MMSZ5259C-E3-18 Equivalent & Substitute Parts

Part Overview

The MMSZ5259C-E3-18 is a surface-mount Zener diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 39 V nominal Zener voltage with 500 mW maximum power dissipation in SOD-123 packaging. This component is classified as Active product status and is ROHS3 compliant. Equivalent and substitute parts are identified when component availability is limited, supply chain disruptions occur, or design flexibility permits selection from qualified alternatives that maintain electrical and mechanical compatibility within specified parameter tolerances.

Key Parameters

Parameter	Value	Unit
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 Range	-55 to 150	°C
Mounting Type	Surface Mount	-
Package / Case	SOD-123	-
RoHS Status	ROHS3 Compliant	-
Moisture Sensitivity Level	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitution eligibility for the MMSZ5259C-E3-18 is determined by the following critical parameters:

Primary Matching Criteria:

Zener voltage nominal rating: 39 V
Maximum power dissipation: 500 mW
Package type: SOD-123 surface mount
Mounting configuration: Surface Mount

Secondary Compatibility Parameters:

Operating temperature range: -55°C to 150°C minimum
RoHS compliance: ROHS3 Compliant
Moisture sensitivity level: 1 (Unlimited)

Substitute parts are grouped into two categories:

Parametric Equivalent: Parts that match all primary and secondary parameters with identical or tighter tolerance specifications. The MMSZ5259C-E3-08 qualifies as a parametric equivalent, differing only in packaging designation (reel size) while maintaining identical electrical characteristics.

Manufacturer Recommended Alternatives: Parts that satisfy primary matching criteria but may exhibit variations in tolerance, impedance, or temperature range. The CMHZ5259B TR PBFREE (Central Semiconductor Corp) and SZMMSZ39T1G (onsemi) are manufacturer-recommended alternatives that maintain 39 V Zener voltage and 500 mW power rating in SOD-123 packaging while accepting tolerance and impedance variations within acceptable engineering margins.

Parameter Comparison

Parameter	MMSZ5259C-E3-18 (Main)	MMSZ5259C-E3-08 (Parametric Equivalent)	CMHZ5259B TR PBFREE (MFR Recommended)	SZMMSZ39T1G (MFR Recommended)
Manufacturer	Vishay General Semiconductor	Vishay General Semiconductor	Central Semiconductor Corp	onsemi
Voltage - Zener (Nom)	39 V	39 V	39 V	39 V
Tolerance	±2%	±2%	±5%	±5%
Power - Max	500 mW	500 mW	500 mW	500 mW
Impedance (Max)	80 Ohms	80 Ohms	80 Ohms	130 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 30 V	100 nA @ 30 V	100 nA @ 30 V	50 nA @ 27.3 V
Operating Temperature	-55 to 150°C	-55 to 150°C	-65 to 150°C	-55 to 150°C
Package / Case	SOD-123	SOD-123	SOD-123	SOD-123
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active	Active

Engineering Selection Recommendations

MMSZ5259C-E3-08 Selection Criteria: The MMSZ5259C-E3-08 is a direct parametric equivalent to the MMSZ5259C-E3-18, manufactured by the same supplier (Vishay General Semiconductor - Diodes Division) with identical electrical specifications. The designation difference (-E3-08 versus -E3-18) reflects packaging reel configuration only. This substitute is appropriate for applications where component availability of the primary part number is constrained. Both parts maintain ±2% tolerance, 80 Ohms maximum impedance, and identical operating temperature range. ROHS3 compliance and MSL 1 rating are maintained.

CMHZ5259B TR PBFREE Selection Criteria: The CMHZ5259B TR PBFREE (Central Semiconductor Corp) is a manufacturer-recommended alternative suitable for applications where tolerance relaxation from ±2% to ±5% is acceptable. This part maintains 39 V Zener voltage, 500 mW power rating, and SOD-123 packaging. The extended operating temperature range (-65°C to 150°C) provides additional thermal margin. ROHS3 compliance and MSL 1 rating are maintained. Selection of this substitute is appropriate when supply availability of Vishay parts is limited and tolerance specifications permit ±5% variation.

