GDZ18B-E3-18 Equivalent & Substitute Parts

Part Overview

The GDZ18B-E3-18 is a Zener diode manufactured by Vishay General Semiconductor - Diodes Division, rated at 18 V nominal with 200 mW power dissipation in a surface mount SOD-323 package. This component is classified as Active product status and is ROHS3 compliant. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, manufacturing discontinuation, or application-specific requirements within the allowed parameter tolerances.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	18	V
Tolerance	±4%	—
Power - Max	200	mW
Impedance (Max)	65	Ohms
Current - Reverse Leakage @ Vr	100 nA @ 13 V	—
Operating Temperature	-55°C ~ 150°C	—
Mounting Type	Surface Mount	—
Package / Case	SC-76, SOD-323	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the GDZ18B-E3-18 is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - Zener (Nom): 18 V (exact match required)
Package / Case: SOD-323 (mechanical compatibility)
Mounting Type: Surface Mount (assembly compatibility)
Power - Max: 200 mW or greater (functional capability)
Operating Temperature Range: Must encompass or exceed -55°C ~ 150°C
RoHS Status: ROHS3 Compliant (regulatory requirement)

Parametric Equivalents are Vishay GDZ18 series parts with identical electrical specifications and packaging. These parts differ only in tape reel configuration or automotive qualification grade.

Manufacturer Recommended Substitutes are from alternative manufacturers (Central Semiconductor Corp, onsemi) with 18 V nominal rating and SOD-323 packaging. These parts may have higher power ratings (250 mW or 300 mW), different tolerance specifications (±5% or ±2%), or enhanced impedance characteristics. All maintain SOD-323 package compatibility and ROHS3 compliance.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Zener (Nom)	Tolerance	Power - Max	Impedance (Max)	Current - Reverse Leakage @ Vr	Operating Temperature	Package / Case	Grade	Qualification
GDZ18B-E3-18	Vishay	18 V	±4%	200 mW	65 Ohms	100 nA @ 13 V	-55°C ~ 150°C	SOD-323	—	—
GDZ18B-E3-08	Vishay	18 V	±4%	200 mW	65 Ohms	100 nA @ 13 V	-55°C ~ 150°C	SOD-323	—	—
GDZ18B-HE3-08	Vishay	18 V	±4%	200 mW	65 Ohms	100 nA @ 13 V	-55°C ~ 150°C	SOD-323	Automotive	AEC-Q101
GDZ18B-HE3-18	Vishay	18 V	±4%	200 mW	65 Ohms	100 nA @ 13 V	-55°C ~ 150°C	SOD-323	Automotive	AEC-Q101
CMDZ18L TR PBFREE	Central Semiconductor Corp	18 V	±5%	250 mW	200 Ohms	1 µA @ 16 V	-65°C ~ 150°C	SOD-323	—	—
CMDZ5248B TR PBFREE	Central Semiconductor Corp	18 V	±5%	250 mW	21 Ohms	100 nA @ 14 V	-65°C ~ 150°C	SOD-323	—	—
MM3Z18VST1G	onsemi	18 V	±2%	300 mW	45 Ohms	50 nA @ 12.6 V	-65°C ~ 150°C	SOD-323	—	—
SZMM3Z18VST1G	onsemi	18 V	±2%	300 mW	45 Ohms	50 nA @ 12.6 V	-65°C ~ 150°C	SOD-323	Automotive	AEC-Q101
SZMM3Z18VT1G	onsemi	18 V	±6%	300 mW	45 Ohms	50 nA @ 12.6 V	-65°C ~ 150°C	SOD-323	Automotive	AEC-Q101

Engineering Selection Recommendations

Parametric Equivalents (Vishay GDZ18 Series):

GDZ18B-E3-08 and GDZ18B-HE3-08 are direct parametric equivalents to the GDZ18B-E3-18, differing only in tape reel configuration. GDZ18B-HE3-08 and GDZ18B-HE3-18 provide automotive-grade qualification with AEC-Q101 certification, suitable for applications requiring automotive component standards while maintaining identical electrical performance.

Manufacturer Recommended Substitutes (Central Semiconductor Corp):

CMDZ18L TR PBFREE and CMDZ5248B TR PBFREE are rated for higher power dissipation (250 mW) and extended lower operating temperature (-65°C). CMDZ5248B TR PBFREE offers superior impedance characteristics (21 Ohms) compared to the primary part (65 Ohms). Both parts maintain 18 V nominal rating and SOD-323 packaging with ROHS3 compliance.

Manufacturer Recommended Substitutes (onsemi):

MM3Z18VST1G, SZMM3Z18VST1G, and SZMM3Z18VT1G are rated for 300 mW power dissipation with improved impedance (45 Ohms) and tighter voltage tolerance (±2%). SZMM3Z18VST1G and SZMM3Z18VT1G include automotive-grade qualification with AEC-Q101 certification. All onsemi parts extend operating temperature to -65°C and maintain SOD-323 packaging with ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can GDZ18B-E3-08 be used as a direct replacement for GDZ18B-E3-18?

A: Yes. Both parts are parametric equivalents with identical electrical specifications: 18 V nominal, ±4% tolerance, 200 mW power rating, 65 Ohms impedance, and -55°C ~ 150°C operating range. The difference is tape reel configuration only.

Q: What is the difference between GDZ18B-HE3-18 and GDZ18B-E3-18?

A: GDZ18B-HE3-18 includes automotive-grade qualification (AEC-Q101) while maintaining identical electrical parameters. Selection depends on application requirements for automotive component certification.

Q: Are onsemi MM3Z18VST1G and SZMM3Z18VST1G interchangeable?

A: Both parts have identical electrical specifications (18 V, ±2%, 300 mW, 45 Ohms impedance). MM3Z18VST1G is supplied in Cut Tape & Digi-Reel packaging, while SZMM3Z18VST1G is supplied in Tape & Reel. SZMM3Z18VST1G includes automotive-grade qualification. Selection depends on packaging and qualification requirements.

Q: Can I use a 250 mW or 300 mW rated substitute in place of the 200 mW GDZ18B-E3-18?

A: Yes. Higher power ratings provide additional thermal margin. CMDZ18L TR PBFREE and CMDZ5248B TR PBFREE (250 mW) and onsemi parts (300 mW) are all rated for higher power dissipation while maintaining 18 V nominal rating and SOD-323 packaging compatibility.

Q: What is the impact of tolerance differences between substitute parts?

A: The GDZ18B-E3-18 has ±4% tolerance. Central Semiconductor parts have ±5% tolerance, while onsemi parts have ±2% or ±6% tolerance depending on the specific model. Tighter tolerance (±2%) provides better voltage regulation; wider tolerance (±6%) requires circuit design accommodation.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and Moisture Sensitivity Level 1 (Unlimited), matching the primary part's regulatory status.

Q: Which substitute offers the best impedance characteristics?

A: CMDZ5248B TR PBFREE offers the lowest impedance at 21 Ohms, compared to 65 Ohms for the primary part. onsemi parts provide 45 Ohms impedance. Lower impedance reduces voltage variation under load changes.

Q: Can I use SZMM3Z18VT1G in automotive applications?

A: Yes. SZMM3Z18VT1G includes automotive-grade qualification with AEC-Q101 certification, making it suitable for automotive applications. Note the ±6% tolerance specification when evaluating circuit performance requirements.

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