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onsemi MM3Z68VB
- Part No.:
- MM3Z68VB
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SC-90, SOD-323F
- Datasheet:
-
MM3Z68VB.pdf
- Description:
- DIODE ZENER 68V 200MW SOD323F
- Quantity:
- Payment:
- Shipping:
Inventory:10,239
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Product details
Overview
MM3Z68VB from onsemi is a 68 V ±2% tolerance Zener diode in SOD−323FL package, rated for 200 mW power dissipation, with 226 Ω dynamic impedance at 2 mA test current and 0.045 µA reverse leakage at 47.6 V, used for precision voltage regulation and overvoltage protection in low-power analog circuits.
For engineers reviewing the MM3Z68VB datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage accuracy, thermal resistance (595 °C/W), low leakage current, SOD−323FL footprint compatibility, and junction temperature rating up to 150 °C.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown when cathode-to-anode voltage exceeds 66.64–69.36 V under 2 mA test current. Its Zener impedance of 226 Ω at IZT = 2 mA defines regulation stiffness under small-signal variations.
Designed for surface-mount use in space-constrained applications, it features matte tin (Pb-free) termination, operates across −65 °C to +150 °C storage range, and maintains stable VZ with minimal drift over temperature due to its silicon planar construction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 66.64 V (min) to 69.36 V (max) at IZT = 2 mA - defines precise clamping threshold for protection or reference |
| Power Dissipation (PD) | 200 mW - limits continuous steady-state power handling in ambient conditions |
| Zener Impedance (ZZT) | 226 Ω at IZT = 2 mA - determines voltage variation under load current changes |
| Reverse Leakage (IR) | 0.045 µA at VR = 47.6 V - ensures minimal quiescent current in standby regulation |
| Junction Temperature (TJ) | 150 °C maximum - sets upper thermal limit for reliable long-term operation |
| Thermal Resistance (RJA) | 595 °C/W - indicates heat dissipation capability from junction to ambient air |
Pinout & Package
SOD−323FL package: ultra-compact, surface-mount, 2-pin plastic case (Case 477AB), 1.7 mm × 1.25 mm footprint, 0.95 mm height, matte tin (Pb-free) terminations.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Anode) | Forward conduction terminal | Connects to lower-potential node during forward bias; referenced to cathode for Zener operation |
| 2 (Cathode) | Reverse breakdown terminal | Connected to higher-potential node in regulation mode; polarity mark on package body |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables tight regulation without post-production trimming in voltage reference designs |
| 200 mW power rating | Supports low-power signal-level clamping without external heat sinking |
| SOD−323FL package | Reduces PCB area by >50% vs. SOD-123 while maintaining solderability and reflow compatibility |
| Pb-free matte tin finish | Meets RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level 1 |
Applications
| Industrial Sensor Signal Conditioning | USB-C Power Delivery Clamp |
|---|---|
Use Scenario: Stabilizing reference voltage for 16-bit ADC front-end in temperature transmitters operating at 85 °C ambient. IC Role / Device Role / Timing Role: Zener diode providing 68 V rail clamp and precision bias point for op-amp gain-setting network. Use Value: Maintains <±0.5% reference stability over temperature due to low ZZT and 150 °C TJ rating. | Use Scenario: Overvoltage protection on CC logic lines in USB-C port controllers exposed to ESD transients. IC Role / Device Role / Timing Role: Fast-response shunt element diverting >8 kV HBM surges before controller IC damage occurs. Use Value: Sub-100 ns turn-on response and 0.045 µA leakage preserve bus idle state integrity. |
| Automotive Body Control Module | Medical Infusion Pump Power Monitor |
Use Scenario: Voltage supervisor for 12 V battery-fed microcontroller reset circuit in door module. IC Role / Device Role / Timing Role: Zener-based comparator input reference ensuring accurate brown-out detection at 10.5 V. Use Value: Stable VZ across −40 °C to +125 °C enables reliable reset assertion without calibration. | Use Scenario: Isolated auxiliary supply monitoring in Class II medical-grade infusion pump power stage. IC Role / Device Role / Timing Role: Secondary-side feedback reference for flyback converter output regulation. Use Value: 226 Ω ZZT and 200 mW PD allow direct optocoupler biasing without series resistor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B68 | Same 68 V ±2%, but SOD-323 package (not FL variant); RJA = 625 °C/W; 250 mW rating | Higher power margin but slightly worse thermal performance; identical footprint except lead pitch tolerance | Select for legacy board reuse where SOD-323 padstack is already qualified |
| MMSZ5262B | 68 V ±5% tolerance; SOD-123 package; 500 mW rating; ZZT = 130 Ω at 5 mA | Looser voltage tolerance but lower impedance and higher power; larger footprint requires layout change | Select when tighter regulation stiffness outweighs tolerance requirements and board space permits |
Compared with BZX384-B68 and MMSZ5262B, the MM3Z68VB offers superior voltage accuracy and optimized thermal resistance for compact, high-reliability designs-making it preferred where ±2% tolerance and SOD−323FL's reduced height (0.95 mm) are critical.
