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Diodes Incorporated MMSZ5239BQ-7-F
- Part No.:
- MMSZ5239BQ-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5239BQ-7-F.pdf
- Description:
- DIODE ZENER 9.1V 370MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:3,809
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Product details
Overview
MMSZ5239BQ-7-F from Diodes Incorporated is an AEC-Q101-qualified 9.1 V, 500 mW surface-mount Zener diode in SOD123 package, rated for 20 mA test current, 10 Ω zener impedance at 20 mA, and 3.0 µA reverse leakage at 7.0 V, widely used for voltage regulation and reference in automotive power supply rails.
For engineers reviewing the MMSZ5239BQ-7-F datasheet, MMSZ5239BQ-7-F pinout, MMSZ5239BQ-7-F application, or MMSZ5239BQ-7-F equivalent, this part serves as a precision, low-power voltage clamp in ECU subsystems, sensor biasing networks, and overvoltage protection circuits where stable 9.1 V reference and automotive-grade reliability are required.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain a stable 9.1 V nominal output across a 20 mA test current, with ±5% tolerance (8.65–9.56 V) and temperature coefficient of +0.06%/°C. Its 10 Ω dynamic impedance ensures minimal voltage deviation under load variation.
Designed for automotive environments, it features AEC-Q101 qualification, halogen/antimony-free "Green" molding compound, and moisture sensitivity level 1. Thermal resistance is 338°C/W (junction-to-ambient, FR-4 PCB), enabling reliable operation from –65°C to +150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 9.1 V nominal (8.65–9.56 V range); provides precise clamping threshold for 9 V rail regulation. |
| Test Current (IZT) | 20 mA; defines operating point where VZ and ZZT are specified and optimized. |
| Zener Impedance (ZZT) | 10 Ω @ 20 mA; ensures <100 mV output shift for ±10 mA load change near regulation point. |
| Power Dissipation (PD) | 500 mW @ TL = +75°C; supports continuous operation in thermally constrained automotive PCB layouts. |
| Reverse Leakage (IR) | 3.0 µA @ VR = 7.0 V; guarantees minimal quiescent current draw in standby-biased reference circuits. |
| Package | SOD123; 2-pin surface-mount outline with cathode band marking, compatible with automated pick-and-place. |
Pinout & Package
Package: SOD123 - molded plastic case, 0.01 g weight, matte tin-plated alloy 42 leadframe, cathode indicated by band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node; establishes reference polarity for reverse-bias operation. |
| Cathode | Zener breakdown input / regulated output node | Connected to voltage source to be clamped; delivers stable 9.1 V to load when reverse-biased above breakdown threshold. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive electronics including engine control units and body modules. |
| 500 mW power rating @ TL = +75°C | Enables robust voltage clamping in high-temperature under-hood applications without derating. |
| Halogen- and antimony-free "Green" compound | Meets automotive environmental compliance (Br+Cl <1500 ppm, Sb <1000 ppm) and UL 94V-0 flammability. |
| Moisture Sensitivity Level 1 | Eliminates bake requirements prior to reflow, reducing manufacturing cost and process complexity. |
Applications
| Engine Control Unit (ECU) Reference | Automotive Sensor Biasing |
|---|---|
Use Scenario: Stable 9.1 V reference for analog front-end comparators and ADC reference dividers in engine management systems. IC Role / Device Role / Timing Role: Precision voltage clamp providing regulated bias for signal conditioning circuitry. Use Value: Maintains ±0.5% reference stability over –40°C to +125°C ambient, ensuring consistent sensor measurement accuracy. |
Use Scenario: Biasing network for Hall-effect and pressure sensors requiring low-noise, low-drift DC supply. IC Role / Device Role / Timing Role: Low-leakage Zener shunt regulator establishing clean 9.1 V node independent of main rail fluctuations. Use Value: 3.0 µA reverse leakage minimizes error contribution in microamp-level sensor excitation paths. |
| Infotainment Power Sequencing | Body Control Module (BCM) Overvoltage Clamp |
Use Scenario: Voltage supervision during cold-crank and load-dump transients in head unit power domains. IC Role / Device Role / Timing Role: Fast-response shunt element absorbing transient energy above 9.1 V threshold. Use Value: 10 Ω ZZT limits clamping voltage overshoot to ≤9.3 V under 15 mA surge, protecting downstream LDOs. |
Use Scenario: Protection of 9 V logic rails in door module microcontrollers against battery overvoltage events. IC Role / Device Role / Timing Role: Primary overvoltage clamp activated before TVS diodes engage, reducing stress on secondary protection. Use Value: 500 mW rating sustains 100 ms overvoltage pulses up to 14.5 V without thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C9V1-7-F | Same 9.1 V nominal, but SOT-23 package (higher RθJA = 370°C/W) and higher ZZT = 15 Ω. | Less suitable for high-temperature automotive PCBs due to inferior thermal performance. | Select when board space is constrained and thermal load is light; not recommended for under-hood use. |
| 1N4739A | Through-hole DO-41 package, 1 W rating, 10 Ω ZZT, but no AEC-Q101 qualification or Green compliance. | Not approved for automotive production; limited to industrial prototyping or non-safety-critical designs. | Choose only for legacy through-hole designs or cost-sensitive non-automotive applications. |
Compared with BZX84-C9V1-7-F and 1N4739A, MMSZ5239BQ-7-F uniquely combines AEC-Q101 qualification, SOD123 thermal efficiency, and Green compliance-making it the sole choice for production automotive voltage reference and clamp functions requiring zero rework risk and full regulatory alignment.
