MMSZ5231B Zener Diode Equivalent & Substitute Parts

Part Overview

The MMSZ5231B is an active surface mount zener diode manufactured by Taiwan Semiconductor Corporation, designed for voltage regulation and protection applications. This component operates at a nominal zener voltage of 5.1 V with a maximum power dissipation of 500 mW in a compact SOD-123F package. The part is ROHS3 compliant and REACH unaffected, making it suitable for modern electronic applications requiring environmental compliance. Substitute parts are identified based on identical electrical specifications and package compatibility to ensure direct functional replacement in circuit designs.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	5.1	V
Tolerance	±5%	%
Power - Max	500	mW
Impedance (Max)	17	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 2 V
Voltage - Forward (Vf) (Max) @ If	900	mV @ 10 mA
Operating Temperature Range	-65 to 150	°C (TJ)
Package / Case	SOD-123F	-
Mounting Type	Surface Mount	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitute parts for the MMSZ5231B are identified through parametric equivalence. The substitution criteria are based on the following key parameters that must remain constant across all equivalent devices:

Nominal zener voltage: 5.1 V
Voltage tolerance: ±5%
Maximum power dissipation: 500 mW
Maximum impedance: 17 Ohms
Reverse leakage current: 5 µA @ 2 V
Forward voltage: 900 mV @ 10 mA
Operating temperature range: -65°C to 150°C
Package type: SOD-123F surface mount
Compliance standards: ROHS3 and REACH requirements

Parts meeting all these electrical and mechanical specifications are classified as parametric equivalents and direct functional substitutes. Packaging variations (such as tape and reel versus bulk packaging) do not affect electrical equivalence.

Parameter Comparison

Parameter	MMSZ5231B	MMSZ5231B RHG
Manufacturer	Taiwan Semiconductor Corporation	Taiwan Semiconductor Corporation
Category	Diodes, Zener	Diodes, Zener
Voltage - Zener (Nom)	5.1 V	5.1 V
Tolerance	±5%	±5%
Power - Max	500 mW	500 mW
Impedance (Max)	17 Ohms	17 Ohms
Current - Reverse Leakage @ Vr	5 µA @ 2 V	5 µA @ 2 V
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA	900 mV @ 10 mA
Operating Temperature	-65°C ~ 150°C (TJ)	-65°C ~ 150°C (TJ)
Mounting Type	Surface Mount	Surface Mount
Package / Case	SOD-123F	SOD-123F
Product Status	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

Both the MMSZ5231B and MMSZ5231B RHG are active products from Taiwan Semiconductor Corporation with identical electrical specifications and package configurations. Selection between these parts is determined by supply chain and packaging requirements rather than electrical performance.

The MMSZ5231B RHG variant is supplied in tape and reel packaging, which is standard for automated assembly processes and high-volume production environments. The base MMSZ5231B is available in alternative packaging configurations suitable for different procurement and assembly workflows.

Both parts maintain full compliance with ROHS3 and REACH regulatory requirements, ensuring compatibility with modern manufacturing and environmental standards. The identical electrical parameters guarantee functional interchangeability in all circuit applications where the MMSZ5231B is specified.

Frequently Asked Questions (FAQ)

Q: Can MMSZ5231B RHG be used as a direct replacement for MMSZ5231B?

A: Yes. Both parts are parametric equivalents with identical electrical specifications, including zener voltage (5.1 V), power rating (500 mW), impedance (17 Ohms), and operating temperature range (-65°C to 150°C). The only difference is packaging format (tape and reel versus bulk).

Q: What is the significance of the RHG designation in MMSZ5231B RHG?

A: The RHG designation indicates the packaging format. This variant is supplied in tape and reel (TR) configuration, which is optimized for automated pick-and-place assembly processes. The electrical performance is identical to the base part number.

Q: Are there any compliance differences between MMSZ5231B and MMSZ5231B RHG?

A: No. Both parts are ROHS3 compliant and REACH unaffected. They meet identical environmental and regulatory standards.

Q: What parameters must remain constant when selecting a substitute zener diode?

A: The critical parameters for substitution are nominal zener voltage (5.1 V), voltage tolerance (±5%), maximum power dissipation (500 mW), package type (SOD-123F), and operating temperature range (-65°C to 150°C). Deviations in any of these parameters result in a non-equivalent part.

Q: Can these parts be used interchangeably in production?

A: Yes, provided your assembly process accommodates the packaging format. MMSZ5231B RHG in tape and reel format is suitable for automated assembly lines, while alternative packaging of the base MMSZ5231B may be preferred for manual assembly or specific procurement workflows.

Q: What is the reverse leakage current specification?

A: The reverse leakage current is specified as 5 µA at a reverse voltage (Vr) of 2 V. This parameter is identical across all equivalent parts and is critical for applications requiring low standby current.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message