MMSZ5229C-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The MMSZ5229C-TP is a 4.3 V, 500 mW Zener diode manufactured by Micro Commercial Co in SOD-123 surface mount packaging. This component is classified as an interface diode and maintains Active product status. The part is supplied in Bulk packaging and is currently in stock with 726 units available.

Substitute parts become necessary when the primary part reaches end-of-life status, experiences supply constraints, or when design requirements permit alternative manufacturers with equivalent electrical and mechanical specifications. The substitute parts listed maintain the same nominal Zener voltage, power rating, and package configuration while potentially offering different tolerance grades, impedance characteristics, or temperature operating ranges.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	4.3	V
Tolerance	±2%	—
Power - Max	500	mW
Impedance (Max)	22	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 1 V
Voltage - Forward (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 compatibility for the MMSZ5229C-TP is determined by the following critical parameters:

Primary Substitution Criteria:

Nominal Zener voltage of 4.3 V
Surface mount SOD-123 package configuration
Maximum power dissipation of 500 mW or greater
Operating temperature range encompassing -55°C to 150°C or equivalent

Secondary Compatibility Factors:

Zener voltage tolerance (±2% preferred, but ±5% and ±7% acceptable with design verification)
Impedance characteristics (22 Ohms nominal, up to 95 Ohms acceptable)
Reverse leakage current specifications (3 to 5 µA @ 1 V acceptable)
Forward voltage characteristics (900 mV @ 10 mA)

Parts are grouped into three categories: Direct equivalents (identical specifications), compatible substitutes (same voltage and power with tolerance or impedance variations), and conditional substitutes (lower power ratings or different temperature ranges requiring application review).

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Temp Range	Status
MMSZ5229C-TP	Micro Commercial Co	4.3 V	±2%	500 mW	22 Ω	-55 to 150°C	Active
MMSZ5229C-E3-08	Vishay General Semiconductor	4.3 V	±2%	500 mW	22 Ω	-55 to 150°C	Active
MMSZ4687-E3-08	Vishay General Semiconductor	4.3 V	±5%	500 mW	—	-55 to 150°C	Active
MMSZ4V3T1G	onsemi	4.3 V	±5%	500 mW	90 Ω	-55 to 150°C	Active
MMSZ5229B-7-F	Diodes Incorporated	4.3 V	±5%	500 mW	22 Ω	-65 to 150°C	Active
MMSZ5229B-HE3-08	Vishay General Semiconductor	4.3 V	±5%	500 mW	22 Ω	-55 to 150°C	Obsolete
CMHZ5229B TR PBFREE	Central Semiconductor Corp	4.3 V	±5%	500 mW	22 Ω	-55 to 150°C	Active
BZT52C4V3-7-F	Diodes Incorporated	4.3 V	±7%	500 mW	90 Ω	-65 to 150°C	Active
BZT52C4V3-E3-08	Vishay General Semiconductor	4.3 V	±5%	410 mW	95 Ω	-55 to 150°C	Active
BZT52C4V3-E3-18	Vishay General Semiconductor	4.3 V	±5%	410 mW	95 Ω	-55 to 150°C	Active
BZT52B4V3-HE3-08	Vishay General Semiconductor	4.3 V	±2%	410 mW	90 Ω	-55 to 150°C	Obsolete

Engineering Selection Recommendations

Tier 1: Direct Equivalents (Preferred)

MMSZ5229C-E3-08 from Vishay General Semiconductor is the primary direct equivalent. This part maintains identical electrical specifications: 4.3 V nominal Zener voltage, ±2% tolerance, 500 mW maximum power, and 22 Ohms maximum impedance. Operating temperature range matches the original part (-55°C to 150°C). The part is Active status with 35,100 units in stock. Packaging is available in Tape & Reel (TR) format with RoHS3 compliance and MSL 1 rating.

Tier 2: Compatible Substitutes (Electrical Equivalence with Parameter Variations)

MMSZ4687-E3-08 (Vishay) and MMSZ4V3T1G (onsemi) maintain 4.3 V nominal voltage and 500 mW power rating with ±5% tolerance. Both are Active status parts with full temperature range coverage. MMSZ4687-E3-08 offers 15,100 units in stock. MMSZ4V3T1G provides 2,506 units with 90 Ohms impedance specification.

MMSZ5229B-7-F (Diodes Incorporated) and CMHZ5229B TR PBFREE (Central Semiconductor) both deliver 500 mW power with 4.3 V nominal voltage and 22 Ohms impedance. MMSZ5229B-7-F extends temperature range to -65°C minimum with 8,633 units available. CMHZ5229B TR PBFREE provides 13,671 units with ±5% tolerance.

