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Diodes Incorporated MMSZ5243BQ-7-F
- Part No.:
- MMSZ5243BQ-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5243BQ-7-F.pdf
- Description:
- DIODE ZENER 13V 370MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:4,134
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Product details
Overview
MMSZ5243BQ-7-F from Diodes Incorporated is an AEC-Q101-qualified 13 V, ±5% tolerance Zener diode in SOD123 package, rated for 500 mW power dissipation at TL = +75°C and 370 mW at TA = +25°C, with 9.5 mA test current, 13 Ω zener impedance at IZT, and 0.5 µA reverse leakage at VR = 9.9 V. It serves as a precision voltage reference or overvoltage clamp in automotive power management circuits.
For engineers reviewing the MMSZ5243BQ-7-F datasheet, MMSZ5243BQ-7-F pinout, MMSZ5243BQ-7-F application, or MMSZ5243BQ-7-F equivalent, key selection criteria include its AEC-Q101 qualification, tight 12.35–13.65 V Zener voltage range, low 13 Ω dynamic impedance, SOD123 thermal performance on FR-4 PCB, and automotive-grade tape-and-reel packaging (3,000 pcs/reel).
Technical Context
This Zener diode operates in reverse breakdown to maintain stable voltage regulation under varying load and temperature conditions. Its 13 V nominal Zener voltage exhibits a positive temperature coefficient (~+0.06%/°C), and it delivers stable regulation down to 0.25 mA knee current (IZK) with ZZK = 600 Ω.
The device uses a planar epitaxial construction with matte tin-plated Alloy 42 leadframe, enabling solderability per MIL-STD-202 Method 208 and compatibility with automated SMT assembly. Its SOD123 package provides RθJA = 338 °C/W on standard FR-4 layout and meets J-STD-020 Level 1 moisture sensitivity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 13.0 V nominal, 12.35–13.65 V range at 9.5 mA - ensures precise clamping in 12 V automotive systems. |
| Power Dissipation | 370 mW at TA = +25°C - defines maximum continuous DC power on standard PCB layout. |
| Zener Impedance | 13 Ω at IZT = 9.5 mA - determines output voltage stability under load transients. |
| Reverse Leakage | 0.5 µA at VR = 9.9 V - guarantees minimal quiescent current in standby voltage monitoring. |
| Thermal Resistance | RθJA = 338 °C/W - sets junction-to-ambient temperature rise per watt on FR-4 with 1-inch copper pad. |
| Package | SOD123 - surface-mount outline with 2.65 mm body width, 1.55 mm length, and cathode band polarity marking. |
| AEC-Q101 Qualified | Yes - validated for automotive applications including engine control units and body electronics. |
Pinout & Package
Two-terminal SOD123 package with cathode band indicating the cathode terminal. No internal circuitry - terminals are unidirectional: anode (unmarked end) and cathode (banded end).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener reference ground node | Connected to lower-potential side of regulated circuit; forms return path during reverse breakdown. |
| Cathode | Zener voltage reference terminal / input node | Connected to higher-potential side; maintains stable 13 V relative to anode during regulation. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q101 compliant - enables use in under-hood ECUs without additional reliability screening. |
| Green compound molding | Halogen- and antimony-free UL 94V-0 plastic - satisfies automotive environmental compliance (e.g., BMW GS 95024). |
| Lead-free plating | Matte tin over Alloy 42 - ensures RoHS 2 (2011/65/EU) compliance and reliable reflow soldering. |
| Low leakage at low VR | 0.5 µA @ 9.9 V - supports accurate undervoltage detection in always-on vehicle modules. |
| Stable knee behavior | IZK = 0.25 mA, ZZK = 600 Ω - enables usable regulation even near turn-on threshold. |
Applications
| Engine Control Unit (ECU) Reference | Infotainment Power Rail Clamp |
|---|---|
Use Scenario: Stabilizing 13 V supply rail for microcontroller ADC reference in gasoline/diesel engine control modules. IC Role / Device Role / Timing Role: Precision voltage reference for analog sensing and signal conditioning circuitry. Use Value: Maintains <±1% reference accuracy across -40°C to +125°C ambient, supporting ASIL-B functional safety requirements. |
Use Scenario: Clamping transient spikes on 12 V infotainment system power input during load dump events. IC Role / Device Role / Timing Role: Overvoltage protection element in front-end power stage. Use Value: Limits voltage to ≤13.65 V during 100 ms load dump pulses, preventing damage to downstream PMICs and SoCs. |
| Body Control Module (BCM) Wake-Up Detection | ADAS Camera Module Bias Supply |