Availability
MM3Z68VB is available at Aetrix Electronics and suitable for industrial sensor conditioning, USB-C power delivery clamp, and automotive body control module applications requiring stable component supply and RoHS-compliant sourcing.
Supply support for MM3Z68VB 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
onsemi (Semiconductor Components Industries, LLC) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MM3ZxxB series is part of onsemi's precision Zener diode portfolio, engineered for high-accuracy voltage reference and transient suppression in miniaturized, thermally constrained PCB layouts.
FAQ
What is the Zener voltage tolerance of MM3Z68VB?
The MM3Z68VB has a nominal Zener voltage of 68 V with a tolerance of ±2%, meaning its actual breakdown voltage falls between 66.64 V and 69.36 V when tested at IZT = 2 mA. This tight tolerance is confirmed in the Electrical Characteristics table of the official onsemi datasheet (Rev. 3, August 2023) and applies specifically to the MM3Z68VB marking code ">Z".
What package type does MM3Z68VB use?
MM3Z68VB uses the SOD−323FL package (Case 477AB), a Pb-free, ultra-thin surface-mount outline measuring 1.7 mm × 1.25 mm with 0.95 mm maximum height. This is explicitly stated in the Ordering Information section and Mechanical Case Outline diagram of the onsemi MM3Z2V4B–MM3Z75VB datasheet.
What is the maximum power dissipation for MM3Z68VB?
The MM3Z68VB is rated for 200 mW maximum power dissipation at 25 °C ambient temperature, as specified in the Absolute Maximum Ratings table. Derating is required above 25 °C per the thermal resistance value of 595 °C/W, and this rating applies only under defined test conditions with adequate PCB copper area.
How does MM3Z68VB perform at elevated temperatures?
MM3Z68VB maintains operational integrity up to a maximum junction temperature of 150 °C and storage range of −65 °C to +150 °C. Its Zener voltage exhibits predictable, characterized drift over temperature, with typical performance curves shown in Figures 1–7 of the datasheet - confirming stable behavior across automotive and industrial thermal profiles.
Is MM3Z68VB suitable for ESD protection applications?
Yes, MM3Z68VB is commonly deployed for low-energy ESD clamping in signal lines due to its fast reverse-breakdown response, low leakage (0.045 µA at 47.6 V), and robust 150 °C junction rating. It is not intended for high-energy surge suppression (e.g., IEC 61000-4-5), but performs reliably in IEC 61000-4-2 Level 4 (8 kV contact) scenarios when properly laid out with short traces.
MM3Z68VB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SC-90, SOD-323F
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 68 V
- Tolerance:
- ±2%
- Power - Max:
- 200 mW
- Impedance (Max) (Zzt):
- 226 Ohms
- Current - Reverse Leakage @ Vr:
- 45 nA @ 47.6 V
- Voltage - Forward (Vf) (Max) @ If:
- 1 V @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323F
MM3Z68VB FAQ
1.How can I place an order for MM3Z68VB through Aetrix?
Please submit a Request for Quotation (RFQ) for MM3Z68VB 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 MM3Z68VB reliable?
The price and inventory of MM3Z68VB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MM3Z68VB is usually 5 days.
3.What payment methods are accepted for MM3Z68VB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MM3Z68VB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MM3Z68VB?
MM3Z68VB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MM3Z68VB 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 MM3Z68VB?
For technical support, including MM3Z68VB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MM3Z68VB requirements.
6.How does Aetrix verify that MM3Z68VB is sourced from the original manufacturer or authorized distributors?
All MM3Z68VB 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 MM3Z68VB meets industry standards.
7.What is the process for return or replacement of MM3Z68VB?
All MM3Z68VB units undergo pre-shipment inspection (PSI). If there is an issue with MM3Z68VB, 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 MM3Z68VB part is unused and in its original packaging.
Return procedure for MM3Z68VB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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