MMSZ5256C-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The MMSZ5256C-TP is a 30 V, 500 mW Zener diode manufactured by Micro Commercial Co in a surface mount SOD-123 package. This component is classified as an interface diode and maintains Active product status. The part is specified with ±2% voltage tolerance and operates across the temperature range of -55°C to 150°C.

Equivalent and substitute parts are necessary when the primary part number becomes unavailable, when alternative packaging formats are required for manufacturing processes, or when design specifications allow for compatible alternatives from different manufacturers that meet the same electrical and mechanical requirements.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	30	V
Power - Max	500	mW
Tolerance	±2%	—
Impedance (Max)	49	Ohms
Current - Reverse Leakage @ Vr	100	nA @ 23 V
Voltage - Forward (Max) @ If	900	mV @ 10 mA
Operating Temperature	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SOD-123	—

Substitute Part Grouping Explanation

Substitution of the MMSZ5256C-TP is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - Zener (Nom): 30 V
Power - Max: 500 mW
Package / Case: SOD-123
Mounting Type: Surface Mount
Operating Temperature Range: -55°C to 150°C minimum

Secondary Compatibility Factors:

Tolerance: ±2% (exact match preferred; ±5% and ±7% acceptable with design verification)
Impedance (Max): 49 Ohms (higher impedance values indicate different device characteristics)
Current - Reverse Leakage @ Vr: 100 nA @ 23 V

Parts are classified into two substitution categories:

Direct Equivalents: Parts with identical voltage, power rating, package, and mounting type, differing only in packaging format (Bulk vs. Tape & Reel) or manufacturer designation.

Similar Alternatives: Parts with the same 30 V zener voltage and SOD-123 package but with reduced power ratings (410 mW, 310 mW, 200 mW) or different tolerance specifications. These require design-level assessment to confirm suitability for the application.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Power (mW)	Tolerance	Zzt (Ohms)	Package	Temp Range (°C)	Packaging Format
MMSZ5256C-TP	Micro Commercial Co	30	500	±2%	49	SOD-123	-55 to 150	Bulk
MMSZ5256C-E3-08	Vishay General Semiconductor	30	500	±2%	49	SOD-123	-55 to 150	Tape & Reel
MMSZ5256C-E3-18	Vishay General Semiconductor	30	500	±2%	49	SOD-123	-55 to 150	Tape & Reel
BZT52B30-E3-08	Vishay General Semiconductor	30	410	±2%	80	SOD-123	-55 to 150	Tape & Reel
BZT52C30-7-F	Diodes Incorporated	30	500	±7%	80	SOD-123	-65 to 150	Cut Tape & Digi-Reel
BZT52C30-E3-08	Vishay General Semiconductor	30	410	±5%	80	SOD-123	-55 to 150	Tape & Reel
BZT52C30S-7-F	Diodes Incorporated	30	200	±7%	80	SOD-323	-65 to 150	Tape & Reel
CMHZ5256B TR PBFREE	Central Semiconductor Corp	30	500	±5%	49	SOD-123	-65 to 150	Tape & Reel
DDZ30D-7	Diodes Incorporated	30	310	±2.5%	55	SOD-123	-65 to 150	Tape & Reel
DDZ9713S-7	Diodes Incorporated	30	200	±5%	—	SOD-323	-65 to 150	Cut Tape & Digi-Reel
MMSZ30T1G	onsemi	30	500	±5%	80	SOD-123	-55 to 150	Tape & Reel

Engineering Selection Recommendations

Direct Substitutes (Identical Electrical Specifications):

MMSZ5256C-E3-08 and MMSZ5256C-E3-18 from Vishay General Semiconductor are direct electrical equivalents to the MMSZ5256C-TP. Both maintain 30 V zener voltage, 500 mW power rating, ±2% tolerance, and 49 Ohms impedance. The primary difference is packaging format: these parts are supplied in Tape & Reel format rather than Bulk. Both are ROHS3 Compliant with Moisture Sensitivity Level 1 (Unlimited) and Active product status. These parts are suitable for direct substitution in automated assembly processes.

High-Compatibility Alternatives (500 mW, SOD-123, ±5% Tolerance):

CMHZ5256B TR PBFREE from Central Semiconductor Corp and MMSZ30T1G from onsemi both provide 30 V, 500 mW operation in SOD-123 packages. CMHZ5256B maintains the same 49 Ohms impedance as the primary part but specifies ±5% tolerance and extends the operating temperature range to -65°C. MMSZ30T1G specifies ±5% tolerance with 80 Ohms impedance and maintains the -55°C to 150°C temperature range. Both are ROHS3 Compliant with Active product status.

