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Diodes Incorporated MMSZ5246B-7
- Part No.:
- MMSZ5246B-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5246B-7.pdf
- Description:
- DIODE ZENER 16V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:2,342
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Product details
Overview
MMSZ5246B-7 from Diodes Incorporated is a 16V, 500mW surface-mount Zener diode in SOD-123 package, rated for 7.8mA test current with 17Ω dynamic impedance at 1kHz and 0.1μA reverse leakage at 12V, widely used for voltage regulation and reference in power supply feedback loops and overvoltage protection circuits.
For engineers reviewing the MMSZ5246B-7 datasheet, MMSZ5246B-7 pinout, MMSZ5246B-7 application, or MMSZ5246B-7 equivalent, key selection criteria include nominal Zener voltage tolerance (±5%), thermal resistance (338°C/W), AEC-Q101 qualification status, and SOD-123 footprint compatibility with automated PCB assembly processes.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable voltage across its terminals under varying load and temperature conditions. Its 16V nominal Zener voltage exhibits a positive temperature coefficient of approximately +0.07%/°C, enabling predictable drift behavior in precision references.
The device delivers regulated output within ±5% tolerance (15.2–16.8V) at 7.8mA test current, with low dynamic impedance (17Ω @ 1kHz) ensuring minimal voltage variation under transient current changes, and supports operation from −65°C to +150°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 16 V ±5% - defines stable regulation point for feedback or clamping applications |
| Test Current (IZT) | 7.8 mA - operating point where Zener voltage and impedance are specified |
| Zener Impedance (ZZT) | 17 Ω @ 1 kHz - low AC impedance ensures tight voltage regulation under dynamic loads |
| Max Reverse Leakage (IR) | 0.1 μA @ 12 V - negligible standby current enables low-power biasing and sensing |
| Power Dissipation | 370 mW @ TA = 25°C - sets maximum continuous DC power handling on standard FR-4 PCB |
| Thermal Resistance (RθJA) | 338 °C/W - determines junction temperature rise above ambient under given power load |
| Operating Temperature | −65°C to +150°C - supports automotive under-hood and industrial control environments |
Pinout & Package
Package: SOD-123 - compact surface-mount plastic case with cathode band marking, 1.05 mm height, 2.65 mm width, and 3.65 mm length; compatible with reflow soldering and automated pick-and-place equipment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side in reverse-biased regulation configuration |
| Cathode | Zener breakdown terminal / voltage reference output | Marked by band; connected to higher-potential side to enable controlled reverse conduction |
Key Features
| Feature | Design Value |
|---|---|
| 500mW Power Dissipation | Enables robust voltage clamping in mid-power analog and power supply circuits without heatsinking |
| AEC-Q101 Qualified | Validated for automotive electronics including engine control units and body modules |
| SOD-123 Footprint | Standardized 2-pin SMT outline ensures board-level interoperability and automated assembly compatibility |
| Lead-Free & Halogen-Free | Meets RoHS 2 and automotive green standards with <900 ppm Br/Cl and <1000 ppm Sb |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Analog Input Module |
|---|---|
Use Scenario: Regulating reference voltage for ADC biasing and sensor signal conditioning in harsh-temperature ECU environments. IC Role / Device Role / Timing Role: Zener voltage reference providing stable 16V rail for op-amp bias networks and comparator thresholds. Use Value: Maintains ±0.8V regulation accuracy across −40°C to +125°C, supporting AEC-Q101-compliant system reliability. | Use Scenario: Clamping transient overvoltage on 24V fieldbus inputs exposed to inductive switching noise. IC Role / Device Role / Timing Role: Protective shunt element diverting surge energy before it reaches downstream protection ICs or microcontrollers. Use Value: Responds within nanoseconds to 12V transients, limiting peak voltage to ≤16.8V with <0.1μA leakage at operating bias. |
| Consumer Power Adapter Feedback Loop | Medical Diagnostic Equipment Reference |
