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Vishay General Semiconductor - Diodes Division MMSZ5242B-HE3-18
- Part No.:
- MMSZ5242B-HE3-18
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5242B-HE3-18.pdf
- Description:
- DIODE ZENER 12V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:3,700
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Product details
Overview
MMSZ5242B-HE3-18 from Vishay Semiconductors is a silicon planar Zener diode with a nominal zener voltage of 12 V, ±5 % tolerance, and 20 mA test current, designed for precision voltage regulation and reference in low-power analog circuits, power supply feedback loops, and overvoltage protection on microcontroller I/O lines.
For engineers reviewing the MMSZ5242B-HE3-18 datasheet, MMSZ5242B-HE3-18 pinout, MMSZ5242B-HE3-18 application, or MMSZ5242B-HE3-18 equivalent, key selection criteria include its SOD-123 package thermal resistance (RthJA = 420 K/W), dynamic impedance (30 Ω at 20 mA), temperature coefficient (+0.070 %/°C), and AEC-Q101 qualification status.
Technical Context
This device operates as a single-element, cathode-anode configured Zener diode optimized for stable reverse-bias breakdown under thermal equilibrium conditions. Its 12 V nominal zener voltage is specified at 20 mA (IZT1), with a maximum dynamic resistance of 30 Ω and reverse leakage current ≤1 μA at VR = 9.1 V.
The MMSZ5242B-HE3-18 integrates AEC-Q101 qualification, ESD robustness (>8 kV HBM), and RoHS compliance into the SOD-123 surface-mount package. It exhibits a positive temperature coefficient (+0.070 %/°C), indicating increasing VZ with rising junction temperature - critical for biasing stability in automotive and industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 12 V nominal, ±5 % tolerance - ensures predictable clamping within 11.4–12.6 V at 20 mA test current |
| Test Current (IZT) | 20 mA - defines operating point for VZ specification and dynamic resistance measurement |
| Dynamic Resistance (ZZ) | 30 Ω max at IZT = 20 mA - determines regulation stiffness and output impedance in shunt regulator designs |
| Temperature Coefficient (αVZ) | +0.070 %/°C - quantifies VZ drift with temperature; enables compensation in precision references |
| Power Dissipation (Ptot) | 300 mW on FR-4 board - sets maximum continuous power handling under standard PCB layout conditions |
| Thermal Resistance (RthJA) | 420 K/W - defines junction-to-ambient thermal path efficiency; critical for derating above 25 °C ambient |
| ESD Rating | Human Body Model > 8 kV - supports robust handling and operation in unshielded industrial control interfaces |
Pinout & Package
The MMSZ5242B-HE3-18 is housed in a SOD-123 surface-mount package (10.6 mg weight, UL 94 V-0 molding compound, MSL level 1), with cathode identified by a bar marking on the device body. The package uses a two-terminal configuration: anode and cathode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener reference ground node | Connected to circuit ground or lower-potential rail; forms return path during reverse breakdown |
| Cathode | Zener voltage output terminal / breakdown anode | Connected to regulated voltage node; supplies stable 12 V reference when reverse biased above VZ |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity testing, and mechanical shock per AEC-Q101 standards |
| ±5 % Zener voltage tolerance | Enables cost-effective voltage referencing without trimming while maintaining design margin for 12 V systems |
| SOD-123 footprint compatibility | Supports high-density PCB layouts with standardized 2.7 mm × 3.7 mm land pattern and 0.85 mm pad spacing |
| Low dynamic impedance (30 Ω) | Minimizes output voltage variation under load transients in shunt regulator configurations |
| Positive temperature coefficient (+0.070 %/°C) | Allows predictable VZ tracking with system temperature rise - useful for bias network compensation |
Applications
| Automotive Cabin Control Module | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Regulating 12 V supply rail for microcontroller peripherals and CAN transceiver bias in HVAC control units. IC Role / Device Role / Timing Role: Shunt voltage reference and overvoltage clamp protecting 3.3 V LDO inputs from battery transients. Use Value: Maintains stable 12 V reference under load variations up to 20 mA while surviving automotive load-dump events via coordinated TVS coordination. | Use Scenario: Providing precise 12 V reference for 16-bit ADC biasing in pressure and temperature sensor front-ends. IC Role / Device Role / Timing Role: Low-noise voltage reference source with minimal thermal drift across -40 to +125 °C operating range. Use Value: Enables <±0.5 LSB offset error contribution from reference drift due to its +0.070 %/°C αVZ and tight 5 % initial tolerance. |
| USB-C Power Delivery Monitor | Programmable Logic Controller (PLC) Input Protection |
Use Scenario: Clamping VBUS sense line to prevent overvoltage damage to USB PD controller GPIO during hot-plug events. IC Role / Device Role / Timing Role: Fast-response overvoltage protector with sub-μs turn-on latency during 20 V transients. Use Value: Limits sensed voltage to ≤12.6 V (max VZ) while drawing <1 μA leakage at 9.1 V - preserving signal integrity and power budget. | Use Scenario: Protecting 24 V DC digital input channels from field-wiring induced surges and polarity reversal. IC Role / Device Role / Timing Role: Reverse-polarity blocking and transient suppression element in optocoupler input stage. Use Value: Absorbs up to 300 mW surge energy without degradation, supported by 150 °C max junction temperature rating and AEC-Q101 stress validation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584C12 | 12 V, ±1 % tolerance, SOD-523 package, 200 mW Ptot, RthJA = 500 K/W | Higher precision but lower power rating and worse thermal performance | Select when tighter initial tolerance is required and power dissipation remains below 200 mW |
| MMSZ5242B-E3-18 | Same 12 V ±5 % spec, identical SOD-123 package, but lacks AEC-Q101 qualification and ESD enhancement | Not validated for automotive use; suitable only for commercial-grade consumer electronics | Choose for cost-sensitive non-automotive applications where AEC-Q101 compliance is unnecessary |
Compared with BZX584C12 and MMSZ5242B-E3-18, the MMSZ5242B-HE3-18 uniquely delivers automotive-grade reliability (AEC-Q101), higher power capability (300 mW vs. 200 mW), and superior thermal resistance (420 K/W vs. 500 K/W), making it optimal for under-hood and industrial control applications demanding long-term stability.
