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onsemi MM3Z51VT1
- Part No.:
- MM3Z51VT1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
MM3Z51VT1.pdf
- Description:
- DIODE ZENER 51V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:15,000
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Product details
Overview
MM3Z51VT1 from onsemi is a 51 V, 200 mW surface-mount Zener diode in SOD−323 package, with nominal Zener voltage 51 V (min 48 V, max 54 V) at 2 mA test current, dynamic impedance 180 Ω at IZT, and leakage current ≤0.05 µA at 35.7 V reverse voltage. It provides precision voltage regulation for low-power biasing and overvoltage protection in space-constrained portable electronics.
For engineers reviewing the MM3Z51VT1 datasheet, pinout, applications, or equivalent options, key selection criteria include its 51 V regulation tolerance, 180 Ω Zener impedance at 2 mA, −2.7 mV/°C temperature coefficient, 40 pF capacitance at 0 V, and Pb-free SOD−323 footprint compatibility with high-density PCB layouts.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable reference voltage under varying load and temperature conditions. Its 200 mW power rating and 635 °C/W junction-to-ambient thermal resistance define safe operating limits on FR-4 boards at TA = 25°C, with linear derating above that temperature.
The device exhibits a negative temperature coefficient of −2.7 mV/°C, indicating decreasing Zener voltage with rising junction temperature. Its low 40 pF capacitance at 0 V and 1 MHz supports high-frequency noise suppression without signal distortion in analog sensing paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 48–54 V at 2 mA test current - defines regulation window for precision reference or clamp threshold |
| Zener Impedance (ZZT) | 180 Ω at IZT = 2 mA - determines output voltage stability under load variation |
| Leakage Current (IR) | ≤0.05 µA at VR = 35.7 V - ensures minimal standby power loss in battery-powered circuits |
| Temperature Coefficient | −2.7 mV/°C - quantifies voltage drift across operating temperature range (−65 to +150 °C) |
| Capacitance (C) | 40 pF at VR = 0 V, f = 1 MHz - enables effective RF bypass without loading high-impedance nodes |
| ESD Rating | Class 3 (>16 kV) HBM - supports robust handling in automated assembly and field environments |
| Package | SOD−323 (Case 477) - 1.7 mm × 1.25 mm × 0.9 mm footprint ideal for ultra-dense portable PCBs |
Pinout & Package
SOD−323 package with cathode marked by polarity band; body dimensions 1.7 mm × 1.25 mm × 0.9 mm; mounting position unrestricted; Pb-free plating available.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Zener breakdown terminal | Connected to regulated voltage node; polarity band identifies this terminal for correct orientation during placement |
| 2 (Anode) | Reference ground return | Typically tied to system ground or lower-potential rail; completes reverse-bias path for regulation |
Key Features
| Feature | Design Value |
|---|---|
| Steady-state power rating | 200 mW on FR-4 board - supports continuous operation in low-power sensor bias and reference applications |
| ESD robustness | Class 3 (>16 kV) per HBM - eliminates need for external ESD protection in handheld interface circuits |
| Pb-free compliance | RoHS-compliant Sn-only or Pb-Sn plating - meets global environmental regulations without solderability compromise |
| Low-profile packaging | 0.9 mm height - enables stacking under shields or integration into slim form-factor devices like wearables |
| Wide operating temperature | −65 °C to +150 °C junction range - suitable for automotive under-hood and industrial control environments |
Applications
| Portable Power Management | Automotive Sensor Biasing |
|---|---|
|
Use Scenario: Voltage reference for Li-ion battery fuel gauges and charger ICs in smartphones and tablets. IC Role / Device Role / Timing Role: Zener regulator providing stable 51 V reference for ADC input scaling and overvoltage detection circuitry. Use Value: Tight 48–54 V tolerance and low 0.05 µA leakage ensure accurate state-of-charge reporting over full battery discharge cycle. |
Use Scenario: Precision bias supply for pressure and temperature sensors in engine control units. IC Role / Device Role / Timing Role: Reverse-biased Zener supplying regulated excitation voltage to bridge-based transducers. Use Value: −2.7 mV/°C tempco and 180 Ω impedance minimize sensor offset drift across −40 to +125 °C ambient range. |
| Industrial IoT Node Protection | Medical Wearable Reference |
|
Use Scenario: Overvoltage clamp on RS-485 data lines exposed to ESD and surge events. IC Role / Device Role / Timing Role: Transient voltage suppressor limiting line voltage to 54 V peak during fast transients. Use Value: 16 kV HBM ESD rating and 40 pF capacitance prevent data corruption while maintaining signal integrity up to 10 Mbps. |
Use Scenario: Low-noise voltage reference for ECG front-end amplifiers in patch-style monitors. IC Role / Device Role / Timing Role: Stable DC reference source for op-amp gain-setting and ADC reference buffers. Use Value: Ultra-low 0.05 µA leakage avoids loading high-impedance biopotential electrodes and preserves signal SNR. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B51,115 | 51 V ±5% (48.5–53.6 V), 300 mW, SOD-323, 100 Ω ZZT @ 5 mA | Higher power rating but higher test current; tighter voltage tolerance but different impedance profile | Select when higher surge energy handling is required and 5 mA bias is acceptable |
| MMSZ5256ET1G | 51 V ±5% (48.5–53.6 V), 500 mW, SOD-123, 150 Ω ZZT @ 20 mA | Larger SOD-123 package (3.5 mm × 1.6 mm); requires higher bias current for specified ZZT | Choose for legacy board compatibility where SOD-123 footprint exists and higher power margin is needed |
Compared with BZX384-B51,115 and MMSZ5256ET1G, the MM3Z51VT1 offers the smallest footprint (SOD−323), lowest leakage (0.05 µA), and optimal 2 mA test condition for ultra-low-power designs-making it preferred for miniaturized battery-operated systems despite its 200 mW limit.
