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onsemi MM3Z51VB
- Part No.:
- MM3Z51VB
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SC-90, SOD-323F
- Datasheet:
-
MM3Z51VB.pdf
- Description:
- DIODE ZENER 51V 200MW SOD323F
- Quantity:
- Payment:
- Shipping:
Inventory:20,640
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Product details
Overview
MM3Z51VB from onsemi is a ±2% tolerance Zener diode in SOD−323FL package, rated for 51 V nominal Zener voltage at 5 mA test current, 169 Ω dynamic impedance, and 200 mW power dissipation. It provides precision voltage regulation in low-power analog reference and overvoltage protection circuits.
For engineers reviewing the MM3Z51VB datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage accuracy, thermal resistance (595 °C/W), leakage current (≤45 nA at 35.7 V), forward voltage (≤1.0 V at 10 mA), and SOD−323FL footprint compatibility.
Technical Context
This device operates as a two-terminal voltage reference with stable reverse breakdown behavior across −65 °C to +150 °C storage range and 150 °C maximum junction temperature. Its 51 V Zener voltage is specified under 10 ms pulse conditions with ±2% tolerance and validated at IZT = 5 mA.
The MM3Z51VB exhibits 169 Ω Zener impedance at IZT and 376 Ω at IZK = 2 mA, with reverse leakage ≤45 nA at VR = 35.7 V. Thermal resistance of 595 °C/W reflects its SOD−323FL package's limited heat dissipation capability in ambient-air convection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 49.98 V (min) to 52.02 V (max) at IZT = 5 mA - defines tight regulation window for reference stability |
| Zener Impedance (ZZT) | 169 Ω at IZT = 5 mA - indicates moderate AC impedance affecting regulation ripple rejection |
| Power Dissipation (PD) | 200 mW - limits continuous DC current to ~3.9 mA at 51 V without derating |
| Reverse Leakage (IR) | ≤45 nA at VR = 35.7 V - ensures minimal standby current in high-impedance bias networks |
| Forward Voltage (VF) | ≤1.0 V at IF = 10 mA - supports use as clamp or level-shifter in forward conduction mode |
| Thermal Resistance (RJA) | 595 °C/W - requires careful PCB copper area planning for sustained power operation |
Pinout & Package
SOD−323FL surface-mount package (Case 477AB), 1.7 mm × 1.25 mm × 0.95 mm, matte tin finish, Pb-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Anode) | Forward conduction terminal / low-side connection | Connected to ground or lower potential in shunt regulator configuration |
| 2 (Cathode) | Zener breakdown terminal / high-side connection | Connected to input rail via series resistor; regulates voltage at cathode node |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables direct replacement in precision 51 V reference designs without recalibration |
| SOD−323FL ultra-small footprint | Supports high-density PCB layouts in space-constrained portable and IoT devices |
| 150 °C maximum junction temperature | Permits operation in automotive under-hood and industrial control environments |
| Matte tin (Sn) Pb-free finish | Ensures RoHS compliance and solderability with standard reflow profiles |
Applications
| Industrial Sensor Reference | USB-C Overvoltage Clamp |
|---|---|
Use Scenario: Provides stable 51 V reference for 24-bit ADC biasing in programmable logic controller analog input modules. IC Role / Device Role / Timing Role: Shunt voltage reference establishing precise full-scale calibration point. Use Value: ±2% VZ tolerance and low 45 nA leakage maintain <0.005% gain error over temperature. |
Use Scenario: Clamps transient surges above 35.7 V on USB-C VBUS lines during hot-plug events. IC Role / Device Role / Timing Role: Fast-acting overvoltage protector placed between VBUS and ground. Use Value: 200 mW rating and 169 Ω ZZT allow safe energy absorption without thermal runaway. |
| Medical Instrument Power Monitor | Telecom Line Card Supervisor |
Use Scenario: Monitors 48 V DC power rail integrity in portable ultrasound battery packs. IC Role / Device Role / Timing Role: Undervoltage/overvoltage detection element feeding comparator input. Use Value: Tight 49.98–52.02 V window enables accurate fault threshold setting at ±0.5 V. |
Use Scenario: Supplies regulated bias to supervisory ICs monitoring -48 V telecom line cards. IC Role / Device Role / Timing Role: Low-power Zener shunt regulator generating local 51 V reference. Use Value: 595 °C/W RJA and SOD−323FL package enable integration near ASICs without heatsinking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX55C51 (Vishay) | 5% tolerance, DO-35 through-hole package, 500 mW rating | Requires PCB layout change; suited for higher-power, non-space-constrained designs | Select when board-level reliability testing mandates legacy DO-35 mechanical robustness |
| MMSZ5255B (ON Semiconductor) | Same ±2% tolerance, SOD-123 package, 500 mW rating, 51 V nominal | Larger footprint but higher power handling; compatible with existing SOD-123 footprints | Choose for designs needing >200 mW dissipation without redesigning land pattern |
Compared with BZX55C51 and MMSZ5255B, the MM3Z51VB offers the smallest footprint and lowest thermal resistance among ±2% 51 V Zeners, making it optimal for miniaturized, thermally sensitive applications where 200 mW suffices.
