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onsemi SZMM3Z3V9T1G
- Part No.:
- SZMM3Z3V9T1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
SZMM3Z3V9T1G.pdf
- Description:
- DIODE ZENER 3.9V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:7,307
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Product details
Overview
SZMM3Z3V9T1G from onsemi is a 3.9 V ±0.2 V Zener voltage regulator diode in SOD−323 package, rated for 300 mW steady-state power dissipation at 25°C, with 90 Ω maximum Zener impedance at 5 mA test current and 3 µA reverse leakage current at 1.0 V reverse bias - used for precision low-voltage reference and overvoltage protection in space-constrained portable electronics.
For engineers reviewing the SZMM3Z3V9T1G datasheet, pinout, applications, or equivalent options, key selection factors include its AEC−Q101 qualification, −2.5 mV/°C temperature coefficient, 450 pF capacitance at 0 V/1 MHz, Pb−free SOD−323 footprint, and cathode-band polarity marking for reliable board-level integration.
Technical Context
This device operates as a two-terminal voltage reference, conducting in reverse breakdown to clamp voltage across load circuits. Its Zener voltage is specified at 3.7–4.1 V (nominal 3.9 V) with 5 mA test current, and it maintains regulation down to 0.5 mA minimum Zener current.
Thermal derating begins above 25°C at 2.4 mW/°C, with junction-to-ambient thermal resistance of 416 °C/W on FR−4 board. It features Class 3 ESD robustness (>16 kV HBM) and UL 94 V−0 flammability rating, supporting automotive and high-reliability portable applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.7–4.1 V @ IZT = 5 mA - defines stable clamping threshold for 3.3 V rail protection and reference generation. |
| Zener Impedance (ZZT) | ≤90 Ω @ 5 mA - ensures minimal voltage deviation under dynamic load transients. |
| Power Dissipation (PD) | 300 mW @ TA = 25°C - supports continuous operation in compact PCB layouts without forced cooling. |
| Reverse Leakage (IR) | ≤3 µA @ VR = 1.0 V - guarantees low standby current in battery-powered systems. |
| Temp. Coefficient (αVZ) | −2.5 mV/°C - enables predictable drift compensation in temperature-sensitive analog circuits. |
| Capacitance (C) | 450 pF @ 0 V, 1 MHz - impacts high-frequency noise filtering capability and signal integrity in RF-adjacent designs. |
| ESD Rating | Class 3 (>16 kV HBM) - provides robust handling during automated assembly and end-user operation. |
Pinout & Package
SZMM3Z3V9T1G is housed in a Pb−free SOD−323 surface-mount package (Case 477−02), measuring 1.7 mm × 1.25 mm × 0.9 mm with cathode indicated by a band. Mounting position is unrestricted; soldering max temperature is 260°C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated output node; reverse-biased terminal where Zener breakdown occurs. |
| 2 (Non-banded End) | Anode | Connected to ground or lower-potential reference; completes current path during regulation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC−Q101 Qualified | Validated for automotive electronics use with PPAP capability and controlled manufacturing site requirements. |
| Low Profile (0.9 mm height) | Enables stacking under shields or placement beneath connectors in ultra-thin handheld PCBs. |
| Pb−Free & RoHS Compliant | Meets global environmental regulations and supports lead-free reflow soldering profiles without reliability compromise. |
| High ESD Robustness | Withstands >16 kV human-body-model discharge, reducing need for external TVS protection in consumer interfaces. |
| Stable Low-Voltage Reference | 3.9 V nominal Zener with tight 0.4 V tolerance and −2.5 mV/°C TC enables accurate ADC reference or LDO feedback. |
Applications
| Smartphone Power Management | Automotive Body Control Module |
|---|---|
|
Use Scenario: Regulating 3.3 V supply rail for baseband processor I/O and sensor interface circuitry. IC Role / Device Role / Timing Role: Zener voltage clamp protecting downstream logic from transient overvoltage events. Use Value: 300 mW power rating and 90 Ω Zener impedance ensure stable clamping during fast load-switching spikes without thermal runaway. |
Use Scenario: Providing reference voltage for LIN bus transceiver biasing and microcontroller reset monitoring. IC Role / Device Role / Timing Role: Precision 3.9 V reference source for analog comparators and voltage supervisors. Use Value: AEC−Q101 qualification and −2.5 mV/°C tempco support reliable operation across −40°C to +125°C ambient range. |
| Wearable Health Sensor Node | Industrial IoT Edge Controller |
|
Use Scenario: Stabilizing bias voltage for low-noise op-amps conditioning ECG/PPG analog front-end signals. IC Role / Device Role / Timing Role: Low-capacitance (450 pF) voltage reference minimizing signal path distortion. Use Value: 450 pF capacitance at 0 V/1 MHz avoids resonance with trace inductance in high-gain analog stages. |
Use Scenario: Overvoltage protection on 5 V auxiliary power input feeding isolated RS-485 transceivers. IC Role / Device Role / Timing Role: Clamp diode shunting surge energy before it reaches sensitive communication ICs. Use Value: 3 µA leakage at 1.0 V reverse bias preserves system quiescent current budget in always-on monitoring modes. |
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-B3V9,115 | 3.9 V ±5% tolerance, 300 mW, SOD-323, but no AEC−Q101 qualification or −2.5 mV/°C tempco spec. | Targeted at commercial-grade consumer products, not automotive or extended-temperature industrial use. | Select when cost sensitivity outweighs automotive compliance and tighter tempco requirements. |
| MMSZ4685T1G | 3.9 V ±5%, 500 mW rating, SOD-123 package (larger footprint), higher 100 Ω ZZT, no AEC−Q101. | Used where higher power margin is needed and PCB area allows larger SOD-123 placement. | Choose only if 500 mW dissipation is required and SOD-323 footprint constraint does not apply. |
Compared with BZX384-B3V9,115 and MMSZ4685T1G, SZMM3Z3V9T1G uniquely combines AEC−Q101 qualification, −2.5 mV/°C temperature coefficient, and SOD−323 size - making it the sole option for automotive-grade, thermally stable, space-constrained 3.9 V regulation.
