MMSZ5241BT1 Equivalent & Substitute Parts

Part Overview

The MMSZ5241BT1 is a Zener diode rated at 11 V nominal with 500 mW power dissipation in a surface mount SOD-123 package. Manufactured by onsemi, this component is classified as obsolete product status. Due to its obsolete designation, identifying equivalent and substitute parts from active product lines is necessary to maintain design continuity and ensure long-term component availability for new production runs and system updates.

Key Parameters

Parameter	Value
Voltage - Zener (Nom) (Vz)	11 V
Tolerance	±5%
Power - Max	500 mW
Impedance (Max) (Zzt)	22 Ohms
Current - Reverse Leakage @ Vr	2 µA @ 8.4 V
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA
Operating Temperature	-55°C ~ 150°C
Mounting Type	Surface Mount
Package / Case	SOD-123
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the MMSZ5241BT1 is determined by the following critical parameters: nominal Zener voltage (11 V), voltage tolerance (±5%), maximum power dissipation (500 mW), impedance characteristics (22 Ohms maximum), reverse leakage current (2 µA @ 8.4 V), forward voltage drop (900 mV @ 10 mA), operating temperature range (-55°C to 150°C), and surface mount package type (SOD-123).

Substitute parts are grouped into three categories:

Direct Manufacturer Equivalents maintain identical electrical specifications and packaging from the original manufacturer onsemi, with the primary difference being active product status and improved RoHS compliance.

Parametric Equivalents provide matching electrical performance across all critical parameters but may originate from alternative manufacturers or feature minor packaging variations (such as SOD-123F) while maintaining functional compatibility.

Similar Parts satisfy the core electrical requirements (11 V Zener voltage, 500 mW power rating, SOD-123 package) but exhibit variations in secondary parameters such as impedance, reverse leakage current, or forward voltage characteristics. These parts remain functionally suitable for most applications within the specified parameter tolerances.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Ir @ Vr (µA)	Vf @ If (mV)	Temp Range (°C)	Package	Status	RoHS
MMSZ5241BT1	onsemi	11	±5%	500	22	2 @ 8.4	900 @ 10	-55 ~ 150	SOD-123	Obsolete	Non-compliant
MMSZ5241BT1G	onsemi	11	±5%	500	22	2 @ 8.4	900 @ 10	-55 ~ 150	SOD-123	Active	ROHS3 Compliant
MMSZ5241B	Taiwan Semiconductor Corporation	11	±5%	500	22	2 @ 8.4	900 @ 10	-65 ~ 150	SOD-123F	Active	ROHS3 Compliant
SZMMSZ5241BT1G	onsemi	11	±5%	500	22	2 @ 8.4	900 @ 10	-55 ~ 150	SOD-123	Active	ROHS3 Compliant
BZT52C11-7-F	Diodes Incorporated	11	±5%	500	20	0.1 @ 8	900 @ 10	-65 ~ 150	SOD-123	Active	ROHS3 Compliant
BZT52H-C11,115	Nexperia USA Inc.	11	±5%	375	10	0.1 @ 8	900 @ 10	-65 ~ 150	SOD-123F	Active	ROHS3 Compliant
MMSZ4698-TP	Micro Commercial Co	11	±5%	500	—	0.05 @ 8.4	950 @ 10	-55 ~ 150	SOD-123	Active	ROHS3 Compliant
MMSZ5241B-E3-08	Vishay General Semiconductor - Diodes Division	11	±5%	500	22	2 @ 8.4	—	-55 ~ 150	SOD-123	Active	ROHS3 Compliant
MMSZ5241B-E3-18	Vishay General Semiconductor - Diodes Division	11	±5%	500	22	2 @ 8.4	—	-55 ~ 150	SOD-123	Active	ROHS3 Compliant
MMSZ5241B-G3-08	Vishay General Semiconductor - Diodes Division	11	±5%	500	22	2 @ 8.4	—	-55 ~ 150	SOD-123	Active	ROHS3 Compliant
MMSZ5241B-G3-18	Vishay General Semiconductor - Diodes Division	11	±5%	500	22	2 @ 8.4	—	-55 ~ 150	SOD-123	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: MMSZ5241BT1G

The MMSZ5241BT1G is the direct successor to the MMSZ5241BT1. Manufactured by onsemi, this part maintains identical electrical specifications and package configuration while offering active product status and ROHS3 compliance. This part is the optimal choice for direct replacement in existing designs.

Secondary Recommendation: MMSZ5241B-E3-08 or MMSZ5241B-G3-08

These Vishay General Semiconductor parts provide parametric equivalence with identical Zener voltage, tolerance, power rating, impedance, and reverse leakage characteristics. Both parts are ROHS3 compliant and maintain active product status. The E3 and G3 designations indicate different manufacturing date codes and tape configurations.

