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Diodes Incorporated MMBZ5248BW-7
- Part No.:
- MMBZ5248BW-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
MMBZ5248BW-7.pdf
- Description:
- DIODE ZENER 18V 200MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:422
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Product details
Overview
MMBZ5248BW-7 from Diodes Incorporated is a 18 V, 200 mW surface-mount Zener diode in SOT323 package, rated for 7.0 mA test current with 21 Ω zener impedance at 1 kHz and maximum 0.1 μA reverse leakage at 14 V, widely used for voltage regulation and overvoltage protection in low-power analog sensor interfaces.
For engineers reviewing the MMBZ5248BW-7 datasheet, MMBZ5248BW-7 pinout, MMBZ5248BW-7 application, or MMBZ5248BW-7 equivalent, key selection criteria include nominal zener voltage tolerance (±5%), thermal resistance (625 °C/W), AEC-Q101 qualification, green RoHS compliance, and SOT323 footprint compatibility with automated assembly.
Technical Context
This device operates as a precision shunt voltage reference, maintaining stable 18 V regulation under reverse-biased conditions with specified dynamic impedance and low leakage. Its 200 mW power rating and 625 °C/W junction-to-ambient thermal resistance define safe operating limits on standard FR4 PCBs with recommended pad layout.
The diode exhibits typical zener breakdown characteristics with sharp knee behavior above 7 mA test current and capacitance of ~10 pF at 1 V reverse bias-critical for noise-sensitive signal conditioning circuits where parasitic coupling must be minimized.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 18 V nominal, 17.1–18.9 V range at 7.0 mA - ensures ±5% regulation accuracy in feedback loops |
| Power Dissipation | 200 mW - limits continuous current to ~11 mA at 18 V, constraining use to low-power biasing |
| Zener Impedance | 21 Ω at 1 kHz - defines output impedance in regulation mode, affecting load transient response |
| Reverse Leakage | ≤0.1 μA at 14 V - enables ultra-low quiescent current operation in battery-powered monitoring circuits |
| Thermal Resistance | 625 °C/W - requires derating above 25°C ambient; full power only at TA ≤ 25°C |
| AEC-Q101 Qualified | Yes - validated for automotive electronics requiring high-reliability discrete components |
| Package | SOT323 - 3-terminal surface-mount outline with 0.65 mm pitch, compatible with fine-pitch reflow processes |
Pinout & Package
Package: SOT323 - three-terminal plastic surface-mount case with matte tin-plated Alloy 42 leadframe, moisture sensitivity level 1, weight ≈ 0.006 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower potential side in reverse-bias regulation configuration |
| Cathode | Zener breakdown terminal | Connected to higher potential side; voltage referenced to this node during regulation |
| Case / Heat Sink | Non-electrical mechanical tie | No internal connection; serves only structural and thermal dissipation role |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified reliability | Validated for automotive-grade temperature cycling, humidity, and mechanical stress per JESD22 standards |
| Green molding compound | Halogen- and antimony-free (<900 ppm Br/Cl, <1000 ppm Sb), UL 94V-0 flammability rating |
| Lead-free plating | Matte tin finish over Alloy 42, solderable per MIL-STD-202 Method 208 |
| Automated assembly optimized | SOT323 footprint supports high-speed pick-and-place and reflow without tombstoning |
Applications
| Industrial Sensor Signal Conditioning | Automotive Body Control Module (BCM) Voltage Clamp |
|---|---|
Use Scenario: Stabilizing reference voltage for 4–20 mA transmitter front-end op-amps in factory automation systems. IC Role / Device Role / Timing Role: Shunt voltage regulator providing precise 18 V rail for analog circuitry. Use Value: Maintains ±5% regulation across temperature while drawing <0.1 μA standby current, preserving loop power budget. | Use Scenario: Protecting microcontroller I/O pins from load-dump transients in 12 V vehicle subsystems. IC Role / Device Role / Timing Role: Overvoltage clamp limiting input voltage to 18 V during surge events. Use Value: Responds within nanoseconds to clamp spikes up to 30 V, preventing latch-up in 5 V logic interfaces. |
| Portable Medical Diagnostic Device Biasing | Smart Energy Meter Reference Divider |
