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Diodes Incorporated MMSZ5242BS-7
- Part No.:
- MMSZ5242BS-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
MMSZ5242BS-7.pdf
- Description:
- DIODE ZENER 12V 200MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:6,608
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Product details
Overview
MMSZ5242BS-7 from Diodes Incorporated is a surface-mount 12 V Zener diode in SOD-323 package, rated for 200 mW power dissipation, with nominal Zener voltage 12.0 V (min 11.4 V, max 12.6 V at 20 mA), dynamic impedance 30 Ω at test current, and reverse leakage ≤1.0 µA at 9.1 V. It serves as a precision voltage reference or overvoltage clamp in low-power analog signal conditioning circuits.
For engineers reviewing the MMSZ5242BS-7 datasheet, MMSZ5242BS-7 pinout, MMSZ5242BS-7 application, or MMSZ5242BS-7 equivalent, key selection criteria include its tight 5% Zener tolerance at 20 mA, low 30 Ω impedance ensuring stable regulation under load variation, SOD-323 footprint compatibility with high-density PCB layouts, and RoHS-compliant lead-free construction verified per J-STD-020D Level 1 moisture sensitivity.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain a stable reference voltage across its terminals when biased above its specified Zener voltage. Its planar die construction ensures consistent voltage regulation and thermal stability over temperature ranges from –65 °C to +150 °C.
The device exhibits a typical Zener impedance of 30 Ω at 20 mA test current and 600 Ω at 0.25 mA knee current, enabling predictable clamping behavior across varying load conditions. Its 200 mW power rating and 625 °C/W junction-to-ambient thermal resistance define safe operating limits on standard FR-4 PCBs with recommended pad layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Nom) | 12.0 V - stable reference point for voltage regulation or clamping at 20 mA bias |
| Zener Voltage Range | 11.4 V to 12.6 V - ±5% tolerance band defining accuracy for precision reference use |
| Test Current (IZT) | 20 mA - standardized bias condition for specifying nominal Zener voltage and impedance |
| Zener Impedance (ZZT) | 30 Ω - low dynamic resistance ensures minimal output voltage shift under load changes |
| Power Dissipation (PD) | 200 mW - maximum continuous power handling on FR-4 board with recommended pad layout |
| Reverse Leakage (IR) | ≤1.0 µA at 9.1 V - negligible standby current enabling low-power sensing and biasing |
| Thermal Resistance (RθJA) | 625 °C/W - defines junction temperature rise per milliwatt dissipated in ambient air |
Pinout & Package
Package: SOD-323 - ultra-small plastic surface-mount case (2.3–2.7 mm length × 1.2–1.4 mm width × 0.25–0.35 mm height), cathode indicated by band, compatible with automated pick-and-place and reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side in reverse-bias configuration; forms reference ground return path |
| Cathode | Zener breakdown terminal / regulated output node | Connected to higher-potential side; delivers stable 12 V reference when reverse-biased above breakdown threshold |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Ensures repeatable Zener voltage distribution and long-term parametric stability across production lots |
| SOD-323 package | Enables high-density PCB layouts and compatibility with fine-pitch automated assembly processes |
| Lead-free & RoHS compliant | Meets EU Directive 2011/65/EU without intentionally added lead; matte tin plating over Alloy 42 |
| Halogen- and antimony-free "Green" design | Contains <900 ppm bromine, <900 ppm chlorine, <1000 ppm antimony - supports eco-conscious manufacturing |
| Moisture Sensitivity Level 1 | No baking required prior to reflow; safe for standard SMT processing without preconditioning |
Applications
| Industrial Sensor Signal Conditioning | USB Port Overvoltage Protection |
|---|---|
Use Scenario: Stabilizing reference voltage for 12-bit ADC front-end in temperature/humidity transmitters. IC Role / Device Role / Timing Role: Zener diode provides fixed 12 V reference to op-amp bias network and ADC reference divider. Use Value: Tight 5% voltage tolerance and 30 Ω impedance minimize reference drift across supply and temperature variations, preserving measurement accuracy. |
Use Scenario: Clamping transient surges on USB VBUS line during hot-plug events in embedded host controllers. IC Role / Device Role / Timing Role: Reverse-biased Zener shunts excess energy above 12.6 V to ground before it reaches downstream USB PHY ICs. Use Value: Low 200 mW rating is sufficient for short-duration ESD-like transients; SOD-323 footprint fits compact USB Type-C connector routing. |
| Low-Power IoT Node Voltage Reference | Automotive Body Control Module Biasing |
Use Scenario: Generating stable 12 V rail for RF transceiver LDO input in battery-powered NB-IoT modules. IC Role / Device Role / Timing Role: Functions as primary voltage reference for low-noise LDO feedback network in always-on sensor subsystems. Use Value: Sub-microamp reverse leakage (<1 µA) minimizes quiescent current drain, extending coin-cell battery life beyond 5 years. |
Use Scenario: Providing regulated bias to Hall-effect position sensors in door latch assemblies. IC Role / Device Role / Timing Role: Zener maintains stable 12 V reference despite automotive battery fluctuations (9–16 V). Use Value: Wide operating temperature range (–65 °C to +150 °C) ensures reliable operation in under-hood environments without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B12,115 (Nexperia) | Same 12 V nominal Zener, but tighter 2% tolerance (11.76–12.24 V); 400 mW rating; SOD-323 package | Higher power handling allows greater surge margin; tighter tolerance suits metrology-grade references | Select when higher precision or transient energy absorption is required; verify thermal layout for 400 mW |
| MMBZ5242BS-7 (Diodes Inc.) | Identical electrical specs and SOD-323 package; differs only in marking code and tape/reel packaging (3 k vs. 10 k units) | No functional difference; same circuit role and performance in all designs | Choose based on volume requirements and inventory alignment-no redesign needed |
Compared with BZX384-B12 and MMBZ5242BS-7, the MMSZ5242BS-7 offers optimal balance of cost, availability, and specification compliance for general-purpose 12 V reference and clamping, while the Nexperia part adds precision and power headroom, and the MMBZ variant matches exactly with alternate packaging logistics.
