MMXZ5251B-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The MMXZ5251B-TP is a 22 V, 200 mW surface mount zener diode manufactured by Micro Commercial Co in SOD-323 packaging. This component is classified as Active and is in current production. Equivalent and substitute parts are identified when design requirements necessitate alternative sourcing, inventory availability, or when specific performance parameters align with application needs.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	22	V
Tolerance	±5%	-
Power - Maximum	200	mW
Impedance (Maximum)	29	Ohms
Current - Reverse Leakage @ Vr	100 nA @ 17 V	-
Voltage - Forward (Maximum) @ If	1.2 V @ 100 mA	-
Operating Temperature Range	-55°C to 150°C	-
Mounting Type	Surface Mount	-
Package / Case	SOD-323	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the MMXZ5251B-TP is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 22 V nominal
Power dissipation: 200 mW maximum
Tolerance: ±5% or tighter
Package type: SOD-323 or SOD-323F
Mounting: Surface Mount
Operating temperature range: Minimum -55°C to 150°C
RoHS3 compliance

Substitute Classification:

Direct Equivalents maintain all electrical specifications and package compatibility within the SOD-323 family. These parts are pin-for-pin compatible and functionally interchangeable.

Functional Alternatives meet the core electrical requirements (22 V zener voltage, 200 mW power rating) but may differ in secondary parameters such as impedance, reverse leakage current, or forward voltage characteristics. These parts are suitable for applications where the primary zener voltage and power rating are the controlling design factors.

Enhanced Alternatives exceed the specified power rating or improve upon tolerance specifications while maintaining the 22 V zener voltage and SOD-323 package family. These parts provide additional design margin and are suitable for applications requiring higher reliability or tighter voltage regulation.

Parameter Comparison

Parameter	MMXZ5251B-TP (Main)	MMSZ5251BS-7-F (Upgrade)	DDZ9708S-7 (Similar)	MM3Z22VB (Similar)	BZX84J-B22,115 (Similar)
Manufacturer	Micro Commercial Co	Diodes Incorporated	Diodes Incorporated	onsemi	NXP USA Inc.
Voltage - Zener (Nom)	22 V	22 V	22 V	22 V	22 V
Tolerance	±5%	±5%	±5%	±2%	±2%
Power - Max	200 mW	200 mW	200 mW	200 mW	550 mW
Impedance (Max)	29 Ohms	29 Ohms	Not specified	51 Ohms	25 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 17 V	100 nA @ 17 V	50 nA @ 16.7 V	45 nA @ 15.4 V	50 nA @ 15.4 V
Voltage - Forward (Max) @ If	1.2 V @ 100 mA	900 mV @ 10 mA	900 mV @ 10 mA	1 V @ 10 mA	1.1 V @ 100 mA
Operating Temperature	-55°C to 150°C	-65°C to 150°C	-65°C to 150°C	-65°C to 150°C	-65°C to 150°C
Package / Case	SOD-323	SOD-323	SOD-323	SOD-323F	SOD-323F
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified
Inventory (Pcs)	674	47400	27200	1492	23701

Engineering Selection Recommendations

MMSZ5251BS-7-F (Diodes Incorporated)

This part is a direct upgrade equivalent to the MMXZ5251B-TP. It maintains identical electrical specifications (22 V, 200 mW, ±5% tolerance) and SOD-323 packaging. The MMSZ5251BS-7-F extends the operating temperature range to -65°C and offers significantly higher inventory availability (47,400 units). Both parts are ROHS3 compliant. This part is suitable for direct substitution in all applications where the MMXZ5251B-TP is specified.

DDZ9708S-7 (Diodes Incorporated)

This part meets the core electrical requirements with 22 V zener voltage and 200 mW power rating in SOD-323 packaging. It maintains ±5% tolerance and ROHS3 compliance. The DDZ9708S-7 offers improved reverse leakage characteristics (50 nA @ 16.7 V versus 100 nA @ 17 V) and extends the operating temperature range to -65°C. Inventory availability is 27,200 units. This part is suitable for substitution in applications where the primary design criteria are zener voltage and power dissipation.

MM3Z22VB (onsemi)

This part provides a 22 V zener voltage with 200 mW power rating in SOD-323F packaging. It offers tighter tolerance (±2% versus ±5%) and improved reverse leakage characteristics (45 nA @ 15.4 V). The operating temperature range extends to -65°C. The SOD-323F package is mechanically compatible with SOD-323 applications. This part is suitable for applications requiring tighter voltage regulation. Inventory availability is 1,492 units.

BZX84J-B22,115 (NXP USA Inc.)

This part provides enhanced power dissipation capability (550 mW versus 200 mW) with 22 V zener voltage and tighter tolerance (±2%). It is qualified to AEC-Q101 automotive standards and operates across -65°C to 150°C. The SOD-323F package is mechanically compatible with SOD-323 applications. This part is suitable for applications requiring higher power handling or automotive-grade reliability. Inventory availability is 23,701 units.

Frequently Asked Questions (FAQ)

Q: Can MMSZ5251BS-7-F be used as a direct replacement for MMXZ5251B-TP?

A: Yes. Both parts share identical zener voltage (22 V), power rating (200 mW), tolerance (±5%), and SOD-323 packaging. The MMSZ5251BS-7-F extends the operating temperature range to -65°C and is ROHS3 compliant. No circuit modifications are required.

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

A: SOD-323F is a variant of the SOD-323 package family. Both are surface mount packages with compatible pin configurations and footprints. Parts specified in SOD-323F (MM3Z22VB, BZX84J-B22,115) are mechanically compatible with SOD-323 applications.

Q: Can BZX84J-B22,115 replace MMXZ5251B-TP in all applications?

A: BZX84J-B22,115 maintains the 22 V zener voltage and is mechanically compatible. However, it provides 550 mW power dissipation versus the specified 200 mW. This higher power rating introduces additional design margin and is suitable for applications where the primary requirement is 22 V voltage regulation. Verify that the higher power rating does not introduce unintended thermal effects in the specific application.

Q: Which substitute part offers the tightest voltage tolerance?

A: Both MM3Z22VB and BZX84J-B22,115 offer ±2% tolerance compared to the ±5% tolerance of MMXZ5251B-TP. These parts provide tighter voltage regulation for applications requiring improved accuracy.

Q: Are all substitute parts RoHS3 compliant?

A: MMSZ5251BS-7-F, DDZ9708S-7, and MM3Z22VB are explicitly ROHS3 compliant. RoHS status for BZX84J-B22,115 is not specified in the provided data.

Q: What is the operating temperature range difference between the main part and substitutes?

A: MMXZ5251B-TP operates from -55°C to 150°C. All substitute parts extend the lower temperature limit to -65°C, providing improved performance in cold environment applications.

Q: Which substitute part has the lowest reverse leakage current?

A: MM3Z22VB exhibits the lowest reverse leakage current at 45 nA @ 15.4 V, followed by BZX84J-B22,115 at 50 nA @ 15.4 V and DDZ9708S-7 at 50 nA @ 16.7 V. The main part MMXZ5251B-TP specifies 100 nA @ 17 V.

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