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Diodes Incorporated MMBZ5226BW-7
- Part No.:
- MMBZ5226BW-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
MMBZ5226BW-7.pdf
- Description:
- DIODE ZENER 3.3V 200MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:8,585
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Product details
Overview
MMBZ5226BW-7 from Diodes Incorporated is a 3.3 V, 200 mW surface-mount Zener diode in SOT323 package, rated for 20 mA test current with 28 Ω zener impedance at 20 mA and 25 μA reverse leakage at 1.0 V reverse bias. It serves as a precision voltage reference or overvoltage clamp in low-power analog signal conditioning and power rail regulation circuits.
For engineers reviewing the MMBZ5226BW-7 datasheet, MMBZ5226BW-7 pinout, MMBZ5226BW-7 application, or MMBZ5226BW-7 equivalent, key selection criteria include nominal zener voltage tolerance (±3.6%), thermal resistance (625 °C/W), AEC-Q101 qualification, lead-free/Green compliance, and SOT323 footprint compatibility with automated assembly.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage across its terminals under controlled current conditions. Its 3.3 V nominal zener voltage is specified at 20 mA test current, with tight ±3.6% tolerance (3.14–3.47 V) and low dynamic impedance (28 Ω at 20 mA, 1600 Ω at 0.25 mA).
Designed for ambient temperatures from –65 °C to +150 °C, it delivers consistent regulation in space-constrained PCB layouts. The device uses matte tin-plated Alloy 42 leads and green molding compound compliant with RoHS, halogen-free, and antimony-free requirements per Diodes Incorporated's "Green" definition.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 3.3 V ±3.6% (3.14–3.47 V at IZT = 20 mA) |
| Power Dissipation | 200 mW maximum at TA = 25 °C; derates linearly above 25 °C (625 °C/W θJA) |
| Zener Impedance | 28 Ω at 20 mA; 1600 Ω at 0.25 mA - defines regulation stiffness under varying load |
| Reverse Leakage Current | 25 μA max at VR = 1.0 V - ensures minimal quiescent current in standby clamping |
| Forward Voltage | 0.9 V at IF = 10 mA - relevant for polarity verification and ESD protection path design |
| Package | SOT323 - 3-pin, 2.1 mm × 1.3 mm footprint compatible with high-density routing and reflow soldering |
Pinout & Package
SOT323 package with three terminals: anode, cathode, and exposed pad (non-electrical). Cathode marked by band on top surface; pin 1 = anode, pin 2 = cathode, pin 3 = unused (internal die attach pad, electrically isolated).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Current entry terminal in forward bias | Connected to lower-potential node during clamping; used for polarity identification and layout orientation |
| Cathode (Pin 2) | Current exit terminal in reverse breakdown | Connected to regulated node; carries full zener current during voltage reference operation |
| Exposed Pad (Pin 3) | Thermal relief / mechanical anchor | Non-electrical; improves heat dissipation when soldered to copper pour; no circuit connection required |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified reliability | Validated for automotive-grade temperature cycling, humidity, and mechanical stress per JESD22 standards |
| Lead-free & Green construction | Meets EU RoHS 2011/65/EU; <900 ppm Br, <900 ppm Cl, <1000 ppm Sb - supports eco-compliant manufacturing |
| Low-profile SOT323 package | Height ≤ 0.9 mm; enables stacking under connectors or beneath shields in ultra-thin modules |
| Automated assembly optimized | Matte tin finish, J-STD-020D Level 1 moisture sensitivity, and standardized tape-and-reel packaging (3000/reel) |
Applications
| Industrial Sensor Signal Conditioning | USB Port Overvoltage Protection |
|---|---|
Use Scenario: Stabilizing reference voltage for 12-bit ADCs in temperature/humidity transmitters operating from 3.3 V rails. IC Role / Device Role / Timing Role: Precision shunt voltage reference providing stable 3.3 V bias for op-amp input stages and sensor excitation. Use Value: Maintains ±0.1% reference stability over –40 °C to +85 °C due to low tempco and tight VZ tolerance. | Use Scenario: Clamping transient surges on USB D+ and D− lines caused by ESD or hot-plug events. IC Role / Device Role / Timing Role: Bidirectional transient voltage suppressor placed between data line and ground. Use Value: Limits voltage to ≤3.6 V during 8 kV HBM ESD events without latch-up, preserving USB 2.0 signal integrity. |
| Low-Power IoT Node Power Management | Programmable Logic Supply Rail Clamp |
Use Scenario: Regulating auxiliary 3.3 V supply for BLE SoCs and EEPROMs in battery-powered asset trackers. IC Role / Device Role / Timing Role: Shunt regulator maintaining clean 3.3 V from unregulated 3.6–4.2 V Li-ion source. Use Value: Draws only 25 μA leakage at 1.0 V reverse bias, extending shelf life of coin-cell-backed firmware storage. | Use Scenario: Protecting FPGA configuration pins against overvoltage during board bring-up or firmware update. IC Role / Device Role / Timing Role: Input clamp limiting pin voltage to 3.3 V ±0.3 V during programming voltage mismatches. Use Value: Prevents gate oxide damage in 3.3 V I/O cells with fast response (<1 ns) and sub-100 pF capacitance. |
