ZMY24-GS18 Equivalent & Substitute Parts

Part Overview

The ZMY24-GS18 is an automotive-grade Zener diode rated at 24 V, 1 W, housed in a DO-213AB (MELF glass) surface mount package. Manufactured by Vishay General Semiconductor - Diodes Division, this component is qualified to AEC-Q101 automotive standards and maintains Active product status. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, supply chain considerations, or application-specific packaging preferences while maintaining identical voltage regulation characteristics and automotive qualification levels.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	24	V
Tolerance	±5	%
Power - Maximum	1	W
Package / Case	DO-213AB, MELF (Glass)	—
Mounting Type	Surface Mount	—
Operating Temperature	175	°C
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution eligibility for the ZMY24-GS18 is determined by the following critical parameters:

Mandatory Matching Criteria:

Zener voltage: 24 V nominal
Tolerance: ±5%
Power rating: 1 W maximum
Package: DO-213AB, MELF (Glass)
Mounting type: Surface Mount
Automotive grade with AEC-Q101 qualification
Operating temperature: 175°C
RoHS3 compliance

Secondary Parameters (Allowable Variation):

Impedance (Zzt): Maximum 25 Ohms
Reverse leakage current: Up to 5 µA @ specified voltage
Packaging format: Cut Tape (CT) or Digi-Reel® acceptable

The ZMY24-GS18 and ZMY24-GS08 are parametric equivalents sharing identical impedance and leakage characteristics. The ZM4749A-GS08 is a direct manufacturer substitute with higher impedance (25 Ohms vs. 14 Ohms) and elevated reverse leakage (5 µA vs. 500 nA), yet maintains full electrical and mechanical compatibility within specified tolerances.

Parameter Comparison

Parameter	ZMY24-GS18	ZMY24-GS08	ZM4749A-GS08
Voltage - Zener (Nom)	24 V	24 V	24 V
Tolerance	±5%	±5%	±5%
Power - Max	1 W	1 W	1 W
Impedance (Max)	14 Ohms	14 Ohms	25 Ohms
Current - Reverse Leakage @ Vr	500 nA @ 18 V	500 nA @ 18 V	5 µA @ 18.2 V
Operating Temperature	175°C	175°C	175°C
Grade	Automotive	Automotive	Automotive
Qualification	AEC-Q101	AEC-Q101	AEC-Q101
Package / Case	DO-213AB, MELF (Glass)	DO-213AB, MELF (Glass)	DO-213AB, MELF (Glass)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active

Engineering Selection Recommendations

ZMY24-GS08 is the primary parametric equivalent to ZMY24-GS18. Both components share identical electrical characteristics (14 Ohms impedance, 500 nA reverse leakage), automotive qualification (AEC-Q101), and RoHS3 compliance. Selection between these two is based on packaging format availability: ZMY24-GS18 is supplied in Cut Tape (CT) format with 857 pieces in stock, while ZMY24-GS08 is also supplied in Cut Tape (CT) format with 13,700 pieces in stock.

ZM4749A-GS08 is a direct manufacturer substitute with higher inventory availability (24,045 pieces) and dual packaging options (Cut Tape and Digi-Reel®). This component exhibits higher impedance (25 Ohms maximum) and elevated reverse leakage current (5 µA @ 18.2 V) compared to the primary part. Despite these parameter differences, ZM4749A-GS08 remains within acceptable substitution criteria for automotive applications, maintaining identical voltage regulation, power rating, package form factor, and AEC-Q101 qualification.

All three components are Active products with ROHS3 compliance, unlimited moisture sensitivity rating (MSL 1), and REACH unaffected status. Selection should prioritize inventory availability and packaging format requirements for the specific application.

Frequently Asked Questions (FAQ)

Q: Can ZMY24-GS08 be used as a direct replacement for ZMY24-GS18?

A: Yes. ZMY24-GS08 is a parametric equivalent with identical voltage (24 V), tolerance (±5%), power rating (1 W), impedance (14 Ohms), reverse leakage (500 nA @ 18 V), package (DO-213AB), and automotive qualification (AEC-Q101). The components differ only in packaging format and inventory levels.

Q: What are the differences between ZM4749A-GS08 and ZMY24-GS18?

A: ZM4749A-GS08 maintains identical voltage regulation (24 V ±5%), power rating (1 W), package (DO-213AB), and automotive qualification (AEC-Q101). The substitute exhibits higher impedance (25 Ohms vs. 14 Ohms) and higher reverse leakage current (5 µA @ 18.2 V vs. 500 nA @ 18 V). These parameter variations remain within acceptable substitution limits for automotive Zener diode applications.

Q: Are all three parts suitable for automotive applications?

A: Yes. ZMY24-GS18, ZMY24-GS08, and ZM4749A-GS08 are all automotive-grade components qualified to AEC-Q101 standards with 175°C operating temperature ratings.

Q: What packaging formats are available for these substitutes?

A: ZMY24-GS18 and ZMY24-GS08 are supplied in Cut Tape (CT) format. ZM4749A-GS08 is available in both Cut Tape (CT) and Digi-Reel® packaging formats.

Q: Do these components have identical RoHS and environmental compliance?

A: Yes. All three parts are ROHS3 compliant, REACH unaffected, and carry MSL 1 (Unlimited) moisture sensitivity rating.

Q: Which substitute offers the highest inventory availability?

A: ZM4749A-GS08 has the highest inventory level at 24,045 pieces in stock, compared to 13,700 pieces for ZMY24-GS08 and 857 pieces for ZMY24-GS18.

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