DZ2S043M0L Zener Diode Equivalent & Substitute Parts

Part Overview

The DZ2S043M0L is a 4.31 V, 150 mW surface mount zener diode manufactured by Panasonic Electronic Components in the SSMini2-F5-B package. This component is classified as discontinued at DiGi Electronics, necessitating identification of equivalent and substitute parts for ongoing design requirements and production needs. The part operates across a temperature range of -40°C to 85°C and maintains RoHS compliance with unlimited moisture sensitivity rating.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	4.31	V
Tolerance	±2.5%	-
Power - Max	150	mW
Impedance (Max)	130	Ohms
Current - Reverse Leakage @ Vr	10	µA @ 1 V
Voltage - Forward (Vf) (Max) @ If	1	V @ 10 mA
Operating Temperature	-40 to 85	°C
Mounting Type	Surface Mount	-
Package / Case	SC-79, SOD-523	-
RoHS Status	RoHS Compliant	-

Substitute Part Grouping Explanation

Substitution of the DZ2S043M0L is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage nominal value within 4.3 V to 4.31 V range
Package compatibility: SC-79 or SOD-523 surface mount packages
Power dissipation rating of 150 mW or greater
Tolerance specification of ±2.5% or tighter
Operating temperature range encompassing -40°C to 85°C minimum
Surface mount mounting type
RoHS compliance status

Secondary Compatibility Factors:

Impedance (Zzt) maximum rating
Reverse leakage current specifications
Forward voltage characteristics
Moisture sensitivity level (MSL 1 acceptable)

Substitute parts are grouped based on power rating capability and tolerance specifications. Parts with higher power ratings (300 mW, 350 mW, 500 mW) are direct functional substitutes when zener voltage and package specifications align. Tolerance variations (±2%, ±3%, ±5%, ±7%) are noted as they affect circuit precision requirements.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Leakage @ 1V	Vf (Max)	Temp Range	Package	Status
DZ2S043M0L	Panasonic	4.31 V	±2.5%	150 mW	130 Ω	10 µA	1 V @ 10 mA	-40 to 85°C	SOD-523	Discontinued
BZT585B4V3T-7	Diodes Inc.	4.3 V	±2%	350 mW	150 Ω	3 µA	1.1 V @ 100 mA	-65 to 150°C	SOD-523	Active
BZX585-B4V3,115	Nexperia	4.3 V	±2%	300 mW	90 Ω	3 µA	1.1 V @ 100 mA	-65 to 150°C	SOD-523	Active
BZX585-B4V3,135	Nexperia	4.3 V	±2%	300 mW	90 Ω	3 µA	1.1 V @ 100 mA	-65 to 150°C	SOD-523	Active
BZX585-C4V3,115	Nexperia	4.3 V	±5%	300 mW	90 Ω	3 µA	1.1 V @ 100 mA	-65 to 150°C	SOD-523	Active
BZX585-C4V3,135	Nexperia	4.3 V	±5%	300 mW	90 Ω	3 µA	1.1 V @ 100 mA	-65 to 150°C	SOD-523	Active
EDZVFHT2R4.3B	Rohm	4.3 V	±3.02%	150 mW	100 Ω	5 µA	-	-55 to 150°C	SOD-523	Active
EDZVT2R4.3B	Rohm	4.3 V	±3%	150 mW	100 Ω	5 µA	-	-55 to 150°C	SOD-523	Active
SZMM5Z4V3T1G	onsemi	4.3 V	±7%	500 mW	90 Ω	3 µA	900 mV @ 10 mA	-65 to 150°C	SOD-523	Active

Engineering Selection Recommendations

Tier 1 - Direct Substitutes (Recommended for Primary Selection):

The EDZVT2R4.3B and EDZVFHT2R4.3B from Rohm Semiconductor provide the closest functional equivalence to the DZ2S043M0L. Both maintain the 150 mW power rating, operate within compatible temperature ranges, and are available in the SOD-523 package. The EDZVT2R4.3B offers ±3% tolerance with operating range of -55°C to 150°C and is actively produced. The EDZVFHT2R4.3B provides automotive-grade qualification (AEC-Q101) with ±3.02% tolerance and maximum junction temperature of 150°C.

