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Diodes Incorporated MMSZ5243B-7-F
- Part No.:
- MMSZ5243B-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5243B-7-F.pdf
- Description:
- DIODE ZENER 13V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:6,707
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Product details
Overview
MMSZ5243B-7-F from Diodes Incorporated is a 13V, 500mW surface-mount Zener diode in SOD-123 package, rated for 9.5mA test current with 13Ω dynamic impedance at 1kHz and 0.5μA reverse leakage at 9.9V, widely used for voltage regulation and overvoltage protection in power supply feedback loops and reference circuits.
For engineers reviewing the MMSZ5243B-7-F datasheet, MMSZ5243B-7-F pinout, MMSZ5243B-7-F application, or MMSZ5243B-7-F equivalent, key selection criteria include nominal Zener voltage tolerance (±5%), thermal resistance (338°C/W), AEC-Q101 qualification, RoHS/Green compliance, and SOD-123 footprint compatibility with automated assembly.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable voltage across its terminals under varying load or input conditions. Its 13V nominal Zener voltage is specified at 9.5mA test current, with temperature coefficient optimized for mid-range voltage stability (≈+0.06%/°C per Figure 6).
The device uses alloy-42 leadframe with matte tin plating, exhibits cathode-band polarity marking, and is qualified to AEC-Q101 for automotive reliability. Its 338°C/W junction-to-ambient thermal resistance assumes FR-4 PCB mounting with 1-inch copper pad layout per datasheet Note 5.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 13V nominal, 12.35–13.65V range at 9.5mA - ensures ±5% regulation tolerance in precision reference designs |
| Power Dissipation (PD) | 370mW @ TA = +25°C - defines maximum continuous DC power in standard ambient conditions |
| Zener Impedance (ZZT) | 13Ω @ 1kHz - low dynamic resistance enables stable regulation under small-signal AC ripple |
| Reverse Leakage (IR) | 0.5μA @ VR = 9.9V - minimal off-state current preserves efficiency in high-impedance bias networks |
| Thermal Resistance (RθJA) | 338°C/W - determines junction temperature rise above ambient for thermal design margining |
| Operating Temperature | −65°C to +150°C - supports extended industrial and automotive under-hood environments |
Pinout & Package
Package: SOD-123 surface-mount plastic case with cathode band marking; dimensions: 2.65mm × 1.55mm × 1.05mm (L × D × A); weight ≈ 0.01g; moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side of regulated circuit; forms reference ground return path |
| Cathode | Zener breakdown terminal / voltage regulation output | Connected to regulated node; supplies stable 13V reference when reverse-biased above breakdown |
Key Features
| Feature | Design Value |
|---|---|
| 500mW power rating | Enables use in medium-current regulation without external heat sinking on standard PCBs |
| AEC-Q101 qualification | Validated for automotive applications including engine control modules and body electronics |
| Halogen- and antimony-free "Green" compound | Meets strict environmental compliance (Br+Cl <1500ppm, Sb <1000ppm) for global OEM requirements |
| SOD-123 footprint | Standardized 2-pin package compatible with high-speed pick-and-place and reflow processes |
Applications
| Power Supply Feedback Regulation | Overvoltage Clamp Protection |
|---|---|
Use Scenario: Stabilizing output voltage in isolated flyback or buck converter feedback paths using optocoupler-coupled TL431 alternatives. IC Role / Device Role / Timing Role: Zener diode provides precise 13V reference to bias optocoupler LED or set shunt regulator threshold. Use Value: Tight 12.35–13.65V tolerance and low 13Ω impedance ensure <±1% output regulation accuracy under line/load transients. | Use Scenario: Protecting microcontroller I/O pins or ADC inputs from ESD-induced voltage spikes exceeding 10V. IC Role / Device Role / Timing Role: Acts as passive clamp by conducting above 13V, diverting surge current to ground before damage occurs. Use Value: 0.5μA leakage at 9.9V minimizes quiescent loading; 370mW rating handles short-duration 1kV/1.2μs surges per IEC 61000-4-2 Level 4. |
| Reference Voltage Source | Current-Limited Bias Network |
Use Scenario: Generating stable 13V reference for analog sensor signal conditioning or DAC output buffering. IC Role / Device Role / Timing Role: Provides low-noise, temperature-stable voltage node for op-amp biasing or ADC reference scaling. Use Value: +0.06%/°C tempco (per Figure 6) limits drift to <±10mV over −40°C to +125°C operating range. | Use Scenario: Setting fixed bias current for discrete transistor amplifiers or LED drivers via series resistor + Zener. IC Role / Device Role / Timing Role: Maintains constant voltage drop across series resistor to define predictable emitter/base current. Use Value: 9.5mA test current aligns with typical 5–15mA bias ranges; 338°C/W RθJA allows safe operation at 70°C ambient with 200mW dissipation. |
