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onsemi MM3Z68VT1
- Part No.:
- MM3Z68VT1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
MM3Z68VT1.pdf
- Description:
- DIODE ZENER 68V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:18,000
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Product details
Overview
MM3Z68VT1 from onsemi is a 68 V ±5% Zener voltage regulator diode in SOD−323 package, rated for 200 mW steady-state power dissipation at 25°C, with 240 Ω maximum Zener impedance at 2 mA test current and 0.05 µA reverse leakage at 47.6 V. It provides precision voltage clamping in space-constrained portable electronics.
For engineers reviewing the MM3Z68VT1 datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage tolerance (±5%), low-profile SOD−323 footprint (1.7 mm × 1.25 mm), ESD robustness (>16 kV HBM), thermal resistance (635 °C/W), and Pb-free compliance per device marking "G" suffix.
Technical Context
The MM3Z68VT1 operates as a two-terminal voltage reference device, conducting in reverse breakdown to maintain stable voltage across its terminals under varying load and temperature conditions. Its Zener voltage is specified at 2 mA (IZT = 2 mA), with dynamic impedance measured at 1 kHz AC superimposed on DC bias.
It exhibits a positive temperature coefficient of +1.2 mV/°C near 68 V, enabling predictable drift compensation in temperature-sensitive circuits. The device is optimized for low-capacitance operation (35 pF at 0 V, 1 MHz) and features cathode polarity indicated by a band on the SOD−323 body.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 64 V min / 68 V nom / 72 V max @ IZT = 2 mA - defines clamping threshold with ±5% tolerance at standard test condition |
| Power Dissipation (PD) | 200 mW @ TA = 25°C - limits continuous thermal stress on FR-5 PCB; derates 1.5 mW/°C above ambient |
| Zener Impedance (ZZT) | 240 Ω max @ IZT = 2 mA - determines regulation stiffness and output voltage variation under load transients |
| Reverse Leakage (IR) | 0.05 µA max @ VR = 47.6 V - ensures minimal standby current in high-impedance bias networks |
| Capacitance (C) | 35 pF @ VR = 0 V, f = 1 MHz - supports RF filtering and high-speed signal integrity in ESD protection paths |
| ESD Rating | Class 3 (>16 kV) per HBM - qualifies for direct interface with user-accessible ports in handheld devices |
| Package | SOD−323 (Case 477) - 1.7 mm × 1.25 mm × 0.9 mm footprint enables high-density layout on compact PCBs |
Pinout & Package
SOD−323 surface-mount package with molded plastic case (UL 94 V−0), cathode marked by band; mounting position unrestricted; lead finish Pb−Sn or Sn-only (Pb−free).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Reverse-biased terminal | Connected to regulated voltage node; carries reverse current during Zener conduction |
| 2 (Anode) | Reference/ground terminal | Biased at lower potential; forms return path for Zener current and sets clamping reference point |
Key Features
| Feature | Design Value |
|---|---|
| Precision Zener voltage tolerance | ±5% (64–72 V range) enables accurate overvoltage protection without external trimming |
| Low-profile SOD−323 footprint | 1.7 mm × 1.25 mm × 0.9 mm height allows placement in tight spaces such as smartphone camera modules |
| High ESD immunity | Class 3 (>16 kV HBM) supports direct integration into USB, SIM, and SD card interfaces without added TVS |
| Pb-free compliant construction | "G" suffix confirms RoHS-compliant Sn-only plating and UL 94 V−0 flammability rating |
| Stable temperature coefficient | +1.2 mV/°C near 68 V enables predictable drift behavior in automotive cabin temperature ranges |
Applications
| Cellular Phone Power Rails | USB Interface Protection |
|---|---|
Use Scenario: Clamping transient surges on 5 V USB VBUS line during hot-plug events and ESD discharge. IC Role / Device Role / Timing Role: Zener diode acting as shunt overvoltage protector between VBUS and ground. Use Value: 35 pF capacitance minimizes signal distortion; 0.05 µA leakage avoids loading idle bus states. | Use Scenario: Protecting microcontroller I/O pins connected to external peripherals against induced transients. IC Role / Device Role / Timing Role: Standby-mode voltage clamp referenced to MCU ground plane. Use Value: 200 mW power rating sustains short-duration surges without thermal runaway; SOD−323 fits near connector pads. |
| High-Density PC Board Voltage Reference | Handheld Portable Battery Monitoring |
Use Scenario: Providing stable 68 V reference for ADC input scaling in industrial sensor signal chains. IC Role / Device Role / Timing Role: Precision Zener used as passive voltage divider element in analog front-end. Use Value: ±5% VZ tolerance and 240 Ω ZZT ensure <1% full-scale error contribution at 2 mA bias. | Use Scenario: Overvoltage detection in lithium-ion battery pack management systems with 60–70 V nominal stacks. IC Role / Device Role / Timing Role: Threshold detector triggering shutdown when cell string voltage exceeds safe limit. Use Value: +1.2 mV/°C tempco allows calibrated trip-point adjustment across −40°C to +85°C operating range. |
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-B68,115 | 68 V ±5%, 300 mW rating, SOD-323 package, 100 Ω ZZT @ 5 mA | Higher power rating supports longer surge duration; higher test current shifts regulation point | Select when >200 mW surge energy absorption is required and board layout permits same footprint |
| MMSZ4689-TP | 68 V ±5%, 500 mW rating, SOD-123 package, 200 Ω ZZT @ 1 mA | Larger SOD-123 footprint (3.7 mm × 1.6 mm); lower test current yields different knee behavior | Choose when higher power handling is critical and PCB real estate allows larger package |
Compared with BZX384-B68 and MMSZ4689-TP, the MM3Z68VT1 offers tighter thermal resistance (635 °C/W vs. ~400–500 °C/W) and lower profile (0.9 mm vs. 1.1–1.3 mm), making it preferable for ultra-thin portable designs where height and thermal coupling to PCB are constrained.
