MMSZ5230B Zener Diode 4.7V 500mW SOD-123 Equivalent & Substitute Parts

Part Overview

The MMSZ5230B is a 4.7 V Zener diode rated for 500 mW power dissipation in a surface mount SOD-123 package, manufactured by onsemi. This component is classified as obsolete, indicating that direct procurement from the original manufacturer may be limited. Equivalent and substitute parts are necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production requirements for applications utilizing this Zener diode specification.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	4.7	V
Tolerance	±5%	—
Power - Max	500	mW
Impedance (Max)	19	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 2 V
Voltage - Forward (Vf) (Max) @ If	900	mV @ 10 mA
Operating Temperature	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SOD-123	—

Substitute Part Grouping Explanation

Substitution of the MMSZ5230B is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - Zener (Nom): 4.7 V
Power - Max: 500 mW
Package / Case: SOD-123
Mounting Type: Surface Mount
Operating Temperature Range: -55°C to 150°C (minimum)

Secondary Compatibility Parameters:

Tolerance: ±5%
Voltage - Forward (Vf) (Max) @ If: 900 mV @ 10 mA
Current - Reverse Leakage @ Vr: 5 µA @ 2 V (or equivalent specification)

Substitute parts are grouped into three categories based on product status and compliance:

Direct Equivalents (Active Status): Parts with identical electrical specifications and active product status, suitable for direct replacement.
Parametric Equivalents (Automotive Grade): Parts meeting all electrical specifications with automotive qualification (AEC-Q101), providing enhanced reliability for automotive applications.
Functional Equivalents (Obsolete Status): Parts with matching specifications but obsolete status, suitable only when active alternatives are unavailable.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Vf @ 10mA (mV)	Operating Temp (°C)	Product Status	RoHS Status	Automotive Grade
MMSZ5230B	onsemi	4.7	±5%	500	19	900	-55 to 150	Obsolete	Not Specified	No
MMSZ4688T1G	onsemi	4.7	Not Specified	500	Not Specified	900	-55 to 150	Active	ROHS3 Compliant	No
MMSZ4V7T1G	onsemi	4.7	±5%	500	80	900	-55 to 150	Active	ROHS3 Compliant	No
MMSZ5230BT1G	onsemi	4.7	±5%	500	19	900	-55 to 150	Active	ROHS3 Compliant	No
SZMMSZ4688T1G	onsemi	4.7	±5%	500	Not Specified	900	-55 to 150	Active	ROHS3 Compliant	Yes (AEC-Q101)
SZMMSZ4V7T1G	onsemi	4.7	±5%	500	80	900	-55 to 150	Active	ROHS3 Compliant	Yes (AEC-Q101)
SZMMSZ5230BT1G	onsemi	4.7	±5%	500	19	900	-55 to 150	Active	ROHS3 Compliant	Yes (AEC-Q101)
CMHZ5230B TR13	Central Semiconductor Corp	4.7	±5%	500	19	900	-55 to 150	Obsolete	RoHS Non-Compliant	No
DDZ9688Q-7	Diodes Incorporated	4.7	±5%	500	Not Specified	900	-65 to 150	Active	ROHS3 Compliant	Yes (AEC-Q101)
MMSZ5230B-TP	Micro Commercial Co	4.7	±5%	500	19	900	-55 to 150	Active	ROHS3 Compliant	No
MMSZ5230B-7-F	Diodes Incorporated	4.7	±5%	500	19	900	-65 to 150	Active	ROHS3 Compliant	No

Engineering Selection Recommendations

For Standard Industrial Applications:

MMSZ5230BT1G (onsemi) is the primary recommended substitute. This part maintains identical electrical specifications to the MMSZ5230B, including 19 Ohms maximum impedance and ±5% tolerance. Product status is active with ROHS3 compliance, ensuring long-term availability and regulatory compliance.

For Automotive Applications:

SZMMSZ5230BT1G (onsemi) is the recommended selection for automotive environments. This part provides identical electrical performance with AEC-Q101 automotive qualification and ROHS3 compliance. The automotive-grade designation ensures qualification for temperature cycling, vibration, and reliability testing per automotive standards.

