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onsemi SZMM3Z9V1ST1G
- Part No.:
- SZMM3Z9V1ST1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
SZMM3Z9V1ST1G.pdf
- Description:
- DIODE ZENER 9.1V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:26,054
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Product details
Overview
SZMM3Z9V1ST1G from onsemi is a 9.1 V ±3.8% Zener diode in SOD−323 package, rated for 500 mW steady-state power dissipation, 15 Ω dynamic impedance at 5 mA test current, and 0.5 μA reverse leakage at 6.0 V, used for precision voltage reference and overvoltage protection in space-constrained portable electronics.
For engineers reviewing the SZMM3Z9V1ST1G datasheet, pinout, applications, or equivalent options, key selection factors include Zener voltage tolerance (±3.8%), low capacitance (130 pF), AEC−Q101 qualification, thermal resistance (250 °C/W with heatsink), and SOD−323 footprint compatibility.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown to clamp or regulate voltage at nominal 9.1 V. Its tight 3.8% tolerance and low 15 Ω Zener impedance at 5 mA ensure stable regulation under varying load conditions.
Designed for surface-mount use in high-density PCBs, it features Class 3 ESD rating (>16 kV HBM), Pb-free/RoHS-compliant construction, and UL 94 V−0 flammability compliance - all within a 1.7 mm × 1.25 mm × 0.9 mm SOD−323 outline.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 8.85 V to 9.23 V at IZT = 5 mA - defines precise clamping threshold for protection or reference circuits |
| Power Dissipation | 500 mW (with heatsink); derates to 4.0 mW/°C above 25°C - sets maximum continuous power handling in compact layouts |
| Zener Impedance (ZZT) | 15 Ω max at IZT = 5 mA - ensures minimal voltage shift under dynamic load changes |
| Reverse Leakage (IR) | 0.5 μA max at VR = 6.0 V - guarantees low standby current in battery-powered systems |
| Capacitance | 130 pF max at VR = 0 V, f = 1 MHz - limits signal distortion in high-frequency bypass or ESD-clamp roles |
| ESD Rating | Class 3 (>16 kV) per Human Body Model - provides robust system-level ESD immunity without external protection |
| Temperature Coefficient | +3.8 mV/°C at IZT = 5 mA - enables predictable drift compensation in temperature-sensitive references |
Pinout & Package
SOD−323 surface-mount package: 1.70 mm × 1.25 mm × 0.90 mm body, cathode indicated by polarity band, Pb-free plating, UL 94 V−0 rated, mountable in any orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated output or protected node; reverse-biased during Zener operation |
| 2 (Non-banded End) | Anode | Connected to ground or lower-potential rail; completes conduction path during breakdown |
Key Features
| Feature | Design Value |
|---|---|
| Tight Zener Tolerance | ±3.8% at 9.1 V - reduces need for post-production calibration in precision analog circuits |
| AEC−Q101 Qualification | Automotive-grade reliability with PPAP capability - supports deployment in infotainment and ADAS subsystems |
| Low Profile Height | 0.9 mm max - enables stacking under shields or placement beneath connectors in ultra-thin devices |
| High ESD Robustness | Class 3 (>16 kV HBM) - eliminates need for supplemental TVS in many handheld interface ports |
| Pb-Free & RoHS Compliant | Sn-only or Pb−Sn plating, halogen-free/BFR-free molding compound - meets global environmental compliance mandates |
Applications
| Smartphone Power Rail Protection | USB-C Port ESD Clamp |
|---|---|
Use Scenario: Protecting 9 V auxiliary rails in smartphone PMIC outputs from transient surges during charging or accessory insertion. IC Role / Device Role: Two-terminal shunt regulator clamping voltage to 9.1 V with sub-μA leakage. Use Value: Prevents overvoltage damage to downstream LDOs and sensors while occupying <2.2 mm² PCB area. | Use Scenario: Suppressing ESD events on USB-C CC and VCONN lines before they reach controller ICs. IC Role / Device Role: Fast-response Zener clamp absorbing >15 kV HBM pulses without latch-up. Use Value: Achieves IEC 61000-4-2 Level 4 compliance with no additional layout area beyond standard SOD−323 footprint. |
| Automotive Cabin Controller Reference | Wearable Sensor Bias Supply |
Use Scenario: Providing stable 9.1 V reference for ADC biasing in HVAC control modules operating across −40°C to +125°C. IC Role / Device Role: Temperature-compensated Zener reference with +3.8 mV/°C TC and AEC−Q101 validation. Use Value: Maintains <±1% reference accuracy over full automotive temperature range without trimming components. | Use Scenario: Generating low-noise bias voltage for MEMS accelerometer signal conditioning in hearables. IC Role / Device Role: Low-capacitance (130 pF) Zener stabilizing supply rail adjacent to RF sections. Use Value: Minimizes coupling into sensitive analog front-end while drawing only 0.5 μA at 6 V reverse bias. |
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-B9V1,115 | Same 9.1 V nominal, ±5% tolerance (vs. ±3.8%), 300 mW power rating, SOD-323 package | Higher voltage drift and lower power margin limit use in thermally constrained or precision reference roles | Select when cost sensitivity outweighs tolerance and power requirements |
| MMSZ5240B-TP | 9.1 V nominal, ±5% tolerance, 500 mW rating, but SOD-123 package (2.7 mm × 1.4 mm) - 60% larger footprint | Larger size prevents drop-in replacement on high-density layouts; thermal resistance higher at 350 °C/W | Choose only if existing SOD-123 land pattern is fixed and board re-spin is prohibitive |
Compared with BZX384-B9V1,115 and MMSZ5240B-TP, SZMM3Z9V1ST1G delivers tighter voltage tolerance, superior thermal performance in compact layouts, and automotive qualification - making it optimal for next-gen portable and automotive edge nodes where space, stability, and reliability are co-constrained.