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 | 13V, ±5%, 300mW, SOD-323 package, 20mA test current | Lower power rating and smaller footprint limit thermal handling in sustained clamp duty | Select when board space is constrained and peak power <250mW |
| 1N4743A | 13V, ±5%, 1W, DO-41 through-hole, 38mA test current | Larger thermal mass and higher PD suit high-energy transient suppression but require manual assembly | Select for prototyping or legacy through-hole designs needing >500mW surge capability |
Compared with BZX584-C13 and 1N4743A, MMSZ5243B-7-F uniquely balances SMT manufacturability, AEC-Q101 qualification, and 370mW continuous rating-making it optimal for automotive-grade power management where reliability, size, and process compatibility are jointly critical.
Availability
MMSZ5243B-7-F is available at Aetrix Electronics and suitable for automotive power management, industrial sensor interface, and consumer power supply applications requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for MMSZ5243B-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.
MMSZ52xxB belongs to Diodes' general-purpose Zener diode product line, engineered for cost-effective, high-reliability voltage regulation and protection in automotive, industrial, and consumer electronics.
FAQ
What is the maximum reverse voltage that can be continuously applied without breakdown?
The MMSZ5243B-7-F has a nominal Zener voltage of 13V with a guaranteed range of 12.35V to 13.65V at 9.5mA. Below the minimum Zener voltage (12.35V), the device remains in high-impedance reverse-blocking mode with ≤0.5μA leakage at 9.9V. Continuous reverse voltage must stay below the specified breakdown range to avoid conduction.
Is this part suitable for use in automotive applications?
Yes - MMSZ5243B-7-F is explicitly qualified to AEC-Q101 standards for high-reliability automotive use. It operates across −65°C to +150°C, features halogen/antimony-free "Green" packaging, and is supplied in tape-and-reel format compatible with automated SMT lines used in Tier-1 automotive electronics manufacturing.
How does the SOD-123 package affect thermal performance?
In the SOD-123 package, thermal resistance from junction to ambient is 338°C/W when mounted on an FR-4 PCB with a 1-inch copper pad (per datasheet Note 5). This means at 370mW dissipation, junction temperature rises ~125°C above ambient - requiring derating above +50°C ambient to stay within the +150°C max rating.
Can this Zener diode replace the 1N4743A in existing designs?
Direct replacement requires verification of power, footprint, and thermal constraints. While both are 13V Zeners, MMSZ5243B-7-F delivers 370mW vs. 1N4743A's 1W, and uses SOD-123 vs. DO-41. It fits only if board layout supports SMT and peak power stays below 370mW; otherwise, thermal runaway risk increases without redesign.
MMSZ5243B-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):
- 13 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 13 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 9.9 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
MMSZ5243B-7-F FAQ
1.How can I place an order for MMSZ5243B-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5243B-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 MMSZ5243B-7-F reliable?
The price and inventory of MMSZ5243B-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 MMSZ5243B-7-F is usually 5 days.
3.What payment methods are accepted for MMSZ5243B-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5243B-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5243B-7-F?
MMSZ5243B-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5243B-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 MMSZ5243B-7-F?
For technical support, including MMSZ5243B-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5243B-7-F requirements.
6.How does Aetrix verify that MMSZ5243B-7-F is sourced from the original manufacturer or authorized distributors?
All MMSZ5243B-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 MMSZ5243B-7-F meets industry standards.
7.What is the process for return or replacement of MMSZ5243B-7-F?
All MMSZ5243B-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5243B-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 MMSZ5243B-7-F part is unused and in its original packaging.
Return procedure for MMSZ5243B-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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