Alternative automotive option: DDZ9688Q-7 (Diodes Incorporated) offers extended operating temperature range (-65°C to 150°C) with AEC-Q101 qualification and ROHS3 compliance, suitable for extreme temperature automotive applications.

For Cost-Optimized Procurement:

MMSZ4688T1G (onsemi) provides active product status and ROHS3 compliance at potentially lower cost. This part meets the core electrical specifications (4.7 V, 500 mW, SOD-123) with active inventory availability.

For Extended Temperature Range:

MMSZ5230B-7-F (Diodes Incorporated) extends the operating temperature range to -65°C to 150°C while maintaining all other electrical specifications identical to the original part. This option is suitable for applications requiring enhanced low-temperature performance.

Avoid:

CMHZ5230B TR13 (Central Semiconductor Corp) is obsolete and RoHS non-compliant. This part should not be selected for new designs or ongoing production.

Frequently Asked Questions (FAQ)

Q: Can MMSZ4V7T1G be used as a direct substitute for MMSZ5230B?

A: MMSZ4V7T1G meets the core electrical requirements (4.7 V, 500 mW, SOD-123, ±5% tolerance) and operating temperature range. However, the impedance specification differs (80 Ohms maximum versus 19 Ohms). Selection depends on circuit impedance requirements. If the original design specifies 19 Ohms maximum impedance, MMSZ4V7T1G is not suitable. If impedance is not a critical parameter, MMSZ4V7T1G is functionally equivalent.

Q: What is the difference between MMSZ5230BT1G and SZMMSZ5230BT1G?

A: Both parts are manufactured by onsemi with identical electrical specifications (4.7 V, 500 mW, 19 Ohms impedance, SOD-123). The primary difference is that SZMMSZ5230BT1G carries automotive-grade designation with AEC-Q101 qualification. For automotive applications, SZMMSZ5230BT1G is required. For non-automotive applications, MMSZ5230BT1G is suitable.

Q: Is the CMHZ5230B TR13 acceptable for new designs?

A: No. CMHZ5230B TR13 is classified as obsolete and is RoHS non-compliant. This part should not be selected for new designs. Active alternatives with ROHS3 compliance are available and recommended.

Q: What packaging options are available for substitutes?

A: Substitute parts are available in two packaging formats: Cut Tape (CT) & Digi-Reel® and Tape & Reel (TR). Both formats provide SOD-123 package configuration. Selection between packaging formats depends on procurement and assembly requirements. Cut Tape format is suitable for lower-volume applications, while Tape & Reel format is optimized for high-volume automated assembly.

Q: Can DDZ9688Q-7 replace MMSZ5230B in all applications?

A: DDZ9688Q-7 meets all electrical specifications and extends the operating temperature range to -65°C to 150°C. This part is manufactured by Diodes Incorporated with AEC-Q101 automotive qualification and ROHS3 compliance. DDZ9688Q-7 is suitable for all applications where MMSZ5230B was used, with the added benefit of extended low-temperature performance.

Q: What is the significance of the ±5% tolerance specification?

A: The ±5% tolerance indicates the acceptable variation in the Zener voltage from the nominal 4.7 V specification. This means the actual Zener voltage will fall between 4.465 V and 4.935 V. All recommended substitutes maintain this tolerance specification, ensuring circuit performance consistency.

Q: Are all substitute parts ROHS3 compliant?

A: All active substitute parts listed are ROHS3 compliant except CMHZ5230B TR13, which is RoHS non-compliant and obsolete. ROHS3 compliance is mandatory for new designs and ongoing production in most markets.

Q: What is the difference between standard and automotive-grade Zener diodes?

A: Automotive-grade parts (designated with SZ prefix and AEC-Q101 qualification) undergo additional qualification testing including temperature cycling, vibration, and reliability assessment per automotive industry standards. These parts are required for automotive applications. Standard-grade parts are suitable for industrial and consumer applications.

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