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onsemi SZMMSZ12T3G
- Part No.:
- SZMMSZ12T3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
SZMMSZ12T3G.pdf
- Description:
- DIODE ZENER 12V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:10,486
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Product details
Overview
SZMMSZ12T3G from onsemi is a 12 V, ±5% tolerance Zener diode in SOD−123 package, rated for 500 mW power dissipation at 75°C, with 25 Ω maximum dynamic impedance at 5 mA and 0.1 μA reverse leakage at 9.1 V, used for precision voltage regulation and overvoltage protection in automotive power rails.
For engineers reviewing the SZMMSZ12T3G datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, thermal derating behavior, AEC−Q101 qualification status, and direct alternatives for automotive-grade voltage reference design.
Technical Context
This device operates as a two-terminal voltage reference using avalanche breakdown in silicon PN junction, with nominal Zener voltage measured under 1 ms pulse conditions at 5 mA test current. Its temperature coefficient is +2.0 mV/°C near 12 V, enabling stable regulation across −55°C to +150°C junction range.
Designed for surface-mount assembly on FR−5 boards, it features Class 3 ESD robustness (>16 kV HBM), Pb−free construction, and cathode polarity marked by band. Thermal resistance is 340°C/W (junction-to-ambient) and 150°C/W (junction-to-lead), defining safe operating area under pulsed and continuous loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 11.4 V min / 12.0 V nom / 12.6 V max at IZT = 5 mA - defines regulated output voltage window under standard test condition |
| Power Dissipation (PD) | 500 mW @ TL = 75°C - sets maximum continuous power handling on FR−5 board before thermal derating applies |
| Zener Impedance (ZZT) | 25 Ω max @ IZT = 5 mA - determines regulation accuracy under load transients and ripple rejection capability |
| Reverse Leakage (IR) | 0.1 μA max @ VR = 9.1 V - ensures minimal standby current in undervoltage clamp or bias networks |
| Thermal Resistance (RJA) | 340°C/W - quantifies junction temperature rise per watt dissipated in still air, critical for PCB layout thermal management |
| ESD Rating | Class 3 (>16 kV) per HBM - confirms robustness against human-body electrostatic discharge during handling and assembly |
| AEC−Q101 Qualified | Yes - validates suitability for automotive electronic control units requiring stress-tested reliability and PPAP documentation |
Pinout & Package
SOD−123 surface-mount plastic package (1.60 × 2.69 × 1.16 mm), void-free thermosetting case with corrosion-resistant finish, cathode indicated by polarity band, UL 94 V−0 flammability rating, and 260°C/10s maximum soldering temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated output node; reverse-biased terminal where Zener breakdown occurs |
| 2 (Unbanded End) | Anode | Connected to ground or lower-potential rail; completes current path during regulation |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC−Q101 qualified and PPAP capable - enables use in engine control, body electronics, and ADAS modules without additional qualification effort |
| Pb−free packaging | SZ prefix indicates automotive-grade site/control change compliance and RoHS-compliant lead finish - supports global environmental compliance requirements |
| High-density mounting | SOD−123 footprint (1.60 × 2.69 mm) - allows placement in space-constrained PCB areas such as sensor signal conditioning or microcontroller power supervision |
| ESD robustness | Class 3 (>16 kV HBM) - eliminates need for external ESD protection in low-energy interface circuits like CAN bus bias networks |
| Stable temperature coefficient | +2.0 mV/°C near 12 V - minimizes drift over automotive temperature range, supporting accurate 12 V rail monitoring and clamping |
Applications
| Automotive Power Rail Clamp | Microcontroller Reset Circuit |
|---|---|
Use Scenario: Clamping transient spikes on 12 V battery-supplied ECUs during load dump or alternator switching events. IC Role / Device Role / Timing Role: Two-terminal passive voltage clamp absorbing surge energy above 12.6 V while limiting downstream voltage excursion. Use Value: Prevents damage to 12 V–rated MCUs and analog front-ends using only 500 mW dissipation and no active control circuitry. | Use Scenario: Generating a clean, temperature-stable reset threshold for automotive microcontrollers powered from switched 12 V rails. IC Role / Device Role / Timing Role: Precision voltage reference feeding comparator input to assert reset when supply drops below 11.4 V. Use Value: Enables reliable cold-cranking detection down to −40°C due to AEC−Q101 validation and +2.0 mV/°C TC matching system requirements. |
| Industrial Sensor Bias Network | USB-C PD Overvoltage Protection |
Use Scenario: Providing stable 12 V bias for analog sensors in factory automation systems exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Low-drift voltage reference establishing excitation voltage for bridge-based pressure or temperature transducers. Use Value: Maintains <±0.5% output stability from −40°C to +125°C, reducing calibration frequency in field-deployed equipment. | Use Scenario: Secondary overvoltage clamp on USB-C power delivery lines to protect Type-C controller ICs during fault conditions. IC Role / Device Role / Timing Role: Fast-reacting shunt regulator triggered when VBUS exceeds 12.6 V, diverting fault current before controller shutdown. Use Value: Adds fail-safe layer with <100 ns response time and 0.1 μA leakage at 9.1 V, preserving system quiescent current budget. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ12T3G | No SZ prefix; commercial grade, not AEC−Q101 qualified; same electrical specs and SOD−123 package | Not approved for automotive production; suitable for industrial or consumer prototypes where qualification is not required | Select when cost sensitivity outweighs automotive compliance needs and lifecycle assurance is not mandated |
| BZX84-C12LT1G | 12 V ±5%, 350 mW rating, SOT−23 package, 40 Ω ZZT, 0.1 μA IR @ 9.1 V | Lower power rating and higher impedance limit use in high-current or low-noise regulation; SOT−23 footprint differs from SOD−123 | Choose only if board space permits SOT−23 and thermal margin allows 350 mW operation |
Compared with MMSZ12T3G and BZX84-C12LT1G, SZMMSZ12T3G uniquely combines AEC−Q101 qualification, 500 mW power handling, and 25 Ω impedance in SOD−123 - making it the sole option for production automotive voltage clamping where reliability, thermal headroom, and regulatory traceability are mandatory.
