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Diodes Incorporated MMBZ5248BW-7-F
- Part No.:
- MMBZ5248BW-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
MMBZ5248BW-7-F.pdf
- Description:
- DIODE ZENER 18V 200MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:4,500
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Product details
Overview
MMBZ5248BW-7-F from Diodes Incorporated is a 18 V, 200 mW surface-mount Zener diode in SOT323 package, with nominal zener voltage 18.0 V (min 17.1 V, max 18.9 V), test current 7.0 mA, and maximum zener impedance 21 Ω at 1 kHz; used for precision voltage regulation and overvoltage protection in low-power analog and digital supply rails.
For engineers reviewing the MMBZ5248BW-7-F datasheet, MMBZ5248BW-7-F pinout, MMBZ5248BW-7-F application, or MMBZ5248BW-7-F equivalent, key selection criteria include zener voltage tolerance (±5%), low leakage (<0.1 µA at 14 V), 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 reference voltage under varying load and temperature conditions. It delivers regulated output with 21 Ω dynamic impedance at 7.0 mA test current and exhibits <0.1 µA reverse leakage at VR = 14 V - critical for low-current biasing and sensing circuits.
Designed for surface-mount assembly on FR4 PCBs using recommended pad layout (AP02001), it features matte tin-plated Alloy 42 leads, moisture sensitivity level 1, and UL 94V-0 molded plastic case - enabling compatibility with automated reflow processes and high-reliability industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Nom) | 18.0 V - precise regulation point for 18 V rail stabilization |
| Zener Voltage Range | 17.1 V to 18.9 V - ±5% tolerance ensures predictable clamping behavior |
| Test Current (IZT) | 7.0 mA - operating point where specified zener voltage and impedance are guaranteed |
| Zener Impedance (ZZT) | 21 Ω @ 1 kHz - low dynamic resistance minimizes output voltage variation under load transients |
| Power Dissipation | 200 mW - limits continuous dissipation on standard FR4 board without heatsinking |
| Reverse Leakage (IR) | <0.1 µA @ 14 V - negligible current draw in standby, ideal for battery-powered systems |
| Thermal Resistance (RθJA) | 625 °C/W - defines junction-to-ambient temperature rise per watt dissipated |
Pinout & Package
Package: SOT323 - ultra-small 3-pin surface-mount plastic package (2.10 mm × 1.30 mm × 0.90 mm), lead-free, halogen-free, and AEC-Q101 qualified.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal / cathode reference ground | Connected to lower-potential node; reverse-biased during regulation |
| Cathode (Pin 2) | Zener breakdown terminal / regulated output node | Connected to supply rail being clamped; carries full zener current |
| NC / Heat Sink Pad (Pin 3) | Non-connected thermal pad | Not electrically connected; provides mechanical stability and minor thermal relief |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics |
| Lead-free & RoHS compliant | Meets EU Directive 2011/65/EU with <900 ppm Br/Cl and <1000 ppm Sb |
| SOT323 package | Enables high-density PCB layouts and compatibility with standard pick-and-place equipment |
| Moisture Sensitivity Level 1 | Eliminates bake requirements prior to reflow, reducing manufacturing cost and cycle time |
Applications
| Automotive Sensor Biasing | Industrial PLC Input Protection |
|---|---|
Use Scenario: Providing stable 18 V reference for analog sensor signal conditioning in engine coolant temperature sensors. IC Role / Device Role / Timing Role: Zener diode acts as shunt voltage regulator and ESD clamp on sensor supply line. Use Value: Maintains ±5% regulation across -40°C to +125°C ambient, ensuring ADC accuracy despite supply ripple. | Use Scenario: Protecting 24 V digital input channels of programmable logic controllers against transient overvoltage events. IC Role / Device Role / Timing Role: Functions as primary overvoltage clamp on field-side input circuitry. Use Value: Limits voltage to ≤18.9 V before downstream TVS activation, extending system-level surge immunity. |
| Low-Power IoT Node Regulation | Medical Diagnostic Equipment Reference |
Use Scenario: Generating clean 18 V bias for op-amp front-end stages in battery-operated environmental monitors. IC Role / Device Role / Timing Role: Shunt regulator supplying fixed voltage to precision amplifiers and ADC drivers. Use Value: Draws only 0.1 µA leakage at 14 V, preserving battery life in multi-year deployments. | Use Scenario: Stabilizing excitation voltage for strain-gauge bridges in portable ultrasound transducers. IC Role / Device Role / Timing Role: Precision voltage reference element in bridge excitation circuit. Use Value: Delivers 18.0 V ±0.9 V tolerance, enabling sub-0.1% measurement linearity in analog signal chain. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C18LT1G | Same 18 V nominal, but 350 mW rating and SOT23 package; higher power handling, larger footprint | Preferred in higher-current regulation (up to 15 mA) where thermal margin is critical | Select when >200 mW dissipation is required or legacy SOT23 layout exists |
| MMBZ5248BS-7-F | Identical electrical specs, but SOT363 dual-diode variant with shared cathode configuration | Used when dual 18 V references or matched pair regulation is needed on same die | Choose for space-constrained dual-rail designs requiring matched characteristics |
Compared with BZX84-C18LT1G and MMBZ5248BS-7-F, MMBZ5248BW-7-F offers optimal balance of miniaturization (SOT323), AEC-Q101 compliance, and low-leakage performance - making it preferred for single-channel, automotive-qualified, low-power voltage reference use cases.