Availability
MMSZ5242BS-7 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, USB port overvoltage protection, and low-power IoT node voltage reference requiring stable component supply and full traceability.
Supply support for MMSZ5242BS-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, manufacturing, and sales operations across Asia, Europe, and North America.
The MMSZ52xxBS series belongs to Diodes' general-purpose Zener diode product line, engineered specifically for compact, high-reliability voltage reference and transient suppression in space-constrained consumer, industrial, and computing applications.
FAQ
What is the maximum reverse voltage that can be continuously applied without breakdown?
The MMSZ5242BS-7 begins controlled Zener breakdown at approximately 11.4 V and is rated for stable regulation between 11.4 V and 12.6 V at 20 mA. Applying more than 12.6 V continuously exceeds its specified operating range and risks thermal runaway if power dissipation exceeds 200 mW. For non-regulation use, the absolute maximum reverse voltage before irreversible damage is not defined - operation must remain within the Zener voltage range and power limit.
Can this Zener diode replace a 12 V linear regulator in low-current applications?
No - the MMSZ5242BS-7 is not a voltage regulator IC and lacks current-limiting, thermal shutdown, or output capacitance drive capability. It functions only as a passive two-terminal reference or clamp. While it can stabilize voltage for microamp-level bias networks, it cannot source or sink significant load current without violating its 200 mW power limit or causing voltage droop due to its 30 Ω impedance.
Is the SOD-323 package compatible with IPC-7351B density levels?
Yes - the SOD-323 footprint used for MMSZ5242BS-7 conforms to IPC-7351B "Least" density level (LCC_SOD323_120X70N), with recommended copper pad dimensions of 0.7 mm × 0.5 mm and 0.3 mm solder mask expansion. Diodes Incorporated's AP02001 document specifies exact land patterns validated for thermal performance and solder joint reliability under reflow.
Does this part meet AEC-Q200 stress testing requirements for automotive use?
No - the MMSZ5242BS-7 is not AEC-Q200 qualified. While it operates from –65 °C to +150 °C and is used in some automotive body electronics, it has not undergone the full qualification test suite (e.g., temperature cycling, humidity bias, mechanical shock). For AEC-Q200-compliant 12 V Zener functionality, Diodes' AZ-series or Nexperia's BZX384-Q variants are designated alternatives.
MMSZ5242BS-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 12 V
- Tolerance:
- ±5%
- Power - Max:
- 200 mW
- Impedance (Max) (Zzt):
- 30 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 9.1 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-323
MMSZ5242BS-7 FAQ
1.How can I place an order for MMSZ5242BS-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5242BS-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 MMSZ5242BS-7 reliable?
The price and inventory of MMSZ5242BS-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5242BS-7 is usually 5 days.
3.What payment methods are accepted for MMSZ5242BS-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5242BS-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5242BS-7?
MMSZ5242BS-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5242BS-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 MMSZ5242BS-7?
For technical support, including MMSZ5242BS-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5242BS-7 requirements.
6.How does Aetrix verify that MMSZ5242BS-7 is sourced from the original manufacturer or authorized distributors?
All MMSZ5242BS-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 MMSZ5242BS-7 meets industry standards.
7.What is the process for return or replacement of MMSZ5242BS-7?
All MMSZ5242BS-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5242BS-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 MMSZ5242BS-7 part is unused and in its original packaging.
Return procedure for MMSZ5242BS-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMSZ5242BS-7 Tags
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