MMSZ5259B Equivalent & Substitute Parts

Part Overview

The MMSZ5259B is an active-status zener diode manufactured by Taiwan Semiconductor Corporation, designed for voltage regulation and protection applications in surface mount configurations. This component operates at a nominal zener voltage of 39 V with 500 mW power dissipation capability in a compact SOD-123F package. Substitute parts are identified when electrical characteristics, mechanical specifications, and compliance certifications remain within the defined parameter tolerances, ensuring functional equivalence in circuit applications.

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
Voltage - Forward (Maximum) @ 10 mA	900	mV
Operating Temperature Range	-65 to 150	°C
Package Type	SOD-123F	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the MMSZ5259B are identified based on electrical parameter equivalence and mechanical compatibility. The substitution criteria are strictly defined by the following parameters:

Zener Voltage (Vz): 39 V nominal with ±5% tolerance
Power Dissipation (Pmax): 500 mW
Package Configuration: SOD-123F surface mount
Impedance (Zzt): 80 Ohms maximum
Reverse Leakage Current: 100 nA @ 30 V
Forward Voltage: 900 mV maximum @ 10 mA
Temperature Range: -65°C to 150°C junction temperature
Compliance: ROHS3 compliant, REACH unaffected

Parts meeting all these electrical and mechanical specifications are classified as parametric equivalents and direct substitutes. The MMSZ5259B RHG variant maintains identical electrical performance and package specifications while differing only in manufacturing lot designation and moisture sensitivity level classification.

Parameter Comparison

Parameter	MMSZ5259B	MMSZ5259B RHG	Match Status
Manufacturer	Taiwan Semiconductor Corporation	Taiwan Semiconductor Corporation	Identical
Category	Diodes, Zener	Diodes, Zener	Identical
Voltage - Zener (Nom)	39 V	39 V	Identical
Tolerance	±5%	±5%	Identical
Power - Max	500 mW	500 mW	Identical
Impedance (Max)	80 Ohms	80 Ohms	Identical
Current - Reverse Leakage @ Vr	100 nA @ 30 V	100 nA @ 30 V	Identical
Voltage - Forward (Max) @ If	900 mV @ 10 mA	Not specified	Main part specified
Operating Temperature	-65°C ~ 150°C (TJ)	-65°C ~ 150°C (TJ)	Identical
Mounting Type	Surface Mount	Surface Mount	Identical
Package / Case	SOD-123F	SOD-123F	Identical
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical
REACH Status	REACH Unaffected	REACH Unaffected	Identical
Product Status	Active	Active	Identical

Engineering Selection Recommendations

Both the MMSZ5259B and MMSZ5259B RHG are active-status components manufactured by Taiwan Semiconductor Corporation with full ROHS3 compliance and REACH unaffected status. Selection between these parts is based on availability and supply chain requirements rather than electrical performance differentiation.

The MMSZ5259B RHG variant carries a Moisture Sensitivity Level (MSL) classification of 1 (Unlimited), indicating superior moisture resistance characteristics compared to unspecified MSL ratings. This classification is relevant for applications requiring extended storage periods or exposure to humid environments prior to assembly.

Both parts are suitable for direct substitution in 39 V zener diode applications requiring 500 mW power dissipation in SOD-123F surface mount packages. Component selection should be based on current inventory availability, lead time requirements, and specific moisture sensitivity level requirements for the intended application environment.

Frequently Asked Questions (FAQ)

Q: Are MMSZ5259B and MMSZ5259B RHG electrically interchangeable?

A: Yes. Both parts maintain identical zener voltage (39 V ±5%), power rating (500 mW), impedance (80 Ohms maximum), reverse leakage current (100 nA @ 30 V), and operating temperature range (-65°C to 150°C). They are direct electrical equivalents.

Q: What is the significance of the "RHG" designation in MMSZ5259B RHG?

A: The RHG suffix indicates a manufacturing lot or variant designation from Taiwan Semiconductor Corporation. This designation does not affect electrical performance or package specifications. The primary distinction is the specified Moisture Sensitivity Level (MSL) of 1 (Unlimited) for the RHG variant.

Q: Can these parts be used interchangeably in PCB assembly?

A: Yes. Both parts use identical SOD-123F surface mount packages with matching pin configurations, footprints, and soldering requirements. No PCB layout modifications are required when substituting between these parts.

Q: What does MSL 1 (Unlimited) mean for the MMSZ5259B RHG?

A: MSL 1 (Unlimited) indicates that the component has no moisture sensitivity restrictions. The part can be stored indefinitely without requiring desiccant packaging or controlled humidity environments prior to assembly, providing greater flexibility in supply chain management.

Q: Are both parts RoHS3 compliant?

A: Yes. Both MMSZ5259B and MMSZ5259B RHG are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic component manufacturing and distribution.

Q: What is the base product number for these parts?

A: The base product number is MMSZ5259. Both MMSZ5259B and MMSZ5259B RHG are variants of this base product with identical electrical specifications.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message