MMSZ5259C-HE3-08 Equivalent & Substitute Parts

Part Overview

The MMSZ5259C-HE3-08 is a Zener Diode rated at 39 V, 500 mW, with ±2% tolerance, manufactured by Vishay General Semiconductor - Diodes Division in SOD-123 surface mount package. This part is classified as Obsolete, necessitating identification of active equivalent and substitute components for ongoing design support and procurement. The part carries AEC-Q101 automotive qualification and ROHS3 compliance.

Key Parameters

Parameter	Value
Voltage - Zener (Nom)	39 V
Tolerance	±2%
Power - Max	500 mW
Impedance (Max)	80 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 30 V
Operating Temperature	-55°C ~ 150°C
Package / Case	SOD-123
Mounting Type	Surface Mount
Grade	Automotive
Qualification	AEC-Q101

Substitute Part Grouping Explanation

Substitution of the MMSZ5259C-HE3-08 is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 39 V nominal
Power dissipation: 500 mW or higher
Package type: SOD-123 (preferred for direct mechanical compatibility)
Impedance: 80 Ohms maximum
Reverse leakage current: 100 nA @ 30 V or lower
Operating temperature range: -55°C to 150°C minimum

Tolerance Consideration: The original part specifies ±2% tolerance. Substitutes with ±5% tolerance are functionally equivalent for most applications but represent a relaxed specification. Substitutes with ±2% tolerance maintain specification parity.

Packaging Variants: Substitutes are grouped by supplier device package (SOD-123 or SOD-323) and tape format (Tape & Reel or Cut Tape). SOD-323 packages represent a smaller form factor with reduced power rating (200 mW) and are suitable only where power dissipation requirements permit.

Product Status: All recommended substitutes carry Active product status, ensuring long-term availability and supply chain continuity.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Ir @ Vr	Temp Range	Package	Status
MMSZ5259C-HE3-08	Vishay	39 V	±2%	500 mW	80 Ω	100 nA @ 30 V	-55°C ~ 150°C	SOD-123	Obsolete
MMSZ5259C-HE3_A-08	Vishay	39 V	±2%	500 mW	80 Ω	100 nA @ 30 V	-55°C ~ 150°C	SOD-123	Active
MMSZ5259C-E3-08	Vishay	39 V	±2%	500 mW	80 Ω	100 nA @ 30 V	-55°C ~ 150°C	SOD-123	Active
MMSZ5259C-E3-18	Vishay	39 V	±2%	500 mW	80 Ω	100 nA @ 30 V	-55°C ~ 150°C	SOD-123	Active
MMSZ5259C-G3-08	Vishay	39 V	±2%	500 mW	80 Ω	100 nA @ 30 V	-55°C ~ 150°C	SOD-123	Active
MMSZ5259C-G3-18	Vishay	39 V	±2%	500 mW	80 Ω	100 nA @ 30 V	-55°C ~ 150°C	SOD-123	Active
CMHZ5259B TR PBFREE	Central Semiconductor	39 V	±5%	500 mW	80 Ω	100 nA @ 30 V	-65°C ~ 150°C	SOD-123	Active
MMSZ39T1G	onsemi	39 V	±5%	500 mW	130 Ω	50 nA @ 27.3 V	-55°C ~ 150°C	SOD-123	Active
MMSZ4716-TP	Micro Commercial Co	39 V	±5%	500 mW	Not specified	10 nA @ 29.6 V	-55°C ~ 150°C	SOD-123	Active
BZT52C39S-7-F	Diodes Incorporated	39 V	±5%	200 mW	130 Ω	100 nA @ 27.3 V	-65°C ~ 150°C	SOD-323	Active
MMSZ5259BS-7-F	Diodes Incorporated	39 V	±5%	200 mW	80 Ω	100 nA @ 30 V	-65°C ~ 150°C	SOD-323	Active

Engineering Selection Recommendations

Direct Replacement (Specification Parity):

MMSZ5259C-HE3_A-08, MMSZ5259C-E3-08, MMSZ5259C-E3-18, MMSZ5259C-G3-08, and MMSZ5259C-G3-18 are direct parametric equivalents to the obsolete MMSZ5259C-HE3-08. All maintain identical electrical specifications (39 V, ±2% tolerance, 500 mW, 80 Ω impedance) and SOD-123 packaging. All carry Active product status and AEC-Q101 automotive qualification. These parts are suitable for direct substitution without circuit redesign.

