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Diodes Incorporated MMBZ5250B-7-F
- Part No.:
- MMBZ5250B-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5250B-7-F.pdf
- Description:
- DIODE ZENER 20V 350MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:7,976
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Product details
Overview
MMBZ5250B-7-F from Diodes Incorporated is a 20V ±5% surface-mount Zener diode in SOT23 package, rated for 350mW power dissipation at 25°C, with 6.2mA test current, 25Ω dynamic impedance at 1kHz, and ≤0.1µA reverse leakage at 15V. It provides precision voltage regulation in low-power analog reference and overvoltage protection circuits.
For engineers reviewing the MMBZ5250B-7-F datasheet, MMBZ5250B-7-F pinout, MMBZ5250B-7-F application, or MMBZ5250B-7-F equivalent, this part serves as a stable, RoHS-compliant, lead-free Zener solution for compact PCB designs requiring tight voltage tolerance, low thermal resistance (357°C/W), and compatibility with automated assembly processes.
Technical Context
This device operates in reverse-bias breakdown mode to maintain a stable 20V reference across varying load currents. Its planar die construction ensures consistent Zener characteristics and low parameter drift over temperature (−65°C to +150°C operating range).
The 25Ω Zener impedance at 6.2mA and 1kHz enables low-noise regulation in feedback networks, while its 350mW FR-4 PCB rating supports use in space-constrained industrial and consumer power management stages without forced cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20V nominal, 19.0–21.0V range at IZT = 6.2mA - defines precise clamping threshold for voltage-sensitive circuits |
| Power Dissipation (PD) | 350mW on FR-4 PCB - sets maximum continuous power handling without heatsinking |
| Zener Impedance (ZZT) | 25Ω at f = 1kHz, IZT = 6.2mA - determines regulation stiffness and AC ripple rejection |
| Reverse Leakage (IR) | ≤0.1µA at VR = 15V - ensures minimal standby current in high-impedance bias networks |
| Thermal Resistance (RθJA) | 357°C/W - quantifies junction-to-ambient temperature rise per watt, critical for thermal design margin |
| Package | SOT23 - 3-pin surface-mount outline enabling 0.9mm × 2.9mm board footprint and reflow compatibility |
| Operating Temperature | −65°C to +150°C - supports deployment in automotive under-hood, industrial control, and outdoor electronics |
Pinout & Package
SOT23 package: 3-terminal plastic molded case with matte tin-plated Alloy 42 leadframe; terminals are anode (Pin 1), cathode (Pin 2), and anode (Pin 3) - Pin 3 is internally connected to Pin 1 per Diodes Inc. schematic.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Main anode connection; tied internally to Pin 3 for mechanical robustness and thermal path enhancement |
| Pin 2 | Cathode | Zener cathode - connects to regulated node or voltage reference point in reverse-bias configuration |
| Pin 3 | Anode (tie) | Internally bonded to Pin 1; used for improved solder joint reliability and reduced thermal resistance |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Enables tight VZ tolerance (±5%), low parametric drift, and repeatable breakdown behavior across production lots |
| 350mW dissipation on FR-4 | Eliminates need for external heat sinking in most low-current regulation applications (e.g., op-amp references, ADC biasing) |
| Lead-free & RoHS 3 compliant | Meets EU Directive 2015/863/EU; contains <900ppm Br, <900ppm Cl, <1000ppm Sb - suitable for green manufacturing programs |
| Moisture Sensitivity Level 1 | Allows unlimited floor life before reflow; no baking required prior to assembly - reduces production overhead |
| Automated assembly optimized | Standard SOT23 footprint and matte tin finish ensure reliable pick-and-place accuracy and solder wetting on standard reflow profiles |
Applications
| Industrial Sensor Signal Conditioning | USB Port Overvoltage Protection |
|---|---|
Use Scenario: Stabilizing reference voltage for 12-bit analog front-end of temperature/humidity sensor module. IC Role / Device Role / Timing Role: Zener diode providing 20V rail clamp and precision bias voltage for op-amp input stage. Use Value: 25Ω ZZT minimizes reference noise; ±5% VZ tolerance ensures measurement repeatability within 0.2% full-scale error budget. |
Use Scenario: Protecting USB 2.0 data lines and VBUS against transient surges from hot-plug events or ESD. IC Role / Device Role / Timing Role: Low-capacitance shunt clamp limiting line voltage to safe levels during fast transients. Use Value: 0.1µA leakage at 15V prevents signal integrity degradation; SOT23 footprint fits tight spacing near USB connector. |
| Programmable Logic Controller (PLC) Input Stage | Low-Power IoT Node Voltage Reference |
Use Scenario: Providing isolated 20V reference for optocoupler-based digital input conditioning in 24V industrial PLC modules. IC Role / Device Role / Timing Role: Zener regulator establishing stable bias for phototransistor collector resistor network. Use Value: −65°C to +150°C rating ensures operation in uncontrolled cabinet environments; 350mW rating handles worst-case input surge energy. |
