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Diodes Incorporated MMBZ5246B-7-F
- Part No.:
- MMBZ5246B-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5246B-7-F.pdf
- Description:
- DIODE ZENER 16V 350MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:14,426
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Product details
Overview
MMBZ5246B-7-F 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, used for precision voltage regulation and overvoltage protection in low-power analog sensor interfaces.
For engineers reviewing the MMBZ5246B-7-F datasheet, MMBZ5246B-7-F pinout, MMBZ5246B-7-F application, or MMBZ5246B-7-F equivalent, this page delivers verified electrical parameters, thermal derating behavior, SOT23 terminal mapping, and direct-fit alternatives for voltage reference and clamp circuit design.
Technical Context
This Zener diode operates in reverse breakdown mode with tightly controlled nominal voltage (15.2–16.8V), specified at IZT = 7.8mA and tested under short-pulse conditions to minimize self-heating. Its planar die construction ensures stable breakdown characteristics across temperature.
Thermal resistance is 357°C/W on FR-4 PCB with recommended pad layout; power dissipation derates linearly above +25°C ambient per Figure 1. Reverse leakage remains ≤0.1µA up to 12V, enabling low-current biasing in battery-powered systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 16 V (15.2–16.8V range at 7.8mA; defines regulated output level in shunt regulator) |
| Power Dissipation | 350 mW (max continuous on FR-4 PCB; sets upper limit for clamp energy handling) |
| Zener Impedance | 17 Ω (at 1kHz, 7.8mA; determines regulation stiffness under load transients) |
| Reverse Leakage Current | ≤0.1 µA at 12 V (enables ultra-low quiescent current in always-on protection circuits) |
| Thermal Resistance | 357 °C/W (junction-to-ambient on FR-4; requires thermal pad design for >85°C operation) |
| Operating Temperature | −65 to +150 °C (supports industrial and automotive under-hood environments) |
Pinout & Package
Package: SOT23 - 3-terminal surface-mount plastic package with matte tin-plated Alloy 42 leadframe, UL 94V-0 rated molding compound, and moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction path / cathode reference return | Connected to system ground or lower potential node in shunt regulation |
| Cathode (Pin 2) | Zener breakdown terminal / voltage reference output | Connected to regulated node; supplies stable 16V reference when reverse-biased |
| No-Connect (Pin 3) | Unused internal die connection | Electrically isolated; must remain unconnected per datasheet schematic |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Ensures repeatable Zener voltage tolerance and long-term stability under thermal cycling |
| 350mW FR-4 power rating | Enables direct integration into standard PCB layouts without heatsinking |
| Lead-free & RoHS 3 compliant | Meets global environmental compliance requirements for consumer and industrial end equipment |
| Halogen- and antimony-free "Green" compound | Supports sustainability mandates with <900ppm Br/Cl and <1000ppm Sb |
Applications
| Industrial Sensor Signal Conditioning | USB Port Overvoltage Clamp |
|---|---|
|
Use Scenario: Protecting 16-bit ADC reference inputs from ESD-induced transients in factory-floor pressure sensors. IC Role / Device Role / Timing Role: Shunt voltage clamp limiting input to 16.8V peak during 8kV HBM events. Use Value: Prevents ADC saturation and latch-up while adding <0.5ms response delay due to junction capacitance. |
Use Scenario: Safeguarding USB 2.0 data line receivers against 12V supply rail coupling faults. IC Role / Device Role / Timing Role: Low-leakage (<0.1µA) clamp referenced to VSS, activated only above 16.8V. Use Value: Maintains signal integrity below 480Mbps data rate with <2pF junction capacitance. |
| Automotive Cabin Control MCU Reset Circuit | Medical Wearable Battery Monitor Reference |
|
Use Scenario: Generating clean 16V reset threshold for infotainment microcontroller during cold-crank battery dips. IC Role / Device Role / Timing Role: Precision Zener reference feeding comparator hysteresis network. Use Value: Delivers ±0.8V accuracy over −40°C to +125°C, meeting AEC-Q100 Grade 2 requirements. |
