MMSZ5233B Equivalent & Substitute Parts

Part Overview

The MMSZ5233B is a 6 V, 500 mW Zener diode in SOD-123 surface mount package manufactured by onsemi. This component is classified as obsolete, indicating that direct procurement of the original part number may face availability constraints. Equivalent and substitute parts are necessary to maintain design continuity and ensure reliable component sourcing for production and repair applications.

Key Parameters

Parameter	Value
Voltage - Zener (Nom)	6 V
Tolerance	±5%
Power - Max	500 mW
Impedance (Max)	7 Ohms
Current - Reverse Leakage @ Vr	5 µA @ 3.5 V
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA
Operating Temperature	-55°C ~ 150°C
Mounting Type	Surface Mount
Package / Case	SOD-123
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the MMSZ5233B is determined by electrical and mechanical parameter alignment. The critical parameters for substitution are:

Electrical Parameters:

Zener voltage: 6 V nominal
Tolerance: ±5%
Maximum power dissipation: 500 mW
Maximum impedance: 7 Ohms
Reverse leakage current: 5 µA @ 3.5 V
Forward voltage: 900 mV @ 10 mA

Mechanical Parameters:

Package type: SOD-123 or SOD-123F
Mounting type: Surface Mount
Moisture sensitivity: MSL 1 (Unlimited)

Compliance Parameters:

RoHS Status: ROHS3 Compliant
REACH Status: REACH Unaffected

Substitute parts are grouped into three categories:

Direct Manufacturer Equivalents: Parts from onsemi with identical electrical specifications and active product status.

Parametric Equivalents: Parts with identical electrical parameters but different product grades (standard or automotive-qualified) or from alternative manufacturers.

Similar Parts: Components with minor deviations in electrical parameters (voltage tolerance, power rating, or impedance) that remain functionally compatible within design margins.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Vf @ If (mV @ mA)	Temp Range (°C)	Package	Status	RoHS
MMSZ5233B	onsemi	6	±5%	500	7	900 @ 10	-55 ~ 150	SOD-123	Obsolete	N/A
MMSZ5233BT1G	onsemi	6	±5%	500	7	900 @ 10	-55 ~ 150	SOD-123	Active	ROHS3
SZMMSZ5233BT1G	onsemi	6	±5%	500	7	900 @ 10	-55 ~ 150	SOD-123	Active	ROHS3
MMSZ5233B-7-F	Diodes Incorporated	6	±5%	500	7	900 @ 10	-65 ~ 150	SOD-123	Active	ROHS3
BZT52H-C6V2,115	Nexperia USA Inc.	6.2	±5%	375	10	900 @ 10	-65 ~ 150	SOD-123F	Active	ROHS3
CMHZ5233B TR PBFREE	Central Semiconductor Corp	6	±5%	500	7	900 @ 10	-65 ~ 150	SOD-123	Active	ROHS3
MMSZ5233B_R1_00001	Panjit International Inc.	6	±5%	500	7	N/A	-55 ~ 150	SOD-123	Active	ROHS3
MMSZ5233C-TP	Micro Commercial Co	6	±2%	500	7	900 @ 10	-55 ~ 150	SOD-123	Active	N/A
MMSZ5233B-E3-08	Vishay General Semiconductor	6	±5%	500	7	N/A	-55 ~ 150	SOD-123	Active	ROHS3
MMSZ5233B-E3-18	Vishay General Semiconductor	6	±5%	500	7	N/A	-55 ~ 150	SOD-123	Active	ROHS3
MMSZ5233B-G3-08	Vishay General Semiconductor	6	±5%	500	7	N/A	-55 ~ 150	SOD-123	Active	ROHS3

Engineering Selection Recommendations

Primary Recommendation: MMSZ5233BT1G (onsemi)

The MMSZ5233BT1G is the direct active equivalent from the original manufacturer onsemi. This part maintains identical electrical specifications to the obsolete MMSZ5233B and carries active product status with ROHS3 compliance. The part is available in Tape & Reel packaging with 47,100 units in stock, ensuring reliable supply chain continuity.

Secondary Recommendation: SZMMSZ5233BT1G (onsemi, Automotive-Qualified)

The SZMMSZ5233BT1G is an automotive-grade variant from onsemi with AEC-Q101 qualification. This part is electrically identical to the MMSZ5233B and carries active product status with ROHS3 compliance. Selection of this part is appropriate for applications requiring automotive-grade components or enhanced reliability assurance. 30,300 units are in stock.