Use Scenario: Generating stable bias for wake-up comparator in low-power BCM sleep mode. IC Role / Device Role / Timing Role: Low-current voltage reference for threshold detection circuitry. Use Value: Draws only 0.5 µA at 9.9 V, enabling <1 µA total sleep current while maintaining reliable wake-up sensitivity. |
Use Scenario: Providing regulated 13 V bias to image sensor analog front-end in rear-view camera modules. IC Role / Device Role / Timing Role: Analog supply stabilization for pixel readout and ADC clocking. Use Value: Delivers <10 mV ripple under 2 mA load, reducing fixed-pattern noise in CMOS image sensors. |
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 13 V nominal, but ±5% tolerance, 300 mW rating, SOD323 package (smaller footprint, higher RθJA = 450 °C/W) | Limited to low-power consumer applications; not AEC-Q101 qualified | Select when board space is constrained and automotive qualification is unnecessary. |
| 1N4742A | 12 V nominal, ±5%, 1 W rating, DO-41 through-hole package | Requires wave soldering; unsuitable for high-density SMT automotive PCBs | Choose only for legacy through-hole designs or prototyping where thermal margin >1 W is required. |
Compared with BZX584-C13 and 1N4742A, MMSZ5243BQ-7-F uniquely combines AEC-Q101 qualification, SOD123 SMT compatibility, and optimized 370 mW/13 V regulation for space-constrained automotive modules requiring production-grade reliability.
Availability
MMSZ5243BQ-7-F is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, and ADAS camera power supplies requiring stable component supply with full traceability and AEC-Q101 compliance.
Supply support for MMSZ5243BQ-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.
This device belongs to the MMSZ52xxB automotive Zener diode family, engineered specifically for voltage regulation and transient suppression in harsh-environment automotive electronics operating from -40°C to +150°C.
FAQ
What is the maximum allowable junction temperature for MMSZ5243BQ-7-F?
The absolute maximum junction temperature is +150°C, consistent with its AEC-Q101 qualification and specified operating temperature range (TJ = -65°C to +150°C). Derating begins at +75°C case temperature, where power dissipation drops linearly to zero at +150°C.
Is MMSZ5243BQ-7-F compatible with lead-free reflow profiles?
Yes - it features matte tin plating over Alloy 42 leadframe and is qualified for Pb-free reflow per JEDEC J-STD-020, supporting peak temperatures up to 260°C for 10 seconds. Its SOD123 package withstands standard IPC/JEDEC G2 profile without delamination or solder joint failure.
How does the 13 Ω Zener impedance affect regulation accuracy under load variation?
At IZT = 9.5 mA, 13 Ω impedance means a 1 mA load change causes ~13 mV output shift. Combined with ±5% VZ tolerance, this yields ±0.7 V total regulation error across production units - sufficient for non-critical biasing and clamping in automotive subsystems.
Can MMSZ5243BQ-7-F be used in parallel for higher power handling?
No - Zener diodes exhibit negative temperature coefficients below ~5 V and positive above, but MMSZ5243BQ-7-F's +0.06%/°C coefficient still causes current hogging if paralleled without ballast resistors. Diodes Incorporated explicitly advises against parallel operation in DS18010 Rev. 28.
MMSZ5243BQ-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:
- 370 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 (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
MMSZ5243BQ-7-F FAQ
1.How can I place an order for MMSZ5243BQ-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5243BQ-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 MMSZ5243BQ-7-F reliable?
The price and inventory of MMSZ5243BQ-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 MMSZ5243BQ-7-F is usually 5 days.
3.What payment methods are accepted for MMSZ5243BQ-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5243BQ-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5243BQ-7-F?
MMSZ5243BQ-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5243BQ-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 MMSZ5243BQ-7-F?
For technical support, including MMSZ5243BQ-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5243BQ-7-F requirements.
6.How does Aetrix verify that MMSZ5243BQ-7-F is sourced from the original manufacturer or authorized distributors?
All MMSZ5243BQ-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 MMSZ5243BQ-7-F meets industry standards.
7.What is the process for return or replacement of MMSZ5243BQ-7-F?
All MMSZ5243BQ-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5243BQ-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 MMSZ5243BQ-7-F part is unused and in its original packaging.
Return procedure for MMSZ5243BQ-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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