MMSZ5237B-TP Zener Diode 8.2V 500mW SOD-123 Equivalent & Substitute Parts

Part Overview

The MMSZ5237B-TP is an 8.2 V, 500 mW surface mount zener diode manufactured by Micro Commercial Co in SOD-123 packaging. This component is classified as Active and is ROHS3 compliant with unlimited moisture sensitivity level (MSL 1). The part operates across a temperature range of -55°C to 150°C and is suitable for voltage regulation and protection applications in electronic circuits. Equivalent and substitute parts are identified based on matching electrical specifications, package compatibility, and operational parameters to ensure functional interchangeability in circuit designs.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	8.2	V
Tolerance	±5%	—
Power - Maximum	500	mW
Impedance (Maximum)	8	Ohms
Current - Reverse Leakage @ Vr	3	µA @ 6.5 V
Voltage - Forward (Maximum) @ If	900	mV @ 10 mA
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

Substitute parts are classified into two categories based on electrical and mechanical compatibility with the MMSZ5237B-TP:

Direct Substitutes maintain all critical electrical parameters: 8.2 V nominal zener voltage, 500 mW maximum power dissipation, SOD-123 package, surface mount configuration, and operating temperature range of -55°C to 150°C. These parts are functionally equivalent and can replace the main part without circuit modification.

Similar Substitutes share the 8.2 V zener voltage and SOD-123 package but differ in one or more of the following parameters: maximum power dissipation (reduced to 300–410 mW), impedance characteristics, tolerance specifications, or operating temperature range. These parts are suitable for applications where the reduced power rating or modified electrical characteristics are acceptable.

Key Parameters Determining Substitutability:

Zener voltage: 8.2 V (nominal)
Package type: SOD-123 (or compatible surface mount package)
Maximum power dissipation: 500 mW (direct) or ≥300 mW (similar)
Operating temperature: -55°C to 150°C minimum
Surface mount configuration
RoHS3 compliance

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (Nom)	Tolerance	Power Max	Zzt (Max)	Ir @ Vr	Vf (Max) @ If	Temp Range	Package	Grade
MMSZ5237B-TP	Micro Commercial Co	8.2 V	±5%	500 mW	8 Ω	3 µA @ 6.5 V	900 mV @ 10 mA	-55 to 150°C	SOD-123	Commercial
MMSZ4694T1G	onsemi	8.2 V	—	500 mW	—	1 µA @ 6.2 V	900 mV @ 10 mA	-55 to 150°C	SOD-123	Commercial
MMSZ8V2T1G	onsemi	8.2 V	±5%	500 mW	15 Ω	700 nA @ 5 V	900 mV @ 10 mA	-55 to 150°C	SOD-123	Commercial
SZMMSZ4694T1G	onsemi	8.2 V	±5%	500 mW	—	1 µA @ 6.2 V	900 mV @ 10 mA	-55 to 150°C	SOD-123	Automotive (AEC-Q101)
SZMMSZ8V2T1G	onsemi	8.2 V	±5%	500 mW	15 Ω	700 nA @ 5 V	900 mV @ 10 mA	-55 to 150°C	SOD-123	Automotive (AEC-Q101)
BZT52B8V2-E3-08	Vishay General Semiconductor	8.2 V	±2%	410 mW	7 Ω	100 nA @ 6 V	—	-55 to 150°C	SOD-123	Commercial
BZT52C8V2-E3-08	Vishay General Semiconductor	8.2 V	±5%	410 mW	7 Ω	100 nA @ 6 V	—	-55 to 150°C	SOD-123	Commercial
BZT52C8V2-G3-08	Vishay General Semiconductor	8.2 V	±5%	410 mW	7 Ω	100 nA @ 6 V	—	-55 to 150°C	SOD-123	Commercial
BZT52C8V2T-7	Diodes Incorporated	8.2 V	±6%	300 mW	15 Ω	700 nA @ 5 V	900 mV @ 10 mA	-65 to 150°C	SOD-523	Commercial
DDZ8V2B-7	Diodes Incorporated	8.2 V	±2.5%	310 mW	8 Ω	100 nA @ 6.5 V	900 mV @ 10 mA	-65 to 150°C	SOD-123	Commercial
DDZ8V2C-7	Diodes Incorporated	8.24 V	±3%	500 mW	8 Ω	100 nA @ 6.5 V	900 mV @ 10 mA	-65 to 150°C	SOD-123	Commercial

Engineering Selection Recommendations

Direct Substitutes (Preferred for Pin-Compatible Replacement):

MMSZ8V2T1G and SZMMSZ8V2T1G are the primary direct substitutes, maintaining 8.2 V nominal voltage, ±5% tolerance, 500 mW power rating, and SOD-123 package. SZMMSZ8V2T1G carries AEC-Q101 automotive qualification, making it suitable for automotive applications requiring enhanced reliability standards. Both parts are ROHS3 compliant and operate across the full -55°C to 150°C temperature range.

