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Diodes Incorporated MMSZ5242B-7-F
- Part No.:
- MMSZ5242B-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5242B-7-F.pdf
- Description:
- DIODE ZENER 12V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:19,500
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Product details
Overview
MMSZ5242B-7-F from Diodes Incorporated is a 12 V, ±5% tolerance, 500 mW surface-mount Zener diode in SOD-123 package, rated for 20 mA test current and 30 Ω dynamic impedance at 1 kHz, with 1.0 µA reverse leakage at 9.1 V, designed for voltage regulation and reference in space-constrained DC power rails.
For engineers reviewing the MMSZ5242B-7-F datasheet, MMSZ5242B-7-F pinout, MMSZ5242B-7-F application, or MMSZ5242B-7-F equivalent, this device serves as a precision low-power shunt regulator where stable 12 V reference, tight voltage tolerance, and AEC-Q101 qualification for automotive environments are required.
Technical Context
This Zener diode operates in reverse breakdown to maintain a stable 12 V reference across load variations, with nominal Zener voltage of 12.0 V (min 11.4 V, max 12.6 V) at IZT = 20 mA. Its 30 Ω Zener impedance at 1 kHz ensures low output variation under dynamic current conditions.
Thermal performance is defined by 338 °C/W junction-to-ambient thermal resistance on FR-4 PCB with 1-inch copper pad, derating linearly from 500 mW at +75 °C case temperature to 370 mW at +25 °C ambient. It features cathode band polarity marking and matte tin-plated Alloy 42 leads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 12.0 V nominal, 11.4–12.6 V range at 20 mA - defines regulated output voltage tolerance for reference stability |
| Power Dissipation | 370 mW at TA = +25°C - sets maximum continuous DC power handling on standard PCB layout |
| Zener Impedance (ZZT) | 30 Ω at f = 1 kHz, IZT = 20 mA - determines AC ripple rejection capability in feedback paths |
| Reverse Leakage (IR) | 1.0 µA at VR = 9.1 V - ensures minimal quiescent current draw below knee voltage |
| Package | SOD-123 - surface-mount footprint (2.65 × 1.55 mm) compatible with automated pick-and-place and reflow |
| Qualification | AEC-Q101 qualified - validated for automotive-grade reliability including temperature cycling and HTRB |
Pinout & Package
Two-terminal device in SOD-123 package: anode and cathode marked by cathode band on top surface. No internal pins; terminals are solderable alloy-42 leads with matte tin finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to system GND or lower-potential rail; establishes reference point for Zener conduction |
| Cathode | Regulated output node | Provides stable 12 V when reverse-biased; connects to load or feedback network |
Key Features
| Feature | Design Value |
|---|---|
| 500 mW power rating at TL = +75°C | Enables higher transient power handling in thermally managed layouts without derating |
| AEC-Q101 qualification | Validates suitability for automotive infotainment, body control, and ADAS power monitoring circuits |
| SOD-123 package with J-STD-020 Level 1 moisture sensitivity | Supports standard reflow profiles without baking; reduces manufacturing overhead |
| Halogen- and antimony-free "Green" compound | Meets IPC-1752A environmental compliance requirements for RoHS 2 and ELV directives |
Applications
| Automotive Body Control Module | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Regulating 12 V supply for microcontroller I/O voltage references in door module ECUs. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable bias for ADC input scaling and GPIO level translation. Use Value: Maintains ±5% regulation over temperature (-40°C to +125°C), ensuring consistent sensor readout accuracy despite battery voltage fluctuations. |
Use Scenario: Providing precise 12 V reference for op-amp-based bridge amplifier in pressure transducer front-end. IC Role / Device Role / Timing Role: Low-noise Zener reference replacing larger TO-92 parts to minimize board area in 4–20 mA loop transmitter PCBs. Use Value: 30 Ω ZZT limits reference drift under varying load currents, improving gain stability in analog signal chain. |
| Consumer Power Adapter Feedback | Medical Diagnostic Equipment Biasing |
Use Scenario: Secondary-side voltage sensing in isolated flyback converters for USB-C PD adapters. IC Role / Device Role / Timing Role: Zener clamping element in optocoupler feedback path to regulate output voltage within ±1%. Use Value: Tight 11.4–12.6 V tolerance enables accurate setpoint control without trimming resistors, reducing BOM count. |
