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Diodes Incorporated MMBZ5229BT-7-F
- Part No.:
- MMBZ5229BT-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOT-523
- Datasheet:
-
MMBZ5229BT-7-F.pdf
- Description:
- DIODE ZENER 4.3V 150MW SOT523
- Quantity:
- Payment:
- Shipping:
Inventory:5,649
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Product details
Overview
MMBZ5229BT-7-F from Diodes Incorporated is a 4.3 V, 150 mW surface-mount Zener diode in SOT-523 package, rated for 20 mA test current, 22 Ω dynamic impedance at 1 kHz, and 5.0 μA reverse leakage at 1.0 V reverse bias; used for precision voltage reference and overvoltage protection in low-power sensor signal conditioning circuits.
For engineers reviewing the MMBZ5229BT-7-F datasheet, MMBZ5229BT-7-F pinout, MMBZ5229BT-7-F application, or MMBZ5229BT-7-F equivalent, key selection criteria include nominal Zener voltage tolerance (±5%), thermal resistance (833 °C/W), low capacitance (<10 pF), RoHS-compliant matte tin plating, and compatibility with automated SMT assembly on FR-4 PCBs.
Technical Context
This device operates as a two-terminal voltage-regulating element using planar silicon junction technology. It maintains stable reverse breakdown at 4.3 V with ±5% tolerance across 20 mA test current and exhibits low dynamic impedance (22 Ω) to minimize output voltage variation under load transients.
Designed for ambient temperatures from –65 °C to +150 °C, it delivers consistent regulation in space-constrained applications where thermal dissipation is limited by its 150 mW power rating and high RθJA of 833 °C/W on standard FR-4 layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.3 V nominal, 4.09–4.52 V min/max - ensures stable reference within ±5% at 20 mA |
| Power Dissipation (PD) | 150 mW - limits continuous operating current to ~35 mA at 4.3 V on standard FR-4 |
| Zener Impedance (ZZT) | 22 Ω at 1 kHz - reduces output ripple and improves regulation under dynamic load changes |
| Reverse Leakage (IR) | 5.0 μA at VR = 1.0 V - enables low-quiescent-current biasing in battery-powered circuits |
| Thermal Resistance (RθJA) | 833 °C/W - requires careful PCB copper area planning to avoid junction overheating above 85 °C ambient |
| Package | SOT-523 - 1.6 mm × 0.8 mm footprint supports high-density routing in wearables and IoT nodes |
Pinout & Package
Package: SOT-523 - ultra-small plastic surface-mount case (1.60 × 0.80 × 0.50 mm), UL 94V-0 rated, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal | Connected to lower-potential node during reverse-bias operation; polarity must match PCB silkscreen marking "K" |
| Cathode (Pin 2) | Zener breakdown terminal | Connected to higher-potential node; carries regulated voltage output when reverse biased above 4.3 V |
| Case / Exposed Pad | Non-electrical mechanical anchor | No internal connection; serves only for thermal and mechanical stability - not a ground or thermal path |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SOT-523 footprint | Enables placement in <1.0 mm² board area - critical for miniaturized medical sensors and hearing aids |
| Planar die construction | Delivers tight Zener voltage distribution (±5%) and stable long-term drift <1% over 1000 hrs |
| Lead-free / RoHS-compliant plating | Matte tin finish over Alloy 42 leadframe meets IPC-J-STD-609 Class 1 halogen-free requirements |
| Low reverse leakage (5.0 μA @ 1.0 V) | Minimizes standby current in always-on voltage monitor circuits powered by coin cells |
Applications
| Portable Battery Voltage Monitor | USB-C ESD Clamp Reference |
|---|---|
Use Scenario: Monitoring Li-ion cell voltage in Bluetooth earbuds with 3.0–4.2 V range. IC Role / Device Role / Timing Role: Provides stable 4.3 V reference for ADC input scaling and low-battery threshold detection. Use Value: Enables accurate state-of-charge estimation within ±2% error due to tight VZ tolerance and low tempco. | Use Scenario: Biasing TVS diode array clamps in USB-C receptacle circuits. IC Role / Device Role / Timing Role: Sets precise turn-on threshold for bidirectional ESD protection devices during transient events. Use Value: Ensures clamp activation at 4.3 V ±0.2 V before IC I/O damage occurs, verified per IEC 61000-4-2 Level 4. |
| Industrial Sensor Signal Conditioning | Smart Home Motion Detector Bias |
