MMBZ5230B-7 Zener Diode Equivalent & Substitute Parts

Part Overview

The MMBZ5230B-7 is a 4.7 V zener diode manufactured by Diodes Incorporated, rated for 350 mW power dissipation in a surface mount SOT-23-3 package. This part is discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and procurement. The MMBZ5230B-7 operates across a temperature range of -65°C to 150°C with ±5% voltage tolerance and is classified as RoHS non-compliant.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	4.7	V
Tolerance	±5%	—
Power - Maximum	350	mW
Impedance (Maximum)	19	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 2 V
Voltage - Forward (Maximum) @ If	900	mV @ 10 mA
Operating Temperature Range	-65 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SOT-23-3 (TO-236-3, SC-59)	—

Substitute Part Grouping Explanation

Substitution of the MMBZ5230B-7 is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 4.7 V nominal
Package type: SOT-23-3 surface mount
Operating temperature range compatibility
Power dissipation rating (350 mW or higher)
Impedance characteristics (Zzt)
Reverse leakage current specifications

Substitution Categories:

Category 1: Direct Parametric Equivalents — Parts matching all electrical specifications and the original 350 mW power rating with identical impedance (19 Ohms). These parts are pin-compatible and functionally interchangeable without circuit modification.

Category 2: Functional Equivalents with Reduced Power Rating — Parts with 4.7 V zener voltage and SOT-23-3 packaging but lower power dissipation (225 mW). These are suitable for applications where the full 350 mW rating is not required.

Category 3: Functional Equivalents with Modified Impedance — Parts with 4.7 V zener voltage and SOT-23-3 packaging but higher impedance (80 Ohms) and reduced power rating (250 mW). These parts include automotive-grade qualification and tighter voltage tolerance.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Leakage @ 2V (µA)	Vf @ 10mA (mV)	Temp Range (°C)	Package	RoHS Status	Product Status
MMBZ5230B-7	Diodes Incorporated	4.7	±5%	350	19	5	900	-65 to 150	SOT-23-3	Non-compliant	Discontinued
MMBZ5230B-7-F	Diodes Incorporated	4.7	±5%	350	19	5	900	-65 to 150	SOT-23-3	ROHS3 Compliant	Active
BZX84-A4V7,215	Nexperia USA Inc.	4.7	±1%	250	80	3	900	-65 to 150	TO-236AB	ROHS3 Compliant	Active
BZX84-B4V7,215	NXP Semiconductors	4.7	±2%	250	80	3	900	-65 to 150	TO-236AB	ROHS3 Compliant	Active
BZX84C4V7-TP	Micro Commercial Co	4.7	±5%	350	80	3	900	-55 to 150	SOT-23	ROHS3 Compliant	Active
MMBZ5230B-TP	Micro Commercial Co	4.7	±5%	350	19	5	900	-55 to 150	SOT-23	ROHS3 Compliant	Active
MMBZ5230BLT1G	onsemi	4.7	±5%	225	19	5	900	-65 to 150	SOT-23-3	ROHS3 Compliant	Active
CMPZ5230B TR PBFREE	Central Semiconductor Corp	4.7	±5%	350	19	5	900	-65 to 150	SOT-23	ROHS3 Compliant	Active

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance):

MMBZ5230B-7-F is the primary direct replacement. This part is manufactured by Diodes Incorporated with identical electrical specifications (4.7 V, ±5%, 350 mW, 19 Ohms impedance) and maintains the same SOT-23-3 package. The key difference is ROHS3 compliance and active product status. This part is recommended when the original specification must be preserved without modification.

For RoHS3-Compliant Designs with Equivalent Performance:

CMPZ5230B TR PBFREE (Central Semiconductor Corp) provides identical electrical parameters to the original part (4.7 V, ±5%, 350 mW, 19 Ohms impedance, -65°C to 150°C) with ROHS3 compliance and active status. This part is suitable for designs requiring regulatory compliance without performance compromise.

MMBZ5230B-TP (Micro Commercial Co) offers the same electrical specifications with ROHS3 compliance but operates across -55°C to 150°C, which is acceptable for applications not requiring the full -65°C lower temperature limit.

For Automotive-Grade Applications:

BZX84-A4V7,215 (Nexperia USA Inc.) and BZX84-B4V7,215 (NXP Semiconductors) are AEC-Q101 qualified automotive-grade parts. These parts feature tighter voltage tolerance (±1% and ±2% respectively) and lower reverse leakage (3 µA @ 2 V). Power dissipation is reduced to 250 mW with impedance of 80 Ohms. These parts are suitable for automotive applications where the reduced power rating is acceptable.