Alternative Recommendation: CMHZ5233B TR PBFREE (Central Semiconductor Corp)

The CMHZ5233B TR PBFREE from Central Semiconductor Corp provides full electrical equivalence with identical 6 V, 500 mW specifications. This part extends the operating temperature range to -65°C and carries active product status with ROHS3 compliance. 9,088 units are in stock.

Extended Temperature Option: MMSZ5233B-7-F (Diodes Incorporated)

The MMSZ5233B-7-F from Diodes Incorporated maintains electrical equivalence with an extended lower operating temperature limit of -65°C. This part is active and ROHS3 compliant, with 9,100 units in stock. Selection is appropriate for applications requiring enhanced cold-temperature performance.

Precision Tolerance Option: MMSZ5233C-TP (Micro Commercial Co)

The MMSZ5233C-TP offers tighter voltage tolerance of ±2% compared to the standard ±5%, while maintaining all other electrical parameters. This part is active with identical power and impedance specifications. Selection is appropriate for applications requiring improved voltage regulation accuracy.

Vishay Alternatives: MMSZ5233B-E3-08, MMSZ5233B-E3-18, MMSZ5233B-G3-08

These Vishay General Semiconductor parts provide full electrical equivalence with active product status and ROHS3 compliance. The E3 and G3 designations indicate different manufacturing date codes or tape configurations. These parts are suitable for applications where Vishay sourcing is preferred or required.

Limited Compatibility: BZT52H-C6V2,115 (Nexperia USA Inc.)

The BZT52H-C6V2,115 from Nexperia operates at 6.2 V nominal with reduced power rating of 375 mW and increased impedance of 10 Ohms. This part is automotive-qualified (AEC-Q101) and uses SOD-123F packaging. Selection is limited to applications where the 0.2 V voltage difference and reduced power dissipation are acceptable within design margins.

Frequently Asked Questions (FAQ)

Q: Can MMSZ5233BT1G directly replace MMSZ5233B in existing designs?

A: Yes. The MMSZ5233BT1G maintains identical electrical specifications (6 V, 500 mW, ±5% tolerance, 7 Ohms impedance) and identical SOD-123 package. The primary difference is product status (active vs. obsolete) and packaging format (Tape & Reel vs. unspecified). No circuit modifications are required.

Q: What is the difference between MMSZ5233BT1G and SZMMSZ5233BT1G?

A: Both parts are electrically identical with 6 V, 500 mW specifications. The SZMMSZ5233BT1G carries automotive-grade qualification (AEC-Q101) and is designated for automotive applications. Selection depends on application requirements and qualification standards.

Q: Why does BZT52H-C6V2,115 have different electrical parameters?

A: The BZT52H-C6V2,115 operates at 6.2 V nominal (0.2 V higher) with 375 mW power rating (125 mW lower) and 10 Ohms impedance (3 Ohms higher). These differences place it in the "similar" category rather than direct equivalent. Use only if design margins accommodate these parameter variations.

Q: Are all substitute parts ROHS3 compliant?

A: Most substitute parts carry ROHS3 compliance. The MMSZ5233C-TP does not specify RoHS status in available data. Verify RoHS compliance requirements with your procurement or quality department before selection.

Q: What is the significance of the E3, G3, and other suffixes in Vishay part numbers?

A: These suffixes indicate different manufacturing date codes, tape configurations, or internal product variants. All three Vishay options (MMSZ5233B-E3-08, MMSZ5233B-E3-18, MMSZ5233B-G3-08) are electrically equivalent and functionally interchangeable. Selection can be based on availability or procurement preference.

Q: Can MMSZ5233C-TP be used where tighter voltage tolerance is required?

A: Yes. The MMSZ5233C-TP provides ±2% voltage tolerance compared to the standard ±5%. This tighter tolerance is suitable for applications requiring improved voltage regulation accuracy. All other electrical parameters remain equivalent.

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

A: SOD-123F is a variant of the SOD-123 package. The BZT52H-C6V2,115 uses SOD-123F packaging. Verify PCB footprint compatibility before substitution, as minor dimensional differences may exist between package variants.

Q: Which substitute part has the widest operating temperature range?

A: Both MMSZ5233B-7-F (Diodes Incorporated) and BZT52H-C6V2,115 (Nexperia) extend the lower temperature limit to -65°C, compared to -55°C for the original MMSZ5233B. Selection depends on application temperature requirements and other electrical parameter compatibility.

Q: Are there inventory considerations for long-term supply?

A: Yes. MMSZ5233BT1G has the highest inventory (47,100 units), followed by SZMMSZ5233BT1G (30,300 units). Parts with lower inventory (MMSZ5233B-E3-08 with 773 units, MMSZ5233B-E3-18 with 862 units) may face supply constraints for high-volume applications. Verify availability with your supplier for production requirements.

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