MMBZ5238B-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The MMBZ5238B-TP is an 8.7 V, 350 mW surface mount zener diode manufactured by Micro Commercial Co in SOT-23 packaging. This component is classified as Active and RoHS3 compliant. Equivalent and substitute parts are identified based on matching electrical specifications (zener voltage, tolerance, impedance, leakage current, and forward voltage) and compatible package configurations. Alternative sources and configurations are necessary to address supply chain requirements, packaging preferences, and application-specific thermal or integration constraints.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	8.7	V
Tolerance	±5%	%
Power - Max	350	mW
Impedance (Max)	8	Ohms
Current - Reverse Leakage @ Vr	3	µA @ 6.5 V
Voltage - Forward (Vf) (Max) @ If	900	mV @ 10 mA
Operating Temperature	-55 to 150	°C
Mounting Type	Surface Mount
Package / Case	TO-236-3, SC-59, SOT-23-3
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the MMBZ5238B-TP are categorized based on electrical parameter compatibility and package configuration. The primary substitution criteria are:

Electrical Matching Parameters:

Zener voltage: 8.7 V nominal
Tolerance: ±5%
Impedance (Max): 8 Ohms
Current - Reverse Leakage @ Vr: 3 µA @ 6.5 V
Voltage - Forward (Vf) (Max) @ If: 900 mV @ 10 mA

Package Compatibility:

Primary package: SOT-23-3 (TO-236-3, SC-59)
Alternative package: SOT-363 (for array configurations)

Substitution Categories:

Upgrade Substitutes feature enhanced specifications or alternative configurations while maintaining core electrical parameters. These parts may offer different power ratings, temperature ranges, or integrated array configurations.

Similar Substitutes maintain identical electrical specifications and package compatibility with the main part, differing primarily by manufacturer or minor operational characteristics.

Parts with different zener voltages (such as MMBZ5251B-7-F at 22 V) are listed as similar but are not direct substitutes due to voltage specification mismatch.

Parameter Comparison

Parameter	MMBZ5238B-TP (Main)	MMBZ5238BS-7-F (Upgrade)	SZMMBZ5238BLT1G (Upgrade)	MMBZ5238B-7-F (Similar)	MMBZ5238BLT1G (Similar)
Manufacturer	Micro Commercial Co	Diodes Incorporated	onsemi	Diodes Incorporated	onsemi
Voltage - Zener (Nom)	8.7 V	8.7 V	8.7 V	8.7 V	8.7 V
Tolerance	±5%	±5%	±5%	±5%	±5%
Power - Max	350 mW	200 mW	225 mW	350 mW	225 mW
Impedance (Max)	8 Ohms	8 Ohms	8 Ohms	8 Ohms	8 Ohms
Current - Reverse Leakage @ Vr	3 µA @ 6.5 V	3 µA @ 6.5 V	3 µA @ 6.5 V	3 µA @ 6.5 V	3 µA @ 6.5 V
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA	900 mV @ 10 mA	900 mV @ 10 mA	900 mV @ 10 mA	900 mV @ 10 mA
Operating Temperature	-55 to 150°C	-65 to 150°C	-65 to 150°C	-65 to 150°C	-65 to 150°C
Package / Case	SOT-23-3	SOT-363	SOT-23-3	SOT-23-3	SOT-23-3
Configuration	Single	2 Independent	Single	Single	Single
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Direct Substitutes (SOT-23-3 Package, 8.7 V, 350 mW):

MMBZ5238B-7-F (Diodes Incorporated) is a direct equivalent to the MMBZ5238B-TP. Both parts maintain identical electrical specifications and SOT-23-3 packaging. This part is suitable for applications requiring the full 350 mW power rating and is RoHS3 compliant with Active product status.

