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Diodes Incorporated MMSZ5248BS-7
- Part No.:
- MMSZ5248BS-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
MMSZ5248BS-7.pdf
- Description:
- DIODE ZENER 18V 200MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:5,657
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Product details
Overview
MMSZ5248BS-7 from Diodes Incorporated is a surface-mount 18 V Zener diode in SOD-323 package, rated for 200 mW power dissipation, with nominal Zener voltage 17.1–18.9 V at 7.0 mA test current, maximum Zener impedance 21 Ω at 7.0 mA, and reverse leakage ≤0.1 µA at 14 V, used for precision voltage regulation and reference in low-power analog circuits.
For engineers reviewing the MMSZ5248BS-7 datasheet, MMSZ5248BS-7 pinout, MMSZ5248BS-7 application, or MMSZ5248BS-7 equivalent, key selection criteria include Zener voltage tolerance (±5%), low dynamic impedance, tight thermal resistance (625 °C/W), RoHS-compliant lead-free plating, and compatibility with automated SMT assembly on FR-4 PCBs.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage across its terminals under varying load or supply conditions. It features planar die construction for consistent parametric performance and low leakage, with specified operation from −65 °C to +150 °C ambient.
Its 200 mW power rating and 625 °C/W junction-to-ambient thermal resistance define safe operating limits on standard FR-4 layouts. The 21 Ω Zener impedance at 7 mA ensures minimal voltage deviation under small-signal current variations, supporting use in feedback references and overvoltage clamping.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 17.1–18.9 V at IZT = 7.0 mA - defines regulated output range for reference design |
| Power Dissipation (PD) | 200 mW - sets maximum continuous DC power handling on standard PCB layout |
| Zener Impedance (ZZT) | 21 Ω at IZT = 7.0 mA - determines AC voltage variation under small-signal load changes |
| Reverse Leakage (IR) | ≤0.1 µA at VR = 14 V - ensures minimal error current in high-impedance bias networks |
| Thermal Resistance (RθJA) | 625 °C/W - quantifies temperature rise per watt on recommended FR-4 pad layout |
| Operating Temperature | −65 °C to +150 °C - supports industrial and automotive under-hood environments |
Pinout & Package
Package: SOD-323 - ultra-small plastic surface-mount case (2.3–2.7 mm length × 1.2–1.4 mm width × 0.25–0.35 mm height), cathode indicated by band, compatible with reflow soldering and automated pick-and-place.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reverse breakdown reference node | Connected to lower-potential side of regulated circuit; forms reference ground return path |
| Cathode | Zener voltage reference terminal | Connected to regulated output node; voltage measured relative to anode under reverse bias |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Ensures repeatable Zener voltage distribution and low parameter drift over time and temperature |
| SOD-323 package | Enables high-density PCB layouts and compatibility with 0.5 mm pitch SMT assembly equipment |
| Lead-free & RoHS-compliant plating | Meets global environmental compliance requirements without compromising solderability or intermetallic reliability |
| Moisture sensitivity Level 1 | Eliminates need for dry-packaging or baking prior to assembly, reducing manufacturing overhead |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
|
Use Scenario: Providing stable 18 V reference for linear regulator feedback or ADC reference divider. IC Role / Device Role / Timing Role: Voltage reference element establishing precise DC bias point. Use Value: ±5% Zener tolerance and 21 Ω dynamic impedance ensure <±15 mV output variation under 1 mA load shift. |
Use Scenario: Protecting microcontroller I/O pins from transient overvoltage events exceeding 14 V. IC Role / Device Role / Timing Role: Shunt clamping device diverting excess current above breakdown threshold. Use Value: 0.1 µA leakage at 14 V prevents false triggering while enabling fast response to >18 V transients. |
| Current Source Bias | Temperature-Stable Oscillator Trim |
|
Use Scenario: Setting constant current for LED bias or op-amp input stage via resistor-Zener network. IC Role / Device Role / Timing Role: Stable voltage source enabling predictable current through series resistor. Use Value: Low 625 °C/W RθJA maintains regulation accuracy across −40 °C to +85 °C ambient range. |
Use Scenario: Fine-tuning oscillator frequency in crystal-based clock generators using voltage-dependent capacitance. IC Role / Device Role / Timing Role: Voltage-controlled capacitance element via depletion region modulation. Use Value: Typical junction capacitance ~15 pF at 0 V bias enables predictable C-V tuning slope near 18 V operating point. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B18,115 (Nexperia) | Same 18 V nominal, 200 mW rating, but SOD-323 package with 100 nA max leakage at 14 V (vs. 0.1 µA) | Lower leakage supports ultra-low-power sensor biasing where sub-100 nA error current is critical | Select when leakage budget is tighter than 0.1 µA; verify thermal derating curve matches board layout |
| MMBZ5248BLT1G (onsemi) | Identical 18 V spec, same SOD-323, but 350 mW rating and 500 °C/W RθJA | Higher power handling allows use in higher-current shunt regulators without thermal runaway | Prefer for designs requiring >200 mW dissipation; confirm layout supports improved thermal resistance |
Compared with BZX384-B18 and MMBZ5248BLT1G, MMSZ5248BS-7 offers best-in-class balance of leakage control, thermal stability on standard FR-4, and RoHS/halogen-free compliance-ideal for space-constrained industrial sensors and portable power management.
