My Inquiry
My Account
Diodes Incorporated MMSZ5242BQ-7-F
- Part No.:
- MMSZ5242BQ-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5242BQ-7-F.pdf
- Description:
- DIODE ZENER 12V 370MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:2,501
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MMSZ5242BQ-7-F from Diodes Incorporated is an AEC-Q101 qualified 12 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 30 Ω zener impedance at 20 mA test current and 1.0 µA reverse leakage at 9.1 V. It serves as a precision voltage reference and overvoltage clamp in automotive power supply monitoring circuits.
For engineers reviewing the MMSZ5242BQ-7-F datasheet, MMSZ5242BQ-7-F pinout, MMSZ5242BQ-7-F application, or MMSZ5242BQ-7-F equivalent, this page delivers verified Zener voltage range (11.4–12.6 V), thermal resistance (338 °C/W), polarity marking (cathode band), RoHS/Green compliance status, and AEC-Q101 qualification evidence - all critical for automotive-grade BOM validation and PCB layout planning.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage regulation across varying load currents and temperature conditions. Its 12 V nominal Zener voltage exhibits a positive temperature coefficient of +0.06 %/°C, enabling predictable drift behavior in automotive ambient ranges (−40°C to +125°C).
The device uses alloy 42 leadframe with matte tin plating, solderable per MIL-STD-202 Method 208, and is packaged in halogen- and antimony-free green molding compound rated UL 94V-0. Moisture sensitivity level is J-STD-020 Level 1, supporting standard reflow profiles without baking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Nominal) | 12 V - precise clamping threshold for 12 V rail protection and reference generation |
| Zener Voltage Range | 11.4–12.6 V - ±5% tolerance ensures design margin for worst-case regulation |
| Test Current (IZT) | 20 mA - standard bias point for guaranteed Zener voltage and impedance specs |
| Zener Impedance (ZZT) | 30 Ω @ 20 mA - low dynamic resistance enables stable regulation under transient load changes |
| Power Dissipation | 370 mW @ TA = +25°C - defines maximum continuous DC power on FR-4 board with 1-inch copper pad |
| Reverse Leakage (IR) | 1.0 µA @ VR = 9.1 V - confirms low standby current in undervoltage detection circuits |
| Thermal Resistance (RθJA) | 338 °C/W - determines junction temperature rise under given power and ambient conditions |
Pinout & Package
Package: SOD123 surface-mount plastic case with cathode band marking; dimensions: 2.65 mm × 1.55 mm × 1.05 mm (L × D × A); weight ≈ 0.01 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side of regulated circuit; forms reference ground for shunt regulator topology |
| Cathode | Reverse-biased Zener terminal / voltage clamp input | Connected to protected node (e.g., microcontroller VDD); conducts when voltage exceeds 12 V threshold |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control units and body electronics |
| Green molding compound | UL 94V-0 flammability rating and <900 ppm Br/Cl content meet strict environmental compliance |
| Lead-free & RoHS compliant | No purposely added lead; fully compliant with EU Directive 2011/65/EU (RoHS 2) |
| Automated assembly compatibility | SOD123 footprint supports high-speed pick-and-place and reflow soldering without tombstoning |
Applications
| Automotive Power Rail Monitoring | Industrial Sensor Reference Supply |
|---|---|
Use Scenario: Real-time monitoring of 12 V battery rail in ADAS camera modules during cold cranking and load dump events. IC Role / Device Role / Timing Role: Shunt voltage clamp protecting downstream LDOs and microcontrollers from overvoltage transients. Use Value: Maintains regulation within ±5% over −40°C to +125°C, preventing false resets during thermal cycling. |
Use Scenario: Providing stable 12 V reference for 4–20 mA loop-powered pressure transmitters in factory automation. IC Role / Device Role / Timing Role: Precision voltage reference for DAC output stage and analog front-end biasing. Use Value: 30 Ω Zener impedance minimizes output voltage variation under sensor load fluctuations up to ±5 mA. |
| Consumer USB-C PD Protection | Medical Diagnostic Equipment Biasing |
Use Scenario: Overvoltage clamping on USB-C power delivery negotiation lines exposed to ESD and cable insertion surges. IC Role / Device Role / Timing Role: Transient voltage suppressor for communication bus integrity in portable diagnostic tools. Use Value: 1.0 µA leakage at 9.1 V ensures negligible current draw on low-power I²C/SMBus lines. |
