MMSZ5244C-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The MMSZ5244C-TP is a 14 V, 500 mW surface mount zener diode manufactured by Micro Commercial Co in SOD-123 package. This component is classified as Active product status and is ROHS3 compliant. Equivalent and substitute parts are identified based on matching electrical specifications, package compatibility, and operational parameters. Alternative sources become necessary for supply chain continuity, inventory availability, or design flexibility across multiple manufacturers while maintaining functional equivalence.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	14	V
Tolerance	±2%	-
Power - Maximum	500	mW
Impedance (Maximum)	15	Ohms
Current - Reverse Leakage @ Vr	500	nA @ 10.5 V
Voltage - Forward (Maximum) @ If	900	mV @ 10 mA
Operating Temperature Range	-65 to 150	°C (TJ)
Mounting Type	Surface Mount	-
Package / Case	SOD-123	-
RoHS Status	ROHS3 Compliant	-
Moisture Sensitivity Level	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitution of the MMSZ5244C-TP is determined by the following critical parameters:

Primary Matching Criteria:

Zener voltage: 14 V nominal
Package type: SOD-123 surface mount
Power dissipation: 500 mW maximum
Operating temperature range: -65°C to 150°C minimum
Forward voltage: 900 mV @ 10 mA maximum
Impedance: 15 Ohms maximum

Tolerance Consideration: The main part specifies ±2% tolerance. Substitute parts with ±5% tolerance remain functionally equivalent for most applications where the zener voltage specification allows the wider tolerance band. The nominal 14 V zener voltage is maintained across all substitutes.

Package Compatibility: All listed substitutes utilize SOD-123 surface mount package, ensuring mechanical and electrical compatibility with existing PCB layouts and assembly processes.

Electrical Performance: All substitute parts maintain the 14 V zener voltage, 500 mW power rating, and 900 mV forward voltage specification. Reverse leakage current specifications vary but remain within acceptable ranges for zener diode operation.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Vf (Max) @ If	Temp Range	Package	Inventory
MMSZ5244C-TP	Micro Commercial Co	14 V	±2%	500 mW	15 Ω	900 mV @ 10 mA	-65 to 150°C	SOD-123	765 Pcs
CMHZ5244B TR PBFREE	Central Semiconductor Corp	14 V	±5%	500 mW	15 Ω	900 mV @ 10 mA	-65 to 150°C	SOD-123	12245 Pcs
DDZ9701T-7	Diodes Incorporated	14 V	±5%	150 mW	-	900 mV @ 10 mA	-65 to 150°C	SOD-523	1164 Pcs
MMSZ4701-E3-08	Vishay General Semiconductor - Diodes Division	14 V	±5%	500 mW	-	-	-55 to 150°C	SOD-123	15400 Pcs
MMSZ5244B-E3-08	Vishay General Semiconductor - Diodes Division	14 V	±5%	500 mW	15 Ω	-	-55 to 150°C	SOD-123	18798 Pcs
MMSZ5244ET1G	onsemi	14 V	±5%	500 mW	15 Ω	900 mV @ 10 mA	-55 to 150°C	SOD-123	6765 Pcs
SZMMSZ5244BT1G	onsemi	14 V	±5%	500 mW	15 Ω	900 mV @ 10 mA	-55 to 150°C	SOD-123	17300 Pcs
SZMMSZ5244ET1G	onsemi	14 V	±5%	500 mW	15 Ω	900 mV @ 10 mA	-55 to 150°C	SOD-123	3671 Pcs

Engineering Selection Recommendations

Full Electrical and Package Equivalents (Preferred Substitutes):

The following parts provide complete functional equivalence with the MMSZ5244C-TP:

CMHZ5244B TR PBFREE (Central Semiconductor Corp): Maintains 14 V, 500 mW, SOD-123 package with ±5% tolerance. ROHS3 compliant. Higher inventory availability (12245 Pcs).
MMSZ5244B-E3-08 (Vishay General Semiconductor - Diodes Division): Maintains 14 V, 500 mW, SOD-123 package with ±5% tolerance. ROHS3 compliant. Highest inventory availability (18798 Pcs). Operating temperature range -55 to 150°C.
MMSZ5244ET1G (onsemi): Maintains 14 V, 500 mW, SOD-123 package with ±5% tolerance. ROHS3 compliant. Series designation MMSZ52xxxT1G. Operating temperature range -55 to 150°C.
SZMMSZ5244BT1G (onsemi): Maintains 14 V, 500 mW, SOD-123 package with ±5% tolerance. ROHS3 compliant. Automotive grade with AEC-Q101 qualification. Operating temperature range -55 to 150°C.
SZMMSZ5244ET1G (onsemi): Maintains 14 V, 500 mW, SOD-123 package with ±5% tolerance. ROHS3 compliant. Automotive grade with AEC-Q101 qualification. Operating temperature range -55 to 150°C.

