MMBZ5229BW-7-F Equivalent & Substitute Parts

Part Overview

The MMBZ5229BW-7-F is a surface mount Zener diode manufactured by Diodes Incorporated, rated at 4.3 V nominal with 200 mW maximum power dissipation in a SOT-23-3 package. This component is classified as Active product status and is ROHS3 compliant. Substitute parts are identified based on matching electrical specifications and mechanical compatibility within the SOT-23-3 package family, enabling direct replacement in circuit applications where the primary part is unavailable or where alternative sourcing is required.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	4.3	V
Tolerance	±4.99%	%
Power - Max	200	mW
Impedance (Max)	22	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 1 V
Voltage - Forward (Vf) (Max) @ If	900	mV @ 10 mA
Operating Temperature	-65 to 150	°C (TJ)
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the MMBZ5229BW-7-F are selected based on the following critical parameters:

Electrical Matching Criteria:

Zener voltage: 4.3 V nominal
Package compatibility: SOT-23-3 / TO-236-3 / SC-59 surface mount
Operating temperature range: -65°C to 150°C
Forward voltage: 900 mV @ 10 mA
Reverse leakage current: ≤5 µA @ 1 V

Acceptable Variations:

Power dissipation: 200 mW minimum (higher ratings acceptable for thermal margin)
Impedance: 22 Ohms nominal (variations up to 90 Ohms acceptable within zener diode specifications)
Tolerance: ±4.99% to ±7% (voltage regulation performance within acceptable range)
Packaging format: Tape & Reel (TR), Cut Tape (CT), or Bulk configurations

All substitute parts maintain identical pinout, thermal characteristics, and compliance certifications (ROHS3, REACH Unaffected, EAR99).

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power Max	Zzt (Max)	Ir @ Vr	Vf (Max)	Temp Range	Package	RoHS
MMBZ5229BW-7-F	Diodes Incorporated	4.3 V	±4.99%	200 mW	22 Ω	5 µA @ 1 V	900 mV @ 10 mA	-65 to 150°C	SOT-23-3	ROHS3
BZX84-A4V3,215	NXP Semiconductors	4.3 V	±1%	250 mW	90 Ω	3 µA @ 1 V	900 mV @ 10 mA	-65 to 150°C	TO-236AB	ROHS3
BZX84C4V3 TR PBFREE	Central Semiconductor Corp	4.3 V	±5%	350 mW	90 Ω	3 µA @ 1 V	900 mV @ 10 mA	-65 to 150°C	SOT-23	ROHS3
BZX84C4V3LT1G	onsemi	4.3 V	±7%	225 mW	90 Ω	3 µA @ 1 V	900 mV @ 10 mA	-65 to 150°C	SOT-23-3	ROHS3
CMPZ5229B TR PBFREE	Central Semiconductor Corp	4.3 V	±5%	350 mW	22 Ω	5 µA @ 1 V	900 mV @ 10 mA	-65 to 150°C	SOT-23	ROHS3
SZBZX84C4V3LT1G	onsemi	4.3 V	±7%	225 mW	90 Ω	3 µA @ 1 V	900 mV @ 10 mA	-65 to 150°C	SOT-23-3	ROHS3

Engineering Selection Recommendations

Direct Substitutes (Highest Compatibility):

BZX84C4V3LT1G and SZBZX84C4V3LT1G maintain identical package designation (SOT-23-3), operating temperature range, and forward voltage characteristics. Both are Active product status with ROHS3 compliance. The SZBZX84C4V3LT1G carries AEC-Q101 automotive qualification, suitable for applications requiring automotive-grade reliability.

Compatible Substitutes (Acceptable Variations):

BZX84-A4V3,215 (NXP Semiconductors) offers superior voltage tolerance (±1%) and increased power rating (250 mW) with AEC-Q101 qualification. Package designation is TO-236AB, which is mechanically and electrically equivalent to SOT-23-3 within the TO-236 family.

CMPZ5229B TR PBFREE (Central Semiconductor Corp) provides impedance matching (22 Ohms) identical to the primary part with increased power dissipation (350 mW). Reverse leakage current and impedance characteristics align with the MMBZ5229BW-7-F specification.

BZX84C4V3 TR PBFREE (Central Semiconductor Corp) offers the highest power rating (350 mW) with standard impedance (90 Ohms) and tolerance (±5%), providing thermal margin for demanding applications.

Compliance Status:

All substitute parts maintain ROHS3 compliance, REACH Unaffected status, and Moisture Sensitivity Level 1 (Unlimited). All are classified as Active product status with continuous manufacturing support.

Frequently Asked Questions (FAQ)

Q: Can BZX84-A4V3,215 replace MMBZ5229BW-7-F directly?

A: Yes. Both components share identical zener voltage (4.3 V), forward voltage (900 mV @ 10 mA), and operating temperature range (-65 to 150°C). The TO-236AB package is mechanically and electrically equivalent to SOT-23-3. The NXP part offers tighter tolerance (±1%) and higher power rating (250 mW), making it a suitable direct replacement with improved performance margins.

Q: What is the difference between SOT-23-3 and TO-236AB packages?

A: SOT-23-3 and TO-236AB are equivalent designations for the same three-pin surface mount package. Both refer to the same physical form factor and pinout. Substitution between these designations is valid for this component category.

Q: Are the onsemi parts (BZX84C4V3LT1G and SZBZX84C4V3LT1G) interchangeable?

A: Both onsemi parts share identical electrical specifications (4.3 V, 225 mW, ±7% tolerance, SOT-23-3 package). The SZBZX84C4V3LT1G includes AEC-Q101 automotive qualification. Selection depends on application requirements; the SZBZX84C4V3LT1G is specified for automotive environments.

Q: Why do some substitutes have higher power ratings?

A: Higher power ratings (250 mW, 350 mW) provide thermal margin and allow operation in applications with greater power dissipation. These parts are backward compatible with 200 mW designs and do not require circuit modification.

Q: What is the significance of impedance variation (22 Ohms vs. 90 Ohms)?

A: Impedance affects dynamic resistance and voltage regulation characteristics. The MMBZ5229BW-7-F specifies 22 Ohms maximum impedance. Substitutes with 90 Ohms impedance (BZX84-A4V3,215, BZX84C4V3LT1G, SZBZX84C4V3LT1G) remain within acceptable zener diode specifications and are suitable for general voltage regulation applications. CMPZ5229B TR PBFREE matches the 22 Ohms specification exactly.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification and REACH Unaffected status, meeting environmental and regulatory requirements identical to the primary part.

Q: Which substitute offers the best voltage tolerance?

A: BZX84-A4V3,215 (NXP Semiconductors) provides the tightest tolerance at ±1%, compared to ±4.99% for the primary part. This superior tolerance improves voltage regulation accuracy in precision applications.

Q: Can I use CMPZ5229B TR PBFREE in place of MMBZ5229BW-7-F?

A: Yes. CMPZ5229B TR PBFREE matches the impedance (22 Ohms) and reverse leakage current (5 µA @ 1 V) of the primary part exactly. It offers increased power dissipation (350 mW) and is suitable for direct substitution with enhanced thermal performance.

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