Availability
MMSZ5242B-HE3-18 is available at Aetrix Electronics and suitable for automotive cabin modules, industrial sensor signal conditioning, USB-C power delivery monitors, and programmable logic controller input protection requiring stable component supply and traceable sourcing.
Supply support for MMSZ5242B-HE3-18 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
Vishay Semiconductors is a global leader in discrete semiconductors, specializing in high-reliability diodes, MOSFETs, and optoelectronics for automotive, industrial, and computing markets.
The MMSZ52xx series is part of Vishay's small-signal Zener diode product line, engineered for precision voltage reference and overvoltage protection in space-constrained, thermally demanding applications.
FAQ
What is the nominal zener voltage and tolerance of the MMSZ5242B-HE3-18?
The MMSZ5242B-HE3-18 has a nominal zener voltage of 12 V with a tolerance of ±5 %, meaning its actual breakdown voltage falls between 11.4 V and 12.6 V when tested at 20 mA. This tolerance is confirmed in the Vishay datasheet revision 1.1 (July 2023) under Electrical Characteristics for part number MMSZ5242. The "B" suffix explicitly denotes the ±5 % grade.
Is the MMSZ5242B-HE3-18 qualified for automotive applications?
Yes, the MMSZ5242B-HE3-18 is AEC-Q101 qualified, as indicated by the "HE3_A" ordering code variant. It meets stress test requirements for temperature cycling, humidity, mechanical shock, and ESD (>8 kV HBM), making it suitable for under-hood and cabin control modules. This qualification is documented in Vishay's official datasheet section "Ordering Information" and "Features".
What package type does the MMSZ5242B-HE3-18 use, and what are its key mechanical dimensions?
The MMSZ5242B-HE3-18 uses the SOD-123 surface-mount package, measuring 2.7 mm × 3.7 mm with a maximum height of 0.1 mm. Key features include a cathode bar marking, 0.85 mm pad pitch, and UL 94 V-0 flammability rating. These dimensions and footprint recommendations are specified in the "Package Dimensions" section (page 4) of the Vishay datasheet.
What is the maximum power dissipation of the MMSZ5242B-HE3-18 on a standard FR-4 PCB?
The MMSZ5242B-HE3-18 has a maximum power dissipation of 300 mW when mounted on an FR-4 board using Vishay's recommended soldering footprint. This value is lower than its 500 mW rating under ideal lead-to-lead thermal conditions (RthJL = 250 K/W), reflecting real-world PCB thermal limitations. The 300 mW figure is explicitly stated in the "Absolute Maximum Ratings" table.
How does the temperature coefficient of the MMSZ5242B-HE3-18 affect its performance in wide-temperature applications?
The MMSZ5242B-HE3-18 has a temperature coefficient of +0.070 %/°C, meaning its zener voltage increases by approximately 8.4 mV per °C rise in junction temperature. This positive drift must be accounted for in precision references operating across -55 to +150 °C; however, it enables predictable compensation when paired with negative-drift components in bias networks.
MMSZ5242B-HE3-18 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 12 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 30 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 9.1 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
MMSZ5242B-HE3-18 FAQ
1.How can I place an order for MMSZ5242B-HE3-18 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5242B-HE3-18 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 MMSZ5242B-HE3-18 reliable?
The price and inventory of MMSZ5242B-HE3-18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5242B-HE3-18 is usually 5 days.
3.What payment methods are accepted for MMSZ5242B-HE3-18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5242B-HE3-18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5242B-HE3-18?
MMSZ5242B-HE3-18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5242B-HE3-18 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 MMSZ5242B-HE3-18?
For technical support, including MMSZ5242B-HE3-18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5242B-HE3-18 requirements.
6.How does Aetrix verify that MMSZ5242B-HE3-18 is sourced from the original manufacturer or authorized distributors?
All MMSZ5242B-HE3-18 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 MMSZ5242B-HE3-18 meets industry standards.
7.What is the process for return or replacement of MMSZ5242B-HE3-18?
All MMSZ5242B-HE3-18 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5242B-HE3-18, 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 MMSZ5242B-HE3-18 part is unused and in its original packaging.
Return procedure for MMSZ5242B-HE3-18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMSZ5242B-HE3-18 Tags
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