Tier 3: Conditional Substitutes (Power or Impedance Derating)

BZT52C4V3-E3-08 and BZT52C4V3-E3-18 (Vishay) reduce maximum power to 410 mW with increased impedance (95 Ohms). These parts are suitable only for applications where 410 mW dissipation is acceptable. Both maintain 4.3 V nominal voltage and -55°C to 150°C operating range with Active status.

BZT52C4V3-7-F (Diodes Incorporated) offers 500 mW power but with ±7% tolerance and 90 Ohms impedance. Extended temperature range to -65°C is available. This part is Active with 53,400 units in stock.

Obsolete Parts (Not Recommended for New Designs)

MMSZ5229B-HE3-08 and BZT52B4V3-HE3-08 are marked Obsolete. MMSZ5229B-HE3-08 carries AEC-Q101 automotive qualification. These parts should not be selected for new designs but may be used for legacy system maintenance where existing inventory exists.

Frequently Asked Questions (FAQ)

Q: Can MMSZ5229C-E3-08 be used as a direct replacement for MMSZ5229C-TP?

A: Yes. MMSZ5229C-E3-08 is a direct electrical and mechanical equivalent. Both parts specify 4.3 V nominal Zener voltage, ±2% tolerance, 500 mW maximum power, 22 Ohms impedance, and -55°C to 150°C operating temperature. The primary difference is packaging format: MMSZ5229C-TP is supplied in Bulk, while MMSZ5229C-E3-08 is supplied in Tape & Reel (TR). Both use SOD-123 surface mount package.

Q: What is the difference between ±2% and ±5% tolerance parts?

A: Tolerance specifies the allowable deviation of the Zener voltage from the nominal 4.3 V specification. A ±2% part (MMSZ5229C-TP, MMSZ5229C-E3-08) maintains voltage between 4.214 V and 4.386 V. A ±5% part (MMSZ4687-E3-08, MMSZ4V3T1G) maintains voltage between 4.085 V and 4.515 V. Applications requiring tighter voltage regulation must use ±2% parts.

Q: Can I use BZT52C4V3-E3-08 (410 mW) instead of MMSZ5229C-TP (500 mW)?

A: BZT52C4V3-E3-08 can be used only if the application's maximum power dissipation does not exceed 410 mW. The 90 mW reduction in power rating limits thermal headroom. Verify that circuit conditions do not require the full 500 mW capability before substitution.

Q: What does impedance (Zzt) mean in Zener diode specifications?

A: Impedance (Zzt) is the dynamic resistance of the Zener diode in the reverse breakdown region. Lower impedance (22 Ohms) provides better voltage regulation and lower output impedance. Higher impedance (90-95 Ohms) results in greater voltage variation with load current changes. MMSZ5229C-TP specifies 22 Ohms; parts with 90-95 Ohms impedance exhibit different regulation characteristics.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed carry RoHS3 compliance status. All parts also maintain REACH Unaffected status and MSL 1 (Unlimited) moisture sensitivity level, indicating compatibility with standard PCB assembly processes.

Q: What is the significance of AEC-Q101 qualification on MMSZ5229B-HE3-08?

A: AEC-Q101 is an automotive qualification standard for discrete semiconductors. MMSZ5229B-HE3-08 meets automotive reliability and testing requirements. However, this part is Obsolete and should not be selected for new designs. For automotive applications requiring AEC-Q101 qualification, consult with manufacturers for current qualified alternatives.

Q: Can I mix different manufacturers' parts in the same circuit board?

A: Yes. All substitute parts maintain identical nominal Zener voltage (4.3 V) and package configuration (SOD-123). Electrical performance differences are limited to tolerance, impedance, and leakage current specifications. Verify that the specific tolerance and impedance characteristics of each manufacturer's part meet circuit requirements before mixing.

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

A: Cut Tape (CT) packaging supplies components on tape that has been cut into smaller sections, typically for lower-volume orders. Tape & Reel (TR) supplies components on continuous tape wound on reels, suitable for automated assembly equipment. Both formats use the same SOD-123 component package. MMSZ5229C-TP is supplied in Bulk; MMSZ5229C-E3-08 is available in TR format.

Q: Why does BZT52C4V3-7-F have ±7% tolerance while most others specify ±2% or ±5%?

A: Tolerance is determined by manufacturing process and quality control specifications. BZT52C4V3-7-F's ±7% tolerance indicates a wider acceptable voltage range (4.001 V to 4.599 V). This part is suitable for applications where voltage regulation is less critical. For precision voltage reference applications, select ±2% parts.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message