MMSZ5241B Zener Diode 11V 500mW SOD-123 Equivalent & Substitute Parts

Part Overview

The MMSZ5241B is a surface mount Zener diode manufactured by onsemi, rated for 11 V nominal Zener voltage with 500 mW maximum power dissipation in SOD-123 package. This part is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and ongoing production requirements. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives within acceptable parameter tolerances for the Zener diode category.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	11	V
Tolerance	±5%	—
Power - Max	500	mW
Impedance (Max)	22	Ohms
Current - Reverse Leakage @ Vr	2	µA @ 8.4 V
Voltage - Forward (Vf) (Max) @ If	900	mV @ 10 mA
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 MMSZ5241B is determined by the following critical parameters: nominal Zener voltage (11 V), tolerance (±5%), maximum power rating (500 mW), surface mount package type (SOD-123), and operating temperature range (-55°C to 150°C). Parts are grouped into three categories based on substitution relationship:

Direct Equivalents maintain all electrical specifications including impedance (22 Ohms) and reverse leakage current (2 µA @ 8.4 V), differing only in packaging format (Cut Tape vs. Tape & Reel) or product status (Active vs. Obsolete).

Parametric Equivalents satisfy all critical electrical parameters but may originate from different manufacturers or product lines. These parts meet or exceed the performance envelope of the original specification.

Similar Parts maintain the 11 V Zener voltage and SOD-123 package but operate at reduced power ratings (410 mW) or tighter tolerances (±2%), suitable for applications with lower power requirements or enhanced precision needs.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Ir @ Vr (µA)	Temp Range (°C)	Status	Packaging
MMSZ5241B	onsemi	11	±5%	500	22	2 @ 8.4V	-55 to 150	Obsolete	Cut Tape
MMSZ11T1G	onsemi	11	±5%	500	20	0.1 @ 8V	-55 to 150	Active	Cut Tape
MMSZ4698T1G	onsemi	11	±5%	500	—	0.05 @ 8.4V	-55 to 150	Active	Tape & Reel
MMSZ5241BT1G	onsemi	11	±5%	500	22	2 @ 8.4V	-55 to 150	Active	Tape & Reel
SZMMSZ11T1G	onsemi	11	±5%	500	20	0.1 @ 8V	-55 to 150	Active	Tape & Reel
SZMMSZ4698T1G	onsemi	11	±5%	500	—	0.05 @ 8.4V	-55 to 150	Active	Tape & Reel
SZMMSZ5241BT1G	onsemi	11	±5%	500	22	2 @ 8.4V	-55 to 150	Active	Cut Tape
MMSZ5241B-TP	Micro Commercial Co	11	±5%	500	22	2 @ 8.4V	-55 to 150	Active	Tape & Reel
MMSZ5241B-7-F	Diodes Incorporated	11	±5%	500	22	2 @ 8.4V	-65 to 150	Active	Tape & Reel
BZT52B11-G3-08	Vishay	11	±2%	410	20	0.1 @ 8.5V	-65 to 150	Active	Tape & Reel
BZT52B11-G3-18	Vishay	11	±2%	410	20	0.1 @ 8.5V	-65 to 150	Active	Tape & Reel

Engineering Selection Recommendations

Primary Recommendation: MMSZ5241BT1G (onsemi)

MMSZ5241BT1G is the direct active equivalent of MMSZ5241B, maintaining identical electrical specifications including 22 Ohm impedance and 2 µA reverse leakage current. This part is manufactured by onsemi under the MMSZ52xxxT1G series and carries Active product status with RoHS3 compliance. Tape & Reel packaging accommodates high-volume production requirements. This selection eliminates design risk through specification equivalence.

Secondary Recommendation: SZMMSZ5241BT1G (onsemi, Automotive Grade)

SZMMSZ5241BT1G provides identical electrical performance to MMSZ5241B with automotive-grade qualification (AEC-Q101). This part is suitable for applications requiring automotive reliability standards while maintaining the same 11 V, 500 mW, SOD-123 specification. Available in Cut Tape packaging with Active status.

Alternative Recommendation: MMSZ5241B-7-F (Diodes Incorporated)

MMSZ5241B-7-F from Diodes Incorporated matches all electrical parameters of the original part and extends the lower operating temperature limit to -65°C. This part is suitable for applications requiring enhanced low-temperature performance. RoHS3 compliant with Active product status.

