MMXZ5248B-TP Zener Diode 18V 200mW SOD-323 Equivalent & Substitute Parts

Part Overview

The MMXZ5248B-TP is an 18 V, 200 mW surface mount zener diode manufactured by Micro Commercial Co in SOD-323 packaging. This component is classified as Active product status and is ROHS3 compliant. Equivalent and substitute parts are identified when design requirements permit tolerance variations, power rating increases, or package format changes while maintaining the core electrical function of voltage regulation at 18 V nominal.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	18	V
Tolerance	±5%	—
Power - Max	200	mW
Impedance (Max)	21	Ohms
Current - Reverse Leakage @ Vr	100 nA @ 14 V	—
Voltage - Forward (Max)	1.2 V @ 100 mA	—
Operating Temperature	-55°C to 150°C	—
Mounting Type	Surface Mount	—
Package / Case	SC-76, SOD-323	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the MMXZ5248B-TP are categorized based on the following substitution criteria:

Direct Electrical Equivalents maintain the same nominal zener voltage (18 V), tolerance (±5%), and power rating (200 mW) with identical or compatible package formats. These parts are interchangeable without circuit redesign.

Higher Power Rating Substitutes provide 18 V nominal zener voltage with power ratings exceeding 200 mW (310 mW, 400 mW, 500 mW, or 550 mW). These are suitable when thermal margin or current handling capacity requires enhancement.

Tighter Tolerance Variants offer ±2% tolerance instead of ±5%, providing improved voltage regulation accuracy while maintaining 18 V nominal and compatible power ratings.

Package Format Variants include SOD-323F (SC-90) packaging instead of SOD-323 (SC-76). Both are surface mount formats with compatible footprints for most applications.

Automotive Grade Options include AEC-Q101 or AEC-Q100 qualified parts suitable for automotive applications.

The following parameters determine substitution eligibility:

Nominal zener voltage: 18 V (±0.04 V tolerance acceptable for D3Z18BF-7 at 17.96 V)
Mounting type: Surface Mount
RoHS compliance: ROHS3 Compliant
Operating temperature range: Minimum -55°C to 150°C

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Vf (Max)	Temp Range	Package	Automotive Grade
MMXZ5248B-TP	Micro Commercial Co	18 V	±5%	200 mW	21 Ω	1.2 V @ 100 mA	-55 to 150°C	SOD-323	—
MMSZ5248BS-7-F	Diodes Incorporated	18 V	±5%	200 mW	21 Ω	900 mV @ 10 mA	-65 to 150°C	SOD-323	—
DDZ9705S-7	Diodes Incorporated	18 V	±5%	200 mW	—	900 mV @ 10 mA	-65 to 150°C	SOD-323	—
BZX84J-C18,115	Nexperia USA Inc.	18 V	±5%	550 mW	20 Ω	1.1 V @ 100 mA	-65 to 150°C	SOD-323F	AEC-Q101
BZX84J-B18,115	Nexperia USA Inc.	18 V	±2%	550 mW	20 Ω	1.1 V @ 100 mA	-65 to 150°C	SOD-323F	AEC-Q101
D3Z18BF-7	Diodes Incorporated	17.96 V	±2%	400 mW	20 Ω	1.1 V @ 100 mA	-65 to 150°C	SOD-323F	—
MM3Z18VB	onsemi	18 V	±2%	200 mW	42 Ω	1 V @ 10 mA	-65 to 150°C	SOD-323F	—
MM3Z18VC	onsemi	18 V	±5%	200 mW	42 Ω	1 V @ 10 mA	-65 to 150°C	SOD-323F	—
PZU18B,115	Nexperia USA Inc.	18 V	±5%	310 mW	20 Ω	1.1 V @ 100 mA	-65 to 150°C	SOD-323F	AEC-Q100
PZU18B2,115	Nexperia USA Inc.	18 V	±2%	310 mW	20 Ω	1.1 V @ 100 mA	-65 to 150°C	SOD-323F	AEC-Q100
TDZ18J,115	Nexperia USA Inc.	18 V	±2%	500 mW	20 Ω	1.1 V @ 100 mA	-55 to 150°C	SOD-323F	AEC-Q101

Engineering Selection Recommendations

Direct Replacement (Same Electrical and Mechanical Specifications)

MMSZ5248BS-7-F (Diodes Incorporated) and DDZ9705S-7 (Diodes Incorporated) are direct electrical equivalents with 18 V nominal, ±5% tolerance, and 200 mW power rating in SOD-323 packaging. Both are Active product status and ROHS3 compliant. MMSZ5248BS-7-F extends the operating temperature range to -65°C, providing additional thermal margin.

Substitutes with Enhanced Power Handling

BZX84J-C18,115 (Nexperia USA Inc.) provides 550 mW power rating with ±5% tolerance and 18 V nominal voltage. This part is AEC-Q101 qualified and suitable for automotive applications. The SOD-323F package is mechanically compatible with SOD-323 footprints. Higher power rating accommodates increased thermal dissipation requirements.

