MMSZ5240C-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The MMSZ5240C-TP is a 10 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 device operates across a temperature range of -65°C to 150°C and maintains ±2% voltage tolerance, making it suitable for precision voltage regulation and protection circuits in electronic applications.

Substitute parts are necessary when the primary component experiences supply constraints, extended lead times, or when design flexibility permits selection from alternative manufacturers offering equivalent electrical and mechanical characteristics within the same package family.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	10	V
Power - Maximum	500	mW
Tolerance	±2%	-
Impedance (Maximum)	17	Ohms
Current - Reverse Leakage @ Vr	3	µA @ 8 V
Voltage - Forward (Maximum) @ If	900	mV @ 10 mA
Operating Temperature Range	-65 to 150	°C (TJ)
Package / Case	SOD-123	-
Mounting Type	Surface Mount	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the MMSZ5240C-TP is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 10 V nominal
Package type: SOD-123 surface mount
Mounting configuration: Surface mount
Operating temperature range: Minimum -65°C to 150°C
RoHS3 compliance and MSL 1 rating

Secondary Compatibility Factors:

Power dissipation capacity: 500 mW or greater
Voltage tolerance: ±2% to ±6% acceptable range
Impedance (Zzt): 15 to 20 Ohms maximum
Reverse leakage current: 100 nA to 3 µA range

Substitute parts are grouped into two categories:

Category A - Direct SOD-123 Equivalents (500 mW class): Parts maintaining identical 500 mW power rating and SOD-123 package with 10 V zener voltage. These include CMHZ4697 TR PBFREE and MMSZ4697-E3-08.

Category B - SOD-123 Reduced Power Alternatives (410 mW class): Vishay BZT52 series parts (BZT52B10-E3-08, BZT52C10-E3-08, BZT52C10-E3-18, BZT52C10-HE3-08) offering 410 mW maximum power in SOD-123 package. These are suitable when circuit design permits lower power dissipation.

Category C - Alternative Package Options: Diodes Incorporated parts in different packages (BZT52C10LP-7 in 0402/X1-DFN1006-2, BZT52C10T-7 in SOD-523, DDZ10CS-7 and DDZ9697S-7 in SOD-323) for applications where package footprint flexibility exists.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Power (mW)	Tolerance	Package	Zzt (Ohms)	Ir @ Vr	Temp Range (°C)	Status
MMSZ5240C-TP	Micro Commercial Co	10	500	±2%	SOD-123	17	3 µA @ 8 V	-65 to 150	Active
BZT52B10-E3-08	Vishay	10	410	±2%	SOD-123	15	100 nA @ 7.5 V	-65 to 150	Active
BZT52C10-E3-08	Vishay	10	410	±5%	SOD-123	15	100 nA @ 7.5 V	-55 to 150	Active
BZT52C10-E3-18	Vishay	10	410	±5%	SOD-123	15	100 nA @ 7.5 V	-55 to 150	Active
BZT52C10-HE3-08	Vishay	10	410	±5%	SOD-123	15	100 nA @ 7.5 V	-55 to 150	Obsolete
BZT52C10LP-7	Diodes Incorporated	10	250	±6%	0402 (X1-DFN1006-2)	20	200 nA @ 7 V	-65 to 150	Active
BZT52C10T-7	Diodes Incorporated	10	300	±6%	SOD-523	20	200 nA @ 7 V	-65 to 150	Active
CMHZ4697 TR PBFREE	Central Semiconductor Corp	10	500	±5%	SOD-123	-	1 µA @ 7.6 V	-65 to 150	Active
DDZ10CS-7	Diodes Incorporated	10	200	±2.51%	SOD-323	8	100 nA @ 8 V	-65 to 150	Active
DDZ9697S-7	Diodes Incorporated	10	200	±5%	SOD-323	-	100 nA @ 7.6 V	-65 to 150	Active
MMSZ4697-E3-08	Vishay	10	500	±5%	SOD-123	-	1 µA @ 7.6 V	-	Active

Engineering Selection Recommendations

For Direct Replacement (Same Package, Same Power Rating):

CMHZ4697 TR PBFREE and MMSZ4697-E3-08 are functionally equivalent to MMSZ5240C-TP in SOD-123 packaging with 500 mW power dissipation. Both are Active status components with ROHS3 compliance and MSL 1 rating. CMHZ4697 TR PBFREE offers the widest inventory availability (7099 pcs) and maintains the full -65°C to 150°C operating range. MMSZ4697-E3-08 provides equivalent performance with reduced inventory (1300 pcs).

