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onsemi SZMM3Z6V8ST1G
- Part No.:
- SZMM3Z6V8ST1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
SZMM3Z6V8ST1G.pdf
- Description:
- DIODE ZENER 6.8V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:6,565
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Product details
Overview
SZMM3Z6V8ST1G from onsemi is a 6.8 V ±5% Zener diode in SOD−323 package, rated for 500 mW steady-state power dissipation, with 160 Ω dynamic impedance at 5 mA test current and 2.0 μA reverse leakage at 4.0 V, used for precision voltage regulation in space-constrained portable electronics.
For engineers reviewing the SZMM3Z6V8ST1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5%), thermal resistance (250 °C/W with heatsink), ESD rating (>16 kV HBM), low capacitance (155 pF), and AEC−Q101 qualification for automotive use.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown to clamp voltage at 6.65–6.93 V under 5 mA test current. Its tight 5% tolerance and low temperature coefficient (1.2 mV/°C) support stable regulation across −65°C to +150°C junction temperature range.
Designed for surface-mount applications on high-density PCBs, it leverages the SOD−323 package's 1.7 mm × 1.25 mm footprint and 0.9 mm height. The cathode is marked by a polarity band, and the device meets UL 94 V−0 flammability rating with Pb−free, RoHS-compliant construction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 6.65–6.93 V at 5 mA - defines precise clamping threshold for 5 V rail protection or reference generation |
| Power Dissipation (PD) | 500 mW - supports continuous regulation in compact layouts without forced cooling |
| Zener Impedance (ZZT) | 160 Ω max at IZT = 5 mA - ensures minimal output voltage variation under load transients |
| Reverse Leakage (IR) | 2.0 μA max at VR = 4.0 V - enables low-power standby operation in battery-powered systems |
| Capacitance (C) | 155 pF max at VR = 0 V, f = 1 MHz - limits high-frequency noise coupling in signal-path protection |
| ESD Rating | Class 3 (>16 kV HBM) - provides robust handling in automated assembly and end-user environments |
| Temperature Coefficient | +1.2 mV/°C at IZT = 5 mA - enables predictable drift compensation in temperature-varying circuits |
Pinout & Package
SOD−323 surface-mount package: 1.70 mm × 1.25 mm × 0.85 mm body, cathode indicated by polarity band, anode unmarked; suitable for reflow soldering at 260°C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated voltage node; reverse-biased during Zener operation |
| 2 (Unmarked End) | Anode | Connected to ground or lower-potential reference; completes current path during regulation |
Key Features
| Feature | Design Value |
|---|---|
| Tight Zener Tolerance | ±5% VZ - reduces need for post-production trimming in voltage-reference designs |
| AEC−Q101 Qualification | Automotive-grade reliability - validated for under-hood and infotainment subsystems |
| Low Profile Height | 0.9 mm max - enables placement beneath connectors or shields in ultra-thin devices |
| Pb−Free & RoHS Compliance | Halogen-free/BFR-free materials - satisfies global environmental compliance requirements |
| High ESD Robustness | Class 3 HBM (>16 kV) - eliminates need for external ESD protection in many I/O interface designs |
Applications
| USB Power Input Protection | Smartphone Battery Monitoring |
|---|---|
Use Scenario: Clamping transient overvoltage on USB VBUS line during hot-plug events or ESD strikes. IC Role / Device Role / Timing Role: Two-terminal shunt regulator absorbing surge energy while holding voltage below IC damage threshold. Use Value: Prevents latch-up or permanent damage to USB controller ICs by limiting VBUS to ≤7.0 V during 15 kV contact ESD. | Use Scenario: Providing stable reference voltage for ADC measurement of Li-ion battery cell voltage. IC Role / Device Role / Timing Role: Precision voltage reference source feeding into analog front-end of fuel-gauge IC. Use Value: Enables ±1% state-of-charge accuracy over temperature due to tight VZ tolerance and low dVZ/dT. |
| Automotive Infotainment Display Bias | Industrial Sensor Signal Conditioning |
Use Scenario: Stabilizing bias voltage for OLED display driver ICs in vehicle dashboards exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Temperature-compensated voltage reference maintaining constant pixel drive voltage. Use Value: Eliminates brightness drift across −40°C to +85°C operating range, meeting AEC−Q200 display sub-system requirements. | Use Scenario: Protecting analog input pins of industrial PLC analog-to-digital converters from field-wiring transients. IC Role / Device Role / Timing Role: Low-capacitance shunt clamp placed directly at ADC input pin. Use Value: Limits induced voltage spikes to <7.0 V without degrading 100 kHz signal bandwidth due to 155 pF capacitance. |
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-B6V8,115 | Same 6.8 V nominal, ±5% tolerance, but SOD-323 package with 300 mW rating and higher ZZT (200 Ω) | Lacks AEC−Q101 qualification and automotive PPAP capability | Select when cost sensitivity outweighs automotive qualification or higher power margin is unnecessary |
| MMSZ4688T1G | 6.8 V nominal, ±5%, but SOD-123 package (larger footprint), 500 mW rating, ZZT = 150 Ω | Higher thermal resistance (350 °C/W) limits power handling in dense layouts | Select when board layout allows larger footprint and legacy SOD-123 tooling is preferred |
Compared with BZX384-B6V8,115 and MMSZ4688T1G, SZMM3Z6V8ST1G delivers superior thermal performance (250 °C/W with heatsink), automotive qualification, and tighter process control for high-reliability portable and vehicular applications - making it optimal where space, stability, and compliance are jointly constrained.
