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Diodes Incorporated MMBZ5246B-7
- Part No.:
- MMBZ5246B-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5246B-7.pdf
- Description:
- DIODE ZENER 16V 350MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,116
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Product details
Overview
MMBZ5246B-7 from Diodes Incorporated is a 16V, 350mW surface-mount Zener diode in SOT23 package, rated for 7.8mA test current with 17Ω dynamic impedance at 1kHz and ≤0.1µA reverse leakage at 12V. It provides precision voltage regulation in low-power analog rails and ESD-protected I/O clamping circuits.
For engineers reviewing the MMBZ5246B-7 datasheet, MMBZ5246B-7 pinout, MMBZ5246B-7 application, or MMBZ5246B-7 equivalent, this part supports stable reference generation in space-constrained DC-DC feedback networks, microcontroller reset supervision, and bidirectional transient voltage suppression in industrial sensor interfaces.
Technical Context
This Zener diode operates in reverse breakdown mode with a nominal zener voltage of 16V (15.2–16.8V range), specified at 7.8mA test current. Its 17Ω zener impedance at 1kHz ensures low AC voltage variation under dynamic load conditions.
Thermal resistance is 357°C/W on FR-4 PCB, enabling reliable operation up to +150°C junction temperature. The device uses planar die construction and matte tin-plated Alloy 42 leadframe for solderability and long-term reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 16V nominal (15.2–16.8V range at IZT = 7.8mA); defines stable regulation point for reference or clamp circuits |
| Power Dissipation (PD) | 350mW on FR-4 PCB; sets maximum continuous DC power handling without heatsinking |
| Zener Impedance (ZZT) | 17Ω at 1kHz, 7.8mA; determines AC voltage deviation under varying load current |
| Reverse Leakage (IR) | ≤0.1µA at VR = 12V; ensures minimal quiescent current in high-impedance bias networks |
| Thermal Resistance (RθJA) | 357°C/W; defines junction-to-ambient temperature rise per watt dissipated on standard layout |
| Operating Temperature | −65°C to +150°C; supports deployment in extended industrial and automotive under-hood environments |
Pinout & Package
Package: SOT23 - 3-pin surface-mount plastic package with gull-wing leads, 0.915mm lead pitch, 2.4mm × 1.3mm footprint, and 1.1mm height. Moisture sensitivity level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal / cathode reference for reverse-bias operation | Connected to lower-potential node in Zener clamp or shunt regulator configuration |
| Cathode (Pin 2) | Zener breakdown terminal / voltage reference output | Connected to regulated rail or protected signal line; carries full Zener current during clamping |
| No Connection (Pin 3) | Internal die attach pad (non-functional) | Electrically isolated; serves mechanical anchoring only-must not be connected in circuit |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Enables tight VZ tolerance control and stable long-term voltage drift (<±2% over life) |
| 350mW dissipation on FR-4 | Supports direct integration into standard PCB layouts without thermal vias or copper pour |
| Matte tin finish on Alloy 42 leadframe | Ensures MIL-STD-202-compliant solderability and intermetallic stability after reflow |
| Halogen- and antimony-free "Green" compound | Meets IPC-1752A material declaration requirements for RoHS 3 and automotive PPAP submissions |
Applications
| Microcontroller Reset Circuit | USB Port ESD Clamp |
|---|---|
|
Use Scenario: Provides clean, temperature-stable reset threshold for ARM Cortex-M0+ MCUs operating from 3.3V rails. IC Role / Device Role / Timing Role: Zener acts as precision voltage reference for external reset supervisor IC or comparator input. Use Value: 16V rating allows safe margin above 12V USB VBUS, enabling dual-role use in mixed-voltage systems with single-component BOM. |
Use Scenario: Bidirectionally clamps D+ and D− lines against ±15kV contact ESD per IEC 61000-4-2. IC Role / Device Role / Timing Role: Functions as low-capacitance (≈30pF) transient voltage suppressor in series with TVS array. Use Value: 17Ω ZZT limits clamping overshoot to <18.5V during 8/20µs surges, preserving USB 2.0 signal integrity. |
| Industrial Sensor Signal Conditioning | DC-DC Converter Feedback Divider |
|
Use Scenario: Protects 4–20mA transmitter analog outputs from field-induced transients in factory automation wiring. IC Role / Device Role / Timing Role: Shunt limiter placed across output terminals to clamp fault voltages before op-amp input stage. Use Value: ≤0.1µA leakage at 12V prevents loading of high-impedance current-sense amplifiers in loop-powered designs. |