SZMMSZ39T1G Selection Criteria: The SZMMSZ39T1G (onsemi) is a manufacturer-recommended alternative qualified to AEC-Q101 automotive standard. This part is suitable for applications requiring automotive-grade components or where automotive supply chain qualification is mandated. The part maintains 39 V Zener voltage and 500 mW power rating in SOD-123 packaging. Impedance specification is 130 Ohms (higher than the main part), and reverse leakage is 50 nA @ 27.3 V (lower than the main part). Tolerance is ±5%. ROHS3 compliance and MSL 1 rating are maintained. Selection of this substitute is appropriate for automotive applications or when AEC-Q101 qualification is required.

Frequently Asked Questions (FAQ)

Q: Can MMSZ5259C-E3-08 be used as a direct replacement for MMSZ5259C-E3-18?

A: Yes. The MMSZ5259C-E3-08 is a parametric equivalent manufactured by Vishay General Semiconductor - Diodes Division with identical electrical specifications. The part number suffix difference (-E3-08 versus -E3-18) indicates packaging reel size only and does not affect electrical performance or compatibility. Both parts are rated 39 V, 500 mW, ±2% tolerance, and SOD-123 package.

Q: What is the tolerance difference between the main part and the manufacturer-recommended alternatives?

A: The MMSZ5259C-E3-18 and MMSZ5259C-E3-08 are specified at ±2% Zener voltage tolerance. The CMHZ5259B TR PBFREE and SZMMSZ39T1G are specified at ±5% tolerance. This means the main part and parametric equivalent maintain tighter voltage regulation, while the manufacturer-recommended alternatives permit greater voltage variation around the 39 V nominal rating.

Q: Are all substitute parts available in the same SOD-123 package?

A: Yes. All listed substitute parts (MMSZ5259C-E3-08, CMHZ5259B TR PBFREE, and SZMMSZ39T1G) are packaged in SOD-123 surface-mount configuration, ensuring mechanical and footprint compatibility with the MMSZ5259C-E3-18.

Q: What is the difference between the CMHZ5259B TR PBFREE and SZMMSZ39T1G?

A: Both parts are 39 V, 500 mW Zener diodes in SOD-123 packaging with ±5% tolerance. The CMHZ5259B TR PBFREE is manufactured by Central Semiconductor Corp with 80 Ohms maximum impedance and operating temperature range of -65°C to 150°C. The SZMMSZ39T1G is manufactured by onsemi with 130 Ohms maximum impedance, operating temperature range of -55°C to 150°C, and AEC-Q101 automotive qualification. Selection between these alternatives depends on impedance requirements and automotive qualification needs.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts (MMSZ5259C-E3-08, CMHZ5259B TR PBFREE, and SZMMSZ39T1G) are ROHS3 compliant and maintain MSL 1 (Unlimited) moisture sensitivity level, matching the compliance profile of the MMSZ5259C-E3-18.

Q: When should the SZMMSZ39T1G be selected over other alternatives?

A: The SZMMSZ39T1G should be selected when automotive-grade components are required or when AEC-Q101 qualification is mandated by design specifications or supply chain requirements. This part is suitable for automotive applications and provides lower reverse leakage current (50 nA @ 27.3 V) compared to the main part (100 nA @ 30 V).

Q: What is the impact of impedance variation between substitute parts?

A: The MMSZ5259C-E3-18 and MMSZ5259C-E3-08 specify 80 Ohms maximum impedance. The CMHZ5259B TR PBFREE also specifies 80 Ohms maximum impedance. The SZMMSZ39T1G specifies 130 Ohms maximum impedance. Higher impedance affects transient response and voltage regulation characteristics. Applications requiring precise impedance control should verify compatibility with the selected substitute before implementation.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message