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onsemi SZMMSZ4689T3G
- Part No.:
- SZMMSZ4689T3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
SZMMSZ4689T3G.pdf
- Description:
- DIODE ZENER 5.1V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:9,866
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Product details
Overview
SZMMSZ4689T3G from onsemi is a 5.1 V ±5% Zener voltage regulator diode in SOD−123 package, rated for 500 mW power dissipation at 75°C, with 50 µA test current (IZT), 10 µA leakage current at 3 V reverse bias, and ESD rating >16 kV (HBM). It provides precision low-voltage reference and overvoltage protection in space-constrained automotive and industrial power rails.
For engineers reviewing the SZMMSZ4689T3G datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage tolerance, dynamic impedance at 20 mA, temperature coefficient, thermal resistance (RJL = 150 °C/W), and AEC−Q101 qualification status.
Technical Context
This device operates as a two-terminal shunt voltage regulator, maintaining stable output voltage across load variations by conducting reverse current above its specified Zener breakdown threshold. Its low IZT (50 µA) enables efficient regulation in ultra-low-power monitoring circuits.
The SOD−123 package supports automated placement and offers 340 °C/W junction-to-ambient thermal resistance. With a −55 °C to +150 °C operating junction temperature range and Class 3 HBM ESD rating, it meets stringent reliability requirements for automotive body electronics and industrial sensor interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.85–5.36 V @ IZT = 50 µA; ensures ±5% regulation accuracy under light-load conditions |
| Power Dissipation (PD) | 500 mW @ TL = 75°C; derates linearly at 6.7 mW/°C above 75°C for thermal design margin |
| Leakage Current (IR) | 10 µA @ VR = 3 V; guarantees minimal standby power loss in battery-backed systems |
| Dynamic Impedance (ZZT) | Typ. 15 Ω @ IZ = 20 mA; maintains tight voltage stability during transient load steps |
| Temperature Coefficient | ≈+2.5 mV/°C near 5.1 V; enables predictable drift compensation in wide-temperature environments |
| Junction-to-Lead Thermal Resistance | 150 °C/W; supports reliable heat transfer to PCB copper in high-density layouts |
Pinout & Package
SOD−123 surface-mount package: 2-pin, 1.60 × 2.69 × 1.16 mm, cathode marked by band, Pb-free, RoHS compliant, UL 94 V−0 rated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated voltage node; reverse-biased terminal where Zener breakdown occurs |
| 2 (Unbanded End) | Anode | Connected to ground or lower-potential rail; completes shunt regulation path |
Key Features
| Feature | Design Value |
|---|---|
| AEC−Q101 Qualified | Validated for automotive applications including body control modules and lighting drivers |
| ESD Robustness | Class 3 (>16 kV HBM) eliminates need for external ESD protection in exposed I/O lines |
| Low IZT Operation | 50 µA test current enables accurate regulation in microamp-level bias networks |
| Thermal Performance | RJL = 150 °C/W allows direct thermal coupling to PCB copper for sustained 500 mW operation |
Applications
| Automotive Body Control Unit (BCU) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Regulating reference voltage for LIN transceiver biasing and microcontroller I/O protection in door module ECUs. IC Role / Device Role / Timing Role: Shunt voltage clamp and precision 5.1 V reference source. Use Value: Maintains stable logic-level compatibility across battery voltage swings (9–16 V) while surviving load-dump transients per ISO 7637-2. | Use Scenario: Providing stable excitation voltage for bridge-based pressure sensors in factory automation PLC analog input stages. IC Role / Device Role / Timing Role: Low-drift Zener reference for ratiometric ADC front-end calibration. Use Value: Enables <±0.5% full-scale accuracy over −40°C to +125°C due to predictable +2.5 mV/°C TC and low dynamic impedance. |
| USB-C Power Delivery Monitor | Smart Meter Voltage Supervisor |
Use Scenario: Overvoltage detection on VBUS line during USB-C negotiation, triggering fault shutdown before damage occurs. IC Role / Device Role / Timing Role: Fast-acting shunt clamping element with sub-100 ns response to 12 V transients. Use Value: Limits VBUS to ≤5.36 V with <10 µA quiescent leakage, preserving energy efficiency in always-on monitoring circuits. | Use Scenario: Monitoring AC mains-derived DC rail in electricity meters to detect brownout or overvoltage events per IEC 62053-21. IC Role / Device Role / Timing Role: Primary undervoltage/overvoltage threshold detector feeding into microcontroller GPIO. Use Value: Delivers repeatable 4.85–5.36 V trip window with no hysteresis required, simplifying firmware logic and reducing BOM count. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584C5V1 | Same 5.1 V nominal, but SOD-323 package (smaller footprint); higher ZZT (30 Ω typical); not AEC-Q101 qualified | Preferred for consumer wearables where board space is critical and automotive qualification is unnecessary | Select when size trumps qualification and thermal performance is secondary |
| MMSZ5222BT1G | 5.1 V nominal, same SOD-123 package, but only commercial-grade (−55°C to +150°C not guaranteed); RJL = 170 °C/W; no AEC-Q101 or PPAP support | Suitable for cost-sensitive industrial controls without automotive traceability requirements | Choose for non-automotive production where full AEC-Q101 documentation is not mandated |
Compared with BZX584C5V1 and MMSZ5222BT1G, SZMMSZ4689T3G uniquely combines AEC−Q101 qualification, 150 °C/W thermal resistance, and guaranteed −55°C to +150°C operation-making it the only option qualified for under-hood automotive use with validated PPAP capability.
