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Diodes Incorporated MMBZ5229B-7-F
- Part No.:
- MMBZ5229B-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5229B-7-F.pdf
- Description:
- DIODE ZENER 4.3V 350MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:15,265
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Product details
Overview
MMBZ5229B-7-F from Diodes Incorporated is a 4.3V ±5% surface-mount Zener diode in SOT23 package, rated for 350mW power dissipation at 25°C, with 22Ω zener impedance at 20mA test current and 5.0µA reverse leakage at 1.0V, used for precision voltage reference and overvoltage protection in low-power analog circuits.
For engineers reviewing the MMBZ5229B-7-F datasheet, MMBZ5229B-7-F pinout, MMBZ5229B-7-F application, or MMBZ5229B-7-F equivalent, this page provides verified electrical parameters, thermal derating behavior, SOT23 terminal mapping, and direct alternatives for voltage-clamping and reference design.
Technical Context
This Zener diode operates in reverse breakdown mode with a nominal zener voltage of 4.3V (min 4.09V, max 4.52V) at 20mA test current. Its 22Ω dynamic impedance at IZT and 2,000Ω at IZK = 0.25mA define regulation sharpness across operating current range.
Thermal resistance is 357°C/W on FR-4 PCB with recommended pad layout; power derating begins linearly above 25°C ambient, reaching zero dissipation at 150°C. Reverse leakage remains ≤5.0µA up to 1.0V, ensuring low standby current in bias networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.3V nominal, 4.09–4.52V range at 20mA - defines stable clamping threshold for 3.3V/5V rail protection |
| Power Dissipation (PD) | 350mW on FR-4 PCB - sets maximum continuous clamp energy without heatsinking |
| Zener Impedance (ZZT) | 22Ω at 20mA - ensures <±25mV output shift under 0.5mA load variation |
| Reverse Leakage (IR) | ≤5.0µA at VR = 1.0V - minimizes quiescent current in high-impedance reference dividers |
| Thermal Resistance (RθJA) | 357°C/W - requires ambient <100°C for full 350mW operation in standard layout |
| Operating Temperature | −65°C to +150°C - supports industrial and automotive under-hood environments |
Pinout & Package
Package: SOT23 - 3-terminal surface-mount plastic package with matte tin-plated Alloy 42 leadframe, JEDEC-compliant footprint, moisture sensitivity level 1, UL 94V-0 rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal | Connected to lower-potential node in reverse-biased configuration; anchors cathode-to-rail clamp topology |
| Cathode (Pin 2) | Zener breakdown terminal | Connected to protected node or reference point; carries full clamp current during overvoltage events |
| No Connect (Pin 3) | Internal die attach flag | Electrically isolated; serves mechanical anchoring only - must remain floating in PCB layout |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Enables tight VZ tolerance (±5%) and repeatable ZZT across production lots |
| 350mW FR-4 power rating | Validated with Diodes' recommended pad layout - no thermal vias required for typical 100ms surge handling |
| Lead-free & RoHS 3 compliant | Fully compliant with EU Directive 2015/863/EU - bromine/chlorine <1500ppm total, antimony <1000ppm |
| SOT23 automated assembly compatibility | Matte tin finish meets MIL-STD-202 solderability spec - supports reflow profiles up to 260°C peak |
Applications
| Microcontroller I/O Protection | Low-Power Sensor Reference |
|---|---|
Use Scenario: Clamping ESD transients on 3.3V GPIO lines of ARM Cortex-M microcontrollers. IC Role / Device Role / Timing Role: Zener acts as fast-acting shunt limiter, diverting >2kV HBM surges before internal protection diodes activate. Use Value: 4.3V breakdown ensures safe margin below 3.6V absolute max I/O rating while maintaining low leakage (<5µA) to avoid signal distortion. |
Use Scenario: Providing stable 4.3V reference for 12-bit ADC in battery-powered environmental sensor nodes. IC Role / Device Role / Timing Role: Functions as passive voltage reference in resistor-divider + op-amp buffer configuration. Use Value: 22Ω ZZT enables <±1 LSB drift over 0–1mA load variation, critical for sub-10mV measurement accuracy. |
| USB Port Overvoltage Clamp | Industrial PLC Input Conditioning |
Use Scenario: Protecting USB 2.0 D+ and D− lines against 12V misconnection in embedded host ports. IC Role / Device Role / Timing Role: Dual-diode arrangement (anode-to-anode) clamps differential and common-mode overvoltage simultaneously. Use Value: 350mW rating sustains 100ms 12V fault without thermal runaway; SOT23 footprint fits tight board spacing near USB connector. |