Availability
SZMM3Z9V1ST1G is available at Aetrix Electronics and suitable for smartphone power rail protection, USB-C port ESD clamping, and automotive cabin controller reference requiring stable component supply across extended temperature ranges and high-volume production cycles.
Supply support for SZMM3Z9V1ST1G 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.
SZMM3ZxxxST1G belongs to onsemi's automotive-qualified Zener diode portfolio, engineered specifically for space-constrained, high-reliability voltage regulation and transient suppression in safety-critical and portable electronic systems.
FAQ
What is the Zener voltage tolerance of SZMM3Z9V1ST1G?
The SZMM3Z9V1ST1G has a Zener voltage tolerance of ±3.8% at 9.1 V nominal, measured at 5 mA test current. This tight tolerance is specified in the Electrical Characteristics table on page 3 of the onsemi datasheet and enables accurate voltage clamping without post-manufacturing trimming. The SZMM3Z9V1ST1G achieves this via process-controlled doping and screening, distinguishing it from broader-tolerance alternatives like BZX384-B9V1,115 (±5%).
Is SZMM3Z9V1ST1G qualified for automotive applications?
Yes, SZMM3Z9V1ST1G is AEC−Q101 qualified and PPAP capable, as explicitly stated in the "Specification Features" section of the onsemi datasheet. The "SZ" prefix denotes automotive and other applications requiring unique site and control change requirements. This qualification covers temperature cycling, humidity testing, and mechanical shock per AEC−Q101 standards, confirming suitability for infotainment, body control, and ADAS subsystems.
What is the maximum reverse leakage current for SZMM3Z9V1ST1G?
The maximum reverse leakage current for SZMM3Z9V1ST1G is 0.5 μA at VR = 6.0 V, per the Electrical Characteristics table on page 3 of the onsemi datasheet. This value is confirmed under standard test conditions (TA = 25°C) and reflects the device's low standby power consumption - critical for battery-operated devices where SZMM3Z9V1ST1G serves as a voltage reference or protection element.
Does SZMM3Z9V1ST1G have an ESD rating, and if so, what is it?
SZMM3Z9V1ST1G carries a Class 3 ESD rating (>16 kV) per the Human Body Model (HBM), as documented in the "Specification Features" section of the onsemi datasheet. This high level of intrinsic ESD robustness eliminates the need for external TVS diodes in many interface protection designs and is validated through standardized HBM testing per JESD22-A114.
What is the thermal resistance (RJA) of SZMM3Z9V1ST1G under standard PCB conditions?
The thermal resistance (RJA) of SZMM3Z9V1ST1G is 250 °C/W when mounted on an FR−4 PCB with a 0.72 mm² mounting pad and 38 mm² copper heatsink (Note 2, Maximum Ratings table). This value is significantly lower than the 416 °C/W rating for minimal-pad layouts, highlighting the importance of proper thermal land design to sustain its 500 mW power rating in real-world applications using SZMM3Z9V1ST1G.
SZMM3Z9V1ST1G 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):
- 9.1 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 15 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 6 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
SZMM3Z9V1ST1G FAQ
1.How can I place an order for SZMM3Z9V1ST1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMM3Z9V1ST1G 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 SZMM3Z9V1ST1G reliable?
The price and inventory of SZMM3Z9V1ST1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMM3Z9V1ST1G is usually 5 days.
3.What payment methods are accepted for SZMM3Z9V1ST1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMM3Z9V1ST1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMM3Z9V1ST1G?
SZMM3Z9V1ST1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMM3Z9V1ST1G 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 SZMM3Z9V1ST1G?
For technical support, including SZMM3Z9V1ST1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMM3Z9V1ST1G requirements.
6.How does Aetrix verify that SZMM3Z9V1ST1G is sourced from the original manufacturer or authorized distributors?
All SZMM3Z9V1ST1G 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 SZMM3Z9V1ST1G meets industry standards.
7.What is the process for return or replacement of SZMM3Z9V1ST1G?
All SZMM3Z9V1ST1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMM3Z9V1ST1G, 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 SZMM3Z9V1ST1G part is unused and in its original packaging.
Return procedure for SZMM3Z9V1ST1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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