Use Scenario: Providing precise 16V reference for optocoupler-based feedback in isolated AC/DC flyback converters. IC Role / Device Role / Timing Role: Primary-side Zener reference setting output voltage via TL431-compatible feedback path. Use Value: Delivers 17Ω impedance at 1kHz to minimize feedback loop phase shift and improve transient response stability. | Use Scenario: Generating calibrated bias voltage for photodiode amplifier stages in portable blood analyzers. IC Role / Device Role / Timing Role: Low-drift voltage reference source for ultra-low-noise transimpedance amplifiers. Use Value: Enables <0.07%/°C TC tracking and sub-μA leakage-critical for maintaining calibration integrity over clinical operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584C16 | 16V ±5%, 300mW rating, SOD-323 package, 40Ω ZZT | Lower power and higher impedance limit use to low-current references only | Select when board space is constrained and power dissipation remains <150mW |
| MMBZ5246B | Same electrical specs, SOT-23 package, 3-pin layout with unused emitter | Requires different footprint and may introduce parasitic capacitance in RF-sensitive designs | Choose for legacy SOT-23 board reuse or dual-diode configurations |
Compared with BZX584C16 and MMBZ5246B, MMSZ5246B-7 offers superior thermal performance (338°C/W vs. ~450°C/W), tighter impedance control (17Ω vs. 40Ω), and optimized SOD-123 manufacturability-making it preferred for high-reliability, medium-power regulation where footprint and thermal margin are balanced.
Availability
MMSZ5246B-7 is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, and consumer power adapter designs requiring stable component supply and AEC-Q101-compliant Zener regulation.
Supply support for MMSZ5246B-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 MMSZ52xxB series belongs to Diodes' general-purpose Zener diode product line, engineered for cost-effective, high-yield voltage regulation and protection in commercial and automotive applications with stringent environmental requirements.
FAQ
What is the maximum power dissipation of MMSZ5246B-7 at 75°C ambient?
The MMSZ5246B-7 is rated for 500mW power dissipation at lead temperature (TL) = 75°C per datasheet Note 4. At ambient temperature (TA) = 75°C, derating applies: using the 338°C/W RθJA, maximum allowable power drops to approximately 220mW to keep junction temperature below 150°C.
Is MMSZ5246B-7 suitable for use in automotive applications?
Yes-MMSZ5246B-7 is explicitly qualified to AEC-Q101 standards for high-reliability automotive use. It meets stress testing requirements for temperature cycling, humidity, mechanical shock, and ESD, and is commonly deployed in engine control units, body electronics, and infotainment power rails.
How does the cathode band identify polarity on the SOD-123 package?
The cathode band is a visible molded stripe near one end of the SOD-123 case, aligned with the cathode terminal. When viewed from the top with the band on the left, the left pad is cathode and the right pad is anode-consistent with JEDEC-standard SOD-123 orientation and PCB silkscreen conventions.
What is the typical temperature coefficient of MMSZ5246B-7's Zener voltage?
Per Figure 6 in the datasheet, MMSZ5246B-7 (16V type) exhibits a typical temperature coefficient of +0.07%/°C. This positive TC means its Zener voltage increases by ~11.2mV per 1°C rise, enabling predictable compensation in multi-Zener reference designs.
MMSZ5246B-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 16 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 17 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 12 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
MMSZ5246B-7 FAQ
1.How can I place an order for MMSZ5246B-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5246B-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 MMSZ5246B-7 reliable?
The price and inventory of MMSZ5246B-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5246B-7 is usually 5 days.
3.What payment methods are accepted for MMSZ5246B-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5246B-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5246B-7?
MMSZ5246B-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5246B-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 MMSZ5246B-7?
For technical support, including MMSZ5246B-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5246B-7 requirements.
6.How does Aetrix verify that MMSZ5246B-7 is sourced from the original manufacturer or authorized distributors?
All MMSZ5246B-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 MMSZ5246B-7 meets industry standards.
7.What is the process for return or replacement of MMSZ5246B-7?
All MMSZ5246B-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5246B-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 MMSZ5246B-7 part is unused and in its original packaging.
Return procedure for MMSZ5246B-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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