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Diodes Incorporated MMSZ5243B-7
- Part No.:
- MMSZ5243B-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
MMSZ5243B-7.pdf
- Description:
- DIODE ZENER 13V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:3,231
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Product details
Overview
MMSZ5243B-7 from Diodes Incorporated is a 13V, 500mW surface-mount Zener diode in SOD123 package, rated for 9.5mA test current with 13Ω zener impedance at 1kHz and 0.5μA reverse leakage at 9.9V. It serves as a precision voltage reference or overvoltage clamp in low-power analog and power-supply feedback circuits.
For engineers reviewing the MMSZ5243B-7 datasheet, MMSZ5243B-7 pinout, MMSZ5243B-7 application, or MMSZ5243B-7 equivalent, this device is selected for stable 13V regulation in space-constrained PCBs requiring AEC-Q101 qualification, RoHS compliance, and automated assembly compatibility.
Technical Context
This Zener diode operates in reverse breakdown to maintain a stable 13V nominal output across its specified test current range (9.5mA), with temperature coefficient optimized for mid-voltage Zeners (≈+0.06%/°C typical). Its 13Ω dynamic impedance ensures minimal voltage deviation under small-signal load variations.
The SOD123 package enables high thermal resistance management (338°C/W junction-to-ambient on FR-4) while supporting 370mW dissipation at 25°C ambient and derating to 500mW at 75°C lead temperature. Cathode band polarity is marked for unambiguous orientation during placement.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Nominal) | 13 V - Stable regulation point for reference or clamping at 9.5 mA test current |
| Zener Voltage Range | 12.35–13.65 V - Tolerance band defining usable regulation window under production variation |
| Zener Impedance | 13 Ω @ 1 kHz - Low dynamic resistance ensures tight voltage control under small AC ripple |
| Reverse Leakage Current | 0.5 μA @ 9.9 V - Minimal off-state conduction preserves efficiency in high-impedance bias networks |
| Power Dissipation | 370 mW @ 25°C - Maximum continuous DC power on standard FR-4 PCB with 1-inch copper pad |
| Package | SOD123 - Compact 2-pin surface-mount outline with cathode band marking and 0.01 g mass |
| AEC-Q101 Qualified | Yes - Validated for automotive-grade reliability including temperature cycling and HTRB |
Pinout & Package
Two-terminal device in SOD123 package: anode and cathode terminals defined by molded cathode band marking; no internal bonding wires or substrate connections beyond the two leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node in shunt regulator configuration | Connected to system ground or lowest potential point when used as voltage clamp |
| Cathode | Regulated output node in shunt regulator configuration | Connected to input supply rail through current-limiting resistor; delivers stable 13V to load |
Key Features
| Feature | Design Value |
|---|---|
| 500mW Power Rating at TL = +75°C | Enables operation in thermally constrained environments without forced cooling |
| AEC-Q101 Qualification | Validated for automotive electronics including engine control modules and body controllers |
| Halogen- and Antimony-Free "Green" Compound | Meets stringent environmental standards (<900 ppm Br/Cl, <1000 ppm Sb) for industrial and consumer use |
| Matte Tin Lead Finish | Ensures reliable solderability per MIL-STD-202 Method 208 and compatibility with lead-free reflow |
Applications
| USB Port Overvoltage Protection | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Clamp transient surges on 5V USB data/power lines to prevent IC damage. IC Role / Device Role / Timing Role: Shunt voltage clamp placed between VBUS and GND with series resistor. Use Value: Limits peak voltage to ≤13.65V during ESD events while drawing <0.5μA at normal operating voltage. | Use Scenario: Provide stable 13V reference for op-amp biasing in 4–20mA transmitter circuits. IC Role / Device Role / Timing Role: Precision voltage reference source for analog front-end gain-setting networks. Use Value: Delivers ±0.65V tolerance over production lot and maintains <13Ω impedance for low-noise signal integrity. |
| Automotive Cabin Control Panel | Low-Power IoT Node Voltage Regulation |