Tier 2 - Higher Power Substitutes (For Designs Requiring Increased Thermal Margin):

The BZX585-B4V3,115 and BZX585-B4V3,135 from Nexperia USA Inc. provide 300 mW power dissipation with ±2% tolerance, superior to the original ±2.5% specification. Both are automotive-qualified (AEC-Q100) and actively produced. The extended operating range of -65°C to 150°C exceeds the original -40°C to 85°C requirement. These parts are suitable for applications requiring tighter voltage tolerance and enhanced thermal performance.

Tier 3 - Maximum Power Capability:

The BZT585B4V3T-7 from Diodes Incorporated and SZMM5Z4V3T1G from onsemi offer 350 mW and 500 mW power ratings respectively. The BZT585B4V3T-7 provides ±2% tolerance with -65°C to 150°C operating range. The SZMM5Z4V3T1G is automotive-qualified (AEC-Q101) with 500 mW capability and ±7% tolerance. These options are appropriate for designs with significant thermal stress or future power margin requirements.

Tolerance Consideration:

The BZX585-C4V3,115 and BZX585-C4V3,135 from Nexperia feature ±5% tolerance, which is wider than the original ±2.5% specification. These parts are suitable only for applications where voltage tolerance is not a critical design parameter.

All recommended substitutes maintain RoHS3 compliance, REACH unaffected status, and MSL 1 moisture sensitivity rating. All parts are available in SOD-523 package format compatible with existing PCB layouts.

Frequently Asked Questions (FAQ)

Q: Can the DZ2S043M0L be directly replaced with any of the listed substitutes?

A: Direct replacement depends on circuit tolerance requirements. The EDZVT2R4.3B and EDZVFHT2R4.3B from Rohm maintain identical 150 mW power ratings and similar tolerance specifications (±3% and ±3.02% respectively). Higher power-rated substitutes (300 mW, 350 mW, 500 mW) are functionally compatible but provide additional thermal margin. Tolerance-critical applications should prioritize BZT585B4V3T-7 (±2%) or Nexperia BZX585-B4V3 series (±2%) over wider tolerance options.

Q: Are all substitute parts available in the same package?

A: Yes. All listed substitute parts are available in the SOD-523 package (also designated SC-79), which is mechanically and electrically compatible with existing PCB designs for the DZ2S043M0L. No layout modifications are required for package compatibility.

Q: What is the significance of the different power ratings among substitutes?

A: Power rating indicates maximum continuous power dissipation capability. The original DZ2S043M0L is rated at 150 mW. Substitutes with 300 mW, 350 mW, or 500 mW ratings provide additional thermal headroom and can operate at higher current levels without exceeding junction temperature limits. Selection should be based on actual circuit power dissipation requirements, not maximum ratings alone.

Q: How do tolerance specifications affect part selection?

A: Tolerance defines the allowable deviation from nominal zener voltage. The original part specifies ±2.5%. Substitutes with ±2% tolerance (BZT585B4V3T-7, BZX585-B4V3 series) provide tighter voltage regulation. Parts with ±5% or ±7% tolerance (BZX585-C4V3 series, SZMM5Z4V3T1G) are suitable only for applications where voltage precision is not critical. Voltage-sensitive circuits should not use wider tolerance substitutes.

Q: What is the difference between automotive-qualified and standard parts?

A: Automotive-qualified parts (AEC-Q100, AEC-Q101) undergo additional qualification testing for reliability in automotive environments. The BZX585-B4V3 series (AEC-Q100), EDZVFHT2R4.3B (AEC-Q101), and SZMM5Z4V3T1G (AEC-Q101) meet these standards. Non-automotive parts like BZT585B4V3T-7 and EDZVT2R4.3B are suitable for general industrial and consumer applications.

Q: Can I use a substitute with a wider operating temperature range?

A: Yes. The original DZ2S043M0L operates from -40°C to 85°C. All listed substitutes maintain this range or exceed it (typically -55°C to 150°C or -65°C to 150°C). Wider temperature ranges provide additional design margin and are directly compatible with the original specification.

Q: What inventory considerations should influence part selection?

A: Current inventory levels vary significantly among substitutes. SZMM5Z4V3T1G (21,193 pcs), BZX585-C4V3,135 (20,950 pcs), and EDZVT2R4.3B (18,665 pcs) offer substantial stock availability. BZX585-B4V3,135 (1,094 pcs) and BZX585-B4V3,115 (3,894 pcs) have more limited availability. Inventory status should be verified at time of procurement.

Q: Are all substitutes RoHS compliant?

A: Yes. All listed substitute parts carry RoHS3 compliance status and REACH unaffected designation, matching the original DZ2S043M0L RoHS compliance requirement.

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