PZU18B,115 (Nexperia USA Inc.) offers 310 mW power rating with ±5% tolerance, 18 V nominal, and AEC-Q100 automotive qualification. This intermediate power option bridges the gap between 200 mW and higher ratings.

TDZ18J,115 (Nexperia USA Inc.) provides 500 mW power rating with ±2% tolerance, 18 V nominal, and AEC-Q101 automotive qualification. Operating temperature range matches the original part (-55°C to 150°C).

Substitutes with Improved Voltage Tolerance

BZX84J-B18,115 (Nexperia USA Inc.) maintains 18 V nominal with tighter ±2% tolerance and 550 mW power rating. AEC-Q101 qualification supports automotive applications.

MM3Z18VB (onsemi) provides ±2% tolerance with 18 V nominal and 200 mW power rating. SOD-323F packaging is mechanically compatible.

PZU18B2,115 (Nexperia USA Inc.) offers ±2% tolerance with 18 V nominal, 310 mW power rating, and AEC-Q100 automotive qualification.

Substitutes with Nominal Voltage Variation

D3Z18BF-7 (Diodes Incorporated) operates at 17.96 V nominal (within ±2% tolerance of 18 V specification) with 400 mW power rating and ±2% tolerance. This part is suitable when the application tolerates the slight voltage offset.

Substitutes with Package Format Change

MM3Z18VC (onsemi) provides SOD-323F packaging with 18 V nominal, ±5% tolerance, and 200 mW power rating. This variant maintains electrical equivalence with package format upgrade.

All substitute parts listed are Active product status and ROHS3 compliant, meeting regulatory requirements equivalent to the original part.

Frequently Asked Questions (FAQ)

Q: Can MMSZ5248BS-7-F replace MMXZ5248B-TP directly?

A: Yes. MMSZ5248BS-7-F is a direct electrical equivalent with identical 18 V nominal, ±5% tolerance, and 200 mW power rating in SOD-323 packaging. Both are ROHS3 compliant and Active product status. The substitute extends the operating temperature range to -65°C, providing additional thermal margin.

Q: What is the difference between SOD-323 and SOD-323F packaging?

A: SOD-323 (SC-76) and SOD-323F (SC-90) are both surface mount diode packages with compatible footprints. SOD-323F is a variant with enhanced thermal characteristics. Parts in either package format are mechanically interchangeable for most PCB layouts.

Q: Can I use BZX84J-C18,115 instead of MMXZ5248B-TP?

A: Yes, with design consideration. BZX84J-C18,115 maintains 18 V nominal and ±5% tolerance but provides 550 mW power rating versus 200 mW. The higher power rating is suitable when thermal dissipation capacity or current handling requires enhancement. AEC-Q101 automotive qualification is an additional benefit. Package format is SOD-323F, which is mechanically compatible.

Q: What does ±2% tolerance mean compared to ±5%?

A: ±2% tolerance provides tighter voltage regulation accuracy. For an 18 V zener, ±2% tolerance constrains the voltage to 17.64 V to 18.36 V, while ±5% allows 17.1 V to 18.9 V. Tighter tolerance variants (BZX84J-B18,115, MM3Z18VB, PZU18B2,115) are suitable when voltage regulation precision is critical.

Q: Is D3Z18BF-7 a suitable substitute despite 17.96 V nominal voltage?

A: D3Z18BF-7 operates at 17.96 V nominal with ±2% tolerance, resulting in a voltage range of 17.61 V to 18.31 V. This overlaps the 18 V specification and is suitable when the application tolerates the slight voltage offset. The part offers 400 mW power rating and improved tolerance accuracy.

Q: Which substitute parts have automotive qualification?

A: BZX84J-C18,115 and BZX84J-B18,115 (Nexperia) are AEC-Q101 qualified. PZU18B,115 and PZU18B2,115 (Nexperia) are AEC-Q100 qualified. TDZ18J,115 (Nexperia) is AEC-Q101 qualified. These parts are suitable for automotive applications requiring formal qualification.

Q: What is impedance (Zzt) and why does it vary among substitutes?

A: Impedance (Zzt) represents the dynamic resistance of the zener diode at the specified test current. Lower impedance indicates better voltage regulation stability. The original MMXZ5248B-TP specifies 21 Ω maximum. Most substitutes specify 20 Ω, providing equivalent or superior performance. MM3Z18VB and MM3Z18VC specify 42 Ω, which is acceptable for applications with less stringent regulation requirements.

Q: Can I use a higher power rating substitute in a design rated for 200 mW?

A: Yes. Higher power rating substitutes (310 mW, 400 mW, 500 mW, 550 mW) are backward compatible with 200 mW designs. The higher rating provides additional thermal margin and current handling capacity without affecting circuit function. Verify that the PCB layout and thermal management accommodate the substitute part if increased power dissipation is expected.

Q: Are all listed substitutes ROHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant, meeting regulatory requirements equivalent to the original MMXZ5248B-TP.

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

A: Tape & Reel (TR) packaging supplies components on continuous tape in reel format, suitable for high-volume automated assembly. Cut Tape (CT) supplies components on tape segments, suitable for lower-volume or manual assembly. Both formats contain identical components; packaging format selection depends on assembly process requirements.

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