MMSZ5259B-HE3-18 Equivalent & Substitute Parts

Part Overview

The MMSZ5259B-HE3-18 is a 39 V Zener diode rated at 500 mW in SOD-123 surface mount packaging, manufactured by Vishay General Semiconductor - Diodes Division. This component is classified as Obsolete, indicating that direct procurement from original inventory may become limited. The part carries Automotive grade qualification (AEC-Q101) and is ROHS3 compliant, making it suitable for automotive and industrial applications requiring voltage regulation and transient protection.

Identification of equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain flexibility, and support long-term product availability. Active alternatives with identical or superior electrical characteristics are available within the MMSZ5259 series.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution of the MMSZ5259B-HE3-18 is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 39 V (fixed across all alternatives)
Power rating: 500 mW (fixed across all alternatives)
Package: SOD-123 (fixed across all alternatives)
Impedance: 80 Ohms maximum (fixed across all alternatives)
Reverse leakage current: 100 nA @ 30 V (fixed across all alternatives)
Operating temperature range: -55°C to 150°C (required for full compatibility)

Secondary Differentiation Parameters:

Tolerance: ±5% (MMSZ5259B series) or ±2% (MMSZ5259C series)
Packaging format: Tape & Reel (TR), Cut Tape (CT) & Digi-Reel®
Product status: Active or Obsolete
Automotive qualification: AEC-Q101 certified

Substitute parts are grouped into two tolerance classes. The MMSZ5259B-HE3-18 operates with ±5% tolerance. Direct parametric equivalents maintain identical tolerance. The MMSZ5259C series offers tighter ±2% tolerance and represents an upgrade path for applications requiring improved voltage accuracy.

Parameter Comparison

Part Number	Vz (V)	Tolerance	Power (mW)	Zzt (Ω)	Ir @ 30V (nA)	Temp Range (°C)	Package	Status	AEC-Q101
MMSZ5259B-HE3-18	39	±5%	500	80	100	-55 to 150	SOD-123	Obsolete	Yes
MMSZ5259B-HE3_A-18	39	±5%	500	80	100	-55 to 150	SOD-123	Active	Yes
MMSZ5259B-E3-08	39	±5%	500	80	100	-55 to 150	SOD-123	Active	No
MMSZ5259B-E3-18	39	±5%	500	80	100	-55 to 150	SOD-123	Active	No
MMSZ5259B-G3-08	39	±5%	500	80	100	-55 to 150	SOD-123	Active	No
MMSZ5259B-G3-18	39	±5%	500	80	100	-55 to 150	SOD-123	Active	No
MMSZ5259B-HE3-08	39	±5%	500	80	100	-55 to 150	SOD-123	Obsolete	Yes
MMSZ5259C-E3-08	39	±2%	500	80	100	-55 to 150	SOD-123	Active	No
MMSZ5259C-E3-18	39	±2%	500	80	100	-55 to 150	SOD-123	Active	No
MMSZ5259C-G3-08	39	±2%	500	80	100	-55 to 150	SOD-123	Active	No
MMSZ5259C-G3-18	39	±2%	500	80	100	-55 to 150	SOD-123	Active	No

Engineering Selection Recommendations

Primary Recommendation: MMSZ5259B-HE3_A-18

The MMSZ5259B-HE3_A-18 is the manufacturer-recommended direct replacement. It maintains identical electrical specifications, tolerance, and operating temperature range as the original MMSZ5259B-HE3-18. The part is Active status, ensuring long-term availability. It carries Automotive grade qualification and AEC-Q101 certification, meeting the same compliance requirements as the original component. Packaging is Tape & Reel (TR) format.

Secondary Recommendations (Active Status, ±5% Tolerance):

The MMSZ5259B-E3-18 and MMSZ5259B-G3-18 are parametric equivalents with identical electrical characteristics and full operating temperature range. Both are Active status. These parts differ in packaging format (Tape & Reel) and do not carry explicit AEC-Q101 certification in the provided data, though they maintain Automotive grade classification.

The MMSZ5259B-E3-08 and MMSZ5259B-G3-08 are functionally equivalent but supplied in Cut Tape format, suitable for applications where reel quantities are not required.

Upgrade Path (Active Status, ±2% Tolerance):

The MMSZ5259C series (MMSZ5259C-E3-08, MMSZ5259C-E3-18, MMSZ5259C-G3-08, MMSZ5259C-G3-18) offers tighter voltage tolerance of ±2% while maintaining all other electrical parameters. These parts are Active status and suitable for applications requiring improved voltage regulation accuracy. Automotive grade is maintained across all MMSZ5259C variants.

Obsolete Alternatives (Not Recommended for New Designs):

The MMSZ5259B-HE3-08 remains Obsolete status and should not be selected for new designs despite carrying AEC-Q101 certification.

Frequently Asked Questions (FAQ)

Q: Can MMSZ5259B-HE3-18 be replaced with MMSZ5259C series parts?

A: Yes. The MMSZ5259C series maintains identical zener voltage (39 V), power rating (500 mW), impedance (80 Ohms), and operating temperature range (-55°C to 150°C). The MMSZ5259C series offers improved voltage tolerance of ±2% compared to the ±5% tolerance of the MMSZ5259B series. This represents a direct upgrade path with no electrical incompatibility.

Q: What is the difference between packaging codes E3, G3, and HE3?

A: The packaging codes designate different tape and reel specifications or cut tape formats. E3 and G3 indicate Tape & Reel (TR) packaging with different reel configurations. HE3 indicates Cut Tape (CT) & Digi-Reel® format. All three packaging types contain identical diode components and are electrically interchangeable. Selection depends on procurement and assembly requirements.

Q: Does the -08 or -18 suffix affect electrical performance?

A: No. The -08 and -18 suffixes designate different tape widths or reel specifications (8 mm or 18 mm tape). Electrical performance is identical. Selection is based on assembly equipment compatibility and procurement preferences.

Q: Is AEC-Q101 certification required for my application?

A: AEC-Q101 certification is mandatory for automotive applications. The MMSZ5259B-HE3_A-18 and MMSZ5259B-HE3-08 carry explicit AEC-Q101 qualification. If your application requires automotive qualification, select from these certified variants or confirm AEC-Q101 status with the manufacturer for other part numbers.

Q: Can I use MMSZ5259B-E3-18 as a direct replacement?

A: The MMSZ5259B-E3-18 is a parametric equivalent with identical electrical specifications and full operating temperature range (-55°C to 150°C). It is Active status with good inventory availability. However, it does not carry explicit AEC-Q101 certification in the provided specifications. For automotive applications requiring AEC-Q101, use MMSZ5259B-HE3_A-18 instead.

Q: What is the inventory status for each substitute?

A: MMSZ5259B-HE3_A-18 has 1001 pcs available. MMSZ5259B-E3-08 has 15187 pcs available. MMSZ5259B-E3-18 has 1117 pcs available. MMSZ5259B-G3-08 has 1012 pcs available. MMSZ5259B-G3-18 has 811 pcs available. MMSZ5259C-E3-08 has 15411 pcs available. MMSZ5259C-E3-18 has 747 pcs available. MMSZ5259C-G3-08 has 1156 pcs available. MMSZ5259C-G3-18 has 944 pcs available.

Q: Are all substitute parts ROHS3 compliant?

A: All substitute parts listed are ROHS3 compliant and REACH unaffected, matching the compliance status of the original MMSZ5259B-HE3-18.

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