MMSZ5244C-E3-18 Equivalent & Substitute Parts

Part Overview

The MMSZ5244C-E3-18 is a 14 V Zener diode rated at 500 mW in SOD-123 surface mount packaging, manufactured by Vishay General Semiconductor - Diodes Division. This component is classified as an active product with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1). The part operates across a temperature range of -55°C to 150°C with ±2% voltage tolerance and is supplied in Tape & Reel packaging format.

Equivalent and substitute parts are identified when component availability is limited, supply chain disruptions occur, or design flexibility is required while maintaining electrical and mechanical compatibility within specified parameter tolerances.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	14	V
Power - Maximum	500	mW
Tolerance	±2%	—
Impedance (Maximum)	15	Ohms
Current - Reverse Leakage @ Vr	100	nA @ 10 V
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SOD-123	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of Zener diodes is determined by alignment of the following critical parameters:

Primary Substitution Criteria:

Voltage - Zener (Nominal): Must equal 14 V
Mounting Type: Must be Surface Mount
Package / Case: Must be SOD-123 (or compatible surface mount package)
Operating Temperature Range: Must encompass or exceed -55°C to 150°C
RoHS Status: Must maintain ROHS3 compliance
Moisture Sensitivity Level: Must be MSL 1 or equivalent

Secondary Compatibility Factors:

Power - Maximum: 500 mW or greater
Tolerance: ±2% to ±5% acceptable
Impedance (Maximum): 15 to 16 Ohms acceptable
Current - Reverse Leakage: Specifications must be met at rated voltage

Substitute parts are grouped into two categories: Parametric Equivalents (identical specifications across all critical parameters) and Manufacturer Recommended Alternatives (functionally compatible with minor parameter variations within acceptable engineering tolerances).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Ir @ Vr (nA)	Temp Range (°C)	Package	Packaging Type	Inventory (Pcs)
MMSZ5244C-E3-18	Vishay	14	±2%	500	15	100 @ 10 V	-55 to 150	SOD-123	Tape & Reel	851
MMSZ5244C-E3-08	Vishay	14	±2%	500	15	100 @ 10 V	-55 to 150	SOD-123	Tape & Reel	4300
CMHZ5244B TR PBFREE	Central Semiconductor	14	±5%	500	15	100 @ 10 V	-65 to 150	SOD-123	Cut Tape & Digi-Reel	12245
DDZ14Q-7	Diodes Incorporated	14	±3%	310	16	50 @ 11 V	-65 to 150	SOD-123	Tape & Reel	1083
DDZ9701Q-7	Diodes Incorporated	14	±5%	500	—	50 @ 10.6 V	-65 to 150	SOD-123	Tape & Reel	3200
DDZ9701T-7	Diodes Incorporated	14	±5%	150	—	50 @ 10.6 V	-65 to 150	SOD-523	Tape & Reel	1164
MMSZ4701T1G	onsemi	14	±5%	500	—	50 @ 10.6 V	-55 to 150	SOD-123	Cut Tape & Digi-Reel	38282
SZMMSZ4701T1G	onsemi	14	±5%	500	—	50 @ 10.6 V	-55 to 150	SOD-123	Tape & Reel	2996
SZMMSZ5244ET1G	onsemi	14	±5%	500	15	100 @ 10 V	-55 to 150	SOD-123	Tape & Reel	3671

Engineering Selection Recommendations

Parametric Equivalent (Direct Replacement):

MMSZ5244C-E3-08 is a parametric equivalent to MMSZ5244C-E3-18. Both parts share identical electrical specifications (14 V nominal, ±2% tolerance, 500 mW, 15 Ohms impedance) and mechanical compatibility (SOD-123 package, surface mount). The primary distinction is packaging format (Tape & Reel) and inventory availability (4300 units versus 851 units). This part is suitable for direct substitution without circuit redesign.

Manufacturer Recommended Alternatives (Functional Compatibility):

CMHZ5244B TR PBFREE (Central Semiconductor) maintains 14 V nominal voltage and 500 mW power rating with SOD-123 packaging. Tolerance is ±5% versus ±2% on the primary part. Operating temperature range extends to -65°C (lower bound), providing enhanced low-temperature performance. This part is ROHS3 compliant and carries high inventory availability (12245 units).

