MM5Z43V Zener Diode 43V 200mW Equivalent & Substitute Parts

Part Overview

The MM5Z43V is a surface mount zener diode manufactured by onsemi, rated at 43 V nominal zener voltage with 200 mW maximum power dissipation in SOD-523F packaging. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for new designs and ongoing production requirements. The part operates across a temperature range of -55°C to 150°C with ±7% voltage tolerance and is suitable for voltage regulation and protection applications in compact form factors.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	43	V
Power - Max	200	mW
Tolerance	±7%	-
Impedance (Max)	150	Ohms
Current - Reverse Leakage @ Vr	50	nA @ 30.1 V
Operating Temperature	-55 to 150	°C
Mounting Type	Surface Mount	-
Package / Case	SOD-523F	-
Moisture Sensitivity Level	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitution of the MM5Z43V is determined by strict alignment of the following electrical and mechanical parameters:

Primary Substitution Criteria:

Zener voltage: 43 V nominal (determines circuit regulation point)
Mounting type: Surface mount (determines assembly compatibility)
Operating temperature range: Minimum -55°C to 150°C (determines thermal envelope)
Moisture sensitivity: MSL 1 (Unlimited) (determines storage and handling requirements)

Secondary Compatibility Parameters:

Power rating: Equal to or greater than 200 mW (determines thermal capability)
Impedance: Maximum 150 Ohms (determines dynamic response characteristics)
Reverse leakage current: Maximum 100 nA at specified voltage (determines standby performance)
Tolerance: ±7% or tighter (determines voltage accuracy)

Package Considerations: Substitutes are grouped by package type: SOD-523F (direct mechanical equivalent), SOD-523 (functionally equivalent, minor footprint variation), SOD-123F, SOD-123, and SOD-323F (larger packages with increased power capability). Package selection depends on circuit board layout constraints and thermal management requirements.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Ir @ Vr (nA)	Temp Range (°C)	Package	Status
MM5Z43V	onsemi	43	±7%	200	150	50 @ 30.1V	-55 to 150	SOD-523F	Obsolete
BZX584C43_R1_00001	Panjit International Inc.	43	±5%	200	150	100 @ 30.1V	-55 to 150	SOD-523	Active
BZX585-B43,115	NXP Semiconductors	43	±2%	300	150	50 @ 30.1V	-65 to 150	SOD-523	Active
BZX585-C43,115	Nexperia USA Inc.	43	±5%	300	150	50 @ 30.1V	-65 to 150	SOD-523	Active
BZT52H-C43,115	Nexperia USA Inc.	43	±5%	375	80	50 @ 30.1V	-65 to 150	SOD-123F	Active
BZX84J-C43,115	Nexperia USA Inc.	43	±5%	550	80	50 @ 30.1V	-65 to 150	SOD-323F	Active
BZX84J-B43,115	Nexperia USA Inc.	43	±2%	550	80	50 @ 30.1V	-65 to 150	SOD-323F	Active
MMSZ5260BT1G	onsemi	43	±5%	500	93	100 @ 33V	-55 to 150	SOD-123	Active

Engineering Selection Recommendations

Direct Equivalent (Same Package, Obsolete Replacement):

BZX584C43_R1_00001 provides the closest functional match to MM5Z43V. Both components share identical 43 V zener voltage, 200 mW power rating, 150 Ohm impedance, and SOD-523 package footprint. The Panjit part is active in production with RoHS3 compliance and tighter ±5% tolerance. Operating temperature range matches the original specification at -55°C to 150°C.

Higher Power Alternatives (SOD-523 Package):

BZX585-B43,115 and BZX585-C43,115 offer increased power dissipation (300 mW) within the same SOD-523 package envelope. Both are manufactured by NXP/Nexperia with active product status and AEC-Q100 automotive qualification. Extended temperature range to -65°C provides additional thermal margin. BZX585-B43,115 features ±2% tolerance; BZX585-C43,115 provides ±5% tolerance with AEC-Q100 certification.

