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onsemi SZMM3Z68VT1G
- Part No.:
- SZMM3Z68VT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
SZMM3Z68VT1G.pdf
- Description:
- DIODE ZENER 68V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:5,960
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Product details
Overview
SZMM3Z68VT1G from onsemi is a 68 V, 300 mW Zener voltage regulator diode in SOD−323 package, designed for precision voltage reference and overvoltage protection in space-constrained circuits such as portable power rails and I/O interface clamping. It delivers ±5% nominal Zener voltage tolerance at 2 mA test current, exhibits 240 Ω dynamic impedance at IZT, and supports −65°C to +150°C junction temperature operation.
For engineers reviewing the SZMM3Z68VT1G datasheet, pinout, applications, or equivalent options, key selection criteria include its 68 V regulation point, 300 mW power rating on FR-4 board, 240 Ω Zener impedance at 2 mA, 0.05 μA leakage at 47.6 V reverse bias, and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This device operates as a two-terminal, cathode-anode polarized silicon Zener diode optimized for stable reverse-biased breakdown. Its regulation behavior is defined by a nominal 68 V Zener voltage (64–72 V range), with dynamic impedance of 240 Ω measured at 2 mA test current and 500 Ω maximum impedance at knee current (IZK = 0.5 mA).
Thermal performance is characterized by 416°C/W junction-to-ambient thermal resistance on FR-4 board, enabling 300 mW steady-state dissipation at 25°C ambient, derated linearly above that temperature. The device features Class 3 ESD robustness (>16 kV HBM) and Pb-free SOD−323 packaging compliant with UL 94 V−0 flammability rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 64–72 V at IZT = 2 mA - defines precise clamping threshold for overvoltage protection or reference generation |
| Power Dissipation (PD) | 300 mW on FR-4 board @ 25°C - sets maximum continuous power handling without forced cooling |
| Zener Impedance (ZZT) | 240 Ω @ IZT = 2 mA - determines regulation stability under varying load current |
| Leakage Current (IR) | 0.05 μA @ VR = 47.6 V - ensures minimal standby current in high-impedance bias networks |
| ESD Rating | Class 3 (>16 kV HBM) - provides robust handling during automated assembly and field operation |
| Operating Temperature | −65°C to +150°C - supports deployment in automotive engine compartments and industrial environments |
| AEC-Q101 Qualified | Yes - validates reliability for automotive electronics applications per stress-test requirements |
Pinout & Package
SZMM3Z68VT1G is housed in a surface-mount SOD−323 (Case 477) plastic package measuring 1.7 mm × 1.25 mm × 0.9 mm, with cathode indicated by a polarity band. The package is void-free, transfer-molded, corrosion-resistant, and UL 94 V−0 rated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Reverse-biased Zener terminal | Connected to higher-potential node in clamp/reference configuration; polarity band identifies this terminal |
| 2 (Anode) | Reference/ground return terminal | Typically tied to system ground or low-side reference; completes Zener conduction path during breakdown |
Key Features
| Feature | Design Value |
|---|---|
| Automotive-grade qualification | AEC-Q101 qualified and PPAP capable - enables use in safety-critical vehicle subsystems without additional qualification effort |
| Pb-free construction | RoHS-compliant Sn-only or Pb-Sn plating - meets global environmental compliance mandates and reflow soldering standards |
| Low-profile packaging | 0.9 mm height - allows integration into ultra-thin portable devices and high-density PCB layouts |
| High ESD immunity | Class 3 HBM (>16 kV) - eliminates need for external ESD protection in I/O line applications |
| Stable temperature coefficient | +1.2 mV/°C typical - minimizes drift across operating temperature range in precision reference designs |
Applications
| USB Power Delivery Clamp | Automotive Sensor Reference |
|---|---|
Use Scenario: Clamping transient surges on USB PD CC lines during hot-plug events. IC Role / Device Role / Timing Role: Two-terminal Zener clamp protecting USB PD controller I/O pins from >20 V transients. Use Value: 68 V breakdown prevents false triggering while allowing safe margin above 20 V PD bus swing; 240 Ω ZZT ensures fast response without excessive overshoot. | Use Scenario: Providing stable 68 V reference for analog front-end conditioning in engine control unit sensors. IC Role / Device Role / Timing Role: Precision voltage reference source for ADC biasing and signal scaling in harsh-temperature sensor interfaces. Use Value: AEC-Q101 qualification and −65°C to +150°C operation ensure long-term stability in under-hood environments; low leakage preserves accuracy in high-impedance divider networks. |
| Industrial PLC Input Protection | Telecom Line Interface Clamp |
Use Scenario: Protecting 24 V DC digital input channels in programmable logic controllers against induced surges. IC Role / Device Role / Timing Role: Overvoltage clamp placed between field input and optocoupler input stage. Use Value: 300 mW power rating sustains repetitive 100 V/100 ms transients per IEC 61000-4-5; SOD−323 footprint enables dense channel spacing on modular I/O cards. | Use Scenario: Surge suppression on Ethernet PHY auxiliary power lines exposed to lightning-induced coupling. IC Role / Device Role / Timing Role: Secondary-level Zener clamp downstream of primary gas discharge tube (GDT) protection. Use Value: 0.05 μA leakage at 47.6 V ensures negligible loading on 48 V phantom power rails; Class 3 ESD rating guards against handling damage during board assembly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B68,115 | 68 V, 300 mW, SOD-323, but ±5% tolerance only at IZT = 5 mA; ZZT = 160 Ω | Higher test current requirement shifts operating point; lower impedance improves regulation but increases bias current demand | Select when tighter regulation under higher bias current is prioritized over low-leakage operation |
| MMSZ5262T1G | 68 V, 500 mW, SOD-123, ZZT = 150 Ω @ 10 mA; no AEC-Q101 qualification | Larger package and higher power rating suit less space-constrained boards; lacks automotive qualification | Choose for non-automotive industrial applications requiring higher surge energy absorption |
Compared with BZX384-B68,115 and MMSZ5262T1G, SZMM3Z68VT1G offers superior low-current leakage (0.05 μA vs. ≥0.1 μA), AEC-Q101 qualification for automotive use, and optimized 2 mA test condition matching typical low-power reference designs - making it preferred for battery-sensitive and automotive-qualified systems.