For Reduced Power Applications (SOD-123 Package):

The Vishay BZT52 series (BZT52B10-E3-08, BZT52C10-E3-08, BZT52C10-E3-18) operates at 410 mW maximum power in SOD-123 packaging. BZT52B10-E3-08 maintains ±2% tolerance matching the primary part and operates across -65°C to 150°C. BZT52C10-E3-08 and BZT52C10-E3-18 feature ±5% tolerance with reduced lower temperature limit (-55°C). BZT52C10-HE3-08 is marked Obsolete and should not be selected for new designs despite AEC-Q101 automotive qualification.

For Alternative Package Configurations:

BZT52C10T-7 (SOD-523, 300 mW) and BZT52C10LP-7 (0402/X1-DFN1006-2, 250 mW) from Diodes Incorporated provide 10 V zener function in smaller packages suitable for space-constrained layouts. DDZ10CS-7 and DDZ9697S-7 in SOD-323 package offer 200 mW power rating with reduced footprint. These alternatives require PCB layout modification and are suitable only when circuit design permits lower power dissipation.

Compliance and Certification:

All recommended Active status parts maintain ROHS3 compliance and MSL 1 (unlimited) moisture sensitivity rating. No automotive-grade qualification is specified for the primary MMSZ5240C-TP; therefore, AEC-Q101 certification is not a selection criterion. All parts carry EAR99 ECCN classification and REACH Unaffected status.

Frequently Asked Questions (FAQ)

Q: Can BZT52C10-E3-08 replace MMSZ5240C-TP directly on the PCB?

A: Yes. Both components use SOD-123 surface mount packaging with identical footprint and pinout. Electrical compatibility exists for applications where 410 mW power dissipation is sufficient. The ±5% tolerance of BZT52C10-E3-08 versus ±2% of MMSZ5240C-TP must be evaluated against circuit voltage regulation requirements.

Q: What is the difference between BZT52B10-E3-08 and BZT52C10-E3-08?

A: Both parts share SOD-123 packaging and 10 V zener voltage. BZT52B10-E3-08 specifies ±2% tolerance with -65°C to 150°C operating range. BZT52C10-E3-08 specifies ±5% tolerance with -55°C to 150°C operating range. Selection depends on voltage accuracy and minimum temperature requirements of the application.

Q: Why do some substitute parts have lower power ratings?

A: BZT52C10LP-7 (250 mW), BZT52C10T-7 (300 mW), and DDZ series parts (200 mW) are designed for applications with lower power dissipation requirements. These parts occupy smaller physical packages, enabling space optimization. Selection requires confirmation that circuit design does not exceed the specified maximum power dissipation.

Q: Is BZT52C10-HE3-08 suitable for new designs?

A: No. BZT52C10-HE3-08 is marked Obsolete status. Although inventory is available (4400 pcs), new designs should not incorporate obsolete components. Active status alternatives such as BZT52C10-E3-08 or BZT52C10-E3-18 are recommended.

Q: Can DDZ9697S-7 or DDZ10CS-7 be used as direct replacements?

A: No. These parts use SOD-323 packaging, which differs from the SOD-123 package of MMSZ5240C-TP. PCB layout modification is required. Additionally, 200 mW power rating is significantly lower than the 500 mW primary part. Use only when circuit design permits package change and power dissipation reduction.

Q: What is the inventory status for substitute parts?

A: CMHZ4697 TR PBFREE offers highest availability (7099 pcs). BZT52C10-E3-08 provides substantial inventory (63238 pcs). BZT52C10T-7 (561910 pcs) and BZT52C10LP-7 (155100 pcs) from Diodes Incorporated offer extensive stock. Vishay BZT52B10-E3-08 (2488 pcs) and BZT52C10-E3-18 (10388 pcs) provide moderate availability.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 Compliant status with MSL 1 (Unlimited) moisture sensitivity level, matching the primary MMSZ5240C-TP component.

Q: What operating temperature range should be verified for substitution?

A: MMSZ5240C-TP operates -65°C to 150°C. BZT52B10-E3-08 and CMHZ4697 TR PBFREE maintain this range. BZT52C10-E3-08, BZT52C10-E3-18, and BZT52C10-HE3-08 operate -55°C to 150°C with reduced lower temperature limit. Verify application minimum temperature requirement before selecting reduced-range alternatives.

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