MMSZ5259BQ-13-F Equivalent & Substitute Parts

Part Overview

The MMSZ5259BQ-13-F is a Zener diode rated at 39 V with 370 mW power dissipation in a surface mount SOD-123 package. This component is classified as Obsolete, which necessitates identification of active equivalent parts for ongoing design support and procurement. The part meets automotive-grade specifications with AEC-Q101 qualification and ROHS3 compliance. Locating functionally equivalent substitutes ensures design continuity and supply chain reliability for applications requiring this voltage regulation characteristic.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	39	V
Tolerance	±5	%
Power - Maximum	370	mW
Impedance (Maximum)	80	Ohms
Current - Reverse Leakage @ 30 V	100	nA
Voltage - Forward (Maximum) @ 10 mA	900	mV
Operating Temperature Range	-65 to 150	°C (TJ)
Package Type	SOD-123	Surface Mount
Grade	Automotive	—
Qualification	AEC-Q101	—

Substitute Part Grouping Explanation

Substitution of the MMSZ5259BQ-13-F is determined by matching the following critical electrical and mechanical parameters:

Zener Voltage (Vz): 39 V nominal with ±5% tolerance
Power Dissipation: 370 mW maximum
Impedance (Zzt): 80 Ohms maximum
Reverse Leakage Current: 100 nA @ 30 V
Forward Voltage: 900 mV maximum @ 10 mA
Operating Temperature Range: -65°C to 150°C (TJ)
Package: SOD-123 surface mount
Automotive Grade: AEC-Q101 qualified
Compliance: ROHS3 compliant

The MMSZ5259BQ-7-F meets all specified electrical and mechanical parameters identically to the main part. The difference between these part numbers reflects manufacturing date code or tape/reel configuration only, with no impact on functional performance or electrical characteristics.

Parameter Comparison

Parameter	MMSZ5259BQ-13-F (Main)	MMSZ5259BQ-7-F (Substitute)	Match
Manufacturer	Diodes Incorporated	Diodes Incorporated	Yes
Category	Diodes, Zener	Diodes, Zener	Yes
Voltage - Zener (Nom)	39 V	39 V	Yes
Tolerance	±5%	±5%	Yes
Power - Max	370 mW	370 mW	Yes
Impedance (Max)	80 Ohms	80 Ohms	Yes
Current - Reverse Leakage @ Vr	100 nA @ 30 V	100 nA @ 30 V	Yes
Voltage - Forward (Max) @ If	900 mV @ 10 mA	900 mV @ 10 mA	Yes
Operating Temperature	-65°C ~ 150°C (TJ)	-65°C ~ 150°C (TJ)	Yes
Grade	Automotive	Automotive	Yes
Qualification	AEC-Q101	AEC-Q101	Yes
Mounting Type	Surface Mount	Surface Mount	Yes
Package / Case	SOD-123	SOD-123	Yes
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Yes
MSL	1 (Unlimited)	1 (Unlimited)	Yes
REACH Status	REACH Unaffected	REACH Unaffected	Yes
Product Status	Obsolete	Active	Different

Engineering Selection Recommendations

The MMSZ5259BQ-7-F is a direct functional equivalent to the MMSZ5259BQ-13-F. Both parts are manufactured by Diodes Incorporated and share identical electrical specifications, thermal characteristics, and package configuration. The primary distinction is product status: the main part is classified as Obsolete, while the substitute is Active.

For new designs or ongoing production requiring the MMSZ5259BQ-13-F, the MMSZ5259BQ-7-F is the appropriate selection. Both parts maintain AEC-Q101 automotive qualification and ROHS3 compliance, ensuring regulatory and quality standards are preserved. The substitute part offers superior supply chain availability with 1900 units in stock compared to 830 units of the obsolete variant.

No electrical performance degradation or functional compromise occurs with this substitution. The parts are pin-compatible, footprint-compatible, and electrically interchangeable across all specified operating conditions.

Frequently Asked Questions (FAQ)

Q: Can the MMSZ5259BQ-7-F be used as a direct replacement for the MMSZ5259BQ-13-F?

A: Yes. Both parts are electrically and mechanically identical. All electrical parameters, thermal ratings, package dimensions, and compliance certifications match exactly. The parts are directly interchangeable in circuit applications.

Q: What is the difference between the MMSZ5259BQ-13-F and MMSZ5259BQ-7-F part numbers?

A: The suffix designations (-13-F and -7-F) reflect manufacturing date codes or tape/reel configuration variants. These designations do not indicate functional or electrical differences. The base product number MMSZ5259 defines the core electrical specifications.

Q: Are both parts qualified for automotive applications?

A: Yes. Both the MMSZ5259BQ-13-F and MMSZ5259BQ-7-F carry AEC-Q101 automotive qualification and are rated for automotive-grade applications across the full operating temperature range of -65°C to 150°C.

Q: Does the SOD-123 package remain the same for both parts?

A: Yes. Both parts use the SOD-123 surface mount package. PCB footprints, reflow profiles, and assembly processes are identical.

Q: Are there any compliance or regulatory differences between these parts?

A: No. Both parts are ROHS3 compliant, REACH unaffected, and carry identical environmental and regulatory classifications. No compliance trade-offs exist between the two parts.

Q: Why is the MMSZ5259BQ-13-F listed as Obsolete?

A: The Obsolete status indicates the part is no longer in active production. The MMSZ5259BQ-7-F remains in active production and serves as the current manufacturing equivalent.

Q: Can existing inventory of MMSZ5259BQ-13-F be mixed with MMSZ5259BQ-7-F in production?

A: Yes. Since both parts are electrically and mechanically identical, they can be used interchangeably in the same assembly without any functional impact or performance variation.

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