Use Scenario: Stabilizing excitation voltage for MEMS accelerometer bridges in HVAC controllers. IC Role / Device Role / Timing Role: Supplies regulated 4.3 V bias to Wheatstone bridge, rejecting supply ripple >60 dB. Use Value: Reduces bridge offset drift to <50 μV/°C, improving temperature-invariant motion sensitivity. | Use Scenario: Generating reference voltage for PIR sensor amplifier bias in battery-operated occupancy sensors. IC Role / Device Role / Timing Role: Delivers low-noise, low-leakage bias point for op-amp input stage in ultra-low-power wake-up circuitry. Use Value: Extends coin-cell life to >2 years by limiting quiescent current to <1 μA in sleep mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584C4V3LT1G | Same 4.3 V nominal, but SOD-523 package (slightly larger); 30 Ω ZZT, 10 μA IR @ 1 V | Higher thermal resistance (900 °C/W); less suitable for high-density layouts | Prefer when legacy SOD-523 footprint compatibility is required over size optimization |
| MMSZ4685T1G | 4.3 V nominal, SOD-123 package; 150 mW rating but 40 Ω ZZT, 100 μA IR @ 1 V | Larger footprint (3.5 × 1.6 mm); higher leakage limits use in sub-μA sleep circuits | Select only when board space allows and leakage sensitivity is not critical |
Compared with BZX584C4V3LT1G and MMSZ4685T1G, MMBZ5229BT-7-F offers the smallest footprint, lowest ZZT, and lowest IR, making it optimal for space- and power-constrained designs where regulation precision and standby efficiency are prioritized.
Availability
MMBZ5229BT-7-F is available at Aetrix Electronics and suitable for portable battery voltage monitors, USB-C ESD clamp references, and industrial sensor signal conditioning requiring stable component supply and full traceability.
Supply support for MMBZ5229BT-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, headquartered in Plano, Texas, with design centers across Asia and manufacturing in China, Taiwan, and the U.S.
This part belongs to the MMBZ52xxBT series of low-power Zener diodes, designed specifically for compact, high-reliability voltage reference and protection functions in consumer, computing, and industrial applications.
FAQ
What is the maximum continuous Zener current for MMBZ5229BT-7-F at 25°C ambient?
The absolute maximum DC current is determined by power dissipation: 150 mW ÷ 4.3 V ≈ 35 mA. However, the recommended test current is 20 mA per datasheet, and derating begins above 25°C per Fig. 1 - at 85°C ambient, max current drops to ~18 mA to maintain safe junction temperature.
Does MMBZ5229BT-7-F have a specified temperature coefficient?
While the datasheet does not list a formal tempco value, typical Zener voltage drift for this 4.3 V device is +2.5 mV/°C near room temperature, based on Fig. 2 and industry-standard 4.3 V Zener behavior - confirmed via Diodes Inc. application note AP02003 for MMBZ52xxBT series.
Can MMBZ5229BT-7-F be used in place of a 3.3 V Zener diode?
No - its nominal Zener voltage is 4.3 V with ±5% tolerance (4.09–4.52 V), which exceeds the 3.3 V system's safe margin. Substituting would cause incorrect biasing or overvoltage stress; use MMBZ5226BT (3.3 V) instead for that voltage level.
Is the SOT-523 package of MMBZ5229BT-7-F compatible with standard reflow profiles?
Yes - it is qualified for lead-free reflow per J-STD-020D Level 1 moisture sensitivity, with peak temperature up to 260°C. Recommended profile follows IPC/JEDEC J-STD-020: ramp-to-peak ≤3°C/s, time above 217°C ≤60 s, peak 235–245°C for 10–30 s.
MMBZ5229BT-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOT-523
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 4.3 V
- Tolerance:
- ±5%
- Power - Max:
- 150 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-523
MMBZ5229BT-7-F FAQ
1.How can I place an order for MMBZ5229BT-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5229BT-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 MMBZ5229BT-7-F reliable?
The price and inventory of MMBZ5229BT-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 MMBZ5229BT-7-F is usually 5 days.
3.What payment methods are accepted for MMBZ5229BT-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5229BT-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5229BT-7-F?
MMBZ5229BT-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5229BT-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 MMBZ5229BT-7-F?
For technical support, including MMBZ5229BT-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5229BT-7-F requirements.
6.How does Aetrix verify that MMBZ5229BT-7-F is sourced from the original manufacturer or authorized distributors?
All MMBZ5229BT-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 MMBZ5229BT-7-F meets industry standards.
7.What is the process for return or replacement of MMBZ5229BT-7-F?
All MMBZ5229BT-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5229BT-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 MMBZ5229BT-7-F part is unused and in its original packaging.
Return procedure for MMBZ5229BT-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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