MMSZ4701T1G and SZMMSZ4701T1G (onsemi) both deliver 14 V nominal voltage and 500 mW power in SOD-123 packaging with ±5% tolerance. SZMMSZ4701T1G includes AEC-Q101 automotive qualification. Both maintain operating temperature range of -55°C to 150°C. Inventory levels are substantial (38282 and 2996 units respectively).

SZMMSZ5244ET1G (onsemi) provides parametric alignment with 14 V, 500 mW, 15 Ohms impedance, and 100 nA reverse leakage at 10 V. This part carries AEC-Q101 automotive qualification and operates across -55°C to 150°C. Inventory availability is 3671 units.

Limited Substitution Suitability:

DDZ14Q-7 (Diodes Incorporated) operates at 14 V with ±3% tolerance but is rated at 310 mW maximum power, which is 38% below the 500 mW specification of the primary part. This part is suitable only for applications where power dissipation does not exceed 310 mW. AEC-Q101 automotive qualification is included.

DDZ9701T-7 (Diodes Incorporated) features 14 V nominal voltage but is packaged in SOD-523 (SC-79) rather than SOD-123, and power rating is limited to 150 mW. This part is not suitable for direct substitution due to package incompatibility and significantly reduced power handling.

Frequently Asked Questions (FAQ)

Q: Can MMSZ5244C-E3-08 be used as a direct replacement for MMSZ5244C-E3-18?

A: Yes. Both parts are parametric equivalents with identical electrical specifications (14 V, ±2%, 500 mW, SOD-123). The difference is packaging format and inventory level. No circuit modification is required.

Q: What is the difference between ±2% and ±5% tolerance specifications?

A: Tolerance defines the acceptable deviation from the nominal 14 V zener voltage. ±2% tolerance allows deviation of ±0.28 V (13.72 V to 14.28 V), while ±5% allows ±0.70 V (13.30 V to 14.70 V). Applications requiring tighter voltage regulation should use ±2% parts. Applications with broader voltage acceptance can use ±5% parts.

Q: Is DDZ14Q-7 suitable for all applications using MMSZ5244C-E3-18?

A: No. DDZ14Q-7 is rated at 310 mW maximum power versus 500 mW for the primary part. Substitution is limited to circuits where power dissipation does not exceed 310 mW. Verify circuit power requirements before selection.

Q: Can DDZ9701T-7 replace MMSZ5244C-E3-18?

A: No. DDZ9701T-7 uses SOD-523 packaging (SC-79) instead of SOD-123, making it mechanically incompatible with PCB layouts designed for SOD-123. Additionally, the 150 mW power rating is insufficient for 500 mW applications.

Q: What does AEC-Q101 qualification indicate?

A: AEC-Q101 is an automotive industry qualification standard for discrete semiconductors. Parts carrying this qualification (DDZ14Q-7, DDZ9701Q-7, SZMMSZ4701T1G, SZMMSZ5244ET1G) meet automotive reliability and performance requirements and are suitable for automotive applications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All parts listed in this reference maintain ROHS3 compliance, ensuring compatibility with environmental and regulatory requirements.

Q: What is the significance of MSL 1 (Unlimited) moisture sensitivity?

A: MSL 1 indicates the component has unlimited shelf life and does not require special moisture control during storage or handling. All parts in this reference carry MSL 1 rating, eliminating moisture-related handling constraints.

Q: Which substitute part has the highest inventory availability?

A: MMSZ4701T1G (onsemi) has the highest inventory at 38282 units. This part maintains 14 V nominal voltage, 500 mW power, and SOD-123 packaging with ±5% tolerance.

Q: Can I use CMHZ5244B TR PBFREE in applications requiring -55°C minimum operating temperature?

A: Yes. CMHZ5244B TR PBFREE operates from -65°C to 150°C, which exceeds the -55°C to 150°C range of the primary part. The extended low-temperature range provides additional operational margin.

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