MMSZ20VCF Equivalent & Substitute Parts

Part Overview

The MMSZ20VCF is a Zener diode rated at 20 V nominal voltage with 1 W maximum power dissipation, manufactured by onsemi in the SOD-123F surface mount package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for new designs and ongoing production requirements. The part maintains ROHS3 compliance and unlimited moisture sensitivity rating, making it suitable for standard industrial applications.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	20	V
Tolerance	±5%	—
Power - Max	1	W
Impedance (Max)	15	Ohms
Mounting Type	Surface Mount	—
Package / Case	SOD-123F	—
Operating Temperature	150	°C (TJ)
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the MMSZ20VCF is determined by the following critical parameters: nominal Zener voltage (20 V), voltage tolerance (±5%), surface mount technology, and RoHS3 compliance. The substitute parts identified maintain these core electrical specifications while differing in maximum power dissipation, package variant, and operating temperature range.

The MMSZ20T1G operates at reduced power (500 mW versus 1 W) in the SOD-123 package, representing a lower-power alternative suitable for applications with reduced thermal requirements. The ACZRW5250B-G provides the lowest power rating (350 mW) in the SOD-123F package with automotive-grade qualification and extended temperature range, serving specialized applications requiring AEC-Q101 certification.

Parameter Comparison

Parameter	MMSZ20VCF	MMSZ20T1G	ACZRW5250B-G
Manufacturer	onsemi	onsemi	Comchip Technology
Voltage - Zener (Nom)	20 V	20 V	20 V
Tolerance	±5%	±5%	±5%
Power - Max	1 W	500 mW	350 mW
Impedance (Max)	15 Ohms	55 Ohms	25 Ohms
Current - Reverse Leakage @ Vr	1 µA @ 15 V	50 nA @ 14 V	100 nA @ 15 V
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 200 mA	900 mV @ 10 mA	900 mV @ 10 mA
Operating Temperature	150°C (TJ)	-55°C ~ 150°C	-65°C ~ 150°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	SOD-123F	SOD-123	SOD-123F
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

MMSZ20T1G is the primary substitute for applications where the original 1 W power rating is not required. This part maintains onsemi manufacturing continuity, shares the same base product number (MMSZ20), and is currently in active production status. The reduced power specification (500 mW) is suitable for signal-level Zener applications and general-purpose voltage regulation circuits with lower current demands. The SOD-123 package is mechanically compatible with SOD-123F footprints in most PCB designs.

ACZRW5250B-G is the recommended substitute for automotive and extended-temperature applications. This Comchip Technology part carries AEC-Q101 automotive qualification and operates across an extended temperature range (-65°C to 150°C). The SOD-123F package matches the original part's footprint exactly. The 350 mW power rating is appropriate for low-power protection and voltage reference circuits. This part is suitable for applications requiring automotive-grade reliability and traceability.

Both substitute parts maintain the critical 20 V nominal Zener voltage, ±5% tolerance, and ROHS3 compliance required for regulatory conformance. Selection between substitutes depends on application power requirements and environmental operating conditions.

Frequently Asked Questions (FAQ)

Q: Can MMSZ20T1G directly replace MMSZ20VCF in all applications?

A: MMSZ20T1G is suitable for applications where maximum power dissipation does not exceed 500 mW. The reduced power rating limits use in high-current Zener regulation circuits. Verify circuit current requirements before substitution. Both parts share identical Zener voltage (20 V) and tolerance (±5%), ensuring voltage regulation compatibility.

Q: What is the difference between SOD-123 and SOD-123F packages?

A: SOD-123F is a variant of SOD-123 with modified lead geometry. Both packages are surface mount and mechanically similar. PCB footprints designed for SOD-123F accommodate SOD-123 components. The MMSZ20T1G (SOD-123) is physically compatible with MMSZ20VCF (SOD-123F) PCB layouts.

Q: Is ACZRW5250B-G suitable for non-automotive applications?

A: Yes. ACZRW5250B-G meets ROHS3 compliance and standard industrial specifications. The AEC-Q101 automotive qualification indicates enhanced reliability and process control, making it suitable for any application requiring high reliability. The extended operating temperature range (-65°C to 150°C) provides additional margin for demanding environments.

Q: How do impedance differences affect circuit performance?

A: Impedance (Zzt) affects transient response and noise filtering characteristics. MMSZ20VCF specifies 15 Ohms maximum impedance, MMSZ20T1G specifies 55 Ohms, and ACZRW5250B-G specifies 25 Ohms. Higher impedance results in slower transient response. For applications requiring fast voltage regulation response, MMSZ20VCF or ACZRW5250B-G are preferred over MMSZ20T1G.

Q: What does the reverse leakage current specification indicate?

A: Reverse leakage current (measured at specified reverse voltage) indicates the quality of the Zener junction. Lower leakage current (MMSZ20T1G at 50 nA) indicates superior junction quality and lower standby power consumption. MMSZ20VCF specifies 1 µA leakage, which is acceptable for standard applications but higher than modern alternatives.

Q: Are all three parts available in the same packaging format?

A: MMSZ20VCF and ACZRW5250B-G use SOD-123F packaging. MMSZ20T1G uses SOD-123 packaging. Both packages are surface mount and mechanically compatible on standard PCB layouts. Tape & Reel (TR) packaging is available for all three parts for automated assembly processes.

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