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Diodes Incorporated MMSZ5242BS-7-F
- Part No.:
- MMSZ5242BS-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
MMSZ5242BS-7-F.pdf
- Description:
- DIODE ZENER 12V 200MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:253,236
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Product details
Overview
MMSZ5242BS-7-F 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 20 mA, 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-F datasheet, MMSZ5242BS-7-F pinout, MMSZ5242BS-7-F application, or MMSZ5242BS-7-F equivalent, key selection criteria include Zener voltage tolerance (±5%), low leakage at VR = 9.1 V, thermal resistance (625 °C/W), and compatibility with automated SMT assembly on FR-4 PCBs.
Technical Context
This Zener diode employs planar die construction for stable breakdown characteristics and tight voltage distribution across production lots. Its SOD-323 package enables high-density placement while maintaining thermal performance under pulsed or continuous DC bias conditions.
Designed for general-purpose voltage regulation and reference functions, it operates within -65°C to +150°C ambient range and exhibits typical capacitance of ~2 pF at 0 V bias (f = 1 MHz), making it suitable for low-noise, low-frequency stabilization rather than RF applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 12.0 V nominal, 11.4–12.6 V range at IZT = 20 mA - defines stable regulation point for feedback or clamping |
| Power Dissipation (PD) | 200 mW at TA = 25°C - limits maximum continuous current to ~16.7 mA at 12 V without heatsinking |
| Zener Impedance (ZZT) | 30 Ω at IZT = 20 mA - indicates moderate regulation stiffness; voltage shift <0.6 V per ±20 mA load change |
| Reverse Leakage (IR) | ≤1.0 µA at VR = 9.1 V - ensures minimal error current in high-impedance reference nodes |
| Thermal Resistance (RθJA) | 625 °C/W - requires careful PCB copper area design to avoid junction overheating above 25°C ambient |
| Forward Voltage (VF) | 0.9 V at IF = 10 mA - usable as low-drop rectifier or ESD protection anode in bidirectional configurations |
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 thickness), cathode marked by band on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to lower-potential node in Zener mode | Must be routed to ground or common return when used as shunt regulator |
| Cathode | Current exit terminal in forward bias; connected to higher-potential node in Zener mode | Banded end - ties to regulated voltage node; determines polarity of clamping action |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Ensures consistent Zener voltage distribution and long-term stability under thermal cycling |
| SOD-323 package | Enables 0.65 mm pitch placement and compatibility with standard 8 mm tape-and-reel feeders (3000 pcs/reel) |
| Lead-free & RoHS-compliant | Meets EU Directive 2011/65/EU; matte tin plating over Alloy 42 leadframe eliminates Pb and halogen risks |
| Moisture sensitivity Level 1 | Allows unlimited floor life before reflow; no baking required prior to assembly |
Applications
| Power Supply Monitoring | ADC Reference Stabilization |
|---|---|
Use Scenario: Detecting undervoltage condition in 12 V rail of microcontroller-based sensor node. IC Role / Device Role / Timing Role: Shunt regulator providing stable 12 V threshold for comparator input. Use Value: Tight 11.4–12.6 V tolerance ensures reliable trip point across temperature and unit-to-unit variation. |
Use Scenario: Biasing precision 2.5 V bandgap reference IC requiring clean 5 V supply. IC Role / Device Role / Timing Role: Low-leakage clamp limiting supply rail overshoot during LDO transient response. Use Value: ≤1.0 µA leakage at 9.1 V prevents loading error in high-impedance reference divider networks. |
| Signal Level Clamping | Overvoltage Protection |
Use Scenario: Protecting op-amp input stage from ±15 V transients in industrial analog front-end. IC Role / Device Role / Timing Role: Bidirectional clamp using two MMSZ5242BS-7-F back-to-back (anode-to-anode). Use Value: 0.9 V forward drop and 12 V reverse breakdown provide symmetric ±12.9 V clamping window. |