Use Scenario: Generating stable bias voltage for op-amp-based signal conditioning in portable ultrasound probe front-ends. IC Role / Device Role / Timing Role: Low-noise voltage reference for analog signal chain calibration and offset trimming. Use Value: Positive TC (+0.06 %/°C) allows predictable compensation against amplifier drift in handheld devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C12LT1G | 12 V ±5%, SOT-23 package, 350 mW PD, 30 Ω ZZT @ 5 mA | Lower power rating and different test current reduce regulation stability under higher load | Prefer for space-constrained consumer PCBs where thermal margin is sufficient |
| 1N4742A | 12 V ±5%, DO-41 through-hole, 1 W PD, 22 Ω ZZT @ 20 mA | Larger footprint and manual assembly requirement limit use in automated SMT lines | Choose for prototyping or legacy through-hole designs requiring higher power headroom |
Compared with BZX84-C12LT1G and 1N4742A, MMSZ5242BQ-7-F uniquely combines AEC-Q101 qualification, SOD123 SMT compatibility, and 370 mW power handling - making it the only option validated for production automotive modules requiring both reliability and automated manufacturing support.
Availability
MMSZ5242BQ-7-F is available at Aetrix Electronics and suitable for automotive power management, industrial sensor interface, and medical diagnostic equipment requiring stable component supply with full traceability and long-term lifecycle assurance.
Supply support for MMSZ5242BQ-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, specializing in high-reliability components for automotive, industrial, and computing markets.
MMSZ5242BQ-7-F belongs to the MMSZ52xxB automotive Zener diode series, designed specifically for AEC-Q101-compliant voltage reference and overvoltage protection in harsh-environment electronic control units.
FAQ
What is the maximum operating temperature for MMSZ5242BQ-7-F?
The device supports continuous operation from −65°C to +150°C for both junction and storage temperatures. Its derating curve shows linear power reduction above +25°C ambient, reaching zero dissipation at +150°C on FR-4 board with specified copper pad layout.
Is MMSZ5242BQ-7-F compatible with lead-free reflow soldering?
Yes - it features matte tin finish annealed over alloy 42 leadframe and is qualified for standard Pb-free reflow profiles per JEDEC J-STD-020. The SOD123 package has moisture sensitivity level 1, eliminating pre-bake requirements.
How does the Zener voltage tolerance affect circuit design margin?
The ±5% tolerance (11.4–12.6 V) defines worst-case clamping window. Designers must ensure downstream ICs tolerate this full range - e.g., a 12 V LDO with 13.2 V absolute max input requires ≥1.2 V headroom to avoid damage during worst-case Zener conduction.
What is the significance of the 'Q' in MMSZ5242BQ-7-F?
The 'Q' suffix denotes AEC-Q101 qualification per Diodes Incorporated's internal part numbering convention. It confirms the device underwent stress testing for automotive reliability including HTOL, TCT, and ESD per AEC standards - distinct from commercial-grade MMSZ5242B-7-F.
MMSZ5242BQ-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:
- 370 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 (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
MMSZ5242BQ-7-F FAQ
1.How can I place an order for MMSZ5242BQ-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5242BQ-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 MMSZ5242BQ-7-F reliable?
The price and inventory of MMSZ5242BQ-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 MMSZ5242BQ-7-F is usually 5 days.
3.What payment methods are accepted for MMSZ5242BQ-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5242BQ-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5242BQ-7-F?
MMSZ5242BQ-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5242BQ-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 MMSZ5242BQ-7-F?
For technical support, including MMSZ5242BQ-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5242BQ-7-F requirements.
6.How does Aetrix verify that MMSZ5242BQ-7-F is sourced from the original manufacturer or authorized distributors?
All MMSZ5242BQ-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 MMSZ5242BQ-7-F meets industry standards.
7.What is the process for return or replacement of MMSZ5242BQ-7-F?
All MMSZ5242BQ-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5242BQ-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 MMSZ5242BQ-7-F part is unused and in its original packaging.
Return procedure for MMSZ5242BQ-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMSZ5242BQ-7-F Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
