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Diodes Incorporated MMBZ5229BW-7
- Part No.:
- MMBZ5229BW-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
MMBZ5229BW-7.pdf
- Description:
- DIODE ZENER 4.3V 200MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:8,839
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Product details
Overview
MMBZ5229BW-7 from Diodes Incorporated is a 4.3 V, 200 mW surface-mount Zener diode in SOT323 package, with ±5% voltage tolerance (4.09–4.52 V), 22 Ω dynamic impedance at 20 mA test current, and ≤5.0 μA reverse leakage at 1.0 V. It serves as a precision voltage reference or overvoltage clamp in low-power analog signal conditioning circuits.
For engineers reviewing the MMBZ5229BW-7 datasheet, MMBZ5229BW-7 pinout, MMBZ5229BW-7 application, or MMBZ5229BW-7 equivalent, key selection criteria include Zener voltage accuracy, low leakage at low VR, thermal resistance (625 °C/W), and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage regulation across varying load currents. Its 200 mW power rating and 625 °C/W junction-to-ambient thermal resistance define its usable current envelope under ambient conditions.
The device exhibits 22 Ω impedance at 20 mA (IZT) and 2000 Ω at 0.25 mA (IZK), indicating steeper knee characteristics than lower-voltage variants in the MMBZ52xxBW series. Reverse leakage remains ≤5.0 μA up to 1.0 V, supporting low-current biasing in sensor interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Nominal) | 4.3 V - Stable regulation point for 3.3 V/5 V rail monitoring and reference buffering |
| Voltage Tolerance | ±5% (4.09–4.52 V) - Ensures predictable clamping within standard logic-level thresholds |
| Power Dissipation | 200 mW - Supports continuous operation up to ~46 mA at 4.3 V without heatsinking |
| Zener Impedance | 22 Ω @ 20 mA - Low dynamic resistance enables tight regulation under moderate load transients |
| Reverse Leakage | ≤5.0 μA @ 1.0 V - Minimizes error current in high-impedance voltage divider or reference networks |
| Thermal Resistance | 625 °C/W - Requires careful PCB copper area design on FR4 to avoid exceeding 150 °C junction temperature |
| AEC-Q101 Qualified | Yes - Validated for automotive electronics including body control modules and sensor front-ends |
Pinout & Package
Package: SOT323 - 3-terminal plastic surface-mount package with 0.65 mm lead pitch, 2.10 mm × 1.30 mm footprint, and 0.30 mm profile; compatible with standard reflow profiles and automated pick-and-place.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal / Cathode reference ground path | Connected to system ground or lower-potential node when used in shunt regulation |
| Cathode (Pin 2) | Zener breakdown terminal / Voltage reference output | Connected to regulated node; supplies stable 4.3 V when reverse-biased above breakdown |
| Collector / Heat Sink (Pin 3) | Exposed pad / Thermal relief path | Internally tied to cathode; must be soldered to PCB copper pour for thermal management |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive temperature cycling, humidity, and mechanical shock per stress test requirements |
| Green molding compound | Halogen- and antimony-free (<900 ppm Br/Cl, <1000 ppm Sb), UL 94V-0 rated for flame resistance |
| SOT323 package compatibility | Enables high-density layout in space-constrained applications such as portable instrumentation and ECUs |
| Lead-free matte tin plating | Solderable per MIL-STD-202 Method 208; supports Pb-free reflow without dewetting or intermetallic issues |
Applications
| Automotive Sensor Signal Conditioning | Industrial Analog Input Protection |
|---|---|
Use Scenario: Clamping ECU analog inputs from 0–5 V sensors exposed to load dump or ESD events. IC Role / Device Role / Timing Role: Shunt Zener clamp placed between input trace and ground to limit voltage excursion to 4.3 V. Use Value: Prevents op-amp input stage saturation or damage while maintaining signal integrity below 4.3 V. | Use Scenario: Protecting 12-bit ADC reference inputs in programmable logic controllers against overvoltage during field wiring faults. IC Role / Device Role / Timing Role: Precision voltage reference buffer and fault clamp in ratiometric measurement circuits. Use Value: Ensures reference stability within ±0.5% over temperature, reducing calibration drift in 0.1% accuracy systems. |
| USB Port ESD Suppression | Low-Power IoT Node Voltage Reference |
