MMSZ5243C-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The MMSZ5243C-TP is a 13 V, 500 mW surface mount zener diode manufactured by Micro Commercial Co in SOD-123 packaging. This component is classified as an interface diode and maintains Active product status. The part operates across a temperature range of -55°C to 150°C with a nominal zener voltage tolerance of ±2%.

Equivalent and substitute parts are identified based on matching or compatible electrical characteristics and mechanical specifications. Substitutes may differ in tolerance specifications, impedance ratings, reverse leakage current, packaging format, or temperature operating range while maintaining functional equivalence for 13 V zener regulation applications.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	13	V
Tolerance	±2%	—
Power - Max	500	mW
Impedance (Max)	13	Ohms
Current - Reverse Leakage @ Vr	1	µA @ 9.9 V
Voltage - Forward (Vf) (Max) @ If	900	mV @ 10 mA
Operating Temperature	-55 to 150	°C (TJ)
Mounting Type	Surface Mount	—
Package / Case	SOD-123	—

Substitute Part Grouping Explanation

Substitution eligibility for the MMSZ5243C-TP is determined by the following critical parameters:

Primary Matching Criteria:

Zener voltage nominal value: 13 V
Mounting type: Surface Mount
Package type: SOD-123 (primary) or SOD-323 (reduced power alternative)
Power dissipation capability: 500 mW (primary) or 200-410 mW (reduced power alternatives)

Secondary Compatibility Factors:

Zener voltage tolerance: ±2% to ±6.42% acceptable range
Impedance (Zzt): 13 to 30 Ohms
Reverse leakage current: 100 nA to 1 µA
Forward voltage: 900 mV @ 10 mA
Operating temperature range: -55°C to -65°C minimum; 150°C maximum

Substitutes are grouped into two categories: Direct Equivalents (matching 13 V, 500 mW, SOD-123) and Functional Alternatives (13 V regulation with reduced power rating or different package format).

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Package	Temp Range	RoHS Status
MMSZ5243C-TP	Micro Commercial Co	13 V	±2%	500 mW	13 Ω	SOD-123	-55 to 150°C	REACH Unaffected
MMSZ5243C-E3-08	Vishay General Semiconductor	13 V	±2%	500 mW	13 Ω	SOD-123	-55 to 150°C	ROHS3 Compliant
MMSZ5243B-E3-08	Vishay General Semiconductor	13 V	±5%	500 mW	13 Ω	SOD-123	-55 to 150°C	ROHS3 Compliant
MMSZ5243B-7-F	Diodes Incorporated	13 V	±5%	500 mW	13 Ω	SOD-123	-65 to 150°C	ROHS3 Compliant
DDZ13B-7	Diodes Incorporated	13 V	±3%	500 mW	14 Ω	SOD-123	-65 to 150°C	ROHS3 Compliant
BZT52C13-7-F	Diodes Incorporated	13 V	±6.42%	500 mW	30 Ω	SOD-123	-65 to 150°C	ROHS3 Compliant
BZT52C13-E3-08	Vishay General Semiconductor	13 V	±5%	410 mW	25 Ω	SOD-123	-55 to 150°C	ROHS3 Compliant
BZT52C13S-7-F	Diodes Incorporated	13 V	±6%	200 mW	30 Ω	SOD-323	-65 to 150°C	ROHS3 Compliant
DDZ13BS-7	Diodes Incorporated	12.88 V	±2.56%	200 mW	14 Ω	SOD-323	-65 to 150°C	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalents (Highest Compatibility):

MMSZ5243C-E3-08 and MMSZ5243B-E3-08 are direct substitutes from Vishay General Semiconductor. Both maintain identical zener voltage (13 V), power rating (500 mW), impedance (13 Ω), and operating temperature range (-55 to 150°C). MMSZ5243C-E3-08 matches the ±2% tolerance specification of the main part. Both are ROHS3 Compliant with Unlimited MSL rating.

MMSZ5243B-7-F from Diodes Incorporated provides 500 mW power dissipation with 13 V zener voltage and SOD-123 packaging. This part extends the minimum operating temperature to -65°C and carries ±5% tolerance. ROHS3 Compliant status and Unlimited MSL rating apply.

