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onsemi SZMM5Z39VT1G
- Part No.:
- SZMM5Z39VT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
SZMM5Z39VT1G.pdf
- Description:
- DIODE ZENER 39V 500MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:6,649
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Product details
Overview
SZMM5Z39VT1G from onsemi is a 39 V ±5% Zener diode in SOD-523 package, rated for 500 mW steady-state power dissipation, 130 Ω max Zener impedance at 1 mA test current, and 0.05 μA reverse leakage at 31.2 V, used for precision voltage clamping and overvoltage protection in space-constrained portable electronics.
For engineers reviewing the SZMM5Z39VT1G datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal derating behavior, AEC-Q101 qualification status, and direct alternatives with documented Zener voltage tolerance and impedance differences.
Technical Context
This device operates as a two-terminal voltage reference diode with sharp reverse breakdown at nominal 39 V, specified under pulsed 1 mA test current (IZT = 1 mA) per JEDEC standards. Its 130 Ω dynamic impedance (ZZT) and 0.05 μA leakage at VR = 31.2 V define regulation accuracy in low-current bias networks.
The SOD-523 package enables surface-mount integration on high-density PCBs, with MSL 1 reflow compatibility up to 260 °C and 16 kV HBM ESD rating. It is Pb-free, RoHS-compliant, and qualified to AEC-Q101 for automotive-grade reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 37 V min / 39 V nom / 41 V max @ IZT = 1 mA - defines clamping window for overvoltage protection circuits |
| Zener Impedance (ZZT) | 130 Ω max @ IZT = 1 mA - determines regulation stiffness under varying load current |
| Power Dissipation (PD) | 500 mW @ TA = 25 °C, derates 4.0 mW/°C above - sets maximum continuous thermal load on FR-4 board |
| Reverse Leakage (IR) | 0.05 μA max @ VR = 31.2 V - ensures minimal quiescent current in standby voltage-monitoring paths |
| ESD Rating | Class 3 (>16 kV) HBM - supports robust handling in manual assembly and field-replaceable modules |
| Temperature Coefficient | 27.3 mV/°C @ IZT - quantifies VZ drift across operating temperature range |
| Capacitance | 45 pF max @ VR = 0 V, f = 1 MHz - impacts high-frequency noise filtering capability in RF-adjacent circuits |
Pinout & Package
SOD-523 package: 1.20 mm × 0.80 mm body, 0.60 mm height, matte tin lead finish, void-free thermoset epoxy (UL 94 V-0), MSL 1, 260 °C max reflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated output node; reverse-biased during Zener operation |
| 2 | Anode | Connected to ground or lower-potential rail; completes conduction path during breakdown |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 Qualified | Validated for automotive applications including infotainment power rails and sensor interface protection |
| Low Profile SOD-523 | Enables placement beneath connectors or near BGA packages without height interference |
| 16 kV HBM ESD Robustness | Eliminates need for external ESD diodes in handheld USB/UART port protection |
| Pb-Free & RoHS Compliant | Meets global environmental compliance requirements for consumer and industrial end equipment |
Applications
| Smartphone Power Management | Automotive Camera Module Protection |
|---|---|
Use Scenario: Clamping transient spikes on 3.3 V or 5 V camera sensor supply lines during hot-plug events. IC Role / Device Role: Overvoltage clamp protecting image sensor ICs and MIPI interface transceivers. Use Value: Prevents latch-up or gate oxide damage using 39 V standoff with <0.05 μA leakage in sleep mode. | Use Scenario: Suppressing load-dump transients on 12 V camera module input rails in ADAS systems. IC Role / Device Role: Secondary clamping element downstream of TVS diodes, absorbing residual energy below 41 V. Use Value: Provides precise 39 V threshold with 130 Ω impedance to limit clamping voltage overshoot during fast transients. |
| Wearable Health Monitor Reference | Industrial IoT Sensor Node |
Use Scenario: Stabilizing reference voltage for analog front-end ADCs measuring biopotentials (ECG/PPG). IC Role / Device Role: Low-drift Zener reference source for ratiometric measurement circuits. Use Value: Delivers 39 V nominal regulation with 27.3 mV/°C TC, enabling <±1% total error over −40 to +85 °C. | Use Scenario: Protecting RS-485 transceiver VCC pins from induced surges on long industrial bus cables. IC Role / Device Role: Localized rail clamp adjacent to transceiver IC, minimizing trace inductance effects. Use Value: 500 mW rating sustains 1 ms surge events while 45 pF capacitance avoids signal integrity degradation at 10 Mbps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584-C39 | 39 V ±5%, 300 mW rating, SOD-323 package, 120 Ω ZZT @ 5 mA | Lower power rating limits sustained clamping duty cycle; higher test current shifts operating point | Select when board space allows SOD-323 and thermal budget restricts to ≤300 mW average dissipation |
| MMSZ5241BT1G | 39 V ±5%, 500 mW, SOD-123 package, 150 Ω ZZT @ 20 mA | Larger footprint (3.5 mm × 1.6 mm) but higher surge current capability due to thermal mass | Select when mechanical robustness or IEC 61000-4-5 surge margin outweighs size constraints |
Compared with SZMM5Z39VT1G, BZX584-C39 offers tighter ZZT but reduced power handling, while MMSZ5241BT1G trades miniaturization for enhanced surge endurance-choice depends on whether PCB area, thermal design, or transient energy absorption dominates the system requirement.
