MMSZ5243BS-7 Zener Diode 13V 200mW SOD-323 Equivalent & Substitute Parts

Part Overview

The MMSZ5243BS-7 is a 13 V zener diode rated for 200 mW maximum power dissipation in a surface mount SOD-323 package. Manufactured by Diodes Incorporated, this component is designed for voltage regulation and protection applications requiring precise 13 V reference voltage with ±5% tolerance. The part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives from active product lines. Substitute parts must maintain the 13 V nominal zener voltage, SOD-323 package form factor, and surface mount compatibility while meeting or exceeding the original electrical specifications.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	13	V
Tolerance	±5%	%
Power - Max	200	mW
Impedance (Max)	13	Ohms
Current - Reverse Leakage @ Vr	500 nA @ 9.9 V	nA
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA	mV
Operating Temperature Range	-65°C to 150°C	°C
Mounting Type	Surface Mount	—
Package / Case	SC-76, SOD-323	—

Substitute Part Grouping Explanation

Substitution of the MMSZ5243BS-7 is determined by the following critical parameters:

Primary Matching Criteria:

Nominal zener voltage: 13 V (exact match required)
Package type: SOD-323 (physical and electrical compatibility)
Mounting type: Surface Mount (PCB assembly compatibility)
Operating temperature range: minimum -65°C to 150°C coverage

Secondary Compatibility Criteria:

Power rating: 200 mW or greater (equal or higher dissipation capability)
Voltage tolerance: ±5% or tighter (equal or better accuracy)
Impedance: 13 Ohms or lower (equal or better dynamic response)
Reverse leakage current: 500 nA @ 9.9 V or lower (equal or better leakage performance)
Forward voltage: 900 mV @ 10 mA or lower (equal or better forward conduction)

Substitute parts are grouped into two categories: Parametric Equivalents (matching all primary and secondary criteria) and Functional Alternatives (matching primary criteria with acceptable variations in secondary parameters). All substitute parts listed maintain the 13 V zener voltage and SOD-323 package requirement.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Leakage @ Vr	Vf @ If	Temp Range (°C)	Status	RoHS
MMSZ5243BS-7	Diodes Inc.	13	±5%	200	13	500 nA @ 9.9 V	900 mV @ 10 mA	-65 to 150	Discontinued	Non-compliant
MMSZ5243BS-7-F	Diodes Inc.	13	±5%	200	13	500 nA @ 9.9 V	900 mV @ 10 mA	-65 to 150	Active	ROHS3 Compliant
BZT52C13S-7-F	Diodes Inc.	13	±6%	200	30	100 nA @ 8 V	900 mV @ 10 mA	-65 to 150	Active	ROHS3 Compliant
BZT52C13S-TP	Micro Commercial Co	13	±6%	200	30	100 nA @ 8 V	900 mV @ 10 mA	-65 to 150	Active	ROHS3 Compliant
BZX384-C13,115	Nexperia USA Inc.	13	±5%	300	30	100 nA @ 8 V	1.1 V @ 100 mA	-65 to 150	Active	ROHS3 Compliant
BZX384B13-E3-08	Vishay General Semiconductor	13	±2%	200	30	100 nA @ 8 V	Not specified	-55 to 150	Active	ROHS3 Compliant
CMDZ13L TR PBFREE	Central Semiconductor Corp	13	±5%	250	80	1 µA @ 10.5 V	900 mV @ 10 mA	-65 to 150	Active	ROHS3 Compliant
CMDZ5243B TR PBFREE	Central Semiconductor Corp	13	±5%	250	13	500 nA @ 9.9 V	900 mV @ 10 mA	-65 to 150	Active	ROHS3 Compliant
PZU13B2A,115	Nexperia USA Inc.	13	±2%	320	10	100 nA @ 10 V	1.1 V @ 100 mA	-55 to 150	Active	ROHS3 Compliant

Engineering Selection Recommendations

Parametric Equivalent (Direct Replacement):

MMSZ5243BS-7-F is the direct parametric equivalent. This part maintains identical electrical specifications to the original MMSZ5243BS-7, including 13 V nominal voltage, ±5% tolerance, 200 mW power rating, 13 Ohms impedance, and 500 nA reverse leakage current. The primary distinction is product status: MMSZ5243BS-7-F is active and ROHS3 compliant, whereas the original is discontinued and RoHS non-compliant. This part is suitable for direct substitution without circuit redesign.

