Equivalent & Substitute Parts for MMSZ5230BT3

Part Overview

The MMSZ5230BT3 is a Zener diode rated at 4.7 V nominal with 500 mW power dissipation in SOD-123 surface mount packaging, manufactured by onsemi. This component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design support and procurement continuity. The electrical and mechanical specifications of this diode establish the baseline criteria for determining compatible alternatives across multiple manufacturers.

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 Range	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SOD-123	—

Substitute Part Grouping Explanation

Substitution of the MMSZ5230BT3 is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

Zener voltage: 4.7 V nominal
Tolerance: ±5%
Maximum power dissipation: 500 mW
Maximum impedance: 19 Ohms
Reverse leakage current: 5 µA @ 2 V
Forward voltage: 900 mV @ 10 mA
Operating temperature range: -55°C to 150°C minimum

Mechanical Equivalence Criteria:

Package type: SOD-123 surface mount
Mounting configuration: Surface mount

Parts are grouped into the following categories based on substitution relationship:

Direct Manufacturer Equivalent: Parts from onsemi with identical electrical specifications and active product status.

Parametric Equivalent (onsemi): Parts from onsemi meeting all electrical parameters with enhanced compliance or automotive qualification.

Parametric Equivalent (Vishay): Parts from Vishay General Semiconductor - Diodes Division meeting all electrical parameters with active product status.

Parametric Equivalent (Micro Commercial Co): Parts from Micro Commercial Co meeting all electrical parameters with active product status.

Upgrade Substitute: Parts from alternative manufacturers with extended operating temperature range or enhanced compliance status.

Similar Substitute: Parts with reduced power rating or modified package variant that do not meet full electrical equivalence.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Ir @ Vr (µA)	Vf (mV)	Temp Range (°C)	Package	Product Status	RoHS
MMSZ5230BT3	onsemi	4.7	±5%	500	19	5 @ 2V	900 @ 10mA	-55 to 150	SOD-123	Obsolete	Non-compliant
MMSZ5230BT1G	onsemi	4.7	±5%	500	19	5 @ 2V	900 @ 10mA	-55 to 150	SOD-123	Active	ROHS3 Compliant
SZMMSZ5230BT1G	onsemi	4.7	±5%	500	19	5 @ 2V	900 @ 10mA	-55 to 150	SOD-123	Active	ROHS3 Compliant
MMSZ5230B-7-F	Diodes Incorporated	4.7	±5%	500	19	5 @ 2V	900 @ 10mA	-65 to 150	SOD-123	Active	ROHS3 Compliant
BZT52H-C4V7,115	NXP Semiconductors	4.7	±5%	375	78	3 @ 2V	900 @ 10mA	-65 to 150	SOD-123F	Active	Not specified
MMSZ5230B-E3-08	Vishay General Semiconductor	4.7	±5%	500	19	5 @ 2V	Not specified	-55 to 150	SOD-123	Active	ROHS3 Compliant
MMSZ5230B-E3-18	Vishay General Semiconductor	4.7	±5%	500	19	5 @ 2V	Not specified	-55 to 150	SOD-123	Active	ROHS3 Compliant
MMSZ5230B-G3-08	Vishay General Semiconductor	4.7	±5%	500	19	5 @ 2V	Not specified	-55 to 150	SOD-123	Active	ROHS3 Compliant
MMSZ5230B-G3-18	Vishay General Semiconductor	4.7	±5%	500	19	5 @ 2V	Not specified	-55 to 150	SOD-123	Active	ROHS3 Compliant
MMSZ5230B-HE3-08	Vishay General Semiconductor	4.7	±5%	500	19	5 @ 2V	Not specified	-55 to 150	SOD-123	Obsolete	ROHS3 Compliant
MMSZ5230B-TP	Micro Commercial Co	4.7	±5%	500	19	5 @ 2V	900 @ 10mA	-55 to 150	SOD-123	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation - Direct Replacement: MMSZ5230BT1G (onsemi) is the direct successor to MMSZ5230BT3. This part maintains identical electrical specifications and SOD-123 packaging while transitioning from obsolete to active product status with ROHS3 compliance. This part is suitable for direct substitution in all applications.