Lower Power Alternative: BZT52B11-G3-08 or BZT52B11-G3-18 (Vishay)

These Vishay parts reduce power rating to 410 mW while maintaining 11 V Zener voltage in SOD-123 package. Tighter tolerance (±2%) and lower impedance (20 Ohms) provide enhanced precision. Suitable for applications with reduced power dissipation requirements. Extended temperature range (-65°C to 150°C) and RoHS3 compliance confirmed.

Automotive Applications: SZMMSZ11T1G or SZMMSZ4698T1G (onsemi, AEC-Q101)

For automotive-qualified designs, SZMMSZ11T1G and SZMMSZ4698T1G provide Active status with AEC-Q101 certification. Both maintain 11 V, 500 mW specifications in SOD-123 package with improved reverse leakage characteristics (100 nA and 50 nA respectively).

Frequently Asked Questions (FAQ)

Q: Can MMSZ5241BT1G directly replace MMSZ5241B in production?

A: Yes. MMSZ5241BT1G is the direct active equivalent, maintaining identical electrical specifications (11 V, ±5%, 500 mW, 22 Ohm impedance, 2 µA reverse leakage). The primary difference is packaging format (Tape & Reel vs. Cut Tape) and product status (Active vs. Obsolete). No circuit redesign is required.

Q: What is the difference between MMSZ11T1G and MMSZ4698T1G?

A: Both parts maintain 11 V, ±5%, 500 mW specifications in SOD-123 package. MMSZ4698T1G exhibits lower reverse leakage current (50 nA @ 8.4 V) compared to MMSZ11T1G (100 nA @ 8 V). MMSZ4698T1G is available in higher inventory quantities. Selection depends on leakage current requirements for the specific application.

Q: Are automotive-grade parts (SZMMSZ series) compatible with standard industrial applications?

A: Yes. Automotive-grade parts (SZMMSZ11T1G, SZMMSZ4698T1G, SZMMSZ5241BT1G) meet or exceed industrial specifications. AEC-Q101 qualification ensures enhanced reliability and process control. These parts are suitable for any application requiring the 11 V, 500 mW Zener specification, with the added benefit of automotive-level quality assurance.

Q: Can BZT52B11 series parts substitute for MMSZ5241B in all applications?

A: BZT52B11-G3-08 and BZT52B11-G3-18 maintain 11 V Zener voltage and SOD-123 package but reduce power rating to 410 mW. These parts are suitable only for applications where power dissipation does not exceed 410 mW. Tighter tolerance (±2%) and lower impedance (20 Ohms) provide enhanced precision. Verify power budget before selection.

Q: What is the significance of the temperature range difference between MMSZ5241B (-55°C to 150°C) and MMSZ5241B-7-F (-65°C to 150°C)?

A: MMSZ5241B-7-F extends the lower operating temperature limit by 10°C. This extended range is required for applications operating in extreme cold environments. For standard industrial and commercial applications within -55°C to 150°C, both parts are functionally equivalent.

Q: Does RoHS3 compliance affect substitution decisions?

A: All recommended substitute parts carry RoHS3 compliance. The original MMSZ5241B does not specify RoHS status. For applications requiring RoHS3 compliance, select from the Active equivalent parts (MMSZ5241BT1G, SZMMSZ5241BT1G, MMSZ5241B-7-F, or automotive-grade alternatives). This ensures regulatory compliance for new designs.

Q: What packaging format should be selected for high-volume production?

A: Tape & Reel (TR) packaging is standard for high-volume automated assembly. MMSZ5241BT1G, SZMMSZ11T1G, SZMMSZ4698T1G, SZMMSZ5241BT1G, MMSZ5241B-TP, and MMSZ5241B-7-F are available in Tape & Reel format. Cut Tape (CT) packaging is suitable for lower-volume or manual assembly operations.

Q: Are there inventory considerations when selecting substitute parts?

A: Inventory levels vary significantly. MMSZ5241BT1G (125,100 pcs), MMSZ4698T1G (41,300 pcs), and MMSZ5241B-7-F (32,200 pcs) offer substantial stock. SZMMSZ4698T1G (959 pcs) and BZT52B11 variants (949-1,057 pcs) have limited availability. For long-term production planning, prioritize parts with higher inventory levels or establish supply agreements with manufacturers.

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