MMSZ5230BT1 Equivalent & Substitute Parts

Part Overview

The MMSZ5230BT1 is a Zener diode rated at 4.7 V nominal with 500 mW power dissipation in a surface mount SOD-123 package. Manufactured by onsemi, this component is classified as obsolete product status. Due to its obsolete designation, equivalent and substitute parts from active product lines are necessary for ongoing design support, procurement continuity, and new production requirements.

Key Parameters

Parameter	Value
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°C ~ 150°C
Mounting Type	Surface Mount
Package / Case	SOD-123

Substitute Part Grouping Explanation

Substitution of the MMSZ5230BT1 is determined by the following critical parameters:

Electrical Parameters:

Zener voltage: 4.7 V nominal
Tolerance: ±5% or tighter
Power dissipation: 500 mW or greater
Impedance: 19 Ohms maximum
Reverse leakage current: 5 µA @ 2 V or lower
Forward voltage: 900 mV @ 10 mA maximum
Operating temperature range: -55°C to 150°C minimum

Mechanical Parameters:

Mounting type: Surface Mount
Package: SOD-123 or compatible footprint

Substitute parts are grouped into three categories:

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

Parametric Equivalents: Parts from Vishay General Semiconductor and Micro Commercial Co with matching electrical parameters and active product status.

Similar Parts: Parts from alternative manufacturers (NXP Semiconductors) with comparable electrical characteristics but differing package designations or power ratings.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Ir @ Vr	Vf (Max) @ If	Temp Range	Package	Status	RoHS
MMSZ5230BT1	onsemi	4.7 V	±5%	500 mW	19 Ω	5 µA @ 2 V	900 mV @ 10 mA	-55°C ~ 150°C	SOD-123	Obsolete	Non-compliant
MMSZ5230BT1G	onsemi	4.7 V	±5%	500 mW	19 Ω	5 µA @ 2 V	900 mV @ 10 mA	-55°C ~ 150°C	SOD-123	Active	ROHS3 Compliant
SZMMSZ5230BT1G	onsemi	4.7 V	±5%	500 mW	19 Ω	5 µA @ 2 V	900 mV @ 10 mA	-55°C ~ 150°C	SOD-123	Active	ROHS3 Compliant
MMSZ5230B-E3-08	Vishay General Semiconductor	4.7 V	±5%	500 mW	19 Ω	5 µA @ 2 V	Not specified	-55°C ~ 150°C	SOD-123	Active	ROHS3 Compliant
MMSZ5230B-E3-18	Vishay General Semiconductor	4.7 V	±5%	500 mW	19 Ω	5 µA @ 2 V	Not specified	-55°C ~ 150°C	SOD-123	Active	ROHS3 Compliant
MMSZ5230B-G3-08	Vishay General Semiconductor	4.7 V	±5%	500 mW	19 Ω	5 µA @ 2 V	Not specified	-55°C ~ 150°C	SOD-123	Active	ROHS3 Compliant
MMSZ5230B-G3-18	Vishay General Semiconductor	4.7 V	±5%	500 mW	19 Ω	5 µA @ 2 V	Not specified	-55°C ~ 150°C	SOD-123	Active	ROHS3 Compliant
MMSZ5230B-HE3-08	Vishay General Semiconductor	4.7 V	±5%	500 mW	19 Ω	5 µA @ 2 V	Not specified	-55°C ~ 150°C	SOD-123	Obsolete	ROHS3 Compliant
MMSZ5230B-TP	Micro Commercial Co	4.7 V	±5%	500 mW	19 Ω	5 µA @ 2 V	900 mV @ 10 mA	-55°C ~ 150°C	SOD-123	Active	ROHS3 Compliant
MMSZ5230C-E3-08	Vishay General Semiconductor	4.7 V	±2%	500 mW	19 Ω	5 µA @ 2 V	Not specified	-55°C ~ 150°C	SOD-123	Active	ROHS3 Compliant
BZT52H-C4V7,115	NXP Semiconductors	4.7 V	±5%	375 mW	78 Ω	3 µA @ 2 V	900 mV @ 10 mA	-65°C ~ 150°C	SOD-123F	Active	Not specified

Engineering Selection Recommendations

Primary Recommendation - Direct onsemi Equivalent:

MMSZ5230BT1G is the direct successor to the obsolete MMSZ5230BT1. This part maintains identical electrical specifications while offering active product status and ROHS3 compliance. Selection of this part eliminates obsolescence risk and ensures long-term availability.

