3 compliant. 1N4121UR-1 is RoHS non-compliant. None of the substitutes indicate AEC-Q101 automotive qualification.

Q4: Are there differences in reverse leakage or forward voltage among substitutes?
A4: TLZ33B-GS18 and 1N4121UR-1 offer lower reverse leakage currents compared to VLZ33B-GS18. Forward voltage is lower for 1N4121UR-1.

Q5: Is moisture sensitivity a concern for any suggested parts?
A5: All listed parts indicate Moisture Sensitivity Level (MSL) of 1 (Unlimited).

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