Availability
MMSZ5248BS-7 is available at Aetrix Electronics and suitable for precision voltage reference, overvoltage protection, and current-source biasing applications requiring stable component supply, consistent Zener voltage matching, and full RoHS compliance.
Supply support for MMSZ5248BS-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 and manufacturing operations across Asia and the Americas.
MMSZ5248BS-7 belongs to the MMSZ52xxBS family of general-purpose Zener diodes, engineered for cost-effective, high-volume voltage regulation in consumer, industrial, and computing power supplies.
FAQ
What is the maximum reverse voltage before breakdown for MMSZ5248BS-7?
The nominal Zener voltage is 18 V with a tolerance range of 17.1–18.9 V at 7.0 mA test current. Breakdown begins gradually above ~16.2 V (90% of min VZ), but stable regulation requires operation ≥17.1 V. Full specification applies only within the 17.1–18.9 V band at IZT = 7.0 mA.
Can MMSZ5248BS-7 be used in place of a 15 V Zener diode?
No - MMSZ5248BS-7 is specifically rated for 18 V nominal Zener voltage and is not interchangeable with 15 V parts like MMSZ5245BS. Substituting alters reference level by >20%, risking overvoltage in clamping or incorrect biasing in feedback networks. Always match nominal VZ to circuit requirements.
Does MMSZ5248BS-7 require heatsinking in typical applications?
No - with a 200 mW power rating and 625 °C/W thermal resistance, it dissipates ≤125 mW at 7.0 mA (18 V × 7 mA = 126 mW), resulting in ~79 °C junction rise above ambient on standard FR-4. This remains within the −65 °C to +150 °C operating range without added heatsinking.
Is the SOD-323 package compatible with standard reflow profiles?
Yes - the SOD-323 package uses matte tin-plated Alloy 42 leads and is qualified for lead-free reflow per J-STD-020D Level 1 moisture sensitivity. It withstands peak temperatures up to 260 °C and is compatible with standard Pb-free reflow profiles including ramp-soak-reflow cycles.
MMSZ5248BS-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- SOD-323
MMSZ5248BS-7 FAQ
1.How can I place an order for MMSZ5248BS-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5248BS-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 MMSZ5248BS-7 reliable?
The price and inventory of MMSZ5248BS-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5248BS-7 is usually 5 days.
3.What payment methods are accepted for MMSZ5248BS-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5248BS-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5248BS-7?
MMSZ5248BS-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5248BS-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 MMSZ5248BS-7?
For technical support, including MMSZ5248BS-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5248BS-7 requirements.
6.How does Aetrix verify that MMSZ5248BS-7 is sourced from the original manufacturer or authorized distributors?
All MMSZ5248BS-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 MMSZ5248BS-7 meets industry standards.
7.What is the process for return or replacement of MMSZ5248BS-7?
All MMSZ5248BS-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5248BS-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 MMSZ5248BS-7 part is unused and in its original packaging.
Return procedure for MMSZ5248BS-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMSZ5248BS-7 Tags
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