Partial Equivalents (Limited Substitution):

MMSZ4701-E3-08 (Vishay General Semiconductor - Diodes Division): Maintains 14 V, 500 mW, SOD-123 package with ±5% tolerance. ROHS3 compliant. Operating temperature range -55 to 150°C. Suitable where impedance specification is not critical.

Non-Equivalent Substitute (Different Package):

DDZ9701T-7 (Diodes Incorporated): Maintains 14 V zener voltage and ±5% tolerance but uses SOD-523 package instead of SOD-123. Power rating reduced to 150 mW. Not suitable for direct PCB replacement due to package incompatibility. Forward voltage specification matches at 900 mV @ 10 mA.

All substitute parts maintain ROHS3 compliance and Moisture Sensitivity Level 1 (Unlimited) classification, ensuring compatibility with standard manufacturing and storage conditions.

Frequently Asked Questions (FAQ)

Q: Can CMHZ5244B TR PBFREE be used as a direct replacement for MMSZ5244C-TP?

A: Yes. Both parts share identical zener voltage (14 V), power rating (500 mW), package (SOD-123), forward voltage (900 mV @ 10 mA), and impedance (15 Ω). The tolerance difference (±5% versus ±2%) remains within acceptable operating margins for standard zener diode applications. Both are ROHS3 compliant.

Q: What is the difference between MMSZ5244B-E3-08 and MMSZ5244ET1G?

A: Both parts maintain identical electrical specifications: 14 V zener voltage, 500 mW power, SOD-123 package, ±5% tolerance, and 900 mV forward voltage. The primary difference is manufacturer designation and series classification. MMSZ5244ET1G is designated as part of the MMSZ52xxxT1G series by onsemi. Operating temperature ranges differ slightly: MMSZ5244B-E3-08 operates -55 to 150°C, while MMSZ5244ET1G also operates -55 to 150°C.

Q: Why is DDZ9701T-7 listed as a substitute if it has a different package?

A: DDZ9701T-7 is listed because it maintains the critical electrical specification of 14 V zener voltage and is cross-referenced in the original part's substitute list. However, the SOD-523 package differs from the SOD-123 package of the main part, making it unsuitable for direct PCB replacement. The 150 mW power rating also represents a reduction from the 500 mW specification. This part is applicable only in designs where package footprint can be modified and lower power dissipation is acceptable.

Q: Are automotive-grade substitutes available?

A: Yes. SZMMSZ5244BT1G and SZMMSZ5244ET1G are both automotive-grade zener diodes with AEC-Q101 qualification. Both maintain 14 V, 500 mW, SOD-123 package specifications and ±5% tolerance. These parts are suitable for automotive applications requiring qualified components.

Q: What is the impact of ±5% tolerance substitutes on circuit design?

A: The main part specifies ±2% tolerance, while most substitutes specify ±5% tolerance. At 14 V nominal, this represents a tolerance band of ±0.28 V (±2%) for the main part versus ±0.70 V (±5%) for substitutes. Circuit designs must accommodate the wider tolerance band of substitute parts. If the application requires tighter voltage regulation, the main part or equivalent ±2% tolerance parts should be retained.

Q: Can MMSZ4701-E3-08 replace MMSZ5244C-TP in all applications?

A: MMSZ4701-E3-08 maintains the 14 V zener voltage, 500 mW power rating, and SOD-123 package. However, impedance specification is not provided for this part. If impedance characteristics are critical to circuit performance, verification against the 15 Ω maximum specification of the main part is necessary before substitution.

Q: What is the operating temperature difference between the main part and substitutes?

A: The main part MMSZ5244C-TP operates from -65°C to 150°C. Most substitute parts operate from -55°C to 150°C, representing a 10°C reduction in minimum operating temperature. For applications requiring operation below -55°C, the main part or CMHZ5244B TR PBFREE (which maintains -65°C minimum) should be selected.

Q: Are all listed substitutes ROHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant and maintain Moisture Sensitivity Level 1 (Unlimited) classification, ensuring compatibility with standard PCB assembly and storage protocols.

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