MM3Z51VC Equivalent & Substitute Parts

Part Overview

The MM3Z51VC is an active-status zener diode manufactured by onsemi, rated at 51 V nominal zener voltage with 200 mW maximum power dissipation in a surface mount SOD-323F package. This component is designed for voltage regulation and protection applications requiring precise voltage reference characteristics. Equivalent and substitute parts are identified based on matching or exceeding electrical performance parameters while maintaining compatibility with the SOD-323F footprint or functionally equivalent packages. Substitutes are necessary when the primary part is unavailable, when design requirements permit higher power ratings, or when alternative tolerance specifications are acceptable.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	51	V
Tolerance	±5%	-
Power - Max	200	mW
Impedance (Max)	169	Ohms
Current - Reverse Leakage @ Vr	45 nA @ 35.7 V	-
Voltage - Forward (Vf) (Max) @ If	1 V @ 10 mA	-
Operating Temperature	-65°C ~ 150°C	-
Package / Case	SOD-323F	-
Mounting Type	Surface Mount	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution logic for the MM3Z51VC is based on the following critical parameters:

Primary Matching Criteria:

Voltage - Zener (Nom): 51 V (exact match required)
Mounting Type: Surface Mount
Operating Temperature Range: -65°C ~ 150°C (minimum)
RoHS3 Compliance: Required

Secondary Compatibility Criteria:

Power - Max: Equal to or greater than 200 mW
Package / Case: SOD-323F (preferred) or functionally equivalent surface mount packages
Tolerance: ±5% or tighter acceptable
Impedance (Max): 169 Ohms or lower acceptable

Substitute parts are classified into two categories:

Parametric Equivalents: Parts with identical zener voltage, power rating, and package, differing only in tolerance specification.

Similar Substitutes: Parts with identical zener voltage and surface mount configuration but with different power ratings, packages, or impedance characteristics. These substitutes are suitable when circuit design permits higher power dissipation capability or when package footprint alternatives are acceptable.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Impedance (Max)	Package	Vf (Max) @ If	RoHS Status
MM3Z51VC	onsemi	51 V	±5%	200 mW	169 Ohms	SOD-323F	1 V @ 10 mA	ROHS3 Compliant
MM3Z51VB	onsemi	51 V	±2%	200 mW	169 Ohms	SOD-323F	1 V @ 10 mA	ROHS3 Compliant
BZT52H-C51,115	Nexperia USA Inc.	51 V	±5%	375 mW	100 Ohms	SOD-123F	900 mV @ 10 mA	ROHS3 Compliant
BZX585-C51,115	Nexperia USA Inc.	51 V	±5%	300 mW	180 Ohms	SOD-523	1.1 V @ 100 mA	ROHS3 Compliant
BZX84J-C51,115	Nexperia USA Inc.	51 V	±5%	550 mW	110 Ohms	SOD-323F	1.1 V @ 100 mA	ROHS3 Compliant
UDZLVTE-1751	Rohm Semiconductor	51 V	-	200 mW	-	SOD-323F	-	ROHS3 Compliant

Engineering Selection Recommendations

MM3Z51VB (onsemi): Direct parametric equivalent with tighter tolerance specification (±2% versus ±5%). Identical power rating, impedance, and SOD-323F package. Suitable for applications requiring improved voltage accuracy. Product status is active with 3200 units in stock.

BZX84J-C51,115 (Nexperia USA Inc.): Functionally compatible substitute with identical SOD-323F package and zener voltage. Provides 550 mW power rating (2.75× the MM3Z51VC rating) with lower impedance (110 Ohms). Maintains ±5% tolerance and -65°C ~ 150°C operating range. Qualified to AEC-Q101 automotive standard. Suitable for applications where higher power dissipation capability is beneficial or required. Product status is active with 3686 units in stock.

BZX585-C51,115 (Nexperia USA Inc.): Functionally compatible substitute with 51 V zener voltage and 300 mW power rating. Packaged in SOD-523 (SC-79) surface mount case. Lower impedance (180 Ohms) and qualified to AEC-Q100 automotive standard. Suitable when SOD-523 package footprint is acceptable. Product status is active with 9460 units in stock.

BZT52H-C51,115 (Nexperia USA Inc.): Functionally compatible substitute with 51 V zener voltage and 375 mW power rating. Packaged in SOD-123F surface mount case. Lower impedance (100 Ohms) and qualified to AEC-Q101 automotive standard. Suitable when SOD-123F package footprint is acceptable and higher power dissipation is required. Product status is active with 4069 units in stock.

UDZLVTE-1751 (Rohm Semiconductor): Functionally compatible substitute with 51 V zener voltage and 200 mW power rating in SOD-323F package. Tolerance specification not provided in available data. Suitable as alternative source when onsemi parts are unavailable. Product status is active with 2411 units in stock.

Frequently Asked Questions (FAQ)

Q: Can MM3Z51VB replace MM3Z51VC directly?

A: Yes. MM3Z51VB is a parametric equivalent with identical electrical specifications except for tighter tolerance (±2% versus ±5%). Both parts share the same 51 V zener voltage, 200 mW power rating, 169 Ohms impedance, and SOD-323F package. Direct substitution is valid for all applications.

Q: What is the difference between MM3Z51VC and BZX84J-C51,115?

A: Both parts maintain 51 V zener voltage and SOD-323F package compatibility. BZX84J-C51,115 provides higher power dissipation (550 mW versus 200 mW) and lower impedance (110 Ohms versus 169 Ohms). BZX84J-C51,115 is qualified to AEC-Q101 automotive standard. Substitution is valid when higher power capability is acceptable or beneficial.

Q: Can I use BZT52H-C51,115 in place of MM3Z51VC?

A: Electrical substitution is valid based on matching 51 V zener voltage and ±5% tolerance. However, BZT52H-C51,115 uses SOD-123F package instead of SOD-323F. PCB layout and footprint compatibility must be verified before substitution. BZT52H-C51,115 provides higher power rating (375 mW) and lower impedance (100 Ohms).

Q: What is the advantage of BZX585-C51,115 over MM3Z51VC?

A: BZX585-C51,115 maintains 51 V zener voltage with increased power rating (300 mW versus 200 mW). It uses SOD-523 package instead of SOD-323F and is qualified to AEC-Q100 automotive standard. Substitution is valid when SOD-523 footprint is acceptable and higher power dissipation is required.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts (MM3Z51VB, BZT52H-C51,115, BZX585-C51,115, BZX84J-C51,115, and UDZLVTE-1751) are ROHS3 compliant, matching the compliance status of MM3Z51VC.

Q: Which substitute part has the lowest impedance?

A: BZT52H-C51,115 has the lowest impedance at 100 Ohms, compared to MM3Z51VC at 169 Ohms. Lower impedance provides better voltage regulation characteristics in certain circuit topologies.

Q: Can UDZLVTE-1751 be used as a direct replacement?

A: UDZLVTE-1751 maintains 51 V zener voltage and 200 mW power rating in SOD-323F package, enabling direct substitution. Tolerance specification is not provided in available documentation. Verify tolerance requirements for your specific application before substitution.

Q: What is the operating temperature range for all substitute parts?

A: All substitute parts maintain the -65°C ~ 150°C operating temperature range specified for MM3Z51VC, ensuring thermal compatibility across applications.

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