Use Scenario: Regulate microcontroller I/O rail in infotainment button backlighting circuit. IC Role / Device Role / Timing Role: Shunt regulator supplying clean 13V to LED driver ICs. Use Value: AEC-Q101 qualification ensures operation across –40°C to +125°C ambient with no parameter drift beyond spec. | Use Scenario: Stabilize supply to BLE SoC during battery voltage sag in coin-cell-powered sensors. IC Role / Device Role / Timing Role: Low-quiescent-current voltage clamp maintaining logic-level integrity. Use Value: Draws only 0.5μA leakage at 9.9V, extending battery life while clamping spikes above 13.65V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584-C13 | Same 13V nominal, but 300mW rating and SOD323 package; higher ZZT (20Ω) | Lower power handling limits use in sustained-clamp scenarios; smaller footprint reduces PCB area | Select when board space is critical and peak power <300mW |
| 1N4743A | Through-hole TO-92; 1W rating; wider VZ tolerance (12.35–14.05V); 10Ω impedance | Not suitable for automated SMT lines; better for prototyping or high-energy transients | Select for manual assembly or where higher surge energy absorption is required |
Compared with BZX584-C13 and 1N4743A, MMSZ5243B-7 uniquely balances SMT manufacturability, AEC-Q101 compliance, and 370mW FR-4-rated dissipation-making it optimal for automotive and industrial PCBs needing reliable 13V clamping without through-hole constraints.
Availability
MMSZ5243B-7 is available at Aetrix Electronics and suitable for USB protection circuits, industrial sensor interfaces, automotive cabin controls, and low-power IoT nodes requiring stable component supply and full traceability.
Supply support for MMSZ5243B-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.
The MMSZ52xxB series belongs to Diodes' general-purpose Zener diode product line, engineered specifically for cost-sensitive, high-volume applications demanding consistent voltage regulation, AEC-Q101 reliability, and green material compliance.
FAQ
What is the maximum continuous reverse voltage that MMSZ5243B-7 can withstand without breakdown?
The device is rated for 13V nominal Zener voltage with a guaranteed range of 12.35V to 13.65V at 9.5mA test current. Below 9.9V reverse bias, leakage remains ≤0.5μA; sustained operation above 13.65V risks exceeding specified power limits and thermal runaway on standard FR-4 layouts.
Does MMSZ5243B-7 support lead-free reflow soldering processes?
Yes. Its matte tin finish over Alloy 42 leadframe meets MIL-STD-202 Method 208 solderability requirements and is qualified for Pb-free reflow profiles up to 260°C peak temperature, with moisture sensitivity level 1 per J-STD-020.
How does the temperature coefficient affect regulation accuracy over automotive temperature ranges?
At 13V, the typical temperature coefficient is +0.06%/°C. Over –40°C to +125°C, this introduces ≈±0.1V drift relative to 25°C baseline-within the 12.35–13.65V initial tolerance band and acceptable for non-precision reference applications.
Can MMSZ5243B-7 be used in parallel for higher current handling?
No. Zener diodes exhibit manufacturing spread in VZ and dynamic impedance; paralleling causes current hogging and thermal instability. For higher current, use a single higher-power Zener or active regulation with a transistor pass element.
MMSZ5243B-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- -
MMSZ5243B-7 FAQ
1.How can I place an order for MMSZ5243B-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5243B-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 MMSZ5243B-7 reliable?
The price and inventory of MMSZ5243B-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5243B-7 is usually 5 days.
3.What payment methods are accepted for MMSZ5243B-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5243B-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5243B-7?
MMSZ5243B-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5243B-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 MMSZ5243B-7?
For technical support, including MMSZ5243B-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5243B-7 requirements.
6.How does Aetrix verify that MMSZ5243B-7 is sourced from the original manufacturer or authorized distributors?
All MMSZ5243B-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 MMSZ5243B-7 meets industry standards.
7.What is the process for return or replacement of MMSZ5243B-7?
All MMSZ5243B-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5243B-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 MMSZ5243B-7 part is unused and in its original packaging.
Return procedure for MMSZ5243B-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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