Availability
MMSZ5239BQ-7-F is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, and infotainment power sequencing requiring stable component supply with guaranteed long-term availability and AEC-Q101 traceability.
Supply support for MMSZ5239BQ-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, serving automotive, industrial, computing, and consumer markets with high-reliability components.
MMSZ5239BQ-7-F belongs to the MMSZ52xxB automotive Zener series, engineered specifically for voltage regulation and overvoltage protection in harsh-environment automotive electronics with emphasis on thermal stability and process compatibility.
FAQ
What is the maximum reverse voltage (VR) at which leakage remains ≤3.0 µA?
The datasheet specifies 3.0 µA maximum reverse leakage current at VR = 7.0 V. This value is measured under standard conditions (TA = +25°C) and defines the upper limit of applied reverse bias before significant leakage begins-critical for low-power bias networks where current budget is tight.
Can MMSZ5239BQ-7-F replace MMSZ5238BQ-7-F in a 9 V rail design?
No-MMSZ5238BQ-7-F has nominal VZ = 8.7 V (8.27–9.14 V), while MMSZ5239BQ-7-F is 9.1 V (8.65–9.56 V). The 0.4 V difference affects regulation accuracy and may exceed system tolerance; substitution requires verification of downstream component VIN margins and thermal drift behavior.
Is the SOD123 package lead-free and RoHS-compliant?
Yes-the device uses matte tin finish over alloy 42 leadframe, contains no purposely added lead, and meets EU Directive 2011/65/EU (RoHS 2). It is also halogen- and antimony-free per Diodes Incorporated's "Green" definition (<900 ppm Br, <900 ppm Cl, <1000 ppm Sb).
What is the thermal resistance (RθJA) when mounted on a standard FR-4 PCB?
RθJA is 338°C/W when mounted on an FR-4 PCB with a 1-inch copper pad layout. This value assumes standard JEDEC test conditions and enables accurate junction temperature estimation: TJ = TA + (PD × RθJA), critical for derating in high-ambient automotive environments.
MMSZ5239BQ-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):
- 9.1 V
- Tolerance:
- ±5%
- Power - Max:
- 370 mW
- Impedance (Max) (Zzt):
- 10 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 7 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
MMSZ5239BQ-7-F FAQ
1.How can I place an order for MMSZ5239BQ-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5239BQ-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 MMSZ5239BQ-7-F reliable?
The price and inventory of MMSZ5239BQ-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 MMSZ5239BQ-7-F is usually 5 days.
3.What payment methods are accepted for MMSZ5239BQ-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5239BQ-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5239BQ-7-F?
MMSZ5239BQ-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5239BQ-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 MMSZ5239BQ-7-F?
For technical support, including MMSZ5239BQ-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5239BQ-7-F requirements.
6.How does Aetrix verify that MMSZ5239BQ-7-F is sourced from the original manufacturer or authorized distributors?
All MMSZ5239BQ-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 MMSZ5239BQ-7-F meets industry standards.
7.What is the process for return or replacement of MMSZ5239BQ-7-F?
All MMSZ5239BQ-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5239BQ-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 MMSZ5239BQ-7-F part is unused and in its original packaging.
Return procedure for MMSZ5239BQ-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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