MMSZ5244B Zener Diode Equivalent & Substitute Parts

Part Overview

The MMSZ5244B is a 14 V, 500 mW surface mount zener diode manufactured by onsemi in SOD-123 packaging. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and procurement needs. The MMSZ5244B serves voltage regulation and protection functions in electronic circuits requiring a 14 V zener reference with ±5% tolerance and 500 mW power dissipation capability.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	14	V
Tolerance	±5	%
Power - Max	500	mW
Impedance (Max)	15	Ohms
Current - Reverse Leakage @ Vr	100 nA @ 10 V	nA
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA	mV
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount
Package / Case	SOD-123
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the MMSZ5244B is determined by the following critical parameters: nominal zener voltage of 14 V, tolerance of ±5%, maximum power rating of 500 mW, and SOD-123 surface mount packaging. Parts are grouped into three categories based on substitution relationship:

Direct Manufacturer Equivalents maintain identical electrical specifications and packaging, differing only in product status (active vs. obsolete) or packaging format (cut tape vs. tape and reel). These parts are fully interchangeable.

Parametric Equivalents meet all core electrical requirements (14 V zener voltage, ±5% tolerance, 500 mW power, SOD-123 package) and operating temperature range. These parts include automotive-grade variants with AEC-Q101 qualification, suitable for applications requiring enhanced reliability.

Similar Parts share the same zener voltage, tolerance, and power rating but may differ in secondary parameters such as impedance, reverse leakage current specifications, or package variant (SOD-123F). These parts are functionally equivalent for most applications but require verification of specific circuit requirements.

Parameter Comparison

Part Number	Manufacturer	Product Status	Vz (Nom)	Tolerance	Power Max	Zzt (Max)	Ir @ Vr	Vf (Max) @ If	Temp Range	Package	Grade	RoHS
MMSZ5244B	onsemi	Obsolete	14 V	±5%	500 mW	15 Ω	100 nA @ 10 V	900 mV @ 10 mA	-55 to 150°C	SOD-123	Standard	N/A
MMSZ4701T1G	onsemi	Active	14 V	±5%	500 mW	N/A	50 nA @ 10.6 V	900 mV @ 10 mA	-55 to 150°C	SOD-123	Standard	ROHS3
MMSZ5244BT1G	onsemi	Active	14 V	±5%	500 mW	15 Ω	100 nA @ 10 V	900 mV @ 10 mA	-55 to 150°C	SOD-123	Standard	ROHS3
SZMMSZ4701T1G	onsemi	Active	14 V	±5%	500 mW	N/A	50 nA @ 10.6 V	900 mV @ 10 mA	-55 to 150°C	SOD-123	Automotive	ROHS3
MMSZ5244ET1G	onsemi	Active	14 V	±5%	500 mW	15 Ω	100 nA @ 10 V	900 mV @ 10 mA	-55 to 150°C	SOD-123	Standard	ROHS3
SZMMSZ5244BT1G	onsemi	Active	14 V	±5%	500 mW	15 Ω	100 nA @ 10 V	900 mV @ 10 mA	-55 to 150°C	SOD-123	Automotive	ROHS3
SZMMSZ5244ET1G	onsemi	Active	14 V	±5%	500 mW	15 Ω	100 nA @ 10 V	900 mV @ 10 mA	-55 to 150°C	SOD-123	Automotive	ROHS3
MMSZ4701-E3-08	Vishay General Semiconductor	Active	14 V	±5%	500 mW	N/A	N/A	N/A	-55 to 150°C	SOD-123	Standard	ROHS3
MMSZ5244B-TP	Micro Commercial Co	Active	14 V	±5%	500 mW	15 Ω	100 nA @ 10.5 V	N/A	-55 to 150°C	SOD-123	Standard	ROHS3
BZT52H-C15,115	Nexperia USA Inc.	Active	15 V	±5%	375 mW	15 Ω	50 nA @ 10.5 V	900 mV @ 10 mA	-65 to 150°C	SOD-123F	Automotive	ROHS3
CMHZ5244B TR PBFREE	Central Semiconductor Corp	Active	14 V	±5%	500 mW	15 Ω	100 nA @ 10 V	900 mV @ 10 mA	-65 to 150°C	SOD-123	Standard	ROHS3

Engineering Selection Recommendations

Primary Substitutes (Direct Equivalents):

MMSZ5244BT1G, MMSZ5244ET1G, and MMSZ5244B-TP are direct electrical equivalents to the obsolete MMSZ5244B. All three maintain identical zener voltage (14 V), tolerance (±5%), power rating (500 mW), impedance (15 Ω), and operating temperature range (-55 to 150°C). These parts are active products with ROHS3 compliance and are suitable for direct replacement in existing designs.

