MMSZ5259B-HE3-08 Equivalent & Substitute Parts

Part Overview

The MMSZ5259B-HE3-08 is a 39 V, 500 mW Zener diode in SOD-123 surface mount package manufactured by Vishay General Semiconductor - Diodes Division. This part is classified as Obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and procurement. The device is qualified to AEC-Q101 automotive standards and complies with ROHS3 and REACH requirements. Equivalent parts maintain identical electrical specifications while offering active product status and improved availability.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	39	V
Tolerance	±5%	—
Power - Maximum	500	mW
Impedance (Maximum)	80	Ohms
Current - Reverse Leakage @ Vr	100 nA @ 30 V	—
Operating Temperature Range	-55°C to 150°C	—
Package / Case	SOD-123	—
Mounting Type	Surface Mount	—
Grade	Automotive	—
Qualification	AEC-Q101	—

Substitute Part Grouping Explanation

Substitution of the MMSZ5259B-HE3-08 is determined by strict equivalence across the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - Zener (Nominal): 39 V
Power - Maximum: 500 mW
Package / Case: SOD-123
Mounting Type: Surface Mount
Impedance (Maximum): 80 Ohms
Current - Reverse Leakage @ Vr: 100 nA @ 30 V

Tolerance Variations: Parts with ±5% tolerance are direct equivalents. Parts with ±2% tolerance (MMSZ5259C series) represent tighter tolerance variants and are functionally compatible for applications requiring higher precision.

Packaging Variants: The main part is supplied in Cut Tape (CT) & Digi-Reel® format. Substitute parts are available in Tape & Reel (TR) format, which is mechanically and electrically equivalent for surface mount assembly.

Manufacturer Variants: Vishay MMSZ5259B and MMSZ5259C series parts are direct substitutes. The BZT52C39-13-F from Diodes Incorporated meets all electrical specifications with minor impedance variation (130 Ohms maximum versus 80 Ohms) and extended operating temperature range (-65°C to 150°C).

Parameter Comparison

Part Number	Manufacturer	Status	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Ir @ Vr	Temp Range (°C)	Package	Inventory (Pcs)
MMSZ5259B-HE3-08	Vishay	Obsolete	39	±5%	500	80	100 nA @ 30 V	-55 to 150	SOD-123	6100
MMSZ5259B-HE3_A-08	Vishay	Active	39	±5%	500	80	100 nA @ 30 V	-55 to 150	SOD-123	741
MMSZ5259B-E3-08	Vishay	Active	39	±5%	500	80	100 nA @ 30 V	-55 to 150	SOD-123	15187
MMSZ5259B-E3-18	Vishay	Active	39	±5%	500	80	100 nA @ 30 V	-55 to 150	SOD-123	1117
MMSZ5259B-G3-08	Vishay	Active	39	±5%	500	80	100 nA @ 30 V	-55 to 150	SOD-123	1012
MMSZ5259B-G3-18	Vishay	Active	39	±5%	500	80	100 nA @ 30 V	-55 to 150	SOD-123	811
MMSZ5259C-E3-08	Vishay	Active	39	±2%	500	80	100 nA @ 30 V	-55 to 150	SOD-123	15411
MMSZ5259C-E3-18	Vishay	Active	39	±2%	500	80	100 nA @ 30 V	-55 to 150	SOD-123	747
MMSZ5259C-G3-08	Vishay	Active	39	±2%	500	80	100 nA @ 30 V	-55 to 150	SOD-123	1156
MMSZ5259C-G3-18	Vishay	Active	39	±2%	500	80	100 nA @ 30 V	-55 to 150	SOD-123	944
BZT52C39-13-F	Diodes Incorporated	Active	39	±5%	500	130	100 nA @ 27.3 V	-65 to 150	SOD-123	1113

Engineering Selection Recommendations

Vishay MMSZ5259B Series (±5% Tolerance): The MMSZ5259B-E3-08 and MMSZ5259B-G3-08 are recommended as primary substitutes for the obsolete MMSZ5259B-HE3-08. Both parts maintain identical electrical specifications, AEC-Q101 qualification, ROHS3 compliance, and REACH unaffected status. The MMSZ5259B-E3-08 offers the highest inventory availability (15,187 units) and is suitable for applications where the original ±5% tolerance specification is maintained.

