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Diodes Incorporated MMSZ5248B-7-F
- Part No.:
- MMSZ5248B-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5248B-7-F.pdf
- Description:
- DIODE ZENER 18V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:43,839
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Product details
Overview
MMSZ5248B-7-F from Diodes Incorporated is a 18 V, 500 mW surface-mount Zener diode in SOD123 package, rated for 7.0 mA test current, 21 Ω dynamic impedance at 1 kHz, and 0.1 µA reverse leakage at 14 V, widely used for voltage regulation and reference in power supply feedback loops.
For engineers reviewing the MMSZ5248B-7-F datasheet, MMSZ5248B-7-F pinout, MMSZ5248B-7-F application, or MMSZ5248B-7-F equivalent, key selection criteria include nominal Zener voltage tolerance (±5%), thermal resistance (338 °C/W), AEC-Q101 qualification status, and SOD123 footprint compatibility with automated PCB assembly.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable voltage across load variations, with a temperature coefficient of +0.07 %/°C typical near 18 V - enabling predictable drift compensation in precision references. Its 500 mW power rating applies at lead temperature ≤75 °C, derating linearly to 370 mW at 25 °C ambient on FR-4 board.
The device features cathode band polarity marking, matte tin-plated Alloy 42 leads, and green molding compound compliant with halogen- and antimony-free requirements (<900 ppm Br/Cl, <1000 ppm Sb). Moisture sensitivity level is J-STD-020 Level 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 18 V nominal, 17.1–18.9 V range at 7.0 mA - ensures ±5% regulation tolerance under standard test conditions. |
| Power Dissipation (PD) | 500 mW @ TL = 75 °C - defines maximum safe continuous power when lead temperature is controlled. |
| Zener Impedance (ZZT) | 21 Ω @ 1 kHz, IZT = 7.0 mA - determines AC voltage variation under dynamic load changes. |
| Reverse Leakage (IR) | 0.1 µA @ VR = 14 V - confirms low standby current in undervoltage protection circuits. |
| Thermal Resistance (RθJA) | 338 °C/W - quantifies junction-to-ambient heat rise per watt on standard FR-4 layout. |
| Operating Temperature | −65 to +150 °C - supports industrial and automotive under-hood applications without derating. |
Pinout & Package
Package: SOD123 - surface-mount plastic case with cathode band marking, 1.05 mm height, 2.65 mm width, and 3.65 mm length; optimized for reflow soldering and high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to lower-potential node; reverse-biased operation requires cathode at higher potential. |
| Cathode | Zener breakdown terminal / voltage reference output | Marked by band; supplies regulated 18 V when reverse-biased above breakdown threshold. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing. |
| Green molding compound | Halogen- and antimony-free (<900 ppm Br+Cl, <1000 ppm Sb), UL 94V-0 rated for flame resistance. |
| SOD123 footprint | Standardized 2-pin SMT package compatible with pick-and-place equipment and IPC-7351B land patterns. |
| Low leakage at 14 V | 0.1 µA max reverse current enables use in battery-backed voltage monitors with minimal drain. |
Applications
| Power Supply Feedback | Overvoltage Protection |
|---|---|
|
Use Scenario: Regulating output voltage in isolated flyback converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Zener reference providing precise 18 V threshold to TL431 shunt regulator input. Use Value: Maintains ±1% output accuracy over line/load/temperature with minimal component count. |
Use Scenario: Clamping transient surges on 15 V rail in automotive body control modules. IC Role / Device Role / Timing Role: Shunt limiter diverting excess energy to ground during load dump events. Use Value: Withstands 500 mW peak pulse power and 0.1 µA standby leakage to preserve system quiescent current. |
| Voltage Reference | Signal Level Translation |
|
Use Scenario: Generating stable bias point for op-amp comparators in industrial sensor interfaces. IC Role / Device Role / Timing Role: Precision DC reference source with +0.07 %/°C TC minimizing drift-induced offset error. Use Value: Enables 12-bit ADC accuracy over −40 to +125 °C without calibration. |