For Applications with Relaxed Power Requirements:

MMBZ5230BLT1G (onsemi) provides a 225 mW power rating with identical impedance (19 Ohms) and voltage specifications. This part is suitable for low-power applications where the full 350 mW rating is not required, offering cost optimization while maintaining electrical compatibility.

Frequently Asked Questions (FAQ)

Q: Can MMBZ5230B-7-F be used as a direct replacement for MMBZ5230B-7?

A: Yes. MMBZ5230B-7-F is a direct parametric equivalent with identical electrical specifications (4.7 V, ±5%, 350 mW, 19 Ohms impedance) and SOT-23-3 packaging. The primary differences are ROHS3 compliance and active product status. No circuit modification is required.

Q: What is the difference between the 19 Ohms and 80 Ohms impedance variants?

A: Impedance (Zzt) affects the dynamic resistance of the zener diode. The 19 Ohms impedance (MMBZ5230B-7, MMBZ5230B-7-F, MMBZ5230B-TP, MMBZ5230BLT1G, CMPZ5230B TR PBFREE) provides lower dynamic resistance, resulting in better voltage regulation across varying load conditions. The 80 Ohms impedance (BZX84-A4V7,215, BZX84-B4V7,215, BZX84C4V7-TP) is characteristic of automotive-grade parts and is suitable for applications where tighter voltage tolerance compensates for higher impedance.

Q: Are the automotive-grade parts (BZX84-A4V7,215 and BZX84-B4V7,215) suitable for non-automotive applications?

A: Yes. Automotive-grade parts meet or exceed commercial-grade specifications. The AEC-Q101 qualification ensures reliability across extended temperature ranges and stress conditions. These parts are suitable for any application requiring the specified electrical parameters, though they may represent higher cost than commercial-grade equivalents.

Q: What is the impact of reduced power rating (225 mW vs. 350 mW)?

A: Power rating determines the maximum continuous power dissipation the diode can handle. MMBZ5230BLT1G (225 mW) is suitable for applications where calculated power dissipation does not exceed 225 mW. If your application requires higher power dissipation, select parts rated for 350 mW (MMBZ5230B-7-F, CMPZ5230B TR PBFREE, MMBZ5230B-TP, BZX84C4V7-TP).

Q: Does the operating temperature range affect substitution compatibility?

A: The original MMBZ5230B-7 operates from -65°C to 150°C. Substitutes with -55°C to 150°C range (MMBZ5230B-TP, BZX84C4V7-TP) are suitable for applications not requiring operation below -55°C. For applications requiring full -65°C to 150°C operation, select parts with matching temperature range.

Q: What is the significance of voltage tolerance (±5%, ±2%, ±1%)?

A: Voltage tolerance specifies the allowable deviation from the nominal 4.7 V zener voltage. Tighter tolerance (±1%) provides more precise voltage regulation. The original part and most substitutes use ±5% tolerance, which is standard for general-purpose applications. Automotive-grade parts offer ±1% to ±2% tolerance for applications requiring tighter voltage control.

Q: Are all listed parts pin-compatible with the original MMBZ5230B-7?

A: All listed parts use SOT-23-3 or TO-236AB packaging, which are physically and electrically compatible. Pin configuration is identical across all variants. Physical placement on the PCB is interchangeable without modification.

Q: What does RoHS3 compliance mean for substitution?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead and other hazardous materials. The original MMBZ5230B-7 is RoHS non-compliant. For designs requiring regulatory compliance with environmental standards, select ROHS3-compliant substitutes (MMBZ5230B-7-F, BZX84-A4V7,215, BZX84-B4V7,215, BZX84C4V7-TP, MMBZ5230B-TP, MMBZ5230BLT1G, CMPZ5230B TR PBFREE).

Q: Can I use BZX84C4V7-TP as a substitute if my circuit requires 19 Ohms impedance?

A: BZX84C4V7-TP has 80 Ohms impedance compared to the original 19 Ohms. This higher impedance results in different voltage regulation characteristics. If your circuit design depends on the 19 Ohms impedance specification, select substitutes with matching impedance: MMBZ5230B-7-F, MMBZ5230B-TP, MMBZ5230BLT1G, or CMPZ5230B TR PBFREE.

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