Reduced Power Alternatives (SOT-23-3 Package, 8.7 V):

MMBZ5238BLT1G (onsemi) and SZMMBZ5238BLT1G (onsemi) are suitable substitutes for applications where power dissipation is limited to 225 mW. Both maintain SOT-23-3 packaging and identical electrical characteristics. SZMMBZ5238BLT1G carries AEC-Q101 automotive qualification and is designated for automotive-grade applications. Both parts support extended operating temperature range (-65 to 150°C) and are RoHS3 compliant.

Array Configuration Alternative (SOT-363 Package, 8.7 V):

MMBZ5238BS-7-F (Diodes Incorporated) provides a 2-independent zener diode array in SOT-363 packaging. This part is applicable for space-constrained designs requiring multiple 8.7 V zener functions. Power rating per diode is 200 mW. All electrical parameters match the main part. This configuration is RoHS3 compliant and Active.

Non-Substitute Reference:

MMBZ5251B-7-F (Diodes Incorporated) operates at 22 V nominal zener voltage and is not a substitute for the MMBZ5238B-TP due to voltage specification mismatch. This part is listed for reference only.

All substitute parts listed are Active, RoHS3 compliant, and REACH unaffected, meeting regulatory requirements equivalent to the main part.

Frequently Asked Questions (FAQ)

Q: Can MMBZ5238B-7-F replace MMBZ5238B-TP in all applications?

A: Yes. MMBZ5238B-7-F is manufactured by Diodes Incorporated and maintains identical electrical specifications (8.7 V, 350 mW, ±5% tolerance, 8 Ohms impedance) and SOT-23-3 packaging. Both parts are RoHS3 compliant and Active status.

Q: What is the difference between MMBZ5238BLT1G and MMBZ5238B-TP?

A: MMBZ5238BLT1G is manufactured by onsemi with a reduced maximum power rating of 225 mW compared to 350 mW for the main part. Both maintain 8.7 V zener voltage, ±5% tolerance, and SOT-23-3 packaging. MMBZ5238BLT1G supports an extended operating temperature range (-65 to 150°C versus -55 to 150°C) and is suitable for applications with lower power dissipation requirements.

Q: Is SZMMBZ5238BLT1G suitable for automotive applications?

A: Yes. SZMMBZ5238BLT1G is qualified to AEC-Q101 automotive standard and carries automotive-grade designation. It maintains 8.7 V zener voltage, 225 mW power rating, and SOT-23-3 packaging. This part is appropriate for automotive circuit protection and voltage regulation applications.

Q: Can MMBZ5238BS-7-F be used as a direct replacement?

A: MMBZ5238BS-7-F is not a direct replacement due to package and configuration differences. This part is a 2-independent zener diode array in SOT-363 packaging, whereas the main part is a single diode in SOT-23-3. MMBZ5238BS-7-F is suitable for applications requiring multiple zener functions in a compact footprint. Power rating per diode is 200 mW.

Q: What are the key electrical parameters that determine substitutability?

A: Substitutability is determined by: zener voltage (8.7 V nominal), tolerance (±5%), impedance (8 Ohms maximum), reverse leakage current (3 µA @ 6.5 V), and forward voltage (900 mV @ 10 mA). Parts matching these parameters are electrically compatible. Package compatibility (SOT-23-3 or SOT-363) and power rating requirements determine physical and thermal suitability.

Q: Are all listed substitutes RoHS3 compliant?

A: Yes. All substitute parts listed (MMBZ5238B-7-F, MMBZ5238BLT1G, SZMMBZ5238BLT1G, and MMBZ5238BS-7-F) are RoHS3 compliant and REACH unaffected, matching the regulatory status of the main part MMBZ5238B-TP.

Q: What is the inventory status of substitute parts?

A: MMBZ5238BLT1G (onsemi) has the highest inventory at 61,100 pieces. MMBZ5238B-7-F (Diodes Incorporated) has 7,692 pieces. SZMMBZ5238BLT1G (onsemi) has 15,607 pieces. MMBZ5238BS-7-F (Diodes Incorporated) has 1,404 pieces. The main part MMBZ5238B-TP has 3,778 pieces in stock.

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