Functional Alternatives with Acceptable Variations:

BZT52C13S-7-F and BZT52C13S-TP are functionally equivalent alternatives from Diodes Incorporated and Micro Commercial Co respectively. Both maintain 13 V nominal voltage, 200 mW power rating, and -65°C to 150°C operating range. Tolerance is ±6% (versus ±5% original), impedance is 30 Ohms (versus 13 Ohms original), and reverse leakage is 100 nA @ 8 V (versus 500 nA @ 9.9 V original). These parts are suitable for applications where the tighter impedance and lower leakage characteristics are acceptable or beneficial.

CMDZ5243B TR PBFREE provides identical impedance (13 Ohms) and leakage characteristics (500 nA @ 9.9 V) to the original, with increased power rating of 250 mW. Tolerance remains ±5%. This part is suitable for applications requiring enhanced thermal margin.

Higher Power Alternatives:

BZX384-C13,115 offers 300 mW power rating with ±5% tolerance, matching the original voltage tolerance. This part is suitable for applications requiring increased power dissipation capability.

PZU13B2A,115 provides 320 mW power rating with ±2% tolerance (tighter than original), 10 Ohms impedance, and 100 nA reverse leakage. Operating temperature range is -55°C to 150°C (upper limit unchanged, lower limit -55°C versus -65°C original). This part is suitable for precision applications where tighter voltage tolerance is required.

Tighter Tolerance Alternative:

BZX384B13-E3-08 offers ±2% tolerance (versus ±5% original) with 200 mW power rating. Operating temperature range is -55°C to 150°C. This part is suitable for applications requiring improved voltage accuracy.

All recommended substitutes are ROHS3 compliant and active products with established supply availability.

Frequently Asked Questions (FAQ)

Q: Can MMSZ5243BS-7-F be used as a direct replacement for MMSZ5243BS-7?

A: Yes. MMSZ5243BS-7-F is a parametric equivalent with identical electrical specifications. The only differences are product status (active versus discontinued) and RoHS compliance (ROHS3 compliant versus non-compliant). No circuit modifications are required.

Q: What is the difference between ±5% and ±6% tolerance zener diodes?

A: Tolerance specifies the allowable deviation of the nominal zener voltage from the specified 13 V value. ±5% tolerance allows deviation of ±0.65 V (12.35 V to 13.65 V), while ±6% tolerance allows ±0.78 V (12.22 V to 13.78 V). Selection depends on circuit requirements for voltage regulation accuracy.

Q: Why do some substitute parts have higher impedance values?

A: Impedance (Zzt) represents the dynamic resistance of the zener diode at the test current. Higher impedance values indicate greater voltage variation with changes in zener current. Lower impedance (13 Ohms) provides better voltage regulation stability. Parts with 30 Ohms impedance are suitable for applications with stable load conditions.

Q: Can I use a higher power-rated zener diode as a substitute?

A: Yes. A zener diode with equal or higher power rating can be substituted provided all other electrical parameters (voltage, tolerance, impedance, leakage) meet circuit requirements. Higher power rating provides additional thermal margin but does not change voltage regulation characteristics.

Q: What is the significance of reverse leakage current specifications?

A: Reverse leakage current indicates the small current flowing through the zener diode when reverse-biased below the zener voltage. Lower leakage current reduces power consumption in standby conditions and improves circuit efficiency. The original part specifies 500 nA @ 9.9 V; alternatives with 100 nA leakage offer improved performance.

Q: Are all substitute parts available in the same packaging?

A: Yes. All substitute parts listed use the SOD-323 package (SC-76 case). Physical dimensions and PCB footprints are identical, allowing direct board-level substitution without layout modifications.

Q: What is the difference between Cut Tape (CT) and Tape & Reel (TR) packaging?

A: Cut Tape packaging provides components in individual strips suitable for manual assembly or small-volume production. Tape & Reel packaging provides components on continuous reels suitable for automated pick-and-place assembly. Electrical specifications are identical; packaging selection depends on assembly process requirements.

Q: Can I substitute a part with a lower operating temperature minimum (-55°C versus -65°C)?

A: Substitution is acceptable if the application does not require operation below -55°C. If the circuit must function at temperatures below -55°C, parts with -65°C minimum rating (such as MMSZ5243BS-7-F or BZT52C13S-7-F) are required.

Q: What does RoHS3 compliance mean?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting use of lead, cadmium, mercury, and other hazardous materials. All active substitute parts listed are ROHS3 compliant, suitable for applications requiring environmental compliance.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message