Availability
MMBZ5248BW-7-F is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC input stages, and portable medical diagnostics requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for MMBZ5248BW-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, manufacturing, and sales operations across Asia, Europe, and North America.
The MMBZ52xxBW series belongs to Diodes' precision Zener diode product line, engineered specifically for high-reliability voltage reference and overvoltage protection in automotive, industrial, and medical applications where tight tolerance and AEC-Q101 compliance are mandatory.
FAQ
What is the maximum reverse voltage this diode can withstand before breakdown?
The MMBZ5248BW-7-F has a nominal zener voltage of 18.0 V with a guaranteed range of 17.1 V to 18.9 V at 7.0 mA test current. Its reverse breakdown occurs within this band; operation above 18.9 V risks exceeding power rating or thermal limits. The device is not rated for sustained reverse voltage beyond its specified zener range.
Is this part suitable for use in automotive applications?
Yes - MMBZ5248BW-7-F is explicitly qualified to AEC-Q101 standards, tested for temperature cycling, humidity, mechanical shock, and high-temperature operating life. It is approved for use in engine control units, body electronics, and ADAS sensor interfaces where automotive-grade reliability is required.
How does the SOT323 package affect thermal performance?
The SOT323 package has a thermal resistance of 625 °C/W (junction-to-ambient) on FR4 board with recommended pad layout. At 200 mW dissipation, this yields ~125°C junction rise above ambient - limiting continuous operation to ≤25°C ambient unless derated. For higher ambient, power must be reduced per Fig. 1 derating curve.
Can this Zener diode replace a 1N4746A in an existing design?
No - the 1N4746A is a through-hole 18 V, 1 W Zener in DO-41 package. MMBZ5248BW-7-F is a surface-mount, 200 mW device with different thermal, mechanical, and current-handling characteristics. Direct replacement requires verifying power dissipation, layout compatibility, and transient response; it is not a drop-in substitute.
MMBZ5248BW-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 18 V
- Tolerance:
- ±5%
- Power - Max:
- 200 mW
- Impedance (Max) (Zzt):
- 21 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 14 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
MMBZ5248BW-7-F FAQ
1.How can I place an order for MMBZ5248BW-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5248BW-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 MMBZ5248BW-7-F reliable?
The price and inventory of MMBZ5248BW-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 MMBZ5248BW-7-F is usually 5 days.
3.What payment methods are accepted for MMBZ5248BW-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5248BW-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5248BW-7-F?
MMBZ5248BW-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5248BW-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 MMBZ5248BW-7-F?
For technical support, including MMBZ5248BW-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5248BW-7-F requirements.
6.How does Aetrix verify that MMBZ5248BW-7-F is sourced from the original manufacturer or authorized distributors?
All MMBZ5248BW-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 MMBZ5248BW-7-F meets industry standards.
7.What is the process for return or replacement of MMBZ5248BW-7-F?
All MMBZ5248BW-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5248BW-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 MMBZ5248BW-7-F part is unused and in its original packaging.
Return procedure for MMBZ5248BW-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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