ZM4752A-13 Equivalent & Substitute Parts

Part Overview

The ZM4752A-13 is a Zener diode rated at 33 V nominal voltage with 1 W maximum power dissipation, manufactured by Diodes Incorporated in a surface mount MELF (DO-213AB) package. This component is classified as obsolete, indicating discontinuation from the original manufacturer. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for applications utilizing this zener diode specification.

Substiute Parts

ZM4752A-13

Diodes IncorporatedIn Stock: 894ZM4752A-13 Datasheet

Current PartRFQ

CLL4752A TR PBFREE

Central Semiconductor CorpIn Stock: 9226CLL4752A TR PBFREE Datasheet

DirectRFQ

1N5937BUR-1

Microchip TechnologyIn Stock: 10001N5937BUR-1 Datasheet

MFR RecommendedRFQ

CDLL3032B

Microchip TechnologyIn Stock: 1051CDLL3032B Datasheet

MFR RecommendedRFQ

CDLL5937B

Microchip TechnologyIn Stock: 1047CDLL5937B Datasheet

MFR RecommendedRFQ

CDLL5937C

Microchip TechnologyIn Stock: 1151CDLL5937C Datasheet

MFR RecommendedRFQ

CDLL5937D

Microchip TechnologyIn Stock: 904CDLL5937D Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ZM4752A-13 is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

• Zener voltage: 33 V nominal
• Tolerance: ±5% or tighter
• Power rating: 1 W minimum
• Package type: Surface mount DO-213AB / MELF
• Mounting type: Surface mount
• Forward voltage: 1.2 V @ 200 mA maximum
• Moisture sensitivity: MSL 1

Acceptable Variations:

• Power rating may exceed 1 W (1.25 W acceptable)
• Impedance may be lower than 45 Ohms (33 Ohms acceptable)
• Reverse leakage current may be lower than 5 µA
• Tolerance may be tighter than ±5% (±2% or ±1% acceptable)
• Operating temperature range may be narrower than -65°C ~ 200°C

Substitute parts must maintain the 33 V zener voltage specification and surface mount MELF package configuration to ensure mechanical and electrical compatibility with the original design.

Parameter Comparison

Engineering Selection Recommendations

CLL4752A TR PBFREE (Central Semiconductor Corp)

This substitute provides direct electrical equivalence to the ZM4752A-13 with identical zener voltage (33 V), tolerance (±5%), power rating (1 W), impedance (45 Ohms), and operating temperature range (-65°C ~ 200°C). The primary distinction is product status: CLL4752A TR PBFREE is active and carries ROHS3 compliance, whereas the original part is obsolete and RoHS non-compliant. This substitute is suitable for applications requiring RoHS compliance or long-term supply chain stability.

1N5937BUR-1 (Microchip Technology)

This substitute maintains the 33 V zener voltage and ±5% tolerance but offers enhanced power dissipation (1.25 W versus 1 W) and reduced impedance (33 Ohms versus 45 Ohms). The operating temperature range is narrower (-65°C ~ 175°C versus -65°C ~ 200°C). This part is appropriate for applications where the higher power rating provides design margin, provided the maximum operating temperature of 175°C is acceptable.

CDLL3032B (Microchip Technology)

This substitute matches the 33 V zener voltage, ±5% tolerance, and 1 W power rating. It features significantly lower reverse leakage current (500 nA versus 5 µA) and reduced impedance (45 Ohms). The operating temperature range is narrower (-55°C ~ 175°C). This part is suitable for applications sensitive to leakage current performance.

CDLL5937B (Microchip Technology)

This substitute provides 33 V zener voltage with ±5% tolerance and enhanced power rating (1.25 W). Impedance is reduced to 33 Ohms, and reverse leakage current is 1 µA. The operating temperature range is -65°C ~ 175°C. This part offers improved thermal performance compared to the original specification.

CDLL5937C (Microchip Technology)

This substitute delivers 33 V zener voltage with tighter tolerance (±2% versus ±5%), 1.25 W power rating, and 33 Ohms impedance. Reverse leakage current is 1 µA. The operating temperature range is -65°C ~ 175°C. This part is appropriate for applications requiring tighter voltage tolerance.

CDLL5937D (Microchip Technology)

This substitute provides 33 V zener voltage with the tightest tolerance available (±1%), 1.25 W power rating, and 33 Ohms impedance. Reverse leakage current is 1 µA. The operating temperature range is -65°C ~ 175°C. This part is suitable for precision applications requiring strict voltage regulation.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with higher power rating than the original ZM4752A-13?

A: Yes. Substitute parts with power ratings of 1.25 W are acceptable replacements for the 1 W original specification. Higher power rating provides additional thermal margin and does not compromise circuit functionality when the original design calls for 1 W dissipation.

Q: What is the significance of the narrower operating temperature range in some substitutes?

A: The original ZM4752A-13 operates from -65°C to 200°C. Some substitutes operate to 175°C maximum. If your application requires operation above 175°C, verify that the substitute part's temperature range is compatible with your design requirements. For most commercial and industrial applications operating below 175°C, this difference is not limiting.

Q: Why does CLL4752A TR PBFREE have ROHS3 compliance while the original does not?

A: The ZM4752A-13 is an obsolete part manufactured before RoHS3 compliance became standard. CLL4752A TR PBFREE is an active product manufactured to current RoHS3 standards. If your application or supply chain requires RoHS compliance, CLL4752A TR PBFREE is the appropriate selection.

Q: Are all substitute parts available in the same MELF package?

A: Yes. All substitute parts listed are surface mount components in the DO-213AB MELF package, ensuring mechanical compatibility with PCB layouts designed for the ZM4752A-13.

Q: What is the difference between the CDLL5937 series parts (B, C, D)?

A: The CDLL5937 series differs in voltage tolerance specification: CDLL5937B has ±5% tolerance, CDLL5937C has ±2% tolerance, and CDLL5937D has ±1% tolerance. All three share identical zener voltage (33 V), power rating (1.25 W), impedance (33 Ohms), and operating temperature range (-65°C ~ 175°C). Select based on the voltage tolerance required by your circuit design.

Q: Can I substitute the ZM4752A-13 with a part having lower reverse leakage current?

A: Yes. Lower reverse leakage current is a beneficial characteristic that does not compromise circuit function. Substitutes such as CDLL3032B (500 nA) or CDLL5937B/C/D (1 µA) provide superior leakage performance compared to the original specification (5 µA).

Q: Is impedance reduction from 45 Ohms to 33 Ohms significant?

A: Lower impedance improves voltage regulation performance and reduces output impedance at the zener operating point. This is a beneficial characteristic for most applications. Substitutes with 33 Ohms impedance provide superior regulation compared to the original 45 Ohms specification.