Primary Functional Alternatives (500 mW, SOD-123):

DDZ13B-7 from Diodes Incorporated delivers 500 mW at 13 V with ±3% tolerance and 14 Ω impedance. Operating temperature extends to -65°C minimum. ROHS3 Compliant with Unlimited MSL.

BZT52C13-7-F from Diodes Incorporated maintains 500 mW and 13 V specifications with SOD-123 packaging. Tolerance is ±6.42% and impedance is 30 Ω. Temperature range extends to -65°C. ROHS3 Compliant with Unlimited MSL.

Secondary Alternatives (Reduced Power Rating):

BZT52C13-E3-08 from Vishay General Semiconductor provides 410 mW power dissipation at 13 V with ±5% tolerance. Impedance is 25 Ω. Operating temperature matches the main part (-55 to 150°C). ROHS3 Compliant with Unlimited MSL. This part is suitable for applications where 410 mW dissipation is sufficient.

BZT52C13S-7-F and DDZ13BS-7 are 200 mW alternatives in SOD-323 packaging. Both maintain 13 V nominal zener voltage. BZT52C13S-7-F carries ±6% tolerance; DDZ13BS-7 carries ±2.56% tolerance with 12.88 V nominal voltage. These parts are suitable for space-constrained designs with lower power requirements. Both extend minimum operating temperature to -65°C and are ROHS3 Compliant with Unlimited MSL.

Compliance Status:

All substitute parts listed carry REACH Unaffected or REACH Compliant status and ROHS3 Compliant certification. All are classified under ECCN EAR99 and HTSUS 8541.10.0050.

Frequently Asked Questions (FAQ)

Q: Can MMSZ5243B-E3-08 replace MMSZ5243C-TP directly?

A: MMSZ5243B-E3-08 is a direct substitute with identical electrical specifications except for tolerance. The main part specifies ±2% tolerance; MMSZ5243B-E3-08 specifies ±5% tolerance. Both maintain 13 V nominal zener voltage, 500 mW power rating, 13 Ω impedance, and -55 to 150°C operating range. Selection depends on tolerance requirements for the application.

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

A: SOD-123 and SOD-323 are both surface mount diode packages with different physical dimensions. SOD-323 (also designated SC-76) is smaller than SOD-123. Substitutes using SOD-323 packaging (BZT52C13S-7-F, DDZ13BS-7) are suitable for space-constrained PCB layouts. Verify PCB footprint compatibility before selecting a SOD-323 alternative.

Q: Can I use BZT52C13-E3-08 (410 mW) instead of the 500 mW main part?

A: BZT52C13-E3-08 is suitable if the application circuit dissipates 410 mW or less. If the design requires full 500 mW dissipation capability, this part is not appropriate. Verify actual power dissipation requirements in the application before substitution.

Q: What does the ±2% tolerance specification mean?

A: The ±2% tolerance on MMSZ5243C-TP indicates that the actual zener voltage will fall within the range of 12.74 V to 13.26 V (13 V ± 2%). Parts with ±5% or ±6% tolerance have wider voltage ranges. Applications requiring precise voltage regulation benefit from tighter tolerance specifications.

Q: Are all substitute parts ROHS3 compliant?

A: All substitute parts listed carry ROHS3 Compliant certification. The main part MMSZ5243C-TP carries REACH Unaffected status. Verify compliance requirements for your specific application and supply chain.

Q: What is the significance of impedance (Zzt) differences?

A: Impedance (Zzt) affects the zener diode's dynamic response and voltage regulation characteristics. The main part specifies 13 Ω maximum impedance. Substitutes range from 13 Ω to 30 Ω. Lower impedance values provide better voltage regulation stability. Applications with stringent regulation requirements should prioritize substitutes with impedance values closest to the main part specification.

Q: Can I substitute a part with a lower operating temperature minimum?

A: The main part operates from -55°C minimum. Substitutes extending to -65°C minimum provide broader temperature coverage and are suitable for all applications requiring -55°C operation. Conversely, substitutes limited to -55°C minimum are not suitable for applications requiring -65°C operation.

Q: What is the difference between reverse leakage current specifications?

A: Reverse leakage current indicates the small current flowing through the diode when reverse biased. The main part specifies 1 µA @ 9.9 V. Substitutes specify 100 nA to 500 nA at various reverse voltages. Lower leakage current values indicate better diode quality and lower standby power consumption. Applications sensitive to leakage current should prioritize substitutes with lower leakage specifications.

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