Use Scenario: Generating stable 20V reference for battery-monitoring ADC in coin-cell-powered asset tracker. IC Role / Device Role / Timing Role: Precision voltage reference source for ratiometric sensing and low-power sleep-mode calibration. Use Value: 0.1µA leakage preserves battery life over multi-year deployments; SOT23 size minimizes PCB area in ultra-compact modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C20LT1G | Same 20V nominal, but ±6% tolerance (18.8–21.2V); 300mW rating; higher ZZT = 50Ω at 5mA | Lower regulation accuracy and stiffer AC impedance - less suitable for precision analog references | Select when cost sensitivity outweighs voltage stability requirements in non-critical clamping roles |
| MMBZ5250BS-7-F | Same electrical specs, but SOT-323 package (smaller footprint, higher RθJA = 430°C/W) | Higher thermal resistance limits power handling in sustained-load conditions; tighter board space constraint | Select only when PCB real estate is severely constrained and thermal derating is acceptable |
Compared with BZX84-C20LT1G and MMBZ5250BS-7-F, MMBZ5250B-7-F delivers superior voltage accuracy (±5% vs ±6%), lower dynamic impedance (25Ω vs 50Ω), and better thermal performance (357°C/W vs 430°C/W), making it optimal for precision regulation where stability and thermal margin are prioritized.
Availability
MMBZ5250B-7-F is available at Aetrix Electronics and suitable for industrial sensor interfaces, USB protection circuits, PLC input stages, and low-power IoT voltage references requiring stable component supply, long-term lifecycle support, and traceable green sourcing.
Supply support for MMBZ5250B-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, industry-qualified components for automotive, industrial, and consumer markets.
This part belongs to the MMBZ52xxB series of 350mW Zener diodes designed specifically for surface-mount voltage regulation and protection in space-constrained, high-volume electronics with stringent environmental compliance requirements.
FAQ
What is the maximum continuous Zener current for MMBZ5250B-7-F at 25°C?
The device is rated for 350mW power dissipation at 25°C. With a nominal Zener voltage of 20V, the maximum continuous DC current is calculated as 350mW ÷ 20V = 17.5mA. However, the specified test current is 6.2mA, and operation above this requires thermal derating per Figure 1's power derating curve.
Does MMBZ5250B-7-F meet AEC-Q200 stress testing requirements?
No - MMBZ5250B-7-F is a commercial-grade part. For automotive applications, Diodes offers Q-suffix variants (e.g., MMBZ5250BQ-7-F) qualified to AEC-Q200, manufactured in IATF 16949-certified facilities, and PPAP-capable. These are listed on Diodes' automotive products webpage.
How does the dual-anode configuration (Pins 1 and 3) affect PCB layout?
Pins 1 and 3 are internally shorted to the same anode node. Layout best practice is to connect both pads to the same net - this improves solder joint strength, enhances thermal conduction from the die, and reduces effective thermal resistance by ~10% compared to using only Pin 1.
Can MMBZ5250B-7-F be used in place of a 20V Zener in a linear regulator feedback loop?
Yes - its 25Ω Zener impedance and ±5% tolerance make it suitable for feedback references in low-current linear regulators. Ensure the regulator's feedback divider draws ≤100nA to avoid loading-induced voltage shift, and verify thermal margin under worst-case load conditions using the 357°C/W RθJA.
MMBZ5250B-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):
- 20 V
- Tolerance:
- ±5%
- Power - Max:
- 350 mW
- Impedance (Max) (Zzt):
- 25 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 15 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MMBZ5250B-7-F FAQ
1.How can I place an order for MMBZ5250B-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5250B-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 MMBZ5250B-7-F reliable?
The price and inventory of MMBZ5250B-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 MMBZ5250B-7-F is usually 5 days.
3.What payment methods are accepted for MMBZ5250B-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5250B-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5250B-7-F?
MMBZ5250B-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5250B-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 MMBZ5250B-7-F?
For technical support, including MMBZ5250B-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5250B-7-F requirements.
6.How does Aetrix verify that MMBZ5250B-7-F is sourced from the original manufacturer or authorized distributors?
All MMBZ5250B-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 MMBZ5250B-7-F meets industry standards.
7.What is the process for return or replacement of MMBZ5250B-7-F?
All MMBZ5250B-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5250B-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 MMBZ5250B-7-F part is unused and in its original packaging.
Return procedure for MMBZ5250B-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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