Larger Package Options (Increased Power Capability):

BZT52H-C43,115 (SOD-123F, 375 mW) and BZX84J-C43,115 (SOD-323F, 550 mW) accommodate designs requiring higher power dissipation. Both are Nexperia products with AEC-Q101 automotive qualification and active status. These packages occupy larger board area but provide superior thermal performance and lower impedance (80 Ohms).

Alternative Manufacturer (onsemi):

MMSZ5260BT1G maintains onsemi manufacturing continuity with 500 mW power rating in SOD-123 package. Active product status with MMSZ52xxxT1G series designation. Impedance of 93 Ohms provides improved dynamic response compared to original 150 Ohm specification.

Compliance and Certification:

All active substitute parts carry RoHS3 compliance and REACH Unaffected status. Nexperia parts include automotive-grade qualification (AEC-Q100 or AEC-Q101) suitable for automotive and industrial applications. Selection should account for specific application requirements regarding temperature range extension and power dissipation capability.

Frequently Asked Questions (FAQ)

Q: Can BZX584C43_R1_00001 directly replace MM5Z43V without circuit modification?

A: Yes. Both components share 43 V zener voltage, 200 mW power rating, 150 Ohm impedance, and compatible SOD-523 package footprints. The Panjit part features tighter ±5% tolerance compared to the original ±7%, which improves voltage regulation accuracy. No circuit changes are required.

Q: What is the difference between SOD-523 and SOD-523F packages?

A: SOD-523F is a variant of SOD-523 with minor dimensional differences. Both packages are mechanically compatible for most applications. BZX584C43_R1_00001 uses SOD-523; MM5Z43V uses SOD-523F. Verify PCB footprint compatibility with your design documentation before substitution.

Q: Why would I select BZX585-C43,115 over BZX584C43_R1_00001?

A: BZX585-C43,115 provides 300 mW power rating versus 200 mW, offering 50% additional thermal margin. Extended temperature range to -65°C provides wider operating envelope. AEC-Q100 automotive qualification ensures production consistency. Select this part for applications requiring higher reliability or thermal headroom.

Q: Are the larger package options (SOD-123F, SOD-323F) pin-compatible with SOD-523F?

A: No. SOD-123F, SOD-123, and SOD-323F packages have different physical dimensions and footprints. These require PCB layout modifications. Select larger packages only when circuit board space permits and increased power dissipation is required.

Q: What does ±2% tolerance mean compared to ±7%?

A: Tolerance specifies the allowable deviation from nominal 43 V zener voltage. ±2% tolerance (BZX585-B43,115, BZX84J-B43,115) limits voltage variation to ±0.86 V. ±7% tolerance (MM5Z43V) allows ±3.01 V variation. Tighter tolerance improves voltage regulation accuracy in precision applications.

Q: Can I use MMSZ5260BT1G as a substitute despite the different package?

A: MMSZ5260BT1G (SOD-123) requires PCB redesign due to different footprint. However, it maintains onsemi manufacturing continuity and provides 500 mW power capability. Select this part only if board layout can accommodate SOD-123 package and increased power dissipation is beneficial.

Q: What is the significance of AEC-Q101 qualification?

A: AEC-Q101 is an automotive industry qualification standard for discrete semiconductors. Parts carrying this certification (BZT52H-C43,115, BZX84J-C43,115, BZX84J-B43,115) undergo rigorous testing for reliability, temperature cycling, and performance consistency. Select AEC-Q101 qualified parts for automotive and mission-critical applications.

Q: How does impedance (Zzt) affect circuit performance?

A: Impedance determines the zener diode's dynamic response to load current changes. Lower impedance (80 Ohms in BZT52H-C43,115 and BZX84J series) provides better voltage regulation under transient conditions. Higher impedance (150 Ohms in MM5Z43V and BZX584C43_R1_00001) is acceptable for stable load conditions. Select based on circuit transient response requirements.

Q: Is reverse leakage current critical for my application?

A: Reverse leakage current (Ir) determines standby power consumption and affects high-impedance circuit performance. MM5Z43V and BZX585 series specify 50 nA maximum; BZX584C43_R1_00001 and MMSZ5260BT1G specify 100 nA maximum. For low-power standby applications, select parts with 50 nA specification.

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