MM5Z47VT1 Zener Diode Equivalent & Substitute Parts

Part Overview

The MM5Z47VT1 is a 47 V Zener diode manufactured by onsemi, rated for 100 mW maximum power dissipation in a surface mount SOD-523 package. This component is classified as obsolete, indicating that direct procurement from original inventory may become limited. Identifying equivalent and substitute parts ensures design continuity and supply chain reliability for applications requiring 47 V Zener regulation or protection functionality.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	47	V
Tolerance	±6%	%
Power - Max	100	mW
Impedance (Max)	170	Ohms
Current - Reverse Leakage @ Vr	50 nA @ 32.9 V	nA
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA	mV
Operating Temperature	-65 to 150	°C
Package / Case	SOD-523	—
Mounting Type	Surface Mount	—
RoHS Status	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitution of the MM5Z47VT1 is determined by the following critical parameters:

Voltage Matching: The Zener nominal voltage must be 47 V to maintain regulation characteristics in the circuit.

Power Rating: Substitute parts must have power dissipation ratings equal to or greater than 100 mW to handle the same thermal load.

Package Compatibility: The SOD-523 package footprint is the primary mechanical constraint. Substitutes in alternative packages (SOD-123F, SOD-323F) require PCB layout modification.

Tolerance: Voltage tolerance of ±6% or tighter ensures regulation accuracy within design specifications.

Reverse Leakage: Leakage current at 32.9 V must not exceed 50 nA to maintain circuit performance.

Temperature Range: Operating temperature range of -65°C to 150°C must be maintained.

Substitute parts are grouped into two categories:

Category 1 - Same Package (SOD-523): Direct mechanical and electrical substitutes requiring no PCB redesign.

Category 2 - Alternative Package: Higher power-rated alternatives in different packages (SOD-123F, SOD-323F) offering improved thermal performance but requiring layout modification.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Impedance (Max)	Reverse Leakage @ Vr	Package	Product Status	RoHS Status
MM5Z47VT1	onsemi	47 V	±6%	100 mW	170 Ω	50 nA @ 32.9 V	SOD-523	Obsolete	RoHS non-compliant
BZX585-B47,115	Nexperia USA Inc.	47 V	±2%	300 mW	170 Ω	50 nA @ 32.9 V	SOD-523	Active	ROHS3 Compliant
BZX585-C47,115	Nexperia USA Inc.	47 V	±5%	300 mW	170 Ω	50 nA @ 32.9 V	SOD-523	Active	ROHS3 Compliant
BZT52H-C47,115	Nexperia USA Inc.	47 V	±5%	375 mW	90 Ω	50 nA @ 32.9 V	SOD-123F	Active	ROHS3 Compliant
BZX84J-C47,115	Nexperia USA Inc.	47 V	±5%	550 mW	90 Ω	50 nA @ 32.9 V	SOD-323F	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (No PCB Modification):

BZX585-B47,115 and BZX585-C47,115 are the primary substitutes, both maintaining the SOD-523 package footprint. BZX585-B47,115 offers superior voltage tolerance (±2%) and is AEC-Q100 qualified for automotive applications. BZX585-C47,115 provides ±5% tolerance with identical package and electrical characteristics. Both parts are ROHS3 compliant and active in production, addressing the obsolescence status of the MM5Z47VT1.

For Enhanced Thermal Performance (PCB Modification Required):

BZT52H-C47,115 (SOD-123F package, 375 mW) and BZX84J-C47,115 (SOD-323F package, 550 mW) provide increased power dissipation capability. Both are AEC-Q101 qualified for automotive-grade applications and ROHS3 compliant. These alternatives are suitable for designs requiring higher power handling or improved thermal margins.

Compliance Considerations:

The MM5Z47VT1 is RoHS non-compliant. All recommended substitutes (BZX585 and BZT52H series from Nexperia) are ROHS3 compliant, supporting modern manufacturing and environmental requirements.

Frequently Asked Questions (FAQ)

Q: Can BZX585-B47,115 replace MM5Z47VT1 without circuit modification?

A: Yes. BZX585-B47,115 maintains identical SOD-523 package geometry, 47 V nominal voltage, and equivalent reverse leakage characteristics (50 nA @ 32.9 V). The increased power rating (300 mW vs. 100 mW) and improved tolerance (±2% vs. ±6%) provide enhanced performance without requiring circuit redesign.

Q: What is the difference between BZX585-B47,115 and BZX585-C47,115?

A: Both parts share the SOD-523 package and 300 mW power rating. BZX585-B47,115 specifies ±2% voltage tolerance, while BZX585-C47,115 specifies ±5%. Selection depends on regulation accuracy requirements. Both are AEC-Q100 qualified and ROHS3 compliant.

Q: Why would I select BZT52H-C47,115 or BZX84J-C47,115 over the SOD-523 alternatives?

A: These parts offer higher power dissipation (375 mW and 550 mW respectively) and lower impedance (90 Ω vs. 170 Ω), improving thermal performance and transient response. Selection requires PCB layout modification to accommodate different package footprints (SOD-123F and SOD-323F).

Q: Are all substitute parts automotive qualified?

A: BZX585-B47,115, BZX585-C47,115, BZT52H-C47,115, and BZX84J-C47,115 all carry automotive-grade qualifications (AEC-Q100 or AEC-Q101), suitable for automotive and industrial applications requiring enhanced reliability.

Q: What is the impact of switching from MM5Z47VT1 to a substitute part?

A: Electrical performance remains equivalent for 47 V regulation. Substitute parts offer improved RoHS compliance, active production status, and in most cases, enhanced specifications (higher power ratings, tighter tolerances, lower impedance). PCB layout changes are required only if selecting alternative package types.

Q: How does impedance affect Zener diode performance?

A: Impedance (Zzt) affects transient response and voltage regulation under dynamic load conditions. Lower impedance (90 Ω in BZT52H and BZX84J series) provides faster response to load changes compared to higher impedance (170 Ω in SOD-523 packages). Selection depends on circuit bandwidth requirements.

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