Use Scenario: Generating stable 12 V bias for photodiode transimpedance amplifiers in portable blood oximeters. IC Role / Device Role / Timing Role: Low-leakage (1.0 µA @ 9.1 V) shunt reference minimizing dark-current error in high-gain analog stages. Use Value: Enables sub-10 nA input offset current budget in critical analog front-end design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584C12 | 12 V, ±5%, 300 mW, SOD-323 package, 40 Ω ZZT, 100 nA IR @ 9.1 V | Lower power rating and smaller footprint; higher ZZT limits ripple rejection | Select when board space is constrained and 300 mW suffices; verify thermal margin in enclosed enclosures |
| MMBZ5242B | 12 V, ±5%, 350 mW, SOT-23 package, 30 Ω ZZT, 1.0 µA IR @ 9.1 V | Same electrical specs but larger SOT-23 footprint; higher thermal resistance (400 °C/W) | Prefer when existing SOT-23 land pattern exists and rework cost outweighs SOD-123 thermal advantage |
Compared with BZX584C12 and MMBZ5242B, MMSZ5242B-7-F delivers superior thermal performance (338 °C/W vs. ≥400 °C/W) and higher power headroom (370 mW vs. ≤350 mW), making it optimal for sustained regulation in compact, thermally dense automotive and industrial modules.
Availability
MMSZ5242B-7-F is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, and consumer power adapter designs requiring stable component supply with full traceability and AEC-Q101 compliance.
Supply support for MMSZ5242B-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 centers across Asia and manufacturing in Taiwan and China.
MMSZ52xxB series belongs to Diodes' general-purpose Zener diode product line, engineered for cost-effective, high-reliability voltage regulation in automotive, industrial, and consumer power management systems.
FAQ
What is the maximum reverse voltage before breakdown for MMSZ5242B-7-F?
The nominal Zener voltage is 12.0 V with a guaranteed range of 11.4 V to 12.6 V at 20 mA test current. Breakdown begins near the minimum specified value (11.4 V), and the device maintains regulation across this band under controlled current conditions per the DS18010 datasheet.
Can MMSZ5242B-7-F be used in place of a 12 V Zener in an automotive lighting control circuit?
Yes - its AEC-Q101 qualification, -65°C to +150°C operating range, and 1.0 µA reverse leakage at 9.1 V make it suitable for LED driver biasing and PWM reference generation in headlight control modules, provided power dissipation remains within 370 mW at ambient temperature.
Does MMSZ5242B-7-F have polarity marking, and how is it identified?
Yes - the cathode is marked by a visible band on the top surface of the SOD-123 package. The unmarked end is the anode. This matches industry-standard polarity identification and aligns with JEDEC SOD-123 mechanical drawings published by Diodes Incorporated.
How does thermal derating affect MMSZ5242B-7-F's usable power at 85°C ambient?
Per Figure 1 in DS18010, power dissipation linearly derates from 370 mW at +25°C to approximately 270 mW at +85°C ambient on standard FR-4 PCB. This requires verifying that worst-case Zener current × voltage stays below 270 mW to avoid thermal runaway.
MMSZ5242B-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):
- 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:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
MMSZ5242B-7-F FAQ
1.How can I place an order for MMSZ5242B-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5242B-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 MMSZ5242B-7-F reliable?
The price and inventory of MMSZ5242B-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 MMSZ5242B-7-F is usually 5 days.
3.What payment methods are accepted for MMSZ5242B-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5242B-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5242B-7-F?
MMSZ5242B-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5242B-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 MMSZ5242B-7-F?
For technical support, including MMSZ5242B-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5242B-7-F requirements.
6.How does Aetrix verify that MMSZ5242B-7-F is sourced from the original manufacturer or authorized distributors?
All MMSZ5242B-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 MMSZ5242B-7-F meets industry standards.
7.What is the process for return or replacement of MMSZ5242B-7-F?
All MMSZ5242B-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5242B-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 MMSZ5242B-7-F part is unused and in its original packaging.
Return procedure for MMSZ5242B-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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