Automotive-Grade Alternatives:

SZMMSZ5244BT1G and SZMMSZ5244ET1G are automotive-qualified variants (AEC-Q101) manufactured by onsemi. These parts meet all electrical specifications of the MMSZ5244B and provide enhanced reliability for automotive and mission-critical applications. Both are active products with ROHS3 compliance.

Alternative Manufacturer Options:

CMHZ5244B TR PBFREE (Central Semiconductor Corp) provides identical electrical specifications with extended operating temperature range (-65 to 150°C). MMSZ4701-E3-08 (Vishay General Semiconductor) is an active equivalent with ROHS3 compliance, though secondary electrical parameters are not fully specified.

Limited Substitutes:

BZT52H-C15,115 (Nexperia) differs in zener voltage (15 V vs. 14 V) and power rating (375 mW vs. 500 mW). This part is suitable only for applications where a 15 V reference is acceptable and power dissipation does not exceed 375 mW. Package variant is SOD-123F rather than SOD-123.

Frequently Asked Questions (FAQ)

Q: Can MMSZ5244BT1G directly replace MMSZ5244B in existing designs?

A: Yes. MMSZ5244BT1G is an active product with identical electrical specifications: 14 V zener voltage, ±5% tolerance, 500 mW power rating, 15 Ω impedance, and SOD-123 packaging. The primary difference is product status (active vs. obsolete) and ROHS3 compliance.

Q: What is the difference between standard and automotive-grade variants?

A: Automotive-grade variants (SZMMSZ5244BT1G, SZMMSZ5244ET1G, SZMMSZ4701T1G) carry AEC-Q101 qualification and are designed for enhanced reliability in automotive applications. Electrical specifications remain identical to standard variants. Selection depends on application requirements and reliability standards.

Q: Are onsemi and Vishay parts interchangeable?

A: MMSZ4701-E3-08 (Vishay) and onsemi equivalents share the same zener voltage (14 V), tolerance (±5%), power rating (500 mW), and SOD-123 packaging. However, secondary electrical parameters for the Vishay part are not fully specified in available data. Verification against circuit requirements is necessary.

Q: Can BZT52H-C15,115 be used as a substitute?

A: BZT52H-C15,115 differs in zener voltage (15 V) and power rating (375 mW). This part is suitable only for applications where a 15 V reference voltage is acceptable and circuit power dissipation does not exceed 375 mW. Package variant is SOD-123F rather than SOD-123.

Q: What does ROHS3 compliance indicate?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements. All active substitute parts listed are ROHS3 compliant. The obsolete MMSZ5244B does not carry ROHS status designation.

Q: Are there inventory considerations for part selection?

A: Inventory levels vary across substitute parts. MMSZ5244BT1G (9,220 pcs), MMSZ5244ET1G (6,765 pcs), and SZMMSZ5244ET1G (3,671 pcs) have lower inventory compared to MMSZ4701T1G (38,282 pcs) and SZMMSZ5244BT1G (17,300 pcs). Procurement planning should account for available stock levels.

Q: What is the significance of impedance (Zzt) specification?

A: Impedance (Zzt) of 15 Ω is specified for MMSZ5244B and most direct equivalents. This parameter affects voltage regulation characteristics at different current levels. Parts without specified impedance values may have different dynamic response characteristics and should be evaluated for specific circuit applications.

Q: Does operating temperature range affect part selection?

A: MMSZ5244B and most equivalents operate from -55 to 150°C. CMHZ5244B TR PBFREE and BZT52H-C15,115 extend the lower temperature limit to -65°C. Selection depends on application temperature requirements. Extended range provides additional margin for extreme environment applications.

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