Functional Equivalents (Relaxed Tolerance):

CMHZ5259B TR PBFREE, MMSZ39T1G, and MMSZ4716-TP provide functional equivalence with ±5% tolerance specification. All maintain 39 V nominal voltage, 500 mW power rating, and SOD-123 package. These parts are suitable where tolerance relaxation is acceptable. CMHZ5259B TR PBFREE and MMSZ39T1G extend the operating temperature range to -65°C and -55°C respectively, providing enhanced low-temperature performance.

Reduced Power Alternatives (SOD-323 Package):

BZT52C39S-7-F and MMSZ5259BS-7-F are suitable only where power dissipation requirements do not exceed 200 mW. Both employ SOD-323 packaging, which is mechanically incompatible with SOD-123 footprints. These parts carry ±5% tolerance and extended temperature ranges (-65°C to 150°C). Selection of these alternatives requires PCB layout modification.

Compliance and Certification:

All recommended substitutes maintain ROHS3 compliance, REACH unaffected status, and EAR99 export classification. CMHZ5259B TR PBFREE carries automotive-grade qualification equivalent to the original part.

Frequently Asked Questions (FAQ)

Q: Can MMSZ5259C-E3-08 directly replace MMSZ5259C-HE3-08 without circuit modification?

A: Yes. MMSZ5259C-E3-08 is a parametric equivalent with identical electrical specifications (39 V, ±2%, 500 mW, 80 Ω) and SOD-123 packaging. No circuit or PCB layout changes are required.

Q: What is the difference between the Vishay variants (HE3_A-08, E3-08, E3-18, G3-08, G3-18)?

A: All Vishay variants maintain identical electrical parameters. The suffix designations (HE3_A, E3, G3) and packaging codes (-08, -18) represent different manufacturing batches, tape formats, or supplier packaging configurations. Electrical performance is equivalent across all variants.

Q: Can CMHZ5259B TR PBFREE be used as a direct substitute?

A: CMHZ5259B TR PBFREE is functionally equivalent with the same 39 V voltage, 500 mW power, and SOD-123 package. However, it carries ±5% tolerance versus the original ±2% tolerance. It is suitable for applications where tolerance relaxation is acceptable.

Q: Why are BZT52C39S-7-F and MMSZ5259BS-7-F listed as substitutes if they have lower power ratings?

A: These parts are listed as functional alternatives for applications where power dissipation does not exceed 200 mW. They maintain 39 V nominal voltage and are suitable for lower-power circuit implementations. However, they require PCB layout modification due to SOD-323 packaging incompatibility with SOD-123 footprints.

Q: Are all substitute parts automotive-qualified?

A: The Vishay variants (MMSZ5259C-HE3_A-08, E3-08, E3-18, G3-08, G3-18) and CMHZ5259B TR PBFREE carry AEC-Q101 automotive qualification. MMSZ39T1G, MMSZ4716-TP, BZT52C39S-7-F, and MMSZ5259BS-7-F do not specify automotive qualification in the provided data.

Q: What is the inventory status of recommended substitutes?

A: MMSZ5259C-E3-08 has the highest inventory (15,411 pcs). MMSZ39T1G (41,100 pcs) and BZT52C39S-7-F (167,100 pcs) offer substantial stock availability. All recommended substitutes are listed as Active products with current manufacturing support.

Q: Can MMSZ39T1G be used in place of MMSZ5259C-HE3-08?

A: MMSZ39T1G is functionally equivalent with 39 V nominal voltage, 500 mW power, and SOD-123 package. It carries ±5% tolerance and 130 Ω impedance versus the original 80 Ω. It is suitable for applications where impedance variation and tolerance relaxation are acceptable.

Q: What are the key differences between SOD-123 and SOD-323 packages?

A: SOD-123 and SOD-323 are physically distinct surface mount packages with different footprints. SOD-323 is a smaller form factor. Substitution between these packages requires PCB layout redesign. The original MMSZ5259C-HE3-08 uses SOD-123; direct mechanical compatibility is maintained only with other SOD-123 packaged parts.

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