Use Scenario: Generating stable bias for photodiode amplifier stages in handheld pulse oximeters. IC Role / Device Role / Timing Role: Low-noise voltage reference source in high-gain analog front-end. Use Value: 10 pF capacitance minimizes high-frequency coupling into sensitive measurement nodes. | Use Scenario: Scaling down 230 V AC mains for ADC input in Class 0.5 electricity meters. IC Role / Device Role / Timing Role: Precision voltage divider element with temperature-stable zener knee. Use Value: ±5% voltage tolerance and AEC-Q101 qualification ensure long-term metrology stability in field-deployed units. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B18,115 (Nexperia) | Same 18 V nominal, 200 mW, SOD323 package; 20 Ω ZZT, 0.1 μA IR at 14 V | Identical footprint but slightly tighter VZ tolerance (±2% vs ±5%) and lower thermal resistance (500 °C/W) | Preferred where tighter voltage tolerance and improved thermal performance are required on dense PCBs |
| 1SMA5925BT3G (onsemi) | 18 V nominal, 1.5 W power, SMA package; 10 Ω ZZT, 1.0 μA IR at 14 V | Larger SMA package, higher power handling, but 10× higher leakage and incompatible footprint | Selected when surge energy absorption >200 mW is needed, accepting larger board area and higher quiescent loss |
Compared with BZX384-B18,115 and 1SMA5925BT3G, MMBZ5248BW-7 offers optimal balance of AEC-Q101 qualification, green compliance, and SOT323 compactness for space-constrained automotive and industrial designs where 200 mW regulation suffices.
Availability
MMBZ5248BW-7 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, automotive body control modules, and portable medical diagnostic devices requiring stable component supply and AEC-Q101-compliant discretes.
Supply support for MMBZ5248BW-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, 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 voltage regulation, reference, and clamping in automotive, industrial, and consumer applications demanding high reliability and green compliance.
FAQ
What is the maximum continuous reverse current for reliable operation?
The MMBZ5248BW-7 is rated for 200 mW power dissipation at 25°C ambient. At its nominal 18 V zener voltage, this corresponds to a maximum continuous reverse current of approximately 11.1 mA. Derating is required above 25°C per the 625 °C/W thermal resistance curve, reducing allowable current linearly to zero at 150°C junction temperature.
Is this part suitable for use in automotive infotainment systems?
Yes - the MMBZ5248BW-7 is AEC-Q101 qualified and manufactured with halogen-free green molding compound, making it suitable for non-safety-critical automotive applications including infotainment power rails and I/O protection. It meets temperature, humidity, and mechanical stress requirements defined in the AEC-Q101 standard for discrete semiconductors.
How does the 21 Ω zener impedance affect circuit stability?
The 21 Ω dynamic impedance at 7 mA test current determines how much the output voltage varies with load current changes. For example, a 1 mA load shift causes ~21 mV deviation in regulated voltage. This value is critical in feedback networks where low impedance improves regulation accuracy and reduces sensitivity to upstream source variations.
Can this diode replace a 1N4746A in an existing design?
No - the 1N4746A is a through-hole 18 V, 1 W Zener in DO-41 package, while MMBZ5248BW-7 is a 200 mW SOT323 surface-mount device. Though voltage ratings match, the power rating, thermal behavior, and package are incompatible. Direct replacement would risk thermal runaway under identical load conditions due to 5× lower power capability.
MMBZ5248BW-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- -
- Tolerance:
- -
- Power - Max:
- -
- Impedance (Max) (Zzt):
- -
- Current - Reverse Leakage @ Vr:
- -
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MMBZ5248BW-7 FAQ
1.How can I place an order for MMBZ5248BW-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5248BW-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 MMBZ5248BW-7 reliable?
The price and inventory of MMBZ5248BW-7 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 is usually 5 days.
3.What payment methods are accepted for MMBZ5248BW-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5248BW-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5248BW-7?
MMBZ5248BW-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5248BW-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 MMBZ5248BW-7?
For technical support, including MMBZ5248BW-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5248BW-7 requirements.
6.How does Aetrix verify that MMBZ5248BW-7 is sourced from the original manufacturer or authorized distributors?
All MMBZ5248BW-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 MMBZ5248BW-7 meets industry standards.
7.What is the process for return or replacement of MMBZ5248BW-7?
All MMBZ5248BW-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5248BW-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 MMBZ5248BW-7 part is unused and in its original packaging.
Return procedure for MMBZ5248BW-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ5248BW-7 Tags
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