Availability
SZMM5Z39VT1G is available at Aetrix Electronics and suitable for smartphone power management, automotive camera module protection, and wearable health monitor reference designs requiring stable component supply with AEC-Q101 qualification and Pb-free compliance.
Supply support for SZMM5Z39VT1G 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 specializing in energy-efficient silicon solutions for automotive, industrial, cloud, and IoT applications.
SZMM5ZxxxT1G series targets space-constrained, high-reliability applications requiring AEC-Q101-qualified Zener protection with ultra-small SOD-523 packaging and Class 3 ESD robustness.
FAQ
What is the Zener voltage tolerance of SZMM5Z39VT1G?
SZMM5Z39VT1G has a nominal Zener voltage of 39 V with a tolerance of ±5%, meaning the actual measured VZ falls between 37 V and 41 V when tested at IZT = 1 mA and TA = 25 °C. This tolerance is confirmed in the Electrical Characteristics table on page 3 of the official onsemi datasheet (Rev. 19, April 2025).
Is SZMM5Z39VT1G suitable for automotive applications?
Yes, SZMM5Z39VT1G is AEC-Q101 qualified and PPAP capable, with the "SZ" prefix indicating compliance for automotive and other applications requiring unique site and control change requirements. Its 16 kV HBM ESD rating and −65 °C to +150 °C junction temperature range further support deployment in automotive camera modules and infotainment systems.
What is the maximum power dissipation for SZMM5Z39VT1G on a standard FR-4 board?
SZMM5Z39VT1G has a maximum steady-state power dissipation of 500 mW at TA = 25 °C on an FR-4 board with a 1 cm² copper pad. Above 25 °C, it derates linearly at 4.0 mW/°C, reaching zero dissipation at approximately 150 °C ambient-consistent with its 250 °C/W junction-to-ambient thermal resistance.
How does the Zener impedance of SZMM5Z39VT1G affect circuit performance?
SZMM5Z39VT1G exhibits a maximum Zener impedance (ZZT) of 130 Ω at IZT = 1 mA. This value directly impacts regulation accuracy: for every 1 mA change in Zener current, output voltage varies by up to 130 mV. Lower impedance improves stability in precision reference or low-noise biasing applications.
What is the reverse leakage current specification for SZMM5Z39VT1G?
SZMM5Z39VT1G specifies a maximum reverse leakage current (IR) of 0.05 μA at VR = 31.2 V and TA = 25 °C. This ultra-low leakage ensures minimal parasitic loading in high-impedance monitoring circuits, such as battery voltage supervisors or analog sensor bias networks where quiescent current must remain sub-100 nA.
SZMM5Z39VT1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- SZMM5ZxxxT1G
- Package/Case:
- SC-79, SOD-523
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 39 V
- Tolerance:
- ±5.13%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 130 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 27.3 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-523
SZMM5Z39VT1G FAQ
1.How can I place an order for SZMM5Z39VT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMM5Z39VT1G 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 SZMM5Z39VT1G reliable?
The price and inventory of SZMM5Z39VT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMM5Z39VT1G is usually 5 days.
3.What payment methods are accepted for SZMM5Z39VT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMM5Z39VT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMM5Z39VT1G?
SZMM5Z39VT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMM5Z39VT1G 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 SZMM5Z39VT1G?
For technical support, including SZMM5Z39VT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMM5Z39VT1G requirements.
6.How does Aetrix verify that SZMM5Z39VT1G is sourced from the original manufacturer or authorized distributors?
All SZMM5Z39VT1G 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 SZMM5Z39VT1G meets industry standards.
7.What is the process for return or replacement of SZMM5Z39VT1G?
All SZMM5Z39VT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMM5Z39VT1G, 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 SZMM5Z39VT1G part is unused and in its original packaging.
Return procedure for SZMM5Z39VT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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