Availability
MM3Z68VT1 is available at Aetrix Electronics and suitable for cellular phones, handheld portables, and high-density PC boards requiring stable component supply and RoHS-compliant sourcing.
Supply support for MM3Z68VT1 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 management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The MM3Z series is part of onsemi's precision Zener regulator portfolio designed specifically for space-constrained, low-power voltage reference and overvoltage protection in portable and high-density electronics.
FAQ
What is the Zener voltage tolerance of the MM3Z68VT1?
The MM3Z68VT1 has a nominal Zener voltage of 68 V with a tolerance of ±5%, corresponding to a guaranteed range of 64 V to 72 V when tested at IZT = 2 mA and TA = 25°C. This tolerance is confirmed in the Electrical Characteristics table on page 2 of the official datasheet (Rev. 7, November 2006). The MM3Z68VT1 maintains this specification across its qualified operating temperature range.
Does the MM3Z68VT1 support Pb-free soldering processes?
Yes, the MM3Z68VT1 is offered in a Pb-free package, indicated by the "G" suffix in the ordering code. Its leads are plated with pure tin (Sn-only), and the maximum soldering temperature is rated at 260°C for 10 seconds. The device complies with JEDEC J-STD-020 moisture sensitivity level (MSL) requirements and meets RoHS Directive 2011/65/EU. The MM3Z68VT1 is fully compatible with lead-free reflow profiles.
What is the maximum Zener impedance of the MM3Z68VT1 and at what condition is it specified?
The maximum Zener impedance (ZZT) of the MM3Z68VT1 is 240 Ω, specified at IZT = 2 mA and f = 1 kHz. This value reflects the dynamic resistance in the breakdown region and directly impacts regulation accuracy under varying load currents. The MM3Z68VT1's ZZT is higher than lower-voltage variants in the same series due to intrinsic semiconductor physics at 68 V, as documented in the Electrical Characteristics table.
Can the MM3Z68VT1 be used for ESD protection in USB 2.0 data lines?
No, the MM3Z68VT1 is not suitable for USB 2.0 data line protection because its 68 V Zener voltage is far above the 3.3 V or 5 V signaling levels and its 35 pF capacitance would degrade signal integrity at 480 Mbps. The MM3Z68VT1 is intended for power rail clamping (e.g., VBUS) or high-voltage reference applications-not high-speed signal lines. For data-line ESD protection, lower-voltage, low-capacitance TVS diodes are recommended.
How does the temperature coefficient of the MM3Z68VT1 affect its performance in automotive environments?
The MM3Z68VT1 has a positive temperature coefficient of +1.2 mV/°C near its nominal 68 V Zener voltage, meaning its clamping voltage increases linearly with junction temperature. In automotive cabin environments (−40°C to +105°C), this results in a total shift of approximately ±180 mV. System designers using the MM3Z68VT1 in such applications must account for this drift in overvoltage trip thresholds-especially critical in battery monitoring or DC-DC converter feedback paths where the MM3Z68VT1 serves as a reference.
MM3Z68VT1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 68 V
- Tolerance:
- ±6%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 240 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 47.6 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
MM3Z68VT1 FAQ
1.How can I place an order for MM3Z68VT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MM3Z68VT1 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 MM3Z68VT1 reliable?
The price and inventory of MM3Z68VT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MM3Z68VT1 is usually 5 days.
3.What payment methods are accepted for MM3Z68VT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MM3Z68VT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MM3Z68VT1?
MM3Z68VT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MM3Z68VT1 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 MM3Z68VT1?
For technical support, including MM3Z68VT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MM3Z68VT1 requirements.
6.How does Aetrix verify that MM3Z68VT1 is sourced from the original manufacturer or authorized distributors?
All MM3Z68VT1 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 MM3Z68VT1 meets industry standards.
7.What is the process for return or replacement of MM3Z68VT1?
All MM3Z68VT1 units undergo pre-shipment inspection (PSI). If there is an issue with MM3Z68VT1, 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 MM3Z68VT1 part is unused and in its original packaging.
Return procedure for MM3Z68VT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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