MMSZ4694T1G and SZMMSZ4694T1G provide equivalent electrical performance with 500 mW power dissipation and SOD-123 packaging. SZMMSZ4694T1G includes AEC-Q101 qualification for automotive use. These parts differ in impedance specification but maintain functional compatibility.

Similar Substitutes (Acceptable for Reduced Power Applications):

BZT52 series parts (BZT52B8V2-E3-08, BZT52C8V2-E3-08, BZT52C8V2-G3-08) from Vishay maintain 8.2 V zener voltage and SOD-123 package but operate at reduced 410 mW maximum power. These are suitable for circuits where power dissipation does not exceed 410 mW.

DDZ8V2B-7 and DDZ8V2C-7 from Diodes Incorporated provide 8.2 V and 8.24 V zener voltages respectively in SOD-123 package with reduced power ratings (310 mW and 500 mW). DDZ8V2C-7 matches the 500 mW specification and operates to -65°C minimum, extending the lower temperature range.

BZT52C8V2T-7 operates in SOD-523 package (smaller footprint) with 300 mW power rating and extended temperature range to -65°C. This part is suitable only if circuit board layout accommodates SOD-523 package.

All substitute parts maintain ROHS3 compliance and unlimited moisture sensitivity level (MSL 1).

Frequently Asked Questions (FAQ)

Q: Can MMSZ8V2T1G directly replace MMSZ5237B-TP without circuit modification?

A: Yes. MMSZ8V2T1G maintains identical zener voltage (8.2 V), tolerance (±5%), power rating (500 mW), and SOD-123 package. Both operate across -55°C to 150°C. Pin configuration and electrical characteristics are compatible for direct substitution.

Q: What is the difference between SZMMSZ8V2T1G and MMSZ8V2T1G?

A: SZMMSZ8V2T1G carries AEC-Q101 automotive qualification and is designated for automotive-grade applications. Electrical specifications are identical. Select SZMMSZ8V2T1G for automotive designs requiring enhanced reliability and qualification documentation.

Q: Can I use BZT52C8V2-E3-08 as a substitute if my circuit only requires 400 mW dissipation?

A: Yes. BZT52C8V2-E3-08 operates at 410 mW maximum power, which exceeds the 400 mW requirement. The 8.2 V zener voltage and SOD-123 package are compatible. However, verify that the ±5% tolerance and 7 Ω impedance are acceptable for your circuit design.

Q: Why does DDZ8V2C-7 show 8.24 V instead of 8.2 V?

A: DDZ8V2C-7 has a nominal zener voltage of 8.24 V with ±3% tolerance. This results in a voltage range of approximately 7.99 V to 8.49 V. For applications requiring strict 8.2 V regulation, verify that the 8.24 V nominal and ±3% tolerance meet circuit specifications.

Q: Is BZT52C8V2T-7 compatible with MMSZ5237B-TP?

A: BZT52C8V2T-7 uses SOD-523 package instead of SOD-123. While electrical specifications (8.2 V, ±6% tolerance) are compatible, the different package requires circuit board layout modification. Use only if SOD-523 footprint is available on the PCB.

Q: What is the advantage of selecting a part with lower impedance (Zzt)?

A: Lower impedance (measured in Ohms) indicates better voltage regulation stability and reduced output impedance variation across the operating current range. BZT52 series parts with 7 Ω impedance provide tighter voltage regulation compared to parts with 8 Ω or 15 Ω impedance. Select based on circuit regulation requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and carry unlimited moisture sensitivity level (MSL 1), matching the compliance status of MMSZ5237B-TP.

Q: Can I use DDZ8V2B-7 if my application operates below -55°C?

A: DDZ8V2B-7 operates to -65°C minimum, extending the lower temperature range by 10°C compared to MMSZ5237B-TP. This part is suitable for applications requiring operation below -55°C. However, verify that the 310 mW power rating and ±2.5% tolerance are acceptable for your circuit.

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