Use Scenario: Secondary protection layer downstream of TVS diodes on USB D+/D− lines in embedded host ports. IC Role / Device Role / Timing Role: Low-capacitance (≈15 pF) Zener clamp limiting line voltage to 4.3 V during fast transients. Use Value: Adds sub-100 ns response tailoring without degrading USB 2.0 signal rise time or eye diagram. | Use Scenario: Providing stable 4.3 V reference for ultra-low-power microcontroller ADCs in battery-operated environmental sensors. IC Role / Device Role / Timing Role: Low-leakage (≤5 μA) shunt reference enabling <1 μA standby current in sleep modes. Use Value: Extends coin-cell battery life beyond 5 years while maintaining 12-bit measurement repeatability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C4V3-7-F | Same 4.3 V nominal, but 350 mW rating and higher ZZT (30 Ω); SOT23 package | Higher power margin allows use in 100 mA surge scenarios; larger footprint limits high-density layouts | Select when thermal headroom >200 mW is required and board space permits SOT23 |
| MMBZ5229BS-7-F | Identical electrical specs, but SOD-323 package (smaller, 1.7 × 1.25 mm) and no AEC-Q101 qualification | Lacks automotive qualification; suitable only for commercial-grade consumer or industrial non-safety systems | Select for cost-sensitive, non-automotive designs where footprint reduction outweighs qualification needs |
Compared with BZX84-C4V3-7-F and MMBZ5229BS-7-F, MMBZ5229BW-7 uniquely balances AEC-Q101 compliance, SOT323 manufacturability, and 4.3 V regulation accuracy-making it optimal for automotive body electronics and industrial control modules requiring validated reliability in compact form factors.
Availability
MMBZ5229BW-7 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial analog input protection, and low-power IoT voltage reference applications requiring stable component supply and long-term lifecycle support.
Supply support for MMBZ5229BW-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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
The MMBZ52xxBW series belongs to Diodes' precision Zener diode product line, engineered specifically for stable voltage referencing and overvoltage protection in space-constrained, high-reliability applications including automotive, industrial, and communications equipment.
FAQ
What is the maximum continuous reverse current this Zener can handle at 4.3 V?
At 4.3 V, the MMBZ5229BW-7 supports up to ~46 mA continuous current before reaching its 200 mW power limit (P = V × I). Derating is required above +25°C ambient per the published power derating curve-e.g., only ~25 mA at +85°C ambient on standard FR4.
Is the SOT323 package lead-free and RoHS compliant?
Yes. The MMBZ5229BW-7 uses matte tin-plated Alloy 42 leads and halogen/antimony-free green molding compound, fully complying with EU RoHS Directive 2011/65/EU and achieving UL 94V-0 flammability rating.
How does its Zener impedance compare to the MMBZ5230BW-7 (4.7 V variant)?
The MMBZ5229BW-7 has 22 Ω impedance at 20 mA, while the MMBZ5230BW-7 specifies 19 Ω-reflecting improved regulation sharpness at higher Zener voltages due to lower series resistance in the silicon structure.
Can this part replace a 1N4733A in an existing design?
No-1N4733A is a 5.1 V, 1 W through-hole Zener. MMBZ5229BW-7 is 4.3 V, 200 mW, and SMT-only. Direct substitution would cause incorrect regulation voltage and insufficient power handling; redesign of biasing and layout is required.
MMBZ5229BW-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 4.3 V
- Tolerance:
- ±5%
- Power - Max:
- 200 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:
- SOT-323
MMBZ5229BW-7 FAQ
1.How can I place an order for MMBZ5229BW-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5229BW-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 MMBZ5229BW-7 reliable?
The price and inventory of MMBZ5229BW-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5229BW-7 is usually 5 days.
3.What payment methods are accepted for MMBZ5229BW-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5229BW-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5229BW-7?
MMBZ5229BW-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5229BW-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 MMBZ5229BW-7?
For technical support, including MMBZ5229BW-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5229BW-7 requirements.
6.How does Aetrix verify that MMBZ5229BW-7 is sourced from the original manufacturer or authorized distributors?
All MMBZ5229BW-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 MMBZ5229BW-7 meets industry standards.
7.What is the process for return or replacement of MMBZ5229BW-7?
All MMBZ5229BW-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5229BW-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 MMBZ5229BW-7 part is unused and in its original packaging.
Return procedure for MMBZ5229BW-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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