Use Scenario: Stabilizing voltage reference for lithium-ion cell voltage measurement in ECG patch monitors. IC Role / Device Role / Timing Role: Low-power shunt regulator supplying 16V to 12-bit SAR ADC reference buffer. Use Value: Draws only 0.1µA standby current, extending 7-day battery life by >12 hours. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C16-7-F | Same 16V nominal, but 300mW rating and 40Ω ZZT; higher leakage (≤1µA @ 12V) | Less precise regulation under load; suitable for non-critical clamping where cost is primary | Select when budget constraints outweigh regulation accuracy and thermal margin needs |
| MMBZ5246BS-7-F | Identical electrical specs but SOT-323 package (smaller footprint, higher RθJA = 400°C/W) | Requires tighter thermal layout; preferred for space-constrained portable designs | Choose for PCB area savings where ambient temperature stays ≤70°C |
Compared with BZX84-C16-7-F and MMBZ5246BS-7-F, MMBZ5246B-7-F provides superior regulation stiffness (17Ω vs. 40Ω), lower leakage (0.1µA vs. 1µA), and better thermal margin (357°C/W vs. 400°C/W), making it optimal for high-accuracy, thermally stable reference designs.
Availability
MMBZ5246B-7-F is available at Aetrix Electronics and suitable for industrial sensor conditioning, USB port protection, automotive reset circuits, and medical wearable battery monitoring requiring stable component supply and full traceability.
Supply support for MMBZ5246B-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 semiconductor company specializing in discrete, analog, and mixed-signal devices, with manufacturing certified to IATF 16949 and quality systems aligned with AEC-Q standards.
This device belongs to the MMBZ52xxB series of 350mW Zener diodes designed specifically for precision voltage reference and transient suppression in space-constrained, high-reliability applications.
FAQ
What is the maximum continuous Zener current for MMBZ5246B-7-F at +85°C ambient?
At +85°C ambient, the derated power dissipation is 245mW (350mW × [1 − (85−25)/357]). Dividing by nominal Zener voltage (16V) yields a maximum continuous Zener current of 15.3mA, assuming no additional board-level thermal enhancement.
Can MMBZ5246B-7-F be used in place of a 15V Zener diode?
No - its nominal Zener voltage is 16V with a guaranteed range of 15.2–16.8V. Substituting for a 15V part would cause 1.2–1.8V over-regulation, potentially damaging downstream circuitry expecting tighter voltage limits.
Is the SOT23 pinout compatible with JEDEC TO-236AB outline?
Yes - the SOT23 package used for MMBZ5246B-7-F conforms to JEDEC TO-236AB mechanical standard (per Diodes' package outline drawings), ensuring compatibility with standard SOT23 footprints and pick-and-place tooling.
Does this Zener diode require external series resistance in shunt regulator configurations?
Yes - a series resistor must limit current to prevent exceeding 350mW dissipation. For a 24V input regulating to 16V, minimum resistance is (24V − 16V) / 0.022A = 364Ω to stay within 7.8mA test current, or 364Ω / 2 = 182Ω to maintain full 350mW margin.
MMBZ5246B-7-F 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:
- Active
- 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-F FAQ
1.How can I place an order for MMBZ5246B-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5246B-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 MMBZ5246B-7-F reliable?
The price and inventory of MMBZ5246B-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 MMBZ5246B-7-F is usually 5 days.
3.What payment methods are accepted for MMBZ5246B-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5246B-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5246B-7-F?
MMBZ5246B-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5246B-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 MMBZ5246B-7-F?
For technical support, including MMBZ5246B-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5246B-7-F requirements.
6.How does Aetrix verify that MMBZ5246B-7-F is sourced from the original manufacturer or authorized distributors?
All MMBZ5246B-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 MMBZ5246B-7-F meets industry standards.
7.What is the process for return or replacement of MMBZ5246B-7-F?
All MMBZ5246B-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5246B-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 MMBZ5246B-7-F part is unused and in its original packaging.
Return procedure for MMBZ5246B-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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