Tertiary Recommendation: SZMMSZ5241BT1G

This onsemi part is qualified to AEC-Q101 automotive standards and carries active product status with ROHS3 compliance. It maintains all critical electrical parameters matching the original MMSZ5241BT1. This part is suitable for applications requiring automotive-grade components.

Alternative Consideration: BZT52C11-7-F

Manufactured by Diodes Incorporated, this part satisfies the core electrical requirements with 11 V Zener voltage and 500 mW power rating in SOD-123 package. The impedance is 20 Ohms (versus 22 Ohms) and reverse leakage is 100 nA @ 8 V (versus 2 µA @ 8.4 V), representing improved leakage characteristics. Operating temperature extends to -65°C. This part is ROHS3 compliant and active.

Limited Suitability: BZT52H-C11,115

This Nexperia part provides 11 V Zener voltage with ±5% tolerance but features reduced power rating (375 mW versus 500 mW) and lower impedance (10 Ohms). The package is SOD-123F rather than SOD-123. This part is suitable only for applications where the lower power dissipation is acceptable. AEC-Q101 qualification is available.

Limited Suitability: MMSZ4698-TP

This Micro Commercial Co part maintains 11 V Zener voltage, ±5% tolerance, and 500 mW power rating in SOD-123 package. Forward voltage is 950 mV @ 10 mA (versus 900 mV), representing a 50 mV increase. Reverse leakage is 50 nA @ 8.4 V, indicating superior leakage performance. This part is suitable where the forward voltage variation is acceptable.

Frequently Asked Questions (FAQ)

Q: Can MMSZ5241BT1G be used as a direct replacement for MMSZ5241BT1?

A: Yes. The MMSZ5241BT1G maintains identical electrical specifications (11 V Zener voltage, ±5% tolerance, 500 mW power, 22 Ohms impedance, 2 µA reverse leakage, 900 mV forward voltage) and package configuration (SOD-123 surface mount). The primary differences are active product status and ROHS3 compliance. This is the recommended direct replacement.

Q: What is the difference between SOD-123 and SOD-123F packages?

A: Both packages are surface mount Zener diode packages with identical electrical performance. SOD-123F features a slightly different physical form factor. Parts specified for SOD-123 can typically accommodate SOD-123F in board layouts, though PCB footprint verification is necessary. The MMSZ5241B from Taiwan Semiconductor Corporation uses SOD-123F packaging.

Q: Are the Vishay MMSZ5241B-E3 and MMSZ5241B-G3 variants interchangeable?

A: Yes. The E3 and G3 designations indicate different tape configurations and manufacturing date codes but maintain identical electrical specifications. All variants (MMSZ5241B-E3-08, MMSZ5241B-E3-18, MMSZ5241B-G3-08, MMSZ5241B-G3-18) provide 11 V Zener voltage, 500 mW power, 22 Ohms impedance, and 2 µA reverse leakage. Selection between variants depends on tape reel requirements and inventory availability.

Q: Why does BZT52C11-7-F show lower reverse leakage (100 nA) compared to MMSZ5241BT1 (2 µA)?

A: Different manufacturers employ different semiconductor processes and quality control standards. The BZT52C11-7-F from Diodes Incorporated exhibits superior reverse leakage characteristics. This represents an improvement over the original part and does not affect substitution suitability. Lower leakage current reduces standby power consumption in applications where this parameter is critical.

Q: Is BZT52H-C11,115 suitable as a substitute despite lower power rating (375 mW versus 500 mW)?

A: BZT52H-C11,115 is suitable only for applications where the actual power dissipation does not exceed 375 mW. If the circuit design requires the full 500 mW capability, this part is not appropriate. The reduced power rating represents a design constraint that must be evaluated against specific application requirements.

Q: What does ROHS3 compliance mean for component selection?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. The original MMSZ5241BT1 is RoHS non-compliant. All recommended substitutes are ROHS3 compliant, making them suitable for applications subject to environmental regulations and modern procurement standards.

Q: Can MMSZ4698-TP be used where forward voltage characteristics are critical?

A: MMSZ4698-TP exhibits 950 mV forward voltage @ 10 mA compared to 900 mV for MMSZ5241BT1. This 50 mV difference may be significant in precision circuits where forward voltage drop affects circuit performance. Evaluate the specific application's tolerance for forward voltage variation before selecting this substitute.

Q: Is SZMMSZ5241BT1G suitable for automotive applications?

A: Yes. SZMMSZ5241BT1G carries AEC-Q101 automotive qualification, making it suitable for automotive-grade applications. It maintains identical electrical specifications to MMSZ5241BT1 while offering active product status and ROHS3 compliance. This part is recommended for designs requiring automotive component qualification.

Q: What inventory considerations apply when selecting substitutes?

A: Inventory levels vary significantly across substitute options. MMSZ5241BT1G offers 125,100 pieces in stock, while MMSZ5241B-G3-08 shows only 706 pieces. For high-volume production, parts with higher inventory levels reduce supply chain risk. Consult current inventory status with component distributors for production planning.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message