Availability
MM3Z51VT1 is available at Aetrix Electronics and suitable for portable power management, automotive sensor biasing, industrial IoT node protection, and medical wearable reference applications requiring stable component supply and RoHS-compliant sourcing.
Supply support for MM3Z51VT1 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 (formerly ON Semiconductor) is a global semiconductor manufacturer specializing in energy-efficient power and signal management solutions for automotive, industrial, cloud, and consumer markets.
The MM3Z51VT1 belongs to the MM3ZxxxT1 series of 200 mW Zener regulators designed specifically for space-constrained, low-power voltage reference and overvoltage protection in portable and high-density electronic systems.
FAQ
What is the Zener voltage tolerance of MM3Z51VT1?
The MM3Z51VT1 has a nominal Zener voltage of 51 V with a guaranteed tolerance range of 48 V to 54 V at 2 mA test current, as specified in the Electrical Characteristics table of the official onsemi datasheet. This ±3 V window reflects manufacturing process control and ensures predictable clamping behavior in protection circuits using the MM3Z51VT1.
Does MM3Z51VT1 support Pb-free soldering processes?
Yes, the MM3Z51VT1 is offered in a Pb-free version (denoted by the "G" suffix), with Sn-only plating compatible with standard reflow profiles up to 260°C for 10 seconds. The device meets JEDEC J-STD-020 moisture sensitivity level 1 and is qualified for lead-free assembly without reliability degradation - a key requirement for modern production using the MM3Z51VT1.
What is the maximum reverse leakage current for MM3Z51VT1?
The MM3Z51VT1 specifies a maximum reverse leakage current of 0.05 µA at a reverse voltage of 35.7 V (70% of nominal VZ). This ultra-low leakage is critical for battery-powered applications where standby current must be minimized - confirming that the MM3Z51VT1 delivers exceptional off-state performance in always-on circuits.
Can MM3Z51VT1 be used in automotive-grade designs?
Yes, the MM3Z51VT1 is rated for junction temperatures from −65°C to +150°C and qualified to AEC-Q200 stress test standards for passive components. Its robust construction, 16 kV HBM ESD rating, and stable −2.7 mV/°C temperature coefficient make it suitable for non-safety-critical automotive sensor biasing and power rail monitoring applications using the MM3Z51VT1.
How does the Zener impedance of MM3Z51VT1 affect regulation accuracy?
The MM3Z51VT1 exhibits 180 Ω dynamic impedance at 2 mA test current, meaning a 1 mA change in Zener current causes approximately 180 mV shift in output voltage. This value directly impacts regulation accuracy under varying load conditions - designers using the MM3Z51VT1 must account for this impedance when sizing series resistors and defining acceptable voltage deviation in their reference or clamp circuits.
MM3Z51VT1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 51 V
- Tolerance:
- ±6%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 180 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 35.7 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-323
MM3Z51VT1 FAQ
1.How can I place an order for MM3Z51VT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MM3Z51VT1 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 MM3Z51VT1 reliable?
The price and inventory of MM3Z51VT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MM3Z51VT1 is usually 5 days.
3.What payment methods are accepted for MM3Z51VT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MM3Z51VT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MM3Z51VT1?
MM3Z51VT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MM3Z51VT1 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 MM3Z51VT1?
For technical support, including MM3Z51VT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MM3Z51VT1 requirements.
6.How does Aetrix verify that MM3Z51VT1 is sourced from the original manufacturer or authorized distributors?
All MM3Z51VT1 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 MM3Z51VT1 meets industry standards.
7.What is the process for return or replacement of MM3Z51VT1?
All MM3Z51VT1 units undergo pre-shipment inspection (PSI). If there is an issue with MM3Z51VT1, 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 MM3Z51VT1 part is unused and in its original packaging.
Return procedure for MM3Z51VT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MM3Z51VT1 Tags
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