ZM4747A-13 Equivalent & Substitute Parts

Part Overview

The ZM4747A-13 is a Zener diode rated at 20 V nominal voltage with 1 W maximum power dissipation, manufactured by Diodes Incorporated in Surface Mount MELF (DO-213AB) package. This component is classified as obsolete, indicating discontinued production and limited availability for new designs. Identification of equivalent and substitute parts is necessary to maintain supply chain continuity and support ongoing production requirements for existing applications utilizing this diode specification.

Substiute Parts

ZM4747A-13

Diodes IncorporatedIn Stock: 940ZM4747A-13 Datasheet

Current PartRFQ

SMAZ20-13-F

Diodes IncorporatedIn Stock: 25302SMAZ20-13-F Datasheet

MFR RecommendedRFQ

1N4747AUR

Microchip TechnologyIn Stock: 9801N4747AUR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ZM4747A-13 is determined by strict equivalence across the following critical electrical parameters: nominal Zener voltage (20 V), tolerance (±5%), maximum power rating (1 W), and forward voltage characteristics (1.2 V @ 200 mA). All substitute parts must maintain Surface Mount mounting type and operate within the specified temperature range of the application.

Two substitute parts meet these electrical criteria:

SMAZ20-13-F (Diodes Incorporated): Maintains identical electrical specifications with 20 V nominal voltage, ±5% tolerance, and 1 W power rating. Differs in package format (SMA/DO-214AC versus MELF/DO-213AB) and offers improved impedance performance (15 Ohms maximum versus 22 Ohms). Product status is Active with RoHS3 compliance.

1N4747AUR (Microchip Technology): Maintains identical electrical specifications with 20 V nominal voltage, ±5% tolerance, and 1 W power rating in the same MELF/DO-213AB package as the original part. Impedance and leakage characteristics are identical to the main part. Product status is Active.

Parameter Comparison

Engineering Selection Recommendations

1N4747AUR (Microchip Technology) is the primary substitute for direct replacement applications. This part maintains identical package format (DO-213AB, MELF), identical impedance specification (22 Ohms), and identical reverse leakage characteristics (5 µA @ 15.2 V). The part is in Active product status with current manufacturing availability. Operating temperature range extends to 175°C, providing adequate coverage for most applications. This substitute requires no PCB layout modifications and is electrically interchangeable.

SMAZ20-13-F (Diodes Incorporated) is suitable for applications where package format change is acceptable. This part offers superior electrical performance with lower impedance (15 Ohms) and significantly reduced reverse leakage (500 nA @ 15.2 V). The part is in Active product status with RoHS3 compliance, supporting modern regulatory requirements. Package change from MELF to SMA (DO-214AC) requires PCB layout modification. Operating temperature range is limited to 150°C, which may restrict use in high-temperature applications.

Selection between these substitutes depends on application constraints: package compatibility requirements, regulatory compliance mandates, and operating temperature specifications.

Frequently Asked Questions (FAQ)

Q: Can the SMAZ20-13-F replace the ZM4747A-13 without PCB modifications?

A: No. The SMAZ20-13-F uses SMA package (DO-214AC) while the ZM4747A-13 uses MELF package (DO-213AB). These packages have different footprints and require PCB layout changes. The 1N4747AUR maintains the same MELF package and requires no PCB modifications.

Q: What is the significance of the impedance difference between SMAZ20-13-F (15 Ohms) and ZM4747A-13 (22 Ohms)?

A: Lower impedance in the SMAZ20-13-F provides improved voltage regulation performance and faster transient response. For applications sensitive to impedance characteristics, the 1N4747AUR with matching 22 Ohms impedance is the appropriate selection.

Q: Does the reduced reverse leakage in SMAZ20-13-F (500 nA) versus ZM4747A-13 (5 µA) affect circuit performance?

A: Lower reverse leakage improves circuit performance in high-impedance applications and reduces power dissipation. The SMAZ20-13-F provides superior leakage characteristics. For applications where leakage is not a design constraint, both substitutes are functionally equivalent.

Q: Are there temperature range limitations when substituting these parts?

A: Yes. The ZM4747A-13 operates to 200°C, the 1N4747AUR to 175°C, and the SMAZ20-13-F to 150°C. Applications requiring operation above 150°C must use either the original part or the 1N4747AUR. The SMAZ20-13-F is unsuitable for high-temperature applications exceeding 150°C.

Q: What is the impact of RoHS compliance status on part selection?

A: The SMAZ20-13-F is RoHS3 compliant, supporting modern regulatory requirements for new product designs. The ZM4747A-13 and 1N4747AUR are RoHS non-compliant. For applications subject to RoHS regulations, the SMAZ20-13-F is the compliant selection, provided package format change is acceptable.

Q: Are all three parts electrically equivalent for the 20 V, 1 W specification?

A: All three parts meet the core 20 V nominal voltage, ±5% tolerance, and 1 W power rating specifications. Differences exist in impedance, reverse leakage, operating temperature range, and package format. Selection depends on specific application requirements beyond the basic voltage and power ratings.