Secondary Recommendation - Automotive-Grade onsemi Equivalent:

SZMMSZ5230BT1G provides the same electrical performance as MMSZ5230BT1G with automotive-grade qualification (AEC-Q101). This part is suitable for applications requiring automotive-level reliability and traceability. Inventory availability is significantly higher at 20,300 pieces.

Tertiary Recommendations - Vishay Parametric Equivalents:

MMSZ5230B-E3-08, MMSZ5230B-E3-18, MMSZ5230B-G3-08, and MMSZ5230B-G3-18 from Vishay General Semiconductor provide full electrical equivalence with active product status and ROHS3 compliance. These parts differ only in packaging configuration (tape reel specifications). Selection depends on procurement and assembly requirements.

Tighter Tolerance Alternative:

MMSZ5230C-E3-08 offers ±2% tolerance compared to the standard ±5%, providing improved voltage accuracy for applications requiring tighter regulation. All other electrical parameters remain equivalent.

Automotive-Grade Vishay Option:

MMSZ5230B-HE3-08 includes AEC-Q101 automotive qualification but carries obsolete product status. This part should be avoided for new designs despite automotive certification.

Alternative Manufacturer Option:

BZT52H-C4V7,115 from NXP Semiconductors maintains the 4.7 V zener voltage and ±5% tolerance but differs in power rating (375 mW versus 500 mW) and impedance (78 Ohms versus 19 Ohms). This part is suitable only for applications with lower power requirements and can tolerate higher impedance characteristics.

Frequently Asked Questions (FAQ)

Q: Can MMSZ5230BT1G directly replace MMSZ5230BT1 without circuit modification?

A: Yes. MMSZ5230BT1G maintains identical electrical specifications including zener voltage, tolerance, power rating, impedance, and operating temperature range. The SOD-123 package footprint is identical. No circuit modifications are required.

Q: What is the difference between MMSZ5230BT1G and SZMMSZ5230BT1G?

A: Both parts have identical electrical specifications. SZMMSZ5230BT1G includes automotive-grade qualification (AEC-Q101) and carries the "SZ" prefix designation. Selection depends on application requirements for automotive certification. SZMMSZ5230BT1G offers higher inventory availability.

Q: Are Vishay MMSZ5230B series parts fully compatible with the original MMSZ5230BT1?

A: Yes. Vishay parts MMSZ5230B-E3-08, MMSZ5230B-E3-18, MMSZ5230B-G3-08, and MMSZ5230B-G3-18 provide full electrical equivalence. Differences exist only in tape reel packaging specifications (E3 versus G3 designations and quantity per reel). All maintain SOD-123 package compatibility.

Q: What does the "C" designation in MMSZ5230C-E3-08 indicate?

A: The "C" designation indicates ±2% tolerance compared to ±5% tolerance in "B" series parts. All other electrical parameters remain identical. This part is suitable for applications requiring tighter voltage regulation accuracy.

Q: Why does BZT52H-C4V7,115 show lower power rating and higher impedance?

A: BZT52H-C4V7,115 is a different product line from NXP Semiconductors with different internal design characteristics. While maintaining the 4.7 V zener voltage, this part is rated for 375 mW maximum power and exhibits 78 Ohms impedance. This part is suitable only for applications with lower power dissipation requirements.

Q: What is the significance of the packaging codes (E3, G3, HE3) in Vishay part numbers?

A: These codes indicate different tape reel configurations and quantities per reel. E3 and G3 designations specify different reel sizes and tape specifications for automated assembly equipment. The electrical specifications remain identical across these variants. Selection depends on assembly line compatibility and procurement preferences.

Q: Is ROHS3 compliance important for my application?

A: ROHS3 compliance is mandatory for products sold in the European Union and many other regions. All active substitute parts listed carry ROHS3 compliance. The original MMSZ5230BT1 is non-compliant, making the transition to compliant alternatives necessary for regulatory adherence.

Q: Can I use MMSZ5230B-HE3-08 despite its obsolete status?

A: MMSZ5230B-HE3-08 carries obsolete product status and should be avoided for new designs. Although it includes AEC-Q101 automotive qualification, obsolete designation indicates discontinued manufacturing and limited future availability. Active alternatives with equivalent specifications are available.

Q: What is the difference between Cut Tape (CT) and Tape & Reel (TR) packaging?

A: Cut Tape packaging provides individual components cut from the reel for manual handling or small-quantity assembly. Tape & Reel packaging maintains components on continuous tape for automated pick-and-place assembly equipment. Both formats contain identical components; selection depends on assembly process requirements.

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