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-C3V3 | Same 3.3 V nominal, but 350 mW rating and SOT23 package; higher thermal resistance (500 °C/W) | Higher power handling suits intermittent surge clamping; larger footprint limits high-density designs | Select when >200 mW pulse energy absorption is required and board area permits SOT23 |
| MMSZ5226ET1G | Identical 3.3 V spec, same SOT323 package, but rated for 500 mW and has 20 Ω ZZT at 20 mA | Higher power rating allows sustained regulation under heavier loads; tighter impedance improves line regulation | Choose for continuous 3.3 V reference in industrial controllers where thermal margin is critical |
Compared with BZX84-C3V3 and MMSZ5226ET1G, MMBZ5226BW-7 offers optimal balance of AEC-Q101 qualification, ultra-low leakage (25 μA), and compact SOT323 size-making it preferred for automotive sensor modules and space-constrained IoT nodes where reliability and footprint are prioritized over peak power.
Availability
MMBZ5226BW-7 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, USB port overvoltage protection, and low-power IoT node power management requiring stable component supply and automotive-grade reliability.
Supply support for MMBZ5226BW-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 consumer markets.
The MMBZ52xxBW series belongs to Diodes' AEC-Q101-qualified Zener diode portfolio, engineered specifically for precision voltage reference and transient suppression in harsh-environment electronics where long-term stability and process consistency are critical.
FAQ
What is the maximum reverse voltage before breakdown for MMBZ5226BW-7?
The nominal zener voltage is 3.3 V, with guaranteed breakdown occurring between 3.14 V and 3.47 V at 20 mA test current. Below 3.14 V, reverse leakage remains ≤25 μA at 1.0 V; no hard "maximum reverse voltage" is defined outside this range-operation below VZ(min) yields only leakage current.
Can MMBZ5226BW-7 be used in place of a 3.3 V LDO regulator?
No-it functions only as a shunt regulator and requires a series current-limiting resistor to set operating current. Unlike an LDO, it cannot source load current or maintain regulation under variable load; it is suitable only for low-current reference or clamping, not active voltage regulation.
Is the exposed pad on the SOT323 package electrically connected?
No-the exposed pad (Pin 3) is a non-electrical thermal relief structure. It is internally isolated from both anode and cathode and must not be connected to any net. Soldering it to a copper pour improves thermal performance but introduces no electrical function.
Does MMBZ5226BW-7 meet automotive qualification requirements?
Yes-it is explicitly qualified to AEC-Q101 standards, including temperature cycling, high-temperature operating life, and mechanical shock testing. This certification covers operation from –65 °C to +150 °C and validates suitability for under-hood and infotainment applications.
MMBZ5226BW-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):
- 3.3 V
- Tolerance:
- ±5%
- Power - Max:
- 200 mW
- Impedance (Max) (Zzt):
- 28 Ohms
- Current - Reverse Leakage @ Vr:
- 25 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
MMBZ5226BW-7 FAQ
1.How can I place an order for MMBZ5226BW-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5226BW-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 MMBZ5226BW-7 reliable?
The price and inventory of MMBZ5226BW-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5226BW-7 is usually 5 days.
3.What payment methods are accepted for MMBZ5226BW-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5226BW-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5226BW-7?
MMBZ5226BW-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5226BW-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 MMBZ5226BW-7?
For technical support, including MMBZ5226BW-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5226BW-7 requirements.
6.How does Aetrix verify that MMBZ5226BW-7 is sourced from the original manufacturer or authorized distributors?
All MMBZ5226BW-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 MMBZ5226BW-7 meets industry standards.
7.What is the process for return or replacement of MMBZ5226BW-7?
All MMBZ5226BW-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5226BW-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 MMBZ5226BW-7 part is unused and in its original packaging.
Return procedure for MMBZ5226BW-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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