My Inquiry
My Account
Diodes Incorporated MMSZ5229B-7
- Part No.:
- MMSZ5229B-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5229B-7.pdf
- Description:
- DIODE ZENER 4.3V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:6,354
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MMSZ5229B-7 from Diodes Incorporated is a 4.3 V, 500 mW surface-mount Zener diode in SOD-123 package, rated for 20 mA test current, 22 Ω zener impedance at 20 mA, and 5.0 µA reverse leakage at 1.0 V, used for voltage regulation and reference in low-power analog circuits.
For engineers reviewing the MMSZ5229B-7 datasheet, MMSZ5229B-7 pinout, MMSZ5229B-7 application, or MMSZ5229B-7 equivalent, this part serves as a precision low-voltage shunt regulator with AEC-Q101 qualification, RoHS-compliant green packaging, and stable thermal performance up to +150°C junction temperature.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain a stable 4.3 V reference across its terminals under controlled current conditions. It exhibits a nominal temperature coefficient of approximately −0.05 %/°C (inferred from Figure 6 for 4.3 V devices), and delivers regulated output with ≤22 Ω dynamic impedance at IZT = 20 mA.
The device is designed for use in compact PCB layouts requiring automated assembly compatibility, with a cathode band polarity marker and matte tin-plated alloy-42 leads solderable per MIL-STD-202. Its SOD-123 package supports thermal dissipation of 370 mW at +25°C ambient and derates linearly to 500 mW at +75°C lead temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.3 V nominal, 4.09–4.52 V range at 20 mA - defines stable regulation point for low-voltage references. |
| Power Dissipation (PD) | 370 mW @ TA = +25°C - sets maximum continuous power in standard PCB layout without forced cooling. |
| Zener Impedance (ZZT) | 22 Ω @ IZT = 20 mA - determines output voltage stability under load variation. |
| Reverse Leakage (IR) | 5.0 µA @ VR = 1.0 V - ensures minimal quiescent current in standby or bias networks. |
| Operating Temperature | −65°C to +150°C - enables deployment in automotive under-hood and industrial control environments. |
| Package | SOD-123 - surface-mount footprint compatible with high-volume pick-and-place assembly and reflow profiles. |
Pinout & Package
Two-terminal device in SOD-123 package: anode and cathode marked by cathode band on body. No internal pin numbering; terminals are unidirectional with polarity critical for proper Zener operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to circuit common; reverse-biased configuration requires cathode at higher potential. |
| Cathode | Regulated voltage node | Marked with band; supplies stable 4.3 V when current flows from cathode to anode through external resistor. |
Key Features
| Feature | Design Value |
|---|---|
| 500 mW power rating at TL = +75°C | Enables higher transient power handling in thermally constrained designs with adequate lead heat sinking. |
| AEC-Q101 qualified | Validated for automotive applications including body electronics and infotainment power rails. |
| Halogen- and antimony-free "Green" compound | Meets strict environmental compliance (Br+Cl <1500 ppm, Sb <1000 ppm) without compromising mold integrity. |
| Moisture Sensitivity Level 1 | Eliminates bake requirements prior to reflow, reducing manufacturing cost and process complexity. |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Providing stable 4.3 V reference for ADC biasing or op-amp feedback networks in battery-powered sensors. IC Role / Device Role / Timing Role: Shunt voltage reference maintaining accuracy despite supply ripple or load transients. Use Value: Enables ±2% regulation tolerance over temperature and current variation, supporting 12-bit measurement fidelity. |
Use Scenario: Protecting microcontroller I/O pins from ESD-induced voltage spikes exceeding 5 V. IC Role / Device Role / Timing Role: Fast-acting clamping element diverting surge current before damage occurs. Use Value: Limits transient voltage to ≤4.52 V (max VZ) while sustaining <5 µA leakage during normal operation. |
| Low-Power Voltage Monitor | Automotive Cabin Control |
Use Scenario: Detecting brown-out conditions in 5 V rail by comparing against 4.3 V Zener threshold via comparator input. IC Role / Device Role / Timing Role: Precision threshold generator defining system reset boundary. Use Value: Delivers repeatable trip point with <±0.23 V tolerance across −40°C to +125°C operating range. |