Automotive-Grade Alternative: SZMMSZ5230BT1G (onsemi) provides the same electrical performance as MMSZ5230BT1G with automotive qualification (AEC-Q101) and active product status. This part is appropriate for applications requiring automotive-grade components.

Extended Temperature Range Option: MMSZ5230B-7-F (Diodes Incorporated) extends the operating temperature range to -65°C to 150°C while maintaining all other electrical parameters and SOD-123 packaging. This part is suitable for applications requiring enhanced low-temperature performance.

Vishay Parametric Equivalents: MMSZ5230B-E3-08, MMSZ5230B-E3-18, MMSZ5230B-G3-08, and MMSZ5230B-G3-18 (Vishay General Semiconductor - Diodes Division) meet all electrical specifications with active product status and ROHS3 compliance. These parts are suitable for direct substitution.

Limited Substitution - Reduced Power Rating: BZT52H-C4V7,115 (NXP Semiconductors) maintains the 4.7 V zener voltage and ±5% tolerance but reduces maximum power dissipation to 375 mW and increases impedance to 78 Ohms. This part is suitable only for applications where the reduced power rating and modified package variant (SOD-123F) are acceptable.

Frequently Asked Questions (FAQ)

Q: Can MMSZ5230BT1G be used as a direct replacement for MMSZ5230BT3?

A: Yes. MMSZ5230BT1G is electrically and mechanically identical to MMSZ5230BT3 with the same 4.7 V zener voltage, 500 mW power rating, SOD-123 package, and operating temperature range. The primary difference is product status transition from obsolete to active with ROHS3 compliance.

Q: What is the difference between MMSZ5230BT1G and SZMMSZ5230BT1G?

A: Both parts are manufactured by onsemi with identical electrical specifications and SOD-123 packaging. SZMMSZ5230BT1G includes automotive qualification (AEC-Q101) designation, making it suitable for automotive applications. Selection depends on application requirements.

Q: Why does BZT52H-C4V7,115 have different electrical parameters?

A: BZT52H-C4V7,115 is classified as a similar substitute rather than a parametric equivalent. While it maintains the 4.7 V zener voltage and ±5% tolerance, the maximum power dissipation is reduced to 375 mW and impedance increases to 78 Ohms. This part is suitable only for applications where these reduced specifications are acceptable.

Q: Are all Vishay parts (MMSZ5230B-E3-08, MMSZ5230B-E3-18, MMSZ5230B-G3-08, MMSZ5230B-G3-18) interchangeable?

A: These Vishay parts are parametric equivalents with identical electrical specifications and SOD-123 packaging. The designations reflect different packaging configurations (tape and reel variants). Selection depends on procurement and assembly requirements.

Q: What does the extended temperature range in MMSZ5230B-7-F provide?

A: MMSZ5230B-7-F extends the minimum operating temperature from -55°C to -65°C. This provides enhanced performance in applications requiring operation at lower ambient temperatures while maintaining all other electrical parameters identical to the MMSZ5230BT3.

Q: Is MMSZ5230B-HE3-08 suitable for new designs?

A: MMSZ5230B-HE3-08 is classified as obsolete despite ROHS3 compliance. While it meets all electrical specifications and includes automotive qualification (AEC-Q101), active alternatives such as MMSZ5230BT1G or SZMMSZ5230BT1G are recommended for new designs.

Q: What packaging options are available for substitutes?

A: All recommended parametric equivalents use SOD-123 surface mount packaging, maintaining mechanical compatibility with the original MMSZ5230BT3. BZT52H-C4V7,115 uses SOD-123F packaging, which is a variant that may require design review for compatibility.

Q: Are all substitute parts ROHS3 compliant?

A: All active substitute parts listed are ROHS3 compliant. The original MMSZ5230BT3 is RoHS non-compliant. Compliance status should be verified against specific application and regulatory requirements.

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