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onsemi MM3Z51VT1G
- Part No.:
- MM3Z51VT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
MM3Z51VT1G.pdf
- Description:
- DIODE ZENER 51V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:5,379
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Product details
Overview
MM3Z51VT1G from onsemi is a 51 V, 300 mW Zener voltage regulator diode in SOD−323 package, with nominal Zener voltage 51 V (48–54 V range), dynamic impedance 180 Ω at 2 mA test current, and leakage current ≤0.05 µA at 35.7 V reverse voltage. It provides precision voltage clamping for overvoltage protection in space-constrained portable electronics.
For engineers reviewing the MM3Z51VT1G datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal derating behavior, ESD robustness (Class 3, >16 kV HBM), and direct alternative options for voltage reference and transient suppression use cases.
Technical Context
This device operates as a two-terminal, silicon planar Zener diode optimized for stable reverse-bias regulation. Its 51 V nominal breakdown voltage is specified at IZT = 2 mA, with temperature coefficient +0.05 mV/°C and maximum Zener impedance of 180 Ω at that condition.
It features low capacitance (40 pF at 0 V, 1 MHz), ultra-low leakage (≤0.05 µA at VR = 35.7 V), and AEC−Q101 qualification when ordered as SZMM3Z51VT1G. Thermal resistance RJA is 416 °C/W on FR−4 board, supporting operation from −65 °C to +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 48–54 V range at IZT = 2 mA - defines clamping threshold for overvoltage protection circuits |
| Power Dissipation (PD) | 300 mW at TA = 25°C - sets maximum continuous power handling on standard PCB |
| Zener Impedance (ZZT) | 180 Ω max at IZT = 2 mA - determines regulation stiffness under varying load current |
| Leakage Current (IR) | ≤0.05 µA at VR = 35.7 V - ensures minimal standby current in high-impedance bias networks |
| Capacitance (C) | 40 pF at VR = 0 V, f = 1 MHz - impacts high-frequency noise filtering and signal integrity in RF-adjacent layouts |
| ESD Rating | Class 3 (>16 kV) per HBM - enables direct integration into handheld device front-end protection without additional ESD staging |
| Package | SOD−323 (Case 477) - 1.7 mm × 1.25 mm × 0.9 mm footprint ideal for dense mobile PCBs |
Pinout & Package
SOD−323 surface-mount package with cathode indicated by polarity band; total body dimensions 1.7 mm × 1.25 mm × 0.9 mm; mounting position unrestricted.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Zener anode connection point in reverse-bias configuration | Connected to higher-potential rail during regulation; polarity band identifies this terminal |
| 2 (Anode) | Zener cathode connection point in reverse-bias configuration | Typically tied to ground or reference node; completes Zener conduction path when Vin exceeds VZ |
Key Features
| Feature | Design Value |
|---|---|
| Pb−Free construction | Complies with RoHS Directive 2011/65/EU and JEDEC J-STD-020 reflow profile requirements |
| Low-profile SOD−323 package | 0.9 mm height enables stacking under shields or placement beneath connectors in slim devices |
| High ESD immunity | Class 3 HBM rating (>16 kV) eliminates need for external ESD diodes in many consumer interface lines |
| Stable temperature coefficient | +0.05 mV/°C enables predictable drift compensation in battery-powered voltage references |
| AEC−Q101 qualified variant | SZMM3Z51VT1G version supports automotive infotainment and body control module designs |
Applications
| Portable Power Rail Clamping | USB Interface Overvoltage Protection |
|---|---|
|
Use Scenario: Protecting 5 V USB VBUS line against hot-swap transients and adapter surges in smartphones and tablets. IC Role / Device Role / Timing Role: Standalone shunt regulator clamping excess voltage before it reaches USB controller ICs. Use Value: 51 V rating provides 10× margin above 5 V rail while maintaining <40 pF capacitance to avoid signal integrity degradation. |
Use Scenario: Safeguarding USB data lines (D+/D−) from ESD events during cable insertion in portable accessories. IC Role / Device Role / Timing Role: Low-capacitance Zener used in conjunction with series resistors to clamp fast ESD pulses without distorting 480 Mbps signaling. Use Value: 40 pF capacitance and Class 3 HBM rating allow direct placement adjacent to USB connectors without bandwidth loss. |
| Reference Voltage Source | High-Density PC Board Protection |
|
Use Scenario: Generating stable 51 V reference for analog-to-digital converter biasing in industrial sensor signal chains. IC Role / Device Role / Timing Role: Precision Zener providing fixed reverse-bias voltage to op-amp feedback networks. Use Value: Tight 48–54 V tolerance and +0.05 mV/°C TC enable ±0.5% reference stability across −40 °C to +85 °C ambient. |
Use Scenario: Implementing compact overvoltage protection on multi-layer server motherboard power delivery networks. IC Role / Device Role / Timing Role: Space-efficient shunt element placed near VRM outputs to absorb minor rail excursions. Use Value: 1.7 mm × 1.25 mm SOD−323 footprint fits between BGA pads without requiring redesign of inner layers. |
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 (Nexperia) | Same 51 V nominal Zener, 300 mW rating, SOD−323 package, but 200 Ω ZZT @ 5 mA vs. MM3Z51VT1G's 180 Ω @ 2 mA | Higher test current shifts operating point; less suitable for ultra-low-current bias networks | Select when design uses ≥5 mA Zener bias and requires Nexperia's extended automotive qualification coverage |
| MMSZ5255B-TP (Micro Commercial Components) | 51 V nominal, 500 mW rating, SOD−123 package (2.7 mm × 1.6 mm), 150 Ω ZZT @ 20 mA | Larger footprint and higher power dissipation require layout revision; better for higher-current clamping | Choose when thermal margin is critical and PCB area allows SOD−123; not drop-in compatible due to size and pin spacing |
Compared with BZX384-B51,115 and MMSZ5255B-TP, MM3Z51VT1G offers tighter low-current regulation (180 Ω @ 2 mA), smallest PCB footprint (1.7 × 1.25 mm), and best ESD robustness (Class 3), making it optimal for miniaturized, low-power, high-reliability portable designs.