Availability
SZMM3Z6V8ST1G is available at Aetrix Electronics and suitable for USB power protection, smartphone battery monitoring, and automotive infotainment display bias requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SZMM3Z6V8ST1G 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 MM3Z/SZMM3Z series is designed specifically for space-constrained voltage regulation and ESD protection in portable, automotive, and high-density PCB applications - emphasizing tight tolerance, low profile, and automotive-grade reliability.
FAQ
What is the exact Zener voltage range specified for SZMM3Z6V8ST1G?
The SZMM3Z6V8ST1G has a guaranteed Zener voltage range of 6.65 V to 6.93 V at a test current of 5 mA, per the onsemi datasheet revision 27. This ±5% tolerance is measured under standard conditions (TA = 25°C) and reflects the device's tight regulation specification. The SZMM3Z6V8ST1G maintains this range across its qualified operating temperature span, supporting precision reference design without calibration.
Is SZMM3Z6V8ST1G suitable for automotive applications?
Yes, SZMM3Z6V8ST1G is AEC−Q101 qualified and PPAP capable, with explicit automotive suitability noted in its part prefix "SZ" and datasheet documentation. It meets stringent automotive reliability requirements including temperature cycling, humidity testing, and mechanical shock. The SZMM3Z6V8ST1G is routinely deployed in infotainment, body control, and ADAS subsystems where certified component assurance is mandatory.
What is the maximum reverse leakage current for SZMM3Z6V8ST1G and at what voltage is it specified?
The maximum reverse leakage current for SZMM3Z6V8ST1G is 2.0 μA, specified at a reverse voltage (VR) of 4.0 V and ambient temperature of 25°C. This low leakage supports energy-efficient operation in always-on circuits such as battery-monitoring paths or low-power sensor interfaces. The SZMM3Z6V8ST1G maintains leakage below 10 μA up to 6.0 V, ensuring predictable behavior near its knee voltage.
Does SZMM3Z6V8ST1G have RoHS and halogen-free compliance?
Yes, SZMM3Z6V8ST1G is fully RoHS compliant and constructed with halogen-free/BFR-free materials, as confirmed in the onsemi datasheet. The "G" suffix denotes Pb−free packaging, and the device carries UL 94 V−0 flammability rating. This compliance enables global deployment in consumer, medical, and industrial products subject to environmental regulatory mandates - a verified attribute of the SZMM3Z6V8ST1G.
What is the thermal resistance (RJA) of SZMM3Z6V8ST1G under standard PCB mounting conditions?
The thermal resistance from junction-to-ambient (RJA) for SZMM3Z6V8ST1G is 416 °C/W on a standard FR−4 board (1 cm² copper pad), and improves to 250 °C/W when mounted on a 38 mm² PCB with 1 in² copper heatsink. This dual-rating reflects real-world thermal design flexibility: the SZMM3Z6V8ST1G can sustain full 500 mW dissipation only with adequate copper area, critical for thermal validation in compact power-supply designs.
SZMM3Z6V8ST1G 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):
- 6.8 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 15 Ohms
- Current - Reverse Leakage @ Vr:
- 2 µA @ 4 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
SZMM3Z6V8ST1G FAQ
1.How can I place an order for SZMM3Z6V8ST1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMM3Z6V8ST1G 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 SZMM3Z6V8ST1G reliable?
The price and inventory of SZMM3Z6V8ST1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMM3Z6V8ST1G is usually 5 days.
3.What payment methods are accepted for SZMM3Z6V8ST1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMM3Z6V8ST1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMM3Z6V8ST1G?
SZMM3Z6V8ST1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMM3Z6V8ST1G 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 SZMM3Z6V8ST1G?
For technical support, including SZMM3Z6V8ST1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMM3Z6V8ST1G requirements.
6.How does Aetrix verify that SZMM3Z6V8ST1G is sourced from the original manufacturer or authorized distributors?
All SZMM3Z6V8ST1G 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 SZMM3Z6V8ST1G meets industry standards.
7.What is the process for return or replacement of SZMM3Z6V8ST1G?
All SZMM3Z6V8ST1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMM3Z6V8ST1G, 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 SZMM3Z6V8ST1G part is unused and in its original packaging.
Return procedure for SZMM3Z6V8ST1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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