Use Scenario: Level-shifting and transient suppression for 4–20mA loop-powered field transmitter inputs. IC Role / Device Role / Timing Role: Zener referenced to loop ground establishes precise 4.3V threshold for open-wire detection circuitry. Use Value: −65°C to +150°C operating range ensures reliability in unheated outdoor enclosures; low IR avoids loading 250Ω sense resistor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference and clamping applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C4V3 | Same 4.3V nominal, but 500mW rating on FR-4 and 60Ω ZZT at 5mA - higher power, looser regulation | Preferred where surge energy exceeds 350mW but precision <±1% not required | Select when thermal margin >100°C or cost-per-watt is prioritized over voltage stability |
| MM3Z4V3 | Same 4.3V, 200mW rating, 30Ω ZZT at 5mA, SOD-323 package - smaller footprint, lower power, tighter ZZT at low current | Better suited for space-constrained wearables with <100µA bias currents | Choose for ultra-low-power designs where 200mW limit suffices and board area is premium |
Compared with BZX84-C4V3 and MM3Z4V3, MMBZ5229B-7-F delivers optimal balance of regulation precision (22Ω ZZT), thermal robustness (350mW), and SOT23 manufacturability - making it ideal for industrial control and automotive body electronics requiring AEC-Q200-aligned reliability.
Availability
MMBZ5229B-7-F is available at Aetrix Electronics and suitable for microcontroller I/O protection, low-power sensor reference, and industrial PLC input conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MMBZ5229B-7-F 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 industrial, automotive, and computing markets since 1960.
This device belongs to the MMBZ52xxB series of 350mW Zener diodes engineered for automated SMT assembly, JEDEC-compliant thermal performance, and green manufacturing - targeting cost-sensitive yet reliability-critical voltage reference and protection functions.
FAQ
What is the maximum continuous reverse voltage that MMBZ5229B-7-F can withstand without breakdown?
The MMBZ5229B-7-F has a nominal zener voltage of 4.3V with a guaranteed range of 4.09V to 4.52V at 20mA. Below the minimum breakdown voltage (4.09V), it behaves as a high-impedance reverse-biased diode with ≤5.0µA leakage at 1.0V. Sustained reverse voltage below 4.09V will not cause conduction or damage.
Can MMBZ5229B-7-F be used in place of a 3.3V Zener diode for logic-level clamping?
No - its 4.3V nominal breakdown exceeds the 3.3V rail's absolute maximum rating (typically 3.6V). Using it for 3.3V clamping risks incomplete protection during overvoltage events. For 3.3V systems, MMBZ5226B (3.3V) or MMBZ5227B (3.6V) are appropriate alternatives with verified margin and leakage.
Does MMBZ5229B-7-F require external current limiting in all applications?
Yes - like all Zener diodes, it requires a series current-limiting resistor to prevent thermal runaway. At 350mW max dissipation and 4.3V VZ, the maximum safe continuous current is ~81mA. Resistor value must be selected based on worst-case input voltage and desired operating current (e.g., 5–20mA for stable regulation).
Is MMBZ5229B-7-F qualified for automotive applications per AEC-Q200?
No - the base part number lacks AEC-Q200 qualification. Diodes offers automotive-grade equivalents with Q-suffix (e.g., MMBZ5229BQ-7-F), manufactured in IATF 16949-certified facilities and PPAP-capable. These undergo additional stress testing including temperature cycling, humidity bias, and accelerated life validation.
MMBZ5229B-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 4.3 V
- Tolerance:
- ±5%
- Power - Max:
- 350 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-23-3
MMBZ5229B-7-F FAQ
1.How can I place an order for MMBZ5229B-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5229B-7-F 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 MMBZ5229B-7-F reliable?
The price and inventory of MMBZ5229B-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5229B-7-F is usually 5 days.
3.What payment methods are accepted for MMBZ5229B-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5229B-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5229B-7-F?
MMBZ5229B-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5229B-7-F 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 MMBZ5229B-7-F?
For technical support, including MMBZ5229B-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5229B-7-F requirements.
6.How does Aetrix verify that MMBZ5229B-7-F is sourced from the original manufacturer or authorized distributors?
All MMBZ5229B-7-F 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 MMBZ5229B-7-F meets industry standards.
7.What is the process for return or replacement of MMBZ5229B-7-F?
All MMBZ5229B-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5229B-7-F, 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 MMBZ5229B-7-F part is unused and in its original packaging.
Return procedure for MMBZ5229B-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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