Vishay MMSZ5259C Series (±2% Tolerance): The MMSZ5259C-E3-08 and MMSZ5259C-G3-08 provide tighter voltage tolerance (±2%) while maintaining all other electrical and mechanical parameters. These parts are appropriate for precision applications requiring improved voltage regulation accuracy. The MMSZ5259C-E3-08 provides the highest inventory level (15,411 units) within the tighter tolerance group.

Diodes Incorporated BZT52C39-13-F: This part is a cross-manufacturer equivalent meeting all core electrical specifications. The impedance specification is higher (130 Ohms maximum versus 80 Ohms), and the operating temperature range is extended (-65°C to 150°C). This part is suitable for applications requiring extended low-temperature operation. Both manufacturers' parts carry ROHS3 compliance and REACH unaffected status.

Packaging Format Selection: All substitute parts are supplied in Tape & Reel (TR) format, which is standard for high-volume surface mount assembly. The original part's Cut Tape (CT) & Digi-Reel® format is functionally equivalent for component placement and soldering operations.

Frequently Asked Questions (FAQ)

Q: Can MMSZ5259B-E3-08 directly replace MMSZ5259B-HE3-08?

A: Yes. Both parts share identical electrical specifications: 39 V nominal Zener voltage, ±5% tolerance, 500 mW power rating, 80 Ohms maximum impedance, and 100 nA reverse leakage current at 30 V. Both are AEC-Q101 qualified, ROHS3 compliant, and packaged in SOD-123. The primary difference is product status (Active versus Obsolete) and packaging format (Tape & Reel versus Cut Tape & Digi-Reel).

Q: What is the difference between MMSZ5259B and MMSZ5259C series?

A: The MMSZ5259C series provides tighter voltage tolerance (±2%) compared to the MMSZ5259B series (±5%). All other electrical parameters, including power rating, impedance, reverse leakage current, and operating temperature range, are identical. Selection between these series depends on application requirements for voltage regulation precision.

Q: Are the -E3 and -G3 variants interchangeable?

A: Yes. The -E3 and -G3 designations represent different packaging reel configurations within Tape & Reel format. Both variants maintain identical electrical specifications and are mechanically compatible for surface mount assembly. Selection between these variants is determined by procurement and assembly equipment compatibility.

Q: Can BZT52C39-13-F from Diodes Incorporated be used as a substitute?

A: Yes, with consideration of impedance specification. The BZT52C39-13-F meets all core electrical requirements: 39 V nominal voltage, ±5% tolerance, 500 mW power rating, and SOD-123 package. The impedance specification is higher (130 Ohms maximum versus 80 Ohms), and the operating temperature range is extended (-65°C to 150°C). This part is suitable for applications where these parameter variations are acceptable.

Q: What does the -08 and -18 designation indicate in part numbers?

A: These designations represent different tape reel specifications within the Tape & Reel (TR) packaging format. Both variants are electrically and mechanically equivalent. Selection is determined by procurement requirements and assembly equipment compatibility.

Q: Are all substitute parts automotive qualified?

A: Vishay MMSZ5259B and MMSZ5259C series parts carry AEC-Q101 automotive qualification. The Diodes Incorporated BZT52C39-13-F is also ROHS3 compliant and REACH unaffected. Confirm specific automotive qualification requirements with the component supplier for your application.

Q: What is the impact of higher impedance in the BZT52C39-13-F?

A: The BZT52C39-13-F impedance specification of 130 Ohms maximum (versus 80 Ohms for Vishay parts) affects dynamic impedance characteristics. This parameter influences voltage regulation under transient current conditions. Applications with stringent dynamic impedance requirements should maintain Vishay MMSZ5259 series selection.

Q: Can these parts be used interchangeably in existing designs?

A: Yes, provided the design accommodates the specified parameter ranges. All substitute parts maintain the 39 V nominal voltage, 500 mW power rating, and SOD-123 package. Designs using the original ±5% tolerance specification can use any MMSZ5259B variant. Designs requiring tighter tolerance can upgrade to MMSZ5259C series. The BZT52C39-13-F is suitable where impedance and temperature range variations are acceptable.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message