Availability
SZMMSZ4689T3G is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, USB-C power monitors, and smart meter voltage supervisors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SZMMSZ4689T3G 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 is a global semiconductor manufacturer specializing in energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
The SZMMSZ4xxxT3G series is part of onsemi's AEC−Q101-qualified Zener regulator portfolio, engineered specifically for robust voltage reference and overvoltage protection in harsh-environment automotive subsystems and mission-critical industrial controls.
FAQ
What is the nominal Zener voltage and tolerance of SZMMSZ4689T3G?
The SZMMSZ4689T3G has a nominal Zener voltage of 5.1 V with a tolerance of ±5%, corresponding to a guaranteed range of 4.85 V to 5.36 V when tested at IZT = 50 µA and TA = 25°C. This tolerance is fully characterized and verified across the −55°C to +150°C junction temperature range per the official onsemi datasheet revision 13.
Is SZMMSZ4689T3G qualified for automotive applications?
Yes, SZMMSZ4689T3G is AEC−Q101 qualified and PPAP capable. The "SZ" prefix explicitly denotes compliance with automotive-specific site and process controls, and the device is certified for use in body electronics, lighting, and infotainment systems meeting ISO/TS 16949 requirements.
What is the maximum power dissipation and thermal derating behavior of SZMMSZ4689T3G?
SZMMSZ4689T3G is rated for 500 mW total power dissipation on FR−5 board at lead temperature (TL) = 75°C, with linear derating of 6.7 mW/°C above that point. Its junction-to-lead thermal resistance is 150 °C/W, enabling effective heat transfer to PCB copper for sustained operation in thermally constrained designs.
Does SZMMSZ4689T3G have ESD protection, and what level is specified?
Yes, SZMMSZ4689T3G features an ESD rating of Class 3 (>16 kV) per the Human Body Model (HBM), as confirmed in the onsemi datasheet. This eliminates the need for discrete ESD protection devices in many I/O interface applications, reducing BOM count and layout complexity.
What package type and dimensions does SZMMSZ4689T3G use?
SZMMSZ4689T3G uses the SOD−123 surface-mount package (Case 425, Style 1), measuring 1.60 × 2.69 × 1.16 mm. It features a cathode band marking, Pb-free finish, RoHS compliance, and UL 94 V−0 flammability rating-optimized for high-density automated assembly.
SZMMSZ4689T3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 5.1 V
- Tolerance:
- -
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- -
- Current - Reverse Leakage @ Vr:
- 10 µA @ 3 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
SZMMSZ4689T3G FAQ
1.How can I place an order for SZMMSZ4689T3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMSZ4689T3G 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 SZMMSZ4689T3G reliable?
The price and inventory of SZMMSZ4689T3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMSZ4689T3G is usually 5 days.
3.What payment methods are accepted for SZMMSZ4689T3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMSZ4689T3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMSZ4689T3G?
SZMMSZ4689T3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMSZ4689T3G 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 SZMMSZ4689T3G?
For technical support, including SZMMSZ4689T3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMSZ4689T3G requirements.
6.How does Aetrix verify that SZMMSZ4689T3G is sourced from the original manufacturer or authorized distributors?
All SZMMSZ4689T3G 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 SZMMSZ4689T3G meets industry standards.
7.What is the process for return or replacement of SZMMSZ4689T3G?
All SZMMSZ4689T3G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMSZ4689T3G, 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 SZMMSZ4689T3G part is unused and in its original packaging.
Return procedure for SZMMSZ4689T3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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