Availability
SZMMSZ12T3G is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor biasing, and USB-C PD protection circuits requiring stable component supply, long-term lifecycle support, and AEC−Q101 traceability.
Supply support for SZMMSZ12T3G 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 power management, analog, sensing, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
SZMMSZxxxT1G/SZMMSZxxxT3G series was developed specifically for automotive electronics requiring AEC−Q101 qualification, high-reliability Zener regulation, and Pb−free manufacturing compliance - targeting power rail supervision, ECU protection, and sensor interface applications.
FAQ
What is the Zener voltage tolerance of SZMMSZ12T3G?
SZMMSZ12T3G has a nominal Zener voltage of 12.0 V with a standard tolerance of ±5%, resulting in a guaranteed range of 11.4 V to 12.6 V at IZT = 5 mA and TA = 25°C. This tolerance is confirmed in the Electrical Characteristics table on page 2 of the official onsemi datasheet (Rev. 13, June 2024), and applies to all devices in the SZMMSZxxxT1G/T3G family.
Is SZMMSZ12T3G qualified for automotive applications?
Yes, SZMMSZ12T3G is AEC−Q101 qualified and PPAP capable, as explicitly stated in the Features section of the onsemi datasheet. The "SZ" prefix denotes automotive and other applications requiring unique site and control change requirements, distinguishing it from commercial-grade MMSZ12T3G variants. This qualification covers stress testing for temperature cycling, humidity, and mechanical shock.
What is the maximum power dissipation for SZMMSZ12T3G on FR−5 board?
SZMMSZ12T3G is rated for 500 mW total power dissipation on FR−5 board at lead temperature (TL) = 75°C, with thermal derating of 6.7 mW/°C above that temperature. This value is specified in the Maximum Ratings table (page 1) and reflects real-world performance on standard 3.5 × 1.5 inch FR−5 test board per JEDEC JESD51 standards.
Does SZMMSZ12T3G have ESD protection?
Yes, SZMMSZ12T3G has an ESD rating of Class 3 (>16 kV) per Human Body Model (HBM), as documented in the Features section of the onsemi datasheet. This level of robustness is built into the device structure and does not require external components, making it suitable for handling in automated SMT lines and integration into ESD-sensitive subsystems like infotainment interfaces.
What is the thermal resistance junction-to-ambient for SZMMSZ12T3G?
The thermal resistance junction-to-ambient (RJA) for SZMMSZ12T3G is 340°C/W, measured via infrared scan method on FR−5 board, as specified in the Maximum Ratings table. This parameter directly determines junction temperature rise under steady-state operation and must be used with board layout and copper pour data to ensure TJ remains within −55°C to +150°C limits.
SZMMSZ12T3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 12 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 25 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 8 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
SZMMSZ12T3G FAQ
1.How can I place an order for SZMMSZ12T3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMSZ12T3G 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 SZMMSZ12T3G reliable?
The price and inventory of SZMMSZ12T3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMSZ12T3G is usually 5 days.
3.What payment methods are accepted for SZMMSZ12T3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMSZ12T3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMSZ12T3G?
SZMMSZ12T3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMSZ12T3G 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 SZMMSZ12T3G?
For technical support, including SZMMSZ12T3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMSZ12T3G requirements.
6.How does Aetrix verify that SZMMSZ12T3G is sourced from the original manufacturer or authorized distributors?
All SZMMSZ12T3G 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 SZMMSZ12T3G meets industry standards.
7.What is the process for return or replacement of SZMMSZ12T3G?
All SZMMSZ12T3G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMSZ12T3G, 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 SZMMSZ12T3G part is unused and in its original packaging.
Return procedure for SZMMSZ12T3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZMMSZ12T3G Tags
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