Availability
MM3Z51VB is available at Aetrix Electronics and suitable for industrial sensor reference, USB-C overvoltage clamp, medical instrument power monitor, and telecom line card supervisor applications requiring stable component supply and RoHS-compliant sourcing.
Supply support for MM3Z51VB 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 MM3Z51VB belongs to onsemi's MM3Z series of precision Zener diodes designed specifically for compact, high-reliability voltage regulation in space- and power-constrained SMD systems.
FAQ
What is the Zener voltage tolerance of the MM3Z51VB?
The MM3Z51VB has a ±2% Zener voltage tolerance, meaning its nominal 51 V breakdown occurs between 49.98 V and 52.02 V at the specified test current of 5 mA. This tight tolerance makes the MM3Z51VB suitable for precision reference applications where calibration stability is critical. The tolerance is confirmed in the Electrical Characteristics table of the official onsemi datasheet Rev. 3 (August 2023).
What package type does the MM3Z51VB use?
The MM3Z51VB uses the SOD−323FL surface-mount package (Case 477AB), measuring 1.7 mm × 1.25 mm × 0.95 mm with matte tin (Sn) Pb-free finish. This ultra-compact package is explicitly listed in the Ordering Information section of the onsemi datasheet and supports high-density PCB assembly. The connection diagram confirms pin 1 as anode and pin 2 as cathode.
What is the maximum power dissipation rating for the MM3Z51VB?
The MM3Z51VB has a maximum power dissipation (PD) of 200 mW at TA = 25 °C, as stated in the Absolute Maximum Ratings table. Due to its 595 °C/W junction-to-ambient thermal resistance, this rating must be derated linearly above 25 °C ambient - for example, to ~140 mW at 70 °C. This limit directly constrains usable Zener current in continuous operation.
How does the MM3Z51VB perform in terms of reverse leakage current?
The MM3Z51VB specifies a maximum reverse leakage current (IR) of 45 nA at VR = 35.7 V, per the Electrical Characteristics table. This ultra-low leakage supports high-impedance bias networks and precision reference dividers where parasitic current paths could degrade accuracy. The value is measured under standardized test conditions and verified across production lots.
Is the MM3Z51VB suitable for automotive applications?
Yes, the MM3Z51VB is suitable for automotive applications due to its −65 °C to +150 °C storage temperature range and 150 °C maximum junction temperature rating. While not AEC-Q200 qualified out-of-box, its thermal and electrical specifications align with under-dash and infotainment subsystem requirements. Designers should verify system-level qualification per their specific automotive program requirements.
MM3Z51VB 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):
- 51 V
- Tolerance:
- ±2%
- Power - Max:
- 200 mW
- Impedance (Max) (Zzt):
- 169 Ohms
- Current - Reverse Leakage @ Vr:
- 45 nA @ 35.7 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
MM3Z51VB FAQ
1.How can I place an order for MM3Z51VB through Aetrix?
Please submit a Request for Quotation (RFQ) for MM3Z51VB 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 MM3Z51VB reliable?
The price and inventory of MM3Z51VB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MM3Z51VB is usually 5 days.
3.What payment methods are accepted for MM3Z51VB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MM3Z51VB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MM3Z51VB?
MM3Z51VB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MM3Z51VB 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 MM3Z51VB?
For technical support, including MM3Z51VB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MM3Z51VB requirements.
6.How does Aetrix verify that MM3Z51VB is sourced from the original manufacturer or authorized distributors?
All MM3Z51VB 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 MM3Z51VB meets industry standards.
7.What is the process for return or replacement of MM3Z51VB?
All MM3Z51VB units undergo pre-shipment inspection (PSI). If there is an issue with MM3Z51VB, 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 MM3Z51VB part is unused and in its original packaging.
Return procedure for MM3Z51VB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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