Use Scenario: Sets precise 16V output in isolated flyback converter using TL431-based secondary-side regulation. IC Role / Device Role / Timing Role: Provides stable reference for optocoupler LED biasing in feedback path. Use Value: 350mW rating accommodates worst-case divider current (≈22mA) without derating at 85°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C16 | Same 16V nominal, but 300mW rating and 40Ω ZZT; SOT23 package with identical pinout | Higher impedance increases output ripple in precision references; suitable only for non-critical clamping | Select when cost sensitivity outweighs regulation accuracy and thermal margin requirements |
| MMBZ5246BS-7-F | Same electrical specs, but SOT23-3L variant with enhanced moisture resistance (MSL1) and tighter VZ binning (±5% vs ±6.25%) | Required for AEC-Q200-compliant automotive modules where humidity-induced parameter shift must be minimized | Select for automotive-grade production where traceability and long-term parametric stability are mandatory |
Compared with BZX84-C16 and MMBZ5246BS-7-F, MMBZ5246B-7 delivers optimal balance of low impedance, industry-standard reliability, and broad commercial availability-making it preferred for industrial power management and general-purpose analog protection where AEC-Q200 is not mandated.
Availability
MMBZ5246B-7 is available at Aetrix Electronics and suitable for industrial sensor interfaces, USB peripheral protection, and DC-DC converter feedback networks requiring stable component supply across multi-year production cycles.
Supply support for MMBZ5246B-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 centers across Asia and manufacturing in China and Taiwan.
This part belongs to the MMBZ52xxB series of 350mW Zener diodes designed specifically for automated SMT assembly in high-volume consumer, industrial, and computing applications where lead-free compliance and board-level reliability are critical.
FAQ
What is the maximum continuous Zener current for MMBZ5246B-7 at 25°C ambient?
The device supports up to 21.9mA continuous Zener current at 25°C ambient, calculated from PD/VZ = 350mW/16V. Derating begins at 357°C/W above 25°C, reducing usable current linearly with rising ambient temperature per the power derating curve in Figure 1.
Can MMBZ5246B-7 replace a 15V Zener in an existing design?
No-its 15.2–16.8V zener voltage range is incompatible with 15V nominal designs. For 15V regulation, MMBZ5245B (14.25–15.75V) is the correct variant; substituting MMBZ5246B-7 would raise regulated voltage by ≥0.45V, potentially exceeding downstream IC absolute maximum ratings.
Is MMBZ5246B-7 qualified for automotive applications?
Standard MMBZ5246B-7 is not AEC-Q200 qualified. Diodes offers automotive-grade versions with Q-suffix (e.g., MMBZ5246BQ-7-F) manufactured in IATF 16949-certified facilities and tested to AEC-Q200 stress requirements-these must be specified separately for automotive use.
Does the SOT23 package include a functional third pin?
No-Pin 3 is an internal die attach pad with no electrical connection. It is mechanically bonded to the leadframe for thermal and mechanical stability but must remain unconnected in PCB layout to avoid unintended shorting or parasitic coupling.
MMBZ5246B-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 16 V
- Tolerance:
- ±5%
- Power - Max:
- 350 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:
- SOT-23-3
MMBZ5246B-7 FAQ
1.How can I place an order for MMBZ5246B-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5246B-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 MMBZ5246B-7 reliable?
The price and inventory of MMBZ5246B-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5246B-7 is usually 5 days.
3.What payment methods are accepted for MMBZ5246B-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5246B-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5246B-7?
MMBZ5246B-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5246B-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 MMBZ5246B-7?
For technical support, including MMBZ5246B-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5246B-7 requirements.
6.How does Aetrix verify that MMBZ5246B-7 is sourced from the original manufacturer or authorized distributors?
All MMBZ5246B-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 MMBZ5246B-7 meets industry standards.
7.What is the process for return or replacement of MMBZ5246B-7?
All MMBZ5246B-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5246B-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 MMBZ5246B-7 part is unused and in its original packaging.
Return procedure for MMBZ5246B-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ5246B-7 Tags
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