Availability
SZMM3Z68VT1G is available at Aetrix Electronics and suitable for USB power delivery protection, automotive sensor reference circuits, and industrial PLC input protection requiring stable component supply, consistent lead-time visibility, and full traceability.
Supply support for SZMM3Z68VT1G 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 delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
SZMM3Z68VT1G belongs to the MM3ZxxxT1G/SZMM3ZxxxT1G series - a family of 300 mW Zener regulators engineered specifically for compact, high-reliability voltage reference and transient suppression in automotive and portable electronics.
FAQ
What is the Zener voltage tolerance of SZMM3Z68VT1G?
SZMM3Z68VT1G has a nominal Zener voltage of 68 V with a tolerance range of 64 V to 72 V, specified at a test current of 2 mA and ambient temperature of 25°C. This ±5.9% tolerance reflects manufacturing variation and ensures predictable clamping behavior across production lots. The device's actual breakdown voltage remains within this window under standard operating conditions, supporting reliable design margining in overvoltage protection circuits.
Is SZMM3Z68VT1G suitable for automotive applications?
Yes, SZMM3Z68VT1G is AEC-Q101 qualified and PPAP capable, confirming its suitability for automotive applications including engine control units, body electronics, and ADAS sensor interfaces. Its guaranteed operation from −65°C to +150°C, Class 3 ESD rating (>16 kV HBM), and Pb-free SOD−323 packaging meet stringent automotive reliability and environmental requirements. The "SZ" prefix explicitly denotes automotive-grade process control and site-specific qualification.
What is the maximum power dissipation of SZMM3Z68VT1G on a standard PCB?
SZMM3Z68VT1G delivers a steady-state power dissipation of 300 mW on an FR-4 printed circuit board with a single-sided 1 cm² copper pad at 25°C ambient temperature. Above 25°C, power must be linearly derated at 2.4 mW/°C, reaching zero dissipation at approximately 150°C ambient. This rating assumes natural convection cooling and is validated per the manufacturer's thermal test setup described in the datasheet.
How does the Zener impedance of SZMM3Z68VT1G affect regulation performance?
SZMM3Z68VT1G exhibits a dynamic Zener impedance (ZZT) of 240 Ω at 2 mA test current, which directly impacts output voltage stability under varying load conditions. Lower impedance yields tighter regulation - for example, a 1 mA change in Zener current causes ~240 mV shift in clamping voltage. This value is measured under AC small-signal conditions at 1 kHz and informs design decisions for noise-sensitive references or fast transient suppression where voltage droop must be minimized.
What marking code identifies SZMM3Z68VT1G on the device body?
SZMM3Z68VT1G is marked with "1F" on the top surface of the SOD−323 package, per the device marking column in the Electrical Characteristics table. The cathode is identified by a polarity band adjacent to pin 1. This marking aligns with the full ordering part number and enables visual verification during inspection and rework. No date code or microdot orientation is required for functional identification of SZMM3Z68VT1G.
SZMM3Z68VT1G 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):
- 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 A
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
SZMM3Z68VT1G FAQ
1.How can I place an order for SZMM3Z68VT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMM3Z68VT1G 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 SZMM3Z68VT1G reliable?
The price and inventory of SZMM3Z68VT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMM3Z68VT1G is usually 5 days.
3.What payment methods are accepted for SZMM3Z68VT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMM3Z68VT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMM3Z68VT1G?
SZMM3Z68VT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMM3Z68VT1G 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 SZMM3Z68VT1G?
For technical support, including SZMM3Z68VT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMM3Z68VT1G requirements.
6.How does Aetrix verify that SZMM3Z68VT1G is sourced from the original manufacturer or authorized distributors?
All SZMM3Z68VT1G 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 SZMM3Z68VT1G meets industry standards.
7.What is the process for return or replacement of SZMM3Z68VT1G?
All SZMM3Z68VT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMM3Z68VT1G, 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 SZMM3Z68VT1G part is unused and in its original packaging.
Return procedure for SZMM3Z68VT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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