Use Scenario: Translating 3.3 V logic signals to 18 V interface levels in PLC I/O modules. IC Role / Device Role / Timing Role: Passive level-shifter using Zener clamp to define high-side rail. Use Value: Provides robust 18 V rail with 21 Ω impedance for fast edge integrity in 100 kHz digital signaling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584C18LT1G | 18 V, 300 mW, SOD-523, 40 Ω ZZT, 0.1 µA IR @ 14 V | Lower power rating and smaller footprint; less thermal margin in high-ambient environments. | Select when board space is constrained and power dissipation remains below 300 mW. |
| MMBZ5248B-7-F | Same electrical specs, but SOT-23 package (3-pin, anode/cathode/common) with 100 mW PD | Not interchangeable due to different package, pinout, and power handling; requires redesign. | Use only if SOT-23 mounting is mandatory and thermal design accommodates reduced dissipation. |
Compared with BZX584C18LT1G and MMBZ5248B-7-F, MMSZ5248B-7-F offers superior thermal performance (500 mW vs. 300/100 mW) and direct SOD123 compatibility for high-reliability industrial and automotive PCBs requiring proven AEC-Q101 qualification.
Availability
MMSZ5248B-7-F is available at Aetrix Electronics and suitable for automotive body electronics, industrial power supplies, and medical instrument voltage references requiring stable component supply, RoHS compliance, and long-term lifecycle support.
Supply support for MMSZ5248B-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 semiconductor company specializing in discrete, analog, and mixed-signal devices, with manufacturing and design centers across Asia, Europe, and the US.
MMSZ5248B-7-F belongs to the MMSZ52xxB series of general-purpose Zener diodes engineered for cost-effective, high-volume voltage regulation in commercial and automotive applications with stringent environmental compliance.
FAQ
What is the maximum reverse voltage before breakdown for MMSZ5248B-7-F?
The nominal Zener voltage is 18 V with a guaranteed 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 occurs only within the specified range under defined current and thermal conditions.
Is MMSZ5248B-7-F suitable for automotive applications?
Yes - it is qualified to AEC-Q101 standards, including stress tests for temperature cycling, high-temperature reverse bias, and electrostatic discharge. Its SOD123 package and green molding compound meet automotive manufacturing and environmental requirements.
How does thermal derating affect its power handling?
Rated 500 mW at 75 °C lead temperature, power must be linearly reduced by 3.92 mW/°C above that point. At 25 °C ambient on FR-4, maximum dissipation drops to 370 mW due to higher junction-to-ambient thermal resistance (338 °C/W).
Can this Zener diode replace MMSZ5248BS?
No - MMSZ5248BS uses the SOD-323 package (smaller size, different pad layout) and has distinct thermal characteristics. While electrical parameters match, mechanical incompatibility prevents drop-in replacement without PCB redesign.
MMSZ5248B-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 18 V
- Tolerance:
- ±5%
- Power - Max:
- 500 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-123
MMSZ5248B-7-F FAQ
1.How can I place an order for MMSZ5248B-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5248B-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 MMSZ5248B-7-F reliable?
The price and inventory of MMSZ5248B-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 MMSZ5248B-7-F is usually 5 days.
3.What payment methods are accepted for MMSZ5248B-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5248B-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5248B-7-F?
MMSZ5248B-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5248B-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 MMSZ5248B-7-F?
For technical support, including MMSZ5248B-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5248B-7-F requirements.
6.How does Aetrix verify that MMSZ5248B-7-F is sourced from the original manufacturer or authorized distributors?
All MMSZ5248B-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 MMSZ5248B-7-F meets industry standards.
7.What is the process for return or replacement of MMSZ5248B-7-F?
All MMSZ5248B-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5248B-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 MMSZ5248B-7-F part is unused and in its original packaging.
Return procedure for MMSZ5248B-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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