Use Scenario: Regulating auxiliary 4.3 V supply for HVAC display backlight drivers in passenger compartment modules. IC Role / Device Role / Timing Role: Primary shunt regulator in non-isolated DC-DC post-regulation stage. Use Value: Qualified to AEC-Q101 and rated for 150°C junction temperature, ensuring reliability in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584-C4V3 | Same 4.3 V nominal, but SOD-323 package (smaller footprint, lower thermal mass) | Lower power rating (300 mW), unsuitable for >15 mA continuous operation | Select when board space is critical and power demand stays below 12 mA. |
| MM3Z4V3 | 4.3 V, SOD-323, 200 mW rating, tighter VZ tolerance (±2%) | Not AEC-Q101 qualified; limited to commercial-grade consumer applications | Choose for cost-sensitive, non-automotive designs where tighter initial tolerance outweighs reliability requirements. |
Compared with BZX584-C4V3 and MM3Z4V3, MMSZ5229B-7 offers superior thermal robustness (370 mW @ 25°C), automotive qualification, and proven long-term stability in harsh environments-making it optimal for safety-critical or high-reliability deployments.
Availability
MMSZ5229B-7 is available at Aetrix Electronics and suitable for automotive cabin control systems, industrial sensor signal conditioning, and battery-powered portable instrumentation requiring stable component supply and full traceability.
Supply support for MMSZ5229B-7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability components for automotive, industrial, and computing markets.
The MMSZ52xxB series targets cost-effective, high-volume Zener regulation needs in space-constrained applications, emphasizing AEC-Q101 compliance, green materials, and automated assembly readiness.
FAQ
What is the maximum continuous Zener current for MMSZ5229B-7 at room temperature?
The device supports up to 20 mA test current with stable 4.3 V regulation, and can sustain ~85 mA peak current before exceeding its 370 mW ambient-rated power limit at +25°C. Derating applies above +25°C per Figure 1's linear curve.
Is MMSZ5229B-7 suitable for use in automotive under-hood applications?
Yes - it is AEC-Q101 qualified and rated for −65°C to +150°C operating temperature. Its SOD-123 package and green molding compound meet automotive thermal cycling and chemical resistance requirements for engine control and lighting modules.
How does the cathode band orientation affect circuit functionality?
The cathode band identifies the cathode terminal; correct orientation is essential for reverse-bias operation. If installed backward, the device behaves as a forward-biased diode (~0.9 V drop), failing to regulate and potentially overheating under intended Zener current.
Can MMSZ5229B-7 replace older MMSZ5229 versions without design changes?
Yes - the "B" suffix denotes tightened VZ tolerance and updated green material compliance. Electrical characteristics, package dimensions, and thermal behavior are identical to legacy MMSZ5229, enabling drop-in replacement in existing layouts.
MMSZ5229B-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 4.3 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 22 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 1 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
MMSZ5229B-7 FAQ
1.How can I place an order for MMSZ5229B-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5229B-7 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MMSZ5229B-7 reliable?
The price and inventory of MMSZ5229B-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5229B-7 is usually 5 days.
3.What payment methods are accepted for MMSZ5229B-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5229B-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5229B-7?
MMSZ5229B-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5229B-7 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MMSZ5229B-7?
For technical support, including MMSZ5229B-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5229B-7 requirements.
6.How does Aetrix verify that MMSZ5229B-7 is sourced from the original manufacturer or authorized distributors?
All MMSZ5229B-7 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MMSZ5229B-7 meets industry standards.
7.What is the process for return or replacement of MMSZ5229B-7?
All MMSZ5229B-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5229B-7, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MMSZ5229B-7 part is unused and in its original packaging.
Return procedure for MMSZ5229B-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMSZ5229B-7 Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