Availability
SZMM3Z3V9T1G is available at Aetrix Electronics and suitable for smartphone power management, automotive body control modules, wearable health sensor nodes, and industrial IoT edge controllers requiring stable component supply across production lifecycles.
Supply support for SZMM3Z3V9T1G 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 (Nasdaq: ON) is a global semiconductor supplier delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
SZMM3Z3V9T1G belongs to the MM3ZxxxT1G/SZMM3ZxxxT1G series - engineered for compact, high-reliability voltage regulation in portable and automotive electronics where space, thermal performance, and qualification rigor are critical.
FAQ
What is the Zener voltage tolerance of SZMM3Z3V9T1G?
The SZMM3Z3V9T1G has a Zener voltage range of 3.7 V to 4.1 V at 5 mA test current, corresponding to a nominal 3.9 V with ±0.2 V absolute tolerance. This tight specification supports precision voltage clamping in 3.3 V system rails and reference design where ±5% variation is insufficient.
Is SZMM3Z3V9T1G qualified for automotive applications?
Yes, SZMM3Z3V9T1G carries the "SZ" prefix indicating AEC−Q101 qualification and PPAP capability. It meets automotive-grade reliability standards including stress testing, lot traceability, and controlled manufacturing site requirements - unlike standard MM3Z3V9T1G variants.
What is the maximum operating temperature for SZMM3Z3V9T1G?
The junction and storage temperature range for SZMM3Z3V9T1G is −65°C to +150°C. Its thermal resistance (RJA) is 416°C/W on FR−4 board, and power derating begins linearly above 25°C at 2.4 mW/°C - allowing safe operation up to +125°C ambient in properly designed layouts.
How is polarity identified on SZMM3Z3V9T1G?
SZMM3Z3V9T1G uses a cathode band marking on the SOD−323 package - the banded end is Pin 1 (Cathode), and the non-banded end is Pin 2 (Anode). This matches the standard SOD−323 polarity convention and is verified in the device marking diagram on page 1 of the official datasheet.
Does SZMM3Z3V9T1G support lead-free soldering processes?
Yes, SZMM3Z3V9T1G is Pb−free and RoHS compliant, with Sn-only or Pb−Sn plating on leads. Its maximum soldering temperature is rated at 260°C for 10 seconds - fully compatible with standard lead-free reflow profiles per IPC/JEDEC J-STD-020.
SZMM3Z3V9T1G 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):
- 3.9 V
- Tolerance:
- ±5%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 90 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 1 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
SZMM3Z3V9T1G FAQ
1.How can I place an order for SZMM3Z3V9T1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMM3Z3V9T1G 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 SZMM3Z3V9T1G reliable?
The price and inventory of SZMM3Z3V9T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMM3Z3V9T1G is usually 5 days.
3.What payment methods are accepted for SZMM3Z3V9T1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMM3Z3V9T1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMM3Z3V9T1G?
SZMM3Z3V9T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMM3Z3V9T1G 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 SZMM3Z3V9T1G?
For technical support, including SZMM3Z3V9T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMM3Z3V9T1G requirements.
6.How does Aetrix verify that SZMM3Z3V9T1G is sourced from the original manufacturer or authorized distributors?
All SZMM3Z3V9T1G 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 SZMM3Z3V9T1G meets industry standards.
7.What is the process for return or replacement of SZMM3Z3V9T1G?
All SZMM3Z3V9T1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMM3Z3V9T1G, 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 SZMM3Z3V9T1G part is unused and in its original packaging.
Return procedure for SZMM3Z3V9T1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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