ZMM5244B-7 Equivalent & Substitute Parts

Part Overview

The ZMM5244B-7 is a Zener diode manufactured by Diodes Incorporated, rated at 14 V nominal with 500 mW power dissipation and ±5% tolerance. The device is packaged in Mini MELF (DO-213AC, SOD-80) surface mount configuration. This part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for ongoing production and repair applications.

Key Parameters

Parameter	Value
Voltage - Zener (Nom)	14 V
Tolerance	±5%
Power - Max	500 mW
Impedance (Max)	15 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 10 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA
Operating Temperature Range	-65°C ~ 175°C
Mounting Type	Surface Mount
Package / Case	DO-213AC, MINI-MELF, SOD-80
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the ZMM5244B-7 is determined by the following critical parameters: nominal Zener voltage (14 V), power rating (500 mW), tolerance specification (±5%), impedance maximum (15 Ohms), reverse leakage current (100 nA @ 10 V), and operating temperature range (-65°C ~ 175°C). The mounting type (surface mount) and package family (DO-213 series) establish mechanical compatibility requirements.

Substitute parts are grouped into two categories:

Category 1: Exact Electrical and Package Match Parts maintaining 14 V nominal voltage, 500 mW power rating, ±5% tolerance, and compatible DO-213 package variants (DO-213AA, DO-213AB, DO-213AC, SOD-80).

Category 2: Tolerance Variance Parts with 14 V nominal voltage and 500 mW power rating but with tolerance specifications of ±10% or ±20%, suitable for applications where tighter tolerance is not required.

All substitute candidates maintain the 100 nA @ 10 V reverse leakage specification and surface mount configuration.

Parameter Comparison

Parameter	ZMM5244B-7	1N5244BUR-1	CDLL5244	CDLL5244A	CDLL5244B	CLL5244B TR PBFREE
Manufacturer	Diodes Inc.	Microchip Tech.	Microchip Tech.	Microchip Tech.	Microchip Tech.	Central Semiconductor
Voltage - Zener (Nom)	14 V	14 V	14 V	14 V	14 V	14 V
Tolerance	±5%	±5%	±20%	±10%	±5%	±5%
Power - Max	500 mW	500 mW	Not specified	Not specified	Not specified	500 mW
Impedance (Max)	15 Ohms	15 Ohms	15 Ohms	15 Ohms	15 Ohms	14 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 10 V	100 nA @ 10 V	100 nA @ 10 V	100 nA @ 10 V	100 nA @ 10 V	100 nA @ 10 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA	1.1 V @ 200 mA	1.1 V @ 200 mA	1.1 V @ 200 mA	1.1 V @ 200 mA	1.25 V @ 200 mA
Operating Temperature	-65°C ~ 175°C	-65°C ~ 175°C (TJ)	-65°C ~ 175°C	-65°C ~ 175°C	-65°C ~ 175°C	-65°C ~ 200°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	DO-213AC, MINI-MELF, SOD-80	DO-213AA	DO-213AB, MELF	DO-213AB, MELF	DO-213AB, MELF	DO-213AC, MINI-MELF, SOD-80
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	RoHS non-compliant	RoHS non-compliant	RoHS non-compliant	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: CLL5244B TR PBFREE

The CLL5244B TR PBFREE manufactured by Central Semiconductor Corp is the optimal substitute for the ZMM5244B-7. This part maintains identical electrical specifications (14 V nominal, 500 mW, ±5% tolerance) and package compatibility (DO-213AC, MINI-MELF, SOD-80). Both devices are ROHS3 compliant, ensuring regulatory alignment. The CLL5244B TR PBFREE offers an extended operating temperature range (-65°C ~ 200°C) and is currently in active production status with 2090 units in stock.

Secondary Recommendation: CDLL5244B

The CDLL5244B from Microchip Technology provides exact electrical equivalence (14 V, ±5% tolerance, 15 Ohms impedance) with active product status. This part is suitable for applications where the DO-213AB package variant is acceptable. Forward voltage specification (1.1 V @ 200 mA) is lower than the original part, which may be advantageous in low-power applications.

Alternative for Relaxed Tolerance Requirements: CDLL5244A

The CDLL5244A offers ±10% tolerance with identical 14 V nominal voltage and 15 Ohms impedance. This substitute is appropriate for applications where ±5% tolerance is not a design requirement.

Not Recommended: 1N5244BUR-1

While the 1N5244BUR-1 maintains electrical specifications, it carries RoHS non-compliant status and uses the DO-213AA package, which differs from the original Mini MELF configuration. This part is not suitable for RoHS-regulated applications.

Frequently Asked Questions (FAQ)

Q: Can the CLL5244B TR PBFREE be used as a direct replacement for the ZMM5244B-7?

A: Yes. Both devices share identical nominal Zener voltage (14 V), power rating (500 mW), tolerance (±5%), impedance (15 Ohms maximum), and reverse leakage specification (100 nA @ 10 V). Package compatibility is confirmed through DO-213AC/MINI-MELF/SOD-80 designation. Both are ROHS3 compliant.

Q: What is the difference between DO-213AA, DO-213AB, and DO-213AC packages?

A: These are variant designations within the DO-213 surface mount diode package family. DO-213AC (Mini MELF/SOD-80) matches the original ZMM5244B-7 package. DO-213AB (MELF) and DO-213AA are alternative configurations within the same family. Physical dimensions and PCB footprints differ between variants; verify PCB layout compatibility before substitution.

Q: Why do some substitute parts show lower forward voltage (1.1 V vs. 1.5 V)?

A: Forward voltage variation within the specified maximum is normal across different manufacturers and process technologies. The 1.1 V specification for Microchip and Central Semiconductor parts represents improved performance characteristics. Applications designed for the original 1.5 V specification will operate within acceptable parameters at 1.1 V.

Q: Is the extended temperature range (-65°C ~ 200°C) of the CLL5244B TR PBFREE a compatibility concern?

A: No. Extended temperature range represents enhanced capability. The original specification (-65°C ~ 175°C) is fully contained within the CLL5244B TR PBFREE range. Applications operating within the original temperature limits will function identically.

Q: Can CDLL5244 (±20% tolerance) be used in place of the ZMM5244B-7 (±5% tolerance)?

A: CDLL5244 substitution is application-dependent. The ±20% tolerance specification permits Zener voltage variation from 11.2 V to 16.8 V, compared to the original 13.3 V to 14.7 V range. Use CDLL5244 only in applications where this wider tolerance band is acceptable.

Q: What is the inventory status of substitute parts?

A: CLL5244B TR PBFREE: 2090 units in stock. CDLL5244B: 911 units. CDLL5244A: 856 units. CDLL5244: 1165 units. 1N5244BUR-1: 830 units. All substitutes are available for immediate procurement.

Q: Are there compliance differences between substitute options?

A: Yes. CLL5244B TR PBFREE and ZMM5244B-7 are both ROHS3 compliant. All Microchip Technology variants (1N5244BUR-1, CDLL5244, CDLL5244A, CDLL5244B) are RoHS non-compliant. For applications requiring RoHS compliance, CLL5244B TR PBFREE is the only suitable substitute.

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