Use Scenario: Safeguarding USB-C CC line against accidental 20 V adapter misconnection. IC Role / Device Role / Timing Role: Standby shunt limiter activated only during fault events. Use Value: 200 mW rating supports short-duration 20 V × 10 mA faults without thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B12,115 (Nexperia) | Same 12 V nominal, ±5% tolerance, but 300 mW rating and SOD-323 package; ZZT = 20 Ω @ 5 mA | Lower test current (5 mA vs. 20 mA) yields tighter low-current regulation but higher dynamic impedance at full bias | Select when operating near 5 mA or needing higher power margin; verify thermal layout for 300 mW derating |
| MMBZ5242BLT1G (onsemi) | Identical 12 V spec, same SOD-323, but 225 mW rating and ZZT = 35 Ω @ 20 mA; RoHS compliant with NiPdAu plating | Slightly higher impedance reduces regulation accuracy under load; different plating may affect solder wetting | Prefer for legacy onsemi BOM continuity; confirm plating compatibility with lead-free SAC305 reflow profile |
Compared with BZX384-B12 and MMBZ5242BLT1G, MMSZ5242BS-7-F offers balanced impedance and leakage at its 20 mA test point, optimized for mid-current reference use with proven manufacturability in high-volume SMT lines.
Availability
MMSZ5242BS-7-F is available at Aetrix Electronics and suitable for power supply monitoring, ADC reference stabilization, signal level clamping, and overvoltage protection requiring stable component supply and full RoHS compliance.
Supply support for MMSZ5242BS-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 and manufacturing operations across Asia and the Americas.
MMSZ5242BS-7-F belongs to the MMSZ52xxBS series of general-purpose Zener diodes, engineered for cost-effective, high-yield voltage reference and protection in consumer, industrial, and computing applications.
FAQ
What is the maximum continuous Zener current for MMSZ5242BS-7-F at 70°C ambient?
At TA = 70°C, derated power is 125 mW (per Fig. 1). With VZ ≈ 12 V, maximum continuous current is ~10.4 mA. Exceeding this risks junction temperature exceeding 150°C, especially without thermal relief pads.
Can MMSZ5242BS-7-F be used in place of a 12 V Zener in a linear regulator feedback network?
Yes - its 11.4–12.6 V tolerance and 30 Ω impedance support stable feedback in adjustable regulators like LM317. However, ensure total current through the Zener (including divider current) stays below 16.7 mA at 25°C to maintain regulation accuracy.
Does the SOD-323 package require special PCB layout considerations?
Yes - Diodes Incorporated recommends the AP02001 pad layout (0.59 mm pad width, 2.7 mm overall length) to ensure solder joint reliability and thermal conduction. Avoid oversized pads that increase thermal resistance or cause tombstoning.
Is MMSZ5242BS-7-F suitable for automotive applications?
No - it is not AEC-Q200 qualified. While its -65°C to +150°C operating range meets temperature requirements, it lacks automotive-grade qualification testing (e.g., HTOL, temperature cycling, board-level reliability), so use in automotive ECUs is not recommended.
MMSZ5242BS-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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-F FAQ
1.How can I place an order for MMSZ5242BS-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5242BS-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 MMSZ5242BS-7-F reliable?
The price and inventory of MMSZ5242BS-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 MMSZ5242BS-7-F is usually 5 days.
3.What payment methods are accepted for MMSZ5242BS-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5242BS-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5242BS-7-F?
MMSZ5242BS-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5242BS-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 MMSZ5242BS-7-F?
For technical support, including MMSZ5242BS-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5242BS-7-F requirements.
6.How does Aetrix verify that MMSZ5242BS-7-F is sourced from the original manufacturer or authorized distributors?
All MMSZ5242BS-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 MMSZ5242BS-7-F meets industry standards.
7.What is the process for return or replacement of MMSZ5242BS-7-F?
All MMSZ5242BS-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5242BS-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 MMSZ5242BS-7-F part is unused and in its original packaging.
Return procedure for MMSZ5242BS-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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