Availability
MM3Z51VT1G is available at Aetrix Electronics and suitable for portable power rail clamping, USB interface overvoltage protection, and high-density PC board protection requiring stable component supply, consistent lead-free compliance, and traceable lot-level documentation.
Supply support for MM3Z51VT1G 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 supplier specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The MM3ZxxxT1G series was developed specifically for space-constrained voltage regulation and ESD-tolerant clamping in portable electronics, emphasizing ultra-small footprint, high reliability, and Pb−free manufacturability.
FAQ
What is the Zener voltage tolerance of MM3Z51VT1G?
The MM3Z51VT1G has a guaranteed Zener voltage range of 48 V to 54 V at test current IZT = 2 mA and TA = 25°C. This ±6% tolerance reflects manufacturing spread and is documented in the Electrical Characteristics table on page 2 of the official datasheet. The nominal value is 51 V, and the device maintains this specification across its full operating temperature range.
Does MM3Z51VT1G support automotive applications?
Yes - the SZMM3Z51VT1G variant is AEC−Q101 qualified and PPAP capable, meeting automotive reliability standards for passive components. The standard MM3Z51VT1G is not automotive-qualified; only the SZ-prefix version carries that certification. Both share identical electrical specs and SOD−323 packaging, but automotive use requires explicit ordering of the SZMM3Z51VT1G part number.
What is the maximum junction temperature for MM3Z51VT1G?
The MM3Z51VT1G has a junction and storage temperature range of −65 °C to +150 °C. Its thermal resistance RJA is 416 °C/W on FR−4 board (1 cm² copper pad), meaning at 300 mW dissipation and 25 °C ambient, junction temperature rises to approximately 151 °C - slightly exceeding absolute max. Derating is required above 25 °C at 2.4 mW/°C to stay within safe limits.
How does the ESD rating of MM3Z51VT1G compare to typical consumer-grade Zeners?
MM3Z51VT1G achieves Class 3 Human Body Model (HBM) ESD rating (>16 kV), significantly exceeding the Class 2 (≥4 kV) or unqualified ratings common in generic Zener diodes. This high immunity stems from onsemi's process optimization and is validated per ANSI/ESDA/JEDEC JS-001, enabling direct placement on exposed I/O lines without supplemental ESD protection in handheld devices.
Can MM3Z51VT1G be used as a voltage reference in precision analog circuits?
MM3Z51VT1G can serve as a moderate-precision voltage reference where ±6% initial tolerance and +0.05 mV/°C temperature coefficient are acceptable - e.g., non-critical biasing or coarse threshold detection. For high-accuracy references, dedicated shunt references like TL431 or bandgap-based ICs offer superior stability, lower noise, and tighter TC. MM3Z51VT1G's 40 pF capacitance also limits high-frequency reference use.
MM3Z51VT1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- 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
MM3Z51VT1G FAQ
1.How can I place an order for MM3Z51VT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for MM3Z51VT1G 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 MM3Z51VT1G reliable?
The price and inventory of MM3Z51VT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MM3Z51VT1G is usually 5 days.
3.What payment methods are accepted for MM3Z51VT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MM3Z51VT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MM3Z51VT1G?
MM3Z51VT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MM3Z51VT1G 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 MM3Z51VT1G?
For technical support, including MM3Z51VT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MM3Z51VT1G requirements.
6.How does Aetrix verify that MM3Z51VT1G is sourced from the original manufacturer or authorized distributors?
All MM3Z51VT1G 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 MM3Z51VT1G meets industry standards.
7.What is the process for return or replacement of MM3Z51VT1G?
All MM3Z51VT1G units undergo pre-shipment inspection (PSI). If there is an issue with MM3Z51VT1G, 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 MM3Z51VT1G part is unused and in its original packaging.
Return procedure for MM3Z51VT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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