Reduced Power Alternatives (SOD-123, 30 V):

BZT52B30-E3-08, BZT52C30-E3-08, and DDZ30D-7 provide 30 V zener voltage in SOD-123 packages with reduced power ratings (410 mW and 310 mW respectively). These parts are suitable only when the application circuit can operate within the lower power dissipation limits. BZT52B30-E3-08 maintains ±2% tolerance; BZT52C30-E3-08 specifies ±5%; DDZ30D-7 specifies ±2.5%. All are ROHS3 Compliant with Active product status.

Reduced Power, Alternate Package (SOD-323, 30 V, 200 mW):

BZT52C30S-7-F and DDZ9713S-7 provide 30 V zener voltage with 200 mW power rating in SOD-323 (SC-76) packages. These parts are suitable only when the application permits both reduced power dissipation and the smaller SOD-323 package footprint. Both are ROHS3 Compliant with Active product status and extended temperature range to -65°C.

Tolerance Consideration:

BZT52C30-7-F from Diodes Incorporated provides 30 V, 500 mW in SOD-123 but specifies ±7% tolerance. This part is suitable only when the application circuit design permits the wider voltage tolerance specification.

Frequently Asked Questions (FAQ)

Q: Can MMSZ5256C-E3-08 replace MMSZ5256C-TP directly?

A: Yes. Both parts are electrically identical with 30 V zener voltage, 500 mW power rating, ±2% tolerance, and SOD-123 package. The difference is packaging format: MMSZ5256C-E3-08 is supplied in Tape & Reel format while MMSZ5256C-TP is supplied in Bulk. Direct substitution is valid for both manual and automated assembly processes.

Q: What is the difference between SOD-123 and SOD-323 packages?

A: SOD-123 and SOD-323 (SC-76) are different surface mount package outlines with different footprints and power dissipation characteristics. SOD-123 is larger and typically rated for higher power dissipation. Parts in SOD-323 packages (such as BZT52C30S-7-F and DDZ9713S-7) are not interchangeable with SOD-123 parts without PCB redesign.

Q: Can I use CMHZ5256B TR PBFREE instead of MMSZ5256C-TP?

A: CMHZ5256B TR PBFREE is compatible for most applications. Both provide 30 V, 500 mW in SOD-123 packages. The primary differences are: CMHZ5256B specifies ±5% tolerance (versus ±2% for MMSZ5256C-TP) and extends the operating temperature range to -65°C. Substitution is valid when the application circuit design permits ±5% voltage tolerance.

Q: Why would I choose a reduced power alternative like DDZ30D-7?

A: DDZ30D-7 provides 30 V zener voltage with 310 mW power rating in SOD-123 package. This part is suitable when the application circuit dissipates less than 310 mW and cost optimization is a design objective. The ±2.5% tolerance is tighter than many alternatives. Substitution requires confirmation that the application does not exceed 310 mW power dissipation.

Q: What does ±2% tolerance mean for zener voltage?

A: Tolerance specifies the allowable deviation of the actual zener voltage from the nominal 30 V specification. ±2% tolerance means the actual zener voltage will be between 29.4 V and 30.6 V. Tighter tolerance (±2%) provides more precise voltage regulation than wider tolerance (±5% or ±7%). Application circuits requiring precise voltage regulation should use parts with tighter tolerance specifications.

Q: Are all listed parts ROHS3 Compliant?

A: All substitute parts listed are ROHS3 Compliant. The primary part MMSZ5256C-TP does not specify RoHS status in the provided data. All substitute parts maintain REACH Unaffected status and EAR99 export classification.

Q: Can I use BZT52C30-7-F with ±7% tolerance?

A: BZT52C30-7-F is electrically compatible with 30 V, 500 mW in SOD-123 package. However, the ±7% tolerance is significantly wider than the MMSZ5256C-TP specification of ±2%. Substitution is valid only when the application circuit design permits zener voltage variation between 27.9 V and 32.1 V.

Q: What is Moisture Sensitivity Level (MSL)?

A: MSL indicates the sensitivity of the component to moisture absorption during storage and handling. MSL 1 (Unlimited) means the part has unlimited shelf life and does not require special moisture control during storage or assembly. All substitute parts specify MSL 1.

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